JPS588754A - Amino resin molding material - Google Patents

Abstract

PURPOSE:To provide an amino resin molding material which forms molding products with excellent insert crack resistance and drilling workability, prepared by adding a compatible elastomer to amino resin. CONSTITUTION:An elastomer having compatibility with amino resin, e.g., an acrylic resin, is added to amino resin such as urea or melamine resin together with, if necessary, a hardener, a release agent, a colorant, etc. and the mixture is kneaded, crushed or, if necessary, granulated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an amino resin molding material used for wiring devices, electric appliances, etc., and its purpose is to improve insert crack resistance and drill workability of molded products. be.

Conventionally, styrene rubber,
Although nitrile rubber and the like were added, it was not compatible with the amino resin, causing problems in degassing during molding and in the appearance of the molded product.

The present invention solves the above-mentioned drawbacks by containing an elastic material that is compatible with an amino resin, resulting in excellent C moldability, good insert crack resistance, and IJ molding processability with a good appearance of the molded product. It was possible to obtain an amino resin molding material.

Next, the present invention will be explained in detail. The amino resin used in the present invention may be a urea resin, a melamine resin, a guanamine resin, a phenol-modified melamine resin, etc., and may be in either liquid or solid form. As the elastic body compatible with the amino resin, butyfur, acrylic resin, etc. are preferable, and the elastic body may be either liquid or solid.

Additives other than amino resin and elastomer include curing agents, mold release agents, base materials, which are commonly used as amino resin molding materials.
Fillers, coloring agents, etc. can be used as they are, and the amino resin molding material can be obtained by mixing, kneading, pulverizing, or, if necessary, granulating the materials listed in E.

Hereinafter, the present invention will be explained based on examples.

Example 1 60 parts by weight of a solid melamine resin with residual moisture of 10% (hereinafter simply referred to as %), a part of wood flour, 5 parts of phthalic acid, 5 parts of zinc nateate, and a coloring agent. 1 part of acrylic resin and 0.8 part of acrylic resin were added, mixed, mixed, and crushed to obtain a melamine resin molding material.

Example 2 To 1800 parts of a urea resin initial condensate with a resin content of 60%, 0.8 parts of ammonium chloride, part of sodium hydroxide, part of valve zoo, and 18 parts of petit wort with a molecular weight of 1100 were added, mixed, kneaded, and dried. to obtain a dried product, and the dried product 1
0.00 parts, 0.5 parts of zinc stearate, 0.0 parts of colorant.
5 parts were added, colored with a ball mill, and crushed to obtain an amino resin molding material.

Comparative Example To the same resin content 1 as in Example 2, 0.8 parts of ammonium chloride, 0.1 part of sodium hydroxide, and 260 parts of pulp were added to 1800 parts of a 60% urea resin initial condensate, mixed, mixed, and dried. A dry product was obtained, and 0.6 parts of zinc stearate and 0.6 parts of a coloring agent were added to 100 parts of the dry product, colored with a ball mill, and pulverized to obtain an amino resin molding material.

The amino resin molding materials of Examples 1 and 2 and Comparative Examples were metal insert molded, and the occurrence of cracks around the inserts and the drill workability of the molded products were tested. The results are shown in Table 1. It was confirmed that the insert crack resistance and drill workability of the molded product obtained from the method were excellent, and were superior to those of the present invention.

Chapter 1 Table patent applicant Matsushita Electric Works Co., Ltd. Representative patent attorney9. Bamboo Moto Toshimaru (#1 or 2 people)

Claims (2)

[Claims] (1) An amino resin molding material characterized by containing an elastic body that is compatible with the amino resin. (2) The amino resin molding material according to claim 1, wherein the elastic body is a synthetic resin.