KR102698073B1 - Coating composition for pre-coated metal color sheet, pre-coated metal color sheet and method for manufacturing the same - Google Patents

Abstract

The PCM color steel sheet having heat-insulating and heat-radiating properties is a PCM color steel sheet applied to roofing materials or walls, and includes a base steel sheet including at least one of a chemical treatment layer, a rust-proof layer, and a lower coating layer, a base layer including a heat-radiating pigment and a heat-insulating pigment, a printing layer formed on the base layer and including a heat-insulating pigment or a heat-radiating pigment and a heat-insulating pigment, and a transparent layer formed on the printing layer.

Description

Coating for PCM color steel sheet having heat-insulating and heat-radiating properties, PCM color steel sheet and method for manufacturing the same {COATING COMPOSITION FOR PRE-COATED METAL COLOR SHEET, PRE-COATED METAL COLOR SHEET AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a paint for PCM color steel sheets having heat-insulating and heat-radiating properties, a PCM color steel sheet, and a method for manufacturing the same, and more specifically, to a paint for PCM color steel sheets having excellent corrosion resistance and weather resistance and excellent heat-insulating and heat-radiating properties, a PCM color steel sheet having heat-insulating and heat-radiating properties, and a method for manufacturing the same, by forming a base layer having heat-insulating properties and a printing layer having heat-insulating properties without impeding the adhesion of the base and a transparent layer.

Metal coating methods are generally classified into the post-coating method, which is painted after the molding process, and the pre-coating method, which is painted before the molding process. The post-coating method has low equipment costs and is advantageous for small-scale production, but has the problem that it is difficult to produce uniform products and mass production. On the other hand, the pre-coating method has the advantages of stability of work, uniformity of products, reduction of paint loss, less environmental pollution, and mass production in a short period of time.

Here, the steel plate that is coated with the metal to be processed using the pre-coating method is called PCM (Pre-coated Metal) color steel plate, and the paint used for this is called PCM paint.

The metal plates used in color steel plates are of two types: sheet type cut to a certain size and coil type rolled. Most color steel plate production processes adopt coil coating method that automatically and continuously coats metal coils. This color steel plate has the advantages of being able to promote process rationalization, quality stability, resource conservation, pollution control, energy conservation, shortening of construction period, and cost reduction.

These PCM color steel sheets (hereinafter referred to as color steel sheets) have a variety of colors and patterns, and are gorgeous in appearance and do not require reprocessing, so they have been widely used in home appliances such as washing machines, refrigerators, and TVs, building materials, and automobiles. Recently, their market has been expanding for indoor and outdoor interior use by giving the surface a three-dimensional effect or texture.

The color steel plate is usually composed of a chemical treatment layer, an optional anti-corrosion layer, a base layer, a printing layer, and a transparent layer on a base steel plate. Specifically, such a color steel plate can be manufactured by performing a chemical treatment, such as a degreasing treatment, on the surface of the base steel plate to improve the corrosion resistance of the steel plate, performing a primer treatment to improve the corrosion resistance and workability, forming a base layer and a printing layer on the surface, forming a clear layer (transparent layer) which is a transparent paint layer that protects the printing layer and improves the appearance, and in some cases forming a protective film layer on the surface to prevent scratches and adhesion of external contaminants.

Color steel plates may include printed steel plates in which a pattern is transferred using a printing roll and a transfer roll formed through a gravure offset printing process. In addition, steel plates may be coated with a double-sided paint as needed.

The most common color steel sheets used for building materials are pre-treated metal sheets with a primer coating of an average of 5㎛, a topcoat or base coating of an average of 15~20㎛, a transparent layer of an average of 10~15㎛ after printing the printed layer, and a double-sided paint of 5~10㎛ on the back. These color steel sheets have a variety of colors and patterns, and their appearance is gorgeous and they do not require reprocessing, so they have been widely used in building materials, and their market is expanding for indoor and outdoor interior use.

The main component of the paint for colored steel plates is provided in the form of pigments and additives mixed and dispersed in a binder containing an organic resin, a hardener, and a solvent. When the paint is applied to the surface and baked, the solvent evaporates and the organic resin hardens through a heat reaction to form a coating film, and at this time, the original performance of the colored steel plate is exhibited.

Recent rapid urban development has caused tropical nights due to the urban heat island phenomenon and increased health damage due to heat illness, and it can also act as a factor in causing urban flooding and air pollution, so it is urgent to develop measures to suppress or alleviate this. In response to this, the development of improved PCM color steel plates with heat insulation and heat dissipation functions is required.

Korean Patent Publication No. 10-2019-0106019

The object of the present invention is to solve the above problems, and to provide a paint for PCM color steel sheet having heat-insulating and heat-dissipating properties, which can form a PCM color steel sheet having excellent corrosion resistance and weather resistance as well as excellent heat-insulating properties by forming a base layer having heat-insulating properties and heat-dissipating properties, and a printing layer having heat-insulating properties and/or heat-dissipating properties without hindering the adhesion of the base layer and a transparent layer.

The object of the present invention is to solve the above problems, and the technical problem is to provide a PCM color steel sheet having excellent corrosion resistance and weather resistance as well as excellent heat-insulating performance, by including a base layer having heat-insulating properties and heat-radiating performance, and a printing layer having heat-insulating properties and/or heat-radiating properties without impeding the adhesion of the base layer and a transparent layer.

In addition, the technical task is to provide a method for manufacturing a PCM color steel sheet having excellent corrosion resistance and weather resistance as well as heat insulation and heat dissipation properties by forming a base layer having heat-insulating properties and heat-radiating performance and including a printing layer having heat-insulating properties and/or heat-radiating properties without impeding the adhesion of the base layer and a transparent layer.

In order to achieve the above object, a paint for PCM color steel sheet having heat-insulating and heat-radiating properties according to one embodiment of the present invention is printed on a base steel sheet including at least one of a chemical treatment layer, a rust-proof layer, and a lower layer, and includes a base layer paint including 40 to 65 wt% of a binder resin, 3 to 10 wt% of a melamine cured resin, 1 to 35 wt% of a heat-insulating pigment, 1 to 35 wt% of a heat-radiating pigment, 0.5 to 10 wt% of an additive, 0.3 to 3 wt% of an acid catalyst, and a remaining organic solvent, and a printed layer paint printed on a bay layer formed with the above bay layer paint, and including 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 0.3 to 3 wt% of an additive, and a remaining organic solvent.

In order to achieve the above object, a PCM color steel plate having heat-insulating and heat-radiating properties according to one embodiment of the present invention comprises a base steel plate including at least one of a chemical treatment layer, a rust-proof layer, and a lower layer, a base layer including a heat-radiating pigment and a heat-insulating pigment, a printing layer formed on the base layer and including a heat-insulating pigment or a heat-radiating pigment and a heat-insulating pigment, and a transparent layer formed on the printing layer.

According to one embodiment, the base layer is formed of a base layer paint including 40 to 65 wt% of the binder resin, 3 to 10 wt% of the melamine cured resin, 1 to 35 wt% of a heat-insulating pigment, 1 to 35 wt% of a heat-dissipating pigment, 0.5 to 10 wt% of an additive, 0.3 to 3 wt% of an acid catalyst, and a residual organic solvent.

In one embodiment, the print layer is formed by a print layer paint including 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 1 to 30 wt% of a heat-dissipating pigment, 0.3 to 3 wt% of an additive, and a remaining organic solvent. In another embodiment, the print layer is formed by coating a print layer paint including 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 0.3 to 3 wt% of an additive, and a remaining organic solvent.

According to one embodiment, the binder resin may include at least one of a polyester resin, a polyurethane resin, an acrylic resin, a silicone-modified polyester resin, an alkyd resin, an epoxy resin, and a fluororesin.

In one embodiment, the heat-insulating pigment comprises a pigment pretreated with a zirconium and aluminum compound, and the heat-dissipating pigment may comprise at least one metallic inorganic pigment selected from the group consisting of titanium oxide, zinc oxide, indium oxide, tin oxide, antimony tin oxide, indium tin oxide, molybdenum oxide, tantalum oxide, vanadium pentoxide, niobium oxide, boron nitronite, and aluminum oxide.

According to one embodiment, a PCM color steel plate having heat-insulating and heat-radiating properties may have a TSR (Total Solar Reflectance) value, which is an indicator of heat-insulating performance, of 0.25 or more.

In order to achieve the above object, a method for manufacturing a PCM color steel sheet having heat-insulating and heat-radiating properties according to one embodiment of the present invention comprises the steps of: providing a base steel sheet including at least one of a chemical treatment layer, a rust-proof layer, and a lower layer; forming a base layer including a heat-radiating pigment and a heat-insulating pigment on the base steel sheet; forming a printed layer including a heat-insulating pigment or a heat-radiating pigment and a heat-insulating pigment on the base layer; and forming a transparent layer on the printed layer.

According to one embodiment, the base layer is formed of a base layer paint including 40 to 65 wt% of a binder resin, 3 to 10 wt% of a melamine cured resin, 1 to 35 wt% of a heat-insulating pigment, 1 to 35 wt% of a heat-dissipating pigment, 0.5 to 10 wt% of an additive, 0.3 to 3 wt% of an acid catalyst, and a residual organic solvent.

In one embodiment, the print layer is formed by a print layer paint containing 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 0.3 to 3 wt% of an additive, and a remaining organic solvent. In another embodiment, the print layer is formed by coating a print layer paint containing 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 0.3 to 3 wt% of an additive, and a remaining organic solvent.

The PCM color steel sheet having heat-insulating and heat-radiating properties of the present invention comprises a base layer having heat-insulating and heat-radiating properties, and a printing layer having heat-insulating and/or heat-radiating properties without impeding the adhesion of the base layer and a transparent layer, thereby ensuring excellent corrosion resistance and weather resistance as well as excellent heat-insulating performance. Such a PCM color steel sheet having heat-insulating and heat-radiating properties can reduce and suppress the urban heat island phenomenon when introduced into roofing materials or walls.

Hereinafter, a paint for PCM color steel sheet having heat-insulating and heat-dissipating properties, a PCM color steel sheet, and a manufacturing method thereof according to one embodiment of the present invention will be described in detail.

The present invention may have various modifications and various forms, and thus specific embodiments thereof will be described in detail herein. However, this is not intended to limit the present invention to a specific disclosed form, but should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprises" or "has" and the like are intended to specify the presence of a combination of features, numbers, steps, components, or the like described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, components, or combinations thereof.

Meanwhile, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. Terms defined in commonly used dictionaries, such as those defined in common dictionaries, should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and shall not be interpreted in an idealized or overly formal sense, unless explicitly defined in this application.

Paint for PCM color steel sheet with heat-insulating and heat-radiating properties and PCM color steel sheet

According to one embodiment of the present invention, a PCM color steel sheet having heat-insulating and heat-radiating properties is a PCM color steel sheet applied to roofing materials or wall materials, and includes a base steel sheet including at least one of a chemical treatment layer, a rust-proof layer, and a lower coating layer, a base layer including a heat-radiating pigment and a heat-insulating pigment, a printing layer formed on the base layer and including a heat-insulating pigment or a heat-radiating pigment and a heat-insulating pigment, and a transparent layer formed on the printing layer.

The heat-insulating and heat-dissipating PCM color steel sheet paint applied to form the heat-insulating and heat-dissipating PCM color steel sheet of the present invention includes a base layer paint printed on a base steel sheet including at least one of a chemical treatment layer, a rust-preventive layer, and an undercoat layer, and includes a binder resin, a melamine cured resin, a heat-insulating pigment, a heat-dissipating pigment, an additive, an acid catalyst, and an organic solvent, and a printed layer paint printed on a base layer and including a binder resin, a heat-insulating pigment, an additive, and an organic solvent.

As an example, the above-described base steel plate (or base steel plate) may be, but is not limited to, a metal plate itself or a steel plate plated with a non-ferrous metal such as zinc or aluminum. For example, the base steel plate may be, but is not limited to, a hot-dip galvanized steel plate, an alloyed hot-dip galvanized steel plate, an electrogalvanized steel plate, a hot-dip aluminum-zinc alloy-plated steel plate, a cold-rolled steel plate, a zinc hot-dipped steel, an electro-galvanized steel, an alloy-plate steel, a copper sheet, a tin-plate steel, or an aluminum plate.

The above-mentioned chemical treatment layer is painted on the base steel plate, and it is preferable to include a pretreatment layer treated with a chemical film to secure adhesion and rust prevention between the base steel plate and the lower layer. The rust prevention layer (or lower layer) must be able to exhibit adhesion to the base steel plate and rust prevention for a certain period of time or longer. It can be selectively applied depending on the molding or physical properties that require a primer paint for PCM.

The above base layer is a coating layer containing a heat-dissipating pigment and a heat-insulating pigment, and should be applied while considering technical aspects such as transferability with the printed layer and adhesion after the printed layer dries, and is characterized by imparting heat-insulating performance together with the printed layer.

As an example, the base layer is formed by coating and then curing a base layer paint including a binder resin, a melamine curable resin, a heat-insulating pigment, a heat-radiating pigment, an additive, an acid catalyst, and a remaining organic solvent. Specifically, the paint for forming the base layer includes 40 to 65 wt% of a binder resin, 3 to 10 wt% of a melamine curable resin, 1 to 35 wt% of a heat-insulating pigment, 1 to 35 wt% of a heat-radiating pigment, 0.5 to 10 wt% of an additive, 0.3 to 3 wt% of an acid catalyst, and a remaining organic solvent.

The binder resin applied to the base layer paint included in the paint for PCM color steel sheet having heat-insulating and heat-radiating properties may use at least one of polyester resin, polyurethane resin, acrylic resin, silicone-modified polyester resin, alkyd resin, epoxy resin, and fluororesin.

The binder resin mentioned above can be applied in a range of about 40 to 65 wt% based on the total weight of the base layer paint. However, if the content of the binder resin is less than 40 wt%, the processability and film flexibility of the paint are reduced, and the adhesion with the lower layer is poor, so that the performance expected from the base layer paint is not exhibited. In addition, if the content of the binder resin exceeds 65 wt%, the film hardness of the base layer becomes weak or the color hiding power is reduced, so that the weather resistance and heat insulation effect of the color steel plate in the future are lowered, and so on.

In this embodiment, a polyester resin is used as an example for explaining a binder resin, but the example of the resin does not limit the present invention. As an example, a polyester resin applied as a binder resin of the present invention is a polyester resin having a hydroxyl group at a terminal through an ester reaction by condensation of a polybasic acid and a polyhydric alcohol, and has excellent transferability with a printed layer and adhesion after the printed layer is dried, and may have an average molecular weight of about 10,000 to 20,000, a TG(10 to 20)14, and an OH VALUE (10 to 30)18.

It acts as a melamine curing resin hardener applied to the base layer paint for forming the above-mentioned base layer, and acts to cause curing with the binder resin. The above-mentioned melamine resin can be included in an amount of about 3 to 10 wt% based on the total weight of the base layer paint. If the content is 10 wt% or more, there are problems such as a decrease in processability and film flexibility, and poor adhesion to the transparent layer, and if it is less than 3 wt%, there is a problem that it is difficult to expect the performance of the base layer paint due to excessive adhesion to the transparent layer due to non-curing caused by a decrease in the degree of curing.

Examples of heat-insulating pigments applied to the base layer paint for forming the above-mentioned base layer include pigments pretreated with zirconium and aluminum compounds, and may be used alone or in combination of two or more. Specifically, it is preferable that the heat-insulating pigment be a white or colored pigment pretreated with zirconium and aluminum compounds. Such heat-insulating pigments may be used alone or in combination of two or more.

An example of a heat-dissipating pigment applied to a base layer paint for forming the above-mentioned base layer is a metallic inorganic pigment for heat dissipation.

Examples of the above metallic inorganic pigments include titanium oxide, zinc oxide, indium oxide, tin oxide, antimony tin oxide, indium tin oxide, molybdenum oxide (MoO3), tantalum oxide (Ta2O5), vanadium pentoxide (V2O5), niobium oxide (Nb2O5), boron nitride (BN), aluminum oxide (AL2O3), etc.

As an example, the metallic inorganic pigment, which is the heat-dissipating pigment, may have a particle size of 50 to 600 nm, and a pigment of a series with excellent heat resistance, chemical resistance, weather resistance, and corrosion resistance is recommended to ensure long-term weather resistance of 20 years or more, but two or more types of metallic pigments or inorganic pigments may be mixed and used depending on the color selection.

The heat-insulating pigment and heat-radiating pigment applied to the above-mentioned base layer paint can be used within the range of 1 to 35 wt%, respectively. However, if the content of the heat-insulating pigment and heat-radiating pigment is less than 1 wt%, the hiding power and heat-insulating and heat-radiating properties are reduced, and it is difficult to implement the desired color. If the content exceeds 35 wt%, problems such as reduced workability occur.

As an example, it is more preferable to use the heat-insulating pigment and heat-radiating pigment applied to the base layer paint in an amount of 5 to 30 wt%, respectively.

The acid catalyst applied to the base layer paint for forming the above base layer serves to promote the curing of the base layer formed together with the melamine curing resin, and is preferably applied at 0.3 to 3 wt% in the entire base layer paint.

If the amount of the acid catalyst used is less than 0.3% by weight, it is difficult to maintain the properties of the base layer due to under-curing of the formed base layer, and if it exceeds 3% by weight, popping may occur due to over-curing of the base layer.

The basic components of the base layer paint for forming the above base layer include binder resin, pigment, hardener, catalyst, and solvent, but additives are used to satisfy many properties required for forming the base layer.

Examples of the above additives include, but are not limited to, leveling agents, antifoaming agents, dispersing agents, UV stabilizers (light stabilizers, UV absorbers), surface protection agents, etc. The above-mentioned additives may be used alone or in combination of two or more depending on the coating conditions or required properties.

The additive applied to the present invention can be used at 0.5 to 10 wt% based on the total weight of the base layer paint. If the content of the additive is less than 0.5 wt%, problems such as particle clumping, bubble generation, and chattering may occur during the painting work to form the base layer, which may lower the painting workability or lower the quality of the appearance of the formed base layer. On the other hand, if it exceeds 10 wt%, excessive use may result in a decrease in physical properties and an increase in product cost.

As an example, the additives described above may include dispersants, surface protectors, and UV stabilizers. In addition, the UV stabilizer included in the additive is applied to improve the weather resistance of the coating film of the color steel plate by blocking and absorbing UV rays, and can be classified into a light stabilizer and a UV absorber, and may be used alone or in combination of two or more.

The organic solvent applied to the above base layer paint plays a role in controlling the viscosity of the paint and is used when the paint is difficult to paint due to lack of fluidity or high viscosity. As an example, the organic solvent can be used within the range of 10 to 35 wt% based on the total weight of the paint. If the content is 35 wt% or more, the viscosity is too low, causing problems with the storability and painting workability of the paint, and if it is less than 10 wt%, the viscosity is too high, preventing the expected performance of the base paint in terms of painting workability. If there is no problem with the viscosity control and surface appearance of the paint, a commonly used organic solvent can be used, and it is preferable to use an organic solvent having a boiling point of 120 to 250°C.

The printing layer included in the PCM color steel plate having heat-insulating and heat-radiating properties of the present invention is formed on the base layer, and is a printing film having a specific pattern or specific design while having heat-radiating and heat-insulating properties by including a heat-radiating pigment and a heat-insulating pigment.

In one embodiment, the print layer is formed by a print layer paint comprising 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 1 to 30 wt% of a heat-dissipating pigment, 0.3 to 3 wt% of an additive, and a remaining organic solvent. In another embodiment, the print layer is formed by coating a print layer paint comprising 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, and a remaining organic solvent.

If the content of the binder resin constituting the printing layer paint used to form the above printing layer exceeds 70 wt%, the drying property of the printing layer may be reduced and the printing workability may be degraded due to high viscosity, and if it is less than 25 wt%, the adhesion between the base layer and the transparent layer may be reduced or problems with the printing workability, such as ink spreading due to low viscosity, may occur.

Specific descriptions of the binder resin, heat-insulating pigment, heat-radiating pigment, additives, and organic solvent applied to the above-mentioned printed layer paint are omitted to avoid duplication since they have been specifically described in the base layer.

The transparent layer included in the PCM color steel plate having heat-insulating and heat-radiating properties of the present invention is formed on the printing layer using a transparent layer paint. The transparent layer paint according to one embodiment may have a composition including 40 to 64 wt% of a polyester resin as a binder resin, 5 to 25 wt% of a melamine cured resin, 0.3 to 3 wt% of an acid catalyst, 1 to 10 wt% of an additive, and a residual organic solvent. As another embodiment, the transparent layer paint may further include 1 to 10 wt% of particles.

The particles applied to the above transparent layer paint can be selectively used for the purpose of texture expression and gloss control. Products with an average particle size of 5 to 60 ㎛ can be applied, and when using a product of 60 ㎛ or more, problems such as deterioration of painting workability and appearance quality due to particle dragging, etc., may occur, and when using a product of 5 ㎛ or less, the gloss reduction is small compared to the amount input, so excessive input may cause problems such as viscosity and increased cost.

The particles mentioned above can be inorganic or organic particles and can be selectively used depending on the intended use and required properties. Examples of the particles mentioned above include amorphous silica, PMMA (polymethyl methacrylate) particles, etc.

A PCM color steel plate comprising a base layer including a heat-dissipating pigment and a heat-insulating pigment, a printing layer including the heat-dissipating pigment and the heat-insulating pigment, and a transparent layer formed on the printing layer has excellent heat-insulating performance as a TSR (Total Solar Reflectance), which is an indicator of heat-insulating performance, is 0.25 or higher.

Manufacturing of PCM color steel sheet with heat-insulating and heat-radiating properties

According to one embodiment of the present invention, a PCM color steel plate can be manufactured by performing the steps of: providing a base steel plate including at least one of a chemical treatment layer, an anti-corrosion layer, and an undercoat layer; forming a base layer including a heat-dissipating pigment and a heat-insulating pigment on the base steel plate; forming a printed layer including a heat-insulating pigment on the base layer; and forming a transparent layer on the printed layer.

According to one embodiment, the base layer can be formed by coating and then curing a base layer paint containing 40 to 65 wt% of a binder resin, 3 to 10 wt% of a melamine curable resin, 1 to 35 wt% of a heat-insulating pigment, 1 to 35 wt% of a heat-dissipating pigment, 0.5 to 10 wt% of an additive, 0.3 to 3 wt% of an acid catalyst, and a remaining organic solvent.

In one embodiment, the print layer is formed by a print layer paint including 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 1 to 30 wt% of a heat-dissipating pigment, 0.3 to 3 wt% of an additive, and a remaining organic solvent. In another embodiment, the print layer is formed by coating a print layer paint including 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 0.3 to 3 wt% of an additive, and a remaining organic solvent.

According to one embodiment, the transparent layer can be formed by coating and then curing a transparent layer paint containing 40 to 65 wt% of a polyester resin as a binder resin, 5 to 25 wt% of a melamine curable resin, 0.3 to 3 wt% of an acid catalyst, 1 to 10 wt% of an additive, and a remaining organic solvent.

Specific descriptions of the binder resin, heat-insulating pigment, heat-dissipating pigment, acid catalyst, additives, and organic solvent selectively applied to the base layer paint, printed layer paint, and transparent layer paint have been specifically described above, and are therefore omitted to avoid duplication.

Hereinafter, the present invention will be described more specifically based on examples and comparative examples, and the present invention is not limited to the following examples.

Evaluation of PCM steel sheet with formed base layer

Each base layer paint having the composition described in Table 1 below was applied on a substrate having a steel plate, a chemical treatment layer, and an anti-rust layer, and then each base layer having a thickness of 15 μm was manufactured by heating, cooling, and drying at 200 to 250°C.

Base layer paint Example 1 Example 2 Comparative Example 1 Comparative Example 2 Binder resin 500 500 600 300 Heat-resistant pigment 80 230 0 150 Heat dissipating pigment 160 10 0 100 General weapon pigment 0 0 30 30 Melamine resin 50 50 100 210 Organic solvent 150 150 210 150 Acid catalyst 10 10 10 10 Additives 50 50 50 50 　 1000g 1000g 1000g 1000g

In the table 1 below, polyester resin K6-0503 (manufacturer: Noroo Paint) was used as the binder resin, CARBON BLACK was used as the general pigment, IR BLACK was used as the heat-insulating pigment, R-960 (manufacturer: DUPONT (USA)) as the heat-radiating pigment (metallic inorganic pigment), CYMEL-303 (manufacturer: CYTEC) as the melamine resin, KOCOSOL #100 / KOCOSOL #150 (manufacturer: SK Energy) as the organic solvent, dinonylnaphthalene sulfonic acid as the acid catalyst, and additives: acrylic additives, etc. were used.

Thereafter, the degree of curing, processability, adhesion, chemical resistance, and heat-insulating effect of the bay layers of Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated, respectively, and the results are disclosed in Table 2 below.

Physical properties Example 1 Example 2 Comparative Example 2 Comparative Example 1 Hardening degree Good Good Good Good Processability Good Good error Good Adhesion Good Good Good Good Pharmaceutical Good Good Good Good Heat insulation effect Good Good error error TSR value (0.25 or higher is good) 0.289 0.266 0.150 0.047

As can be seen from the results in Table 2, it was confirmed that the TSR values indicating physical properties and heat insulation performance were superior to those of the specimens formed with the bay layers of Examples 1 and 2 in terms of processability and Comparative Examples 1 and 2.

On the other hand, in the case of the base layer of Comparative Example 2, although the heat-insulating pigment was used within the scope of the present invention, a problem occurred in which the heat-insulating performance was significantly reduced due to the use of a general pigment. In other words, it was confirmed from the above results that the base layer paint applied when forming the base layer of the present invention should not contain even a small amount of general pigment.

Evaluation of PCM steel sheets with printed and transparent layers formed

Each printing layer ink having the composition described in Table 3 below was printed on a substrate formed with a steel plate, a chemical treatment layer, and an anti-rust layer using the gravure offset method to manufacture a printing layer.

Example 3 Example 4 Comparative Example 3 Comparative Example 4 Binder resin 200 200 200 500 Heat-resistant pigment 250 300 0 100 Heat dissipating pigment 50 0 0 100 General pigment 0 0 300 100 Organic solvent 500 500 500 200 　 1000g 1000g 1000g 1000g

A transparent layer paint containing 400 parts by weight of polyester resin, 150 parts by weight of melamine resin, 410 parts by weight of organic solvent, 10 parts by weight of acid catalyst, and 50 parts by weight of additive was applied on the printed layers formed in Comparative Examples 3 to 4 and Examples 3 to 4, and then heated, cooled, and dried at 200 to 250°C to form each transparent layer having a thickness of 10 μm, thereby preparing specimens of Examples 3 to 4 and specimens of Comparative Examples 3 to 4.

Polyester resin: SKYBON ES110S (manufacturer: SK Chemicals) was used as the binder resin applied to the above printing layer, CARBON BLACK was used as the general pigment, IR BLACK was used as the heat-insulating pigment, R-960 (manufacturer: DUPONT (USA)) was used as the metallic inorganic pigment as the heat-dissipating pigment, cyclohexanone was used as the organic solvent, and additives such as acrylic additives were used.

Thereafter, the physical properties and appearance of the color steel plates of Examples 3 to 4 on which the printed layer and the transparent layer were formed, and the color steel plates of Comparative Examples 3 to 4 on which the printed layer and the transparent layer were formed, were evaluated, respectively, and the results are disclosed in Table 4 below.

Physical properties Example 3 Example 4 Comparative Example 3 Comparative Example 4 Ink transferability Good Good Good Good Adhesiveness Good Good Good error Heat insulation effect Good Good error error TSR value (0.25 or higher is good) 0.314 0.305 0.123 0.150

As can be seen from the results in Table 4, it was confirmed that the TSR values indicating adhesion, heat insulating effect, and heat insulating performance were all excellent in the case of the colored steel plates formed using the paints of Examples 3 and 4.

Claims (15)

A base layer paint printed on a base steel plate including at least one of a fire-treated layer, an anti-corrosion layer and a lower layer, and including 40 to 65 wt% of a binder resin, 3 to 10 wt% of a melamine cured resin, 1 to 35 wt% of a heat-insulating pigment, 1 to 35 wt% of a heat-radiating pigment, 0.5 to 10 wt% of an additive, 0.3 to 3 wt% of an acid catalyst and a remaining organic solvent; and
A paint for PCM color steel plate having heat-insulating and heat-radiating properties, comprising a printed layer paint that is printed on a base layer formed of the above-mentioned base layer paint and contains 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 0.3 to 3 wt% of an additive, and a residual organic solvent. A paint for PCM color steel sheet having heat-insulating and heat-radiating properties, characterized in that in claim 1, the binder resin comprises at least one of polyester resin, polyurethane resin, acrylic resin, silicone-modified polyester resin, alkyd resin, epoxy resin, and fluororesin. A paint for PCM color steel sheet having heat-insulating and heat-dissipating properties, characterized in that in claim 1, the heat-insulating pigment includes a pigment pretreated with a zirconium and aluminum compound, and the heat-radiating pigment includes at least one metallic inorganic pigment selected from the group consisting of titanium oxide, zinc oxide, indium oxide, tin oxide, antimony tin oxide, indium tin oxide, molybdenum oxide, tantalum oxide, vanadium pentoxide, niobium oxide, boron nitronite, and aluminum oxide. A base steel plate comprising at least one of a fire-treated layer, an anti-corrosion layer, and a sub-coat layer;
A base layer formed of a base layer paint containing 40 to 65 wt% of a binder resin, 3 to 10 wt% of a melamine cured resin, 1 to 35 wt% of a heat-insulating pigment, 1 to 35 wt% of a heat-dissipating pigment, 0.5 to 10 wt% of an additive, 0.3 to 3 wt% of an acid catalyst, and a remaining organic solvent;
A printed layer formed on the base layer and comprising a printed layer paint containing 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 1 to 30 wt% of a heat-radiating pigment, 0.3 to 3 wt% of an additive, and a residual organic solvent; and
A PCM color steel sheet having heat-insulating and heat-dissipating properties, comprising a transparent layer formed on the above-mentioned printing layer. delete In claim 4, a PCM color steel sheet having heat-insulating and heat-radiating properties, characterized in that the binder resin includes at least one of a polyester resin, a polyurethane resin, an acrylic resin, a silicone-modified polyester resin, an alkyd resin, an epoxy resin, and a fluorine resin. delete A base steel plate comprising at least one of a fire-treated layer, an anti-corrosion layer, and a sub-coat layer;
A base layer formed of a base layer paint containing 40 to 65 wt% of a binder resin, 3 to 10 wt% of a melamine cured resin, 1 to 35 wt% of a heat-insulating pigment, 1 to 35 wt% of a heat-dissipating pigment, 0.5 to 10 wt% of an additive, 0.3 to 3 wt% of an acid catalyst, and a remaining organic solvent;
A printed layer formed on the base layer and formed with a printed layer paint containing 25 to 70 wt% of a binder resin, 1 to 30 wt% of a heat-insulating pigment, 0.3 to 3 wt% of an additive, and a residual organic solvent; and
A PCM color steel sheet having heat-insulating and heat-dissipating properties, comprising a transparent layer formed on the above-mentioned printing layer. A PCM color steel sheet having heat-insulating and heat-radiating properties, characterized in that in claim 8, the heat-insulating pigment includes a pigment pretreated with a zirconium and aluminum compound, and the heat-radiating pigment includes at least one metallic inorganic pigment selected from the group consisting of titanium oxide, zinc oxide, indium oxide, tin oxide, antimony tin oxide, indium tin oxide, molybdenum oxide, tantalum oxide, vanadium pentoxide, niobium oxide, boron nitronite, and aluminum oxide. A PCM color steel sheet having heat-insulating and heat-radiating properties, characterized in that the TSR (Total Solar Reflectance), which is an indicator of heat-insulating performance, is 0.25 or higher in the fourth clause. A step of preparing a base steel plate including at least one Mars treatment layer, an anti-corrosion layer, and a sub-coat layer;
A step of forming a base layer by coating a base layer paint containing 40 to 65 wt% of a binder resin, 3 to 10 wt% of a melamine cured resin, 1 to 35 wt% of a heat-insulating pigment, 1 to 35 wt% of a heat-dissipating pigment, 0.5 to 10 wt% of an additive, 0.3 to 3 wt% of an acid catalyst, and a remaining organic solvent on a substrate;
A step of forming a printing layer by coating the base layer with a printing layer paint containing 25 to 70 wt% of binder resin, 1 to 30 wt% of heat-insulating pigment, 0.3 to 3 wt% of additives, and a residual organic solvent; and
A method for manufacturing a PCM color steel sheet having heat-insulating and heat-radiating properties, comprising a step of forming a transparent layer on the above printing layer. delete delete A step of preparing a base steel plate including at least one Mars treatment layer, an anti-corrosion layer, and a sub-coat layer;
A step of forming a base layer by coating a base layer paint containing 40 to 65 wt% of a binder resin, 3 to 10 wt% of a melamine cured resin, 1 to 35 wt% of a heat-insulating pigment, 1 to 35 wt% of a heat-dissipating pigment, 0.5 to 10 wt% of an additive, 0.3 to 3 wt% of an acid catalyst, and a remaining organic solvent on a substrate;
A step of forming a printing layer by coating a printing layer paint containing 25 to 70 wt% of binder resin, 1 to 30 wt% of heat-insulating pigment, 1 to 30 wt% of heat-dissipating pigment, 0.3 to 3 wt% of additives, and a residual organic solvent on the base layer; and
A method for manufacturing a PCM color steel sheet having heat-insulating and heat-radiating properties, comprising a step of forming a transparent layer on the above printing layer. A method for manufacturing a PCM color steel sheet having heat-insulating and heat-radiating properties, characterized in that in claim 14, the transparent layer is formed by coating a transparent layer paint containing 40 to 64 wt% of polyester resin, 5 to 25 wt% of melamine cured resin, 0.3 to 3 wt% of acid catalyst, 1 to 10 wt% of gloss-controlling particles, 0.1 to 10 wt% of additives, and a remaining organic solvent.