JPS6185464A - Phenolic resin molding material - Google Patents

Abstract

PURPOSE:To obtain a phenolic resin molding material giving a molded article having high strength and excellent surface smoothness, and useful for electrical parts and automobile parts, etc., by compounding flaky glass powder to a phenolic resin. CONSTITUTION:The objective molding material can be prepared by compounding (A) a phenolic resin composed of phenol, cresol, xylenol, etc., or a phenolic resin modified with naphthalene, etc. with (B) flaky glass powder having average thickness of 2-3mu and particle size of 48-100 mesh measured by the Tyler standard sieve in an amount of preferably 20-70wt% based on the whole composition, and (C) arbitrary component such as other filler, curing agent, mold- release agent, colorant, aminosilane surface-treating agent, etc., and kneading, crushing and optionally granulating the mixture. The filler is oriented in layers in the obtained molding material, and the material gives a molded article having improved surface smoothness and flexural modulus and high strength.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to seven mechanical deflector parts, automobile parts, marine parts,
The present invention relates to a phenol resin molding material for obtaining molded products that require high strength and surface smoothness for use in parts for communication gates, etc.

[Background technology]

Conventionally, glass fibers, synthetic resin fibers, and natural fibers have been used as fillers in phenolic resin molding materials that require high strength and surface smoothness, but with emphasis on strength, adding a large amount of fiber gC improves fiber orientation. The difference in surface unevenness is 15% due to the difference in
It is not possible to obtain poor surface smoothness on the order of microns or less, and if emphasis is placed on surface smoothness, a large amount of fiber cannot be added, resulting in a decrease in strength.

[Purpose of the invention]

An object of the present invention is to provide a phenol/L/resin molding material that allows molded products with high strength and excellent surface smoothness to be obtained. Because it is a phenolic resin molding material that contains glass powder, the filler is arranged in layers, which improves surface smoothness, improves the flexural modulus, and achieves high strength. It is. The present invention will be explained in detail below.

The flaky glass powder used in the present invention preferably has an average thickness of 2 to 3 microns and a particle size of finer than 4 meshes and coarser than 100 meshes using a tiller sieve. That is, if the mesh is coarser than the woven mesh, the surface smoothness tends to decrease, while if the mesh is thinner than 00 mesh, the strength tends to decrease. Further, the amount of flaky glass powder is preferably 20% of the total amount.
-70 weight total zero C or less (simply written as %) is desirable. That is, if it is less than m%, the strength tends to decrease.
%, the surface smoothness tends to decrease. Fillers other than flaky glass powder include cotton,
Pulp, wood flour, polyvinyl alcohol/I/fiber, polyamide fiber, polyester/I/fiber, polyurethane fiber,
Fibrous fillers such as glass fibers, asbestos fibers, Rockwoo 7L/m fibers, and inorganic powder fillers such as subacid p-sium, sodium hydroxide, silica, magnesium hydroxide, lipolyte, clay, etc., as needed. It is something that can be added. For pheno-ytBJ fats, pheno-μ resins consisting of pheno-A/types such as phenol, Frazi μ, and xylenol alone or in mixtures, and further modified with naphthalene, molasses, epoxy, etc. that are compatible with phenol. It may also be a pheno-1v resin. As additives other than the flaky glass powder and phenolic resin, commonly used curing agents such as hexamine, molding agents, coloring agents, reinforcing agents, and fillers can be used as they are, and if necessary, aminosilane surface treatment agents can be used. to improve dispersibility, mix,
The mixture is mixed, pulverized, and if necessary, granulated to obtain a phenol/l/← Nicolipid molding material.

The present invention will be explained below using examples.

Examples 1 and 2 and Comparative Examples 1 to 3 A phenol resin molding material was obtained by blending, mixing, mixing, and pulverizing the materials according to the recipe in Table 1, and adding the phenol/I/resin molding material to 300% A molded product was obtained by molding at 165°C for 2 minutes.

Table 1 Notes 1 Flake-like glass powder 2-3 microns thick, 70 mesh 12 Glass fiber 3u fiber length [Effects of the invention] Phenol-resin molding materials of Examples 1 and 2 and Comparative Examples 1-3 As is clear from Table 2, the surface and surface lubricity and flexural modulus of the molded products obtained from the present invention were good, confirming the superiority of the pheno-yv C1 resin molding material of the present invention. .

Table 2

Claims (2)

[Claims] (1) A phenolic resin molding material characterized by containing flaky glass powder. (2) The phenolic resin molding material according to claim 1, characterized in that the amount of flaky glass powder is 20-70% by weight.