JPS5924738A - Production of phenolic molding material - Google Patents

Abstract

PURPOSE:To obtain a phenolic molding material which does not undergo uneven stretching during molding, by mixing blending materials excluding hardener, kneading and crushing the mixtue, adding a hardener to the mixture, and kneading and crushing the resultant mixture. CONSTITUTION:Blending materials excluding hardener are mixed. The mixture is kneaded, crushed and mixed with a hardener. The resultant mixture is kneaded and crushed, and, if necessary, granulated. Examples of phenolic resins are novolak phenolic resin, cresol resin, xylenol resin and phenolic resin modified with molasses, lignin, xylene, naphthalene or petroleum arom, hydrocarbon resin. As blending materials other than the phenolic resin, conventional hardener, parting agent, colorant, reinforcing agent, filler, etc. can be used as such.

Description

Detailed Description of the Invention The present invention relates to a method for manufacturing a molding material for obtaining electronic equipment, electrical equipment, automobile parts, ship parts, kitchen parts, miscellaneous goods, etc., and its purpose is to The purpose of the present invention is to provide a molding material with no variation in material elongation over time.

Conventional phenolic resin molding materials are made by adding all compounding materials such as phenol resin, hardening agent such as hexamine, filler, reinforcing agent, mold release agent, coloring agent, etc., then mixing, kneading, crushing, and granulating as necessary. The more the compounded materials are mixed and kneaded to make them homogeneous, the more the curing reaction of the phenolic resin progresses, so it is unavoidable that variations in the elongation of the material during molding will occur. Was that.

The present invention solves the above-mentioned drawbacks, and consists of adding a curing agent to a mixture obtained by mixing, kneading, and pulverizing the compounded materials excluding the curing agent, and then adding the curing agent to the mixture obtained by mixing, kneading, and pulverizing the mixture again, and granulating it as necessary. Because it is a molding agent, it can be mixed and kneaded until it becomes homogeneous without proceeding with the curing reaction of the phenol resin, making it possible to obtain a molding material with no unevenness in the material's elongation during molding.

The present invention will be explained in detail below. The phenolic resin used for wood invention is a novolak type phenolic resin, which also contains cresol resin and xylenol resin, and also contains molasses, lignin,
It also includes modified phenol resins made from xylene, naphthalene, petroleum-based aromatic hydrocarbon resins, etc. As compounding materials other than the phenol resin, commonly used curing agents, mold release agents, colorants, reinforcing agents, fillers, etc. can be used as they are. Conventional equipment and methods can be used as is for mixing, kneading, pulverizing, and granulating methods.
All that is required is to first mix, cross-mix, and crush the ingredients, excluding a hardening agent such as hexamine, then add the hardening agent, mix, knead, and crush again, and granulate if necessary. It is.

The present invention will be explained below based on embodiments and conventional examples.

Example 41 parts by weight of novolac type phenolic resin with a melting point of 90°C (
40 parts of wood flour, 10 parts of calcium carbonate, 1 part of calcium sedearate, and 1 part of a coloring agent were added to the mixture (hereinafter simply referred to as "parts"), mixed for 30 minutes in a blender, kneaded for 10 minutes with heated rolls, and then ground. To the mixture, 7 parts of hexamine was added and mixed again for 30 minutes using a blender, mixed for 10 minutes using a heating roll, and then pulverized to obtain a phenolic resin molding material.

Conventional Example 1 40 parts of wood, 10 parts of calcium carbonate, 1 part of calcium stearate, 1 part of coloring agent, and 7 parts of hexamine were added to 41 parts of novolac type phenolic resin with a melting point of 90°C, mixed in a blender for 30 minutes, and then mixed with a heating roll. After kneading for 10 minutes, the mixture was pulverized to obtain a phenolic resin molding material.

Conventional Example 2 A phenol resin molding material was obtained in the same manner as in Conventional Example 1, except that the heating roll kneading time in Conventional Example 1 was changed to 20 minutes.

The phenolic resin molding materials of Examples and Conventional Examples 1 and 2 were molded at a molding pressure of 100 g/cm2 at 150°C for 5 minutes to obtain molded products.As is clear from Table 2, the phenolic resin of the present invention was tested. It was confirmed that the phenolic resin molding material of the present invention is superior in that the variation in elongation of the molding material during molding is small and the appearance is good.

Claims (1)

[Claims] A phenolic resin molding material characterized by adding a curing agent to a mixture obtained by mixing, kneading, and pulverizing compounded materials excluding a curing agent, and then mixing, kneading, and pulverizing the mixture again, and subjecting the mixture to agitation as necessary. manufacturing method.