JPH01249174A - Structure of coating film of automotive bright color coating - Google Patents

Abstract

PURPOSE:To enable polishing work by interposing a transparent clear paint film between a color base coating film and a bright coating film. CONSTITUTION:A base 11 is coated with coating for a mica-contg. color base coating film 12 in a color base coating stage 16. The resulting color base coating film 12 is coated with coating for a clear coating film 13 by a wet-on-wet system in a clear coating stage 17 and the film 12 and the resulting clear coating film 13 are baked with an oven in a baking stage 18. Polishing work is then carried out and a mica-contg. paint film 14 and a clear coating film 15 are successively formed on the baked film 13 in coating stages 19, 20. In a baking stage 21, the films 14, 15 are baked. The quality of a coated product can be considerably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coating film structure of a bright color coating suitable for use as a top coat applied to an automobile body.

(Prior Art) An example of a coating film structure of a bright color coating used in the conventional top coating of an automobile body is shown in FIG. 5.

This coating film structure consists of a color base coating film 2 containing colored pigments on a base 1, and 1 to 10 mica fine particles as a bright pigment.
A translucent mica base coating film 3 containing approximately 10% of brightness and a transparent clear coating film 4 are laminated, and the interaction between the color base coating film 2 and the mica base coating film 3 creates a color that changes depending on the viewing direction. As shown in FIG. 6, this coating film structure is usually such that a color base coating film 2 is applied on a base 1 in a color base coating step 5, and then baking is performed in a step 6. Color base coating film 2 is baked onto base 1, then mica base coating film 3 is applied on color base coating film 2 in mica base coating process 7, and then wet-on-wet is applied onto the mica base coating film 3 in clear coating process 8. Apply clear coating film 4 according to the method,
Thereafter, the bake is formed through the process of baking the mica base coating 3 and the clear coating 4 onto the color base coating 2 in step 9, and each bake is formed between step 6.9 and the subsequent steps. Polishing is performed to correct the surface of the paint film by removing foreign matter adhering to the surface of the paint film and pinholes generated on the surface of the paint film.

(Problems to be Solved by the Invention) By the way, in the coating film structure of the conventional glitter color coating described above, in order to create a new color tone, fine particles of a glitter pigment such as aluminum or mica are mixed into the color base coating film 2. , the color base coating film 2 is baked after step 6 by polishing to remove foreign matter and pinholes, such as foreign matter 10 protruding from the surface of the color base coating film 2 as shown in FIG. 7(a). If a polishing operation is performed to scrape off the part as shown in FIG. There was a problem in that it was not possible to perform polishing work to remove pinholes.

The present invention provides a coating structure that advantageously solves these problems.

(Means for Solving the Problems) The coating film structure of the bright color paint for automobiles of the present invention includes a color base paint film containing a bright pigment and a colored pigment, a bright paint film containing a bright pigment, and a transparent clear paint film. are sequentially laminated, and a transparent clear coating film is further interposed between the color base coating film and the bright coating film.

(Function) With this structure, the bright pigment contained in the color base is completely covered with the clear coating film, so
The clear coating film is baked so that even if VR polishing is performed to remove foreign objects and pinholes after the process, the bright pigment will not be damaged and the color will not change locally.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment of the coating structure of the bright color coating of the present invention, and this coating structure consists of coating a white coating on a base 11 that has been coated with an undercoat and an intermediate coating on the surface of a vehicle body panel. Alternatively, a color base coating film 12 containing a colored pigment such as yellow and fine mica particles, a transparent clear coating film 13, a translucent mica base coating film 14 containing fine mica particles, and a transparent clear coating film 15 are used. They are layered sequentially.

In forming the above-mentioned coating film structure, as shown in FIG. 2, first, in a color base coating step 16, the paint of the color base coating film 12 is applied onto the base 11, and then after several minutes of setting, In a clear coating process 13, the paint of the clear coating film 13 is applied on the color base coating film 12 by a wet-on-wet method, and then in a baking process 18, the color base coating film 12 is baked in an oven.
Then, the clear coating film 13 is baked.

Through this coating process, the mica fine particles contained in the color base coating film 12 are completely covered with the clear coating film 13. Thereafter, in a correction process not shown here, the color base coating film 12 and the clear coating film 12 are completely covered with the clear coating film 13. A partial polishing operation using sandpaper or the like is performed to remove foreign matter attached to the surface of the foreign matter 13 and pinholes formed on the surface of the coating film, for example, the foreign matter 10 as shown in FIG. 3(a).
A polishing operation is performed to remove the parts protruding from the surface of the clear coating film 13, but even if this polishing operation is performed,
As shown in Figures 1 and 2, the mica fine particles in the area around the foreign object 100 are protected by the clear coating film 13 and are not damaged at all, so that the color of the polished area will not be different from other areas. do not have.

After the above polishing process, here is the mica base coating process 19.
Then, the mica-based coating film 14 is applied onto the baked clear coating film 13, and after several minutes of setting, the mica-based coating film 14 is applied in the clear coating process 20.
A clear coating film 15 is applied thereon by a wet-on-wet method, and then baked in step 21, in which the mica-based coating film 14 and clear coating film 15 are baked in an oven.
Finally, in a finishing step (not shown), the mica base coating film 14 and the clear coating film 15 are modified to remove foreign matter and pinholes on their surfaces.

In other words, the coating structure of this example is formed by a 4-coat, 2-bake process, in which the under color is exposed by the color base coating film 12 and the clear coating film 13, and the under color is exposed by the mica base coating film 14 and the clear coating film 15. , the under color and the under color produce a pearl mica color, and the clear coating film 15 on the surface here gives the gloss of the top coating and increases weather resistance, and the intermediate clear coating film 13 is used for polishing. This prevents the color base 120 from becoming partially different in color tone.

Therefore, with this coating structure, polishing can be performed without partially changing the color tone, which greatly improves the quality of bright color coatings containing bright pigments in the color base coating. can be done.

Furthermore, according to this coating film structure, the intermediate clear coating film 13 can improve the gloss after painting is completed.

FIG. 4 shows another embodiment of the present invention, in which aluminum fine particles are used in place of the mica fine particles of the previous example to produce a metallic color.

That is, here, instead of the mica color base coating film 12, a metallic color base coating film 22 containing a colored pigment and aluminum fine particles is provided, and the mica base coating film 1
4, a structure is provided in which a translucent metallic base coating film 23 containing aluminum fine particles is provided, and this structure is formed by the same coating process as in the previous example.

Such a coating structure can also provide the same effects as in the previous example.

Although the above description has been made based on the illustrated examples, the present invention is not limited to the above examples, and can also be applied to bright color coatings using other bright pigments, such as stainless steel, titanium, glass, etc.

(Effects of the Invention) Thus, according to the coating film structure of the present invention, polishing work can be performed without partially changing the color tone, so that bright color coatings containing bright pigments in the color base coating film can be applied. can significantly improve the quality of

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the coating structure of the bright color coating for automobiles of the present invention, Fig. 2 is a process diagram showing the final coating process for forming the structure of the above embodiment, and Fig. 3 is An explanatory diagram showing the operation of the above embodiment, Fig. 4 is a sectional view showing another embodiment of the present invention, Fig. 5 is a sectional view showing a conventional coating structure, and Fig. 6 is a painting process of the above conventional example. FIG. 7 is an explanatory diagram showing the operation of the above-mentioned conventional example. 12...Mica color base coating film 13, 15...Clear coating film 14...Mica base coating film 22...Metallic color base coating film 23...Metallic base coating film Patent applicant Nissan Motor Co., Ltd. No. 1 Figure ~ I3 Gurya 1 change Figure 2 Figure 3 (a) (b) Q10 Figure 4 = 15 Varya Kurigetsu - 1111-23 Medal base f Tsukihara - 1/3 '7 Rear 41 Katara Figures 5-4 Figure 6 Figure 7 (a) (b)

Claims (1)

[Claims] 1. Color base coating film containing bright pigments and colored pigments (
12, 22) and glitter coatings containing glitter pigments (14, 23)
) and a transparent clear paint film (15) are sequentially laminated to form a bright color coating for automobiles, further comprising a transparent clear paint film between the color base paint film and the bright paint film. A coating film structure for a bright color coating for automobiles, characterized in that (13) is interposed therein.