JPS6110413A - Manufacture of insert molded product - Google Patents

Abstract

PURPOSE:To manufacture the insert molded product excellent in heat resistance and strength by surface treating the insert parts made of brass in a mold with triazine thiol compound. CONSTITUTION:The insert parts 1 made of brass is fixed into a mold, and molten resin is poured into said mold, whereby an insert product is molded. In this product, the surface of the insert parts made of brass is preliminarily surface treated with triazinethiol shown by the formula. The resins such as epoxy, phenyl, or polyester are suitably used for molding material. For the surface treatment of the insert parts made of brass, triazinethiol compound is preliminarily solved in the solvent such as acetone, methylethylketone, and the insert parts is dipped in this solution and then dried, whereby in molding, the deterioration of the resin stuck onto the surface of the insert parts is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for producing insert molded products that require high strength and heat resistance.

Conventional technology -1-,,,,.

Conventionally, insert molded products made by insert molding brass pins, screws, etc. into tape recorder chassis, automobile carburetors, etc. have been widely used. Incidentally, in recent years, insert molding has also been applied to mechanical parts for auto chokes in automobiles and the like, which require high heat resistance and strength.

Problems to be Solved by the Invention However, conventional molded products using brass insert parts have the disadvantage that the resin deteriorates, especially along the surface of the insert part, due to long-term heating, resulting in a decrease in strength.

An object of the present invention is to provide an insert molded product with good heat resistance and strength by preventing thermal deterioration of the resin that occurs on the surface of the insert part.

Means for Solving the Problems The insert molded product of the present invention is an insert molded product in which a brass insert part is fixed in a mold and a molten resin is injected into the mold. is characterized by surface treatment with a triazinethiol compound represented by N. In the above general formula, R is H8-1
0,H,NH-(0,H,)N-, etc.

Effect By treating the surface of the brass insert part with a triazinethiol compound represented by the above general formula, thermal deterioration of the resin along the surface of the insert part is suppressed.

Examples The resins used in the present invention include thermosetting resins such as epoxy resins, phenolic resins, polyester resins, diallyl phthalate resins, melamine resins, and silicone resins, or thermosetting resins such as polyamide resins, acetal resins, polycarbonate resins, and polybutylene terephthalate resins. It is a thermoplastic resin, and can be applied to molding materials made by mixing and kneading reinforcing agents, fillers, additives, and colorants such as glass fiber, asbestos, glass powder, talc, silica, calcium carbonate, and kaolin. .

For surface treatment of brass insert parts, the triazine thiol compound is dissolved in advance in a solvent such as acetone or methyl ethyl ketone, the insert parts are immersed in this solution, and then dried.

Example 1 FIG. 1 is a sectional view of a phenolic resin insert molded product showing an example of the present invention. In this example, a brass insert part 1 is embedded in the center of a resin part 2 of a molded product. Such parts can be applied to parts that require heat resistance and high strength, such as mechanical parts of automobiles. In this example, one brass insert was previously dipped in a solution of 6-sibutylamino-1,3,5-)riazine-2,4-dithiol in 1-thiacetone and dried at room temperature.

Table 1 shows the insert part pullout strength after heat treatment at 200°C for 1000 hours. The strength of insert parts is
This is the strength that allows the insert part of the molded product to be compressed and the insert part to be pulled out.

Comparative Example 1 A molded article was produced in the same manner as in '41 Example 1 above using ordinary brass insert parts without surface treatment.

Table 1 shows the insert part pullout strength after heat treatment at 200°C for 1000 hours.

Table 1 Effects of the Invention As is clear from Table 1, according to the present invention, molded products with excellent heat resistance can be obtained, and even after high-temperature heat treatment, they have a large strong single phase. Also, 1 before heat treatment? However, it has greater strength than conventional materials, and its industrial value is extremely great.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of an insert molded product. 1 is the brass insert part, 2 is the resin part of the molded product

Claims (1)

[Claims] In an insert molded product in which a brass insert part is fixed in a mold and a molten resin is injected into the mold, the brass insert part is formed in advance by a general formula ▲ mathematical formula, chemical formula, A manufacturing method for insert molded products characterized by surface treatment with a triazinethiol compound represented by ▼.