JPS5924740A - Phenolic molding material - Google Patents

Abstract

PURPOSE:To improve injection moldability and high-temperature rigidity of moldings, by incorporating ammonium borate in a phenolic molding material. CONSTITUTION:1-19wt% ammonium borate is added to a phenolic molding material. When the amount of ammonium borate is less than 1wt%, the high- temperature rigidity can not be improved, while when the amount exceeds 19wt%, the injection moldability can not be improved. Examples of the phenolic resins are resol and novolak type phenolic resins, cresol resin, xylenol resin and phenolic resins modified with molasses, lignin, xylene, naphthalene or petroleum arom. hydrocarbon resin. As additives other than the phenolic resin and ammonium borate, conventional hardener, parting agent, colorant, filler, reinforcing agent, etc. can be used as such.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding material for obtaining electronic equipment, electrical equipment, automobile parts, ship parts, kitchen goods, miscellaneous goods, etc., and its purpose is to have injection moldability. The object of the present invention is to provide a molding material that provides molded products with excellent rigidity when heated.

Conventional molding materials of this type use high-ortho resins, which have good rigidity when hot, but have the disadvantage of poor injection moldability.Additionally, methods that reduce the elongation of the material during molding improve the rigidity when hot. However, there was a drawback that the molding pressure increased and moldability decreased. Furthermore, in the method of adding a curing aid of salicylic acid, the stiffness when heated was improved, but the moldability was lowered.

The present invention solves the above-mentioned drawbacks, and is capable of improving both hot rigidity and injection moldability by containing 1 to 19% by weight (hereinafter simply referred to as %) of ammonium borate. It is.

The present invention will be explained in detail below. The phenolic resin used in the present invention may be either a resol type or a novolak type, and
It includes cresol resins and xylenol resins, and also includes phenolic resins modified with molasses, lignin, xylene, naphthalene, petroleum-based aromatic hydrocarbon resins, and the like. The amount of ammonium borate added is preferably 1% to 19%, and if it is less than 1%, the stiffness under heat cannot be improved;
%, injection moldability cannot be improved. Additives other than phenol resin and ammonium borate include commonly used curing agents, mold release agents,
Colorants, fillers, reinforcing agents, etc. can be used as they are. A phenol resin molding material is obtained by mixing, kneading, pulverizing, and, if necessary, granulating a blend of these resins, ammonium borate, a curing agent, and the like.

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

Examples 1 and 2 and conventional novolac type phenolic resins were compounded, mixed, kneaded and pulverized according to the formulation table in Table 1 to obtain phenolic resin molding materials.

1 of the phenolic resin molding materials of Examples 1 and 2 and the conventional example
Cylinder stability and warpage of the breaker molded product when injection molding a breaker with a 00 ton injection molding machine at a cylinder rear temperature of 80°C, a cylinder front temperature of 100°C, and a mold temperature of 160°C (the better the rigidity when heated) There is little warping)
As clearly shown in Table 2, it was confirmed that the phenolic resin molding material of the present invention was excellent in injection moldability and thermal rigidity.

Claims (1)

[Claims] A phenolic resin molding material containing 1 to 19% by weight of ammonium borate.