JPS58109552A - Phenolic resin molding material - Google Patents

Abstract

PURPOSE:To provide a molding material which gives moldings having excellent heat resistance and toughness without using asbestos, by adding glass fiber having a specified fiber length to a phenolic resin. CONSTITUTION:Glass fiber having a fiber length of 1-10mm. is added to a phenolic resin. When glass fiber having a fiber length shorter than 1mm. is used, moldings having excellent heat resistance and toughness can not be obtd., while when the fiber length exceeds 10mm., the appearance of moldings becomes very poor. Glass fiber is used in an amount of pref. 20-70wt%. When the amount is less than 20wt%, moldings have a tendency to lower heat resistance and toughness, while when the amount exceeds 70wt%, there is a tendency to lower moldability. In addition to the phenolic resin and the glass fiber having a fiber length of 1-10mm., other additives such as hardener, parting agent, colorant, reinforcing agent, etc. may be used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding material for obtaining industrial material parts such as automobile commutators, and its purpose is to provide molding materials with excellent heat resistance and toughness without using asbestos. The objective is to provide molding materials for obtaining products.

Conventional molding materials for heat resistance and 1-toughness use a lot of asbestos, causing asbestos pollution at each stage of the manufacturing process, molding process, and use, which has become a social problem.

The present invention solves the above-mentioned drawbacks, and provides a molding material that allows molded products with heat resistance and toughness to be obtained without using asbestos by adding glass fibers with a fiber length of 1 (1) to 10 Im. It was possible to do so.

The present invention will be explained in detail below. The phenolic resin used in the present invention may be a resol type or a novolak type, or
It also includes cresol resin and xylenol m fat, and also includes molasses, lignin, xylene, naphthalene, modified phenolic resins with petroleum-based aromatic hydrocarbon resins, and the like. Glass fibers include alkali-free glass fibers, alkali-containing glass fibers, etc. Although not particularly limited, it is safe to use fibers with a length of 1"-10M. In other words, fiber lengths of less than 1" have heat resistance and toughness. This is because a molded product cannot be obtained, and if the iom is exceeded, the moldability and appearance of the molded product will be greatly reduced.Furthermore, the amount of glass fiber added is not particularly limited, but is preferably the total amount (4). ~70% by weight
(hereinafter simply referred to as %) is desirable. That is, if it is less than 70g6, the heat resistance and toughness tend to decrease, and if it exceeds 70g6, the moldability tends to decrease. As additives other than the phenol resin and the glass fibers having a fiber length of 1 to 10 mm, curing agents, mold release agents, coloring agents, fillers, and reinforcing agents that are generally used as phenol resin molding materials can be used as they are. When a filler is used in combination, it is desirable to use an inorganic powder filler such as silica, talc, or calcium carbonate. Furthermore, as for the method for manufacturing the phenolic resin molding material of the present invention, conventional manufacturing methods can be applied as is, but in this case, it is preferable to maintain the glass fiber length, and a mixing machine such as a Henschel mixer that does not easily destroy the fiber length is preferably used. It is best to use , these resins, fiber length 1~to
A phenolic resin molding material is obtained by mixing 1EIi galanu fiber, additives, etc., mixing, pulverizing, and granulating if necessary.

Hereinafter, the present invention will be explained based on examples.

Examples 1 and 2 and the conventional example Novolac type phenolic resin with a melting point of 85°C was used.
A phenol fat-resistant molding material was obtained by blending, mixing, and pulverizing according to the recipe shown in the table.

Table 1 % The phenolic resin molding materials of Examples 1 and 2 and the conventional example were molded at a molding pressure of 100V-150°C for 5 minutes to obtain commidator molded products for automobiles.The test results are shown in Table 2. As can be seen, the rotary fracture resistance of the commutator molded product obtained from the phenolic resin molding material of the present invention was good, confirming that the phenol resin molding material of the present invention is superior.

Table 2 Note: Rotate the commutator molded product at 250°C.

patent applicant Matsushita Electric Works Co., Ltd. Representative Patent Attorney Toshimaru Takemoto (2 others) (6)

Claims (2)

[Claims] (1) A phenolic resin molding material characterized by adding glass fibers having a fiber length of 1 to 10 M. (2) The 7-enol resin molding material according to claim 1, characterized in that the amount of glass fiber is 20 to 70% by weight of the total amount.