JPS5825348A - Amino resin molding material - Google Patents

Abstract

PURPOSE:To provide an amino resin molding material which is useful for electrical equipment and gives moldings having remarkably improved resistance to impact, arc, heat and insert cracking by and dimentional stability, by incorporating glass fiber in an amino resin. CONSTITUTION:Glass fiber, pref,. of alkali-free glass is added to an amino resin, pref. melamine resin, particularly solid melamine resin to obtain the desired molding material. The amount of glass fiber to be added is not critical. Pref. glass fiber is used in an amount of 30-70wt% based on that of the resulting molding material. Other additives such as hardener, parting agent, filler and colorant may be added thereto. This material is kneaded, crushed, and, if necessary, granulated to obtain an amino resin molding material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to amino resin molding materials used for wiring devices, electric appliances, etc., and its purpose is to improve the impact resistance, arc resistance, heat resistance, and resistance of molded products. The objective is to improve insert crackability and dimensional stability.

Conventionally, amino resin molding materials have had valves, wood flour, etc. added as reinforcing materials, resulting in poor impact resistance, arc resistance, heat resistance, insert crack resistance, and dimensional stability. Higher performance and precision of wiring equipment and electrical equipment,
It had the disadvantage of not being able to keep up with the trend of micronization.

The present invention solves the above-mentioned drawbacks, and by incorporating glass fiber, the present invention improves impact resistance, arc resistance, and resistance. It was possible to obtain an amino resin molding material with significantly improved properties, heat resistance, insert crack resistance, and dimensional stability.

Next, the present invention will be explained in detail. Invention 1 “Ami used/
IjlWti Amino resins in general such as urea resin, melamine resin, guanamine resin, and phenol-modified melamine resin may be used in either liquid or solid form, although there is no particular limitation, preferably melamine resin, especially solid melamine resin, is used. Preferably colored. That is, this is because impact resistance, arc resistance, and heat resistance tend to be even better.

Although the glass fiber is not particularly limited, it is preferable to use alkali-free glass. That is, this is because electrical performance tends to be improved. The amount of glass fiber is particularly limited: it is preferably 30 to 7 of the total.
It is desirable to add 0% by weight (hereinafter simply referred to as "excellent"). That is, if the glass fiber content is less than 3IJ4, improvements in impact resistance, arc resistance, heat resistance, insert crack resistance, and dimensional stability tend to be small, and if it exceeds 70*, moldability and molded product appearance deteriorate. This is because the tendency is KToru.

Additives other than amino resin and glass/fiber are amino resin molding materials. The amino resin molding material is obtained by granulation as required.

The present invention will be explained below based on examples.

Examples 1 to 8 and Conventional Example Solid melamine resins with a residual water content of 6 or more were blended, mixed, and crushed according to the formulation table in Table 1 to obtain melamine resin molding materials.

Table 1 The melamine resin molding materials of Examples 1 to 8 and the conventional example were molded for 80 seconds at a molding pressure of loO&j and a molding temperature of 145°C to obtain molded products.The results of the tests were as shown in Table 2. It was confirmed that the amino resin molding material of the present invention has good impact resistance, arc resistance, heat resistance, insert crack resistance, and dimensional stability.

Table 2 Note 1: Tested using a D-Epon falling ball impact tester. A steel ball of Sol is dropped from a height of - and the number of times the molded product breaks is measured.

Jar 2 Based on A8TM 0495.

*8 Heat the molded product at 110°C for 8 hours and check the degree of discoloration.

○ Change to 1 Δ Slight change * 4 JI
8-1c6911.

5 Appearance Judgment of Insert Molded Products 1 [Based on.

○ Good

Claims (2)

[Claims] (1) An amino tree molding material containing glass fiber.゛ (2) The amount of glass fiber is 30 to 70% by weight of the whole.
The amino resin molding material according to claim 1, characterized in that: Amino resin molding material.