JPS62106949A - Production of amino resin molding material - Google Patents

Abstract

PURPOSE:To improve resistance to discoloration by heat and cracking by heat, by blending a solid amino resin with an inorg. fiber, an inorg. powdery filler, stearic acid, a metallic soap, a hardener and a colorant. CONSTITUTION:An inorg. fiber, an inorg. powdery filler, stearic acid, metallic soap, a hardener and a colorant are added to a solid amino resin. The mixture is mixed, kneaded, crushed and optionally granulated. As the solid amino resin, an amino resin alone such as a urea resin, a melamine resin, a guanamine resin, etc., their mixture or their modified resin is used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing an amino resin molding material used in wiring appliances, electrical appliances, kitchen appliances, etc.

[Background technology]

Conventionally, amino resin molding materials have been widely used in stain-resistant electrical appliances, wiring equipment, etc. due to their excellent arc resistance, tracking resistance, electrical insulation, flame resistance, coloring properties, surface hardness, solvent resistance, etc. However, when used as a housing handle of an electric heating device, heat resistance of 130 to 17σC is required, and it is often exposed to temperatures of 200°C. However, with conventional amino resin molding materials for valves and other materials that use only organic fibers as a filler, the amount of filler can be limited to 30 JIi amount % (hereinafter simply referred to as %), and the amount of filler cannot be further increased, so the above-mentioned It did not have the heat resistance to meet the requirements and easily caused heat discoloration and heat cracking.

[Purpose of the invention]

An object of the present invention is to provide a method for producing an amino resin molding material that has excellent resistance to heat discoloration and heat resistance.

[Disclosure of the invention]

The present invention includes solid amino resin, inorganic fibers, inorganic powder filler,
The amount of filler in the molding material is limited because the method for producing amino resin molding material is characterized by adding stearic acid, metal soap, curing agent, and coloring agent, mixing, kneading, crushing, and further granulating if necessary. The present invention will be described in detail below.

The solid amino resin used in the present invention includes solid amino resins such as urea resin, melamine resin, and guanamine resin alone, in mixtures, and in modified form.

The solid amino resin is obtained by reducing the moisture content during spreading to obtain a solid amino resin, and then treating the liquid amino resin with a thin film diffusion device, a vacuum kneader device, etc. to remove moisture. Inorganic fibers include glass fiber, asbestos fiber,
Although any inorganic fiber such as rock wool fiber can be used, it is preferable to use glass fiber, which has stable quality and is easy to improve rigidity. The amount of inorganic fibers is preferably 5-3D% of the total amount. That is, if it is less than 5%, heat resistance tends to decrease, and if it exceeds 5%, it tends to be difficult to increase the amount of inorganic powder filler. Inorganic powder fillers include carbonate, sium, clay, talc,
Silica, aluminum hydroxide, gypsum, finely powdered silicic acid, etc. can be used without any particular limitation. The amount of inorganic powder filler is preferably 10-50% of the total amount. That is, if it is less than 10%, the heat resistance tends to decrease, and if it exceeds ω%, it tends to be difficult to increase the amount of inorganic fiber. As the metal soap, any metal soap such as stearic acid metal soap and lafric acid metal soap can be used, but it is more desirable to use stearic acid metal soap. There are no particular limitations on the mixing, cross-mixing, and pulverizing methods, and preng, kneader-1 extruders, rowers, pulverizers, etc. can be used as they are, but it is preferable to use methods that prevent damage to the inorganic fibers. That's true.

The present invention will be explained below based on examples.

Example 48 parts by weight of solid melamine resin (hereinafter simply referred to as parts): 1.5 parts of 7-μ acid anhydride, 1 part of stearic acid, 1 part of zinc stearate, 6 parts of galanium fiber, 6 parts of gypsum, 15 parts of talc.
1 part and 0.5 part of a coloring agent were added, mixed with pre-mixture, kneaded with a kneader, and then pulverized to obtain a melamine resin molding material.

Comparative Example 1.2 parts of phthalic anhydride, 1 part of zinc stearate, and 1 part of coloring A were added to 100 parts of melamine resin-impregnated pulp with resin f150%, and the mixture was ground in a Bo μ mill and colored to obtain a melamine resin molding material. Ta.

〔Effect of the invention〕

Using the melamine resin molding materials of Example 1 and Comparative Example, a toaster side plate weighing 300 mm was formed into a box shape by direct gate molding, and a practical test was conducted using the molded product at a speed of 90 seconds (f/l/times). As is clear from Table 1, the performance of the molded articles obtained from the molding materials produced by the jEl' method of the present invention was good, confirming the superiority of the method for producing amine resin molding materials of the present invention.

Chapter 1 Table

Claims (1)

[Claims] (1) Add and mix inorganic fibers, inorganic powder filler, stearic acid, metal soap, curing agent, and coloring agent to solid amino resin,
A method for producing an amino resin molding material, which comprises kneading, pulverizing, and further granulating if necessary.