JP2001314813A - Method for forming metallic tone coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problems that the cost is high in an aluminum vapor deposition method and a metallic tone color cannot be obtained as metallic particles appearing on the coated face are scarce and not uniform in a method using a coating material containing a metal, as methods for obtaining a metallic tone color by forming a coating film on a molding and that the metallic particles appearing on the surface are scarce and not uniform so that the metallic tone color cannot be obtained and welds, scratches and the like generated during molding are conspicuous in a method for adding a pigment to a resin molding material itself. SOLUTION: The coating film is thinly formed on the molding using the coating material obtained by adding a metal to a light-transmittable base material and the metallic tone color is obtained by a mixed light composed of a reflected light reflecting the color tone of the molding from the material of the molding and a reflected light reflected from the metal contained in the coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for making a resin molded product (hereinafter referred to as a molded product) look like a metal, and more particularly to a method for forming a metal-like (metallic) coating film on the molded product.

[0002]

2. Description of the Related Art As a method of making a molded product look like a metal, a method of forming various films on the surface of the molded product,
Conventionally, a method of including a metal in a resin itself of a molded article has been performed. These conventional methods will be described with reference to FIGS.

FIG. 2 shows a case where a metal film is formed on the surface of a molded product by using aluminum evaporation. FIG. 2 is a sectional view 5 of the molded product.
0, which means that a multilayer film is formed on the surface of the molded product. In the step of forming these films, an undercoat 52 is first formed to smooth the surface of the molded article 51. Next, an aluminum film 53 is formed on the surface by sputtering or the like. Further, a top coat 54 is formed on the surface to protect the aluminum film. Thus, a three-layer film is formed on the surface of the molded product.

When this molded product is viewed, the color tone looks metallic. The incident light 55a is incident on the top coat 54, and since this top coat is a material through which light can be transmitted, the light is transmitted and reaches the aluminum deposition film 53, where the light is reflected. The reflected light 55b passes through the top coat and is emitted to the outside, and the light is viewed by a person. Because of the light reflected from the aluminum film, the color of the aluminum material is recognized.

Next, a second method will be described with reference to FIG.
FIG. 3 also shows a cross-sectional view 56 of the molded product, 51 is the molded product, 57
Is a coating film formed on the surface of the molded product. This coating film is formed by spray coating. In this method, since the paint itself contains metal, the color tone looks metallic when painted with this paint. This is because the incident light 55a enters the coating film surface, is reflected on the surface of the coating film, and the reflected light 55b is viewed by a person. As described above, since the paint itself has a metallic color, the paint film also looks metallic.

Next, a third method will be described with reference to FIG.
FIG. 4 is a sectional view 58 of the molded product, and 59 is a molded product. Since the resin material used in this molded article contains a metallic pigment which is a material that produces a metallic color, the appearance of the molded article made of the material looks metallic. That is, the incident light 55a is incident on the surface of the molded product, is reflected on the surface, and the reflected light 55b is seen by a person. However, since the resin molding material itself has a metallic color, it looks metallic. Will be.

By such a method, a metallic color is formed on a molded article.

[0008]

However, in the method using aluminum deposition shown in FIG. 2, in addition to many steps,
A large facility such as a vacuum evaporation machine is required, and there is a problem that the facility cost increases and the product cost increases.

In the coating method shown in FIG. 3, there is a restriction on the ratio of metal particles contained in the paint, and when the ratio of metal particles is increased, the fluidity of the paint decreases, so that the paint cannot be used. Therefore, there is a problem that a desired metallic color cannot be obtained.

In the method of mixing a pigment into the resin molding material itself shown in FIG. 4, the ratio of metal particles contained in the resin molding material is limited, and the ratio of metal particles cannot be increased. Therefore, there is a problem that a metallic color cannot be obtained. In addition, there is a problem that welds and scratches generated during molding are conspicuous and cannot be used for products in which appearance is prioritized.

[0011]

According to the present invention, a method for forming a coating film is provided as follows in order to solve such problems.

(1) A coating film is formed on a molded article using a paint containing a metal as a base material through which light passes, and the color tone of the molded article is reflected by reflected light reflected from the material of the molded article and reflected from the metal in the paint. It was obtained by mixing light with reflected light.

(2) In the method for forming a coating film of a molded article according to the item (1), various metallic tones are obtained by controlling the ratio of the two reflected lights.

(3) In the method for coating a molded article as described in (1) or (2) above, as a method for controlling the ratio of the two reflected lights, the thickness of the paint is controlled, or the ratio of the base material and the metal material of the paint is controlled. Either the control or the roughness of the surface of the molded article was controlled.

(4) In the method for coating a molded article according to the above items (1) to (3), a color tone is obtained by coloring a base material of the coating.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view 1 of a molded product used for an interior decoration part (extension) of an automobile lamp. In this figure, 2 is a molded product (resin), and 3 is a coating film.
The paint used for this coating is based on a material through which light can pass, and a fine aluminum powder 4 is mixed with the base material.

This paint is applied to the surface of a molded article by spraying or the like. Then, when the painted surface is painted so that the film thickness of the painted surface becomes thin, when a person looks at the painted surface, both the color of the paint and the material color of the molded product can be seen. As shown in the figure, the incident light 5a first enters the base material,
Go through the base material. This light travels without hitting the aluminum powder material in the base material and reaches the surface of the molded product. Then, the light is reflected on this surface to generate reflected light 5b. This reflected light 5b passes through the base material. The reflected light 5b is also emitted to the outside without hitting the aluminum powder material in the base material, and the light is viewed by a person. Since the reflected light 5b contains the material color of the molded product, the person sees the material color.

In addition to such light, some incident light does not reach the surface of the molded article. Such incident light 6a also enters the coating film surface as shown. This light passes through the base material, but in the process of transmission hits the aluminum powder material and is reflected there. Then, the reflected light 6b passes through the base material and exits to the outside. This reflected light 6b
Contains the material color of aluminum, so when a person sees the light, the person sees the material color of aluminum.

The incident lights 5a and 6a described above are not separately incident on the painted surface but are incident simultaneously, so that when a person looks at the molded product, the material color of the molded product and the material color of aluminum are seen at the same time. Will be. That is, mixed colors are seen. Therefore, by changing the ratio of the reflected light 5b and the reflected light 6b described above, the color tone of the molded article can be changed from a metal tone close to the material color of the molded article to a metal tone close to the aluminum material color.

In FIG. 1, a coating film is placed in a base material.
The aluminum powder particles are arranged in a line, but this is for the purpose of explaining the principle. Actually, aluminum fine particles are randomly contained in the base material.

For this reason, in the reflected light 5b, in addition to the reflected light directly reflected from the surface of the molded article, the reflected light is first reflected by the aluminum particles, and the reflected light reaches the molded article and is reflected there. Includes reflected light that goes out.

Similarly, in the above-mentioned reflected light 6b, in addition to the reflected light directly reflected from the metal particles, the reflected light 6b first reflects on the surface of the molded article, and then reflects on the metal particles and goes out. Includes reflected light.

Depending on which ratio of the reflected light 5b and the reflected light 6b is larger, it is determined whether the color becomes a metallic tone close to an aluminum color or a color close to the material color of a molded product. If the reflected light 5b is large, the color becomes closer to the material color of the molded article, and if the reflected light 6b is large, the color becomes closer to the color of aluminum.

There are various methods for changing this ratio, but the first method is to change the ratio of the aluminum powder material contained in the base material of the paint. If the film thickness formed on the molded article is the same, the one with less aluminum powder material looks closer to the material color of the molded article, and conversely, the more aluminum powder material, the closer to aluminum color.

In the second method, the metallic color can be changed by increasing or decreasing the thickness of the coating film when applying the coating. Increasing the thickness increases the probability that the incident light hits the aluminum particles and reflects it there, increasing the probability of the color appearing closer to the aluminum color. Looks like a close color.

The third method is to change the roughness of the surface of the molded article. If it is a flat surface, that is, a glossy surface,
Among the incident light, the light that reaches the molded product is reflected at an angle, but if there is aluminum particles in the reflected light path, the reflected light is blocked. However, if the surface is rough, the light is irregularly reflected, so that the reflected light is reflected in all directions, and a part of the reflected light is emitted to the outside. Even in this way, the color tone can be changed.

The molded product used by the inventors was black and had a high gloss. The black color of the molded product matched the aluminum material color, and a new metal was obtained. A toned color could be formed.

[0028]

As described above, according to the coating film forming method of the present invention, the conventional coating method using aluminum vapor deposition requires a large aluminum vapor deposition apparatus. No such equipment is required.

In a conventional method of forming a coating film using a coating material containing a metal pigment, the ratio of metal particles contained in the coating material is limited, and the ratio of metal particles appearing on the surface of the coating film is small. In addition, the desired metallic color was not obtained due to the metal particles not being uniformly arranged on the surface, but according to the method of the present invention, not only the metal particles appearing on the surface of the paint, but also the inside of the paint. Since metal particles can also be used effectively, a metallic color can be obtained.

In the method of mixing the pigment into the resin molding material itself, the ratio of the metal particles contained in the resin is limited, so that the ratio of the metal particles appearing on the surface of the molded product is small.
In addition, the desired metallic color could not be obtained because the metal particles were not uniformly arranged on the surface. And
Welds and scratches generated during molding are conspicuous, so that a uniform appearance was not obtained and there were many restrictions on product design.However, according to the method of the present invention, not only metal particles appearing on the surface of the paint, but also metal inside the paint Particles can also be used effectively, resulting in metallic colors. In addition, the desired metallic color can be obtained without welding or scratches generated during molding due to coating.

In the conventional method, a metal film (aluminum film) is formed to form a color. Alternatively, the appearance color is formed by itself such as by forming a coating film. However, in the present invention, since both the material color of the molded product is used in addition to the color of the coating film (metallic color), it can be obtained by itself. A new metallic tone color can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a molded article on which a coating film of the present invention is formed.

FIG. 2 is a cross-sectional view of a molded article on which a conventional aluminum vapor-deposited film is formed.

FIG. 3 is a cross-sectional view of a conventional molded product having a coating film formed of a paint containing a metal.

FIG. 4 is a cross-sectional view of a molded product formed from a resin material including a conventional metal material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sectional view of the molded article of the invention 2 Molded article 3 Paint 4 Metal powder (aluminum) 5a, 6a Incident light 5b, 6b Outgoing light 50 Cross-sectional view of the molded article of the first conventional example 51 Molded article 52 Undercoat 53 Aluminum deposition film 54 Top Coating 55a Incident light 55b Emitted light 56 Cross-sectional view of molded article of second conventional example 57 Metal-containing paint 58 Cross-sectional view of molded article of third conventional example 59 Metal-containing molded article

Claims (4)

[Claims] 1. A coating film is formed on a molded article using a paint containing a metal as a base material through which light is transmitted, and the color tone of the molded article is reflected by the reflected light reflected from the material of the molded article and reflected by the metal contained in the paint. A method for forming a coating film on a molded product, wherein the coating film is formed by light mixed with light. 2. The method for forming a coating film on a molded product according to claim 1, wherein various metallic tones are obtained by controlling the ratio of the two reflected lights. 3. A method of controlling the ratio of the two reflected lights by controlling the film thickness of the paint, controlling the ratio of the base material and the metal material of the paint, or controlling the roughness of the surface of the molded article. 3. The method for forming a coating film on a molded article according to claim 1, wherein the method comprises: 4. The method for forming a coating film on a molded article according to claim 1, wherein a color tone is obtained by coloring a base material of the coating material.