JP2003128479A - Primer composition for cement and method for paving - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a primer composition for cement which shows a sufficient adhesion property even if applied to the wet surface of waterich cement, and a method in which the primer composition for the cement is used for paving. SOLUTION: The primer composition for the cement contains a polyurethane resin and alumina powder. The primer composition is applied on the wet surface of the cement base material and thereafter paving is applied on it. The primer composition for the cement base material has sufficient adhesion properties between the cement base material and the paving, even if applied on the wet surface with a high water content. Therefore, the paving method can reduce drying time of the wet surface, save labor for it, and thus carry out the good paving of the cement base material in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primer composition for a cement base material and a paving method, and more specifically, it is used as a primer for a paving material for paving a cement base material such as a floor or a road made of concrete or mortar. The present invention relates to a primer composition for cement base material and a paving method using the primer composition for cement base material.

[0002]

2. Description of the Related Art Base materials for building floors and roads are usually
It is a cement foundation material made of concrete or mortar, and it is widely practiced to apply a pavement material made of resin on the cement foundation material to form a paved floor or a paved road.

In such a pavement, since a large amount of water is contained in the surface immediately after the cement base material is placed, even if the pavement material is immediately applied to such a wet surface, the adhesive performance is not improved. Since it is low, after setting the cement base material, a certain curing period is provided, the surface is dried, the primer is applied, and then the pavement material is applied.

Also, for example, when the floor of a food factory is being repaired, the surface of the cement base material may be in a wet state, and a certain curing period may be provided or a burner or the like may be used. After rubbing the surface, etc. to dry, apply a primer, and then,
Pavement material is constructed.

However, when the surface of the cement base material is dried by thus providing a certain curing period or by rubbing the surface with a burner or the like, a great delay in the construction period and troublesome work are required. Therefore, for example, in Japanese Patent Laid-Open No. 7-277857, if a base conditioning material composition obtained by mixing hydraulic cement with a one-component moisture-curable urethane prepolymer is used as a primer, the wet surface of the cement base material is immediately exposed. It is described that the cement base material and the pavement material can be well bonded even when applied.

[0006]

However, JP-A-7-2
The undercoating material composition described in Japanese Patent No. 77857 is, for example, a cement undercoating material and a paving material when the cement undercoating material and the paving material are bonded via the undercoating material composition and then immersed in water. There is a demand for the development of a primer that does not have sufficient adhesiveness to a wet surface having a large amount of moisture, such as peeling at the interface with, and can exhibit sufficient adhesiveness to the wet surface of a cement base material.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cement substrate having sufficient adhesive performance even on a wet surface of a cement substrate having a large amount of water. It is intended to provide a primer composition for lumber and a paving method using the primer composition for cement base material.

[0008]

In order to achieve the above object, the primer composition for cement base material of the present invention is characterized by containing a polyurethane resin and an aluminum oxide powder.

Further, the primer composition for cement base material of the present invention preferably contains 10 to 500 parts by weight of aluminum oxide powder with respect to 100 parts by weight of polyurethane resin.

Further, the primer composition for cement base material of the present invention can be suitably applied to the wet surface of the cement base material, especially the wet surface of the cement base material containing 6% by weight or more of water. .

The present invention further provides a step of applying the above-described primer composition for a cement base material of the present invention on a wet surface of a cement base material, and a cement base material to which the primer composition for a cement base material is applied. It also includes a paving method including a step of applying a paving material on the wet surface.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The primer composition for a cement base material of the present invention contains a polyurethane resin and an aluminum oxide powder.

Examples of polyurethane resins include one-component polyurethane resins and two-component polyurethane resins.

The one-pack type polyurethane resin is a type of polyurethane resin in which a urethane prepolymer is cured by reacting with a moisture component in the air. The urethane prepolymer is
Usually, it is prepared as a urethane prepolymer having an isocyanate group at the molecular end by reacting a polyisocyanate with a compound containing an active hydrogen group.

As the polyisocyanate, for example,
2,4 or 2,6-tolylene diisocyanate (TD
I) and mixtures thereof, diphenylmethane-4,4'-
Diisocyanate (MDI), diphenylmethane-2,
4'-diisocyanate (2,4'-MDI), naphthalene-1,5-diisocyanate (NDI), 3,3 '
-Dimethyl-4,4'-biphenylene diisocyanate (TODI), liquid diphenylmethane diisocyanate (liquid MDI) liquefied by various conventionally known methods described in JP-B-38-4576, etc., crude tolylene diisocyanate ( Aromatic polyisocyanates such as crude TDI) and polymethylene polyphenyl polyisocyanate (crude MDI), for example, hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), bis (isocyanatomethyl) cyclohexane (H ₆ XDI), dicyclohexyl. Methane-
Aliphatic polyisocyanates containing alicyclic groups such as 4,4′-diisocyanate (H ₁₂ MDI), for example, araliphatic polyisocyanates such as tetramethyl xylylene diisocyanate (TMXDI) and xylylene diisocyanate (XDI). To be

These may be used alone or in combination of two or more. Preferably aromatic polyisocyanates, more preferably 2,4 or 2,6-tolylene diisocyanate (TDI) and mixtures thereof, diphenylmethane-4,4'-diisocyanate (MD
I), liquid diphenylmethane diisocyanate (liquid M
DI), crude tolylene diisocyanate (crude TDI), and polymethylene polyphenyl polyisocyanate (crude MDI).

The active hydrogen group-containing compound is an organic compound having two or more active hydrogen groups (eg, hydroxyl group, amino group, etc.), and examples thereof include polyol and polyamine.

As the polyol, for example, glycols such as ethylene glycol, propylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1,6-hexane glycol, trimethylolpropane, neopentyl glycol, glycerin and the like. And low molecular weight polyols such as triols.
Further, for example, poly (oxypropylene) polyol,
Poly (oxyethylene) polyol, poly (oxyethylene propylene) polyol, poly (oxytetramethylene) glycol, poly (caprolactone) polyol, polybutadiene polyol, poly (butylene carbonate) polyol, poly (hexamethylene carbonate) polyol, poly (ethylene Adipate) diol, poly (propylene adipate) diol, poly (butylene adipate) diol, poly (hexane adipate) diol, bisphenol compound (eg, bisphenol A, bisphenol B, bisphenol F, bisphenol S, etc.) and alkylene oxide (eg, ethylene) Oxide, propylene oxide, etc.)
And high molecular weight polyols such as bisphenol-based diols and castor oil-based polyols formed from the reaction product with

Examples of the polyamines include aliphatic polyamines such as ethylenediamine, ethylenetriamine, triethylenetetramine, hexamethylenediamine, isophoronediamine and poly (oxyalkylene) polyamines, such as 4,4'-diphenylmethanediamine. , 4-tolylenediamine, 2,6-tolylenediamine, 3,5-diethyl-2,4-diaminotoluene, 3,5-diethyl-2,6-diaminotoluene,
Examples include aromatic polyamines such as 1,3,5-triethyl-2,6-diaminobenzene.

These active hydrogen group-containing compounds may be used alone or in combination of two or more. Preferably, a polyol, more preferably a poly (oxypropylene) polyol, a poly (oxyethylene) polyol, a poly (oxyethylene propylene) polyol, a poly (oxytetramethylene) glycol, a polybutadiene polyol, a bisphenol diol, a castor oil-based polyol is used. And a number average molecular weight of 200 to 600
It is preferably 0 and has an average number of functional groups of 2 to 6.

Then, by reacting the above-mentioned polyisocyanate with the active hydrogen group-containing compound at a ratio such that the isocyanate groups of the polyisocyanate are in excess of the active hydrogen groups of the active hydrogen group-containing compound, the isocyanate is added to the molecular terminals. Urethane prepolymers having groups can be prepared.

More specifically, this reaction is carried out, for example, by reacting the active hydrogen groups (OH, NH, etc.) of the active hydrogen group-containing compound with the isocyanate groups (NC) of the polyisocyanate.
The reaction may be carried out at a reaction temperature of about 40 to 130 ° C. for 4 to 10 hours at a ratio such that the equivalent ratio (NCO / H) of O) is 1.2 to 10.

In the reaction, conventionally known catalysts, solvents and the like may be used, and further known additives such as stabilizers, defoamers and plasticizers described later may be added.

Examples of the solvent include aromatic solvents such as benzene, xylene and toluene, ester solvents such as ethyl acetate, butyl acetate, cellosolve acetate, methyl cellosolve acetate, carbitol acetate and methyl carbitol acetate. Examples thereof include ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, and ether solvents such as tetrahydrofuran.

As the catalyst, for example, triethylamine, tripropylamine, N-methylmorpholine,
N-octadecylmorpholine, triethanolamine,
Amine-based catalysts such as triethylenediamine, for example, tin acetate, tin octylate, tin oleate, tin laurate, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dichloride, dibutyltin oxide, bismuth octylate, bismuth neodecanoate, Examples thereof include organometallic catalysts such as lead octylate, lead naphthenate, nickel naphthenate, and cobalt octylate.

The urethane prepolymer thus obtained has an isocyanate group content of 1 to 15%, more preferably 2.5 to 12%.

By diluting such a urethane prepolymer with the above-mentioned solvent, its viscosity finally becomes 1000 mPa · s (25 ° C.) or less, and further 500 mPa · s (25 ° C.) or less. Is preferably adjusted so that If the viscosity exceeds this, workability during construction may be reduced.

The two-component polyurethane resin is a polyurethane resin of the type in which a main agent containing polyisocyanate and a curing agent containing an active hydrogen group-containing compound are individually prepared and mixed and cured at a construction site. .

Examples of the main agent include the above-mentioned polysocyanate and / or urethane prepolymers, preferably aromatic polyisocyanates, more preferably 2,4 or 2,6-tolylene diisocyanate (TDI) and its compounds. Mixture, diphenylmethane-4,
4'-diisocyanate (MDI), liquid diphenylmethane diisocyanate (liquid MDI), crude product of tolylene diisocyanate (crude TDI), simple substance (monomer) of polymethylene polyphenyl polyisocyanate (crude MDI), or urethane prepolymer using these Is mentioned.

The curing agent contains an active hydrogen group-containing compound, and may further contain a filler, a plasticizer, and other additives, if necessary.

Examples of the active hydrogen group-containing compound include the active hydrogen group-containing compounds described above, preferably a polyol, more preferably a poly (oxypropylene) polyol, a poly (oxyethylene) polyol, and a poly (oxyethylenepropylene). ) Polyols, poly (oxytetramethylene) glycols, polybutadiene polyols, bisphenol-based glycols and castor oil-based polyols are preferable, and those having a number average molecular weight of 200 to 6000 and an average number of functional groups of 2 to 6 are preferable.

As the filler, calcium carbonate, barium carbonate, barium sulfate, talc, barite, anhydrous gypsum,
Examples include extender pigments such as magnesium carbonate, magnesium hydroxide, mica, zinc white, lead white, lithopone, and zinc sulfide. Further, for example, titanium oxide, carbon black,
Coloring pigments such as iron oxide, lead chromate, chromium oxide, ultramarine, cobalt blue, cyanine blue, cyanine green, lake red, and quinacridone red can be mentioned.

Examples of the plasticizer include dimethyl phthalate, diethyl phthalate, dibutyl phthalate, diheptyl phthalate, di2-ethylhexyl phthalate, diisooctyl phthalate, di-n-octyl phthalate, dinonyl phthalate and phthalic acid. Diisodecyl, ditridecyl phthalate,
Phthalates such as dibutylbenzyl phthalate and dicyclohexyl phthalate, for example, dioctyl adipate, diisodecyl adipate, dioctyl azelate, dibutyl sebacate, dioctyl sebacate, and the like dibasic acid esters such as diethylene glycol diester. Benzoate, glycol esters such as dipentaerythritol hexaester, for example, phosphate esters such as tricresyl phosphate, trioctyl phosphate, for example, epoxy plasticizers such as epoxidized soybean oil, butyl epoxystearate, octyl epoxystearate. Agents and the like.

Examples of other additives include the above-mentioned catalyst, leveling agent, defoaming agent, thickener, dispersant, color separation preventing agent, stabilizer and the like.

The compounding ratio of the active hydrogen group-containing compound, the filler, the plasticizer, and the additive in the curing agent is, for example, 100 parts by weight of the active hydrogen group-containing compound and 0.1 to 1 of the filler.
20 parts by weight, preferably 0.1 to 80 parts by weight, plasticizer 0.1 to 60 parts by weight, preferably 0.1 to 50 parts by weight, additive 0.1 to 20 parts by weight, preferably , 0.1
10 to 10 parts by weight.

In the two-component polyurethane resin, the mixing ratio of the main agent and the curing agent is such that the equivalent ratio of the isocyanate group in the main agent and the active hydrogen group in the curing agent (NCO / H
Ratio) is in the range of 0.5 to 2.0, preferably 0.8 to 1.2.

By diluting the main agent and / or the curing agent with the above-mentioned solvent, the viscosity after mixing the main agent and the curing agent finally becomes 1000 mPa · s (25
C.) or lower, more preferably 500 mPa · s (25 ° C.) or lower. If the viscosity exceeds this, workability during construction may be reduced.

The aluminum oxide powder is Al ₂ O.
Alumina hydrate represented by the alumina or _{Al 2 O} 3 · nH 2 _O representable _3. Alumina and alumina hydrate have α, β, γ, δ, ε, ζ, χ, and
Many types such as ρ have been recognized, and the properties vary greatly depending on their crystallinity. The aluminum oxide powder effective in the present invention is activated alumina containing ρ-alumina, and hydraulic alumina is preferable. The average particle diameter of these aluminum oxide powders is preferably 300 μm or less, and more preferably 150 μm or less.

The primer composition for cement base material of the present invention contains, for example, 10 to 500 parts by weight, and further 20 parts by weight of aluminum oxide powder to 100 parts by weight of polyurethane resin (solid content excluding solvent). It can be prepared by blending in a proportion of 300 parts by weight. If the blending ratio of the aluminum oxide powder is less than this, the adhesive strength may be reduced, and if it is more than this,
Workability may decrease.

More specifically, for example, when the polyurethane resin is a one-pack type polyurethane resin, aluminum oxide powder may be prepared in advance by mixing it with a urethane prepolymer. Then, the aluminum oxide powder and the urethane prepolymer may be mixed. Further, for example, when the polyurethane resin is a two-component polyurethane resin, aluminum oxide powder may be mixed with the curing agent in advance to prepare, and at the construction site, the aluminum oxide powder and the main agent and You may mix with a hardening agent.

The primer composition for cement base material of the present invention further contains a dehydrating agent such as magnesium oxide, magnesium hydroxide, calcium oxide, calcium hydroxide, zeolite, Portland cement, alumina cement, and Erwin cement. The aluminum oxide powder may be mixed in the same manner and in the same amount.

Next, the paving method of the present invention for paving on a cement base material such as a floor of a building or a road using the primer composition for a cement base material of the present invention will be described.

In this method, first, a cement base material is placed. The cement base material is made of concrete in which cement, water, sand, and gravel are kneaded, or mortar in which cement, water, and sand are kneaded, and is placed by a known method as a floor of a building floor or road. .

Then, after the casting, the primer composition for a cement base material of the present invention is applied (coated) to the wet surface of the cement base material containing a large amount of water. Immediately after placing the cement base material or immediately after being exposed to rainfall, the surface layer portion (wetting surface) thereof usually contains 6% by weight or more of water, further 10 to 30% by weight. The primer composition for a base material is thus applied to a wet surface containing a large amount of water. The construction can be carried out by a known method using a trowel, a roller, a rake, and a spray gun, and the construction amount is, for example, 0.05.
~ 0.5 kg / m ² , preferably 0.1-0.3 kg /
m ² .

The amount of water on the wet surface is obtained, for example, by cutting a predetermined area from the cement base material at a depth of 1 cm, and from the weight of the sample immediately after cutting, from the weight loss of the sample after drying. be able to.

Then, on the wet surface of the cement substrate, on which the primer composition for cement substrate of the present invention is applied,
Apply (paint) pavement material.

Examples of the pavement material include known pavement materials such as urethane-based pavement materials, epoxy-based pavement materials, acrylic-based pavement materials, and vinyl ester-based pavement materials. Depending on the construction conditions, trowel,
Known methods using rollers, rakes, spray guns, etc. are used, and the amount of construction is, for example, 0.5 to 5 kg.
/ M ² , preferably 0.7 to 3 kg / m ² .

Further, the primer composition for a cement underlaying material of the present invention exhibits sufficient adhesion performance between the cement underlaying material and the paving material even when applied on a wet surface containing a large amount of water. Therefore, by such a paving method, the period and labor for drying the wet surface can be saved,
Good pavement of cement base material can be realized in a short time.

The paving method of the present invention can also be applied to repairing or repairing roads, for example. That is, when repairing or rehabilitating a road, the pavement material is usually peeled off while sprinkling water, and then a new pavement material is paved. Is a wet surface. Also, after the pavement material has been stripped off, even if there is rainfall or the road is moisturized due to water retention, the surface of the cement base material becomes a wet surface on which a large amount of water is sprinkled. Therefore, the cement base material primer composition of the present invention is applied to the wet surface, on which, if a pavement material is applied, omitting the time and labor for drying the wet surface, in a short time. Good road repairs and repairs can be realized.

In the above description, after the polyurethane resin and the aluminum oxide powder are blended to prepare the primer composition for cement base material of the present invention,
Although it was adapted to be applied to the wet surface of the cement base material, for example, the polyurethane resin and the aluminum oxide powder were directly applied to the wet surface of the cement base material, respectively, to prepare the primer composition for the cement base material of the present invention. You may perform preparation and construction of a thing simultaneously.

[0051]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the Examples.

[Preparation of one-pack type polyurethane resin A] To 360 parts by weight of polymethylene polyphenyl polyisocyanate, 450 parts by weight of xylene, 100 parts by weight of ethyl acetate and 0.02 part by weight of dibutyltin dilaurate were added. Polyoxypropylene triol (number average molecular weight 315) was gradually added thereto and reacted at 80 ° C. for 3 hours to obtain a one-pack type polyurethane resin A having a viscosity of 80 mPa · s.

[Preparation of Two-Component Polyurethane Resin B] To 25 parts by weight of polymethylene polyphenyl polyisocyanate,
75 parts by weight of ethyl acetate was added to obtain a main agent.

250 parts by weight of polyoxypropylene triol (number average molecular weight 1000), 160 parts by weight of propylene oxide 3 mol adduct of bisphenol A (BPX-33, manufactured by Asahi Denka Co., Ltd.), 100 parts by weight of calcium carbonate,
A curing agent was obtained by adding 0.5 parts by weight of an antifoaming agent and dispersing at high speed.

In this way, a two-component polyurethane resin B composed of the main agent and the curing agent was prepared.

Example 1 100 parts by weight of one-component polyurethane resin A (40 parts by weight as solid content) and 100 parts by weight of activated alumina (BK-112, manufactured by Sumitomo Chemical Co., Ltd.) were mixed and dispersed at high speed to prepare a primer composition. I got a thing.

Example 2 100 parts by weight of one-component polyurethane resin A (40 parts by weight as a solid content) and 200 parts by weight of activated alumina (BK-112, manufactured by Sumitomo Chemical Co., Ltd.) were mixed and dispersed at a high speed to prepare a primer composition. I got a thing.

Example 3 20 parts by weight of main component of two-component polyurethane resin B, curing agent 2
8 parts by weight (48 parts by weight as two-component polyurethane resin B (38 parts by weight as solid content)), activated alumina (BK-
No. 112, manufactured by Sumitomo Chemical Co., Ltd.) and mixed at a high speed to obtain a primer composition.

Example 4 20 parts by weight of main component of two-component polyurethane resin B, curing agent 2
8 parts by weight (48 parts by weight as two-component polyurethane resin B (38 parts by weight as solid content)), activated alumina (BK-
112, manufactured by Sumitomo Chemical Co., Ltd.) and mixed at a high speed to obtain a primer composition.

Example 5 20 parts by weight of main component of two-component polyurethane resin B, curing agent 2
8 parts by weight (48 parts by weight as two-component polyurethane resin B (38 parts by weight as solid content)), activated alumina (BK-
No. 112, manufactured by Sumitomo Chemical Co., Ltd.) 20 parts by weight were mixed and dispersed at high speed to obtain a primer composition.

Comparative Example 1 100 parts by weight of one-component polyurethane resin A (40 parts by weight as solid content) and 100 parts by weight of Portland cement were mixed and dispersed at high speed to obtain a primer composition.

Comparative Example 2 20 parts by weight of main component of two-component polyurethane resin B, curing agent 2
8 parts by weight (48 parts by weight as the two-component polyurethane resin B (38 parts by weight as the solid content)) and 12 parts by weight of Portland cement were mixed and dispersed at a high speed to obtain a primer composition.

Evaluation After the cement board was immersed in water for 24 hours, it was taken out and the surface water was wiped off. Immediately thereafter, each Example and each Comparative Example immediately after being prepared was applied onto the surface of this cement board at a rate of 0.2 kg / m ^2, and 3
After 0 minutes, a fast-curing urethane resin-based pavement material (rim spray R2000 (manufactured by Mitsui Takeda Chemical Co., Inc.)) was applied. Six hours after that, it was immersed in water for 24 hours, then taken out and the adhesive strength (according to JIS A 6916-1998) was measured and the state of breakage was observed. The results are shown in Table 1. In addition, Table 1 also shows workability at the time of application of each example and each comparative example to the cement plate.

The amount of water on the surface of the cement board after it was wiped off was about 10% by weight. The amount of water on the surface (wet surface) is measured by wiping off the water on the surface of the cement board, cutting the surface of the cement board in a size of 1 cm in length × 1 cm in width × 1 cm in depth, and measuring the sample immediately after the cutting. After measuring the weight, the sample was dried at 110 ° C. for 2 hours, and the weight of the dried sample was determined from the measured weight loss.

[0065]

[Table 1] From Table 1, it can be seen that the primer composition of each example has a higher adhesive force and is satisfactorily broken than the primer composition of each comparative example.

[0066]

EFFECTS OF THE INVENTION According to the primer composition for a cement base material of the present invention, even if it is applied to a wet surface containing a large amount of water, a sufficient adhesive performance between the cement base material and the paving material can be obtained. Can be expressed. Therefore, according to the paving method of the present invention, it is possible to realize a favorable paving of the cement base material in a short time while omitting the time and labor for drying the wet surface.

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Claims (5)

[Claims] 1. A primer composition for cement base material, which comprises a polyurethane resin and an aluminum oxide powder. 2. The primer composition for a cement base material according to claim 1, which contains 10 to 500 parts by weight of aluminum oxide powder with respect to 100 parts by weight of the polyurethane resin. 3. The primer composition for a cement undercoat material according to claim 1, which is applied to a wet surface of the cement undercoat material. 4. The primer composition for a cement undercoat material according to claim 3, wherein the wet surface of the cement undercoat material contains 6% by weight or more of water. 5. The method according to claim 1, which is provided on the wet surface of the cement base material.
Alternatively, the method comprises a step of applying the primer composition for a cement underlayment according to 2 or a step of applying a paving material on the wet surface of the cement underlayment with the primer composition for a cement underlayment applied. And the paving method.