JPS58172819A - Electrically insulating member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulating member in which a metal insert such as an insulator or bunsing is embedded in a molded resin.

Recently, S-taulownia for heat insulation has been widely used, which is made by embedding a metal insert in an epoxy oil-grip cast product.

However, these members have the disadvantage that when they are placed in a place where there is a high temperature, interfacial stress is generated at the boundary between the epoxy resin cast product, the gold insert, and the insert, causing them to easily peel off.

This is thought to be due to the difference in linear expansion coefficient between the cast product and the insert.

For this reason, various proposals have been made, such as knurling the insert surface, but these are still far from satisfactory.

The present invention has been made to improve such drawbacks, and is made of bisphenol-cut epoxy resin having one or more hydroxyl groups in one molecule. It is applied to an electrically insulating member molded with Rezoki 7 resin having a methylol group.

After applying Brimer MM to the usual Kinpu insert,
After curing to form a film, it is molded with epoxy resin.

The thickness of the skin at this time depends on the size of the electrical insulation member, but is usually 0.05 to 0.30 m.

The reason why the blending ratio of the constituent components of the brimer paint used in the present invention is limited as described above is that if it deviates from the above numerical range, the effect of alleviating the interfacial stress between the insert of the resulting electrically insulating member and the mold resin will be lost.

Bisphenol epoxy resin used in the present invention, e.g., tri'2,2'-bis(4-hydroxyphenyl)
It is obtained by condensation of propane and echylchlorhythrin (!: k) in the presence of NaoH, and has one or more hydroxyl groups in one molecule to improve flexibility and adhesion. These bisphenol type epoxy resins are commercially available from Shell Oil Company under the trade name Epicote 1001, Epicote 1004,
Epicor) 1007, Epicor) 1009, commercially available from Ciba under the trade name Araldite 6071, Araldite 6084, Araldite 6097. Araldite 6099 or the like is used. '□ Also, what is the molecular weight of bisphenol type epoxy resin?

The epoxy equivalent is usually 1,000 to 3,800, and the epoxy equivalent is usually 500 to 3,500.

Also, the number of hydroxyl groups contained in the molecule is usually 12
It is considered to be less than 1.

The resol type xylene phenol resin used in the invention is a co-condensate obtained from xylene, phenol and formaldehyde, and is a 1M resin having a methylol group at the end or middle of the molecule, and the molar ratio of general nixylene to phenol: AE 2/ Average molecular weight 3 in the range of 8 to 8/2
Resins having an average molecular weight of 00 to 800 and preferably 1 to 6 methylol groups in one molecule, particularly preferably those having a somewhat large molar ratio of xylene and an average molecular weight of 400 to 600, are effective.

As epoxy w fat for mold *Jli',
A general-purpose epoxy m*casting composition is preferably used. The metal insert used in the present invention may have its surface roughened by p-left processing, sandblasting, etc. .

When sandblasting, the surface roughness is generally 3.
08-708 Do this so that the angle is 4 degrees.

The present invention will be specifically explained below using examples.

Parts in the examples are parts by weight.

Example 1 A bisphenol epoxy resin (Shell #!) was applied to the molded resin embedded surface of the metal insert (1) shown in FIG.
, Epicor) 11007) 144, resol type xylene phenol resin 50,9. Seaa 7 Lua'acete-)80,9. Apply a brimer paint consisting of 100.9 xylene and 25 g of butanol and heat at 140°C.
, heat cured for 30 minutes to a thickness of 0.08m.
A film (2) was formed. The above-mentioned resol type xylene phenol resin used had an average molecular weight of 500% and an average number of methylol groups in the molecule of 4.The insert and direction were sandblasted to a surface roughness of 50s. there was.

(3) in the figure is an insert screw.

Next, two of these materials were molded (cured at 140'C, 24 hours) using an epoxy resin composition.
An insulator as shown in the figure was obtained.

In the figure, (4) is a cured epoxy resin.

The Hikoo epoxy resin composition having the following formulation was used.9.

Using the obtained insulator with 250 parts of filler (alumina), the tensile breaking strength was measured using an Amsler universal testing machine and found to be 4,430 yen.

On the other hand, the tensile strength at break of an insulator obtained in the same manner as in this example was 3691 kliJ, except that an epoxy resin paint consisting of a bisphenol type epoxy resin and an amine hardener was used as the brimer paint.

Example 2 Bisphenol type epoxy mM'flc7 L Co., Ltd., Epicoat 1004) 160II, resol type xylene phenol Jugetsuji 160,9. A brimer paint consisting of Cellosolve Acetate 1009, 120 g of xylene, and 60 g of butanol was applied and cured by heating at 140° C. for 30 minutes to completely form a film (2) with a thickness of 0.30 m. The resol type xylene phenol resin used had an average molecule of 1 soo and an average number of methylol groups in the molecule of 2.

The sandblasting treatment on the insert surface was performed in Example 1.
It was carried out in the same manner as described.

Next, two of these were molded (cured at 140°C for 24 hours) with an epoxy lubricating composition to form a second mold.
The insulator shown in the figure was obtained.

In the figure, (31) and (31') are insert screws, and (4) is an epoxy resin cured.

As the epoxy m-sweat type composition, the same composition 1 as used in Example 1 was used.

Place the obtained nine insulators horizontally & m of the insert shown in Figure 42.
- When I supported the screw part (31) and applied pressure from point (P), I defined a strong earthquake of Jk at 1270.9
Met.

On the other hand, whether or not an epoxy resin paint made of a bisphenol A type epoxy resin and an acid anhydride curing agent was used as the flamer paint, the bending fracture strength of the insulators obtained in the same manner as in this example was 805 yen.

[Brief explanation of drawings]

FIGS. 1 and 2 are longitudinal sectional views showing an example of the electrically insulating part of the present invention. 1... Metal insert 2... Primer paint film 3...
Insert screw 4... Epoxy resin cured product patent applicant Nitto Electric Industry Co., Ltd. Representative Hijikata Sanbe

Claims (1)

[Claims] Bisphenol type epoxy resin having one or more hydroxyl groups in one molecule 50 to 90 parts, 1 part in one molecule
A resol-type xylene phenol having ~6 methylol groups [110 to 50 XItPAt-containing brimer paint is applied to the surface of a metal insert, and then molded with epoxy resin.