KR20180002136A - Uncombustible or fire retardant color steel sheet, and method of manufacturing the same - Google Patents

Abstract

According to an embodiment of the present invention, provided are a non-combustible or fire retardant color steel sheet, and a method of manufacturing the same, wherein the non-combustible or fire retardant color steel sheet comprises: a steel sheet; a hot-dipped layer formed on at least one surface of the steel sheet; a pretreatment layer formed on the hot-dipped layer; a color coating layer formed on the pretreatment layer; and a ceramic transparent coating layer formed on the color coating layer. Therefore, the color steel sheet provides material properties required for construction interior materials and exterior materials, such as excellent machinability, fingerprint resistance, weather resistance, or the like, and further, has excellent incombustibility and fire retardancy.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-flammable or flame-retardant colored steel sheet,

The present invention relates to a color steel sheet having a nonflammable or flame retardant property, and a method for producing the same.

Color steel plates are increasing in demand for building materials, household appliances and automobile parts. On the other hand, the color steel sheet which is applied as the finishing material of the buildings has strengthened the standards of the nonflammability or flame retardancy as the standards of the fire protection regulations on the structure safety of the buildings are strengthened.

In the warehouse building, the use range of the fire retardant material which is not burned well when the sandwich panel is constructed is strengthened from the existing '3000㎡ or more' to the 'over 600㎡'. In addition, a ground rule has been established to use finishing materials above the flame retardant performance standard in the roof structure of the pilotty structure. Furthermore, it was revised to extend the use of flame retardant materials instead of quasi-fireproof materials as the exterior wall finishing materials for buildings to prevent flooding, and to expand buildings to 6 stories or more as determined by the Decree of the Decree.

In addition, a new law related to the flame retardancy of colored steel sheets used as building finishing materials has been newly established. Specifically, in the case of a composite material composed of an iron plate and a core material, the number of times of general coating is two or more times and the amount of plating is more than 180 g per square meter on the hot-dip galvanized steel sheet, and the thickness of the steel plate is plated (Article 4 (3) of the Framework Regulation on Fire Retardant Performance and Fire Prevention Standard for Building Finish Materials, enforced on January 1, 2016). However, in the new bill, the thickness of the color steel sheet is not more than 20 μm due to the purpose of preventing the spread of fire. Therefore, it is possible to realize a color coating with a thin coating thickness of the color steel sheet and to achieve the existing corrosion resistance, weather resistance, The technique of securing flame resistance together becomes important.

Japanese Patent Application No. 10-1499361 relates to a non-flammable color steel sheet and a method of manufacturing the same, wherein a flame retardant coating composition which is a ceramic colored paint is coated on a base steel sheet to have a flame retardancy characteristic of a certain level or more and excellent workability, Corrosion resistance, hardness, and the like, and a method of manufacturing the same. Such a ceramic colored paint has excellent properties such as excellent hardness, weatherability, and weatherability, but is disadvantageous in that it is poor in workability. The thicker the ceramic color paints are, the more difficult it is to secure workability, and the minute cracks are generated on the surface of the coating layer during the drying process, thereby deteriorating weatherability and airtightness. In addition, when a metal oxide pigment is added to a ceramic colored paint to realize a color, the physical properties are deteriorated, and it is also difficult to realize various colors.

The present invention is to provide a color steel sheet which is easy to implement colors, provides physical properties required for building interior materials and exterior materials, and has a nonflammable or flame retardant property, and a method of manufacturing the same.

According to an embodiment of the present invention, there is provided a method of manufacturing a steel plate, comprising the steps of: forming a steel plate, a molten plated layer formed on at least one surface of the steel plate, a pretreatment layer formed on the molten plated layer, a color coating layer formed on the pretreatment layer, Flame retardant colored steel sheet.

The molten plated layer may be a zinc plated layer, an aluminum plated layer, a zinc-aluminum alloy plated layer, or a zinc-aluminum-magnesium alloy plated layer.

The pretreatment layer may be a phosphoric acid coating layer, a chromate or a non-chromate coating layer.

The pretreatment layer may have a thickness of more than 0 and 1 m or less.

The color coating layer may have a thickness of 7 to 15 mu m.

The ceramic transparent coating layer contains 5 to 50% by weight of metal oxide nanosol, 48 to 69% by weight of silane, 0.01 to 1.0% by weight of an acidity control agent, 0.5 to 3.0% by weight of a thickener, 0.1 to 3.0% by weight of a quencher, Or a sol-gel reaction of the ceramic clear coating composition.

The metal oxide may be at least one selected from the group consisting of silica, titania, alumina, zirconia, magnesium oxide, and zinc oxide.

The silane may be selected from the group consisting of vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tri-isopropoxy silane, 3-methacryloxypropyl trimethoxysilane 3-methacryloxypropyl trimethoxy silane, 2-glycidyloxy propyl trimethoxy silane, 2-glycidyloxy propyl triethoxy silane, 2-amino 2-aminopropyl triethoxy silane, 2-ureidoalkyl triethoxy silane, tetraethoxy silane, methyltrimethoxy silane, tetra Aminopropyltrimethoxy silane (N-beta- (Aminoethyl) -gamma-aminopropyltrimethoxy silane), 3-aminopropyltriethoxy silane (3-aminopropyltriethoxy silane) silane), triethoxy Triethoxyphenyl silane, trimethoxyphenyl silane, and the like.

The ceramic transparent coating layer may have a thickness of 3 to 5 탆.

According to another embodiment of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: forming a pretreatment layer on a hot-dip coated steel sheet; forming a color coating layer on the pretreatment layer; and forming a ceramic transparent coating layer on the color coating layer. Or a method of manufacturing a flame-retardant colored steel sheet.

The hot-dip coated steel sheet may be a galvanized steel sheet, an aluminum coated steel sheet, a zinc-aluminum alloy coated steel sheet, or a zinc-aluminum-magnesium alloy coated steel sheet.

The pretreatment layer may be a phosphoric acid coating, a chromate, or a non-chromate coating.

The pretreatment layer may have a thickness of more than 0 and 1 m or less.

The color coating layer may have a thickness of 7 to 15 mu m.

The ceramic transparent coating layer contains 5 to 50% by weight of metal oxide nanosol, 48 to 69% by weight of silane, 0.01 to 1.0% by weight of an acidity control agent, 0.5 to 3.0% by weight of a thickener, 0.1 to 3.0% by weight of a quencher, Or a sol-gel reaction of the ceramic clear coating composition.

The ceramic transparent coating layer may have a thickness of 3 to 5 탆.

The color steel sheet according to an embodiment of the present invention is easy to color, has the properties required for a building interior material such as excellent workability, weatherability, weather resistance, and the like, as well as excellent in nonflammability or flame retardancy.

1 and 2 are views schematically showing a cross section of a color steel sheet according to an embodiment of the present invention.
Fig. 3 is a photograph (a) of a device for testing the non-flammability of a color steel plate specimen and Fig. 3 (b) is a schematic view thereof.
4 to 6 are temperature graphs showing the results of the incombustibility test of Examples 1 to 3.
Fig. 7 is a photograph (a) of a device for testing the flame retardancy of a color steel plate specimen and Fig. 7 (b) is a schematic view thereof.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.

The present invention relates to a color steel sheet having a nonflammable or flame-retardant property and a method for producing the same, and more particularly, to a color steel sheet which is easy to color and provides physical properties required for a building interior material and exterior material, .

A color coated steel sheet according to an embodiment of the present invention includes a steel sheet, a molten plated layer formed on at least one surface of the steel sheet, a pretreatment layer formed on the molten plated layer, a color coating layer formed on the pretreatment layer, .

1 and 2 are schematic views of a cross section of a color steel sheet according to an embodiment of the present invention. In FIGS. 1 and 2, a steel sheet 1, a hot-dip coating layer 2, a pretreatment layer 3, 4), and a ceramic transparent coating layer 5 are sequentially laminated.

In a typical color steel plate, a color coating film formed on the steel plate 1 is composed of components that are easily burned, and further, harmful gas is generated due to combustion of the color coating film. However, in the present invention, the thickness of the color coating layer 4 is made as thin as possible to reduce mass reduction caused by combustion and to minimize the emission of noxious gas. In addition, the present invention can provide the color of the color coating layer itself by forming the ceramic transparent coating layer 5 on the color coating layer 4, and protect the color coating layer from the flame when a fire occurs.

The colored steel sheet according to an embodiment of the present invention includes a molten plated layer 2 formed on a steel sheet 1 and the molten plated layer is formed of a zinc plated layer, an aluminum plated layer, a zinc-aluminum alloy plated layer, or a zinc- Alloy plating layer. Particularly, since the zinc-aluminum-magnesium alloy plating layer has a high corrosion resistance property and is excellent in the corrosion resistance of cut surfaces and processed portions, the hot-dip coating layer of the present invention is preferably a zinc-aluminum-magnesium alloy plating layer.

A pretreatment layer 3 may be formed on the molten plated layer 2. The pretreatment layer is not particularly limited as long as it is a conventional pretreatment layer formed by a method of pretreatment on a plating layer, but may be, for example, a phosphate coating layer, a chromate layer or a non-chromating coating layer. By forming a phosphoric acid coating, a chromate or a non-chromate coating on the surface of the molten plated layer, the adhesion and corrosion resistance of the color coating layer 4 can be secured.

It is preferable that the pretreatment layer 3 has a thickness of more than 0 and 1 m or less. If the thickness of the pretreatment layer exceeds 1 탆, the process operation cost increases and the internal stress increases after drying of the pretreatment layer, so that the adhesion of the color coating layer 4 may be degraded.

The color steel sheet of one embodiment of the present invention may include a color coating layer 4 formed on the pretreatment layer 3. [ The color coating layer may be a color coating film imparting a desired color to the color steel sheet, and may be a cured product of the coloring coating composition.

The colored coating composition may include a base resin, a pigment, an additive and a solvent. The base resin may be at least one selected from the group consisting of a polyester resin, an epoxy resin, an acrylic resin, and an alkyd resin. The pigment may be an organic and / or inorganic pigment used for a color steel sheet without limitation, and polyamide may be used in particular. The organic pigments may be selected from azo pigments such as beta-naphthols (insoluble), naphthol AS (insoluble), condensed azo pigments, phthalocyanine pigments, quinacridone pigments, dioxazine pigments, isoindolinone pigments, Fluorovinyl, quinophthalone, and the like, but are not limited thereto. The inorganic pigments include zinc oxide, titanium dioxide, lithopone, basic lead carbonate, iron oxide, carbon black, lead chromate, yellow iron oxide, brilliant carbon, basic lead carbonate, bismuth oxychloride, mica titanium, But is not limited thereto.

On the other hand, the solvent may use an aromatic hydrocarbon solvent to prevent a uniform coating film hardening and a scratch such as a roll mark, and an ester type or ether type solvent may be used in combination to improve workability and storage stability have. The preferable ratio of the solvent may be 5 to 30% by weight of aromatic hydrocarbons, 3 to 5% by weight of ester solvents and ether solvents, respectively. The lower limit of the compounding ratio is a lower limit of the effect of the solvent. When the upper limit is exceeded, it may be difficult to obtain a clear color at a predetermined film thickness due to excessive solvent. The above-mentioned additives may include antifoaming agents, curing accelerators, waxes and the like. The antifoaming agent preferably contains 2 to 3% by weight in order to inhibit or remove bubbles in the coating film. 2% by weight, and the wax preferably contains 1 to 3% by weight for maintaining the gloss and dissociating the pigment.

The color coating layer 4 preferably has a thickness of 7 to 15 탆, which corresponds to a minimum thickness for realizing a desired color. The present invention can reduce the mass loss caused by combustion and minimize the emission of noxious gas by forming a thin color coating film as compared with a conventional color steel plate. Specifically, when the thickness of the color coating layer is less than 7 mu m, it is difficult to realize the hue required due to color interference. When the thickness exceeds 15 mu m, the amount of mass decrease when the flame is generated in the colored steel sheet increases and harmful gas may be generated.

The ceramic transparent coating layer 5 may be formed on the color coating layer 4, and the ceramic transparent coating layer may be formed of a ceramic component and may be transparent. Thus, the color of the color coating layer may be realized, Can be protected.

The ceramic clear coating layer 5 may be formed by coating a ceramic clear coating composition on the color coating layer. The ceramic clear coating composition may include a metal oxide nanosol, a silane, an acidity regulator, an additive, and a solvent, and may be formed by drying the resultant obtained by sol-gel reaction.

The ceramic clear coating layer obtained by the sol-gel reaction is a hybrid composite coating having an intermediate property of inorganic and organic. Therefore, it is possible to solve the brittle disadvantages that may occur when the inorganic material is used alone, and it is also advantageous in that it can be processed into various shapes when the coated steel sheet is processed by providing flexibility through addition of organic substances.

The ceramic clear coating composition comprises 5 to 50% by weight of a metal oxide nanosol, 48 to 69% by weight of silane, 0.01 to 1.0% by weight of an acidity control agent, 0.5 to 3.0% by weight of a thickener, 0.1 to 3.0% by weight of a quencher, .

Metal oxide nanosol (nano sol) is a kind of inorganic nano sol, and can contribute to improvement of hardness, chemical resistance and heat resistance of the ceramic transparent coating layer through chemical bonding with the silane. The metal oxide forming the nano sol may be at least one selected from the group consisting of silica, titania, alumina, zirconia, magnesium oxide, and zinc oxide.

The average diameter of the metal oxide may be 5 to 20 nm, and the average diameter of the metal oxide may be controlled within this range, so that the ceramic clear coating composition can be maintained in a stable state. On the other hand, the content of the metal oxide nanosol is preferably 5 to 50% by weight. If the content of the metal oxide nano-sol is less than 5% by weight, it is difficult to induce sufficient bonding with the silane, so that the surface hardness of the coating film is decreased, the heat resistance and chemical resistance are lowered, and further, the effect of adding the niobium oxide nanosol is insufficient have. On the other hand, if the content of the metal oxide nano-sol exceeds 50% by weight, the metal oxide which is not bonded to the silane remains in the ceramic clear coating layer, resulting in deterioration of the coating film formation and adherence.

The silane is a material for forming a coating film, and is preferably at least one selected from the group consisting of aminosilane and / or alkoxysilane. Specifically, the silane is preferably silane that can be stabilized after hydrolysis, and examples thereof include vinyl trimethoxy silane, vinyl triethoxy silane, vinyl triisopropoxy silane, But are not limited to, vinyl tri-isopropoxy silane, 3-methacryloxypropyl trimethoxy silane, 2-glycidyloxy propyl trimethoxy silane, 2-glycidoxypropyl trimethoxy silane, 2-aminopropyl triethoxy silane, 2-ureidoalkyl triethoxy silane, 2-aminopropyl triethoxy silane, 2-aminopropyl triethoxy silane, Tetraethoxysilane, methyltrimethoxy silane, tetraethoxy silane, N-beta- aminoethyl-gamma-aminopropyltrimethoxysilane (N-beta- (Aminoethyl ) -gamma-aminopropyl trimethoxy silane, trimethoxy silane, 3-aminopropyltriethoxy silane, triethoxyphenyl silane, trimethoxyphenyl silane, and the like.

The content of the silane is preferably 48 to 69 wt%, and if the content of the silane is less than 48 wt%, it is difficult to form a sufficient bond with the metal oxide nanosol, The organic gas may be discharged due to pyrolysis and a large amount of silanol may remain, resulting in deterioration of the water resistance, water resistance, chemical resistance, and the like of the ceramic transparent coating layer.

The acidity controlling agent serves to improve the stability of the silane while assisting in the hydrolysis of the silane. The acidity adjusting agent is composed of an organic acid such as acetic acid, formic acid, lactic acid, or glycolic acid, or an organic acid such as sulfuric acid, nitric acid, hydrochloric acid, Lt; / RTI > group.

If the content of the acidity modifier is less than 0.01% by weight, the storage stability of the coating solution may deteriorate due to the increase in the hydrolysis time. If the content of the acidity modifier exceeds 1.0% by weight, And molecular weight control may become difficult.

The thickener improves workability by controlling the viscosity of the ceramic clear coating composition and prevents precipitation of the quencher. The content of the thickener may be 0.5 to 3.0% by weight. If the content of the thickener is less than 0.5% by weight, the viscosity of the solution may not be increased, and the workability may be deteriorated. If the content of the thickener is more than 3.0% by weight, stability of the solution and deterioration of chemical resistance may be caused.

On the other hand, the quencher has a function of controlling the gloss and improving the hardness of the coating film, and its content may be 0.1 to 3.0% by weight. If the content of the quencher is less than 0.1 wt%, it may be difficult to control the gloss and improve the hardness of the coating film. If the content of the quencher is more than 3.0 wt%, the gloss may decrease and the coating film may be cracked.

The solvent may serve to control the compatibility and hydrolysis of the silane with respect to water, the wettability of the treatment agent, and the drying rate. The type of the solvent is not limited thereto, and for example, one or more of water-soluble solvents such as methanol, ethanol, 2-propanol, 2-methoxypropanol and 2-butoxyethanol may be used.

The solvent is preferably added in an amount of 0.1 to 25% by weight, more preferably 0.1 to 10% by weight, based on the total weight of the coating liquid. If the solvent is less than 0.1 wt%, the storage stability of the ceramic clear coating composition may be adversely affected. If the solvent is more than 25 wt%, the stability of the coating solution may be deteriorated and the viscosity may be affected.

The ceramic transparent coating layer 5 may have a thickness of 3 to 5 탆. If the thickness of the ceramic transparent coating layer is less than 3 탆, the physical properties required of the color steel sheet for building materials such as weatherability, weather resistance, hardness and the like may be poor, and the performance for protecting the color coating layer 4 from flames when a fire occurs may be insufficient. On the other hand, if the ceramic transparent coating layer is more than 5 mu m, cracks may be generated during molding and processing for commercialization of the color steel sheet, which may result in poor physical properties and properties of the processed portion.

According to another embodiment of the present invention, it is possible to provide a method of manufacturing a color steel sheet having a nonflammable or flame retardant property.

Specifically, the method for manufacturing a color steel sheet includes the steps of forming a pretreatment layer 3 on a hot-dip coated steel sheet, forming a color coating layer 4 on the pretreatment layer, and forming a ceramic transparent coating layer 5). ≪ / RTI > On the other hand, it is preferable that each step of producing the color steel sheet is continuous, and thus, the color steel sheet can be manufactured more easily.

The molten plated layer 2 may be a zinc plated layer, an aluminum plated layer, a zinc-aluminum alloy plated layer, or a zinc-aluminum-magnesium alloy plated layer. Particularly, since the zinc-aluminum-magnesium alloy plating layer has a high corrosion resistance property and is excellent in the corrosion resistance of cut surfaces and processed portions, the hot-dip coating layer of the present invention is preferably a zinc-aluminum-magnesium alloy plating layer.

The pretreatment layer 3 may be a phosphoric acid coating, a chromate or a non-chromate coating. By forming a phosphoric acid coating, a chromate or a non-chromate coating on the surface of the molten plated layer 2, the adhesion and corrosion resistance of the color coating layer 4 can be ensured. On the other hand, the pre-treatment layer preferably has a thickness of more than 0 and 1 탆 or less, and the reason why the thickness of the pretreatment layer is limited to this range is the same as that described above.

The method for manufacturing a color steel sheet according to an embodiment of the present invention includes the step of forming a color coating layer 4 on the pretreatment layer 3 and the color coating layer is formed on a color coating film do. The thickness of the color coating layer is preferably 7 to 15 占 퐉, which corresponds to a minimum thickness for achieving a desired color. The color coating layer is thinner than a color coating film formed on a conventional color steel plate, The incombustibility or flame retardancy can be improved.

A ceramic transparent coating layer 5 may be formed on the color coating layer 4. Specifically, a ceramic clear coating composition is coated on the color coating layer and cured to form a ceramic transparent coating layer. The ceramic clear coating composition may include a binder resin and a ceramic dispersed therein. The ceramic clear coating composition comprises 5 to 50% by weight of a metal oxide nanosol, 48 to 69% by weight of silane, 0.01 to 1.0% by weight of an acidity control agent, 0.5 to 3.0% by weight of a thickener, 0.1 to 3.0% by weight of a quencher, .

Since the ceramic transparent coating layer is made of a ceramic component and is transparent, the color of the color coating layer can be realized as it is, and the color coating layer can be protected from the flame when a fire occurs. On the other hand, the thickness of the ceramic transparent coating layer 5 is preferably 3 to 5 mu m, and the reason for limiting the thickness to such a range is the same as that described above.

Hereinafter, the present invention will be described more specifically by way of specific examples. The following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited thereto.

Example

One. Color steel plate  Manufacture of specimens

A pretreatment layer was formed to a thickness of 500 nm on a zinc-aluminum-magnesium alloy-plated steel sheet. Thereafter, a mixture of 43 wt% of a polymeric polyester resin, 7 wt% of a melamine resin, 10 wt% of an inorganic pigment, 6 wt% of an organic pigment, 2 wt% of a polyamide, 18 wt% of an aromatic hydrocarbon, A composition containing 4% by weight of a solvent, 2% by weight of a defoaming agent, 2% by weight of a curing accelerator and 2% by weight of wax was coated on the pretreatment layer to a thickness of 15 탆 and dried by heating at 220 캜, .

Thereafter, a ceramic clear coating composition comprising 30% by weight of colloidal silica, 60% by weight of vinyltrimethoxysilane, 0.5% by weight of acetic acid, 6% by weight of methanol, 2% by weight of a thickener and 1.5% 5 탆 thick, and dried by heating at 220 캜 to form a ceramic clear coating layer 5 to prepare a color steel plate specimen.

2. Nonflammability test: KS F ISO 1182: 2009 (Nonflammability test method of building materials)

Fig. 3 is a photograph showing a photograph of a heating furnace for testing the incombustibility of a color steel plate specimen (45 mm in diameter, 50 mm in height, tested by stacking test pieces) and a schematic view thereof. In the incombustibility test, The postcolor steel specimens were placed in a heating furnace and heated for 20 minutes. Three replicate tests were carried out using three specimens.

Specifically, (a) the average temperature of the thermocouple in the heating furnace was maintained at 750 ° C ± 5 ° C for 10 minutes, (b) the mass of the color steel plate specimen was measured to 0.01 g, and the specimen was inserted into the holder and inserted into the furnace. C) After 20 minutes of heating, the specimen holder was removed from the furnace. D) The color steel specimen was cooled in a desiccator and the mass was measured. The results are shown in Table 1 below.

division Difference between peak temperature and final equilibrium temperature (° C) Mass reduction rate (%) Example 1 1.1 0.3 Example 2 1.4 0.3 Example 3 1.8 0.3

In order to meet the performance standard of the color steel plate according to KS F ISO 1182: 2009 (Non-combustibility test method of building materials), the maximum temperature in the heating furnace for 20 minutes after the start of the heating test shall not rise beyond the final equilibrium temperature by more than 20 ° C , And if the equilibrium is not reached for 20 minutes, the final one minute average temperature is defined as the final equilibrium temperature). After heating, the mass reduction rate of the color steel specimen should be 30% or less.

According to Table 1, in Examples 1 to 3, the temperature difference between the maximum temperature and the final equilibrium temperature is less than 1.8 占 폚, and the mass reduction rate is 0.3%, satisfying the performance standard of KS F ISO 1182: 2009 (incombustibility test method of building materials) .

4 to 6 are temperature graphs showing the results of the incombustibility test of Examples 1 to 3, wherein the horizontal axis represents time (s) and the vertical axis represents temperature (占 폚). According to Figs. 4 to 6, it was confirmed that the temperatures of Examples 1 to 3 were maintained at a substantially constant temperature without change.

3. Flammability test (gas hazard test): KS F 2271: 2006 (Test method for flame retardancy of interior materials and structures of buildings) 6. Gas hazard test

7 is a photograph of a device for testing the flame resistance of a color steel plate specimen (220 mm X 220 mm X 0.5 mm) and a schematic view thereof. In the flame retardancy test, eight rats (ICR female, 5 weeks, 18-22 g) were placed in a spinning basket, and the specimens were placed in a heating furnace and heated for 6 minutes (3 minutes of propane, 3 minutes of radiant heat) The effect of the gas on the rat through the stirring box went to the spinning basket box.

Specifically, (i) the temperature in the test box was kept at 30 DEG C, (ii) eight spinning baskets each containing one experimental white rat were placed in the test box. C) The test pieces were placed in a heating furnace and heated for 6 minutes. D) The behavioral stopping time of each experimental white rat was measured for 15 minutes after the initiation of heating, and the results are shown in Table 2.

Test number Mouse lineage Mouse sex Mouse Average Weight (g) Stop time (min: s) No.1 ICR female 19 14:58 No.2 ICR female 19 14:50

In order to satisfy the performance criterion of gas hazard test of color steel plate in KS F 2271: 2006 (flame retardancy test method of interior materials and structures of buildings), the average behavior stopping time of laboratory mice should be more than 9 minutes.

According to the above Table 2, it was confirmed that the behavior stoppage time of the test pieces No. 1 and 2 was 14:50 or more and satisfied the gas toxicity test performance standard of KS F 2271: 2006.

3. Gloss, MEK abrasion, pencil hardness, workability, Impact , Chemical resistance, Abdominal aquatic , Corrosion resistance, and moisture resistance test.

A pretreatment layer was formed to a thickness of 500 nm on a zinc-aluminum-magnesium alloy-plated steel sheet. Thereafter, a mixture of 43 wt% of a polymeric polyester resin, 7 wt% of a melamine resin, 10 wt% of an inorganic pigment, 6 wt% of an organic pigment, 2 wt% of a polyamide, 18 wt% of an aromatic hydrocarbon, A composition containing 4% by weight of a solvent, 2% by weight of a defoaming agent, 2% by weight of a curing accelerator and 2% by weight of wax was coated on the pretreatment layer to a thickness of 15 탆 and dried by heating at 220 캜, .

Thereafter, a ceramic clear coating composition comprising 30% by weight of colloidal silica, 60% by weight of vinyltrimethoxysilane, 0.5% by weight of acetic acid, 6% by weight of methanol, 2% by weight of a thickener and 1.5% And dried at 220 DEG C to form a ceramic transparent coating layer to prepare a color steel plate specimen.

The color steel plate specimens were tested for water resistance, corrosion resistance, and moisture resistance, such as gloss, MEK abrasion, pencil hardness, workability, impact resistance, chemical resistance and durability, and the results are shown in Table 3.

(1) glossy

The gloss evaluation was carried out using REFO 60 glossiness measuring equipment of DRLANGE

(2) MEK abrasion

The MEK abrasion test was carried out by rubbing the gauges 100 times with 1 kgf force after putting the MEK in the gauges, and then evaluating whether or not the resin peeling and swelling occurred. The evaluation criteria are as follows.

Good (O): No occurrence of resin peeling and swelling

Defective (X): resin peeling or swelling occurs

(3) Pencil Hardness

The pencil strength evaluation was performed under the condition of 10 mm / 20 seconds in accordance with JIS K-6301.

(4) Processability

The workability was evaluated by a T-Bend test in which the specimen was bent 180 ° and observed for cracks, cracks, peeling, and the like.

(5) Impact resistance

The impact resistance was evaluated as follows, based on whether or not cracks were generated after the surface impact by dropping the weights under the condition of 1/2? X 1 kg x 50 cm. The evaluation criteria are as follows.

Good (O): No cracks

Bad (X): Cracked

(6) Chemical resistance

The acid resistance evaluation was carried out by dripping 5% HCl in the coating for 24 hours on the test piece, and then visually evaluating the degree of damage of the coating. In addition, the alkali resistance evaluation was performed by dripping the coating film with 5% NaOH for 24 hours, and then washing the coating to evaluate the degree of damage of the coating film. The evaluation criteria are as follows.

Good (O): No film damage

Defective (X): film damage

(7) sea water etc. water

In the aqueous evaluation, the specimens were precipitated in boiling water at 98 ± 2 ° C for 2 hours, taken out and slowly cooled, and then color difference was measured.

(8) Corrosion resistance

The corrosion resistance evaluation was carried out at 35 ° C for 500 hours in a neutral salt spray test, and then peeling, peeling, corrosion of the plated surface, and occurrence of rust were confirmed. The evaluation criteria are as follows.

Good (O): No peeling, peeling, corrosion of plated surface and no rust

Defective (X): peeling, peeling, corrosion of plated surface or rust

(9) Moisture resistance

In the evaluation of moisture resistance, the specimen was left at a temperature of 50 ° C for 500 hours, and the appearance and adhesion were confirmed after removing water. The evaluation criteria are as follows.

Good (O): No film peeling, no peeling

Defective (X): Exfoliation of paint film

Item Zinc-aluminum-magnesium alloy coated steel sheet galvanized steel Polish(%) 75% 72% MEK Rubbing 100 times satisfied: Good 100 times satisfied: Good Pencil hardness 2H 2H Processability 0 to 2T, 4 points
(Coating film cracking and peeling evaluation) 0 to 2T, 4 points
(Coating film cracking and peeling evaluation) Impact Good Good Cross Ericson Test Chemical resistance Good chemical and acid resistance Good chemical and acid resistance Abdominal aquatic 0.1 (? E) 0.1 (? E) Corrosion resistance Good Good Moisture resistance Good Good

According to the above Table 3, both of the zinc-aluminum-magnesium alloy coated steel sheet and the coated steel sheet specimen using the galvanized steel sheet have high gloss, and are excellent in MEK abrasion, pencil hardness, workability, impact resistance, chemical resistance, It was confirmed that all of the results of the wetting test showed good effects.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

1: steel plate
2: The molten plated layer
3: Pretreatment layer
4: Color coating layer
5: Ceramic clear coating layer

Claims (16)

Steel plate;
A molten plated layer formed on at least one surface of the steel sheet;
A pretreatment layer formed on the molten plated layer;
A color coating layer formed on the pretreatment layer; And
And a ceramic transparent coating layer formed on the color coating layer.
The method according to claim 1,
Wherein the molten plated layer is a zinc plated layer, an aluminum plated layer, a zinc-aluminum alloy plated layer, or a zinc-aluminum-magnesium alloy plated layer.
The method according to claim 1,
Wherein the pretreatment layer is a phosphoric acid coating layer, a chromate or a non-chromate coating layer.
The method according to claim 1,
Wherein the pretreatment layer has a thickness of more than 0 and less than or equal to 1 占 퐉.
The method according to claim 1,
Wherein the color coating layer has a thickness of 7 to 15 占 퐉.
The method according to claim 1,
The ceramic transparent coating layer contains 5 to 50% by weight of metal oxide nanosol, 48 to 69% by weight of silane, 0.01 to 1.0% by weight of an acidity control agent, 0.5 to 3.0% by weight of a thickener, 0.1 to 3.0% by weight of a quencher, Wherein said ceramic clear coating composition is obtained by sol-gel reaction.
The method according to claim 6,
Wherein the metal oxide is at least one selected from the group consisting of silica, titania, alumina, zirconia, magnesium oxide, and zinc oxide.
The method according to claim 6,
The silane may be selected from the group consisting of vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tri-isopropoxy silane, 3-methacryloxypropyl trimethoxysilane 3-methacryloxypropyl trimethoxy silane, 2-glycidyloxy propyl trimethoxy silane, 2-glycidyloxy propyl triethoxy silane, 2-amino 2-aminopropyl triethoxy silane, 2-ureidoalkyl triethoxy silane, tetraethoxy silane, methyltrimethoxy silane, tetra Aminopropyltrimethoxy silane (N-beta- (Aminoethyl) -gamma-aminopropyltrimethoxy silane), 3-aminopropyltriethoxy silane (3-aminopropyltriethoxy silane) silane), triethoxy A triethoxyphenyl silane, and a trimethoxyphenyl silane. 2. The flame-retardant colored steel sheet according to claim 1,
The method according to claim 1,
Wherein the ceramic clear coating layer has a thickness of 3 to 5 占 퐉.
Forming a pretreatment layer on the hot-dip coated steel sheet;
Forming a color coating layer on the pretreatment layer; And
And forming a ceramic transparent coating layer on the color coating layer.
11. The method of claim 10,
Wherein the hot-dip coated steel sheet is a galvanized steel sheet, an aluminum coated steel sheet, a zinc-aluminum alloy coated steel sheet, or a zinc-aluminum-magnesium alloy coated steel sheet.
11. The method of claim 10,
Wherein the pretreatment layer is a phosphoric acid coating, a chromate, or a non-chromate coating.
11. The method of claim 10,
Wherein the pretreatment layer has a thickness of more than 0 占 퐉 and 1 占 퐉 or less.
11. The method of claim 10,
Wherein the color coating layer has a thickness of 7 to 15 占 퐉.
11. The method of claim 10,
The ceramic transparent coating layer contains 5 to 50% by weight of metal oxide nanosol, 48 to 69% by weight of silane, 0.01 to 1.0% by weight of an acidity control agent, 0.5 to 3.0% by weight of a thickener, 0.1 to 3.0% by weight of a quencher, Wherein said ceramic clear coating composition is obtained by sol-gel reaction.
11. The method of claim 10,
Wherein the ceramic clear coating layer has a thickness of 3 to 5 占 퐉.

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