JPS6111182A - Manufacture of colored resinous molded article having metallic luster - Google Patents

Abstract

PURPOSE:To obtain a metallic luster by coating a transparent paint blended with a pigment having the metallic luster on a colored resinous molded article. CONSTITUTION:A blended paint, obtained by blending a highly transparent paint of urethane and acryl with 0.001-0.3wt%, based on the solid component of the point, aluminum powder having <=10mum mean particle diameter, is coated on the surface of a colored resinous molded article consisting of polyolefin, polyacetal, polycarbonate, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a colored resin molded article having metallic luster.

[Prior art]

Conventionally, the method of manufacturing colored resin molded products is as follows:
There are two methods: one is to add pigments etc. to the resin raw material itself and then mold the entire product, or one is to apply a colored paint to the resin molded product.Also, brightening treatments such as plating or sputtering are also performed.

On the other hand, as a method for obtaining resin molded products with metallic luster,
There are methods such as mixing a metallic pigment into the i-based resin, coating a resin molded product with a metallic paint, or coating the paint with a transparent paint, etc. When a metallic pigment is mixed into a resin raw material, there are disadvantages in that flow patterns are often formed during molding, a large amount of pigment must be used, and the physical properties of the side slopes are brittle.

On the other hand, when applying paint containing metallic pigments, 1
In the case of a coat, the appearance is poor and the durability is poor.Also, if you apply a paint containing metallic pigment and then apply a complete coat of transparent paint, it is necessary to apply two coats, which increases work man-hours and material costs. There are drawbacks. Furthermore, when using paints containing colored metallic luster, it is necessary to use highly concentrated pigments, which not only results in large variations in appearance per color, but also requires preparation of all paints for each color. There is a drawback.

[Structure of the invention]

The non-invention is (1) a method for producing a colored resin molded article with a metallic luster, which is characterized by coating the colored resin molded article with a highly transparent paint containing a small amount of a pigment with a metallic luster. be.

The present inventor conducted various studies in order to eliminate the drawbacks of the above-mentioned prior art, and as a result, the present invention was completed.

In other words, a small amount of pigment with a metallic luster is mixed into a molded product molded using a resin that has been made clear by mixing a colored pigment, etc., to the extent that the color of the molded product itself can be seen from the surface of the coating film. It has been discovered that a colored product with metallic luster can be obtained by coating with a highly transparent paint.

As the pigment to be mixed into the resin raw material for molding a resin molded article, a pigment of a required color may be selected from among commonly used pigments and mixed therein. In addition, to prevent discoloration of resin molded products or deterioration of the resin, light stabilizers are usually mixed in.
In the case of the present invention, since there is no direct influence from wind and rain, humidity, condensed moisture, etc., it is sufficient to mix in a smaller amount than in the case of no coating. Additionally, resin molded products may be textured depending on the desired appearance, and when the surface of the molded product is treated with sandblasting or solvent treatment, a metallic luster surface with different brightness can be obtained. Furthermore, when the paint of the present invention is applied after forming letters in a concavo-convex pattern, the three-dimensional effect is emphasized and the letters can stand out clearly.

In addition, as the resin, in addition to polyolefin, polyacetal, polycarbonate, nylon, etc. can also be used.

The paint used in the present invention may be urethane-based, acrylic-based, etc., as long as it has high transparency, high light resistance, and can follow the flexibility of the resin to be applied, but acrylic-based Paints are preferred.

As the pigment with metallic luster to be mixed into the paint, any aluminum powder having an average particle size of 10 μm or less may be used, and the amount mixed is 0.00 μm based on the solid weight of the paint.
It is preferable to mix within the range of 1 to 0.3% by weight. 0
．． If it is less than 0.001%, sufficient metallic luster cannot be obtained,
Moreover, if it is mixed in at a rate of 0.3% or more, not only the color of the shaped article becomes invisible, but also the durability of the coating film decreases, which is not preferable.

Methods for applying paint to resin molded products include spraying,
Brush coating, dipping, quartering, and other methods may be used, but in order to improve the adhesion of the paint, it is preferable to pre-treat the resin molded product in advance, such as plasma treatment.

Example: Released body made of polyglopyrene (IF-15OA manufactured by Mitsubishi Yuka) (A: 1 color with grain, dark gray.

B: No grain (1 color, cream color) was plasma treated under the following conditions, and then added to R-266 clear paint manufactured by Nippon B Chemical Co., Ltd., with 0.25 weight of Al ξ powder (plate shape: average It was coated to a film thickness of about 35 μm and baked at 90° C. for 40 minutes. For the molded body A, a dark gray product with a grainy appearance and a metallic luster was obtained, and for the molded body B, a cream-colored product with a metallic luster was obtained.

Plasma processing condition equipment: BRANSON IPC 3005-110
203TQA AUTOMATIC PLASMA SY
STICM high frequency: 13.56 MH2, out crab 2
0ON reaction gas 20□ Reaction gas pressure crab in processing chamber 1. OTorr processing time = 3
0 seconds [Effects of the invention] (1) With the same paint, it is possible to obtain a resin molded product with an unprecedented appearance of metallic luster that corresponds to the color of the molded product.

(2) Since there is less pigment mixed into the paint, the adhesion of the paint film is strong (therefore, a paint film with long-term durability can be obtained).

Claims (1)

[Claims] A method for producing a colored resin molded article having a metallic luster, which comprises coating the colored resin molded article with a highly transparent paint containing a small amount of a pigment having a metallic luster.