JPS5924744A - Phenolic molding material and production thereof - Google Patents

Abstract

PURPOSE:To provide the titled material which is useful as asbestos-free materials for clutch and brake and in which a mixture consisting of a melamine- modified phenolic resin, rubber and an org. fiber in equal quantities is in majority and an inorg. filler accounts for a majority of the balance, and to provide a process for producing the titled material. CONSTITUTION:Three components of a melamine-modified phenolic resin, rubber (any rubber compatible with the phenolic resin, such as nitrile rubber, may be used) and an org. fiber (heat-resistant org. fiber such as nylon or polyurethane) are used in equal quantities and account for a majority of the total amount of the titled material. The major part of the balance consists of an inorg. filler such as calcium carbonate. The above raw materials are mixed, kneaded by using a kneader and, if necessary, granulated to produce the titled molding material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a phenolic resin molding material used for clutch materials, brake materials, etc., and a method for producing the same. The purpose of the present invention is to provide a phenolic resin molding material used for clutch materials and brake materials.

Conventional phenolic resin molding materials used in clutch materials and brake materials contain a large amount of aspest, which generates aspest pollution during the entire process of manufacturing, molding, processing, and use of the molding materials. be.

The present invention solves the above-mentioned drawbacks, and is a phenolic resin molding having a composition in which the eight components of melamine-modified phenolic resin, rubber, and organic fiber are equal in amount and account for a majority of the total amount, and the remaining amount is an inorganic filler. Aspest is a molding material obtained by mixing the above materials, kneading it in a kneader, and granulating it if necessary, so it can be used for clutch materials, brake materials, etc. without using Aspest at all. It was possible to eliminate pollution.

The present invention will be explained in detail below. The melamine-modified phenolic resin used in the present invention may be either a resol type or a novolak type, and also includes melamine-modified cresol resin, melamine-modified xylenol resin, and further includes molasses, lignin, xylene, naphthalene, and carbonized petroleum aromatic resins. It also includes melamine-modified phenol resins made from hydrogen resins and the like.

The rubber is not particularly limited as long as it is compatible with the phenol resin, such as nitrile rubber.

Organic fibers include nylon, vinylon, polyester,
There is no particular limitation as long as it is a heat-resistant organic fiber such as polyurethane.

As the inorganic filler, calcium carbonate, silica, magnesium carbonate, clay, etc. can be used, but there are no particular limitations. As compounding materials other than the melamine-modified phenol resin, rubber, organic fibers, and inorganic fillers, commonly used curing agents, mold release agents, coloring agents, etc. can be used as they are. The amounts of the melamine-modified phenol resin, rubber, and organic fiber must be equal, and must account for more than half of the total amount. That is, if the amount of resin is insufficient, the strength will be insufficient, and if the amount is excessive, the abrasion will be increased. Also, if the amount of rubber is insufficient, abrasion will be high, and if it is excessive, the strength will be insufficient. Furthermore, if the amount of organic fiber is insufficient, abrasion will be high, and if it is excessive, strength variations will occur. If the amount of the eight components (resin, rubber, and organic fiber) is less than the majority of the total amount, the abrasion will be high and the strength will be insufficient. In addition, it is necessary that the inorganic filler accounts for the majority of the remaining amount excluding the eight components of resin, rubber, and organic fiber. That is, if the amount of inorganic filler is insufficient, heat resistance and moldability will decrease. In the manufacturing method of the present invention, it is important not to cut, crush, or powderize the organic fibers in the above-mentioned compounded materials.For this reason, roll kneading, extruder kneading, etc., which are conventionally used in the manufacturing process of phenolic resin molding materials, etc. This method is not used to cut the fibers, but rather kneads them with a kneader to form a molding material. At this time, granulation can be carried out using a Henschel mixer or the like, if necessary.

The method of the present invention will be explained below based on examples and conventional examples.

Examples 20 parts by weight of melamine-modified phenol resin (hereinafter simply referred to as parts), 20 parts of nitrile rubber, 20 parts of vinylon fiber, 30 parts of calcium carbonate, 4 parts of hexamine, 2 parts of mold release agent, 2 parts of colorant, dispersion. Two parts of the auxiliary agent were added and kneaded for 30 minutes using a kneader, followed by granulation using a Henschel mixer to obtain a phenolic resin molding material.

Conventional Example Aspestrope was impregnated with a phenolic resin varnish having a resin content of 50% by weight and dried to obtain a rope-like prepreg.

The molding materials and prepregs of the examples and conventional examples were molded for 2 minutes at a molding pressure of 100 kg/cm3 and a molding temperature of 155°C to obtain a disc-shaped clutch material molded product.
As is clear from the table, the molded products obtained from the phenolic resin molding material of the present invention and the method for producing the same at 100°C and 20°C
The wear rate at 0° C. was equivalent to that of a product containing aspest even though it did not contain aspest, confirming the superiority of the phenolic resin molding material of the present invention and its manufacturing method.

Claims (2)

[Claims] (1) A phenolic resin molding material characterized in that eight components, melamine-modified phenolic resin, rubber, and organic fiber, are present in equal amounts and account for a majority of the total amount, and the majority of the remaining amount is an inorganic filler. (2) After mixing the compounding materials in which the eight components of melamine-modified phenolic resin, rubber, and organic fiber are equal in amount and account for a majority of the total amount, and the remaining amount is an inorganic filler, the mixture is kneaded with a kneader and granulated if necessary. A method for producing a phenolic resin, characterized by: