JP2002045785A - Method for coating resin molded product having hairline pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finish the surface of a product using a brilliant paint containing extremely fine pieces of a metal vapor deposition film so as to form a metallic hairline pattern. SOLUTION: In a method for coating a resin molded product having a hairline pattern, metallic coating having the same system as a metallic coating color is applied to the surface of the resin molded product as undercoating 4 and subsequently, a brilliant synthetic resin film, which is obtained by forming a metal film layer on a base film made of a synthetic resin and further applying a synthetic resin to the metal film layer, or metallic brilliant coating 2 comprising a brilliant paint, which is prepared by grinding the brilliant synthetic resin film from which the base film is peeled to form a powdery or plate-shaped ground matter with 5-50 square μm and mixing the ground matter with an acrylic resin, is applied to the surface of the undercoating layer 4 and, after a drying process, hairline processing 2a is applied to the coating surface and, thereafter, clear coating 5 is applied to the processed surface of the coating surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a metal part of a resin part in which the surface of a product can be finished in a metal tone by using a paint containing ultra-fine pieces of a metal-deposited film. The present invention relates to a method for coating a resin molded product subjected to the above.

[0002]

2. Description of the Related Art Conventionally, in order to form a hairline pattern on the surface of a resin molded product, an in-mold molding method using a transfer foil formed by metal deposition has been used. In this in-mold molding method, since a very fine groove must be formed in the mold in advance, the followability of the transfer foil at the time of molding is limited, so that the degree of freedom of design of the product shape is small and the transfer foil There was a problem that the cost was high.

In such a background, Japanese Patent Laid-Open No. 10-7 / 1998
In Japanese Patent Application Publication No. 1677, a resin molded product having a hairline pattern not depending on a transfer foil is proposed. FIG. 3 is a perspective view of a conventional resin molded product having a hairline pattern. The surface 12 of the resin molded product 11 is a surface having an aluminum luster, and a pattern 15 in which many hair-like streaks flow in one direction. (Hairline pattern) is formed. Therefore, the surface of the resin molded product 11 looks as if it were the surface of a metal component that has been subjected to conventional hairline processing on a metal product. In addition, the above-mentioned resin molded product 1
1 is, as shown in FIG.
The surface of the resin substrate 13 is coated with a metallic coating film 14 as a coating material containing a brilliant material. The resin base material 13 is, for example, AB
It is made of S, PVC, PP, or the like, and has a large number of ultra-fine grooves 15 extending in one direction in the surface thereof. The depth of the ultrafine groove 15 is 10 to 100 μm, and the length of the groove 15 is about 20 to 30 mm.
The metallic coating film 14 is made of a thermosetting acrylic metallic paint (aluminum powder is mixed) used for an overcoat of an automobile body.
Has a thickness that is not completely concealed.

Next, a method of manufacturing the resin molded article 11 will be described. First, injection molding of the synthetic resin of the base material 13 is performed according to a general injection molding process. In order to shape the hairline pattern on the surface of the molded product, the molding die is formed by sandpaper or a metal brush on the surface of which a large number of ultra-fine grooves are elongated and formed in one direction. It is used. Thereafter, although not shown, a thermosetting acrylic metallic paint is applied to the surface of the molded resin base material 13 according to a general process on the ultrafine grooves 15.
Is spray-coated to such a thickness that it is not completely concealed, thereby covering the surface of the resin base material 13 with the metallic coating film 14 as a brilliant material-containing coating film. The thickness of the glittering material-containing coating film is not generally limited, but the thinner the coating film, the more preferable. The brilliant material may be any material that gives a metallic luster to the coating film by emitting a unique or metal-like shine in the coating film, and examples thereof include aluminum powder and titanized mica pigment. The type and composition of the glitter material-containing paint are not particularly limited. For example, a metallic paint used for the top coat of an automobile body, that is, one in which aluminum powder is mixed in a translucent enamel (for example, a thermosetting acrylic paint), or a pearl paint used similarly for the top coat, Those in which the titanized mica pigment is mixed in a translucent enamel are satisfactorily applied.

[0005] The resin molded article 1 thus produced has a surface having an aluminum luster and a pattern in which a number of hair-like streaks flow in one direction. Looks like a metal surface on which is formed, and thus has an excellent performance that is comparable to a conventional hairline processed product made of a metal product and is much lighter than a metal product. In addition, by coating the surface of the metallic coating film 14 with the clear paint, it is possible to finish the resin molded article having the clear coating film as the uppermost layer. The clear coating film is a colorless and transparent coating film made of a clear coating material (a coating material containing no pigment).
It is overlaid and coated on the above-mentioned glittering material-containing coating film. The thickness of the clear coating is generally not limited. Further, as the clear paint, for example, a clear paint used for the uppermost layer of a top coat of an automobile body can be more preferably applied. That is.

[0006]

However, a hairline pattern is formed on the surface of a molded article by the mold having the hairline pattern, and a metallic coating film as a glitter-containing coating film is formed on the surface. A resin molded product having a hairline pattern has the following problems. (1) The thickness of the metallic coating film 4 as the glittering material-containing coating film is such that the microscopic grooves 15 formed by the mold are not completely hidden, that is, the thinner the coating film, the more Since it is preferable, the adhesiveness to the object to be coated is extremely low and the texture of a uniform metallic tone is deteriorated. (2) If there is a gate or a hole on the back of the molded product, the hairline will be displaced due to sinkage, resulting in poor appearance.

[0007]

According to the present invention, a brilliant synthetic resin film is coated on an undercoated metallic painted surface by 5 to 50 μm.
After pulverizing into m-square powder or plate, applying a metallic paint with a glitter paint mixed with acrylic paint, applying a hairline process to this painted surface, and then clear painting on the surface An object of the present invention is to provide a method for coating a resin molded product having a hairline pattern suitable for automobile exterior parts having a very clear hairline pattern and having excellent corrosion resistance and weather resistance.

That is, according to the present invention, a metallic coating of the same type as the metallic coating color is applied as an undercoat 4 on the surface of a resin molded product, and then a metal film is formed on the base film 1a made of synthetic resin. A glitter synthetic resin film 1 formed by forming a layer 1b and coating a synthetic resin on this metal film or laminating a synthetic resin film 1c or a glitter synthetic resin film obtained by peeling a base film from 5 to Pulverize into a 50 μm square powder or plate, apply a metallic paint 2 with a glitter paint obtained by mixing this with an acrylic paint, and after a drying process, apply a hairline process 2 a to the paint surface. And then applying a clear coating 5 on the surface.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The glittering synthetic resin film used in the present invention and an acrylic glittering paint using the same,
As disclosed in Japanese Patent Application Laid-Open No. 11-42464 filed by the present applicant, this glittering synthetic resin film 1 has a thickness of 0.1 to 20.0 μm as shown in FIG. The base film 1a is made of a resin film such as that described above, and a metal such as aluminum or chromium is deposited on the surface of the base film 1a by sputtering or the like.
And an acrylic synthetic resin film 1c
Is coated by printing, a roll coater or the like. Then, the glittering synthetic resin film 1 obtained by peeling the base film 1a is 5 to 50 μm
It is pulverized into square powder or plate.

[0010] The acrylic glitter paint contains 85 to 98% of a commercially available solvent such as toluene or ethyl acetate, 10 to 1% of an acrylic resin, and 1 to 5% by weight of fragments of the glitter synthetic resin film 1. Have been. Note that additives such as a dispersant can be used as necessary.

The material of the molded article is preferably a hard resin such as acrylic, polypropylene, ABS, polycarbonate, modified PPO, or a heat-resistant resin material such as softened acrylic or ionomer resin. do not do.

The hairline processing 2a is formed on a metal-like painted surface by a # 100 to # 1500 sandpaper or a metal brush. The hairline is formed such that a large number of ultrafine grooves are elongated and extend in one direction. Is formed. The depth of the ultrafine groove is set to 1 to 5 μm which is almost equal to the thickness of the glittering coating 2.

The clear coating 5 is a colorless and transparent coating made of a clear coating (a coating containing no pigment), and is coated on the metal-like coating. The thickness of the clear coating is generally not limited. Also, if a benzotriazole-based absorber is used as an ultraviolet absorber in the clear paint, for example, the pigment (aluminum portion) of the paint will be damaged by the ultraviolet rays and rainwater contained in the sunshine and become transparent. Can be prevented and is effective for improving weather resistance.

Next, a method for coating a resin molded product having a hairline pattern according to the present invention will be described. In the present invention, first undercoat coating on the surface of the resin product (the thickness of the coating film is 10 to
20 μm), a metallic paint of the same type as the metallic paint color, that is, one in which aluminum powder is mixed in a transparent acrylic (for example, a two-component curable acrylic urethane paint), or is similarly used for the overcoat. Pearl paint is used. The pigment in the metallic coating must be of the same type as the metallic coating color. For example, in the case of a black or gray metallic coating, the metallic feeling disappears and the appearance unevenness is not preferable.

After the undercoating, after a setting time of 10 to 20 seconds, a metallic coating is performed with the acrylic glitter paint 2 to form a coating film of 1 to 5 μm, and then dried at about 80 ° C. Dry in oven for about 30 minutes.

Next, a hairline pattern is formed with sandpaper or a metal brush, and then a clear coating is applied, followed by drying in a drying oven at about 80 ° C. for about 30 minutes.

[0017]

Next, a test sample was prepared using the method according to the present invention and painted. As shown in FIG.
A base coat (undercoat) 4 having a thickness of 15 to 20 μm was applied to a resin molded product 3 injection-molded with S resin using a metallic paint. Thereafter, a glittering paint obtained by dissolving 3% by weight of the above powdery crushed pieces (15 μm square) having a 0.05 μm aluminum deposition layer in the middle part of an acrylic film and 2% by weight of an acrylic paint, A 0.7 μm coating was performed on the base coat 4. In this state, the powder-shaped or plate-shaped debris (acrylic film) having the aluminum vapor-deposited layer is arranged smoothly on the surface to be coated, and exhibits a uniform metallic luster (metallic feeling). I have.

Next, on the two surfaces of the glitter coating, # 500
Was formed a hairline pattern on the sandpaper. The depth of the ultra-fine grooves of this hairline was 1 to 5 μm, which was almost equal to the film thickness of the glittering coating 2.

Next, clear coating 5 was performed with a clear coating containing a benzotriazole-based absorbent, and then the coated product was dried at a low temperature of 70 to 80 ° C. for 30 minutes.

Table 1 shows a list of evaluation items, judgment criteria and evaluation results of the product of the present invention. Based on Table 1, the above test samples were tested for appearance, hardness of painted surface, paint adhesion, water resistance, spot resistance, volatile oil resistance, wax remover resistance, anti-adhesion, and weather resistance. However, in addition to the various properties, no abnormal appearance was observed.

[0021]

[Table 1]

[0022]

According to the present invention, the metallic paint surface of the same system color as the glitter paint, that is, the undercoat paint surface is painted with a metallic paint with the glitter paint, and then the metal paint surface is subjected to hairline processing. Since the surface is then subjected to a clear coating, the hairline pattern formed by the conventional method is applied to the hairline pattern. By applying the metallic coating of, the feeling of discomfort in the invisible portion when the hairline processing is performed on the metal painted surface is reduced, and a uniform metallic tone can be obtained. Also, a gate on the back of the molded product,
Even if there is a hole, since it is covered with the undercoat, there is no risk that the eyes of the hairline will shift or the appearance will be poor.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing one embodiment of a coated product according to the present invention.

FIG. 2 is a partial longitudinal sectional view of the glittering synthetic resin film of the present invention.

FIG. 3 is a perspective view of a conventional resin molded product having a hairline pattern.

FIG. 4 is an enlarged partial sectional view of FIG. 3;

[Explanation of symbols]

1, 6 brilliant synthetic resin film, 1a base film, 1b metal coating layer,
1c synthetic resin film, 2 brilliant paint,
2a Hairline processing 3 Molded product,
4 Undercoat, 5
Clear painting.

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) // C08L 25:12 C08L 25:12 F term (reference) 4D075 AE03 BB03Y BB24Y CA02 CA06 CA13 CA32 CA38 CA44 CB11 CB13 DB35 DB36 DB37 DB43 DB48 DB55 DC11 EA07 EA43 EB22 EB38 EC23 EC53 4F006 AA22 AB24 AB73 BA01 CA00 DA04

Claims (1)

[Claims] An undercoating (4) is applied to the surface of a resin molded product (3) as a metallic coating of the same type as that of a metallic color, and then a synthetic resin base film (1a) is applied to the surface. And forming a metallic film layer (1b) on the metallic film and coating the metallic film with a synthetic resin or laminating a synthetic resin film (1c) on the glittering synthetic resin film (1) or by peeling the base film. The brilliant synthetic resin film is pulverized into a powder or plate having a size of 5 to 50 μm square, and the resulting mixture is mixed with an acrylic paint to obtain a metallic brilliant paint (2). A hairline process (2a) is applied to the painted surface, and then a clear coating (5) is applied to the surface, thereby coating the resin molded article having a hairline pattern.