JPS6126659A - Unsaturated polyester resin molding material - Google Patents

Abstract

PURPOSE:The titled molding material obtained by incorporating organic fibers having a specific diameter and glass bends having a specified diameter in specific amounts without causing insufficient filling nor cracking in the inside and outside of molded articles. CONSTITUTION:An unsaturated polyester resin molding material, obtained by incorporating an unsaturated polyester resin with a crosslinking agent, polymerization initiator, thickener and fiber reinforcing agent, etc., and prepared by incorporating and mixing (A) 3-10wt% organic fibers having <=1 denier fiber diameter and preferably 0.5-1mm. fiber length, e.g. vinylon or nylon, with (B) 3-30wt% glass beads having preferably 15-70mu average bead diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses unsaturated polyester V, which allows molded products with a smooth surface without filling defects or cracks to be formed on the outside of the molded product.
This invention relates to resin molding materials.

[Background technology]

Conventionally, methods for improving the filling properties of thick molded products include using thickeners, using vinylon fibers of 1 to 6 denier V, and using high-viscosity polyester resins, but there are limits. However, it has not been possible to completely solve the filling problem of thick-walled molded products.

[Purpose of the invention]

An object of the present invention is to provide an unsaturated polyester V resin molding material that does not cause filling defects or cracks on the outside of a molded product.

[Disclosure of the invention]

In the present invention, additives such as a crosslinking agent, a polymerization initiator, a thickener, a fiber reinforcing agent, an inorganic filler, a mold release agent, a coloring agent, etc. are mixed into an unsaturated polyester resin, and the resulting unsaturated polyester resin is molded. The present invention will be described in detail below with reference to an unsaturated polyester resin molding material which is characterized in that the material contains organic fibers of less than 1 denier and glass pieces.

The crosslinking agent used in the present invention can be a room temperature liquid or solid such as styrene monomer, and is not particularly limited, but diallylphthalate monomer is preferably used to improve heat resistance. In addition, the heat resistance can be improved by blending triallyl isocyanurate in combination with a crosslinking agent to increase the crosslinking density. It is preferable that a medium to high temperature type t-butyl pervenger 41% t can be used.
It is desirable to use butyl octoate, dicumyl liver oxide, etc.A, but other additives such as thickeners, fiber reinforcing agents, inorganic fillers, mold release agents, colorants, etc. are also commonly used. It is also possible to omit or remove part of it if necessary. As organic fibers of less than 1 denier to be used in the invention, vinylon fibers, nylon fibers, Tetron fibers, etc. of less than 1 denier-V can be used, and if the fiber diameter is less than 1 denier-M and diameter, it is particularly limited. It's not a thing. Regarding the fiber length, it is preferable to use a hard fiber with a fiber length of 0.5 to 1 fl in order to further improve the filling property. Furthermore, it is desirable that the amount of fiber is 3 to IO weight (hereinafter referred to as RI) of the total amount.In other words, if the width is less than 3, the filling effect tends to decrease, and +o %, moldability and molded product density tend to decrease.Also, the glass beads used in the present invention are not particularly limited, but preferably have an average particle diameter of 15 to 15%.
It is desirable to use a material with a diameter of 70 microns because it improves filling properties. Furthermore, the number of glass beads is preferably 3 to 304 of the total amount. That is, if the ratio is less than 3, the effect of improving filling properties tends to decrease, and if it exceeds 30, the moldability tends to decrease. Then, a small amount of the above-mentioned additives are added to the unsaturated polyester resin, mixed, mixed, crushed, and optionally granulated to obtain an unsaturated polyester I to obtain a resin molding material. The resulting strained material cannot be molded into a molded product by pressure molding, transfer molding, injection molding, or casting.

The present invention will be explained below using examples.

Examples 1 to 3 and the conventional formulations shown in Table 1 were mixed, kneaded, and pulverized to obtain an unsaturated polyester resin molding material, and the molding material was heated to a molding pressure of aOKq.
/d, and was subjected to direct pressure molding at 150° C. for 3 minutes to obtain a molded product.

[Effects of the Invention] As is clear from Table 2, the appearance of the molded products of Examples 1 to 3 and the conventional example, and the results of cutting the molded products and measuring the filling defects, show that the unsaturated polyester resin molding material of the present invention The performance of the molded article obtained was good, confirming the superiority of the present invention.

Claims (3)

[Claims] (1) Unsaturated polyester resin molding made by blending additives such as crosslinking agents, polymerization initiators, thickeners, fiber reinforcing agents, inorganic fillers, mold release agents, colorants, etc. with unsaturated polyester resins An unsaturated polyester resin molding material characterized by containing organic fibers of less than 1 denier and glass beads. (2) The amount of organic fibers less than 1 denier is 3 to 10 of the total amount.
% by weight. The unsaturated polyester resin molding material according to claim 1. (3) The unsaturated polyester resin molding material according to claim 1, wherein the amount of glass beads is 3 to 30% by weight of the total amount.