KR20190018970A - Color steel sheet and manufacturing method thereof - Google Patents

Abstract

Disclosed are a color steel plate and a manufacturing method thereof. According to an embodiment of the present invention, the color steel plate comprises: a base steel plate; a base layer formed on a surface of the base steel plate; and a semi-transparent clear layer formed on the surface of the base layer, and having embossed uneven patterns formed on a surface thereof. The base layer includes 100 parts by weight of a polyester resin, 5 to 25 parts by weight of an epoxy resin, 5 to 35 parts by weight of a melamine resin, and 0.01 to 80 parts by weight of a first pigment. The semi-transparent clear layer includes 100 parts by weight of a polyester resin, 5 to 35 parts by weight of a melamine resin, 0.1 to 15 parts by weight of a second pigment, and 0.5 to 15 parts by weight of a pattern former. The pattern former includes first, second, and third pattern formers, wherein the first pattern former includes an amine-based compound, silica, and an acrylate-based compound, the second pattern former includes a sulfonic acid compound, aluminum chloride and zeolite, and the third pattern former includes polyolefin wax.

Description

COLOR STEEL SHEET AND METHOD OF MANUFACTURING METHOD THEREOF Technical Field [1]

The present invention relates to a colored steel sheet and a manufacturing method thereof. More particularly, the present invention relates to a mat type color steel sheet which is excellent in adhesion to a base material and can realize a superior aesthetic feeling by implementing a discoloration effect depending on a specific color and angle, and a method of manufacturing the same.

In order to impart corrosion resistance and aesthetic characteristics, the surface of the steel sheet is coated with a coating composition or a laminate film or the like is referred to as a color steel sheet. In recent years, the color steel sheet has been in increasing demand for building materials, household appliances and automobiles. Such a color steel sheet is manufactured by sequentially forming a pretreatment layer, a primer layer, and a top layer on the surface of a base steel sheet, and is manufactured by applying a pigment for achieving a target color to the top layer.

BACKGROUND ART [0002] The background art relating to the present invention is disclosed in Korean Patent Laid-Open Publication No. 2013-0026930 (published on Mar. 13, 2013, entitled Color Steel Sheet Having Three-Dimensional Texture and Its Manufacturing Method).

According to one embodiment of the present invention, there is provided a color steel sheet excellent in surface texture.

According to an embodiment of the present invention, there is provided a colored steel sheet which is mixed with colors of a undercoat layer and a semitransparent topcoat layer to realize a discoloration effect according to a specific color and angle, and can realize an excellent aesthetic feeling.

According to one embodiment of the present invention, there is provided a colored steel sheet excellent in coating film adhesion, impact resistance, coating film hardenability and corrosion resistance.

According to an embodiment of the present invention, there is provided a method of manufacturing the color steel sheet.

One aspect of the present invention relates to a color steel plate. In one embodiment, the colored steel plate comprises: a base steel plate; A base layer formed on the surface of the base steel sheet; And a semitransparent clear layer formed on the surface of the undercoat layer and having a relief pattern formed on the surface thereof, wherein the undercoat layer comprises 100 parts by weight of a polyester resin, 5 to 25 parts by weight of an epoxy resin, 5 to 35 parts by weight of a melamine resin Wherein the translucent clear layer comprises 100 parts by weight of a polyester resin, 5 to 35 parts by weight of a melamine resin, 0.1 to 15 parts by weight of a second pigment and 0.5 to 15 parts by weight of a pattern forming agent Wherein the pattern forming agent comprises a first pattern forming agent, a second pattern forming agent, and a third pattern forming agent, wherein the first pattern forming agent comprises an amine compound, silica and an acrylate compound , The second pattern forming agent comprises an organic sulfonic acid compound, aluminum chloride (AlCl ₃ ) and a zeolite, and the third pattern forming agent comprises a polyolefin wax.

In one embodiment, the pattern forming agent comprises 0.1 to 3 parts by weight of the first pattern forming agent, 0.3 to 10 parts by weight of the second pattern forming agent and 0.1 to 3 parts by weight of the third pattern forming agent per 100 parts by weight of the polyester resin Parts by weight.

In one embodiment, the first pigment is selected from the group consisting of silica, carbon black, iron oxide, titanium oxide (TiO ₂ ), antimony (Sb), quinacridone, copper-phthalocyanine copper-phthalocyanine, and chromium (Cr), wherein the second pigment comprises at least one of a multi-color pigment and a metal oxide coated mica, the metal oxide-coated silicon oxide (SiO _2), titanium oxide may include one or more of (TiO ₂₎ and tin oxide (SnO).

In one embodiment, the second pigment comprises 0.1 to 13 parts by weight of silicon oxide (SiO ₂ ) coated with a metal oxide and 0.1 to 3 parts by weight of mica coated with a metal oxide, based on 100 parts by weight of the polyester resin can do.

Another aspect of the present invention relates to a method of manufacturing the color steel sheet. In one embodiment, the method for manufacturing a color steel sheet includes the steps of forming a primer layer by applying and drying a primer layer on a surface of a base steel sheet; And forming a translucent clear layer on the surface of the undercoat layer by applying a translucent clear layer forming agent on the surface of the undercoat layer and forming a concave / convex pattern on the surface, wherein the undercoat layer forming agent comprises 100 parts by weight of a polyester resin 5 to 25 parts by weight of an epoxy resin, 5 to 35 parts by weight of a melamine resin, 0.01 to 80 parts by weight of a first pigment and 20 to 90 parts by weight of a solvent, wherein the translucent clear layer forming agent comprises 100 parts by weight of a polyester resin, 5 to 35 parts by weight of a resin, 0.1 to 15 parts by weight of a second pigment, 0.5 to 15 parts by weight of a pattern forming agent and 30 to 100 parts by weight of a solvent, wherein the pattern forming agent comprises a first pattern forming agent, And a third pattern forming agent, wherein the first pattern forming agent comprises an amine compound, silica and an acrylate compound, and the second pattern forming agent comprises an organic sulfonic acid compound, aluminum chloride and zeolite, Then, The third pattern forming agent comprises a polyolefin wax.

In one embodiment, the first pigment is selected from the group consisting of silica, carbon black, iron oxide, titanium oxide (TiO ₂ ), antimony (Sb), quinacridone, copper-phthalocyanine copper-phthalocyanine, and chromium (Cr), wherein the second pigment comprises at least one of a multi-color pigment and a metal oxide coated mica, the metal oxide-coated silicon oxide (SiO _2), titanium oxide may include one or more of (TiO ₂₎ and tin oxide (SnO).

The undercoating layer-forming agent. In one embodiment the ^{viscosity: 100 ~ 120 m 2 / sec} , a solid content: 56-62% by weight and a specific gravity: is 1.0 to 1.2, wherein the transparent clear layer-forming agent has a viscosity: 100 ~ 120 m ² / sec, a solid content of 56 to 65 wt%, and a specific gravity of 1.1 to 1.3.

In one embodiment, the semitransparent clear layer may be formed by drying the coated semitransparent clear layer forming agent at a temperature of from 210 to 240 ° C for 20 to 50 seconds.

The color steel sheet of the present invention is excellent in surface texture and is capable of realizing a special color such as multi-color by mixing the colors of the undercoat layer and the semi-transparent top layer, It is excellent in aesthetic sense, and has excellent film adhesion, impact resistance, coating film hardenability and corrosion resistance, and can be applied not only as an exterior material for a building but also as an interior decoration material and an interior material for a building.

1 shows a method of manufacturing a color steel sheet according to one embodiment of the present invention.
2 shows a color steel sheet according to one embodiment of the present invention.
3 is a photograph showing the results of evaluation of physical properties of a color steel sheet according to an embodiment of the present invention.
4 is a photograph showing the surface texture of a color steel sheet according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to be exemplary, self-explanatory, allowing for equivalent explanations of the present invention.

Color steel plate  Manufacturing method

One aspect of the present invention relates to a method of manufacturing a color steel plate. In one embodiment, the color steel sheet manufacturing method includes: (S10) forming a lower layer; And (S20) a translucent clear layer forming step. More specifically, the method for manufacturing a color steel sheet includes the steps of: (S10) applying and drying a undercoating layer on a surface of a base steel sheet to form a undercoating layer; And (S20) applying and drying a translucent clear layer forming agent on the surface of the undercoat layer to form a translucent clear layer having a relief pattern on the surface.

Hereinafter, the method of manufacturing a color steel sheet according to the present invention will be described step by step.

(S10) Bottom layer  Forming step

The above step is a step of forming a primer layer by applying and drying a primer layer-forming agent on the surface of a base steel sheet.

In one embodiment, the base steel sheet may be a hot-rolled steel sheet or a cold-rolled steel sheet having a thickness of 0.2 to 3 mm. In one embodiment, a plating layer may be further formed on the surface of the base steel sheet to improve corrosion resistance. In one embodiment, the plating layer may include at least one of zinc (Zn), aluminum (Al), and nickel (Ni). In one embodiment, the base steel sheet on which the plating layer is formed includes a hot-dip galvanized steel sheet (GI steel sheet), a galvannealed galvanized steel sheet (GA steel sheet), and an electrogalvanized steel sheet (EG steel sheet).

In one embodiment, a pretreatment layer may be further formed on the surface of the plating layer formed on the base steel sheet. The pretreatment layer serves to improve the corrosion resistance and improve adhesion between the base steel sheet and the paint. In one embodiment, the pretreatment layer is formed by applying a chromium (chromate) or non-chrome pretreatment agent to the surface of the base steel sheet, heating the base steel sheet temperature to 80 to 120 ° C, To 2 탆 thick. For example, when a chromate pretreatment agent is used, it can be formed to a thickness of 0.1 to 0.3 탆, and when a non-chrome type pretreatment agent is used, it can be formed to a thickness of 0.1 to 1 탆.

In one embodiment, the pretreatment layer may be formed to a thickness of 0.1 to 0.3 탆 when a chrome-type pretreatment agent is used. In another embodiment, the pretreatment layer may be formed to a thickness of 0.1 to 1 m when a non-chrome type pretreatment agent is used. The above thickness can be excellent in the corrosion resistance and adhesion of the present invention.

Bottom layer Formulator

The undercoat layer forming agent includes a polyester resin, an epoxy resin, a melamine resin, a first pigment and a solvent. For example, the undercoat layer forming agent includes 100 parts by weight of a polyester resin, 5 to 25 parts by weight of an epoxy resin, 5 to 35 parts by weight of a melamine resin, 0.01 to 80 parts by weight of a first pigment, and 20 to 90 parts by weight of a solvent. Hereinafter, the components of the undercoat layer forming agent will be described in more detail.

Polyester resin

The polyester resin corresponds to a main component for forming the primer layer.

Epoxy resin

The epoxy resin is included to improve the adhesion of the primer layer of the present invention and to improve the mechanical strength of the coating film. In one embodiment, the epoxy resin is included in an amount of 5 to 25 parts by weight based on 100 parts by weight of the polyester resin. When the epoxy resin is contained in an amount of less than 5 parts by weight, the adhesive force is decreased. When the epoxy resin is contained in an amount exceeding 25 parts by weight, the compatibility and workability of the underlayer forming agent may be deteriorated.

Melamine resin

The melamine resin is included for the purpose of securing physical properties such as curing and adhesion of the polyester resin. In one embodiment, the melamine resin is included in an amount of 5 to 35 parts by weight based on 100 parts by weight of the polyester resin. When the melamine resin is contained in an amount of less than 5 parts by weight, the curability and adhesiveness are lowered, the mechanical strength of the undercoat layer is lowered, and when the amount exceeds 35 parts by weight, some unreacted melamine resin remains, .

The first pigment

The first pigment is included in a special color, in which colors of a semitransparent clear layer and a subbing layer are mixed to realize a base color.

The first pigments, silica (SiO _2, silica), and carbon black (carbonblack), iron oxide (iron oxide), titanium oxide (TiO _2), antimony (Sb), quinacridone (quinacridone) In one embodiment, And may include at least one of copper-phthalocyanine and chromium (Cr).

The first pigment may be selected variously according to a desired color. In one embodiment, the first pigment may comprise silica and carbon black in a black color. In another embodiment, the first pigment may comprise silica, carbon black, iron oxide, titanium oxide and antimony in a brown color. In another embodiment, the first pigment may comprise silica, titanium oxide, carbon black and quinacridone in a red color. In another embodiment, the first pigment may comprise silica, titanium oxide, carbon black, and copper-phthalocyanine in a blue color. In another embodiment, the first pigment may comprise silica, carbon black, iron oxide, titanium oxide, and chromium in a gray color. When the first pigment containing the above-mentioned component is applied, it is excellent in gloss and aesthetics, and a differentiated color can be realized.

In one embodiment, the first pigment may be included in an amount of 0.01 to 80 parts by weight based on 100 parts by weight of the polyester resin. When the amount of the first pigment is less than 0.01 part by weight, it is difficult to realize a desired color. When the amount of the first pigment is more than 80 parts by weight, the mixability and workability of the undercoat layer forming agent are lowered, and the mechanical strength of the undercoat layer have.

In one embodiment, the first pigment may include 0.5 to 5 parts by weight of silica and 0.1 to 5 parts by weight of carbon black based on 100 parts by weight of the polyester resin. Under this condition, a subbing layer having a black color can be formed.

In another embodiment, the first pigment may include 0.5 to 5 parts by weight of silica and 10 to 70 parts by weight of carbon black, iron oxide, titanium oxide and antimony, based on 100 parts by weight of the polyester resin. Under these conditions, a ground layer having a brown color can be formed.

In still another embodiment, the first pigment may include 0.5 to 5 parts by weight of silica and 5 to 50 parts by weight of titanium oxide, carbon black and quinacridone based on 100 parts by weight of the polyester resin. Under these conditions, a primer layer having a red color can be formed.

In another embodiment, the first pigment may include 0.5 to 5 parts by weight of silica and 5 to 50 parts by weight of titanium oxide, carbon black, and copper-phthalocyanine based on 100 parts by weight of the polyester resin. Under the above conditions, a subbing layer having a blue color can be formed.

In still another embodiment, the first pigment may include 0.5 to 5 parts by weight of silica and 20 to 70 parts by weight of carbon black, iron oxide, titanium oxide, and chromium based on 100 parts by weight of the polyester resin. Under this condition, a subbing layer having a gray color can be formed.

solvent

The solvent is included for the purpose of uniformly dispersing and mixing the undercoat layer forming component, adjusting the viscosity, and ensuring workability. In one embodiment, the solvent may include one or more of a hydrocarbon-based solvent, a ketone-based solvent, and an acetate-based solvent. For example, at least one of a hydrocarbon-based solvent and a ketone-based solvent.

In one embodiment, the hydrocarbon solvent may include naphtha and an aromatic hydrocarbon solvent. The aromatic hydrocarbon solvent may include at least one of cyclohexanone, xylene, and toluene.

In one embodiment, the ketone solvent may include at least one of acetone, acetonitrile, methyl ethyl ketone, and methyl isobutyl ketone.

In one embodiment, the acetate-based solvent may include at least one of ethyl acetate, n-butyl acetate, cellosolve acetate, propylene glycol monomethyl acetate, and ethylene glycol diacetate.

In one embodiment, the solvent may be included in an amount of 20 to 90 parts by weight based on 100 parts by weight of the polyester resin. Under the above-mentioned conditions, mixing, dispersibility and workability can be excellent.

In one embodiment, the undercoat layer former may have a viscosity of 100-120 m ² / sec, a solids content of 56-62 wt%, and a specific gravity of 1.0-1.2. The workability can be excellent under the above conditions.

In one embodiment, the solvent is contained in an amount of 20 to 90 parts by weight based on 100 parts by weight of the polyester resin. When the solvent is contained in an amount of less than 20 parts by weight, mixing and workability are deteriorated. When the amount of the solvent is more than 90 parts by weight, the curing rate is lowered and the appearance and mechanical strength of the undercoat layer may be lowered.

In one embodiment, the undercoating layer may be formed by drying the applied undercoating layer forming agent at a temperature of 210-240 ° C for 20-50 seconds. Under the above conditions, the undercoating layer can be easily cured, and both the appearance and the physical properties can be excellent. In one embodiment, the undercoat layer may be formed to a thickness of 10 to 20 占 퐉. Both the appearance and the physical properties can be excellent in the above thickness. For example, 10-15 mu m.

(S20) Translucent Clear layer  Forming step

In this step, a semitransparent clear layer forming agent is applied to the surface of the undercoat layer and dried to form a translucent clear layer having a relief pattern on the surface.

Translucent Clear layer Formulator

The semitransparent clear layer forming agent includes a polyester resin, a melamine resin, a second pigment, a solvent and a pattern forming agent. In one embodiment, the translucent clear layer forming agent comprises 100 parts by weight of a polyester resin, 5 to 35 parts by weight of a melamine resin, 0.1 to 15 parts by weight of a second pigment, 0.5 to 15 parts by weight of a pattern forming agent and 30 to 100 parts by weight of a solvent .

Hereinafter, the constituent components of the translucent clear layer forming agent will be described in more detail.

Polyester resin

The polyester resin corresponds to a main component for forming the translucent clear layer.

Melamine resin

The melamine resin is included for the purpose of securing physical properties such as curing and adhesion of the polyester resin. In one embodiment, the melamine resin is included in an amount of 5 to 35 parts by weight based on 100 parts by weight of the polyester resin. When the content of the melamine resin is less than 5 parts by weight, the curability and adhesiveness are lowered, the mechanical strength of the translucent clear layer is lowered, and when the content exceeds 35 parts by weight, some unreacted melamine resin remains, Can be lowered.

In one embodiment, the polyester resin and the melamine resin may be contained in a weight ratio of 1: 0.05 to 1: 0.5. The processability and adhesion of the translucent clear layer can be excellent in the weight ratio.

Second pigment

The second pigment is mixed with the color of the undercoat layer to realize a special appearance such as multicolor by embodying the color on the translucent clear layer.

In one embodiment, the second pigment comprises at least one of a multi-color pigment and a mica coated with a metal oxide.

In one embodiment, the multicolor pigment is also referred to as a chameleon pigment and can exhibit various colors depending on the angle of light source and viewing angle.

In one embodiment is the multi-color pigment comprises at least one of silicon oxide (SiO ₂₎ with a metal oxide coating, titanium oxide (TiO ₂₎ and tin oxide (SnO). The silicon oxide coated with the metal oxide can realize various colors according to the angle of the incident light source and the angle of view, can further enhance the quality of the product, and can have excellent aesthetics. In one embodiment, the metal oxide may comprise at least one of titanium oxide (TiO ₂ ) and iron oxide (Fe ₂ O ₃ ).

The mica coated with the metal oxide is included in the present invention for the purpose of producing a pearl effect that produces an interference effect with reflected light. In one embodiment, the metal oxide may comprise at least one of titanium oxide (TiO ₂ ) and iron oxide (Fe ₂ O ₃ ).

In one embodiment, the second pigment is contained in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the polyester resin. When the second pigment is contained in an amount of less than 0.1 part by weight, the effect of the addition is insignificant, and when it exceeds 15 parts by weight, physical properties such as corrosion resistance of the translucent clear layer may be deteriorated.

In one embodiment the second pigments comprise the polyester resin 100 parts by weight of the metal oxide-coated silicon oxide with respect to the (SiO ₂₎ 0.1 ~ 13 parts by weight of a metal oxide-coated mica (mica) 0.1 ~ 3 parts by weight . When included in the above weight range, various colors can be implemented according to the angle of the light source and the viewing angle, and thus the aesthetics can be excellent.

A pattern forming agent

The pattern forming agent is included for the purpose of forming the concave-convex pattern of the translucent clear layer. In one embodiment, the pattern forming agent comprises a first pattern forming agent, a second pattern forming agent, and a third pattern forming agent.

In one embodiment, the first pattern forming agent comprises an amine compound, silica, and an acrylate compound. In one embodiment the second pattern-forming agent is an organic sulfonic acid compound, aluminum chloride (AlCl _3), and zeolite. In one embodiment, the third pattern forming agent comprises a polyolefin wax.

The organic sulfonic acid compound may be a compound containing a sulfone group (RSO ₃ -). In one embodiment, the organic sulfonic acid compound is selected from the group consisting of methanesulfonic acid, ethanesulfonic acid, 1-propanesulfonic acid, 2-propanesulfonic acid, 1 -butanesulfonic acid, 2- Hydroxypropane-1-sulfonic acid, 2-hydroxybutane-1-sulfonic acid, 2-hydroxypentane-1-sulfonic acid, etc. In addition to 2-hydroxypropane- , 3-hydroxypropane-1-sulfonic acid, 4-hydroxybutane-1-sulfonic acid, 2-hydroxyhexane-1-sulfonic acid, benzenesulfonic acid, alkylbenzenesulfonic acid, phenolsulfonic acid, naphthalenesulfonic acid, alkylnaphthalenesulfonic acid, ≪ / RTI >

The polyolefin wax may include at least one of a polyethylene wax and a polypropylene wax.

In one embodiment, the pattern forming agent is used in an amount of 0.1 to 3 parts by weight of the first pattern forming agent, 0.3 to 10 parts by weight of the second pattern forming agent and 0.1 to 3 parts by weight of the third pattern forming agent based on 100 parts by weight of the polyester resin Section. When included in the above range, it is possible to easily form the concavo-convex pattern without deteriorating the physical properties of the semitransparent clear layer of the present invention, thereby realizing excellent stereoscopic feeling and aesthetics.

The pattern forming agent is contained in an amount of 0.5 to 15 parts by weight based on 100 parts by weight of the polyester resin. When the pattern forming agent is contained in an amount of less than 0.5 part by weight, it is difficult to realize the uneven pattern effect of the present invention. When the pattern forming agent is contained in an amount exceeding 15 parts by weight, physical properties such as corrosion resistance of the translucent clear layer are lowered, Mixing and workability may be deteriorated.

solvent

The above-mentioned solvent is included for the purpose of uniformly dispersing and mixing the above-mentioned translucent clear layer forming component, adjusting the viscosity, and ensuring workability. In one embodiment, the solvent may include one or more of a hydrocarbon-based solvent, a ketone-based solvent, and an acetate-based solvent. The solvent can be the same as the above-mentioned undercoat layer forming agent, and thus a detailed description thereof will be omitted. For example, at least one of a hydrocarbon-based solvent and a ketone-based solvent.

In one embodiment, the solvent is contained in an amount of 30 to 100 parts by weight based on 100 parts by weight of the polyester resin of the translucent clear layer forming agent. When the solvent is contained in an amount of less than 30 parts by weight, the mixing property and workability are lowered. When the solvent is contained in an amount exceeding 100 parts by weight, the curing rate decreases and the appearance and mechanical strength of the translucent clear layer may be lowered.

Meanwhile, the color steel sheet of the present invention means a color steel sheet in which a concave / convex pattern of fine emboss is formed on the surface of the color-type steel sheet, and the light is diffused due to the texture of the surface to reduce the gloss. The fine embossed relief pattern can be formed by the pattern forming agent while the solvent evaporates. The shrinkage distortion of the lower portion of the semitransparent clear layer can be absorbed by the upper portion of the semitransparent clear layer, and a fine emboss pattern can be formed on the surface of the semitransparent clear layer.

In one embodiment, the translucent clear layer forming agent may have a viscosity of 100 to 120 m ² / sec, a solid content of 56 to 65 wt%, and a specific gravity of 1.1 to 1.3. The workability can be excellent under the above conditions.

In one embodiment, the semitransparent clear layer may be formed by drying the coated semitransparent clear layer forming agent at a temperature of from 210 to 240 ° C for 20 to 50 seconds. Under the above conditions, the semitransparent clear layer can be easily cured, and both appearance and physical properties can be excellent.

In one embodiment, the translucent clear layer may be formed to a thickness of 10 to 25 탆. Both the appearance and the physical properties can be excellent in the above thickness. For example, 10 to 20 占 퐉.

Color steel plate

Another aspect of the present invention relates to a color steel sheet produced by the method for manufacturing a color steel sheet. 2 shows a color steel sheet according to one embodiment of the present invention. Referring to FIG. 2, the color steel plate 200 of the present invention includes a base steel plate 101; A base layer 120 formed on the surface of the base steel sheet 101; And a translucent clear layer (130) formed on the surface of the undercoat layer (120) and having a relief pattern formed on the surface thereof.

In one embodiment, the pretreatment layer 110 may be further formed on the surface of the plating layer 102 formed on the base steel sheet 101. The pretreatment layer 110 improves the corrosion resistance and improves adhesion between the base steel sheet and the paint. In one embodiment, the pretreatment layer 110 is formed by applying a chrome or non-chrome pretreatment agent to the surface of the base steel sheet, heating the base steel sheet temperature to 80 to 120 ° C, It may be formed to a thickness of 2 mu m.

In one embodiment, the undercoat layer 120 comprises a polyester resin, an epoxy resin, a melamine resin and a first pigment, wherein the translucent clear layer 130 comprises a polyester resin, a melamine resin, a second pigment and a patterning agent do. In one embodiment, translucent clear layer 130 may have a transmittance of 15% to 95%.

In one embodiment, the undercoat layer comprises 100 parts by weight of a polyester resin, 5 to 25 parts by weight of an epoxy resin, 5 to 35 parts by weight of a melamine resin, and 0.01 to 80 parts by weight of a first pigment. The same components and contents as those described above can be applied to the undercoat layer component, so that a detailed description thereof will be omitted.

In one embodiment, the undercoat layer may be formed to a thickness of 10 to 20 占 퐉. Both the appearance and the physical properties can be excellent in the above thickness. For example, 10-15 mu m.

In one embodiment, the translucent clear layer may be formed to a thickness of 10 to 25 탆. Both the appearance and the physical properties can be excellent in the above thickness. For example, 10 to 20 占 퐉.

In one embodiment, the translucent clear layer comprises 100 parts by weight of a polyester resin, 5 to 35 parts by weight of a melamine resin, 0.1 to 15 parts by weight of a second pigment, and 0.5 to 15 parts by weight of a pattern forming agent. Since the same components and contents as those described above can be applied to the translucent clear layer, detailed description thereof will be omitted.

In one embodiment, the first pigment is selected from the group consisting of silica, carbon black, iron oxide, titanium oxide (TiO ₂ ), antimony (Sb), quinacridone, copper-phthalocyanine copper-phthalocyanine, and chromium (Cr), wherein the second pigment comprises at least one of a multi-color pigment and a metal oxide coated mica, (SiO ₂ ), titanium oxide (TiO ₂ ), and tin oxide (SnO) coated with a metal oxide.

When the undercoat layer and the semitransparent clear layer including the above-described components are applied, the color of the undercoat layer and the semitransparent clear layer is refracted and mixed to realize a special color such as multicolor, and thus the aesthetics can be excellent.

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.

Example  And Comparative Example

Example  One

(a) Substrate layer forming agent: 100 parts by weight of a polyester resin, 18 parts by weight of an epoxy resin, 20 parts by weight of a melamine resin, 4.5 parts by weight of a first pigment (black color: 4 parts by weight of silica and 0.5 parts by weight of carbon black) , 50 to 80 parts by weight of a polyvinyl alcohol (cyclohexanone and methyl ethyl ketone), a viscosity of 110 m ² / sec, a solid content of 58 wt% and a specific gravity of 1.1 to 1.2.

(b) forming a translucent clear layer claim: polyester resin 100 parts by weight of melamine resin 23 parts by weight of a multi-color (translucent blue color) a second pigment 5 parts by weight (the titanium dioxide coating the treated silicon oxide having (SiO ₂₎ 50 (Including titanium oxide (TiO ₂ ) 45% by weight and tin oxide (SnO 2) 5% by weight), 6 parts by weight of pattern formation and 60 parts by weight of solvent (including cyclohexanone and naphtha 1: A viscosity of 110 m ² / sec, a solid content of 63 wt%, and a specific gravity of 1.2.

0.5 part by weight of a first pattern forming agent (amine compound, silica and acrylate compound), 0.5 part by weight of a second pattern forming agent (organic sulfonic acid compound, aluminum chloride (AlCl ₃ ) And zeolite) and 0.5 part by weight of a third pattern forming agent (polypropylene wax) were applied.

The undercoat layer forming agent was applied to the surface of the base steel sheet (hot-dip galvanized steel sheet) and dried at 224 ° C for 20 to 50 seconds to form a 15 μm thick undercoat layer.

Then, a semi-transparent clear layer forming agent was applied to the surface of the undercoat layer and dried at a temperature of 210 to 240 ° C for 20 to 50 seconds to form a concave-convex pattern on the surface. A translucent clear layer was formed to prepare a color steel plate specimen.

Example  2

Translucent clear from the formed layer, multi-color (translucent pink color) for which the second pigment 1 part by weight (the titanium dioxide coating the treated silicon oxide (SiO ₂₎ 52% by weight of titanium oxide (TiO ₂₎ 46 wt% of tin oxide (Containing 2% by weight of SnO 2) was applied to the specimen.

Example  3

19 parts by weight of the first pigment (blue color: 4 parts by weight of silica, and 15 parts by weight of titanium oxide, carbon black and copper-phthalocyanine)

Translucent clear from the formed layer, multi-color (translucent blue color) for which the second pigment 1 part by weight (the titanium dioxide coating the treated silicon oxide (SiO ₂₎ 50% by weight of titanium oxide (TiO ₂₎ 45 wt% of tin oxide (Including 5% by weight of SnO 2) was applied to the specimen.

Example  4

13.5 parts by weight of the first pigment (red color: 3.5 parts by weight of silica, and 10 parts by weight of titanium oxide, carbon black and quinacridone) were applied in a subbing layer forming agent,

Translucent clear from the formed layer, multi-color (translucent pink color) for which the second pigment 1 part by weight (the titanium dioxide coating the treated silicon oxide (SiO ₂₎ 52% by weight of titanium oxide (TiO ₂₎ 46 wt% of tin oxide (Containing 2% by weight of SnO 2) was applied to the specimen.

Example  5

28.5 parts by weight of the first pigment (gray collar: 3.5 parts by weight of silica, and 25 parts by weight of carbon black, iron oxide, titanium oxide and chromium) in the undercoating agent were applied,

Among the semi-transparent clear layer formed, a second pigment, 1.2 parts by weight (titanium dioxide coated with 52% by weight of silicon oxide (SiO ₂₎ treatment, titanium (TiO ₂₎ 45 wt% of oxide having a multi-color (semitransparent violet (violet) color) And 3% by weight of tin oxide (SnO)) was applied on the surface of the steel sheet.

Example  6

18.5 parts by weight (brown color: 3.5 parts by weight of silica and carbon black, iron oxide, titanium oxide and antimony 15 parts by weight) of the first pigment were applied in the undercoat layer forming agent,

Among the semi-transparent clear layer formed, a second pigment, 1.2 parts by weight (titanium dioxide coated with 52% by weight of silicon oxide (SiO ₂₎ treatment, titanium (TiO ₂₎ 45 wt% of oxide having a multi-color (semitransparent violet (violet) color) And 3% by weight of tin oxide (SnO)) was applied on the surface of the steel sheet.

Comparative Example  One

Color steel sheet specimens were prepared in the same manner as in Example 1, except that 3 parts by weight of epoxy resin was added to 100 parts by weight of the polyester resin in the undercoat layer forming agent.

Comparative Example  2

A color steel plate specimen was prepared in the same manner as in Example 1, except that 3 parts by weight of melamine resin was added to 100 parts by weight of the polyester resin in the translucent clear layer forming agent.

Comparative Example  3

18 weight parts (4 weight parts of the first pattern formation, 10 weight parts of the second pattern formation and 4 weight parts of the third pattern formation) were applied to 100 weight parts of the polyester resin in the translucent clear layer forming agent , A color steel plate specimen was prepared in the same manner as in Example 1.

Test Example

The properties of the color steel plate specimens prepared according to Examples and Comparative Examples are as follows.

(1) Workability: The T-bending test was carried out to determine whether or not the bending radius of the specimen cracked at twice the specimen thickness.

(Good (O): no cracks, bad (X): cracks)

(2) Adhesion of Coating Film (Adhesion): The film adhesion was evaluated by cross cutting 10 lines at a distance of 1 mm width x 1 mm on a flat sample coated with paint to make 100 squares having an area of 1 mm ² , (Erickson processing) was applied to the cross cutting plate portion, and when the adhesive tape was finally 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, poor (X): peeling of the cross cutting part coating film)

(3) Impact resistance: Impact resistance was evaluated by whether or not a crack occurred after a surface impact after dropping the weight under a condition of 1/2? X 1 kg x 500 mm.

(Good (O): no crack, poor (X): crack)

(4) Coating degree: Coating hardness was evaluated by rubbing 50 times of rubbing with 1 kgf force after rubbing the gauges with methyl ethyl ketone (MEK), and evaluating whether or not resin peeling and swelling occurred.

(Good: (O): no resin peeling and no swelling, poor (X): resin peeling or swelling)

(5) Corrosion resistance: The corrosion resistance was evaluated by the spray test of neutral salt spray for 500 hours after X-cutting on the specimens, and then, the corrosion of the plated surface, the occurrence of rust, and the blister size were checked. The evaluation criteria are as follows.

(Good: (O): paint film peeling, no corrosion of plated surface, no rust, blister less than 3mm, bad (X): peeling of coating film, peeling, corrosion of plated surface or rust, blister more than 3mm)

(6) Pencil hardness: Pencil hardness was measured using a pencil (manufactured by Mitsubishi Heavy Industries, Ltd.).

Table 1 shows the results of the physical properties evaluation based on the evaluation criteria for the specimens of Examples 1 to 6 and Comparative Examples 1 to 3.

3 is a photograph of the results of evaluation of physical properties of Examples 1 to 5, and the surface texture photographs of the color steel sheets of Examples 1 to 5 are shown in Fig. 4 Respectively.

Referring to the results of Table 1, the color steel sheet specimens of Examples 1 to 6 were excellent in corrosion resistance, impact resistance, workability, coating film hardness, pencil hardness and coating film adhesion. 3 and 4, the color steel sheet specimens of Examples 1 to 5 of the present invention are excellent in appearance, such as being formed on the surface with fine embossed relief, and have excellent corrosion resistance, impact resistance, workability, The hardness and the film adhesion were all excellent.

On the other hand, in Comparative Example 1 in which the undercoat layer forming agent which is less than the epoxy resin content of the present invention was applied, the adhesion of the undercoat layer was lower than that of Examples 1 to 6, and the translucent clear layer forming agent , Comparative Example 3 in which the semitransparent clear layer had a lower adhesion property, film hardening degree and hardness than those of Examples 1 to 6, and Comparative Example 3 in which the pattern forming agent content of the present invention was exceeded, It was found that the hardness was lower than those of Examples 1 to 6.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

101: base steel plate 102: plated layer
110: Pretreatment layer 120: Lower layer
130: translucent clear layer 200: colored steel plate

Claims (8)

Base steel plate;
A base layer formed on the surface of the base steel sheet; And
And a semitransparent clear layer formed on the surface of the undercoat layer, the semitransparent clear layer having a relief pattern formed on the surface thereof,
Wherein the undercoat layer comprises 100 parts by weight of a polyester resin, 5 to 25 parts by weight of an epoxy resin, 5 to 35 parts by weight of a melamine resin and 0.01 to 80 parts by weight of a first pigment,
Wherein the translucent clear layer comprises 100 parts by weight of a polyester resin, 5 to 35 parts by weight of a melamine resin, 0.1 to 15 parts by weight of a second pigment and 0.5 to 15 parts by weight of a pattern forming agent,
Wherein the pattern forming agent comprises a first pattern forming agent, a second pattern forming agent and a third pattern forming agent,
Wherein the first pattern forming agent comprises an amine compound, silica and an acrylate compound,
Wherein the second pattern-forming agent comprises an organic sulfonic acid compound, aluminum chloride (AlCl _3), and zeolite, and
Wherein the third pattern forming agent comprises a polyolefin wax.
The method according to claim 1,
Wherein the pattern forming agent comprises 0.1 to 3 parts by weight of the first pattern forming agent, 0.3 to 10 parts by weight of the second pattern forming agent and 0.1 to 3 parts by weight of the third pattern forming agent with respect to 100 parts by weight of the polyester resin Wherein the steel plate is a steel plate.
The method according to claim 1,
The first pigment may be selected from the group consisting of silica, carbon black, iron oxide, titanium oxide (TiO ₂ ), antimony (Sb), quinacridone, copper-phthalocyanine, And chromium (Cr).
Wherein the second pigment comprises at least one of a multi color pigment and a mica coated with a metal oxide,
Wherein the multicolor pigment comprises at least one of silicon oxide (SiO ₂ ), titanium oxide (TiO ₂ ), and tin oxide (SnO) coated with a metal oxide.
The method of claim 3,
The second pigment includes 0.1 to 13 parts by weight of silicon oxide (SiO ₂ ) coated with a metal oxide and 0.1 to 3 parts by weight of mica coated with a metal oxide, based on 100 parts by weight of the polyester resin Color steel plate.
Applying and drying the undercoat layer agent on the surface of the base steel sheet to form a undercoat layer; And
Applying a translucent clear layer-forming agent to the surface of the undercoat layer and drying the resultant to form a translucent clear layer on the surface of which a concave-convex pattern is formed,
Wherein the undercoat layer forming agent comprises 100 parts by weight of a polyester resin, 5 to 25 parts by weight of an epoxy resin, 5 to 35 parts by weight of a melamine resin, 0.01 to 80 parts by weight of a first pigment and 20 to 90 parts by weight of a solvent,
Wherein the translucent clear layer forming agent comprises 100 parts by weight of a polyester resin, 5 to 35 parts by weight of a melamine resin, 0.1 to 15 parts by weight of a second pigment, 0.5 to 15 parts by weight of a pattern forming agent and 30 to 100 parts by weight of a solvent,
Wherein the pattern forming agent comprises a first pattern forming agent, a second pattern forming agent and a third pattern forming agent,
Wherein the first pattern forming agent comprises an amine compound, silica and an acrylate compound,
Wherein the second pattern forming agent comprises an organic sulfonic acid compound, aluminum chloride and zeolite,
Wherein the third pattern forming agent comprises a polyolefin wax.
6. The method of claim 5,
The first pigment may be selected from the group consisting of silica, carbon black, iron oxide, titanium oxide (TiO ₂ ), antimony (Sb), quinacridone, copper-phthalocyanine, And chromium (Cr).
Wherein the second pigment comprises at least one of a multi color pigment and a mica coated with a metal oxide,
Wherein the multicolor pigment comprises at least one of silicon oxide (SiO ₂ ), titanium oxide (TiO ₂ ), and tin oxide (SnO) coated with a metal oxide.
6. The method of claim 5,
Wherein the undercoat layer forming agent has a viscosity of 100 to 120 m ² / sec, a solid content of 56 to 62 wt% and a specific gravity of 1.0 to 1.2,
Wherein the translucent clear layer forming agent has a viscosity of 100 to 120 m ² / sec, a solid content of 56 to 65 wt%, and a specific gravity of 1.1 to 1.3.
6. The method of claim 5,
Wherein the semitransparent clear layer is formed by drying the coated semitransparent clear layer forming agent at a temperature of from 210 to 240 DEG C for 20 to 50 seconds at a PMT (Peak Metal Temperature).

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