KR101715508B1 - Color steel sheet and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a base steel plate; A base coat layer formed on the base steel sheet and comprising a metallic color pigment; And a texture clear layer formed on the undercoat layer and having irregular coarse patterns on the surface, and a method of manufacturing the same. Accordingly, it is an object of the present invention to provide a color steel sheet of metal color which can impart coating film adhesion, coating film impact resistance, coating film hardenability and corrosion resistance even when the thickness of the coating layer is reduced, .

Description

Technical Field [0001] The present invention relates to a color steel sheet and a method of manufacturing the steel sheet.

The present invention relates to a metal color colored steel sheet having irregular coarse patterns on its surface and a method of manufacturing the same.

Color steel plates are increasing in demand for building materials, household appliances, and automobiles. Such a color steel sheet is produced by a method of sequentially forming a pretreatment layer, a subbing layer and a top layer on the surface of a base steel sheet, and usually includes a pigment exhibiting a target color on the upper layer.

Conventionally, there has been proposed a method of mixing metallic color pigments in the upper layer to produce a color steel sheet having a metallic texture. In this case, although the upper layer can realize a metallic color, there is a problem that it is difficult to realize a texture pattern that shows the texture due to the characteristics of the pigment showing the metallic color.

A prior art related to this is Korean Patent Laid-Open Publication No. 2002-0095816.

It is an object of the present invention to provide a color steel sheet which can impart coating film adhesion, coating film impact resistance, coating film hardenability and corrosion resistance even when the thickness of the coating layer is reduced, ≪ / RTI >

One embodiment of the present invention relates to a base steel plate; A base coat layer formed on the base steel sheet and comprising a metallic color pigment; And a texture clear layer formed on the undercoating layer and having irregular coarse patterns formed on the surface thereof.

Wherein the textured clear layer comprises from 65 to 75% by weight of a polyester resin, from 3 to 13% by weight of a melamine resin, from 0.1 to 3% by weight of an inorganic pigment, from 1 to 9% by weight of an amine compound, The composition may be a cured product of a composition for forming a textured clear layer, which comprises 9 wt% to 9 wt%, 1 wt% to 9 wt% of an additive, and 10 wt% to 20 wt% of a solvent.

Wherein the undercoat layer comprises from 58 to 68% by weight of a polyester resin, from 1 to 9% by weight of a melamine resin, from 1 to 9% by weight of an epoxy resin, from 7 to 17% by weight of a metallic color pigment, To 9% by weight of a solvent and 10% to 20% by weight of a solvent.

Wherein the irregular coarse pattern has a flat plate portion having an average diameter of 3 mm to 5 mm; And a reflection part having an average diameter of 1 mm to 4 mm; may be irregularly mixed.

Another embodiment of the present invention is a method of manufacturing a base steel sheet, comprising the steps of: applying a composition for forming a subbing layer including a metallic color pigment on a base steel sheet to form a subbing layer; And applying a composition for forming a texture clear layer on the undercoating layer and curing the composition to form a texture clear layer having irregular coarse patterns on the surface thereof; The present invention relates to a method of manufacturing a color steel plate.

The composition for forming a texture clear layer in the method for producing a color steel sheet according to the present invention comprises 65 to 75 wt% of a polyester resin, 3 to 13 wt% of a melamine resin, 0.1 to 3 wt% of an inorganic pigment, 1 wt% To 9% by weight of acrylic acid, 1 to 9% by weight of acrylic beads, 1 to 9% by weight of additives and 10 to 20% by weight of solvent.

In the method for producing a color steel sheet, the composition for forming the undercoat layer comprises 58 to 68% by weight of a polyester resin, 1 to 9% by weight of a melamine resin, 1 to 9% by weight of an epoxy resin, 17 wt%, 1 wt% to 9 wt% of an additive and 10 wt% to 20 wt% of a solvent.

In the method for manufacturing a color steel sheet, the composition for forming a texture clear layer may have a viscosity of 100 m ² / sec to 120 m ² / sec and a specific gravity of 1.0 to 1.10, Followed by drying at a production rate of 60 m / min to 70 m / min and a peak metal temperature (PMT) of 210 ° C to 240 ° C for 20 seconds to 50 seconds.

In the method for manufacturing a color steel sheet, the irregular coarse pattern may be a flat plate having an average diameter of 3 mm to 5 mm; And a reflection part having an average diameter of 1 mm to 4 mm; may be irregularly mixed.

The present invention provides a color steel sheet of metal color that can impart coating film adhesion, coat film impact resistance, coating film hardenability, and corrosion resistance even when the thickness of the coating layer is reduced, and at the same time, .

1 is a sectional view of a color steel sheet according to an embodiment of the present invention.
Fig. 2 is a photograph of the surface of a color steel sheet produced according to Example 1. Fig.
3 is a photograph of the surface of a color steel sheet produced according to Comparative Example 1. Fig.

One embodiment of the present invention relates to a base steel plate; A base coat layer formed on the base steel sheet and comprising a metallic color pigment; And a texture clear layer formed on the undercoating layer and having irregular coarse patterns formed on the surface thereof.

Hereinafter, a color steel sheet according to an embodiment of the present invention will be described in detail with reference to FIG. 1, which shows a color steel sheet of one embodiment of the present invention.

The color steel sheet of one embodiment includes a base steel sheet 101, a lower layer 120, and a texture clear layer 130.

The base steel plate 101 is not particularly limited, but may be a steel plate for which a mechanical property and decorative property of a steel plate such as a sliding door, a fire door, and a building material panel must be simultaneously realized. In such a case, the color steel sheet may have a more economical effect.

The base steel sheet 101 may be, for example, a hot-rolled steel sheet or a cold-rolled steel sheet, and may be a sheet having a thickness of 0.2 mm to 1 mm. In this case, the color steel sheet can be more excellent in productivity.

The base steel sheet 101 may include a plating layer 102 formed on the surface thereof. Such a plating layer may include zinc, aluminum, nickel, and the like. The steel sheet on which such a plated layer is formed may include, for example, a hot-dip galvanized steel sheet (GI steel sheet), a galvannealed galvanized steel sheet (GA steel sheet), an electrogalvanized steel sheet (EG steel sheet)

A pretreatment layer 110 may be additionally formed on the base steel sheet. In addition, the pretreatment layer 110 can be omitted.

The color steel sheet of one embodiment sequentially includes a lower layer 120 and a texture clear layer 130 on the upper portion of the base steel sheet 101.

The undercoat layer 120 imparts hue, rust resistance, and corrosion resistance to the color steel sheet and improves the adhesion between the base steel sheet 101 and the texture clear layer 120 to improve the coating film adhesion of the colored steel sheet, Thereby improving the hardenability and corrosion resistance.

The undercoat layer 120 can be obtained by applying a composition for forming a undercoat layer on a base steel sheet 101 to form a coating layer and then curing the coating layer.

Wherein the composition for forming the undercoat layer comprises 58 to 68% by weight of a polyester resin, 1 to 9% by weight of a melamine resin, 1 to 9% by weight of an epoxy resin, 7 to 17% by weight of a metallic color pigment, 1 wt% to 9 wt% and solvent 10 wt% to 20 wt%. Such a composition for forming a primer layer can form a primer layer having excellent workability and coating property, color reproducibility, rust resistance and corrosion resistance, and excellent adhesion to the base steel sheet 101 and the texture clear layer 120 .

In addition, the undercoat layer formed by curing the composition for forming a undercoat layer having the above composition is excellent in coatability and adhesion, and at the same time, it can exhibit hue. Even when the overcoat layer is omitted, excellent adhesion to the coating film, And corrosion resistance can be imparted. In this case, since the thickness of the coating layer formed on the color steel sheet can be reduced, the light weight and workability are excellent, and the 2PASS process for forming the upper layer and the lower layer can be performed in a single process.

The polyester resin, the melamine resin and the epoxy resin contained in the undercoat layer-forming composition function together as a binder resin. In this case, the undercoating layer is excellent in adhesion between the base steel sheet 101 and the texture clear layer 120.

The composition for forming the undercoat layer may contain, for example, from 60% by weight to 65% by weight of the polyester resin in the composition for forming the entire undercoat layer. In this case, the viscosity of the undercoat layer-forming composition is excellent, workability and coatability can be improved, and the undercoat layer can be improved in hardenability. In the above range, the composition for forming a undercoat layer is excellent in color development due to a metal color pigment described later, and has excellent metal reflectivity, so that a more excellent appearance can be realized.

 The composition for forming the subbing layer may comprise, for example, 1 to 5% by weight of a melamine resin in the composition for forming a whole subbing layer. In this case, the composition for forming the undercoating layer can further improve the uniformity and curability of the coating layer after application.

 The undercoat layer-forming composition may contain, for example, 3 to 9% by weight of an epoxy resin in the entire undercoat layer-forming composition. In this case, the undercoat layer-forming composition may have excellent curing properties and adhesion.

The undercoat layer forming composition may be used in a weight ratio of, for example, 6 to 8: 1 to 2: 1 to 2, for example, a polyester resin, a melamine resin and an epoxy resin. In this case, the composition for forming the undercoating layer can further improve workability and coatability, and the hardenability, adhesion and adhesion of the undercoat layer can be improved.

The composition for forming the subbing layer comprises a metallic color pigment. This provides a metallic color surface on the undercoat layer. Such a metallic color surface works in combination with the texture clear layer, so that the appearance of a luxurious metal can be realized.

In the above range, the composition for forming a undercoat layer is excellent in color development due to a metal color pigment described later, and has excellent metal reflectivity, so that a more excellent appearance can be realized.

The metallic color pigment is not particularly limited and may be, for example, a silver color pigment or a gold color pigment. In this case, not only the metallic color pigment is excellent in shielding but also the shielding property and reflectivity are high, so that a more excellent appearance can be realized.

The metallic color pigment may include, for example, 10 to 15% by weight of an epoxy resin in the entire undercoat layer forming composition. In this case, the undercoat layer is excellent in shielding property and color reproducibility, and is more excellent in reflectivity and gloss, so that it works in combination with the texture clear layer, so that the appearance of a metal similar to that of a more luxurious metal can be realized .

The composition for forming the subbing layer includes an additive. This makes it possible to improve the workability and curability of the undercoat layer-forming composition and further improve the compatibility between the respective components.

The additive may include, for example, a defoaming agent and an acid catalyst. In this case, since pores are not generated in the undercoating layer, the uniformity is excellent, and the corrosion resistance of the colored steel sheet, the film adhesion, the impact resistance of the coating film, and the coating film hardening degree can be further improved.

The antifoaming agent and the acid catalyst may include, for example, such that the total amount of the antifoaming agent and the acid catalyst in the composition for forming the entire undercoat layer is 2 wt% to 9 wt%. This makes it possible to further improve the curability of the composition for forming the undercoat layer, and further improve the corrosion resistance, the film adhesion, the film impact resistance and the coating film hardness of the colored steel sheet.

The undercoat layer-forming composition includes a solvent. This makes it possible to improve the coatability, workability and adhesion of the undercoat layer-forming composition, and further improve the compatibility between the respective components.

The solvent may include, for example, at least one of an alcohol-based solvent, a ketone-based solvent, and an aromatic naphtha-based solvent. In this case, the drying speed of the undercoat layer can be shortened, and the compatibility and adhesion with the texture clear layer can be further improved.

The texture clear layer 130 is formed with an irregular coarse pattern on its surface, and protects the surface of the colored steel plate and realizes a decorative property showing a luxurious appearance.

Specifically, the irregular coarse pattern has a flat plate portion having an average diameter of 3 mm to 5 mm; And a reflection part having an average diameter of 1 mm to 4 mm; may be irregularly mixed. Accordingly, the texture clear layer 130 realizes more excellent luster even when the metal color of the underlayer is displayed on the surface through the plate portion, and the metal color of the underlayer is diffused through the reflector to realize a colorful appearance.

The texture clear layer 130 may be applied to the top of the undercoat layer 120 to form a coating layer by applying a composition for forming a texture clear layer, and then curing the coating layer.

Wherein the composition for forming a textured clear layer comprises 65 wt% to 75 wt% of a polyester resin, 3 wt% to 13 wt% of a melamine resin, 0.1 wt% to 3 wt% of an inorganic pigment, 1 wt% 1% to 9% by weight of acrylic beads, 1% to 9% by weight of additives, and 10% to 20% by weight of a solvent.

As a result, a texture clear layer (not shown) in which an irregular coarse pattern (for example, a flat plate portion having an average diameter of 3 mm to 5 mm and a reflecting portion having an average diameter of 1 mm to 4 mm) 130), and it is possible to provide a cosine pattern having a shape in which an average diameter is formed to be much larger than that of a conventional one. In addition, the composition for forming a texture clear layer having such a composition is not only excellent in workability, but also has an excellent effect of protecting the surface of a colored steel plate.

The polyester resin and the melamine resin contained in the composition for forming a texture clear layer function together as a binder resin. In this case, the texture clear layer 130 is excellent in adhesion to the undercoat layer 120.

The composition for forming a texture clear layer may contain, for example, from 68% by weight to 73% by weight of a polyester resin in the composition for forming an entire texture clear layer. In this case, the viscosity of the composition for forming a texture clear layer is excellent and workability and coatability can be improved, and the texture clear layer can be improved in curability and surface gloss. In the above-mentioned range, the composition for forming a texture clear layer has excellent color reproducibility and metallic reflectivity by the metallic color pigment of the undercoat layer, so that a more excellent appearance can be realized.

 The composition for forming a texture clear layer may contain, for example, 8 to 12% by weight of a melamine resin in the composition for forming the entire texture clear layer. In this case, the composition for forming a texture clear layer not only can further improve the uniformity and curability of the coating layer after coating, but also functions in combination with the amine compound and the acrylic beads to be described later, .

 The composition for forming the texture clear layer may be used in a weight ratio of, for example, 5: 1 to 15: 1, for example, a polyester resin and a melamine resin. In this case, the composition for forming a texture clear layer can realize a more excellent surface protection and a coarsen pattern of a coarse appearance.

The composition for forming a texture clear layer includes an inorganic pigment. As a result, the color of the texture clear layer is more variously realized, and the glossiness and reflectivity are further absorbed by the metal appearance.

The inorganic pigment is not particularly limited and may be, for example, an inorganic pigment containing silicon dioxide. In this case, some degree of opacity can be implemented to achieve a gentle yet elegant appearance while transmitting the color reflected from the underlayer to the surface.

The inorganic pigment may include, for example, 0.5 wt% to 1.5 wt% of an inorganic pigment in the entire composition for forming a texture clear layer. In this case, the balance of transparency and opacity of the texture clear layer is more excellent, so that the appearance of a metal similar to that of a more luxurious metal can be realized.

The texture clear layer composition includes an amine compound and acrylic beads, and acts in combination with the melamine resin described above to realize a cosine pattern on the texture clear layer.

The amine compound reacts with acrylic beads by heat during the drying process and can be cured with a better bonding force. This results in nonuniformity of the artificial shrinkage force in the texture clear layer composition and non-uniformity of the curing time. As a result, a more excellent appearance can be realized by forming the gloss portion and the reflection portion of the above-described coaxial pattern. In addition, the above-mentioned melamine resin further increases the difference in the degree of curing, thereby realizing a coaxial pattern having a more uneven and coarse diameter.

As described above, the acrylic beads act chemically with the amine compound and the melamine resin to form a coacene pattern, and physically use the properties of the beads to induce thickness irregularity, curing speed, and drying speed difference It implements a coaxial pattern with irregular and coarse diameters.

The texture clear layer composition may comprise, for example, from 3 wt% to 8 wt% of an amine compound in the texture clear layer composition and from 1 wt% to 7 wt% of acorn beads. In this case, it is possible to realize a coaxial pattern having a more excellent appearance.

The weight ratio of the amine compound and the acrylic beads in the texture clear layer composition may be, for example, 1: 0.5 to 1: 2. In this case, it is possible to realize a coaxial pattern having a more excellent appearance.

The texture clear layer composition comprises an additive. As a result, the workability and curability of the composition for forming a texture clear layer can be improved and the compatibility between the respective components can be further improved.

The additive may include, for example, a defoaming agent and an acid catalyst. In this case, the corrosion resistance of the colored steel sheet, the coating film adhesion, the impact resistance of the coating film, and the coating film hardening degree can be further improved.

The antifoaming agent and the acid catalyst may include, for example, such that the sum of the antifoaming agent and the acid catalyst in the entire texture clear layer composition is 2 wt% to 9 wt%. This makes it possible to further improve the curability of the composition for forming a texture clear layer, and further improve the corrosion resistance, film adhesion, film impact resistance and coating film hardness of the colored steel sheet.

The composition for forming a texture clear layer includes a solvent. This makes it possible to improve the coatability, workability and adhesion of the undercoat layer-forming composition, and further improve the compatibility between the respective components.

The solvent may include, for example, two or more kinds of alcohol-based solvents, ketone-based solvents and aromatic naphtha-based solvents having different boiling points. In this case, the drying speed of the texture clear layer can be shortened, and the compatibility and adhesion of the undercoat layer can be further improved. In addition, by using two or more kinds of solvents having different boiling points, the action of shrinkage and drying can be promoted to realize a cosecent pattern of a more excellent appearance. The solvent may be, for example, a mixture of a first solvent having a boiling point of 100 ° C to 150 ° C and a second solvent having a boiling point of 120 ° C to 200 ° C. In this case, the solvent having a low boiling point evaporates first, and the solvent having a high boiling point evaporates later, thereby promoting the effect of partially differentiating the hardening speed of the texture clear layer, thereby realizing a more excellent appearance of the texture clear layer .

Another embodiment of the present invention is a method of manufacturing a base steel sheet, comprising the steps of: applying a composition for forming a subbing layer including a metallic color pigment on a base steel sheet to form a subbing layer; And applying a composition for forming a texture clear layer on the undercoating layer and curing the composition to form a texture clear layer having irregular coarse patterns on the surface thereof; The present invention relates to a method of manufacturing a color steel plate.

In the method for producing a color steel sheet of the present invention, the description of the base steel sheet, the composition for forming the undercoat layer and the composition for forming the texture clear layer is as described above. In addition, the base steel sheet, the composition for forming the undercoat layer, and the method for producing the composition for forming the texture clear layer may follow the conventional methods used in the related art, and are not particularly limited.

In one method of manufacturing a color steel sheet, a base layer is formed by applying a composition for forming a base layer including a metal color pigment on a base steel sheet.

The composition for forming the undercoat layer may include, for example, adjusting the viscosity of the undiluted cup to be 100 m ² / sec to 120 m ² / sec and the specific gravity to be 1.0 to 1.10. In this case, not only the workability is excellent, but also a coaxial pattern with a larger size can be realized.

The composition for forming the undercoat layer is applied to a base steel sheet to form a undercoat layer and dried at a production rate of 60 m / min to 70 m / min and a peak metal temperature (PMT) of 210 to 240 ° C for 20 seconds to 50 seconds .

The composition for forming the undercoat layer may be applied so that the thickness of the undercoat layer after drying is 10 탆 to 20 탆. In this case, the workability, corrosion resistance and adhesion of the color steel sheet can be further improved.

In the method of manufacturing a color steel sheet according to one embodiment, a composition for forming a texture clear layer is applied to an upper portion of a lower layer formed by the above method to form a texture clear layer having a corse pattern.

Wherein the composition for forming a texture clear layer has a viscosity of 100 m ² / sec to 120 m ² / sec and a specific gravity of 1.0 to 1.10, and the step of forming the texture clear layer comprises the step of applying the composition for forming a texture clear layer And then dried at a production rate of 60 m / min to 70 m / min and a peak metal temperature (PMT) of 210 ° C to 240 ° C for 20 seconds to 50 seconds. In this case, the curing speed difference and the bonding force difference of the components included in the texture clear layer are further increased, so that a coaxial pattern having a more excellent appearance can be realized. In this case, the flat portion having a coarse pattern having an average diameter of 3 mm to 5 mm; And a reflection part having an average diameter of 1 mm to 4 mm are advantageously formed in irregularly mixed forms. Further, in such a case, the texture clear layer can have high brittleness and high gloss.

The composition for forming a texture clear layer may be applied so that the thickness of the texture clear layer becomes 5 to 20 占 퐉 after drying. In this case, the appearance of the colored steel sheet is excellent, and the workability can be further improved.

Example

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example  One

The undercoating layer was formed on the hot-dip galvanized steel sheet by applying the composition for forming the undercoat layer, followed by drying at 224 ° C for 20 seconds at a production rate of 60 m / min to form a subbing layer having a thickness of 15 탆. Then, a composition for forming a texture clear layer was coated on the undercoating layer and dried at 241 캜 for 30 seconds at a production rate of 60 m / min to form a 10 탆 -thick texture clear layer having a corse pattern.

The composition for forming the undercoat layer was prepared by mixing 58 wt% of a polyester resin, 2 wt% of a melamine resin, 5 wt% of an epoxy resin, 15 wt% of a metallic color pigment (silver), 2.5 wt% of an antifoaming agent, 2.5 wt% Were mixed and stirred.

The composition for forming the textured clear layer was prepared by mixing 65 wt% of polyester resin, 5 wt% of melamine resin, 1 wt% of inorganic pigment (silicon dioxide), 5 wt% of amine compound, 5 wt% of acrylic beads, 5 wt%, aromatic naphtha 5 wt%, and cyclohexanone 5 wt% were mixed and stirred.

Comparative Example  One

The undercoating layer was formed on the hot-dip galvanized steel sheet by applying the composition for forming the undercoat layer, followed by drying at 224 ° C for 20 seconds at a production rate of 60 m / min to form a subbing layer having a thickness of 15 탆. Thereafter, the composition for forming an upper layer was applied on the lower layer in the same manner and dried to form an upper layer having a thickness of 15 탆.

The composition for forming the undercoat layer was prepared by mixing and stirring 60 wt% of a polyester resin, 10 wt% of an epoxy resin, 2.5 wt% of an antifoamer, 2.5 wt% of an acid catalyst and 25 wt% of ethanol.

The composition for forming an upper layer was prepared by mixing 50 wt% of a polyester resin, 10 wt% of a melamine resin, 2.5 wt% of an antifoamer, 2.5 wt% of an acid catalyst, 10 wt% of a metallic color pigment (silver) and 15 wt% .

≪ Evaluation of physical properties &

The properties of the color steel plate specimens prepared according to Example 1 and Comparative Example 1 were evaluated by the following methods.

 (1) Processability

The T-bending test was carried out to determine whether the bending radius of the specimen occurred at twice the specimen thickness.

Good (O): No cracks

Bad (X): Cracked

 (2) Coating film adhesion (adhesion)

The film adhesion was evaluated by cross-cutting 10 lines at a distance of 1mm width x 1mm on a flat sample coated with paints, making 100 squares with an area of 1mm ² , then further cutting the cross- Erickson processing), and finally, when the adhesive tape was attached, the peeling of 100 pieces of the coating film particles was evaluated as follows.

Good (O): No peeling of the cross cutting part coating film

Defect (X): Peeling of the cross cutting part

 (3) Impact resistance

The impact resistance was evaluated by whether or not a crack occurred after the surface impact by dropping the weights under the condition of 1/2? X 1 kg x 500 mm.

Good (O): No cracks

Bad (X): Cracked

 (4) Coating hardness

The coating film hardness was evaluated by evaluating whether the resin was peeled or swollen after rubbing 50 times with 1 kgf force after MEK was applied to the gauze.

Good (O): No resin peeling or swelling

Defective (X): resin peeling or swelling occurs

(5) Corrosion resistance

The corrosion resistance of the specimens was evaluated by X-cutting after a 500-hour neutral salt spray test. The results showed that the coating was peeled off, the corrosion of the plated surface, the rust formation, and the blister size. The evaluation criteria are as follows.

Good (O): Peeling of coating film, corrosion of plated surface, no rust, blister 3 mm or less

Defective (X): Exfoliation of coating film, peeling, corrosion of plated surface or rusting, blister exceeding 3mm

≪ Property evaluation result >

The results of physical property evaluation based on the above evaluation criteria are shown in Table 1 below.

Processability Coating film adhesion Impact resistance Coating hardness Corrosion resistance Pattern presence Example 1 ○ ○ ○ ○ ○ ○ Comparative Example 1 × × × × × ×

In addition, the surface patterns of the color steel plate specimens prepared in Example 1 and Comparative Example 1 were photographed, and the results of Example 1 and Comparative Example 1 are shown in FIG. 2 and FIG. 3, respectively.

As a result, it was confirmed that the color steel sheet of Example 1 provided a pattern having a greater glossiness than that of Comparative Example 1.

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 embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of protection of the present invention should be defined by the following claims.

101: base steel plate
102: Plating layer
120: Lower layer
130: Texture clear layer

Claims (8)

Base steel plate;
A base coat layer formed on the base steel sheet and comprising a metallic color pigment; And
And a texture clear layer formed on the undercoat layer and having irregular coarse patterns on the surface,
Wherein the textured clear layer comprises from 65 to 75% by weight of a polyester resin, from 3 to 13% by weight of a melamine resin, from 0.1 to 3% by weight of an inorganic pigment, from 1 to 9% by weight of an amine compound, A cured product of a composition for forming a texture clear layer, wherein the cured product is a composition for forming a texture clear layer, the cured product comprising a weight% to 9 wt%, an additive 1 wt% to 9 wt%, and a solvent 10 wt%
Wherein the undercoat layer comprises from 58 to 68% by weight of a polyester resin, from 1 to 9% by weight of a melamine resin, from 1 to 9% by weight of an epoxy resin, from 7 to 17% by weight of a metallic color pigment, To 9% by weight of a solvent and 10% by weight to 20% by weight of a solvent,
Wherein the irregular coarse pattern has a flat plate portion having an average diameter of 3 mm to 5 mm; And a reflection part having an average diameter of 1 mm to 4 mm are irregularly mixed.
delete delete delete Applying a composition for forming a subbing layer including a metallic color pigment on a base steel sheet to form a subbing layer; And
Applying a composition for forming a texture clear layer on the undercoat layer, and curing the composition to form a texture clear layer having irregular coarse patterns on the surface; Lt; / RTI >
Wherein the composition for forming a textured clear layer comprises 65 wt% to 75 wt% of a polyester resin, 3 wt% to 13 wt% of a melamine resin, 0.1 wt% to 3 wt% of an inorganic pigment, 1 wt% 1 to 9% by weight of acrylic beads, 1 to 9% by weight of additives and 10 to 20% by weight of a solvent,
Wherein the composition for forming the undercoat layer comprises 58 to 68% by weight of a polyester resin, 1 to 9% by weight of a melamine resin, 1 to 9% by weight of an epoxy resin, 7 to 17% by weight of a metallic color pigment, 1% to 9% by weight of a solvent and 10% to 20% by weight of a solvent,
Wherein the composition for forming a texture clear layer has an undiluted viscosity of 100 m ² / sec to 120 m ² / sec, a specific gravity of 1.0 to 1.10,
The forming of the texture clear layer may be performed by applying the composition for forming a texture clear layer to the substrate at a production rate of 60 m / min to 70 m / min, a PMT (Peak Metal Temperature) of 210 to 240 ° C for 20 to 50 seconds Lt; RTI ID = 0.0 >
Wherein the irregular coarse pattern has a flat plate portion having an average diameter of 3 mm to 5 mm; And a reflection part having an average diameter of 1 mm to 4 mm are irregularly mixed.

delete delete delete

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