JPS6342776A - Formation of coated film - Google Patents

Abstract

PURPOSE:To inexpensively and conveniently form a coated film having deepness and an imposing feeling by forming the intermediate coated film with two layers of the lower intermediate coated film in the shade of gray closely resembling that of the topcoated film and the lower intermediate coated film having the hue and shades resembling the topcoated film. CONSTITUTION:A plural-layer coated film consisting of an undercoated film 2, an intermediate coated film, and a topcoated film 5 is formed mainly for the coating of an automobile. In this case, the intermediate coated film is formed with the two layers of the lower intermediate coated film 3 in the shade of gray closely resembling that of the topcoated film and the upper intermediate coated film 4 having the hue and shades resembling the topcoated film. Consequently, a coated film having deepness and an impressive feeling can be formed inexpensively and conveniently.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a coating film forming method which is mainly applied to the coating of automobiles, and more specifically relates to a coating film forming method that is mainly applied to the coating of automobiles. The present invention relates to a method for forming a multi-layer coating film having a deep and profound feeling.

(Prior art) Conventionally, in order to make the scratches less noticeable when a low-opacity topcoat film is formed, an intermediate coat film with a small color difference from the topcoat film is formed under the topcoat film (% Kosho 6l-1t1
No. 189), forming a suitable gray intermediate coating film (
% Kosho 61-101 Shogun) has been said.

(Problem to be Solved by the Invention) Recently, as users have become more luxury-oriented, there has been a demand for coatings that not only have a beautiful appearance, but also have depth and solidity. Conventionally, it has been common practice to apply thin layers of topcoat paint, which is time-consuming and requires expensive weather-resistant pigments for topcoat paints, which increases costs. It is desirable to be able to apply a coating that has a deep and profound feel to it.

An object of the present invention is to provide a coating film forming method that meets such demands.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for forming a multilayer paint film consisting of an undercoat film, an intermediate coat film, and a top coat film. The present invention is characterized in that it is formed into two layers: a lower intermediate coat film having a gray color similar to that of the top coat film, and an upper intermediate coat film having a hue and lightness similar to those of the top coat film.

(Function) The therapy and solid feel of the paint film that cannot be obtained with the top coat film can be obtained with the upper intermediate coat 9 paint film, which has a hue and lightness similar to that of the top coat film.
Furthermore, the lower layer intermediate coat has a gray color similar in brightness to that of the top coat, giving the paint a further layer of therapy.

Furthermore, since gray paints generally contain less pigment and are more fluid than other colored paints, it is difficult to form a smooth lower intermediate coating film, which ultimately improves the smoothness of the entire paint film.

(Example) Referring to Fig. 1, (1) shows an object to be painted such as an automobile body, and after degreasing and chemical conversion treatment, the object (1) is subjected to ordinary electrodeposition coating and baked. By drying, an undercoat film (2) is formed, and then a gray paint with a lightness similar to that of the topcoat film described below is applied and baked to form a lower intermediate coat film (3). A colored paint with a hue and brightness similar to the top coat is applied and baked to dry to form an upper intermediate coat (4).Finally, a top coat (9) is applied and baked to dry to form a top coat. Painting is completed by forming a coating film (5).

Figure 2 shows an example in which the top coat film (5) is formed with metallic paint;
b) is a clear coating film.

Here, the paints used for the intermediate coats (3) and (4) of the lower and upper layers have holes formed on the surface of the paint film due to evaporation of the bath agent during baking drying, causing rough skin on the paint film formed on top of the holes. In order to prevent the occurrence of
A solid polyester paint containing 60 to 80% Y is good.

Experimental example: As the top coat V paint, we used colored paints with high chroma and low heat resistance as shown in the table below, and as the lower layer intermediate coat, we used multiple types of gray paints with different lightness, and as the upper layer intermediate coat V@, we used the top coat paint. Using multiple types of colored paints with the same hue but different brightness, we formed the entire paint film as described above, and visually evaluated the treatment and depth of the completed paint film, and obtained the results shown in the table below. Ta.

In addition, the lightness in hue was expressed in Munsell scale, and the judgment results were as follows: good (○), good (∆), and no effect (×).

From this result, it was found that the difference in brightness between the intermediate coating film and the top coating film of the lower and upper layers should be kept within 1 on the Munsell scale.

In addition, although a paint with lower chroma than the top coat paint was used as the upper intermediate coat paint, the results were good. By forming two layers: a gray lower intermediate coat or paint film, which is responsible for both therapy and therapy, and an upper intermediate coat, which is mainly responsible for therapy and a profound feeling, the smooth coating has a therapeutic and profound feel. The film can be easily obtained, the cost can be reduced compared to the case where the top coat is twisted in a mold, and the productivity can be improved.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a coating film obtained by the method of the present invention, Figure 2
The figure is a schematic diagram when the top coat is a metallic coating. (2)...Undercoat film (3)...Lower intermediate coat film (4)...Upper layer intermediate coat film (5)...Top coat film

Claims (1)

[Scope of Claims] 1. A method for forming a multi-layer paint film consisting of an undercoat film, an intermediate coat film and a top coat film, in which the intermediate coat film is a gray lower layer having a lightness similar to that of the top coat film. An intermediate coating film and an upper intermediate coating film that has a hue and brightness similar to the top coating film.
A coating film forming method characterized by forming a coating film in layers. 2. The method for forming a coating film according to claim 1, wherein the difference in brightness between the lower intermediate coating film, the upper intermediate coating film, and the top coating film is set to ±1 or less in Munsell scale.