KR20190023158A - Manufacturing method for color steel sheet and color steel sheet thereof - Google Patents

Abstract

Disclosed are a method for manufacturing a color steel sheet, and a color steel sheet manufactured thereby. According to an embodiment of the present invention, the method for manufacturing a color steel sheet comprises the steps of: forming a primer coating layer by applying a primer coating solution on a surface of a base steel sheet to dry the same; forming a semi-transparent clear layer having an embossed unevenness pattern formed on a surface thereof, on a surface of the primer coating layer, wherein the semi-transparent clear layer supplies a semi-transparent coating solution to a pickup roll having an engraved pattern formed on an outer circumferential surface thereof, and shifts the semi-transparent coating solution supplied to the pickup roll to an applicator roll disposed adjacent to the pickup roll; and transferring the semi-transparent coating solution shifted to the applicator roll to a surface of the primer coating layer of the base steel sheet, moved by a backup roll disposed adjacent to the applicator roll.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for manufacturing a color steel sheet,

The present invention relates to a method of manufacturing a color steel sheet and a color steel sheet produced thereby. More particularly, the present invention relates to a method of manufacturing a mat-type color steel sheet which is excellent in adhesion to a base material and which can realize a superior aesthetic feeling by implementing a discoloration effect according to a specific color and angle, will be.

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 method of manufacturing a color steel plate having excellent three-dimensional feeling and surface texture.

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

According to one embodiment of the present invention, there is provided a method of manufacturing a color steel plate 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 color steel sheet produced by the method for manufacturing a color steel sheet.

One aspect of the present invention relates to a method of manufacturing a color steel plate. In one embodiment, the method for manufacturing a color steel sheet includes: coating a base coating solution on a surface of a base steel sheet and drying the base coating solution to form a base coating layer; And forming a semitransparent clear layer on the surface of the undercoat layer, the semitransparent clear layer having a relief pattern formed on the surface thereof, wherein the semitransparent clear layer is formed by applying a translucent coating solution Transferring the semitransparent coating liquid supplied to the pick-up roll to an applicator roll disposed adjacent to the pick-up roll, and transferring the translucent coating liquid transferred to the applicator roll to a back- And transferring the base coat to a surface of the undercoating layer of the base steel sheet which is moved by a back up roll, wherein the undercoat coating solution comprises 100 parts by weight of a polyester resin, 5 to 25 parts by weight of an epoxy resin, From 5 to 35 parts by weight, from 0.01 to 80 parts by weight of the first pigment and from 20 to 90 parts by weight of the solvent, wherein the translucent coating liquid 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.

In one embodiment, the engraving pattern may be formed on the outer circumferential surface of the pickup roll at a depth of 1 mm or less.

In one embodiment, the pattern forming agent includes at least one of 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 the third pattern forming agent may comprise 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).

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.

In one embodiment, the undercoating liquid 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. The semi-transparent coating liquid has a viscosity of 100 to 120 m ² / sec, : 56 to 65% by weight and specific gravity: 1.1 to 1.3.

In one embodiment, the translucent clear layer may be formed by drying a semitransparent coating solution transferred to the surface of the undercoat layer at a temperature of 210 to 240 ° C for 20 to 50 seconds.

Another aspect of the present invention relates to a color steel sheet produced by the method for manufacturing a color steel sheet. 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 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 .

The color steel sheet of the present invention can maximize the three-dimensional effect and the surface texture, and it is possible to realize a special color such as multi-color by mixing the colors of the undercoat layer and the semi-transparent top layer, It can be applied to not only architectural exterior materials, but also interior and interior decorations. The present invention can be applied to interior decoration and interior decoration materials.

1 shows a method of manufacturing a color steel sheet according to one embodiment of the present invention.
2 schematically shows a process of forming a translucent clear layer according to one embodiment of the present invention.
3 shows a color steel sheet according to one embodiment of the present invention.
4 is a photograph showing the surface of a color steel sheet of a comparative example according to an embodiment of the present invention and 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) coating a base coating solution on a surface of a base steel sheet to form a base coating layer; And forming a translucent clear layer on the surface of the undercoat layer, wherein the translucent clear layer has a pattern of embossed on the surface thereof, wherein the translucent clear layer is formed on a pick-up roll Transferring a semi-transparent coating liquid supplied to the pick-up roll to an applicator roll disposed adjacent to the pick-up roll, and applying a translucent coating liquid transferred to the applicator roll adjacent to the applicator roll To a surface of a base layer of a base steel sheet, which is moved by a back up roll.

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

This step is a step of forming a primer layer by applying and drying a primer coating solution 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 prepared by applying a chromium or non-chrome pretreatment agent to the surface of the base steel sheet, heating the base steel sheet temperature to 80 to 120 ° C, and hot-air drying the coated steel sheet for 3 to 7 seconds, Thickness.

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.

Coating solution

The undercoating liquid includes a polyester resin, an epoxy resin, a melamine resin, a first pigment, and a solvent. For example, the undercoating liquid 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 undercoating liquid 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 lowered. When the epoxy resin is contained in an amount exceeding 25 parts by weight, mixing performance and workability of the undercoating liquid may be lowered.

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 mixing performance and workability of the undercoat solution may be decreased, and the mechanical strength of the undercoat layer may be lowered.

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 ensuring workability by uniformly dispersing and mixing the components of the undercoating liquid, and adjusting the viscosity. 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 undercoating liquid may have 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. 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 undercoat layer may be formed by drying the coated undercoating liquid at a temperature of 210 to 240 ° C for 20 to 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

The step is a step of forming, on the surface of the undercoating layer, a translucent clear layer having a pattern of embossed bumps formed on the surface thereof. In one embodiment, the translucent clear layer can be prepared by roll coating a semitransparent coating solution on the surface of the undercoat layer.

FIG. 2 schematically shows a process of forming a translucent clear layer according to one embodiment of the present invention. 2, the semitransparent clear layer 130 is formed by supplying a semitransparent coating liquid C to a pick-up roll 10 having an engraved pattern formed on the outer circumferential surface thereof, translucent coating liquid C supplied to the pickup roll 10, The coating liquid C is transferred to the applicator roll 20 disposed adjacent to the pick-up roll 10 and the translucent coating liquid C transferred to the applicator roll 20 is transferred to the applicator roll 20 To the surface of the undercoat layer 120 of the base steel plate 101, which is moved by a back-up roll 30 arranged by the back-up roll.

Referring to FIG. 2, the pickup roll 10 rotates in opposite directions to the applicator roll 20, and the applicator roll 20 and the backup roll 30 can rotate in the same direction. Under this condition, the embossed coating liquid formed from the pick-up roll 10 can be easily transferred to the steel sheet surface.

Although not shown in FIG. 2, at least one of a plating layer and a pretreatment layer may be further formed between the base steel sheet 101 and the undercoat layer.

2, the pick-up roll 10 is formed with engraved patterns and the translucent coating liquid C is fed to the pick-up roll 10 and conveyed by the back-up roll 30 through the applicator roll 20 When forming the semitransparent clear layer 130 on the surface of the base layer of the base steel sheet 101, the emboss pattern of the shape corresponding to the engraved pattern can be formed.

In one embodiment, the engraved pattern may be formed on the outer circumferential surface of the pickup roll by etching in the form of metal, mineral crystal, or the like, but is not limited thereto.

In one embodiment, the engraving pattern may be formed on the outer circumferential surface of the pickup roll 10 at a depth D of 1 mm or less. When the engraved pattern is formed at the depth, the embossed pattern can easily be formed on the color steel plate translucent coating layer of the present invention. For example, the depth D of the engraved pattern may be greater than 0 and less than or equal to 1 mm. Other examples may be greater than 0 and less than 0.1 mm. As another example, it may be 30 to 60 mu m.

Translucent coating solution

The semi-transparent coating liquid includes a polyester resin, a melamine resin, a second pigment, a solvent and a pattern forming agent. In one embodiment, the translucent coating solution 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 components of the semi-transparent coating liquid 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 a pattern of relief on the surface of the translucent clear layer together with the pick-up roll formed with the engraved pattern. In one embodiment, the pattern forming agent may include a first pattern forming agent, a second pattern forming agent, and a third pattern forming agent. In one embodiment, the first pattern forming agent may include an amine compound, silica, and an acrylate compound. In one embodiment, the second pattern forming agent may comprise an organic sulfonic acid compound, aluminum chloride (AlCl ₃ ), and zeolite. In one embodiment, the third pattern former may comprise 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 concave-convex pattern effect of the present invention. When the amount exceeds 15 parts by weight, physical properties such as corrosion resistance of the translucent clear layer are deteriorated. The workability may be deteriorated.

solvent

The solvent is included for the purpose of uniformly dispersing and mixing the components of the translucent coating liquid, 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. Since the solvent can use the same components as the above-mentioned undercoat liquid, 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 coating liquid. 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 emboss pattern of the semitransparent clear layer of the present invention can be formed not only by the pickup roll on which the engraved pattern is formed but also by the pattern forming agent while the solvent evaporates. For example, the upper portion of the semitransparent clear layer absorbs the shrinkage distortion of the lower portion of the semitransparent clear layer, and the emboss pattern is formed on the surface of the semitransparent clear layer, so that the stereoscopic effect of the present invention can be further improved.

In one embodiment, the semi-transparent coating liquid 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.

The semi-transparent clear layer may be formed by drying the translucent coating solution transferred to the surface of the undercoat layer at a temperature of 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. 3 shows a color steel sheet according to one embodiment of the present invention. Referring to FIG. 3, 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 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 0.5 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 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.

The color steel sheet according to the present invention can form a semi-transparent coating layer formed with a relief pattern by applying a pick-up roll formed with a relief pattern, thereby maximizing the three-dimensional effect and the surface texture. The color of the undercoat layer and the semi-transparent top layer are mixed It is possible to realize a special color such as multi-color, and it is possible to realize a discoloration effect according to the viewing angle, thus providing excellent aesthetics, excellent film adhesion, impact resistance, coating film hardenability and corrosion resistance, In addition, it can be applied to indoor interior accessories and architectural interior materials.

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 coating liquid: 80 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 hexane and methyl ethyl ketone having a viscosity of 110 m ² / sec, a solid content of 58 wt% and a specific gravity of 1.1 to 1.2.

(b) a translucent coating: 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 (50% by weight of titanium dioxide-coated silicon oxide (SiO ₂₎ treated with a, (Including 45% by weight of titanium oxide (TiO ₂ ) and 5% by weight of tin oxide (SnO ₂ )), 6 parts by weight of pattern formation and 60 parts by weight of solvent (including cyclohexanone and naphtha in a 1: 1 weight ratio) 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 undercoating liquid 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 lower layer having a thickness of 15 μm.

Next, as shown in FIG. 2, the semi-transparent coating liquid (C) is supplied to a pickup roll (10) which is formed on the outer circumferential surface at a depth (D) of 30 to 60 占 퐉 in the engraved pattern and rotates counterclockwise, The translucent coating liquid C supplied to the roll 10 is transferred to the applicator roll 20 disposed adjacent to the pick-up roll 10 and rotating in the clockwise direction, and the translucent coating liquid C transferred to the applicator roll 20 Was transferred to the lower surface layer 120 of the base steel plate 101 which was disposed adjacent to the applicator roll 20 and moved by the backup roll 30 rotating in the clockwise direction.

Then, the coated semitransparent coating liquid was dried at a temperature of 210-240 ° C. (PMT) for 20 to 50 seconds to form a semi-transparent clear layer having a bumpy pattern on its surface and having a thickness of 15 μm, .

Example  2

1 part by weight of a second pigment having a multicolor (translucent pink color) (52% by weight of titanium oxide-coated silicon oxide (SiO ₂ ), 46% by weight of titanium oxide (TiO ₂ ) and tin oxide (SnO 2) 2% by weight) was applied to the steel sheet of the present invention, a color steel plate specimen was prepared in the same manner as in Example 1.

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)

In a semi-transparent coating, a multi-color (translucent blue color) a 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 (SnO) having a 5% by weight) was applied to the specimen of the present invention, a color steel plate specimen was prepared in the same manner as in Example 1.

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 the undercoating liquid,

1 part by weight of a second pigment having a multicolor (translucent pink color) (52% by weight of titanium oxide-coated silicon oxide (SiO ₂ ), 46% by weight of titanium oxide (TiO ₂ ) and tin oxide (SnO 2) 2% by weight) was applied to the steel sheet of the present invention, a color steel plate specimen was prepared in the same manner as in Example 1.

Comparative Example  One

A color steel plate specimen was prepared in the same manner as in Example 1, except that a semi-transparent clear layer was formed using a pickup roll on which no engraving pattern was formed on the outer circumferential surface.

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 an epoxy resin was applied to 100 parts by weight of the polyester resin in the undercoating liquid.

Comparative Example  3

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 coating liquid.

Comparative Example  4

Except that 18 parts by weight of a matony forming agent (4 parts by weight of the first pattern forming agent, 10 parts by weight of the second pattern forming agent and 4 parts by weight of the third pattern forming agent) was applied to 100 parts by weight of the polyester resin in the translucent coating liquid , And 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) Processability: T-bending test was conducted according to ASTM D4145 to evaluate whether or not cracks occurred at twice the radius of the bending radius.

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

(2) The coating film adhesiveness (adhesion): the coating film adhesion castle on the basis of the ASTM D3359 standard, and 10 line by line with an interval of W x each 1mm above the plane samples the paint coating to Cross cutting a square of 100 with an area of 1mm ² After making the specimen, the cross cutting plate was further machined (Erickson processing) at a height of 6 mm. Finally, when the adhesive tape was attached, 100 pieces of the coating film were peeled off 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 as follows, based on ASTM D2794 standard, whether or not cracks were generated after dropping a weight of 500 g from a height of 50 cm and surface impact.

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

(4) Coating hardness: Coating hardness was evaluated in accordance with ASTM D 5402-93. After rubbing the gauze with methyl ethyl ketone (MEK) for 50 times at a force of 1 kgf, the resin peeling and swelling The following were evaluated as to whether or not they occurred.

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

(5) Corrosion Resistance: Corrosion resistance was evaluated according to ASTM D-1654, and the specimens were subjected to a spray test of neutral salt (5% Nacl) for 500 hours after X-cutting to determine whether the coating was peeled, Occurrence of blister, and blister size. 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 physical properties evaluation based on the evaluation criteria for the specimens of Examples 1 to 4 and Comparative Examples 1 to 4.

With reference to the results of Table 1, the color steel plate specimens of Examples 1 to 4 had the same level of corrosion resistance, impact resistance, workability, and coating film hardness as those of the color steel plate of Comparative Example 1 , The pencil hardness and the coating film adhesion can be secured.

On the other hand, in Comparative Example 2 in which the undercoating liquid of the present invention was less than the epoxy resin content of the present invention, the adhesiveness of the undercoating layer was lower than that of Examples 1 to 4 and Comparative Example 3 in which a translucent coating liquid, which is less than the content of the melamine resin of the present invention, The adhesion of the semitransparent clear layer, the degree of hardening of the coating film and the hardness thereof were lower than those of Examples 1 to 4, and Comparative Example 4 in which the content of the pattern forming agent of the present invention was exceeded showed that the processability, film hardenability, corrosion resistance, , Respectively.

Fig. 4 (a) is a photograph showing the surface of the color steel sheet of Example 1, and Fig. 4 (b) is a surface of the color steel sheet of Comparative Example 1. Fig. Referring to FIG. 4, in the case of Example 1 using a pick-up roll having a depressed pattern on the outer circumferential surface, the embossed pattern was formed on the surface, and it was found that the three-dimensional feeling was more excellent than that of the comparative example 1 colored steel sheet.

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.

10: pick-up roll 20: applicator roll
30: backup roll 101: base steel plate
102: Plating layer 110: Pretreatment layer
120: lower layer 130: translucent clear layer
200: Color steel plate C: Semi-transparent coating liquid

Claims (8)

Applying a primer coating solution on the surface of the base steel sheet and drying to form a primer layer; And
Forming a semitransparent clear layer on the surface of the undercoat layer wherein a pattern of embossments is formed on the surface,
The semi-
A semitransparent coating liquid is supplied to a pick-up roll on which an engraved pattern is formed on the outer circumferential surface,
Translucent coating liquid supplied to the pick-up roll is transferred to an applicator roll disposed adjacent to the pick-up roll, and
And transferring the semitransparent coating liquid transferred to the applicator roll to a surface of the undercoat layer of the base steel sheet which is moved by a back up roll disposed adjacent to the applicator roll,
The undercoating liquid 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,
Wherein the translucent coating liquid 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. Steel plate manufacturing method.
The method according to claim 1,
Wherein the engraved pattern is formed on the outer circumferential surface of the pickup roll to a depth of 1 mm or less.
The method according to claim 1,
Wherein the pattern forming agent comprises at least one of 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,
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.
5. The method of claim 4,
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 Of the steel sheet.
The method according to claim 1,
The undercoating liquid 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 semi-transparent coating liquid 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.

The method according to claim 1,
Wherein the semitransparent clear layer is formed by drying a semitransparent coating solution transferred to the surface of the undercoat layer at a temperature of 210 to 240 ° C for 20 to 50 seconds. .
Base steel plate;
A base layer formed on the surface of the base steel sheet; And
And a translucent clear layer formed on the surface of the undercoat layer and having embossed patterns 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.

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