KR101586979B1 - Color steel sheetand mehtod of mamufacturing the same - Google Patents

Abstract

Disclosed are a color steel sheet and a production method thereof. The color steel sheet of the present invention and a production method thereof comprise: a steel sheet base metal; a pretreatment layer formed on a surface of the steel sheet base metal; a base coating layer formed on the surface of the pretreatment layer; and a clear top coating layer formed on the surface of the base coating layer. The clear top coating layer is made of a cured material of a clear top coating paint composition, and the clear top coating paint composition comprises: a polyester resin, a melamine resin, a pearl pigment, an amine-based compound, silicone dioxide (SiO_2), an acrylic resin, a solvent, and residual water.

Description

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

The present invention relates to a color steel sheet and a method of manufacturing the same, and more particularly, to a color steel sheet in which the color of the undercoat layer and the texture of the clear topcoat layer are respectively 2won.

The color steel plate is a steel plate painted with a paint composition or laminated film to give corrosion resistance, aesthetics and the like to the steel plate material, and is widely used for building materials or household appliances. Such a color steel sheet is realized by applying a coating composition on a steel sheet and then forming a cured coating layer.

In recent years, demand for color steel sheets having various functions has been increasing, while ensuring high quality and reducing manufacturing cost. For example, copper colored galvalume (GL) steel plate is coated with translucent clear coating of copper using the sequin pattern of the plating layer, and is used for a building water tray.

These color steel plates for building materials are important in terms of their color and texture. Related Prior Art Korean Patent Laid-Open Publication No. 1282570 (2013.06.28, Color steel plate manufacturing method) is known.

According to an aspect of the present invention, there is provided a color steel sheet in which the color of the undercoat layer is two-sided in the clear topcoat layer.

According to another aspect of the present invention, there is provided a colored steel sheet which has excellent aesthetic design effects such as texture improvement by including a pearl pigment in a clear top layer.

According to still another aspect of the present invention, there is provided a colored steel sheet which is excellent in cost reduction and cost reduction by using hot dip galvanizing.

According to another aspect of the present invention, there is provided a colored steel sheet excellent in surface texture, workability, adhesion (film adhesion), impact resistance, coating film hardenability and corrosion resistance.

According to another aspect of the present invention, there is provided a method of manufacturing a color steel plate in which the color difference in lot by production coil is remarkably reduced.

According to still another aspect of the present invention, there is provided a method of manufacturing a color steel sheet in which there is no dye leakage and color change in the coating layer due to the protective effect of the clear top layer during rain after construction.

According to another aspect of the present invention, there is provided a method of manufacturing a color steel plate, which is similar to a galvanic pattern that can be seen only in a GL product, is implemented in GI and further reinforced to a surface texture.

The above and other objects to be solved by the present invention can be achieved by the present invention described below.

According to an aspect of the present invention, there is provided a color steel plate comprising: a steel plate base material; A pretreatment layer formed on the surface of the steel sheet base material; A primer layer formed on the surface of the pretreatment layer; And a clear top layer formed on the surface of the undercoat layer, wherein the clear top coat layer is formed of a cured product of the clear top coat composition, and the clear top coat paint composition is a polyester resin, a melamine resin, a pearl pigment, , Silicon dioxide (SiO2), an acrylic resin, a solvent, and the remainder water.

In one embodiment, the clear top coat paint composition comprises 44 to 58% by weight of a polyester resin; 2 to 6% by weight of a melamine resin; 0.1 to 0.2% by weight of a pearl pigment; 0.1 to 1.0% by weight of an amine compound; From 0.1 to 1.0% by weight of silicon dioxide (SiO2); 0.1 to 1% by weight of an acrylic resin; 20 to 30% by weight of a solvent; And water of the remainder.

In one embodiment, the pearl pigment has an average particle diameter of 5 to 15 탆 and is characterized in that the inorganic particles are coated with a metal, a metal oxide or a non-metal oxide.

In one embodiment, the inorganic particles are selected from the group consisting of mica, glass, alumina, wollastonite, silica or mixtures thereof, and the metal or metal oxide is selected from gold, silver, platinum, palladium, titanium, iron, chromium, aluminum, Magnesium, zirconium, cerium or lithium, or an oxide thereof, and the non-metal oxide is silicon dioxide.

In one embodiment, the undercoat layer is formed of a cured product of the undercoat composition, wherein the undercoat composition comprises at least one of a polyester resin, a melamine resin, a pigment, a sulfonic acid, silicon dioxide (SiO2), an acrylic resin, .

In one embodiment, the undercoat paint composition comprises: a) from 53 to 67% by weight of a polyester resin; b) 3 to 7% by weight of a melamine resin; c) 1 to 2% by weight of pigment; d) 1 to 2% by weight of sulfonic acid; e) 1-2% by weight of silicon dioxide (SiO2); f) 1 to 2% by weight of an acrylic resin; g) 25 to 35% by weight of solvent; And h) the remainder of the water.

According to another aspect of the present invention, there is provided a method of manufacturing a color steel sheet, comprising the steps of: a) applying an antireflective coating agent to a surface of a steel sheet base material, followed by heating and drying to form a pretreatment layer; b) applying the undercoating composition to the surface of the pretreatment layer, followed by heating and drying to form a undercoat layer; And c) coating a clear top coating composition on the surface of the undercoating layer and then heating and drying to form a clear top coat layer, wherein the clear top coating composition comprises a polyester resin, a melamine resin, a pearl pigment, , Silicon dioxide (SiO2), an acrylic resin, a solvent, and the remainder water.

In one embodiment, the pretreatment layer is formed to a thickness of 0.1 to 2 탆 by drying at 80 to 120 캜, wherein the primer layer is formed to a thickness of 10 to 20 탆 by drying at 210 to 240 캜, And dried at a temperature of 210 to 240 캜 to have a thickness of 10 to 20 탆.

The color steel sheet and the manufacturing method thereof according to the present invention realize excellent aesthetic design effects such as texture improvement by embodying the color of the undercoat layer in the clear top layer and the texture of the clear top layer in the clear top layer and incorporating the pearl pigment in the clear top layer, By using zinc plating, it is possible to reduce production cost and reduce cost, and is excellent in surface texture, workability, adhesion (film adhesion), impact resistance, film hardening degree and corrosion resistance, It is effective to realize a similar design to a carvallar pattern which can be seen only in a GL product without the dye leakage and color change in the coating layer due to the protective effect of the clear top layer in the rain after the construction, .

1 is a schematic cross-sectional view of a color steel sheet according to one embodiment of the present invention.
2 is a process flow chart schematically showing a method of manufacturing a color steel sheet according to one embodiment of the present invention.
FIG. 3 is a process drawing showing the change of the coating layer for each process according to the method of manufacturing a color steel sheet according to one embodiment of the present invention.
4 is a photograph showing a surface texture and a product processing state of a steel plate specimen according to Comparative Example 1 of the present invention.
Fig. 5 is a photograph showing corrosion resistance characteristics of a steel plate specimen according to Comparative Example 1 of the present invention. Fig.
6 is a photograph showing a surface texture and a product processing state of the steel plate specimen according to the first embodiment of the present invention.
7 is a photograph showing corrosion resistance characteristics of a steel plate specimen according to Example 1 of the present invention.
8 is a photograph showing the properties (workability, adhesion, impact resistance, coating film hardenability, corrosion resistance) of the steel plate specimen according to Example 1 of the present invention.

Embodiments of the present application will now be described in more detail with reference to the accompanying drawings. It is to be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. So that it can be sufficiently transmitted.

It is to be understood that the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise, and the terms "comprise" Components, components, or combinations thereof, and does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof .

Further, in carrying out the method or the manufacturing method, the respective steps of the method may take place differently from the stated order unless clearly specified in the context. That is, each process may occur in the same order as described, may be performed substantially concurrently, or may be performed in the opposite order.

Hereinafter, the present invention will be described in more detail.

Color steel plate

One aspect of the present invention relates to a steel plate preform; A pretreatment layer formed on the surface of the steel sheet base material; A primer layer formed on the surface of the pretreatment layer; And a clear top layer formed on the surface of the undercoat layer, wherein the clear top coat layer is formed of a cured product of the clear top coat composition, and the clear top coat paint composition is a polyester resin, a melamine resin, a pearl pigment, , Silicon dioxide (SiO2), an acrylic resin, a solvent, and water in the remainder.

Hereinafter, a color steel sheet according to one embodiment of the present invention will be described in detail.

1 is a schematic cross-sectional view of a color steel sheet according to one embodiment of the present invention.

Referring to FIG. 1, a color steel plate 100 according to one embodiment of the present invention includes a steel plate base material 110, a pretreatment layer 130, a undercoating layer 150, and a clear topcoat layer 170.

(Steel plate base material)

The steel sheet base material 110 may be either a hot-rolled steel sheet or a cold-rolled steel sheet, and a plating layer containing zinc, nickel, or the like may be formed on the surface thereof to improve corrosion resistance.

The steel plate base material 110 may be any one selected from a galvanized steel sheet, a galvalume steel sheet, an aluminum-plated steel sheet, and an electrogalvanized steel sheet. For example, a hot-dip galvanized steel sheet (GI) . However, the type is not limited thereto as long as it is for realizing the object of the present invention.

The steel plate base material 110 may have a thickness of 0.2 to 1 mm, for example, 0.3 to 0.8 mm, for example, 0.5 to 0.6 mm. When the color steel sheet according to the present invention is used for the building material in the above-mentioned thickness range, there is an advantage that the color and texture for the layer formation can be easily diversified.

(Pretreatment layer)

The pretreatment layer 130 is formed on the surface of the steel plate base material 110 for the purpose of cleanly treating the surface of the steel plate base material 110 through pickling and degreasing processes before coating.

The pretreatment layer 130 may be formed by applying an anticorrosive coating agent and then drying by heating. Although not shown, the pretreatment layer 130 may be coated on both sides of the steel sheet base material 110.

The pretreatment layer 130 may have a layer thickness of 0.1 to 2 탆, for example, 0.5 to 1.5 탆, for example, 0.8 to 1.2 탆. In the above layer thickness range, the undercoat layer composition can be easily coated after the surface treatment of the steel plate base material 110, so that the undercoat layer 150 described below can be formed under optimum conditions.

(Lower layer)

The undercoat layer 150 is formed on the surface of the pretreatment layer 130 for the purpose of improving the corrosion resistance of the color steel sheet 100 and improving the adhesion of the clear top layer 170 to be described later.

The undercoat layer 150 according to one embodiment of the present invention is not limited to the basic physical properties such as impact resistance, adhesion, and adhesion for the purpose of realizing the object of the present invention, but also includes general color or special color, There is a characteristic that they are implemented together in the undercoat layer 150. In addition, in the clear top layer 170 described later, only the texture is realized, and thus the color of the undercoat layer 150 and the texture of the clear topcoat layer 170 are each 2 won.

The undercoat layer 150 may be formed to have a layer thickness of 10 to 20 탆, for example, 12 to 18 탆, for example, 14 to 16 탆. When the thickness of the undercoat layer 150 is less than 10 mu m, the adhesion with the clear topcoat layer 170 described later is deteriorated. On the other hand, when the thickness of the undercoat layer 150 is more than 20 mu m, There is a problem that the cost is increased and the production efficiency is lowered.

The undercoating layer 150 may be formed of a cured product of a base coating composition comprising a polyester resin, a melamine resin, a pigment, a sulfonic acid, a silicon dioxide (SiO2), an acrylic resin, a solvent, and the remainder water.

Hereinafter, the undercoat composition for forming the undercoat layer 150 will be described in detail.

a) a polyester resin

The polyester resin is a main resin for the pretreatment layer 130, the undercoating layer 150 and the clear topcoat layer 170 in the color steel sheet 100 according to one embodiment of the present invention, and the color steel sheet 100 ) For the purpose of improving the corrosion resistance and processability.

The polyester resin has high crystallinity, high heat resistance, strong chemical resistance, and a relatively high heat distortion temperature of about 235 ° C. The polyester resin may include various types of polyester resins. For example, a polyester resin having an unsaturated group may be dissolved in a polymerizable monomer having the same double bond, and then an initiator and an accelerator may be mixed and polymerized at room temperature. It may also include, for example, silicone modified polyesters. However, the types are not limited thereto as long as they are for realizing the object of the present invention.

The polyester resin may include 53 to 67% by weight, for example, 55 to 65% by weight, for example, 57 to 63% by weight based on 100% by weight of the entire undercoat composition. When the content of the polyester resin is less than 53% by weight, the undercoating composition for coating may be formed to be diluted when the undercoat layer is formed, and may not be easily dried and used. On the other hand, when the content of the polyester resin is more than 67% by weight, there is a problem that the curing property is deteriorated or it is not uniformly applied to the upper part of the pretreatment layer.

b) Melamine resin

The melamine resin may be included as a thermosetting resin having an amino group (-NH 2) for the purpose of enhancing the adhesion of the undercoat layer 150 and realizing excellent coloring and gloss.

The melamine resin can be formed, for example, by dehydration condensation from weakly alkaline formaldehyde through methylmelamine. The melamine resin is colorless and transparent and can be colored beautifully. It is resistant to heat, acid, and solvent, and is excellent in seasonal insulation.

The melamine resin may be contained in an amount of 3 to 7% by weight, for example, 4 to 6% by weight, for example, 4.5 to 5.5% by weight based on 100% by weight of the entire undercoating composition. If the content of the polyester resin is less than 3% by weight, the undercoating composition may be formed in a diluted state and may not be easily dried and used. On the other hand, when the content of the melamine resin is more than 7% by weight, The effect of the addition is no longer exhibited, which causes a problem of an increase in cost and a decrease in production efficiency.

c) Pigment

The pigment may be used to form functions of coloring, hiding and anti-rusting in forming the undercoat layer 150, and may further include various colors to maintain and protect the durability of the coated surface.

The pigments may be selected from TiO2, P2O5, Al2O3, CaO, carbon black, ceramic inorganic pigments and the like depending on the desired color. More specifically, for example, titanium dioxide (TiO2) can be used as the white pigment and chromium (Cr) can be used as the yellow pigment. Carbon black may be used as the black pigment, and iron oxide may be used as the red pigment. Therefore, by including these pigments alone or in combination of two or more kinds, various colors can be exhibited.

The pigment may be included in an amount of 1 to 2% by weight, for example, 1.2 to 1.8% by weight, for example, 1.4 to 1.6% by weight based on 100% by weight of the entire undercoat composition. When the content of the pigment is less than 1% by weight, the anti-rust properties are deteriorated and the desired color can not be sufficiently realized. On the other hand, when the content of the pigment is more than 2% by weight, coloring is rather disturbed, There is a problem that physical properties such as corrosion resistance are deteriorated.

d) Sulfonic acid

The sulfonic acid may be included for the purpose of promoting the reaction between the hydroxyl group-containing resin and the curing agent in the coating layer (coating layer) after coating and drying the undercoating composition for forming the undercoating layer 150.

The sulfonic acid may include, for example, a sulfonic acid compound such as p-toluenesulfonic acid, dodecylbenzenesulfonic acid, dinonylnaphthalenesulfonic acid, dinonylnaphthalene disulfonic acid, or an amine polymer of sulfonic acid compounds of these sulfonic acid compounds. Among them, for example, p-toluenesulfonic acid, dodecylbenzenesulfonic acid, or an amine polymer thereof are preferable because of their excellent reaction promoting effect and excellent physical properties of the resulting coating layer.

The sulfonic acid may be contained in an amount of 1 to 2% by weight, for example, 1.2 to 1.8% by weight, for example, 1.4 to 1.6% by weight based on 100% by weight of the entire undercoat composition. When the added amount of the sulfonic acid is less than 1% by weight, the anti-rust properties are deteriorated and the desired color can not be realized sufficiently. On the other hand, when the added amount of the sulfonic acid exceeds 2% by weight, And there is a problem that the physical properties such as corrosion resistance, impact resistance, adhesion, and workability are deteriorated.

e) silicon dioxide

The silicon dioxide (SiO2)) may be included for the purpose of improving the rustproofing property and increasing the workability at the time of forming the undercoat layer 150 according to one embodiment of the present invention.

The silicon dioxide may be contained in an amount of 1 to 2% by weight, for example, 1.2 to 1.8% by weight, for example, 1.4 to 1.6% by weight based on 100% by weight of the entire undercoat composition. If the added amount of the silicon dioxide is less than 1% by weight, the effect of the addition is insufficient and the anti-corrosive property is deteriorated. On the other hand, when the added amount of the silicon dioxide exceeds 2% by weight, Problems can arise.

f) Acrylic resin

The acrylic resin may be included for the purpose of improving the chemical resistance of the undercoat layer 150 such as solvent resistance and alkali resistance.

The acrylic resin may be at least one selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, 2-hydroxyethyl methacrylate, hydroxypropyl methacrylate, , Diacetone acrylamide, glycidyl methacrylate, vinyl acetate, acrylonitrile, and the like, or a mixture of two or more thereof. However, as long as the object of the present invention can be realized, the kind thereof is not limited thereto.

The acrylic resin may be contained in an amount of 1 to 2% by weight, for example, 1.2 to 1.8% by weight, for example, 1.4 to 1.6% by weight based on 100% by weight of the entire undercoat composition. If the content of the acrylic resin is less than 1% by weight, the workability of the undercoat layer 150 may be deteriorated. On the other hand, if the content of the acrylic resin is more than 2% by weight, ) May be significantly lowered.

g) solvent

The solvent improves workability, viscosity control, compatibility, hydrolytic ability, wettability of various kinds of treating agents, and improves the drying speed after coating the steel sheet when forming the undercoating composition for the undercoating layer 150 May be included for purposes of performing.

The type of the solvent is not particularly limited. Preferably, for example, ethers, aromatic hydrocarbons, ketones, alcohols, esters or amides can be used. More specifically, the solvent is selected from the group consisting of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether , And diethylene glycol dibutyl ether; Aromatic hydrocarbons such as benzene, toluene, xylene, and mesitylene; Ketones such as methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone, and cyclohexanone; Alcohols such as ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol and glycerin; Methylcellosolve acetate, ethylcellosolve acetate, ethyl acetate, butyl acetate, amyl acetate, methyl lactate, ethyl lactate, butyl lactate, 3-methoxypropionate, methyl 3-methoxypropionate, Methoxybutyl acetate, ethylene glycol monoacetate, ethylene glycol diacetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol Monoacetate, diethylene glycol diacetate, diethylene glycol monobutyl ether acetate, propylene glycol monoacetate, propylene glycol diacetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethylene carbonate, propylene carbonate, Lactone, etc. Or a mixture of two or more thereof. Preferred examples of the solvent include a solvent such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexanone, ethyl lactate, butalactate, ethyl 3-ethoxypropionate, Methyl 3-methoxypropionate, and the like.

The solvent may be included in an amount of 25 to 35% by weight, for example, 27 to 33% by weight, for example, 29 to 31% by weight based on 100% by weight of the entire undercoat composition. If the added amount of the solvent is less than 25% by weight, the viscosity of the paint is too high, so that the coating process is difficult, the compatibility with water is lowered and the storage stability may be affected. On the other hand, If the weight% is exceeded, the viscosity of the paint is too low, which makes the coating process difficult, and there is a risk of fire and explosion due to an increase in volatility during application, and the weatherability and appearance of the undercoat layer may be problematic.

h) Water

The water can be appropriately adjusted in such a manner that the amount of the water is included in a proportion of 100% by weight of the entire undercoat composition, depending on the content of the other components of the undercoat composition according to one embodiment of the present invention.

(Clear top layer)

The clear top layer 170 includes pearl pigment particles and the like and is formed on the surface of the undercoat layer 150 for the purpose of realizing an aesthetic design and a beautiful texture of the color steel sheet 100.

In order to realize the object of the present invention, the clear top layer 170 according to one embodiment of the present invention may be formed by removing only the general color or the special color, which is usually implemented in the upper layer, The texture in the undercoat layer 150 has an excellent effect of realizing two-sided texture in the clear top layer 170, respectively.

The clear top layer 170 may have a layer thickness of 10 to 20 占 퐉, for example, a thickness of 12 to 18 占 퐉, for example, a thickness of 14 to 16 占 퐉. If the layer thickness of the clear upper phase layer 170 is less than 10 mu m, there is a problem that the adhesion with the undercoating layer 150 is lowered. On the other hand, when the layer thickness exceeds 20 mu m, There is a problem of increase in cost and deterioration of production efficiency because the amount of coating material used is increased without coating effect.

The clear top coat layer 170 may be formed of a clear top coating composition comprising a polyester resin, a melamine resin, a pearl pigment, an amine compound, silicon dioxide (SiO2), an acrylic resin, a solvent, have.

Hereinafter, the clear top to form the clear top coat layer 170 will be described in detail.

a) a polyester resin

The polyester resin is a main resin for the pretreatment layer 130, the undercoating layer 150 and the clear topcoat layer 170 in the color steel sheet 100 according to one embodiment of the present invention, and the color steel sheet 100 ) For the purpose of improving the corrosion resistance and processability.

The polyester resin has high crystallinity, high heat resistance, strong chemical resistance, and a relatively high heat distortion temperature of about 235 ° C. The polyester resin may include various types of polyester resins. For example, a polyester resin having an unsaturated group may be dissolved in a polymerizable monomer having the same double bond, and then an initiator and an accelerator may be mixed and polymerized at room temperature. It may also include, for example, silicone modified polyesters. However, the types are not limited thereto as long as they are for realizing the object of the present invention.

The polyester resin may contain 44 to 58% by weight, for example, 46 to 56% by weight, for example, 48 to 54% by weight based on 100% by weight of the entire coating composition. If the content of the polyester resin is less than 44% by weight, the clear top coat for forming a clear top layer may also be formed to be dilute and may not be easy to dry and use. On the other hand, when the content of the polyester resin is more than 58% by weight, there is a problem that the curing property is deteriorated or can not be uniformly applied to the upper part of the undercoat layer.

b) Melamine resin

The melamine resin is included as a thermosetting resin having an amino group (-NH 2) for the purpose of enhancing the adhesion of the clear top layer 170 and realizing excellent coloring and gloss.

The melamine resin can be formed, for example, by dehydration condensation from weakly alkaline formaldehyde through methylmelamine. The melamine resin is colorless and transparent and can be colored beautifully. It is resistant to heat, acid, and solvent, and is excellent in seasonal insulation.

The melamine resin may contain 2 to 6% by weight, for example, 3 to 5% by weight, for example, 3.5 to 4.5% by weight based on 100% by weight of the total coating composition. When the content of the melamine resin is less than 2% by weight, the clear coating composition may be diluted and may not be easily dried and used. On the other hand, when the content of the melamine resin is more than 6% by weight, The effect of the addition is no longer exhibited, which causes a problem of an increase in cost and a decrease in production efficiency.

c) Pearl pigment

The pearl pigment is a component of a clear top coat composition which is applied when the clear top layer 170 of the present invention is formed. The pearl pigment is generally used to remove the general color or special color, Purpose.

With the addition of the pearlescent pigment, the present invention has an excellent effect of realizing color in the undercoat layer 150 and texture in each of the clear topcoat layer 170 in two circles. For this, in the present invention, the pearl pigment can realize a color steel sheet having a high texture through a pearl effect which is a granular feeling.

As the pearl pigment, it is preferable to coat the inorganic particles with a metal, a metal oxide or a non-metal oxide to give a pearl luster effect.

Examples of the inorganic particles include inorganic particles commonly used in pearl pigments such as mica, glass, alumina, wollastonite, silica, and mixtures thereof. Preferably, it may include, for example, mica particles, and more preferably, flaky mica particles in the form of flakes.

There is no particular limitation on the size, thickness, etc. of the inorganic particles, but preferably the average particle size is 5 to 15 占 퐉, for example, 6 to 10 占 퐉, for example, 7 to 9 占 퐉 Size is more preferable. When the average particle diameter is less than 5 mu m, the visibility may be lowered. On the other hand, when the average particle diameter is more than 15 mu m, the clear top coat may be clogged or the uniformity of the coating surface may be deteriorated, This may not be easy. That is, in the above-mentioned average particle size range, the storage stability and workability are excellent, and the effect of the texture and the like is increased.

The metal, metal oxide or non-metal oxide used for covering the inorganic particles can be used without particular limitation as long as it is usually used in the production of pearlescent pigments. Examples of the metal or metal oxide include metals such as gold, silver, platinum, palladium, titanium, iron, chromium, aluminum, tin, zinc, magnesium, zirconium, cerium and lithium (TiO2), iron oxide (Fe2O3), chromium oxide (Cr2O3), aluminum oxide (Al2O3), tin oxide (SnO3), or the like, and more specifically, at least one oxide selected from gold, silver, platinum, palladium, , Zinc oxide (ZnO), magnesium oxide (MgO), zirconium oxide (ZrO3), cerium oxide (CeO3), lithium oxide (Li2O), silver oxide (AgO), and combinations thereof. And the non-metal oxide may include silicon dioxide (SiO2).

The pearl pigment may contain from 0.1 to 0.2% by weight, for example from 0.01 to 0.09% by weight, for example from 0.03 to 0.07% by weight, based on 100% by weight of the total coating composition. When the added amount of the pearl pigment is less than 0.1 wt%, the effect of addition is insufficient and it is difficult to realize the pearl effect through the graininess. On the other hand, when the added amount of the pearl pigment is more than 0.2 wt% There is a problem of cost increase and production efficiency deterioration.

d) amine compound

When the amine compound suppresses etching of the plating layer through neutralization of an acid component and the corrosion resistance of the coating layer by zinc (Zn) is deteriorated by etching of the plating layer, corrosion resistance deterioration of the coating layer is suppressed by suppressing the etching of the plating layer And the like.

The amine-based compound may be used alone or in combination of two or more thereof in triethanolamine, diethanolamine, diethylethanolamine, and monoethanolamine.

The amine-based compound may include 0.1 to 1.0% by weight, for example, 0.2 to 0.8% by weight, for example, 0.4 to 0.6% by weight based on 100% by weight of the total amount of the clear coating composition. When the content of the amine compound is less than 0.1 wt%, the effect of addition is insignificant. On the other hand, when the content of the amine compound is more than 1.0 wt%, the solution stability is lowered, There is a problem of increase in production and deterioration of production efficiency.

e) silicon dioxide

The above silicon dioxide (SiO2)) is included for the purpose of improving the rustproofing property and the workability in forming the clear upper phase layer 170 according to one embodiment of the present invention.

The silicon dioxide may comprise from 0.1 to 1.0% by weight, for example from 0.2 to 0.8% by weight, for example from 0.4 to 0.6% by weight, based on 100% by weight of the total coating composition. If the added amount of silicon dioxide is less than 0.1% by weight, the effect of the addition is insufficient and the rust-preventive characteristics are deteriorated. On the other hand, when the added amount of silicon dioxide exceeds 1.0% by weight, Problems can arise.

f) Acrylic resin

The acrylic resin is included for the purpose of improving the chemical resistance of the clear top coat layer 170 such as solvent resistance and alkali resistance.

The acrylic resin may be at least one selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, 2-hydroxyethyl methacrylate, hydroxypropyl methacrylate, , Diacetone acrylamide, glycidyl methacrylate, vinyl acetate, acrylonitrile, and the like, or a mixture of two or more thereof. However, as long as the object of the present invention can be realized, the kind thereof is not limited thereto.

The acrylic resin may contain 0.1 to 1.0% by weight, for example, 0.2 to 0.8% by weight, for example, 0.4 to 0.6% by weight based on 100% by weight of the total coating composition. If the content of the acrylic resin is less than 0.1% by weight, the workability of the clear top coat layer 170 may be deteriorated. On the other hand, when the content of the acrylic resin is more than 1.0% by weight, ) May be significantly lowered.

g) solvent

The clear agent for achieving the clear top coat layer 170 improves workability, viscosity control, compatibility, hydrolytic ability, and wettability of various kinds of treating agents, For the purpose of quickly performing the operation.

The type of the solvent is not particularly limited. Preferably, for example, ethers, aromatic hydrocarbons, ketones, alcohols, esters or amides can be used. More specifically, the solvent is selected from the group consisting of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether , And diethylene glycol dibutyl ether; Aromatic hydrocarbons such as benzene, toluene, xylene, and mesitylene; Ketones such as methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone, and cyclohexanone; Alcohols such as ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol and glycerin; Methylcellosolve acetate, ethylcellosolve acetate, ethyl acetate, butyl acetate, amyl acetate, methyl lactate, ethyl lactate, butyl lactate, 3-methoxypropionate, methyl 3-methoxypropionate, Methoxybutyl acetate, ethylene glycol monoacetate, ethylene glycol diacetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol Monoacetate, diethylene glycol diacetate, diethylene glycol monobutyl ether acetate, propylene glycol monoacetate, propylene glycol diacetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethylene carbonate, propylene carbonate, Lactone, etc. Or a mixture of two or more thereof. Preferred examples of the solvent include a solvent such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexanone, ethyl lactate, butalactate, ethyl 3-ethoxypropionate, Methyl 3-methoxypropionate, and the like.

The solvent may be included in an amount of 20 to 30% by weight, for example, 22 to 28% by weight, for example, 24 to 26% by weight based on 100% by weight of the entire clear coating composition. If the added amount of the solvent is less than 20% by weight, the viscosity of the coating is too high, so that the coating process is difficult, the compatibility with water is lowered and the storage stability may be affected. On the other hand, If it is more than 10% by weight, the viscosity of the paint is too low, which makes the coating process difficult, and there is a risk of fire and explosion due to the increase of volatile components upon application, and the weatherability and appearance of the clear top layer may occur.

h) Water

The water can be appropriately adjusted in such a manner that the amount of the water is included in a proportion of 100% by weight of the entire undercoat composition, depending on the content of the other components of the undercoat composition according to one embodiment of the present invention.

The color steel sheet according to the present invention can realize excellent aesthetic design effects such as texture improvement by embodying the color of the undercoat layer in the clear top layer and the texture in the clear top layer by including the pearl pigment in the clear top layer, It has excellent surface texture, processability, adhesion (film adhesion), impact resistance, coating film hardenability and corrosion resistance, and significantly reduces lot color difference in production coil. After the construction, there is no dye leakage and color change in the coating layer due to the protection effect of the clear top layer in the case of rain, and it is possible to implement a design similar to the car barrier pattern which can be seen only in the GL product at the GI and further reinforce it to the surface texture.

Collar  Manufacturing method

According to another aspect of the present invention, there is provided a method of manufacturing a steel plate, comprising the steps of: a) applying an antireflective coating agent to a surface of a steel sheet base material, followed by heating and drying to form a pretreatment layer; b) applying the undercoating composition to the surface of the pretreatment layer, followed by heating and drying to form a undercoat layer; And c) coating a clear top coating composition on the surface of the undercoating layer and then heating and drying to form a clear top coat layer, wherein the clear top coating composition comprises a polyester resin, a melamine resin, a pearl pigment, , Silicon dioxide (SiO2), an acrylic resin, a solvent and water in the remainder.

Hereinafter, a method for manufacturing a color steel sheet according to one embodiment of the present invention will be described in detail.

FIG. 2 is a process flow chart schematically showing a method of manufacturing a color steel sheet according to one embodiment of the present invention, and FIG. 3 is a process drawing showing a coating layer change according to a process according to a method of manufacturing a color steel sheet according to an embodiment of the present invention .

2 to 3, a method of manufacturing a color steel plate 100 according to an embodiment of the present invention includes a pre-treatment layer forming step S100, a lower layer forming step S200, and a clear upper layer forming step S300 .

(Formation of pretreatment layer)

The pretreatment layer forming step S100 is performed for coating the surface of the steel sheet base material 110 with an antireflective coating agent, followed by drying by heating to form the pretreatment layer 130. [

The pre-treatment layer 130 is formed by performing a surface treatment of the steel plate base material 110 before coating (coating). At this time, any one selected from a hot-dip galvanized steel sheet, an electro-galvanized steel sheet, have. However, the types are not limited thereto as long as they are for realizing the object of the present invention.

The pretreatment layer 130 may be formed by applying a chromate or chromium-free primer to the surface of the steel sheet, preferably applying a chromium-free pretreatment substrate, Air drying at 120 ° C for 3 to 7 seconds. For example, it can be formed by hot air drying at a steel sheet temperature of 90 to 110 DEG C for 4 to 6 seconds. There is an advantage that an excellent high corrosion resistance characteristic can be realized even in a short time in the above drying condition range.

The pretreatment layer 130 may have a layer thickness of 0.1 to 2 탆, for example, a thickness of 0.5 to 1.5 탆, for example, a thickness of 0.8 to 1.2 탆. In the above layer thickness range, the undercoat layer composition can be easily coated after the surface treatment of the steel plate base material 110, so that the undercoat layer 150 described below can be formed under optimum conditions.

(Lower layer formation)

The undercoat layer forming step (S200) is performed for forming a undercoating layer by applying a undercoating composition on the surface of the pretreatment layer 130, followed by heating and drying.

In forming the undercoat layer 150, the coating may be performed in one or more ways such as a spray-squeezing method, a roll coating method, and a dipping method.

The undercoat layer 150 is heated at a first peak dry metal temperature (PMT) temperature of 210 to 240 DEG C for 20 to 50 seconds, for example, at 215 to 235 DEG C for 25 to 45 seconds, for example, at 220 to 230 DEG C For 30 to 40 seconds. If the primary heat drying temperature is lower than 210 ° C, drying may not be performed perfectly and the workability may be lowered. On the other hand, when the primary heat drying temperature is higher than 240 ° C, 130 and the steel plate base material 110 may be deteriorated to cause deterioration of the overall surface characteristics.

The undercoat layer 150 may be formed to have a layer thickness of 10 to 20 탆, for example, 12 to 18 탆, for example, 14 to 16 탆. When the thickness of the undercoat layer 150 is less than 10 mu m, the adhesion with the clear topcoat layer 170 described later is deteriorated. On the other hand, when the thickness of the undercoat layer 150 is more than 20 mu m, There is a problem that the cost is increased and the production efficiency is lowered.

The undercoating layer 150 may be formed of a cured product of a base coating composition comprising a polyester resin, a melamine resin, a pigment, a sulfonic acid, a silicon dioxide (SiO2), an acrylic resin, a solvent, and the remainder water. At this time, the respective components and the content ratios of the undercoat paint composition are as described above, and the description thereof will be omitted.

(Clear top layer formation)

The clear top layer forming step (S300) is performed for the purpose of forming a clear top layer (170) by applying a clear top coating composition, followed by drying and curing.

When the clear top layer 170 is formed, the coating may be performed by one or more methods such as a spray-squeezing method, a roll coating method, and a dipping method.

The clear top layer 170 is heated at a second peak temperature (PMT) temperature of 210 to 240 ° C for 20 to 50 seconds, for example, at 215 to 235 ° C for 25 to 45 seconds, for example, Lt; 0 > C for 30 to 40 seconds. If the second heating and drying temperature is lower than 210 ° C, a sufficient curing reaction may not be achieved and the physical properties may be lowered. On the other hand, when the second heating and drying temperature is higher than 240 ° C, And surface quality may be deteriorated.

 The clear top layer 170 may have a layer thickness of 10 to 20 占 퐉, for example, 12 to 18 占 퐉, for example, 14 to 16 占 퐉. When the layer thickness of the clear upper phase layer 170 is less than 10 mu m, the adhesion with the undercoat layer 150 described above is deteriorated. On the other hand, when the layer thickness exceeds 20 mu m, There is a problem that the cost is increased and the production efficiency is lowered.

The clear top coat layer 170 may be formed of a clear top coating composition comprising a polyester resin, a melamine resin, a pearl pigment, an amine compound, silicon dioxide (SiO2), an acrylic resin, a solvent, have. At this time, since the components and the content ratio of the clear top coat composition are the same as those described above, the description thereof will be omitted.

In the method of manufacturing a color steel sheet according to one embodiment of the present invention, the texture of the undercoat layer is two-colorized in the clear topcoat layer, and the pearl pigment is contained in the clear topcoat layer, It is superior in production cost reduction and cost reduction effect by using hot dip galvanizing and has excellent surface texture, workability, adhesion (film adhesion), impact resistance, coating film hardness and corrosion resistance. And it is effective to prevent the leakage of dye in the coating layer and the color change in the coating layer due to the protective effect of the clear top layer in the rain after the construction, and to implement the design similar to the car barrier pattern only in the GL product in the GI and further to the surface texture.

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

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

Example

Example 1

A pretreatment layer having a thickness of 1.5 탆 was formed on a zinc-plated steel sheet as shown in Table 1 below. Then, a pre-treatment layer of 55% by weight of polyester resin, 5% by weight of melamine resin, 1.5% 1.5% by weight of an acrylic resin, 1.5% by weight of an acrylic resin, 30% by weight of a solvent and 4% by weight of a residual agent was applied to a thickness of 15 탆 and then heated and dried at 224 캜 for forming a primer layer.

Thereafter, on the undercoating layer, 45 wt% of a polyester resin, 3 wt% of a melamine resin, 0.2 wt% of a pearl pigment, 0.8 wt% of an amine compound, 0.5 wt% of silicon dioxide (SiO 2), 0.5 wt% of an acrylic resin, %, And 25% by weight of the remainder of water was coated to a thickness of 15 탆 and then dried at 224 캜 for a second time to form a clear upper layer to prepare a color steel plate specimen.

Examples 2 to 3

A color steel plate specimen was prepared in the same manner as in Example 1, except that the coating composition was completed in the content range shown in Table 1 below.

Comparative Example 1

A color steel sheet specimen was prepared in the same manner as in Example 1 except that the coating composition was completed in the content ranges shown in Table 1, and the coating was applied to the galvanic steel sheet and the pearl pigment was not used in the coating composition.

Comparative Example 2

A color coated steel sheet specimen was prepared in the same manner as in Example 1, except that the coating composition was used in the content ranges shown in Table 1 below, and each of the pigments in the clear top coating composition was replaced with an excessive amount of pigments.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Ha
Degree

Degree
Ryo
article
castle
water Polyester resin 55 60 65 55 55 Melamine resin 5 4 6 4.5 5.2 Pigment 1.5 1.2 1.6 0.5 10 Sulfonic acid 1.5 1.6 1.2 1.5 1.6 SiO2 1.5 1.2 1.2 1.5 1.2 Acrylic resin 1.5 1.5 1.5 1.5 1.5 solvent 30 30 22.5 30 25 water 4 0.5 One 5.5 0.5 Total content
(weight%) 100 100 100 100 100 Big
Lee
uh
Prize
Degree

Degree
Ryo
article
castle
water Polyester resin 45 49 55 46 49 Melamine resin 3 4 5 2.9 3.6 Pearl pigment 0.2 0.1 0.1 0 5 Amine compound 0.8 0.5 0.5 0.1 0.5 SiO2 0.5 0.5 0.5 0.5 0.2 Acrylic resin 0.5 0.5 0.5 0.5 0.3 solvent 25 25.4 29.4 25 25.4 water 25 20 9 25 16 Total content
(weight%) 100 100 100 100 100

 (Component:% by weight)

Test Example

The properties such as surface texture, workability, film adhesion (adhesion), impact resistance, coating film hardenability and corrosion resistance of the color steel plate specimens according to Examples 1 to 3 and Comparative Examples 1 and 2 were evaluated as follows, Respectively.

(1) Processability

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

Good (O): No cracks

Bad (X): Cracked

(2) Coating film adhesion (adhesion)

The film adhesion was evaluated by cross-cutting 10 lines at intervals of 1 mm width x 1 mm on a flat sample coated with paints, making 100 squares with an area of 1 mm2, and further cutting the cross cutting plate to a 6 mm height When the adhesive tape was last applied, the peeling of 100 pieces of the coating film particles was evaluated as follows.

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

Defect (X): Peeling of the cross cutting part

(3) Impact resistance

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

Good (O): No cracks

(4) Coating hardness

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

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

Defective (X): resin peeling or swelling occurs

(5) Corrosion resistance

The corrosion resistance was evaluated by 500 hour neutral salt spray test, and then peeling, peeling, corrosion of the plated surface and occurrence of rust were confirmed. The evaluation criteria are as follows.

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

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

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Processability ◎ ○ ◎ X X Coating adhesion ○ ◎ ○ △ △ Impact resistance ◎ ○ ◎ ○ △ Coating hardness ○ ○ ○ △ ○ Corrosion resistance ○ ○ ○ ○ △

Results of physical property evaluation

Fig. 4 is a photograph showing the surface texture and the product processing state of the steel plate specimen according to Comparative Example 1 of the present invention, and Fig. 5 is a photograph showing corrosion resistance characteristics of the steel plate specimen according to Comparative Example 1 of the present invention.

4 to 5, when the pearl pigment was applied to the overcoating paint composition in an over-clear paint composition as in Comparative Example 2, the workability (Fig. 4-b)) was not good and the paint film adhesion, impact resistance And corrosion resistance are both found to be favorable.

Particularly, as in Comparative Example 1, the surface of the galvanic steel sheet was painted, and when the pearl pigment was not used in the clear coating composition, the surface texture was poor (Fig. 4-a)) and the workability (Fig. 4-b) , The entire coating film is peeled off, and the adhesion and the film hardening degree are weakened.

FIG. 6 is a photograph showing the surface texture and the product processing state of the steel plate specimen according to the first embodiment of the present invention, FIG. 7 is a photograph showing corrosion prevention characteristics, and FIG. 8 is a graph showing the physical properties (workability, Impact resistance, film hardening degree, and corrosion resistance) characteristics, and Fig. 9 is a photograph showing an example used as a building material for a water tray of a steel plate specimen.

6 to 9, like the first to third embodiments, the present invention has excellent surface texture and excellent basic properties such as workability, adhesion, impact resistance, coating film hardenability and corrosion resistance, It can be seen that there is a feature that can be used in various applications such as water pan. In particular, it is common to implement common colors or special colors in the undercoat layer, which are typically implemented in the topcoat layer, and at the same time only the texture in the clear topcoat layer, Can be realized to be 2 won each.

Accordingly, the color steel sheet according to the present invention and the method of manufacturing the same according to the present invention can realize a color in the undercoat layer and a texture in the clear topcoat layer, respectively, and the pearl pigment is included in the clear topcoat layer. By implementing the design effect and using the hot dip galvanizing, it is possible to reduce the production cost and reduce the cost, and it has excellent surface texture, processability, adhesion (film adhesion), impact resistance, film hardenability and corrosion resistance, ) Clear difference in color difference is reduced and clear after rain. Clear effect on the top layer prevents dye leaks and color changes in the coating layer. It also implements the design similar to the " .

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill 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. This is possible.

Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims as well as the appended claims.

100 Color steel plate 110 Steel plate base material
130 Pretreatment layer 150 Lower layer
170 Clear top layer

Claims (8)

Steel plate base material;
A pretreatment layer formed on the surface of the steel sheet base material;
A primer layer formed on the surface of the pretreatment layer; And
A clear top layer formed on the surface of the undercoat layer;
/ RTI >
The clear top coat layer is formed of a clear top coat with the coating composition,
The clear top coat composition comprises: a) 44 to 58% by weight of a polyester resin; b) 2 to 6% by weight of a melamine resin; c) 0.1 to 0.2% by weight of pearl pigment; d) from 0.1 to 1.0% by weight of an amine compound; e) from 0.1 to 1.0% by weight of silicon dioxide (SiO2); f) 0.1 to 1% by weight of an acrylic resin; g) 20 to 30% by weight of solvent; And h) the balance water,
The undercoat layer is formed of a cured product of the undercoating composition,
The undercoating composition comprises: a) 53 to 67% by weight of a polyester resin; b) 3 to 7% by weight of a melamine resin; c) 1 to 2% by weight of pigment; d) 1 to 2% by weight of sulfonic acid; e) 1-2% by weight of silicon dioxide (SiO2); f) 1 to 2% by weight of an acrylic resin; g) 25 to 35% by weight of solvent; And h) the remainder of the water.
delete The method according to claim 1,
The pearl pigment has an average particle diameter of 5 to 15 占 퐉,
Wherein the inorganic particles are coated with a metal, a metal oxide or a non-metal oxide.
The method of claim 3,
Wherein the inorganic particles are mica, glass, alumina, wollastonite, silica or a mixture thereof,
The metal or metal oxide is a metal or an oxide thereof which is gold, silver, platinum, palladium, titanium, iron, chromium, aluminum, tin, zinc, magnesium, zirconium,
Characterized in that the non-metallic oxide is silicon dioxide.
delete delete a) applying a coating agent to the surface of the steel sheet base material, followed by heating and drying to form a pretreatment layer;
b) applying the undercoating composition to the surface of the pretreatment layer, followed by heating and drying to form a undercoat layer; And
c) applying a clear top coating composition to the surface of the undercoat layer, followed by heating and drying to form a clear top coat layer;
Lt; / RTI >
The clear top coat composition comprises: a) 44 to 58% by weight of a polyester resin; b) 2 to 6% by weight of a melamine resin; c) 0.1 to 0.2% by weight of pearl pigment; d) from 0.1 to 1.0% by weight of an amine compound; e) from 0.1 to 1.0% by weight of silicon dioxide (SiO2); f) 0.1 to 1% by weight of an acrylic resin; g) 20 to 30% by weight of solvent; And h) the balance water,
The undercoating composition comprises: a) 53 to 67% by weight of a polyester resin; b) 3 to 7% by weight of a melamine resin; c) 1 to 2% by weight of pigment; d) 1 to 2% by weight of sulfonic acid; e) 1-2% by weight of silicon dioxide (SiO2); f) 1 to 2% by weight of an acrylic resin; g) 25 to 35% by weight of solvent; And h) the remainder of the water.
8. The method of claim 7,
The pretreatment layer is formed to a thickness of 0.1 to 2 탆 by drying at 80 to 120 캜,
The undercoating layer is formed to a thickness of 10 to 20 탆 by drying at 210 to 240 캜,
Wherein the clear top layer is formed to a thickness of 10 to 20 占 퐉 by drying at 210 to 240 占 폚.

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