JP2004230234A - Coating film for car - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prepare a coating film for a car, the underlying concealing property of which can be enhanced without thickening the film thickness. <P>SOLUTION: A first base layer 2 containing vapor-deposited aluminum and colored aluminum, a second base layer 3 containing a coloring agent and clear layers 4, 5 are formed on an intermediate coating film 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

考察
表１の結果に示すように、本発明に係る実施例１及び実施例２の何れの塗膜も、塗装外観、彩度、下地隠蔽性、膜厚変動色差及び耐候性の点で問題はなく、特に実施例１の塗膜は塗装外観、彩度、下地隠蔽性及び膜厚変動色差の評価に優れている。
【００３９】
これに対して、比較例１の塗膜は彩度を呈するものが着色マイカしか存在しないので、塗装外観及び彩度の点で問題がある。
【００４０】
比較例２の塗膜は着色アルミニウムの存在で彩度を高めることはできるものの、その他には着色樹脂及び染料しか存在しないので下地隠蔽性及び膜厚変動色差の点で問題があり、また染料が存在するので耐候性もやや劣る。
【００４１】
比較例３の塗膜は着色アルミニウムの存在により彩度を高めることができるが着色樹脂が存在しないので比較例２ほど向上せず、塗装外観、彩度及び膜厚変動色差の点で問題がある。また、染料及び着色マイカが存在するので耐候性もやや劣る。
【図面の簡単な説明】
【図１】本発明に係る自動車用塗膜の実施形態を示す断面図である。
【符号の説明】
１…中塗り塗膜
２…第１ベース層
３…第２ベース層
４…第１クリヤ層
５…第２クリヤ層[0001]
【Technical field】
The present invention relates to a coating film for an automobile used for painting a vehicle body or a bumper, and more particularly to a coating film for an automobile which is preferably applied to a high-color saturation coating color.
[0002]
[Background Art]
A general automobile body coating system is composed of three layers: an undercoat (electrodeposited coat), an intermediate coat, and an overcoat. The top coating film includes a solid coating film containing no glitter pigment such as aluminum or mica, and a metallic coating film containing these glitter pigments, and the latter coating system contains a glitter pigment and a coloring pigment. It consists of two layers, a base coat film and a transparent clear film.
[0003]
In the conventional metallic coating system, the base coat film is coated with a film thickness of 15 μm to 20 μm from the viewpoint of productivity and the like. Was.
[0004]
DISCLOSURE OF THE INVENTION
SUMMARY OF THE INVENTION An object of the present invention is to provide a coating film for automobiles that can enhance the base concealing property without increasing the film thickness.
[0005]
In order to achieve the above object, according to the present invention, there is provided a base coat coating film for automobiles, in which vapor-deposited aluminum is oriented in a planar or layered manner on a lower side and a coloring agent is contained on an upper side. Specifically, there is provided an automotive coating having a first base layer containing evaporated aluminum and a second base layer containing a colorant, wherein the first base layer further contains colored aluminum.
[0006]
In the present invention, the deposited aluminum is oriented in a plane or a layer below the coating film, and this improves the base concealing property. In addition, the color of the coating film will be exhibited by the coloring agent contained on the upper side. Therefore, the underlying layer concealing property can be improved without increasing the film thickness of the coating film, and it can be applied to all coating colors including high chroma coating colors.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing an embodiment of a coating film for automobiles according to the present invention. Hereinafter, the coating method of the present embodiment will be described.
[0008]
An electrodeposition coating and an intermediate coating are applied to a vehicle body made of a steel plate or a resin as a base coating to form an electrodeposition coating and an intermediate coating. 1 (A) to 1 (D) show the intermediate coating film 1 and later. The electrodeposition coating film is formed by applying an electrodeposition coating and baking the same, and the intermediate coating film 1 is formed by spraying an intermediate coating paint on the electrodeposition coating film and then baking the same. Although not particularly limited, the thickness of the electrodeposition coating film is preferably 15 μm to 20 μm, and the thickness of the intermediate coating film is preferably 25 μm to 35 μm.
[0009]
Next, as shown in FIG. 1A, the first base paint constituting the first base layer 2 is sprayed on the surface of the intermediate coating film 1. Although not particularly limited, the thickness of the first base layer 2 is preferably 10 μm to 20 μm.
[0010]
The first base paint contains 4 to 12% of deposited aluminum by pigment weight concentration (hereinafter, also referred to as PWC) and 2 to 10% of colored aluminum by PWC.
[0011]
If the content of the vapor-deposited aluminum is less than 4% by PWC, sufficient undercoat concealing properties are not exhibited, and a base color is developed to give a coating film with low saturation. On the other hand, if the content of evaporated aluminum exceeds 12% in PWC, the adhesion of the coating film decreases.
[0012]
On the other hand, if the content of the colored aluminum is less than 2% in PWC, sufficient saturation cannot be obtained, and if it exceeds 10%, the adhesion of the coating film decreases.
[0013]
The deposited aluminum is aluminum powder obtained by pulverizing a deposited aluminum film, and preferably has an average particle diameter or an equivalent diameter of 10 to 15 μm and a thickness of 0.05 to 0.2 μm. If the average particle diameter or equivalent diameter of the deposited aluminum is less than 10 μm and the thickness is less than 0.05 μm, sufficient underlayer concealing property is not exhibited, and the average particle diameter or equivalent diameter exceeds 15 μm and the thickness is 0.1 μm. If it exceeds 2 μm, spray coating properties will be significantly reduced.
[0014]
The first base layer 2 may contain a coloring agent. For example, coloring agents such as colored mica having an average particle size of 10 to 15 μm and a thickness of 0.3 to 0.5 μm can be used. The colorant contained in the first base layer 2 is preferably 2 to 10% by PWC. When the content of the coloring agent contained in the first base layer 2 is less than 2% by PWC, the base material concealing property is not sufficiently exhibited, and the coating film has low chroma. On the other hand, if the content of the coloring agent exceeds 10% by PWC, the adhesion of the coating film is significantly reduced.
[0015]
Next, as shown in FIG. 2B, the second base paint constituting the second base layer 3 is sprayed on the surface of the first base layer 2 in a wet-on-wet manner. Although not particularly limited, the thickness of the second base layer 3 is preferably 10 μm to 20 μm.
[0016]
The second base paint contains a coloring agent, and examples of the coloring agent contained in the second base layer 3 include colored mica, a colored resin pigment, and a dye.
[0017]
When the second base layer 3 contains colored mica as a coloring agent, it is preferable to use colored mica having an average particle size or equivalent diameter of 5 to 10 μm and a thickness of 0.05 to 0.2 μm. If the average particle diameter or equivalent diameter is less than 5 μm and the thickness is less than 0.05 μm, sufficient underlayer concealment is not exhibited, and the average particle diameter or equivalent diameter exceeds 10 μm and the thickness exceeds 0.2 μm. In addition, the spray coatability is remarkably reduced, and the finish of the coating film is also reduced.
[0018]
The content of the colored mica in the second base layer 3 is preferably 1 to 5% by PWC. If the content of the colored mica is less than 1% by PWC, sufficient saturation cannot be obtained, and if it exceeds 5%, the adhesion of the coating film is significantly reduced.
[0019]
When the second base layer 3 contains a coloring resin as a coloring agent, it is preferable to use a coloring resin having an average particle size of 20 to 150 μm. When the average particle diameter or the equivalent diameter is less than 20 μm, sufficient undercoat concealing property is not exhibited, and when the average particle diameter or the equivalent diameter exceeds 150 μm, the spray coatability is remarkably reduced and the coating film finish is also reduced. .
[0020]
When the second base layer 3 contains a colored resin, the content is preferably 1 to 5% by PWC. If the content of the coloring resin is less than 1% in PWC, sufficient saturation cannot be obtained, and if it exceeds 5%, the adhesion of the coating film is significantly reduced.
[0021]
Incidentally, when the second base layer 3 contains a dye as a coloring agent, the color saturation of the coating film can be further increased as compared with the above-mentioned pigments such as colored mica and colored resin.
[0022]
These colored mica, colored resin and dye as coloring agents contained in the second base layer 3 may be used alone or in any combination.
[0023]
Next, as shown in FIG. 2C, the first clear paint constituting the first clear layer 4 is sprayed on the surface of the second base layer 3 in a wet-on-wet manner. This first clear paint is a transparent paint containing no pigment or dye. Although not particularly limited, the thickness of the first clear layer 4 is preferably 25 μm to 40 μm.
[0024]
Further, as shown in FIG. 4D, the second clear paint constituting the second clear layer 5 is sprayed on the surface of the first clear layer 4 in a wet-on-wet manner. The second clear paint is a transparent paint containing no pigment or dye, and may be the same paint as the first clear paint described above. Although not particularly limited, the thickness of the second clear layer 5 is preferably 30 μm to 45 μm.
[0025]
As described above, when the first base layer 2, the second base layer 3, the first clear layer 4, and the second clear layer 5 are formed on the surface of the intermediate coating film 1 by wet-on-wet, respectively, setting for several minutes (standing still) ) And bake them simultaneously. The baking condition is not particularly limited, but is, for example, 140 ° C. for 20 minutes.
[0026]
In this manner, the automotive coating according to the present embodiment is obtained, and the deposited aluminum is oriented in a plane or a layer on the first base layer 2 in conformity with the automotive coating. The color of the coating film is exhibited by the coloring agent contained in the second base layer 3 while improving the base concealing property. Therefore, the underlying layer concealing property can be improved without increasing the film thickness of the coating film, and it can be applied to all coating colors including high chroma coating colors.
[0027]
The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
[0028]
For example, in the above-described embodiment, the base layer is composed of the two layers of the first base layer 2 containing the vapor-deposited aluminum and the second base layer 3 containing the colorant, but may be composed of one layer. When the base layer is composed of one layer, the deposited aluminum may be oriented in a planar or layered manner below the base layer, and a colorant may be contained above the base layer. In order to form such a coating film layer, for example, paint pipes to be supplied to a coating gun may be provided in two systems, and at the start of coating, a coating material rich in vapor-deposited aluminum may be supplied, and a coating material rich in colorant may be supplied during coating. This is substantially equivalent to shortening the setting time between the first base layer and the second base layer described above.
[0029]
In the above-described embodiment, the first base layer 2 and the second base layer 3 are sprayed wet-on-wet. However, the second base layer 3 may be formed after the first base layer 2 is baked. good. Similarly, although the second base layer 3 and the first clear layer 4 are sprayed wet-on-wet, the first clear layer 4 may be formed after the second base layer 3 is baked. Similarly, the first clear layer 4 and the second clear layer 5 are sprayed wet-on-wet, but the second clear layer 5 may be formed after the first clear layer 4 is baked.
[0030]
Further, in the above-described embodiment, the first clear layer 4 and the second clear layer 5 are formed on the surface of the second base layer 3 from the viewpoint of protection of the coating film. It can also be. Further, the clear layer may be composed of one layer.
[0031]
【Example】
Hereinafter, examples that further embody the present invention will be described.
Example 1
A test piece in which an electrodeposition coating film and an intermediate coating film are formed on a steel sheet is prepared, and a first base coating constituting the first base layer is sprayed on the surface of the intermediate coating film at a thickness of 15 μm, and wet-on-wet. Then, a second base coating material constituting the second base layer was sprayed at a film thickness of 15 μm.
[0032]
The first base coating material used in Example 1 contains 8% of a vapor-deposited aluminum having an average particle diameter of 12 μm and a thickness of 0.1 μm by PWC, and a colored aluminum having an average particle diameter of 12 μm and a thickness of 0.3 μm. 5% by PWC.
[0033]
The second base paint used in Example 1 has a color mica having an average particle diameter of 12 μm and a thickness of 0.1 μm in 8% by PWC, a colored resin having an average particle diameter of 60 μm in 3% by PWC, and a dye. 3% by weight.
[0034]
Further, O-80 clear manufactured by Nippon Paint Co., Ltd. was applied in a wet-on-wet thickness of 35 μm.
[0035]
This was baked at 140 ° C. for 20 minutes. With respect to the obtained coating film, the coating appearance, the chroma, the concealing property of the base, the color difference in the film thickness variation, and the weather resistance were evaluated.
[0036]
Regarding the appearance of the coating, the finish of the coating film was evaluated by visual observation. 良好: good, ○: ordinary, and △: poor. The chroma of the coating film was evaluated by visual inspection. A very high chroma was evaluated as ◎, a high chroma was evaluated as ○, and a normal one was evaluated as Δ. The substrate concealing property was evaluated by the process concealing film thickness. A film having a film thickness required for concealing the substrate of 15 to 20 μm was evaluated as ◎, a film having a film thickness of 20 to 25 μm was evaluated as ○, and a film having a film thickness of 25 μm or more was evaluated as Δ. The film thickness variation color difference was measured with a color difference meter when the film thickness of the first base layer and the second base layer was changed from 9 μm to 21 μm. 、, those with extremely large color differences were rated △. The weather resistance was evaluated by the weather resistance evaluation of the XENOM test, and な い indicates that little discoloration was observed, ○ indicates that there was a color difference but did not reach discoloration, and Δ indicates that the color was clearly changed.
[0037]
Table 1 shows the results of Example 1.
Example 2
The second base paint constituting the second base layer was coated under the same conditions as in Example 1 except that only 8% of a colored mica having an average particle diameter of 12 μm and a thickness of 0.1 μm was contained by PWC as a colorant. Thus, a coating film was obtained. Table 1 shows the evaluation results of Example 2.
Comparative Example 1
Although the first base layer and the second base layer were formed as the base layers in the same manner as in Examples 1 and 2, the first base paint constituting the first base layer does not include any of the vapor-deposited aluminum and the colored aluminum. Except for this, coating was performed under the same conditions as in Example 2 to obtain a coating film. Table 1 shows the evaluation results of Comparative Example 1.
Comparative Example 2
A first base layer and a second base layer were formed as base layers in the same manner as in Examples 1 and 2. However, the first base paint constituting the first base layer did not contain evaporated aluminum, had an average particle size of 12 μm, Only the colored aluminum having a thickness of 0.3 μm contains 5% by PWC. The second base paint constituting the second base layer does not contain colored mica, and contains 3% of a colored resin having an average particle size of 60 μm by PWC and 3% by weight of a dye. Except for this, coating was performed under the same conditions as in Example 1 to obtain a coating film. Table 1 shows the evaluation results of Comparative Example 2.
Comparative Example 3
A first base layer and a second base layer were formed as base layers in the same manner as in Examples 1 and 2. However, the first base paint constituting the first base layer did not contain evaporated aluminum, had an average particle size of 12 μm, Only the colored aluminum having a thickness of 0.3 μm contains 5% by PWC. Further, the second base coating material constituting the second base layer does not contain a coloring resin, and contains 8% of a colored mica having an average particle diameter of 12 μm and a thickness of 0.1 μm by PWC and 3% by weight of a dye. Except for this, coating was performed under the same conditions as in Example 1 to obtain a coating film. Table 1 shows the evaluation results of Comparative Example 2.
[0038]
[Table 1]

DISCUSSION As shown in the results of Table 1, the coating films of Examples 1 and 2 according to the present invention also showed that the coating appearance, chroma, base concealing property, film thickness variation color difference and weather resistance were good. There is no problem in this respect, and the coating film of Example 1 is particularly excellent in the evaluation of the coating appearance, the saturation, the concealing property of the base, and the color difference due to the film thickness variation.
[0039]
On the other hand, since the coating film of Comparative Example 1 exhibits only the color mica which exhibits the saturation, there is a problem in the appearance of the coating and the saturation.
[0040]
Although the coating film of Comparative Example 2 can increase the saturation by the presence of the colored aluminum, since there are only other colored resins and dyes, there is a problem in the base concealing property and the film thickness variation color difference. Since it is present, the weather resistance is slightly inferior.
[0041]
The color of the coating film of Comparative Example 3 can be enhanced by the presence of the colored aluminum, but is not improved as much as that of Comparative Example 2 because there is no colored resin, and there is a problem in terms of the coating appearance, the saturation, and the color difference due to the film thickness variation. . Also, the presence of dyes and colored mica results in slightly poor weather resistance.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of a coating film for an automobile according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Intermediate coating film 2 ... 1st base layer 3 ... 2nd base layer 4 ... 1st clear layer 5 ... 2nd clear layer

Claims (12)

A base coat film for automobiles in which evaporated aluminum is oriented in a planar or layered manner on the lower side and a coloring agent is contained on the upper side. The automotive basecoat coating according to claim 1, comprising a first base layer containing the vapor-deposited aluminum and a second base layer containing the colorant, wherein the first base layer further contains colored aluminum. The base coat coating film for automobiles according to claim 1 or 2, wherein the pigment weight concentration (PWC) of the deposited aluminum is 4 to 12%. The base coat film for automobiles according to any one of claims 1 to 3, wherein the deposited aluminum has an average particle size of 10 to 15 m and a thickness of 0.05 to 0.2 m. The base coat for automobiles according to any one of claims 2 to 4, wherein the pigment weight concentration (PWC) of the colored aluminum is 2 to 10%, the average particle size is 10 to 15 µm, and the thickness is 0.1 to 0.5 µm. Paint film. The automotive base coat coating according to claim 2, wherein the first base layer contains a coloring agent. The colorant contained in the first base layer includes colored mica having a pigment weight concentration (PWC) of 2 to 10%, an average particle diameter of 10 to 15 μm, and a thickness of 0.3 to 0.5 μm. 7. The base coat film for automobile according to 6. The colorant contained in the second base layer contains colored mica having a pigment weight concentration (PWC) of 1 to 5%, an average particle diameter of 5 to 10 µm, and a thickness of 0.05 to 0.2 µm. 8. The base coat coating film for an automobile according to any one of 2 to 7. The automobile according to any one of claims 2 to 7, wherein the colorant contained in the second base layer includes a colored resin pigment having a pigment weight concentration (PWC) of 1 to 5% and an average particle diameter of 20 to 150 µm. Base coat coating for The base coat coating film according to any one of claims 2 to 7, wherein the colorant contained in the second base layer contains a dye. An automotive topcoat having the automotive basecoat coating according to any one of claims 1 to 10 and a clear coating formed on the basecoat coating. The top coat for automobiles according to claim 11, wherein the clear coat is composed of two or more clear layers.

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