JPS5825350A - 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, are, heat and insert cracking and dimensional stability, by incorporating glass fiber and an org. fiber in an amino resin. CONSTITUTION:Glass fiber, pref., of alkali-free glass and an org. fiber such as polyvinyl alcohol fiber are added to an amino resin, pref. solid melamine resin to obtain the desired amino resin molding material. The amount of glass fiber to be added is not critical. Pref. glass fiber is used in an amount of 0.5-70wt% based on that of the resulting molding material. The org. fiber is used in an amount of pref. 0.5-20wt%. Other additives such as hardener, parting agent, etc. may be added.

Description

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

Conventionally, pulp, wood flour, etc. have been added to amino resin molding materials 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 drawback of not being able to keep up with the trend of micronization.

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

Next, the present invention will be explained in detail. The amino resins used in the present invention are Nida resin, melamine resin, and guanamine 11111.
, amino resins such as phenol to modified melamine resins, which may be in either liquid or solid form (although not particularly limited, it is preferable to use melamine resins, especially solid melamine resins). That is, impact resistance, arc resistance, and heat resistance tend to be important in gardens. Although glass fiber is not particularly limited, it is preferable to use glass fiber.
*It is desirable to use reglass. In other words, electric spears tend to be better. Organic fiber Toshi-C111
11 fiber, polyamide fiber, l-vinyl alcohol-#II
All bridged fibers such as polyester fibers and polyacrylic fibers can be used, and there are no particular limitations. The amount of fiber is particularly limited, but preferably the total OJ ~ 7
It is desirable to add 0% by weight (hereinafter simply referred to as "excellent"). In other words, less than 0.5 S has better impact resistance, arc resistance,
This is because improvements in heat resistance, in-line resistance, and dimensional stability tend to be small, and when the length exceeds 70 m, moldability and appearance of the molded product tend to deteriorate. Further, it is desirable that the amount of organic fiber added is preferably 0.5 to 2011. That is, if the content is less than O and S%, the glass fibers tend to be easily broken during the molding material manufacturing process, and if it exceeds Toll or S, the arc resistance tends to decrease. As additives other than amino resin, glass fiber, and organic fiber, curing agents, mold release agents, fillers, coloring agents, etc. commonly used as amino resin molding materials can be used, and the above materials are kneaded, It is pulverized and, if necessary, granulated to obtain a °C amino resin molding material.

The present invention will be explained below based on examples.

Examples 1 to 8 and Conventional Examples Using solid melamine W fingers with a residual thin ice content of 6%, they were blended at °C according to the recipe shown in Table Is1, and then kneaded and crushed to obtain melamine resin molding materials.

Table 1 shows the results of molding the melamine resin molding materials of Examples 1 to 8 and the conventional example for 80 seconds at a molding pressure of 10 om/j and a molding temperature of 5"C. The test results are shown in Table 182. As shown, the impact resistance, arc resistance,
It was confirmed that the present invention was excellent in heat resistance, insert hook resistance, and dimensional stability.

Table 2 Note: DuPont falling ball impact testing machine number. 5009 steel ball is dropped from a height of 50 cm and the number of times the molded product breaks is measured.

! l) 2 According to A8TM D495.

◆8 Heat the molded product at 180°C for 2 hours and check the degree of discoloration in appearance.

0 Change, Poppy Δ Slight change *4 According to JIS-Kllll.

Hata 6 Based on the appearance judgment of insert molded products.

○ Good × Cracks occur *6 Shrinkage rate after heating the molded product at 110°C for 168 hours Patent applicant Matsushita Electric Works Co., Ltd. Patent attorney Toshimaru Takeyo (and 2 others)

Claims (1)

[Claims] 11) An amino resin molding material characterized by containing glass fiber and organic fiber. (2) The amino resin molding material according to claim 1, characterized in that the amount of fibers is 0.6 to 70% by weight of the whole, and the amount of organic fibers is Oj-weighted. Amino resin molding material.