JP5255192B2 - Epoxy resin composition capable of forming coating film having high elongation rate, anticorrosion coating composition, coating film thereof, base material coated with the coating film, and anticorrosion method for base material - Google Patents

Description

  The present invention relates to an epoxy resin composition capable of forming a coating film having a high elongation rate, an anticorrosive coating composition, a coating film thereof, a substrate coated with the coating film, and a method for preventing corrosion of the substrate.

  Conventionally, anti-corrosion coating has been applied to the surface of base materials such as ships and land / marine steel structures, but the formed anti-corrosion coating is flexible (elongated) as it hardens and dries over time. The coating film becomes brittle, the physical properties are lowered, and it becomes impossible to follow the partial stress strain of the steel material, and the coating film is likely to crack.

  Then, rust is generated from the cracks in the coating film, and the base material such as a steel plate is corroded, causing various problems such as inundation and collapse of a ship or land / ocean structures. In particular, in the shipbuilding industry in recent years, double hulling has been progressing to make the hull a double structure from the viewpoint of preventing marine pollution at the time of tanker damage. In order to suppress the increase in hull weight accompanying this, Steel (high-tensile-strength steel) is often used, and thin steel plates are used.

In ship, land, and marine structures such as water ballast tanks such as crude oil tankers, product carriers, and chemical tankers, lap seam welds, which are welded joints of steel plates, are caused by the stress strain of high-tensile steel. Or, in the welding of T-joints such as steel plates, cracks in the coating film occur in the scallops that are fan-shaped notches provided on one steel plate in order to avoid the thermal effects due to the crossing of the weld lines, Cases in which steel sheets corrode are often reported, and this countermeasure is an important issue.

  In addition, a bulk carrier, an ore / coal carrier, which is a type of ship, sometimes uses a heavy machine such as a bulldozer when lifting or lowering the load. At this time, deformation such as dents and protrusions that are large damage to the tank top part steel plate of the cargo hold (cargo hold), cracks occur in the anticorrosive coating film coated on the water ballast tank below the cargo hold, The steel plate may corrode.

  The inventors of the present invention, when such dents or protrusions occur on a steel plate or the like, the coating film applied on the front and back surfaces of the steel plate smoothly stretches or bends following the deformation of the base steel plate. As a result of intensive studies to obtain a highly flexible (high elongation) anticorrosion coating that does not cause cracks in the coating, surprisingly, (a): epoxy resin, urethane A coating film (anticorrosion coating film) comprising an epoxy resin composition comprising a main component component containing a modified epoxy resin and / or a liquid hydrocarbon resin and a curing agent component comprising a curing agent for epoxy resin, or (b): A coating film (anticorrosion coating film) comprising an epoxy resin composition containing a main agent containing the above epoxy resin and a curing agent component containing a high elasticity imparting amine-based curing agent, (c): epoxy resin, urethane-modified epoxy resin And / or According to a coating film (anticorrosion coating film) made of an epoxy resin composition containing a main component component containing a gaseous hydrocarbon resin and a curing agent component containing a high elasticity-imparting amine curing agent, As a result, the present invention was completed.

In addition, (1): Japanese Patent Application Laid-Open No. 9-263713 discloses (A) an epoxy resin and (B) an amine-based curing agent as anticorrosive paints that do not contain tar and are particularly useful for painting inside ships such as ballast tanks. And (C) an anticorrosive coating composition comprising a hydroxyl group-containing petroleum resin and containing 20 to 500 parts by weight of the hydroxyl group-containing petroleum resin component (C) with respect to 100 parts by weight of the cured resin solid content. As the hydroxyl group-containing petroleum resin (C), it is described that a hydroxyl group-containing petroleum resin having a softening point of 50 to 150 ° C. is preferable.

  Further, according to the anticorrosion coating composition, the compatibility between the cured resin and the petroleum resin is good, there is no problem in safety and hygiene, and the anticorrosion, water resistance and adhesion are good, and a light-colored coating film is formed. It is stated that it can be done. However, the coating film made of the anticorrosive coating composition described in the publication (1) has a problem that flexibility (elongation rate) decreases and physical properties also decrease as drying progresses over time.

Further, (2): Japanese Patent Publication No. 59-2468 added (i) a mercaptan group of a polysulfide resin at a ratio of 0.03 to 0.06 equivalent to 1 equivalent of an epoxy group of the epoxy resin. An epoxy resin anticorrosive coating composition comprising a polysulfide-added epoxy resin and (ii) a curing agent is described. Examples of the curing agent (ii) include aliphatic polyamines, heterocyclic diamines, amine adduct resins, modified polyamines, modified polyamide resins, polyisocyanates, and aromatic polyamines.

However, the coating film made of the epoxy resin anticorrosive coating composition is insufficient because the flexibility (elongation rate) of the coating film decreases with time, and the coating cost is high. was there.
JP-A-9-263713 Japanese Patent Publication No.59-2468

  The present invention is to solve the problems associated with the prior art as described above, and is an epoxy resin composition and an anticorrosive coating composition capable of forming a coating film having high flexibility (high elongation). An object of the present invention is to provide a coating film, a substrate coated with the coating film, and a method for preventing corrosion of the substrate.

  The first epoxy resin composition and anticorrosion coating composition according to the present invention (hereinafter collectively referred to as the first composition) are (Ai) epoxy resin (a1) and urethane-modified epoxy resin (a2). And / or a main component containing a liquid hydrocarbon resin (a3) and a curing agent component containing (Bi) a curing agent for epoxy resin (b1).

  In the present invention, the main component (Ai) preferably includes an epoxy resin (a1), a urethane-modified epoxy resin (a2), and a liquid hydrocarbon resin (a3), more preferably the epoxy resin. It is desirable that (a1) is a bisphenol A type epoxy resin and the liquid hydrocarbon resin (a3) is a liquid phenol-modified hydrocarbon resin.

  In a preferred embodiment of the present invention, the main component (Ai) is 100 parts by weight in total of the solid content of the epoxy resin (a1), the urethane-modified epoxy resin (a2) and the liquid hydrocarbon resin (a3). The epoxy resin (a1) may be contained in an amount of 10 to 100 parts by weight (total amount), preferably 10 to 99.9 parts by weight, more preferably 10 to 98 parts by weight, and particularly preferably 40 to 80 parts by weight. The urethane-modified epoxy resin (a2) may be 0 to 50 parts by weight, preferably 0.1 to 50 parts by weight, more preferably 2 to 50 parts by weight, particularly preferably 5 to 40 parts by weight. It is desirable to include the liquid hydrocarbon resin (a3) in an amount of 0 to 70 parts by weight, preferably 5 to 30 parts by weight.

In the said invention, it is preferable that the hardening | curing agent component (Bi) is contained by 5-200 weight part with respect to 100 weight part of said main ingredient components (Ai). The second epoxy resin composition and the anticorrosion coating composition according to the present invention (hereinafter collectively referred to as the second composition) are (A-ii).
) Epoxy resin (a1) or a hardener component comprising an epoxy resin (a1) and a liquid hydrocarbon resin (a3), and (B-ii) a high elasticity imparting amine-based curing agent (b1-1) And is characterized by containing.

In such a second composition, the high elasticity-imparting amine curing agent (b1-1) is a diaminoalkyl ether of mono- or polyalkylene glycol or a polyamidoamine obtained by modifying it with a polycarboxylic acid. Is preferred. In the second composition according to the present invention, the curing agent component (B-ii) further contains a general-purpose amine curing agent (b1-2) other than the high elasticity imparting amine curing agent (b1-1). And the high elasticity-imparting amine-based curing agent (b1-1) is a diaminoalkyl ether of mono- or polyalkylene glycol or a polyamidoamine obtained by modifying it with a polycarboxylic acid. At least one kind of high elasticity-imparting amine curing agent selected from the above, wherein the general-purpose amine curing agent (b1-2) is selected from the group consisting of polyamidoamines, Mannich-modified aliphatic polyamines, and phenolamine adducts. The at least one general-purpose amine-based curing agent is desirable.

In the 2nd composition which concerns on this invention, it is preferable that the hardening | curing agent component (B-ii) is contained in the quantity of 5-200 weight part with respect to 100 weight part of the said main ingredient (A-ii). Third according to the present invention
The epoxy resin composition and the anticorrosion coating composition (hereinafter also collectively referred to as a third composition) of (A-iii) the epoxy resin (a1), the urethane-modified epoxy resin (a2) and / or the liquid hydrocarbon It is characterized by containing a main ingredient component containing a resin (a3) and a curing agent component containing (B-iii) a high elasticity-imparting amine curing agent (b1-1).

  In the third composition according to the present invention, the main component (A-iii) preferably contains an epoxy resin (a1), a urethane-modified epoxy resin (a2), and a liquid hydrocarbon resin (a3), The epoxy resin (a1) is preferably a bisphenol A type epoxy resin, and the liquid hydrocarbon resin (a3) is preferably a liquid phenol-modified hydrocarbon resin.

  In the third composition according to the present invention, the main component (A-iii) is a solid content (non-volatile) of the epoxy resin (a1), the urethane-modified epoxy resin (a2) and the liquid hydrocarbon resin (a3). The coating film-forming element, the same shall apply hereinafter) The epoxy resin (a1) may be contained in an amount of 10 to 100 parts by weight, preferably 10 to 99.9 parts by weight, more preferably 100 parts by weight in total. May be 10 to 98 parts by weight, particularly preferably 40 to 80 parts by weight, and the urethane-modified epoxy resin (a2) may be 0 to 50 parts by weight, preferably 0.1 to 50 parts by weight, more preferably 2 It is preferable to contain ˜50 parts by weight, particularly preferably 5 to 40 parts by weight, and the liquid hydrocarbon resin (a3) in an amount of 0 to 70 parts by weight, preferably 5 to 30 parts by weight.

  In the 3rd composition concerning this invention, it is preferable that the hardening | curing agent component (B-iii) is contained in the quantity of 5-200 weight part with respect to 100 weight part of said main ingredient components (A-iii). . The coating film which concerns on this invention is formed from the anticorrosion coating composition which consists of said epoxy resin composition, and is a coating film which has a high elongation rate.

The coated substrate according to the present invention is characterized in that the substrate surface is coated with the above-mentioned coating film. The substrate anticorrosion method according to the present invention is characterized in that the substrate surface is coated with the above-mentioned coating film. ADVANTAGE OF THE INVENTION According to this invention, the epoxy resin composition which can form the coating film which has high flexibility (high elongation rate), anticorrosion coating composition, the coating film, the base material coat | covered with the coating film, and a base material An anticorrosion method is provided.

Hereinafter, an epoxy resin composition capable of forming a coating film having high flexibility (high elongation) according to the present invention, an anticorrosion coating composition, a coating film thereof, a substrate coated with the coating film, and a substrate The anticorrosion method will be specifically described.
<First epoxy resin composition and anticorrosion coating composition>
The first epoxy resin composition and anticorrosion coating composition according to the present invention (these are collectively referred to as the first composition, the first invention, etc.) include (A-i) epoxy resin (a1), The main component component containing the urethane-modified epoxy resin (a2) and / or the liquid hydrocarbon resin (a3) and the curing agent component containing (Bi) the epoxy resin curing agent (b1) are contained. In addition to these, the main component (Ai) and the curing agent component (Bi) may contain various components as described later.

This first composition is characterized by being inexpensive and highly flexible.
[Main ingredient component (Ai)]
In the first aspect of the present invention, the main component (Ai) may include an epoxy resin (a1), a urethane-modified epoxy resin (a2), and a liquid hydrocarbon resin (a3). Resin (a1) and urethane-modified epoxy resin (a2) may be included, and epoxy resin (a1) and liquid hydrocarbon resin (a3) may be included.

  In the preferable aspect of this invention, it is preferable that the said main ingredient component (Ai) contains an epoxy resin (a1), a urethane-modified epoxy resin (a2), and a liquid hydrocarbon resin (a3). More preferably, the epoxy resin (a1) is the following bisphenol A type epoxy resin, and the liquid hydrocarbon resin (a3) is a liquid phenol-modified hydrocarbon resin described later.

Hereinafter, the epoxy resin (a1) contained in the main component (Ai), the urethane-modified epoxy resin (a2), and the liquid hydrocarbon resin (a3) will be described in order.
<Epoxy resin (a1)>
Examples of the epoxy resin (a1) contained in the main component (A-i) include non-tar-based epoxies described in JP-A-11-343454, JP-A-10-259351 and the like previously proposed by the applicant of the present application. Resin can be used.

  Examples of the epoxy resin (a1) include polymers or oligomers containing two or more epoxy groups in the molecule, and polymers or oligomers formed by a ring-opening reaction of the epoxy groups. Examples of such epoxy resins include bisphenol type epoxy resins, glycidyl ester type epoxy resins, glycidyl amine type epoxy resins, phenol novolac type epoxy resins, cresol type epoxy resins, dimer acid-modified epoxy resins, aliphatic epoxy resins, and alicyclic groups. Examples thereof include epoxy resins such as epoxy resins and epoxidized oil-based epoxy resins. Among them, bisphenol type epoxy resins are preferable, bisphenol A type and F type epoxy resins are more preferable, and bisphenol A type epoxy resins are particularly preferably used. When a bisphenol type epoxy resin is used, a coating film having excellent adhesion can be formed.

Examples of such an epoxy resin include epichlorohydrin-bisphenol A epoxy resin (bisphenol A diglycidyl ether type); epichlorohydrin-bisphenol AD epoxy resin; epichlorohydrin and bisphenol F (4,4′-methylenebisphenol). An epoxy novolac resin having a structure as described above; an alicyclic epoxy resin obtained by condensation polymerization reaction of 3,4-epoxyphenoxy-3 ′, 4′-epoxyphenylcarboxymethane, etc .; bonded to a benzene ring in an epichlorohydrin-bisphenol A epoxy resin A brominated epoxy resin having a structure in which at least a part of hydrogen atoms are substituted with bromine; an aliphatic epoxy resin having a structure in which epichlorohydrin and an aliphatic dihydric alcohol are reacted; epichlorohydrin and tri (hydroxyl) And a polyfunctional epoxy resin having a structure obtained by condensation polymerization reaction with methane).

  Examples of bisphenol A type epoxy resins that are particularly preferably used include, for example, bisphenol A diglycidyl ether, bisphenol A polypropylene oxide diglycidyl ether, bisphenol A ethylene oxide diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, Examples thereof include polycondensation products such as bisphenol A type diglycidyl ether such as hydrogenated bisphenol A propylene oxide diglycidyl ether.

  In this invention, such an epoxy resin can be used 1 type or in combination of 2 or more types. Thus, when using in combination of 2 or more types of epoxy resins, the said molecular weight of an epoxy resin and an epoxy equivalent show all by the average value. Among such epoxy resins, those which are liquid to solid at normal temperature (temperature of 15 to 25 ° C., the same shall apply hereinafter) are preferred, and the epoxy equivalent is 150 to 1000 g / equiv, preferably 150 to 600 g / equiv. Particularly preferred is 180 to 500 g / equiv.

The average molecular weight of such an epoxy resin is not generally determined depending on the coating curing conditions (eg, normally dry coating or baking coating) of the resulting coating, but the molecular weight is usually 350 to 20,000. The viscosity is 12000-15000 cPs / 25 ° C., and the epoxy equivalent is in the above range. As the typical epoxy resin, in the case of a liquid at room temperature, “Epicoat (R) 828, general name: bisphenol A diglycidyl ether” (manufactured by Shell Co., Ltd., epoxy equivalent 180 to 190, viscosity 12,000 to 15,000 cPs / 25 ° C.), “Epototo (R) YDF-170, generic name: bisphenol F diglycidyl ether” (manufactured by Tohto Kasei Co., Ltd., epoxy equivalent 160-180, viscosity 2,000-5,000 cPs / 25 ° C), "Flep (R) 60" (manufactured by Toraythiol Co., Ltd., epoxy equivalent of about 280, viscosity of about 17,000 cPs / 25 ° C), "Epicoat (R) 828X-90, generic name: bisphenol A diglycidyl ether "Xylene solution" (828 type epoxy resin, manufactured by Shell, epoxy equivalent of about 210), "Epi Coat (R) 834X-85, generic name: bisphenol A type epoxy / xylene solution ”(834 type epoxy resin, Shell Co., epoxy equivalent of about 282),“ Epicoat (R) 1001X-75, generic name: bisphenol A type epoxy / xylene solution ”(1001 type epoxy resin, manufactured by Shell Co., Ltd., epoxy equivalent of about 633), etc., and“ Epototo (R) YD-134 ” , Generic name: bisphenol A type epoxy (manufactured by Tohto Kasei Co., Ltd., epoxy equivalent 230-270), etc., and in the solid form at room temperature, “Epicoat (R) 1001, generic name: bisphenol A-type epoxy ”(manufactured by Shell Co., Ltd., epoxy equivalent of 450 to 500). In the present invention, one or more of these epoxy resins may be contained. In addition, (R) of the above product name indicates a registered trademark or the like.

  In the present invention, together with the above epoxy resin, for example, an epoxy resin other than the above, such as an epoxy equivalent exceeding the above range, can be used in a small amount that does not contradict the purpose of the present invention. In the present invention, the epoxy resin (a1) is usually contained in the main component (Ai) in an amount of 5 to 80% by weight, preferably 5 to 50% by weight, and is contained in the composition of the present invention. Is usually contained in an amount of 5 to 40% by weight, preferably 10 to 30% by weight.

In addition, the epoxy resin (a1) is a solid in a total of 100 parts by weight of the solid content of the epoxy resin (a1), the urethane-modified epoxy resin (a2), and the liquid hydrocarbon resin (a3) in the main component (Ai). The content is preferably 10 to 100 parts by weight, preferably 40 to 80 parts by weight. When the epoxy resin (a1) is contained in such an amount, the resulting epoxy resin composition becomes a composition having a high elongation rate, and the obtained coating film has high flexibility and resistance. There exists a tendency for crack property to become favorable.
<Urethane-modified epoxy resin (a2)>
The urethane-modified epoxy resin (a2) is a resin that has an epoxy group and a urethane bond in the molecule, is reactive, and can impart flexibility to the resulting coating film. Such a urethane-modified epoxy resin Conventionally known ones can be widely used. For example, those described in JP-A-10-278172, JP-A-2001-11365, JP-A-2000-119623, and the like can be used.

  For example, the urethane-modified epoxy resin (a2) is used as the urethane resin-based epoxy resin (a1) as described in JP-A-10-278172 [0053] to [0057]. These can be obtained by reacting the following isocyanate compounds (that is, isocyanate group-containing urethane reactants). The isocyanate compound used (isocyanate group-containing urethane reactant) is an aliphatic, alicyclic, or aromatic compound having at least two isocyanate groups in one molecule, or a compound thereof (collectively, And a compound in which at least two isocyanate groups remain in one molecule after partial reaction with a polyhydric alcohol (polyol).

  Examples of the polyisocyanate include m- or p-phenylene diisocyanate, 2,4- or 2,6-tolylene diisocyanate or p-xylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, and the like. Examples of the polyhydric alcohol include dihydric alcohols such as ethylene glycol and propylene glycol, and polyhydric alcohols such as glycerin, trimethylolpropane, pentaerythritol, sorbitol, and dipentaerythritol.

  In the preparation of a urethane-modified epoxy resin, the epoxy resin and the isocyanate group-containing urethane reactant are sufficiently processed to react at a ratio of 10 to 100 parts by weight of the isocyanate group-containing urethane reactant with respect to 100 parts by weight of the epoxy resin. In addition, a tough film is obtained, excellent adhesion to other layers (coating films), polymerization of the resulting resin is in an appropriate range, viscosity is appropriate, and at the time of film formation This is preferable because the paintability is also good. The reaction between the epoxy resin and the isocyanate group-containing urethane reaction product can be carried out without a catalyst, but a known catalyst such as a tertiary amine or an organic compound can be added as necessary.

  In the present invention, as the urethane-modified epoxy resin (a2), for example, as described in JP 2001-11365 A [0037] to [0038], for example, the unit has 1 to 1 carbon atoms. After reacting four polyalkylene polyols (number of hydroxyl groups in one molecule is 1 to 4) and the above polyisocyanate to obtain a polyurethane, the above epoxy resins such as bisphenol A type epoxy resin and alicyclic epoxy resin ( It can be obtained by further reacting with a1).

For example, what reacted the polyurethane obtained by making polytetramethylene glycol of molecular weight 800 and tolylene diisocyanate react by the equivalent ratio of 1.5: 1, and the bisphenol A type epoxy resin, etc. are mentioned. In the present invention, a urethane-modified epoxy resin modified with polyoxypropylene glycol (PPG) may be used. Specifically, “Epitan (R) E195” manufactured by Dainippon Ink and Chemicals, Asahi Denka Kogyo Co., Ltd. "Adeka Resin (R) EPU78-11" manufactured by the company, etc. are mentioned. This urethane-modified epoxy resin is obtained by, for example, reacting an excess amount of the above polyisocyanate with polyoxypropylene glycol (PPG) having a molecular weight of 300 to 3000 to obtain a urethane prepolymer having a free isocyanate group at the end, and then adding 1 It can be produced by reacting an epoxy resin having at least two hydroxyl groups in the molecule. Further, as urethane-modified epoxy resins that can be used in the present invention, those that have been put on the market are “Ankalet (R) 2364” / manufactured by Air Products, “EPU (R) -80” and “EPU (R) -56” / Asahi Denka Kogyo Co., Ltd. is preferable.

  In the present invention, the epoxy equivalent of the urethane-modified epoxy resin (a2) is preferably in the range of 100 to 5000. When the epoxy equivalent is in such a range, the molecular weight of the resin is moderate, a film having sufficient toughness can be formed, workability and post-coating adhesion are good, and the tough film Tends to be obtained. In the present invention, such urethane-modified epoxy resin (a2) can be used alone or in combination of two or more. As described above, when two or more urethane-modified epoxy resins (a2) are used in combination, the molecular weight and epoxy equivalent of the urethane-modified epoxy resin (a2) are both shown as average values.

Among such urethane-modified epoxy resins (a2), those which are solid to liquid at normal temperature (temperature of 15 to 25 ° C.) are preferable, and the epoxy equivalent is 200 to 2000 g / equiv.
Preferably, 400 to 1500 g / equiv is desirable. Such a urethane-modified epoxy resin (a2) has a viscosity of 2000 to 50000 cPs / 25 ° C., and an epoxy equivalent having the above range is used.

In the present invention, the urethane-modified epoxy resin (a2) is usually contained in the main component (Ai) in an amount of 2 to 50% by weight, preferably 2 to 30% by weight, and the composition of the present invention. It is usually contained in an amount of 2 to 20% by weight, preferably 2 to 10% by weight. Further, in the total 100 parts by weight of the solids (non-volatile coating film forming elements) of the epoxy resin (a1), the urethane-modified epoxy resin (a2) and the liquid hydrocarbon resin (a3) in the main component (Ai) In addition, the urethane-modified epoxy resin (a2) is preferably contained in an amount of 0.1 to 50 parts by weight, more preferably 2 to 50 parts by weight, and particularly preferably 5 to 40 parts by weight as a solid content. Is desirable. When the urethane-modified epoxy resin (a2) is contained in such an amount, the resulting epoxy resin composition becomes a composition having a high elongation rate, and the obtained coating film has a high flexibility. There is a tendency that the coating film has good crack resistance.
<Liquid hydrocarbon resin (a3)>
As the liquid hydrocarbon resin (liquid petroleum resin) (a3), conventionally known ones can be widely used, which is a low-boiling fraction obtained by pyrolyzing naphtha, the main component of which is an aliphatic hydrocarbon. It is a copolymer. The liquid hydrocarbon resin (a3) is composed of, for example, an alicyclic hydrocarbon structural unit and a chain hydrocarbon structural unit as described in JP-A-8-127758 [0005]. A saturated or unsaturated aliphatic hydrocarbon resin as a main component and a liquid one can be used.

Examples of the aliphatic hydrocarbon resin include chain hydrocarbons such as 1,3-pentadiene, isoprene, 2-methyl-1-butene and 2-methyl-2-butene, and alicyclic hydrocarbons such as cyclopentadiene. It is an oligomer obtained by polymerizing mainly C5 fraction of petroleum using a catalyst such as Friedel-Crafts catalyst, and is a liquid resin at room temperature, or a liquid resin at room temperature obtained by further hydrogenation. Is preferred. These liquid aliphatic hydrocarbon resins preferably have a number average molecular weight of 100 to 1,000, more preferably 150 to 500. Moreover, it is preferable to use the unsaturated aliphatic liquid hydrocarbon resin which is not hydrogenated from points, such as the viscosity of the composition obtained, a tack | tuck, and adhesive force. Examples of these aliphatic liquid hydrocarbon resins include commercially available products such as “Marcaclear (R) V, L, H” (manufactured by Maruzen Petrochemical Co., Ltd.). In the present invention, as the liquid hydrocarbon resin (a3), an aromatic petroleum resin such as a polymer of a C9 petroleum fraction mainly containing an aromatic olefin such as styrene, vinyl toluene, isopropenyl toluene, and indene, or Modified products such as phenol modified products, liquid polybutadiene, ethylene copolymer resins (ethylene-vinyl acetate copolymer resins, ethylene-ethyl acrylate copolymer resins, etc.) or modified products thereof, synthetic rubbers (butadiene rubber, isoprene rubber, neoprene) Any of these may be used alone, or liquid to solid may be used in combination with the aliphatic liquid hydrocarbon resin. In the present invention, a copolymerized petroleum resin obtained by copolymerizing the C5 fraction and the C9 fraction, and dienes (cyclopentadiene, 1,3-pentadiene, etc.) in the C5 fraction are partially cyclopolymerized. Aliphatic petroleum resins, resins obtained by hydrogenation of aromatic petroleum resins, alicyclic petroleum resins obtained by polymerizing dicyclopentadiene, etc., which are liquid alone or liquid to solid, It can be used in combination with a liquid hydrocarbon resin. In particular, in the present invention, a liquid phenol-modified hydrocarbon resin is preferably used as the liquid hydrocarbon resin (liquid petroleum resin) (a3).

  Examples of the phenol-modified hydrocarbon resin include, as described in, for example, JP-A-9-268209 [0014] to [0015], JP-A-7-196793 [0012], and the like. The thing which copolymerized diolefin and monoolefin contained in a minute with phenols (phenol compound) is mentioned. More specifically, the phenol-modified hydrocarbon resin is a C5 (aliphatic) petroleum resin made from the C5 fraction of the cracked oil fraction, and a C9 (aromatic) made from the C9 fraction. Petroleum resin, C5 / C9 copolymer petroleum resin, or petroleum resin obtained by adding phenols to dicyclopentadiene resin made from dicyclopentadiene obtained by heat dimerization of cyclopentadiene contained in C5 fraction (Hydrocarbon resin). The phenol-modified petroleum resin preferably used in the present invention is obtained by addition-polymerizing styrene, vinyltoluene, coumarone, indene and the like contained in a petroleum cracked oil fraction with phenols.

  Among these, in particular, a phenol-modified C9 petroleum resin obtained by cationic polymerization of C9 fractions such as diolefin and monoolefin contained in petroleum cracked oil fraction in the presence of a phenol compound is used. Is preferable in terms of workability. As the phenol-modified hydrocarbon resin, those having a hydroxyl value of about 5 to 60, preferably 20 to 60 are desirable. If the hydroxyl value is smaller than this, the modification effect such as adhesiveness is lowered, and if the hydroxyl value is larger than this, the molecular weight tends to be reduced and workability tends to be lowered. In the above range, both adhesiveness and workability are excellent. Tend to be obtained. In order to adjust the hydroxyl value of the phenol-modified C9 petroleum resin within the above range, the amount of phenol compound is usually about 5 to 40 parts by weight, preferably 10 to 30 parts by weight with respect to 100 parts by weight of the C9 fraction. Can be used. As phenols, phenol, cresol, xylenol and the like are used. The phenol content is preferably 5 to 50% by weight in the phenol-modified resin and an average of 1 to 3 added per molecule.

  When the phenol content is less than 5% by weight, the curability is lowered, Tg is low, and the toughness tends to be lowered. When the content exceeds 50% by weight, the water absorption rate of the coating film tends to be increased. . The average molecular weight and the like of such a liquid hydrocarbon resin (a3) are not generally determined depending on the coating curing conditions (eg, normal dry coating or baking coating) of the resulting coating, but the molecular weight is usually 200 And a viscosity of 30 to 10,000 (10,000) cPs / 25 ° C. is used.

As commercially available liquid hydrocarbon resins at room temperature, “Nesiles (R) EPX-L, Nesiles (R) EPX-L2” (above, manufactured by NEVCIN / phenol-modified hydrocarbon resin) , "HILENOL (R) PL-1000S" (Korea KOLON
CHEMICAL / C9 hydrocarbon resin), xylene resin "Nikanol (R) Y-
51 "(Mitsubishi Gas Chemical Co., Ltd./xylene resin). In the present invention, the liquid hydrocarbon resin (a3) is usually contained in the main component (Ai) in an amount of 0 to 70% by weight, preferably 5 to 40% by weight, and the composition of the present invention. It is desirable that it is contained in an amount of usually 0 to 20% by weight, preferably 5 to 20% by weight, more preferably 5 to 10% by weight.

Further, in the total 100 parts by weight of the solids (non-volatile coating film forming elements) of the epoxy resin (a1), the urethane-modified epoxy resin (a2) and the liquid hydrocarbon resin (a3) in the main component (Ai) In addition, the liquid hydrocarbon resin (a3) is desirably contained in an amount of 0 to 70 parts by weight, preferably 5 to 30 parts by weight, as a solid content. When the liquid hydrocarbon resin (a3) is contained in such an amount, the resulting epoxy resin composition becomes a composition having a high elongation rate, and the obtained coating film has a high flexibility. The crack resistance tends to be good.
<Other ingredients that can be blended into the main ingredient>
In addition to the main component epoxy resin (a1), urethane-modified epoxy resin (a2), liquid hydrocarbon resin (a3) and the like, the main component (A-i) usually includes various components that can be blended in paints and the like. It may be included. For example, non-reactive flexibility-imparting resin, reactive diluent, pigment component (eg, extender pigment, colored pigment, rust preventive pigment), adhesion enhancer (eg: silane coupling agent), thermoplastics other than the above Resins, plasticizers, inorganic dehydrating agents (stabilizers), solvents, anti-sagging / anti-settling agents, antifouling agents, and other coating film forming components may be blended.
(I) Non-reactive flexibility-imparting resin In the present invention, a non-reactive flexibility-imparting resin is used as a non-reactive flexibility-imparting resin. A resin, a xylene resin, a chroman indene resin, an indene styrene resin, or the like may be blended and used without departing from the object of the present invention. These non-reactive flexibility-imparting resins may be blended in the main component (Ai) in an amount of 0 to 50% by weight, preferably 5 to 20% by weight. Further, tar may be added to the main agent component (Ai) from the viewpoints of economy and anticorrosion, and in this case, this tar is usually 0 to 50 in the main agent component (Ai). You may blend and use it in the quantity used as a weight%, Preferably it is 5 to 40 weight%.

As what is marketed as said non-reactive flexibility imparting resin, "Neopolymer (R) -E-100", "Neopolymer (R) K-2", which is a petroleum resin solid at room temperature, "Neopolymer (R) K3" (the above is made by Nippon Petrochemical Co., Ltd./C9 hydrocarbon resin), "HILENOL (R) PL-400" (Korea KOLONCHEMICAL / C9 hydrocarbon resin), etc. It is done. These resins have good compatibility with other resins. In the present invention, if flexibility (high elongation) is further taken into consideration, the effect is large when a liquid petroleum resin is added from the solid state. You may mix and use a system resin.
(B) Reactive Diluent A reactive diluent can also contribute to an improvement in the curing acceleration effect at low temperatures. Specific examples of such reactive diluent include phenyl glycidyl ether, alkyl glycidyl ether ( Alkyl group having 1 to 10 carbon atoms, preferably 1 to 5, for example, butyl glycidyl ether), Versatic acid glycidyl ester [R ¹ R ² R ³ C—COO-Gl
y, R ¹ + R ² + R ³ = C8-C10 alkyl group, Gly: glycidyl group], α-olefin epoxide (CH _3- (CH ₂ ) _n -Gly, n = 11-13, Gly: glycidyl group)
1,6-hexanediol diglycidyl ether (Gly-O- (CH ₂ ) ₆ -O-Gly, Gly: the same as above), neopentyl glycol diglycidyl ether (Gly-O-CH ₂ -C (
CH ₃ ) ₂ —CH ₂ —O—Gly, Gly: same as above), trimethylolpropane triglycidyl ether (CH ₃ —CH ₂ —C (CH ₂ —O—Gly) ₃ , Gly: same as above), alkylphenol glycidyl ether [ C1-C10 of an alkyl group, Preferably it is 1-5, for example: methylphenol glycidyl ether, ethylphenol glycidyl ether, propylphenol glycidyl ether] etc. are mentioned. Among these reactive diluents, those containing an epoxy group are preferable. Further, the alkylphenol glycidyl ether has a low viscosity and can exert a diluting effect. This is preferable because the concentration of the component is high, the solvent content is low, and the coating film can be made thick with a small number of coatings, and the pollution can be reduced. These reactive diluents can be used alone or in combination of two or more.

As such a reactive diluent, “NC-513” (alkylated phenol glycidyl ether, manufactured by Cardlite Co., Ltd.) has a particularly low viscosity and has a diluting effect, which can contribute to high solidification of paints and the like. Therefore, it is preferable. Such a reactive diluent is usually contained in the main component (Ai) in an amount of 0.1 to 8% by weight, and 0.1 to 10% by weight in the composition of the present invention. % Is desirable.
(C) Pigment component Examples of the pigment component include extender pigments, colored pigments, rust preventive pigments, and any of organic and inorganic pigments. Examples of organic pigments include carbon black, phthalocyanine blue, and bitumen. It is done. Examples of inorganic pigments are neutral and non-reactive such as titanium white, red rose, yellow red rose, barite powder, silica, tankal, talc, chalk, iron oxide powder, mica, barium sulfate, etc .; zinc white (ZnO, zinc oxide), lead white, red lead, zinc powder, lead oxide powder, and the like that are basic and reactive with the acidic substances in the paint (active pigments). Among the above mica, a high aspect ratio mica having an aspect ratio of 30 to 90 is preferable from the viewpoint of improving the blistering resistance of the coating film and reducing the creep property. As such a high aspect ratio mica, “Szolite” Mica (R) 200HK "(manufactured by Kuraray Co., Ltd., aspect ratio: 40 to 60) is used.

  Various colorants such as dyes may also be included. In particular, high aspect ratio mica, which is one of the pigment components, improves water and corrosion resistance, flex resistance, and the like when used in an amount of usually 5 to 10 parts by weight in 100 parts by weight of the main ingredient (Ai). This is desirable because there is a tendency to obtain a coated film.

Further, the blending amount of the various pigments including the mica varies depending on its use and is not unconditionally determined, but is usually included in the main component (Ai) in an amount of 10 to 75% by weight. There are many cases. Further, it is contained in an amount of about 15 to 75 parts by weight in 100 parts by weight of the solid content in the main ingredient component (Ai), and is contained in an amount of 10 to 70% by weight in the composition of the present invention. Often done. Moreover, it is desirable to adjust the pigment volume% (PVC) in the dry coating film to be, for example, 20 to 50%, and further 30 to 40%.
(D) Adhesion enhancing agent Examples of the adhesion enhancing agent include silane coupling agents.

Among these adhesion strengthening agents, the silane coupling agent usually has two types of functional groups in the same molecule, and can contribute to an improvement in adhesion to an inorganic substrate. For example, the formula: X-Si (OR) _Three
[X: a functional group reactive with an organic substance (for example, an amino group, a vinyl group, an epoxy group, a mercapto group, a halogen group, or a hydrocarbon group containing these groups) An ether bond or the like may be present.) Or an alkyl group, and RO represents a hydrolyzable group (eg, methoxy group, ethoxy group). ]. Specific examples of such silane coupling agents include “KBM (R) 403” (γ-glycidoxypropyltrimethoxysilane, manufactured by Shin-Etsu Chemical Co., Ltd.).

In the case of blending such an adhesion enhancer, the adhesion enhancer is contained in the main component (Ai) in an amount of 0.01 to 1.0% by weight, and the composition of the present invention. It is desirable that the product contains 0.01 to 2.0% by weight, preferably 0.1 to 1.0% by weight, if necessary. When a coating material containing an adhesion enhancer in such an amount in the main component (Ai) or the like is used, a coating film excellent in adhesion, blistering resistance, creep resistance and the like tends to be obtained.
(E) Thermoplastic resin Specific examples of the thermoplastic resin include chlorinated polyolefins such as chlorinated rubber, chlorinated polyethylene, and chlorinated polypropylene; (meth) methyl acrylate copolymers, (meth) acrylic Acrylic resins such as ethyl acrylate copolymers, (meth) propyl acrylate copolymers, (meth) butyl acrylate copolymers, (meth) cyclohexyl cyclohexyl copolymers; vinyl chloride-vinyl acetate Vinyl chloride resins such as copolymers, vinyl chloride-vinyl propionate copolymers, vinyl chloride-isobutyl vinyl ether copolymers, vinyl chloride-isopropyl vinyl ether copolymers, vinyl chloride-ethyl vinyl ether copolymers (vinyl chloride copolymer) Styrene resin; urea aldehyde condensation resin; ketone resin and the like. Such a thermoplastic resin may be contained in the main ingredient component (A-i) in an amount of 0 to 40% by weight, and in the composition of the present invention, 0 to 35% by weight. It may be contained in an amount.
(F) Anti-sagging and anti-settling agent (fading agent)
Anti-sagging and anti-settling agents include organic viscosity Al, Ca, Zn stearate salts, lecithin salts, alkyl sulfonate salts, polyethylene wax, amide wax, hydrogenated castor oil wax, polyamide wax And a mixture of both, synthetic fine powder silica, oxidized polyethylene wax, and the like. Polyamide wax, synthetic fine powder silica, oxidized polyethylene wax, and organic viscosity system are preferably used. Examples of such anti-sagging and anti-settling agents include “Disparon (R) 305” and “Dispalon (R) 4200-20” manufactured by Enomoto Kasei Co., Ltd., “Disparon (R) A630-20X”, "Ito Essential Oil Co., Ltd."
ASAT (R) -250F "and the like are listed on the market.

The anti-sagging / sedimentation agent may be contained in the main ingredient component (A-i) in an amount of, for example, 0.1 to 10% by weight. In the composition of the present invention, for example, It may be contained in an amount of 0.1 to 10% by weight.
(G) Solvent solvents include ketones [(eg, methyl isobutyl ketone (MIBK), methyl ethyl ketone (MEK)), alcohols (eg, butanol, methoxypropanol, isopropyl alcohol (IPA)), aromatic hydrocarbons ( Examples: xylene, toluene), ethylene dichloride, acrylonitrile, ethers (eg, methyl tertiary butyl ether (MTBE), propylene glycol monomethyl ether (PGM)), ester series (eg, butyl acetate) and the like. These solvents are used alone or in combination of two or more.

Although there is no restriction | limiting in particular in the compounding quantity of the said solvent, When coating property etc. are considered, it is 2-40 weight% normally in a main ingredient component (Ai), Preferably it is the quantity of 5-30 weight%. It is desirable that it is contained in the composition of the present invention in a total amount of about 5 to 50% by weight. In the present invention, among the above-mentioned various blending components, adhesion reinforcing agents represented by silane coupling agents, thermoplastic resins, pigments and the like may be contained in the main component (Ai) as described above. Moreover, it may be contained in the following curing agent component (Bi), or may be contained in both the main component (Ai) and the curing agent component (Bi).
[Curing agent component (Bi)]
As a hardening | curing agent component (Bi) used for the 1st composition which concerns on this invention with the said main ingredient component (Ai), the hardening | curing agent (b1) for epoxy resins is mentioned.

  As the curing agent for epoxy resin (b1), those conventionally used for epoxy resins such as phenol resin curing agents, polyamine curing agents, polycarboxylic acid curing agents and the like can be used without particular limitation. Specifically, examples of the phenol resin-based curing agent include phenol novolac resin, bisphenol novolac resin, poly p-vinylphenol, and the like.

The polyamine curing agent may be any of aliphatic, alicyclic, aromatic and heterocyclic. Examples of the aliphatic polyamine compound include alkylene polyamines, polyalkylene polyamines, and other aliphatic polyamines. More specifically, examples of the alkylene polyamine include, for example, the formula: H ₂ N—R ^1- NH ₂ (R ¹ : a divalent hydrocarbon group having 1 to 12 main carbon atoms which may have one or more hydrocarbon group side chains), for example, , Methylenediamine, ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,7-diaminoheptane, 1, 8-Diaminooctane, 1,9-diaminononane, 1,10-diaminodecane and the like are used. As the polyalkylene polyamines, for example, the _{formula: H 2 N- (C m H} 2m NH) n H is represented by (m:: 1 to 10 integer, n 2 to 10, preferably an integer of from 2 to 6) More specifically, for example, diethylenetriamine, dipropylenetriamine, triethylenetetramine, tripropylenetetramine, tetraethylenepentamine, tetrapropylenepentamine, pentaethylenehexamine, nonaethylenedecane, trimethylhexamethylenediamine and the like can be mentioned. .

Examples of other aliphatic polyamines include tetra (aminomethyl) methane, tetrakis (2-aminoethylaminomethyl) methane, 1,3 as described in JP-B-49-48480, column 24, and the like. - bis (2'-aminoethylamino) propane, triethylene - bis (trimethylene) hexamine, bis (3-aminoethyl) amine, bis hexamethylene triamine _{[H 2 n (CH 2)} n NH (CH 2) n NH ₂ , n = 6], and the like.

More specific examples of the alicyclic polyamines include 1,4-cyclohexanediamine, 4,4′-methylenebiscyclohexylamine, 4,4′-isopropylidenebiscyclohexylamine, norbornadiamine, bis ( Aminomethyl) cyclohexane, diaminodicyclohexylmethane, isophoronediamine, mensendiamine (MDA) and the like.

  Aromatic polyamines include bis (aminoalkyl) benzene, bis (aminoalkyl) naphthalene, aromatic polyamine compounds having two or more primary amino groups bonded to the benzene ring, and other aromatic polyamines. Etc.

More specifically, examples of the aromatic polyamines include bis (cyanoethyl) diethylenetriamine, o-xylylenediamine, m-xylylenediamine (MXDA), p-xylylenediamine, phenylenediamine, naphthylenediamine, Diaminodiphenylmethane, diaminodiethylphenylmethane, 2,2-bis (4-aminophenyl) propane, 4,4'-diaminodiphenyl ether, 4,4'-diaminobenzophenone, 4,4'-diaminodiphenyl ether, 4,4'- Diaminodiphenyl sulfone, 2,2'-
Dimethyl-4,4′-diaminodiphenylmethane, 2,4′-diaminobiphenyl, 2,3′-dimethyl-4,4′-diaminobiphenyl, 3,3′-dimethoxy-4,4′-diaminobiphenyl, bis ( Aminomethyl) naphthalene, bis (aminoethyl) naphthalene and the like.

More specifically, examples of the heterocyclic polyamines include N-methylpiperazine [CH ₃ —N (CH ₂ CH ₂ ) ₂ NH], morpholine [HN (CH ₂ CH ₂ ) ₂ O], 1, 4 -Bis- (8-
Aminopropyl) -piperazine, piperazine-1,4-diazacycloheptane, 1- (2′-aminoethylpiperazine), 1- [2 ′-(2 ″ -aminoethylamino) ethyl] piperazine, 1,11- Examples thereof include diazacycloeicosane and 1,15-diazacyclooctacosane.

  Other examples of amine compounds that can be used in the present invention include aromatic amines described in JP-B No. 49-48480, page 12, column 24, line 43 to page 14, column 28, line 25 ( Amine compounds) can also be used.

  Other examples include diethylaminopropylamine and polyetherdiamine. Furthermore, modified products of these polyamines such as polyamides, polyamide amines (polyamide resins), amine adducts with epoxy compounds, Mannich compounds (eg Mannich modified polyamide amines), Michael adducts, ketimines, aldimines, etc. It is done.

Examples of the polycarboxylic acid curing agent include phthalic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, 3,6-endomethylenetetrahydrophthalic anhydride, hexachloroendomethylenetetrahydrophthalic anhydride, methyl-3,6- Examples include endomethylenetetrahydrophthalic anhydride. These curing agent components (B-i) are used alone or in combination of two or more.
Examples of commercially available polyamine curing agents include aliphatic polyamines “ACI Hardener (R) K-39” / PTI Japan Co., Ltd. = IBPTR Japan Co., Ltd.) and polyamide amines “PA-66, PA -29 "/ manufactured by Otake Akira Shin Chemical Co., Ltd.), Mannich modified polyamidoamine" Adeka Hardner (R) EH-342W3 "/ Asahi Denka Kogyo Co., Ltd.), Mannich modified aliphatic polyamine" Sunmide (R) " CX-1154 "(manufactured by Sanwa Chemical Co., Ltd.)," Cardlight (R) NC556X80 "/ Cardlight Co., Ltd.) of phenorcamine adduct, and the like. These curing agent components are N.I. V. When the viscosity is 50 to 100% and the viscosity measured with an E-type viscometer is in the range of 100 to 100,000 cPs (preferably 500 to 10,000 cPs), the handling property and the coating property are excellent.

  In the first invention, the curing agent component (Bi) and the main agent component (Ai) have an equivalent ratio (amine equivalent / epoxy equivalent) of 0.3 to 1.5. The amount is preferably 0.5 to 1.0. In the first aspect of the present invention, the curing agent component (Bi) is 5 to 200 parts by weight, preferably 10 to 40 parts by weight with respect to 100 parts by weight of the main component (Ai). It is preferably included in an amount.

When the curing agent component (B-i) is contained in such an amount with respect to the main agent (A-i), the resulting composition becomes a composition having a high elongation rate, and the cured coating film is highly acceptable. It tends to be a coating film having flexibility and good crack resistance.
<Other components that can be added to the curing agent component >
In the present invention, the curing agent component (B-i) may contain, as an optional component, for example, a curing accelerator that can contribute to adjustment of the curing rate, in particular, acceleration. In addition, the curing agent component (Bi) is a component that can be blended with the main component (Ai) among the above-mentioned various blending components, for example, an adhesion reinforcing agent represented by a silane coupling agent, heat A plastic resin, a pigment, a solvent and the like may be contained. Examples of the curing accelerator include tertiary amines.

Specifically, for example, triethanolamine (N (C ₂ H ₅ OH) ₃ ), dialkylaminoethanol {[CH ₃ (CH ₂ ) _n ] ₂ NCH ₂ OH, n: repetition number}, triethylenediamine [1 , 4-diazacyclo (2,2,2) octane], 2,4,6-tri (dimethylaminomethyl) phenol [C ₆ H ₅ —CH ₂ N (CH ₃ ) ₂ , trade name “Versamine (R) EH30 ", Manufactured by Henkel Hakusui Co., Ltd.], trade name" Ancamin (R) K-54 "(manufactured by Air Products) and the like. These curing accelerators are blended in the composition of the present invention in an amount of 0.1 to 2.0% by weight, if necessary. In many cases, the curing agent component (Bi) used in the present invention usually contains the same solvent as in the case of the main component (Ai).

  Although there is no restriction | limiting in particular in the compounding quantity of the said solvent, When coating property etc. are considered, Usually, 1-30 weight% in a hardening | curing agent component (Bi), Preferably it is 5-20 weight%. Preferably, it is included in the composition of the present invention in an amount of about 5 to 50% by weight as described above.

In order to obtain the composition of the present invention, that is, a composition such as a curable epoxy resin composition, a coating composition, and a heavy anticorrosive coating composition, the main component (Ai) is usually added in an amount of 60 to 90% by weight. In the curing agent component (B-i), the remaining amount, that is, 10 to 40% by weight ((Ai) + (Bi) = 100% by weight), for example, a temperature of 15 to 40 ° C. What is necessary is just to mix | blend below and to stir and mix.
<Second epoxy resin composition and anticorrosion coating composition>
The second epoxy resin composition and anticorrosion coating composition according to the present invention (these are collectively referred to as the second composition, the second invention, etc.) include (A-ii) the epoxy resin (a1). A main agent component containing: (B-ii) a hardener component containing a high elasticity-imparting amine-based hardener (b1-1);
Is contained. This second composition has a feature that it is inexpensive and has appropriate flexibility as compared with the first composition or the third composition described later.

In this 2nd composition, the epoxy resin (a1) which is one of the main ingredient components in a 1st composition is used as an essential component in the said 1st composition, and a hardening | curing agent component As described above, the first high-elasticity amine-based curing agent (b1-1) described below is used in place of the curing agent in the first composition or together with the curing agent in the first composition. This is the same as the composition. Therefore, for example, as the main component (A-ii), the first component
The same as the epoxy resin (a1) in the main component in the composition, that is, a bisphenol A type epoxy resin is preferably used. The main component (A-ii) and the curing agent component (
The blending ratio with B-ii) is the same as in the case of the first composition, and other components, amounts, preparation methods, etc. that can be added and blended are the same as in the case of the first composition. is there.

Hereinafter, characteristics of the second composition or differences from the first composition will be described.
In the second composition, the high elasticity-imparting amine-based curing agent (b1-1) is a diaminoalkyl ether of mono- or polyalkylene glycol (the number of alkylene glycol is 2 to 10, preferably 2 to 5, alkylene group). Are C1 to C10, preferably C1 to C5, and the alkyl group is C1 to C10, preferably C1 to C5) or a polyamidoamine obtained by modifying it with a polycarboxylic acid. Of these high elasticity imparting amine-based curing agents (b1-1), diaminoalkyl ethers of the above mono- or polyalkylene glycols or polyamidoamines obtained by modifying them with polycarboxylic acids are preferably used.

Examples of such polyaminoalkyl ethers of mono- or polyalkylene glycols or further modified with polycarboxylic acids include diethylene glycol diaminopropyl ether (“Ancamine (R) 1922” / Air Products), diethylene glycol diaminopropyl. And polyamidoamines (“Ancamide (R) 910” / Air Products) modified with dimer acid. In the second composition according to the present invention, in addition to the high elasticity-imparting amine curing agent (b1-1), the curing agent component (B-ii) further includes the high elasticity-improving amine system. General-purpose amine-based curing agent (b1-2) other than the curing agent (b1-1), that is, the amine-based curing agent (Bi in the first invention)
) Is preferably included.

  In a further preferred embodiment of the present invention, the high elasticity-imparting amine curing agent (b1-1) is selected from the group consisting of diaminoalkyl ethers of mono- or polyalkylene glycols or polyamidoamines modified with polycarboxylic acids. The above-mentioned general-purpose amine-based curing agent (b1-2), that is, the epoxy resin curing agent (b1) in the first invention is used as a polyamidoamine. It is desirable to use at least one general-purpose amine-based curing agent selected from the group consisting of Mannich-modified aliphatic polyamines and phenorcamine adducts.

Thus, as the curing agent component (B-ii), a high elasticity imparting amine curing agent (b1-1),
When used in combination with other general-purpose amine curing agent (b1-2) (that is, curing agent (Bi)), 1 part by weight of high elasticity-imparting amine curing agent (b1-1) is used. On the other hand, the other general-purpose amine-based curing agent (b1-2) is preferably used in an amount of 0.1 to 10 parts by weight. When the high elasticity-imparting amine curing agent (b1-1) and other general-purpose amine curing agent (b1-2) are used in combination in such an amount ratio, the resulting coating film is anticorrosive. It has excellent and moderate flexibility (coating rate of coating film) and bending resistance, and tends to be economically low cost.

In the present invention, the curing agent component (B-ii) is prepared by mixing the component (b1-1) and the component (b1-2) with respect to 100 parts by weight of the component (b1-1). b1-2) may be usually stirred and mixed at a temperature of 15 to 40 ° C. in an amount of 5 to 200 parts by weight, preferably 20 to 100 parts by weight.

Moreover, also in this 2nd composition, like the compounding ratio of the main ingredient component and hardening | curing agent component in the said 1st composition, with respect to 100 weight part of said main ingredient components (A-ii), a hardening | curing agent component ( B-ii) is preferably included in an amount of 5 to 200 parts by weight.
<Third epoxy resin composition and anticorrosion coating composition>
The third epoxy resin composition and the anticorrosion coating composition according to the present invention (hereinafter collectively referred to as the third composition, the third invention, etc.) include (A-iii) the epoxy resin (a1). , A main agent component containing a urethane-modified epoxy resin (a2) and / or a liquid hydrocarbon resin (a3), and (B-iii) a curing agent component containing the high elasticity-imparting amine curing agent (b1-1), Is contained. The third composition is characterized by having a particularly high elongation and excellent crack resistance as compared with the first composition or the second composition.

  In the third composition, as the curing agent component (B-iii) in the first composition, the same highly elastic amine-based curing agent (b1-1) as the curing agent in the second composition is used. ) Is the same as the first composition, except that Therefore, for example, the main component (A-iii) is the same as the main component (A-i) in the first composition, and the main component (A-iii) and the curing agent component (B). The blending ratio with -iii) is the same as in the case of the first composition, and other components and preparation methods that can be added and blended are the same as in the case of the first composition.

Hereinafter, characteristics of the third composition or differences from the first or second composition will be described.
Also in the third composition according to the present invention, as in the case of the first composition, the main ingredient component (A-iii) is an epoxy resin (a1), a urethane-modified epoxy resin (a2), and a liquid carbonization. It is preferable that a hydrogen resin (a3) is included. Furthermore, the epoxy resin (a1) is a bisphenol A type epoxy resin, and the liquid hydrocarbon resin (a3) is a liquid phenol-modified hydrocarbon resin. desirable.

  In the third composition according to the present invention, similar to the main component in the first composition, the main component (A-iii) comprises an epoxy resin (a1), a urethane-modified epoxy resin (a2), and a liquid carbonization. The epoxy resin (a1) is 10 to 100 parts by weight, preferably 40 to 80 parts by weight, and the urethane-modified epoxy resin (a2) is 2 to 50 parts per 100 parts by weight of the total solid content of the hydrogen resin (a3). It is preferred to contain parts by weight, preferably 5-30 parts by weight, and liquid hydrocarbon resin (a3) in an amount of 0-70 parts by weight, preferably 5-20 parts by weight.

Also in this third composition, as with the mixing ratio of the main component and the curing agent component in the first composition, the curing agent component (A-iii) is added to 100 parts by weight of the main component (A-iii). B-iii) is preferably included in an amount of 5 to 200 parts by weight.
<Preparation of composition, coating film, coating substrate, anticorrosion method, etc.>
In order to obtain the composition of the present invention as described above, that is, a composition such as a curable epoxy resin composition, a coating composition, and an anticorrosion coating composition, the main component (Ai), (A-ii) or (A-iii
) The curing agent component (B-i), (B-ii) or (B-iii) is usually 5 to 200 parts by weight, preferably 10 to 40 parts by weight with respect to 100 parts by weight. What is necessary is just to mix | blend at the temperature of 15-40 degreeC, and to stir and mix.

The main component (A-i), (A-ii) or (A-iii) of each of the above inventions may be collectively referred to as the main component (A) or the like. -i), (B-ii) or (B-iii) may be collectively referred to as a curing agent component (B) or the like.

  According to such a composition according to the present invention, adhesion to a sandblasted steel sheet, inorganic / organic zinc shop primer-treated steel sheet, break elongation, break value, initial physical properties (adhesion, flexibility) , Impact resistance and pencil hardness), anticorrosion test (temperature difference test, salt water immersion, cathodic protection, salt spray, high temperature and high humidity) can be formed in a well-balanced and excellent coating film. That is, the coating film according to the present invention is formed from the anticorrosion coating composition comprising the above epoxy resin composition, has high flexibility and high elongation, and can follow the stress strain of the substrate and the like well. .

  Moreover, as described above, the coated substrate according to the present invention has the substrate surface coated with the coating film of the present invention. Therefore, in the coated substrate, the coating film can be deformed following the stress strain of the substrate such as a steel plate, cracks are hardly generated in the coating film, and the coating film has high flexibility and high elongation. The coated substrate is excellent in corrosion resistance.

  The substrate anticorrosion method according to the present invention is characterized in that the substrate surface is coated with the above-mentioned coating film. According to the anticorrosion method and the like of the present invention, a coating film that has high flexibility (high elongation rate) and can follow stress strain on a substrate or the like is low cost on the surface of the base material, and is excellent in environmental safety. A coating film can be formed.

  In addition, since the composition of the present invention can form a coating film with excellent performance as described above on the surface of the base material, the inner and outer surfaces of the land metal tank, the concrete underground drainage tank, the land, the ground, It can also be used as a top coat for underwater pipelines, but it can be used for ships, fishing materials (eg, ropes, fishing nets, floats, buoys), underwater structures such as water and water outlets for thermal and nuclear power plants, bay roads, and submarine tunnels. It can be used more suitably by coating and curing it on the surface of various base materials such as sludge diffusion prevention membranes for various civil engineering works such as harbor facilities, canals and waterways. The composition of the present invention is suitable as a heavy-duty anticorrosive paint, and particularly for marine tanks (eg, for ballast tanks, cargo oil tanks), marine outer plates, decks, cargo holds, underwater structures, etc. It is suitably used for applications.

In addition, the composition of the present invention can be poured into a mold or the like to be cured by reaction and used as various anticorrosive molded articles such as boats and fishing gears (eg, floating). When the composition of the present invention is applied, dried, and cured, for example, the epoxy group in the epoxy resin contained in the main component (A) is ring-opened, and the epoxy oxygen (O) is a hydroxyl group (—OH). ), And the carbon at the end of the molecule forming the epoxy group reacts with the amino group “—NH ₂ ” and the like in the curing agent,
It is presumed that it is bonded to the curing agent by “—NH—” bond or the like.
[Effect of the invention]
(a) According to the composition of the present invention, it is possible to provide a flexible two-pack type epoxy-based heavy duty anticorrosion paint that can sufficiently follow the stress and strain of steel plates such as ships and land / marine steel structures. .

(b) Moreover, by using the composition of this invention, it becomes difficult to produce a crack in the coating film obtained.
(c) Further, according to the present invention, flexibility can be arbitrarily adjusted depending on the use, and the composition of the present invention is based on an existing epoxy heavy-duty anticorrosive paint and contains specific components. By doing so, since a highly flexible coating film can be obtained easily, an inexpensive anticorrosion paint can be provided without impairing the anticorrosion performance of the existing anticorrosion paint.

(d) According to the composition of the present invention, since the obtained coating film has excellent flexibility (flexibility), it can be expected to be used as a coating for non-ferrous metals, a coating for non-metals, and the like.
(e) The composition of the present invention is described in "Corrosion Protection of ships (July 1996) Guideline No.8 Appendix 2" issued by DNV (Norwegian Classification Society). It is possible to sufficiently respond to the requirement that “an anticorrosive paint having a tensile elongation of 4% or more (of the obtained coating film) is used”.

(f) Conventional anticorrosion paints (eg tar epoxy resin paints, pure epoxy resin paints, modified epoxy resin paints, high solid epoxy resin paints, solventless epoxy resin paints, etc.) are initially cured (room temperature 20 ° C. × 7 10 days) shows sufficient flexibility (elongation 2-15% by tensile test, refraction resistance JIS K-5400, 8.1, etc.), but complete curing (room temperature 20 ° C. ×
After 1 to 3 months, room temperature 20 ° C. × 7 days + 80 ° C. × 4 hours, etc.), the elongation decreases and finally decreases to around 1%. In addition, the bending resistance also decreases in proportion thereto. That is, the conventional anticorrosion coating film becomes fragile with time and tends to be unable to follow the stress and strain of the steel sheet.

In contrast, in the composition according to the present invention,
(A): A urethane-modified epoxy resin and / or liquid carbonization that is a special flexibility-imparting resin on the main agent side based on a bisphenol A type epoxy resin (epoxy equivalent 150 to 1000) in an existing epoxy anticorrosive coating Add hydrogen resin,
(B): Add a special amine curing agent that can give high elasticity to the resulting coating film on the side of the general amine curing agent for anticorrosion coatings, or
(C): Consists of the combination of (a) and (b) above,
According to such a composition (coating material, anticorrosive coating material) of the present invention, sufficient anticorrosion properties of existing anticorrosive coating materials are not impaired, and only after the combination and addition amount are adjusted, sufficient after complete curing. It can maintain flexibility (breaking elongation of 1% to 80% by tensile test, 4 to 20% in a practical range), can form a coating film with sufficient bending resistance and good anticorrosion properties, and The composition is inexpensive, and thus the resulting coating film is also inexpensive and excellent in economic efficiency.
[Example]
Hereinafter, the epoxy resin composition, the coating composition, the anticorrosive coating composition, the coating film thereof, and the like according to the present invention will be described more specifically based on examples, but the present invention is not limited in any way by such examples. It is not something.

The test methods used in the following examples and comparative examples are as follows. Moreover, in an Example, a comparative example, etc., unless it is contrary to the meaning, the compounding composition of each component is a weight part display. (1) Measurement of tensile test breaking elongation (%) and breaking value (kgf / cm ² ) The breaking elongation of the test piece was measured according to “JIS K-7113”. As a test piece, a free film of 20 mm × 10 mm was prepared as follows, and using a Tensilon tester, the elongation at break (%) and the breaking value at that time (kgf / cm ² ) It was measured.

  The test piece was prepared by coating a Teflon (registered trademark) sheet or release paper with an air spray or an applicator so as to have a uniform film thickness (DFT 200 μm). The coated test piece was dried at room temperature (20 ° C.) for 1 day and cut into a prescribed size to prepare a free film.

Furthermore, when these free films are naturally dried for 14 days at room temperature (20 ° C.), (b) when naturally dried for 1 month at room temperature (20 ° C.), and (c) 7 at room temperature (20 ° C.). After natural drying for days, it was further dried in 3 modes in the case of forced drying (complete curing) at 80 ° C. for 4 hours. About each obtained dry test piece, the breaking elongation and the breaking value were measured.
(2) Initial physical properties and evaluation
(A) As a coating film appearance test method and an evaluation standard test method, first, a sandblasted steel plate (70 mm × 150 mm × 2.3 mm (thickness), manufactured by Taiho Equipment Co., Ltd.) and a sandblasted steel plate having the same dimensions as this are used. Heat-resistant inorganic zinc shop primer “Celabest (trade name), made by China Paint Co., Ltd.” is coated with DFT (dry coating thickness) to 15 μm and exposed to the outdoors for more than a week (14 days) A dried specimen material (W / B) was prepared. Each test specimen was applied to these test specimen materials by air spray so that the dry film thickness was 180 to 200 μm, and dried at room temperature (20 ° C.) for 7 days to obtain test specimens. (* 1)
<Evaluation criteria>
4: Good,
3: Practical level,
2: Slightly inferior,
1: Defect.
(B) [Adhesion]
(A) The test method of the cross cut test and the preparation method of the evaluation reference specimen are the same as (* 1) of (b) in (b) above.

The test method was based on the “cross-cut tape method” of “JIS K-5400 8.5.2”, creating 25 squares with a width of 2 mm, and expressing the number of residual squares in the adhesion test.
<Evaluation criteria>
4: Each cut is thin and both ends are smooth, the cut intersection and the square are not peeled off at a glance, and the area of the defect is within 5% of the total square area.

3: There is peeling at both sides of the cut and the intersection, and the area of the defect is 5 to 15% of the total square area.
2: The width | variety of peeling of a cut is wide, and the area of a defect | deletion part is 15 to 35% of a total square area.

1: The width of peeling of the cut is wider than “Evaluation: 2”, and the area of the defect portion is 35% or more of the total square area.
(B) The test method of the knife test and the preparation method of the evaluation reference specimen are the same as (* 1) of (b) in (b) above.

The test method was implemented according to "X cut tape method" of JIS K-5400 8.5.3.
<Evaluation criteria>
4: No peeling at all. (Good)
3: There is no peeling at the intersection, and there is a slight peeling at the X-cut portion. (Practical level)
2: There is peeling within 3 mm in any direction from the intersection of the X cut portions. (Slightly inferior)
1: Most of the X-cut portion where the tape is applied is peeled off. (Bad)
(C) The test method of the pull-off test and the method of creating the evaluation standard test piece are the same as (* 1) of (b) in (b) above.

The test method was carried out according to “Adhesion strength” of JIS K-5400 8.7. In a tensile strength test using a pull-off gauge manufactured by Motofuji Corporation, the following evaluation was made based on the peeled site and the peeled area%.
Evaluation criteria

(D) Overall evaluation 4: Good,
3: Practical level,
2: Slightly inferior,
1: Defect.
(C) Flexibility In accordance with JIS K-5400 8.1, a test was conducted using a 10 mm mandrel.
<Evaluation method>
4: There is no crack even when viewed with a loupe.

3: Slight microcracks are observed when viewed with a magnifying glass.
2: A small crack is recognized with the naked eye.
1: Large cracks are recognized and the number is large.
(D) The method for preparing the impact resistance test piece is the same as (* 1) in (b) above (2).

Conforms to JIS K-5400 8.3.2 (DuPont type, 1 kg x 50 cm).
<Evaluation method>
4: The peeling width from the hit part (diameter of about 5 mm) of the hitting core is within 1 mm.

3: The peeling width from the hit part (diameter of about 5 mm) of the hitting core exceeds 1 mm and is within 2 mm.
2: The width of peeling from the hitting part (diameter of about 5 mm) exceeds 2 mm and is within 5 mm.
1: The peeling width from the hitting part (diameter of about 5 mm) exceeds 5 mm.
(E) According to the pencil hardness test method and evaluation standard “JISK-5400 8.4”, an applicator is used on a tin plate with a thickness of 250 μm (
Dry film thickness) and dry at 20 ° C for 7 days or at 20 ° C for 3 months (30 days). Expressed in
(3) Corrosion protection
(A) The temperature difference test, the coating film appearance evaluation method, and the method for creating the evaluation reference test piece are the same as (* 1) in (A) above (2).

The test method was based on “JIS K 5400 8.23”.
The test specimen was given a temperature difference of 30 ° C. so that the test coating surface was in contact with hot water of 50 ° C. and the back surface was in contact with water of 20 ° C., and the coating film appearance and adhesion after 6 days were evaluated.
<Evaluation criteria>
4: Good.

3: Practical level.
2: Slightly inferior
1: Defect.
(B) The salt water resistance test method and the evaluation standard test piece preparation method are the same as (* 1) in (b) (b) above.

The test method was based on “JIS K 5400 8.23”.
The soaking period is 40 ° C salt water x 3 months. The evaluation criteria are the same as (3) (A).
(C) The test method for the anticorrosion property and the method for preparing the evaluation standard test piece are the same as (* 1) in (a) in (2) above.

The test method was based on “ASTM G-8”.
The soaking period is 40 ° C salt water x 3 months. The evaluation criteria are the same as (3) (A).
(D) As a salt spray test method and an evaluation standard test method, a “soft polished steel plate (70 mm × 150 mm × 1 mm (thickness)), manufactured by Otsugi Equipment Co., Ltd.” was used for each test piece material sufficiently degreased with xylene. The test paint was applied by air spray so that the dry film thickness was 180 to 200 μm, and dried at room temperature (20 ° C.) for 7 days to obtain a test specimen. (* 2)
The test method was based on “JIS K-5400 9.1”. The immersion conditions are 35 ° C./5% salt water × 2000 hours.

The evaluation criteria are the same as (3) (A).
(E) The high-temperature and high-humidity test method and the method for preparing the evaluation standard test piece are the same as (* 1) in (b) (b) above.

The test method was based on “JIS K-5400 9.2”. Test conditions are 50 ° C./95% RH or more × 3 months.
The evaluation criteria are the same as (3) (A). Each component used in the following Examples and Comparative Examples is shown below.
(1) "Epicoat 828X-90"
(Type of epoxy resin: bisphenol A diglycidyl ether, manufactured by Shell Co., Ltd.), general name: # 828 type base (high solid type): high solid (solventless type) with high volume solid and 70% or more.
(2) "Epicoat 834X-85"
(Type of epoxy resin: bisphenol A epoxy, manufactured by Shell Co., Ltd.), General name: # 834 / # 1001 Epoxy type base: Volume solvent is about 50 with ordinary solvent-based paint
~ 70%.
(3) "Epicoat 1001X-75"
(Type of epoxy resin: bisphenol A type epoxy, manufactured by Otake Akira Shin Chemical Co., Ltd.), General name: # 1001 Epoxy type base: Volume solvent is about 50 to 70% with a normal solvent type paint.
(4) “Ancarez 2364”
Urethane-modified epoxy resin, manufactured by AIR PRODUCTS, epoxy equivalent 470, viscosity 23,000-35000 cPs / 25 ° C.
(5) “NeciresEPX-L”
Petroleum resin, manufactured by NEVCIN, molecular weight 290, phenol-modified aromatic hydrocarbon resin.
(6) “Neopolymer K2”
C9 petroleum resin, manufactured by Nisseki Chemical Co., Ltd.
(7) "KBM403"
(Silane coupling agent, manufactured by Shin-Etsu Chemical Co., Ltd.)
(8) “F-2 Talc”
(Talc, manufactured by Fuji Talc Co., Ltd.)
(9) "Thiona RCL-575"
(Titanium dioxide, manufactured by SCM)
(10) "Carbon black MA-100"
(Carbon black, manufactured by Mitsubishi Chemical Corporation)
(11) "Suzolite Mica 200HK"
(High aspect ratio mica, aspect ratio 50, manufactured by Kuraray Co., Ltd.)
(12) "ASAT-250F"
(Sag stopper, manufactured by Ito Oil Co., Ltd.)
(13) "Rakkamide TD966"
(Polyamide amine, manufactured by Dainippon Ink & Chemicals, Inc.)
(14) "Adeka Hardener EH342W3"
(MXDA Mannich modified polyamide polyamine, manufactured by Asahi Denka Kogyo Co., Ltd.)
(15) "Sunmide CX1154"
(Partially phenorcamine-modified MXDA Mannich polyamine, manufactured by Sanwa Chemical Co., Ltd.)
(16) "Ancamide 910"
(Polyamideamine, manufactured by AIR PRODUCTS)
(17) "ACI Hardener K-39"
(Aliphatic polyamine, manufactured by PTI Japan)
(18) "Ankamine K-54"
(Tertiary amine, manufactured by AIR PRODUCTS)
(19) Propylene glycol monomethyl ether (PGM, solvent, manufactured by Daicel Chemical Industries, Ltd.)
[Example 1]
<Preparation of main component>
"Epicoat 828X-90" (kind of epoxy resin: bisphenol A type epoxy, manufactured by Shell Co., Ltd.) 0 parts by weight,
"Epicoat 834X-85" (type of epoxy resin: bisphenol A type epoxy, viscosity: 2000 to 4000 cPs, manufactured by Shell Co., Ltd.) 11.3 parts by weight,
7.4 parts by weight of “Epicoat 1001X-75” (type of epoxy resin: bisphenol A type epoxy, manufactured by Shell Co., Ltd.)
"Ancarez 2364" (urethane-modified epoxy resin, AIR PRODUCTS
Made by the company, epoxy equivalent 470, viscosity 23,000-35000 cPs / 25 ° C.) 0 parts by weight,
"NeciresEPX-L" (petroleum resin, manufactured by NEVCIN, molecular weight 290, phenol-modified aromatic hydrocarbon resin), 0 parts by weight,
10.8 parts by weight of “Neopolymer K2” (petroleum resin, manufactured by Nisseki Chemical Co., Ltd.)
"KBM403" (silane coupling agent, manufactured by Shin-Etsu Chemical Co., Ltd.) 0.5 parts by weight,
“F-2 talc” (talc, manufactured by Fuji Talc Co., Ltd.) 41.7 parts by weight,
5.9 parts by weight of “Thiona RCL-575” (titanium dioxide, manufactured by SCM),
"Carbon black MA-100" (carbon black, manufactured by Mitsubishi Chemical Corporation) 0.05 parts by weight;
"Suzolite Mica 200HK" (high aspect ratio mica, aspect ratio 50, manufactured by Kuraray Co., Ltd.) 0 parts by weight,
2.0 parts by weight of “ASAT-250F” (sag stopper, manufactured by Ito Oil Co., Ltd.)
13.4 parts by weight of solvent xylene,
Methyl isobutyl ketone (MIBK) 5.0 parts by weight;
1.0 parts by weight of methyl ethyl ketone (MEK),
0 parts by weight of propylene glycol monomethyl ether (PGM),
A main ingredient component was prepared by mixing and stirring a mixture of 1.0 part by weight of normal butanol (n-BuOH) (total 100 parts by weight).
<Preparation of curing agent component>
"Racamamide TD966" (polyamidoamine, manufactured by Otake Akira Shin Chemical Co., Ltd.) 0 parts by weight,
"Adeka Hardener EH342W3" (MXDA Mannich modified polyamide polyamine, manufactured by Asahi Denka Kogyo Co., Ltd.) 0 parts by weight,
0 parts by weight of “sanmide CX1154” (partially phenorcamine-modified MXDA Mannich polyamine, manufactured by Sanwa Chemical Co., Ltd.)
"Ancamide 910" (polyamidoamine, manufactured by AIR PRODUCTS) 8.5 parts by weight,
"ACI Hardener K-39" (aliphatic polyamine, manufactured by PTI Japan Co., Ltd.) 0 parts by weight,
0.4 part by weight of “Ankamine K-54” (tertiary amine, manufactured by AIR PRODUCTS),
0 part by weight of normal butanol (n-BuOH),
1.2 parts by weight of isobutanol (i-BuOH);
2.1 parts by weight of xylene;
0 part by weight of propylene glycol monomethyl ether (PGM, solvent, manufactured by Daicel Chemical Industries, Ltd.)
A curing agent component was prepared by mixing and stirring a blend of 0 parts by weight of methyl isobutyl ketone (MIBK) (total of 12.2 parts by weight).
<Preparation of curable epoxy resin composition (coating composition, antifouling coating composition)>
100 parts by weight of the main component and 12.2 parts by weight of the curing agent component were mixed to prepare a curable epoxy resin composition (coating composition, antifouling coating composition).

Using the composition, various tests were performed under the above conditions. The blending composition is shown in Tables 2-3. The results are shown in Tables 5-8. Further, Table 4 shows the trade names, general names, and manufacturers (or distributors) of main used raw materials.
[Examples 2 to 12, Comparative Examples 1 and 2]
In Example 1, a composition was prepared and tested in the same manner as in Example 1 except that the component composition and the blending amount thereof were changed as shown in Tables 2 and 3, respectively. The blending composition is shown in Tables 2-3. The results are shown in Tables 5-8.

Claims (10)

(A-ii) The main agent containing the epoxy resin (a1) and the liquid phenol-modified hydrocarbon resin (a3 ) and not containing the urethane-modified epoxy resin (a2) (however, the above-mentioned (a3) with respect to 100% by weight of the main agent) Is 5 to 40% by weight.)
(B-ii) mono- or polyalkylene glycol di aminoalkyl ether (alkylene glycols number of the polyalkylene glycol is a is 2-10) at least one amine which was Barre polyamidoamine or al election modified with a polycarboxylic acid An epoxy resin composition containing a curing agent component containing a curing agent (b1-1) in an amount of 5 to 200 parts by weight of the curing agent component (B-ii) with respect to 100 parts by weight of the main agent (A-ii). An anticorrosion paint composition comprising a material,
Breakage measured in accordance with JIS K-7113 of a completely cured coating film that was naturally dried at room temperature (20 ° C.) for 7 days and further dried at 80 ° C. for 4 hours. An anticorrosive coating composition having an elongation of 4 to 20%.   The main agent (A-ii) is a non-reactive flexibility imparting resin, a reactive diluent, a pigment component, an adhesion reinforcing agent, a thermoplastic resin, a plasticizer, an inorganic dehydrating agent, a solvent, an anti-sagging / anti-settling agent. And at least one component selected from the group consisting of an antifouling agent.   The anticorrosion coating composition according to claim 1 or 2, wherein the curing agent component (B-ii) further contains a general-purpose amine curing agent (b1-2) other than the amine curing agent (b1-1). .   The general-purpose amine-based curing agent (b1-2) is at least one general-purpose selected from the group consisting of a polyamide amine other than the amine-based curing agent (b1-1), a Mannich-modified aliphatic polyamine, and a phenolamine adduct. The anticorrosion coating composition according to claim 3, which is an amine-based curing agent.   The anticorrosion according to claim 3 or 4, wherein the general-purpose amine-based curing agent (b1-2) is used in an amount of 0.1 to 10 parts by weight with respect to 1 part by weight of the amine-based curing agent (b1-1). Paint composition.   The anticorrosion coating composition according to any one of claims 1 to 5, wherein the epoxy resin (a1) is a bisphenol A type epoxy resin.   The anticorrosion paint composition according to any one of claims 1 to 6, wherein the anticorrosion paint composition is used for a water ballast tank of a ship.   A coating film formed from the anticorrosion coating composition according to any one of claims 1 to 7, wherein the coating film is naturally dried at room temperature (20 ° C) for 7 days and further dried at 80 ° C for 4 hours. The coating film whose breaking elongation measured according to JIS K-7113 of a cured coating film is 4 to 20%.   A coated substrate, the substrate surface of which is coated with the coating film according to claim 8.   An anticorrosion method comprising coating the surface of a substrate with the coating film according to claim 8.