JPS61209257A - Amino resin molding material - Google Patents

Abstract

PURPOSE:An amino resin molding material having improved insert cracking resistance, obtained by blending an amino resin with a reinforcing material with a filler, a curing agent, a releasing agent, a colorant, etc., to give a mold ing material, and adding further a specific amount of polytutadiene resin to the molding material. CONSTITUTION:(A) An amino resin (one or mixture or modified material of amino acid such as urea resin, melamine resin, guanamine resin, etc.) is blended with a reinforcing material, a fillter, a curing agent, a releasing agent, and a colorant, and further mixed with (B) 3-15wt% based on the total amounts of one, a mixture etc. of polybutadiene resin such as polybutadiene resin, butadiene-styrene copolymer resin, etc., having preferably <=100 meshes particle diameter, to give the aimed molding material.

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to an amino resin molding material used for wiring appliances, air appliances, kitchen appliances, etc.

[Background technology]

Conventionally, amino resin molding materials have excellent arc resistance, tracking resistance, electrical insulation, flame resistance, coloring properties, surface hardness, and solvent resistance, but have excellent static resistance.
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Finally, attempts have been made to improve the heat resistance of the material itself and improve insert crack resistance by adding inorganic fillers to reduce the post-dimensional change rate. There were problems such as increased specific gravity of the material, decreased moldability, and poor insert crack resistance. [Object of the Invention] An object of the present invention is to provide an amino resin molding material having excellent insert crack resistance. [Disclosure of the Invention] The present invention provides an amino resin molding material in which a reinforcing material, a filler, a curing agent, an i-type agent, a coloring agent, etc. are added to an amino resin.
This is an amino resin molding material characterized by the addition of polybutadiene resin, and the addition of polybutadiene resin reduces the bending elasticity of the amino resin, making it possible to greatly improve insert crack resistance. The present invention will now be described in detail. The polybutadiene resin used in the present invention includes polybutadieno resins, butadiene styrene copolymer resins, etc. alone or in mixtures, and preferably has a particle size of 100 mepsicounder to improve dispersibility and resistance to insert cracking and lubricating. This is desirable in order to prevent gender variation. or,
The value of the polybutadiene resin is preferably 3 to 15 weight range (hereinafter simply referred to as ``chi'') based on the total amount. In other words, if the thickness is less than 3, the insert crack resistance tends to decrease;
This is because when it exceeds 54, heat resistance tends to decrease. As the amino resin, amino resins such as urea resin, melamine resin, and guanamine resin can be used alone, as a mixture, or as a modified resin. Regarding reinforcing materials, fillers, curing agents, mold release agents, coloring agents, etc., those used for amino resin molding materials can be used as they are. The method of adding the polybutadiene resin is not particularly limited, and it may be added at the resin impregnation stage of kneading the amino resin and reinforcing material with a kneader or the like, or it may be added at the stage of crushing and coloring with a ball mill or the like. It is. The present invention will be explained below based on examples. Examples 1 to 3 and Conventional Example '$J1 The materials were ground in a ball mill for 6 hours according to the recipe shown in the table, and colored to obtain a melamine resin molding material.The molding material was molded to form a molded product as shown in Figure 1. Obtained. Table 1: 3 Manufactured by Ube Industries, product number: ATBN [Effects of the invention] As is clear from Table 2, the bending elastic modulus and insert crack resistance of the molded products of Examples 1 to 3 and the conventional example are the same as those of the amino acid of the present invention. The performance of the molded product obtained from the resin molding material was good, confirming the superiority of the amino resin molding material of the present invention. Injection As shown in Fig. 1, a mild steel disc 1 was inserted into the test piece 2 at 150°C for 1 hour, then at 20°C, aol
The temperature cycle is repeated for 1 hour at RH, and the number of temperature cycles required for crack generation is measured.
=51φ, rl=60φ, w== 4.5HIt=
= 31n11.

[Brief explanation of drawings]

FIG. 1 is a plan view of a test piece for testing insert crack resistance, and FIG. 2 is a longitudinal sectional view of the same test piece.

Claims (2)

[Claims] (1) Amino resin with reinforcing material, filler, curing agent, mold release agent,
In amino resin molding materials with addition of colorants, etc.
An amino resin molding material characterized by further adding polybutadiene resin. (2) The amino resin molding material according to claim 1, wherein the amount of polybutadiene resin is 3 to 15% by weight based on the total amount.