JPH02160079A - Metallic coating film - Google Patents

Abstract

PURPOSE:To improve hiding property and brilliance by successively forming a metallic coating film contg. Al powder, a metallic coating film contg. flaky glass powder and a clear coating film. CONSTITUTION:A first metallic coating film 1 contg. Al powder is formed on the surface of a body 100 to be coated. A second metallic coating film 2 contg. flaky glass powder is formed on the entire surface of the film 1 and coated with clear coating material 3 based on acrylic resin. The pref. content of the glass powder is 0.1-20wt.% and the pref. thickness of the resulting coating film is <=5mum. Unique metallic appearance having superior decorativeness is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a metallic coating film that is applied to automobiles, home products, buildings, etc. and has excellent design effects.

[Prior Art] Traditionally, metallic coatings have been formed on automobiles and the like by utilizing the metallic luster of aluminum powder, giving them unique designs. This metallic coating film generally consists of a base coating film containing aluminum powder and a clear coating film formed on the surface of the base coating film. By adjusting the particle size of the aluminum powder, various brightnesses are obtained, and by blending pigments with excellent transparency, the aluminum powder is used to create various color tones.

Furthermore, in recent years, a material in which the surface of scaly glass powder (hereinafter referred to as glass flake) is plated with metal has been developed, and its application to metallic paints is being considered. This material acts like a mirror and has an excellent shine.

[Problems to be Solved by the Invention] A metallic coating film containing glass flakes having a plating layer as described above has a particularly excellent luster, and has the characteristic of shining brightly even under weak light such as fluorescent light. On the other hand, under strong light such as sunlight, it shines too brightly, which is not desirable in terms of design. Furthermore, since this material has poor hiding properties, it is difficult to disperse it as it is in a transparent paint and use it as a metallic paint. Furthermore, when used together with a pigment having a large hiding power in order to improve the hiding power, there is a problem that the brightness is reduced accordingly.

On the other hand, metallic coatings containing aluminum powder have excellent hiding properties, but have a problem in that they do not provide a glittering effect under weak light such as fluorescent lights.

The present invention solves these contradictory problems, and
The object of the present invention is to provide a novel metallic coating film that is excellent in both shielding properties and glitter properties.

[Means for Solving the Problems] The metallic coating film of the present invention includes a first metallic coating film formed on the surface of the object and containing aluminum powder, and a metallic glitter layer formed on the surface of the first metallic coating film and on the surface. a second metallic coating film containing a scaly glass powder having a second metallic coating;
It consists of a clear coating film formed on the surface of a metallic coating film.

The object to be coated is not particularly limited. It may be formed directly on the material, or when applied to automobiles, the object to be coated is a car body that has been coated with an undercoat and an intermediate coat.

A first metallic coating film is formed on the surface of the object to be coated.

This first metallic coating is similar to a conventional base coating and contains aluminum powder. Other transparent pigments, various additives for paints, etc. may also be contained.

The greatest feature of the present invention is that a second metallic coating film containing glass flakes (hereinafter referred to as glass flake pigment) having a metallic glitter layer is formed on the surface of the first metallic coating film.

Glass flake pigment is the second metallic coating III! 100
It is desirable that the content is 0.1 to 20% by weight. If the content is less than 0.1% by weight, the shine under weak light will be inferior, and if it exceeds 20ffl%, it will shine too strongly in sunlight, which is not desirable in terms of design.

Further, it is desirable that the glass flake pigment has a thickness of 5 μm or less (preferably 1 μm or less) and a particle size of 5 to 200 μm (preferably 10 to 100 μm). If it is larger than this, the smoothness of the surface of the second metallic coating may be impaired.

Furthermore, the thickness of the metallic bright layer on the surface is preferably 100 Å or more, particularly preferably 500 Å or more. If it becomes thinner than this, the brightness will decrease.

To form this metallic bright layer, any of CVD methods such as plating, and PVD methods such as vapor deposition and sputtering can be used. Among these, the electroless plating method is particularly convenient. The material for the metallic luster layer is not particularly limited as long as it has metallic luster, and can be selected from silver, gold, nickel, cobalt, copper, and the like.

The clear coating film is formed on the surface of the second metallic coating film. The second metallic coating film and the first metallic coating film are exposed, and the second metallic coating film is protected and the surface is smoothed to enhance the aesthetic appearance.

The resins constituting the matrix of the first metallic coating film, the second metallic coating film, and the clear coating film may be the same,
It can also be made different. Moreover, the second metallic coating film is the first metallic tJ! It may be formed only on a part of the surface of the i-film. This increases the degree of freedom, such as being able to express characters with the second metallic coating, and allows various designs to be realized.

Next, a method for forming a metallic coating film according to the present invention will be explained.

First, a first metallic paint containing aluminum powder is applied to the surface of the object to be coated. Since this first metallic paint has a high hiding power, the object to be coated is hidden and the color of the first metallic paint itself is exposed.

A second metallic paint containing glass flake pigment is then applied. Here, the first wet state formed
A second metallic coating can also be formed on the surface of the metallic coating by wet-on-wet. However, the application of the second metallic paint disturbs the orientation of the aluminum powder in the first metallic paint film, and the two paints may mix together, making it impossible to obtain the desired metallic feel. Therefore, it is desirable to apply the second metallic paint after the first metallic coating film has dried to some extent.

By adjusting the resin component in the second metallic coating film, for example, t
It is also preferable to use a quick-drying type resin or a resin that is difficult to dissolve in the solvent of the second metallic paint, such as a mixture of iI cellulose resin. Note that if the No. 11 metallic ψ film is completely cured, care must be taken because the adhesion to the second metallic coating may be reduced.

Then, a second metallic coating is applied to a part or all of the first metallic coating film.
Metallic paint is applied. Since this second metallic paint has a low hiding power, the first metallic paint film is exposed through the second metallic paint film.

Then, either wet-on-wet or after the second metallic tIII has dried to some extent, the clear coating film is applied to the surface of the second metallic coating film, and if the first metallic coating film is exposed, the surface of the first metallic coating film is applied. It is also applied.

Next, by drying the clear coating film, the first metallic coating film and the second metallic coating film are also dried, and the metallic coating film of the present invention is formed.

[Operations and Effects of the Invention] In the metallic coating film of the present invention, the first metallic coating film formed on the surface of the object to be coated has a large hiding power, so the surface of the object to be coated is not exposed and has excellent base hiding ability. . Since the second metallic coating film is under the clear coating, the glitter of the glass flake pigment is exposed without being impaired. Furthermore, since the second metallic quasi-film has a low hiding power, the first metallic coating film is exposed through the second metallic coating film, and the metallic feel of the aluminum powder is exposed.

That is, according to the metallic coating film of the present invention, the glittering feeling of both the glass flake pigment and the aluminum powder is obtained under sunlight, and the surface of the object to be coated is hidden. At this time, the strong shine of the glass flakes appears to be softened by the brightness of the aluminum powder, giving it a unique metallic feel with excellent design.

Under weak light such as fluorescent light, the first metallic coating loses its luster, but the second metallic coating shines in a shimmering, lame-like manner and has a unique metallic appearance.

[Example] Hereinafter, this will be explained in detail using examples.

FIG. 1 shows a metallic coating film according to an embodiment of the present invention. The object to be coated 100 has an electrodeposition coating film 101 and an intermediate coating Ill 1
This is an automobile body 103 in which 02 is formed. The metallic coating film of this example includes a first metallic coating 1111 formed on the surface of the object to be coated 100 and a second metallic coating formed on the entire surface of the first metallic coating film 1! l! J2 and the second metallic coating lI! A clear coating film 3 is formed on the entire surface of 2.

(First metallic paint) First, acrylic resin ([Acridic 47-712J
59.5 parts by weight of melamine resin (Super Beckamine L-117J manufactured by Dainippon Ink and Chemicals Co., Ltd.), 25.5 parts by weight of melamine resin (Super Beckamine L-117J manufactured by Dainippon Ink and Chemicals Co., Ltd.), and aluminum powder ([Alpaste 713ONJ (manufactured by Toyo Aluminum Co., Ltd., solid content: 65%) and 15,111 parts to prepare a first metallic paint.

(Second metallic paint) 69.3 parts by weight of acrylic resin ("Acridic 47-712J" manufactured by Dainippon Ink & Chemicals Co., Ltd.) and melamine resin ("Super Beckamin L-117" manufactured by Dainippon Ink & Chemicals Co., Ltd.). ) and 1 part by weight of glass flake pigment were mixed to prepare a second metallic paint. Here, as the glass flake pigment, metal-coated glass flakes (with a thickness of 5 μm or less and an average particle size of 50 μm) are used.
rPs-50-005J Nippon 4 [Niko Co., Ltd.] electrolessly plated with silver at a basis weight of 500 people was used.

(Clear paint) 7011 parts of acrylic resin (7011 parts made by Dainippon Ink & Chemicals Co., Ltd.) and 30 parts of melamine resin (Super Beckamine L-117J made by Dainippon Ink & Chemicals Co., Ltd.) A clear paint was prepared by mixing the following parts.

(Painting) The first metallic paint was diluted with a suitable thinner to a viscosity of 15 seconds (Ford cup #4, 20°C), and applied to the surface of 100 objects to be coated by air spray to a dry film thickness of 15 to 20 μm. . Then, heat it at 120°C for 15 minutes to make the first metallic te semi-hardened! 1i11 was formed.

Next, apply the second metallic paint with a suitable thinner to a viscosity of 15 seconds (
Ford Cup #4 (20℃) and air spray onto the surface of the first metallic coating to a dry film thickness of 10 to 20μ.
It was applied so that the thickness was m. Then, after a 5 minute flash time, the viscosity was 20 seconds (Ford Cup #4, 20℃).
A clear medium diluted in 100% was applied wet-on-wet using air spray so that the dry film thickness was about 30 μm. After setting for 10 minutes, heat at 150℃ for 30 minutes.
Heat for 1 minute, 1st coating 1, 2nd coating 2 and clear coating 3.
were integrally cured.

(Evaluation) The metallic coating film of this example was evaluated for its concealability, designability under sunlight on a clear day, and designability under fluorescent lights at night. As a result, as shown in Table 1, the color tone of the intermediate coating film 102 was not exposed and had excellent hiding properties. In addition, a distinctive radiance can be obtained both under sunlight and fluorescent lights,
It had excellent design.

(Comparative Example 1) The first metallic paint and the second metallic paint used in the example were mixed in a 1:1 ratio by weight, and after coating on the surface of 100 objects to be coated, the same clearness as actual PM84 was obtained by wet-on-wet. Paint was applied. Then, it was dried in the same manner as in the examples to obtain the metallic coating film of Comparative Example 1. In this metallic coating film, aluminum powder and glass flake pigment are present in the lower layer of the clear coating film 3 in a mixed state. This metallic coating film was evaluated in the same manner as in the examples, and the results are shown in Table 1.

(Comparative Example 2) The metallic coating film of Comparative Example 2 has the same structure as the example except that it does not have the first metallic coating film 1. That is, only the glass flake pigment is present in the lower layer of the clear coating film 3, and no aluminum powder is present. This metallic coating film was evaluated in the same manner as in the examples, and the results are shown in Table 1.

(Comparative Example 3) A metallic coating film of Comparative Example 3 was formed in the same manner as in Example except that the acid content of the glass flake pigment in the second metallic coating was 0.05 parts by weight. This metallic coating film was evaluated in the same manner as in the examples, and the results are shown in Table 1.

(Comparative Example 4) A metallic coating film of Comparative Example 4 was formed in the same manner as in Example except that the content of glass flake pigment in the second metallic coating was 30 parts.

This metallic coating film was evaluated in the same manner as in the examples, and the results are shown in Table 1.

From Table 1, the metallic coatings of Comparative Example 1, in which glass flake pigment and aluminum powder were mixed, and Comparative Example 3, in which the absolute coral of the glass flake pigment was lacking, showed no brightness under fluorescent light. In addition, in Comparative Example 2, which does not use the aluminum powder listed in Table 1, the concealing property is poor and the design is too glaring under sunlight, which is not a desirable design. In the metallic coating film No. 4, since there are too many glass flake pigments, although the hiding property is good, it is too shiny under sunlight and is inferior in design.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a metallic coating film according to an embodiment of the present invention. 1...First metallic coating film 2...Second metallic! ! ! Film 3...Clear coating film 100...Coated object Patent applicant: Aisin Kako Co., Ltd. Agent, Patent attorney Hiroshi Okawa

Claims (1)

[Claims] (1) A first metallic coating formed on the surface of the object to be coated and containing aluminum powder, and a second metallic coating formed on the surface of the first metallic coating and containing scaly glass powder having a metallic glitter layer on the surface. a clear coating film formed on the surface of the second metallic coating film;
A metallic coating film.