JP2021006395A - Lacquer-tone coating structure - Google Patents

Abstract

To provide a multi-layer coating structure that has an excellent lacquer-tone texture, and that can maintain the initial high texture of a coating film for a long period of time without reducing the high texture due to small scratches on a surface of the coating film.SOLUTION: There is provided a lacquer-tone coating structure, comprising: a colored base-coating film formed on an object to be coated; and a colored clear-coating film formed on the colored base-coating film. The colored base-coating film contains a main pigment and has a visible light reflectance of 2.5 to 6.0%, and the colored clear-coating film contains a dye and has a visible light absorption rate of 60 to 90%. The colored base-coating film preferably contains a white pigment.SELECTED DRAWING: None

Description

The present invention relates to a coating structure having a lacquer-like texture.

In addition to the purpose of protecting the car body and improving durability, there is an increasing demand for appearance quality such as paint texture in painting the car body of automobiles. In particular, since it is possible to impart a high-quality appearance quality to a film by improving the deep black coating texture, a method for forming a black coating film having excellent jet-blackness is required.

Conventionally, as one of the means for realizing such a deep black coating film, a coating film structure in which a color base layer is formed on an underlayer and a color clear layer is formed on the base layer, and the brightness is high. A coating structure using a black color base layer having a low content and a black color clear layer containing a black dye is known (Patent Document 1). According to this structure, scattering by black pigments and the like contained in the color base layer is suppressed by the black dye contained in the black color clear layer, so that whitishness caused by scattered light is reduced and jet blackness is achieved. Can be improved. However, it cannot always be said that sufficient jet blackness can be obtained by the conventional technique, and in particular, when small scratches occur on the surface of the black color clear layer on the surface layer, diffused reflection occurs due to such small scratches. However, there is a problem that the jet-blackness of the coating film is impaired because the diffusely reflected portion looks whitish.

Patent Document 2 describes, as a method for forming a coating film having jet blackness and a heat-shielding function, a coating film using a heat-shielding paint having a heat-shielding function, a coating film using a black base paint, and a color clear paint containing a black dye. A method of sequentially forming a coating film using a color clear paint and a coating film using a color clear paint is described. According to this method, it is possible to form a coating film having a clear jet-blackness and a heat-shielding effect, but even in such a coating film, small scratches occur on the surface of the black color clear layer on the surface layer. In this case, the diffused reflection portion caused by such a small scratch also looks whitish, and as a result, there is a problem that the jet blackness of the coating film is lowered.

Further, in Japanese Patent Application No. 2018-94801, as a multi-layer coating film having jet blackness, on the first black base coating film, the first clear coating film formed on the first black base coating film, and the first clear coating film. The second black base coating film formed on the second black base coating film, the second black clear coating film formed on the second black base coating film, and the third clear coating film formed on the second clear coating film are included. A multi-layer coating having a layered laminated structure is described, and by using a specific paint capable of imparting a small scratch recovery function to the outermost clear layer (third clear coating), small scratches are made on the surface of the coating. It is described that even if the above occurs, diffused reflection due to this can be prevented, and excellent jet-blackness at the time of forming a black coating film can be maintained for a long period of time. However, similarly, in Patent Document 1 and Patent Document 2, most of the wavelength components of the light that reaches the black base coating film are absorbed by the black base coating film, and the light looks completely black when it deviates from the specular reflection angle even a little. There was a problem that it was not possible to obtain a high-quality texture, such as black lacquer, which gradually appeared black as it deviated from the specular reflection angle.

Japanese Unexamined Patent Publication No. 6-15223 Japanese Unexamined Patent Publication No. 2004-174469

The present invention is a multi-layer coating structure having a lacquer-like high texture, and the high texture is not deteriorated due to small scratches on the surface of the coating film, and the initial high texture of the coating film is high. The purpose is to provide a coating structure that can be maintained for a long period of time.

The lacquer-like coating structure of the present invention includes a color-based coating film formed on an object to be coated and a color clear coating film formed on the color-based coating film, and the color-based coating film contains a main pigment. The visible light reflectance is 2.5 to 6.0%, the color clear coating film contains a dye, and the visible light absorption rate is 60 to 90%.
The color-based coating film preferably contains a white pigment.
The film thickness of the color clear coating film is 50 to 80 μm, and the dye preferably contains a chromium complex-based black dye.

The coating structure of the present invention has an excellent lacquer-like texture, and when carbon black is used as the main pigment of the color-based coating film, a black lacquer-like texture can be imparted to the automobile body. The texture is not deteriorated due to small scratches on the surface of the coating film, and the lacquer-like texture at the initial stage of coating can be maintained for a long period of time.

FIG. 1 (a) is a graph showing the relationship between the angle and the brightness (L value) of the test pieces of Example 1, Comparative Examples 1 to 4, and Reference Example 1, and FIG. 1 (b) is a diagram. It is an enlarged view of the dotted line part in the graph of 1 (a). The angle is an angle from the specular reflection, and is an angle of the difference between the specular reflection direction and the viewing direction. FIG. 2 shows, in one embodiment of the present invention in which the main pigment in the color-based coating film is carbon black and the white pigment is titanium oxide (IV), when light is incident into the coating structure, a part of the incident light is color-based. It is a figure which shows the state which is absorbed by the coating film and the color clear coating film, and the rest is reflected.

Hereinafter, embodiments of the present invention will be described in detail.
The lacquer-like coating structure of the present invention includes a color-based coating film formed on an object to be coated and a color clear coating film formed on the color-based coating film, and the color-based coating film contains a main pigment. The visible light reflectance is 2.5 to 6.0%, the color clear coating film contains a dye, and the visible light absorption rate is 60 to 90%.

[Object to be coated]
The objects to be coated used in the coating structure of the present invention are, for example, various vehicle bodies such as automobiles and motorcycles, electric appliances, and the like. Of these, the automobile body is preferable. Further, with cold-rolled steel sheets, galvanized steel sheets, galvanized steel sheets, stainless steel sheets, tin-plated steel sheets and other steel sheets; metal substrates such as aluminum plates and aluminum alloy plates; and various plastic substrates that form the object to be coated. There may be.
Further, the object to be coated may be a metal surface such as a vehicle body, an electric product, or a metal base material that has been subjected to a surface treatment such as a phosphate treatment, a chromate treatment, or a composite oxide treatment. Good.

[Color base coating film]
The color-based coating film formed on the object to be coated contains a main pigment that serves as a color of the coating structure, that is, an exterior color.
The main pigments include carbon black, acetylene black, lamp black, bone black, graphite, black iron oxide (ferrous tetraoxide), black titanium oxide, copper manganese black, copper chrome black, cobalt black, cyanine black and aniline black. Black pigments; phthalocyanine-based, indanslon-based, indigo-based and other blue pigments; azo-based diketopyrrolopyrrole-based perylene-based perinone-based and red pigments such as iron oxide. Of these, carbon black is preferable in that it gives a high-quality lacquer-like texture to the painted structure.

The content of the main pigment in the color base coating film is usually 1.0 to 4.0% by weight, preferably 1.5 to 3.0% by weight. In particular, when carbon black is used, it is preferable to use a carbon black having a particle size of about 300 to 600 nm.

The visible light reflectance of the color-based coating film is 2.5 to 6.0%, preferably 3.0 to 4.0%. The visible light reflectance of the color-based coating film is very low, for example, 0.2 to 1.5% when only carbon black is used as the main pigment. When the visible light reflectance is low in this way, it looks dark from any angle, and it is difficult to obtain a high-quality feel. Therefore, in order to keep the visible light reflectance within the above range, it is preferable to appropriately add a white pigment in addition to the main pigment. By adding the white pigment, the brightness becomes higher and the color becomes closer to white as compared with the case where only carbon black is used as the main pigment. On the other hand, the lower the brightness, the closer to black. High brightness means high visible light reflectance, and low brightness means low visible light reflectance. In FIG. 2, when the main pigment in the color-based coating film is carbon black and the white pigment is titanium oxide (IV), when light is incident into the coating structure, a part of the incident light is the color-based coating film and the color clear. It shows how it is absorbed by the coating film and the rest is reflected. If the incident angle of light is large, the amount of absorption by the color clear coating film or the color base coating film is increased and the reflection intensity is small, and as the reflection angle is increased, the light gradually appears black. On the other hand, when the incident angle of light is small, the incident light almost passes through the color clear layer and is reflected by titanium oxide (IV) or the like in the color base coating film to appear bright and gray.

The blending ratio of the main pigment and the white pigment in the color base coating film is usually 50 to 200 parts by mass, preferably 75 to 120 parts by mass with respect to 100 parts by mass of the main pigment.
As the white pigment, for example, titanium oxide (IV), zinc oxide and the like are used. Of these, titanium oxide (IV) is preferable, and those having a particle size of about 200 to 300 nm are preferably used.
The color-based paint for forming the color-based coating film is prepared by blending the main pigment and the white pigment, a coating-forming base resin, and if necessary, a pigment, a cross-linking agent, a solvent, and other additive components. ..

As the substrate resin, various resins used as the substrate resin for paints are used. For example, it is at least one selected from acrylic resin, vinyl resin, polyester resin, alkyd resin, urethane resin and the like, and has a hydroxyl group, a carboxyl group, a silicon-containing group, an epoxy group and a blocked functional group. Examples thereof include resins having a good isocyanate group.
When the main pigment is aqueous, for example, a substrate resin having a hydrophilic group such as a carboxyl group, a hydroxyl group, a methylol group, an amino group, a sulfonic acid group, or a polyoxyethylene bond is used, and the hydrophilic group is used. The substrate resin may be made water-soluble or water-dispersible by neutralizing the above to, for example, an alkali salt.

Examples of the cross-linking agent include a melamine resin that reacts with a functional group in the substrate resin, a urea resin, a polyisocyanate compound that may be blocked, a carboxyl group-containing compound, an epoxy group-containing compound, and the like.
Solvents used for diluting color-based paints include aromatic solvents such as toluene, xylene, and "Swazole 1000" (Cosmo Petroleum Co., Ltd., trade name, high boiling petroleum solvent); aliphatic solvents such as mineral spirit. Ethyl acetate, butyl acetate, propyl propionate, butyl propionate, 1-methoxy-2-propyl acetate, 2-ethoxyethyl propionate, 3-methoxybutyl acetate, ethylene glycol ethyl ether acetate, and propylene glycol methyl Ester-based solvents such as ether acetate; ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, and methyl amyl ketone; alcohol-based solvents such as isopropanol, n-butanol, isobutanol, and 2-ethylhexanol can be mentioned.

In addition, various additives such as a viscosity imparting agent, a flow conditioner, a light stabilizer, an ultraviolet absorber, an extender pigment, and a pigment dispersant can be added to the color base paint, if necessary. ..
The color base paint can be applied onto the object to be coated by using a coating means such as an air spray, an airless spray, or an electrostatic coating machine. The film thickness of the color base coating film formed by applying the color base paint after drying is usually 5 to 25 μm, preferably 10 to 20 μm.

[Color clear coating]
The color clear coating film is a layer formed on the color base coating film. An uncured color clear coating film can be formed by applying a color clear paint to the uncured surface of the color base coating film.
As the base resin of the color clear paint, the same base resin as that of the color base paint can be used. That is, for example, it is at least one selected from acrylic resin, vinyl resin, polyester resin, alkyd resin, urethane resin and the like, and as a functional group, a hydroxyl group, a carboxyl group, a silicon-containing group, an epoxy group, or a blocked group. Examples thereof include resins having an isocyanate group which may be present.

Examples of the cross-linking agent include a melamine resin that reacts with a functional group in the base resin, a urea resin, a polyisocyanate compound that may be blocked, a carboxyl group-containing compound, an epoxy group-containing compound, and the like.

When carbon black is used as the main pigment in the color base coating film, a black dye may be added to the color clear coating film in order to enhance the jet blackness of the coating film as long as the transparency of the color clear coating film is not impaired. .. As such a black dye, for example, a metal complex dye such as a chromium complex is used. The chromium complex-based black dye reflects light of a short wavelength to exhibit a blue color, and has good weather resistance. Among the chromium complex dyes, azo dyes are preferable. Commercially available products of such chromium complex dyes include, for example, Orasol Black X51, Orasol Black X53, and Orasol Black X55 (manufactured by BASF, trade name). The amount of the black dye added is usually 0.5 to 7.0 parts by mass, preferably 1.5 to 3.0 parts by mass, based on 100 parts by mass of the total solid content of the substrate resin and the cross-linking agent. If the amount of the black dye added is less than 0.5 parts by mass, a jet-black color may not be obtained. On the other hand, if it exceeds 7.0 parts by mass, it may not be possible to obtain a high-quality texture such as black lacquer, which gradually looks black as it deviates from the specular reflection angle.

As dyes of other colors, aniline dyes, di and triallylmethane dyes, vinylon dyes, rhodamine dyes, acrydin dyes, safranin dyes, oxazine dyes, quinoline dyes, thiazole dyes, and azo dyes. Dyes, azomethine dyes, polymethine or azopolymethine dyes, anthraquinone dyes, quinophthalone dyes, phthalocyanine dyes and the like may be used.

A white pigment such as titanium oxide (IV) may be added to the color clear paint, if necessary, in order to adjust the visible light absorption rate of the painted structure to 60 to 90%. In addition, if necessary, color clear paints are added with ordinary additives such as color pigments, functional pigments, extender pigments, sedimentation inhibitors, coating surface conditioners, and ultraviolet absorbers. You may.

The color clear paint is prepared by dissolving or dispersing each of the above components in a solvent and appropriately adjusting the viscosity of the paint. Then, the color clear paint can be applied on the uncured coated surface of the color base paint by a spray coating method such as air spray or airless spray. At the time of painting, electrostatic application may be performed if necessary. The film thickness of the color clear coating film after the color clear paint is applied and cured is preferably 15 to 50 μm, more preferably 25 to 35 μm.
As the solvent used for diluting the color clear paint, the same solvent as that used for diluting the color base paint is used.
The visible light absorption rate after forming the color clear coating film on the color base coating film is preferably 75 to 85%.

After forming an uncured color clear coating film on the uncured color base coating film, the uncured color base coating film and the color clear coating film are heat-cured at the same time to cure the cured color base coating film. It is possible to form a laminated coating film containing the above-mentioned color clear coating film. The baking time for heat curing is appropriately selected depending on the material of the object to be coated. For example, when the object to be coated is a steel plate, it is usually 100 to 180 ° C, preferably 120 to 160 ° C for 10 to 10. It is 90 minutes, and when the object to be coated is plastic, it is usually 60 to 140 ° C., preferably 90 to 120 ° C. for 10 to 90 minutes.

A known clear layer may be further provided on the color clear coating film. At this time, the surface of the cured color clear coating film may be polished prior to providing the clear layer. By polishing the surface of the cured color clear coating film, diffuse reflection at the interface between the color clear coating film and the known clear layer formed on the color clear coating film can be suppressed, and the coating film structure of the present invention can be used. The texture can be enhanced. Polishing is performed by using sandpaper having a particle size of # 600 to 1500, preferably # 800 to 1000, or by wet polishing such as water polishing.

[Clear layer]
The clear layer has a role of further improving the texture of the coated structure of the present invention. The coating structure may be a three-layer structure in which a clear layer is further provided on the color clear coating film in addition to the color base coating film and the color clear coating film described above.
As the clear paint, a known paint capable of forming a transparent coating film can be used without limitation. For example, a thermosetting resin composed of a substrate resin and a cross-linking agent, an organic solvent, and, if necessary, ultraviolet absorption can be used. Those containing an additive for paint such as an agent are used. Examples of the thermosetting resin include an acrylic resin having a crosslinkable functional group such as a hydroxyl group, a carboxyl group, a silanol group, or an epoxy group, a polyester resin, or the like, and a melamine resin capable of reacting with these crosslinkable functional groups. , Urea resin, polyisocyanate compound, or epoxy resin.

Here, the polyisocyanate compound is a compound having two or more free isocyanate groups in one molecule. Examples of the polyisocyanate compound include aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic aliphatic polyisocyanates, aromatic polyisocyanates, and derivatives of these polyisocyanates. Examples of the polyisocyanate derivative include dimer, trimmer, biuret, allophanate, carbodiimide, uretdione, uretoimine, isocyanurate, oxadiazine trione, and polymethylene polyphenyl polyisocyanate (polymeric MDI (Crude MDI)), which are polyisocyanate compounds. Examples thereof include crude tolylene diisocyanate (crude TDI) and a reaction product of the polyisocyanate compound and a polyol.
These polyisocyanate compounds may be used alone or in combination of two or more. Further, among these polyisocyanate compounds, an aliphatic diisocyanate or a derivative thereof is preferably used from the viewpoint of small scratch recovery and weather resistance.

Among these thermosetting resins, a hydroxyl group-containing acrylic resin and a hydroxyl group-containing polyester resin are preferable, and a hydroxyl group-containing acrylic resin is more preferable.

The clear paint can be applied by using a painting means such as an air spray, an airless spray, or an electrostatic coating machine. The film thickness of the clear layer after the clear paint is applied and dried is usually 20 μm or more, preferably 25 to 50 μm.
The clear layer is obtained by heat-curing the clear paint. The baking temperature and baking time for heat curing can be set according to the heat curing of the color base coating film and the color clear coating film.

The lacquer-like coating structure of the present invention includes a color base coating film formed on an electrodeposited object, a color clear coating film formed on the color base coating film, and a clear coating film on the color clear coating film. It has a laminated structure with layers. The coating structure of the present invention has a high lacquer-like texture, and the initial lacquer-like texture of the coating film can be maintained for a long period of time due to the small scratch recovery property of the clear layer.

In the coating structure of the present invention, an intermediate coating layer is usually used as a lower layer of the color base layer. Specifically, an intermediate coating layer having a visible light reflectance of 2.5 to 6.0%, a base layer having a visible light absorption rate of 60 to 90% on the intermediate coating layer, and a clear layer. Can be structured. In this case, carbon black and titanium oxide (IV) are added as coloring materials to the intermediate coating paint, black dye is added as coloring materials to the color base paint, and the same material as described above is used for the clear layer to form a coating structure. It becomes possible to further reduce.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to the following examples.

[Example 1]
[Preparation of test object]
A thermosetting epoxy resin-based cationic electrodeposition coating composition (trade name "Electron GT-10", manufactured by Kansai Paint Co., Ltd.) is electrodeposited on a cold-rolled steel sheet treated with zinc phosphate to a film thickness of 15 μm. , 170 ° C. for 30 minutes to cure. Next, an intermediate coating composition (trade name "TP-67", manufactured by Kansai Paint Co., Ltd.) was coated on the electrodeposition coating film so as to have a film thickness of 30 μm, and heated at 140 ° C. for 30 minutes to cure. A test object to be coated was prepared.

[Preparation of color-based paint]
Carbon black as a black pigment and titanium oxide (IV) as a white pigment are added to the acrylic resin-based melamine-curable organic solvent-based paint with respect to 100 parts by mass of the solid content of the melamine resin-based organic solvent-based black pigment-containing base paint. They were added so as to be 2.0 and 1.9 parts by mass, respectively, and mixed by stirring to prepare a black color base paint (hereinafter referred to as "black base paint").

[Preparation of color clear paint]
Acrylic resin-based melamine-curable organic solvent clear paint, "Orasol Black X55" (trade name, manufactured by BASF, chromium complex-based black dye) and organic solvent (isomass mixed solvent of methyl ethyl ketone and toluene), "Orasol Black X55" (Product name, manufactured by BASF, chrome complex-based black dye) is 2.5 parts by mass with respect to 100 parts by mass of the solid content of the melamine-curing organic solvent type clear paint, and the obtained paint has a temperature of 20 ° C. Ford Cup No. A color clear paint was prepared by stirring and mixing so that the viscosity according to 4 was 24 seconds.

[Clear paint]
Acrylic resin-based acid-epoxy curable organic solvent A clear paint is mixed with an organic solvent (isomass mixed solvent of methyl ethyl ketone and toluene), and the obtained paint has a Ford Cup No. A clear paint was prepared by stirring and mixing so that the viscosity according to 4 was 24 seconds.

[Making a painted structure]
A black base coating was electrostatically coated on the test object using a rotary atomization type electrostatic coating machine so that the cured film thickness was 15 μm to form a black base coating, which was left to stand for 3 minutes. Next, a color clear coating film is electrostatically coated on the uncured black base coating film using a rotary atomization type electrostatic coating machine so as to have a cured film thickness of 30 μm to form a color clear coating film. Then, after leaving it for 7 minutes, it was heated at 140 ° C. for 30 minutes to cure the black base coating film and the color clear coating film at the same time.
Next, the clear coating film is electrostatically coated on the color clear coating film using a rotary atomization type electrostatic coating machine so as to have a cured film thickness of 25 μm to form a clear coating film, and after being left for 7 minutes. , 140 ° C. for 30 minutes to cure the clear coating film to prepare a test plate.
When the visible light reflectance was measured, as shown in Table 1, the visible light reflectance of the black base coating film was 3.5%, and the visible light absorption rate of the color clear coating film was 80%. ..
The visible light reflectance was measured using a spectrocolorimeter CMS35SP (Murakami Color Technology Research Institute). The visible light absorption rate was calculated by measuring the visible light transmittance using DIRECT READING HAZE METER (Toyo Seiki Kogyo Co., Ltd.) and then subtracting the sum of the reflectance and the transmittance from 100.

[Evaluation of painted structure]
The brightness (L value) of the painted structure was measured using a colorimeter GSP-2 (Murakami Color Technology Research Institute). The angle of incident light was set to 60 °, and the relationship between the angle and brightness (L value) was evaluated from specular reflection.
In Example 1, since titanium (IV) oxide is contained in the black base coating film, the vicinity of the specular reflection light, that is, when the angle from the specular reflection is small (~ 25 °), is from the specular reflection. As the angle increased, the amount of decrease in brightness (L value) decreased. When the angle from specular reflection was large (25 ° ~), the brightness was low. From the above, it was possible to obtain a high-quality texture that has a high jet-blackness and gradually looks black as it deviates from the specular reflection angle like black lacquer.
In addition, when the angle from the normal reflection becomes large, it means that the value on the horizontal axis indicating the angle becomes large in the graph in FIG.

[Comparative Example 1]
In Example 1, the test plate was prepared in the same manner as in Example 1 except that the amount of carbon black and titanium oxide (IV) added in the color base paint and the amount of black dye added in the color clear paint were changed. Made.
As shown in Table 1, the visible light reflectance of the color-based coating film of the test plate was 1.0%, and the visible light absorption rate of the color clear coating film was 50%.

[Comparative Example 2]
In Example 1, the test plate was prepared in the same manner as in Example 1 except that the amount of carbon black and titanium oxide (IV) added in the color base paint and the amount of black dye added in the color clear paint were changed. Made.
As shown in Table 1, the visible light reflectance of the color-based coating film of the test plate was 2.0%, and the visible light absorption rate of the color clear coating film was 80%.
In Comparative Examples 1 and 2, when the angle from specular reflection was small (~ 25 °), the amount of decrease in brightness (L value) was larger as the angle from specular reflection increased, as compared with Example 1. When the angle from specular reflection was large (25 ° ~), the brightness was low. From the above, although it has a high jet-blackness, it is not possible to obtain a high-quality texture that gradually looks black as it deviates from the specular reflection angle like black lacquer.

[Comparative Example 3]
In Example 1, the test plate was prepared in the same manner as in Example 1 except that the amount of carbon black and titanium oxide (IV) added in the color base paint and the amount of black dye added in the color clear paint were changed. Made.
As shown in Table 1, the visible light reflectance of the color-based coating film of the test plate was 3.5%, and the visible light absorption rate of the color clear coating film was 50%.

[Comparative Example 4]
In Example 1, the test plate was prepared in the same manner as in Example 1 except that the amount of carbon black and titanium oxide (IV) added in the color base paint and the amount of black dye added in the color clear paint were changed. Made.
As shown in Table 1, the visible light reflectance of the color-based coating film of the test plate was 8.0%, and the visible light absorption rate of the color clear coating film was 80%.
In Comparative Examples 3 and 4, when the angle from specular reflection was small (~ 25 °), the amount of decrease in brightness (L value) was smaller as compared with Example 1 as the angle from specular reflection increased. When the angle from specular reflection was large (25 ° ~), the brightness was high and did not show high jet blackness.

[Reference Example 1]
A test piece was prepared by applying lacquer to a test object to a thickness of 100 μm.
In Reference Example 1, when the angle from specular reflection was small (~ 25 °), the amount of decrease in brightness (L value) was small as the angle from specular reflection increased. When the angle from specular reflection was large (25 ° ~), the brightness was low and the jet blackness was high.

Claims (3)

A color-based coating film formed on an object to be coated and a color clear coating film formed on the color-based coating film are included.
The color-based coating film contains a main pigment and has a visible light reflectance of 2.5 to 6.0%.
A lacquer-like coating structure characterized in that the color clear coating film contains a dye and has a visible light absorption rate of 60 to 90%. The lacquer-like coating structure according to claim 1, wherein the color-based coating film contains a white pigment. The lacquer-like coating structure according to claim 1 or 2, wherein the color clear coating film has a film thickness of 15 to 50 μm, and the dye contains a chromium complex-based black dye.