JPS62191075A - Method of coating car body repair - Google Patents

Abstract

PURPOSE:To enhance quality of repair and appearance by spreading color coating on the repairing part and drying, over which ultraviolet rays cured coating is spread and irradiated with ultraviolet rays. CONSTITUTION:In repairing a car body finished with solid base coating, first, urethane racker or the like corresponding to the tone of solid base coating film 3 is spread on the bottom of a repairing part 4 and dried in normal or low temperature to form a color coating film 5. Next, on said color coating film 5, ultraviolet rays cured coating formed basically of acryl, reactive diluting agent, photopolymerization starting agent and micro additive and adjusted to a specified viscosity with dilute solving agent is spread, and for example, by 1-2min irradiation with light of a flourescent lamp 6 of 80-200W, a clear film 7 is formed and the repairing part is finished as hard as the base coating film 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coating method suitable for repairing the exterior coating of vehicle bodies, particularly automobiles.

(Conventional technology) The exterior painting of automobiles is generally done using a high-temperature baking method (approx.
0°C x 20 minutes), but when repairing such repairs, painting must be carried out with interior resin parts etc. attached, so the above-mentioned high temperature baking painting method cannot be applied.

Conventionally, therefore, repair painting has been commonly performed using a lacquer-based paint that can be dried at room temperature or a two-component urethane paint that can be cured by drying at low humidity (80° C.) or by irradiation with an infrared lamp.

(Problem to be solved by the invention) However, the coating film formed using the above-mentioned lacquer-based paint or two-component urethane paint has a lower hardness than the baked-on coating (baked-on coating). For the coating film degree F~H,
The present invention was made to solve the above-mentioned conventional problems, and its purpose is to improve performance and appearance. To provide a repair coating method capable of obtaining a repair coating film that does not have a similar color to that of a non-repaired area (-crotch) in terms of quality.

(Means for Solving the Problem) For this reason, the present invention involves applying a colored paint to the repaired area, drying it at room temperature or low temperature, then applying an ultraviolet curable paint thereon, and irradiating it with ultraviolet rays. It is characterized by the following.

The color paint should be selected from paints that can be dried at room temperature or low temperature, and for example, lacquer thread paint or two-component urethane paint can be used. The method of drying these paints is not particularly limited, but drying using infrared lamp irradiation may also be included.

The ultraviolet curable paint contains 30 to 50 wt% of acrylic resin,
20-40wt% reactive diluent, 1-5w photoinitiator
The basic composition is t% and a small amount of additives, and the viscosity is adjusted to a predetermined value using a diluting solvent.

Pigments can be included in the trace additives, but since pigments inhibit the transmission of ultraviolet rays, it is necessary to limit the amount added.

Although the method of irradiating ultraviolet rays is not particularly limited, a fluorescent lamp can be used. In this case, 80-200W
It is sufficient to use a fluorescent lamp of about 100 liters and irradiate it with the light for about 1 to 2 minutes.

The vehicle body to be repaired can be one that has been finished using Yuzu's paint, such as solid base paint, metallic base paint, mica base paint, etc.

(Function) In the vehicle body repair painting method configured as described above, by applying the colored paint, it becomes possible to adjust the color to match the general area, thereby ensuring the desired appearance quality. Also, by applying UV-curable paint to the surface! R-f! ! It becomes possible to form a coating film with high thickness, overcome the weaknesses of colored paint coatings, and ensure coating performance equivalent to that of general coatings.

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

FIG. 1 shows an example of repair painting on a car body finished with solid base paint. In the figure, reference numeral 1 denotes an outer panel, on which a base treatment film 2 is formed, and further on the base treatment film 2, a solid base paint coating 3 is formed. To paint the repaired area 4 on the car body, first apply urethane lacquer that matches the color Thff1 to the solid base paint coating 3 on the bottom of the repaired area 4, and then 1\ Dry at room temperature to form a colored paint film 5, then apply an ultraviolet curable paint on the colored paint film 5, and irradiate this with light from a fluorescent lamp 6 to form a clear paint film 7. Form.

Here, acrylic resin 4 is used as the above ultraviolet curable paint.
8wt%, reactive diluent 10wt%, photoinitiator 2w
t% and a diluent of 40 wt%, and under the irradiation conditions of the fluorescent lamp 6, irradiation was performed with SOW for 2 minutes. I made it repeat twice.

The light from the fluorescent lamp 6 contains ultraviolet rays, and the ultraviolet curable paint is cured in response to the ultraviolet rays, and has the same hardness as the solid base paint coating 3.

Figure 2 shows an example of repair painting on a car body finished with metallic base paint. In this case, on the base treatment film 2, a metallic paste paint film 8 and a clear paint film 9
However, as in the above embodiment, the repair area 4
Then, a colored paint film 5 made of urethane lacquer and a clear paint film 7 made of ultraviolet curing paint are laminated.

Figure 5 shows an example of repair painting on a car body finished with mica-based paint. In this case, a color paint film 10 is applied to the base treatment film 2, a mica-based paint film 11, and a clear coat. Similarly to the above two embodiments, a colored paint film 5 made of urethane lacquer and a clear film made of ultraviolet curable paint are formed in a laminated manner on the repaired area 4.

In the above three examples, the color paint film 5 was formed under the clear paint film 7 made of ultraviolet curable paint, but the formation of this color paint film was omitted and a small amount of pigment was added. It is also possible to use the UV-curable paint alone for repairs. In this case, the repair efficiency is significantly improved due to the high quick-drying properties.

(Effects of the Invention) As explained above in detail, the present invention applies a colored paint to the repaired area, dries it, then coats it with an ultraviolet curable coating, and cures it by irradiating it with ultraviolet rays. As a result, we not only ensured the appearance quality through color matching, but also ensured performance by improving the hardness of the repair coating, resulting in a significant improvement in the level of repair quality of the vehicle body.

[Brief explanation of drawings]

FIGS. 1 to 6 are schematic diagrams showing an embodiment of the vehicle body repair painting method according to the present invention. 4...Repair area 5...Colored paint film 7...Ultraviolet curable paint film (clear paint film) Patent applicant Toyota Motor Corporation (11 rows up to C) Figure 1

Claims (1)

[Claims] (1) A car body repair painting method characterized by applying a colored paint to the repaired area, drying it at room temperature or low temperature, then applying an ultraviolet curing type paint thereon, and irradiating it with ultraviolet rays.