JP2000007739A - Impregnating resin composition and electrical appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impregnating resin composition which shows a good solderability at an impregnated, coated state and retains conventional electrical and mechanical properties and curability at a good balance, and an electrical appliance. SOLUTION: This impregnating resin composition essentially comprises (A) a tolylene diisocyanate-modified unsaturated polyester and (B) a polymerizable monomer, wherein 20 to 50 wt.% tolylene diisocyanate is contained in (A) the toylene diisocyanate-modified unsaturated polyester, and (B) the polymerizable monomer is blended at a proportion of 60 to 150 pts.wt. against 100 pts.wt. tolylene diisocyanate-modified unsaturated polyester. Furthermore, an electrical appliance is impregnated with the resin composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tolylene diisocyanate-modified unsaturated polyester resin composition having good solderability, and an electric device impregnated with the composition.

[0002]

2. Description of the Related Art Unsaturated polyester resins are widely used in various fields because of their excellent electrical, mechanical, curing properties and cost. In the field of electrical insulation, it is used for impregnating coils and the like.

However, when electric equipment (pin type transformer, etc.) is impregnated with a conventional unsaturated polyester resin, a portion (pin) to be soldered in a later process is coated with the unsaturated polyester resin, and the resin is coated. In this case, there is a drawback that the solder does not adhere. Therefore, it is necessary to perform a pre-process of masking a portion to be soldered with a thermoplastic resin before the impregnation process, and to remove the thermoplastic resin mask after the dry heat treatment and before the solder process. .

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the conventional impregnation of unsaturated polyester resin, and the solderability with impregnated coating is good. Another object of the present invention is to provide a conventional resin composition for impregnation, which maintains a good balance of electrical, mechanical, and curability, and electrical equipment impregnated with the resin composition.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, it has been found that the above object can be achieved by an unsaturated polyester resin containing a predetermined amount of tolylene diisocyanate as a urethane modification. The present invention has been completed.

That is, the present invention comprises (A) a tolylene diisocyanate-modified unsaturated polyester and (B) a polymerizable monomer as essential components, and (A) tolylene diisocyanate-modified unsaturated polyester contains 20 to A polymerizable monomer (B) in an amount of 60 to 150 parts by weight based on 100 parts by weight of tolylene diisocyanate-modified unsaturated polyester. It is a resin composition.
Further, the present invention is an electrical device characterized by being impregnated with the resin composition.

Hereinafter, the present invention will be described in detail.

The acid component of the (A) tolylene diisocyanate-modified unsaturated polyester used in the present invention includes phthalic anhydride, phthalic acid, isophthalic acid, terephthalic acid,
Examples include tetrahydrophthalic anhydride, maleic anhydride, fumaric acid, maleic acid, and itaconic acid. As the alcohol component, ethylene glycol, propylene glycol, 1,3-butanediol, hydrogenated bisphenol A, alkylene oxide adduct of bisphenol A,
Alcohol components such as pentaerythritol,
These acid component and alcohol component may be used alone or in combination.
A mixture of more than one species can be used.

The acid component and the alcohol component are subjected to an esterification reaction in excess of alcohol to synthesize a polyester, and then tolylene diisocyanate is added to react with the terminal hydroxyl group of the polyester. Also,
Examples of the modified resin include a vegetable oil, an epoxy compound, a cyclopentadiened oil, an epoxidized oil, a petroleum resin, a thermoplastic resin, and the like, and these can be used alone or as a mixture of two or more. The content of tolylene diisocyanate is 100 parts of tolylene diisocyanate-modified polyester.
20 to 50 parts by weight with respect to parts by weight. If the content is less than 20 parts by weight, the solderability will decrease, and if it exceeds 50 parts by weight, the curability will decrease.

The polymerizable monomer (B) used in the present invention includes styrene monomers, styrene derivatives, acrylates, methacrylates, various aryl esters, and the like. These may be used alone or as a mixture of two or more. be able to. The compounding amount of the polymerizable monomer is desirably 60 to 150 parts by weight based on 100 parts by weight of the above-mentioned (A) urethane-modified unsaturated polyester with tolylene diisocyanate. If the amount is less than 60 parts by weight, the viscosity is high and the workability is poor, and the solderability is low. On the other hand, if it exceeds 150 parts by weight, sufficient mechanical and thermal properties cannot be obtained, which is not preferable.

The impregnating resin composition of the present invention comprises (A) a tolylene diisocyanate-modified unsaturated polyester resin and (B) a polymerizable monomer as essential components, but other components as far as the object of the present invention is not adversely affected. For example, leveling agents,
Rust inhibitors, flame retardants, fillers, pigments and the like can be added and blended. Further, the resin composition for impregnation can be cured by redox curing, ultraviolet curing, far-infrared curing, etc. by blending a polymerization inhibitor, a curing agent, a curing accelerator and the like. Examples of the polymerization inhibitor to be added here include quinones and phenol derivatives. Examples of the curing agent include acyl peroxides such as benzoyl peroxide, tertiary butyl peroxide, and acetyl peroxide, cumene peroxide, and the like, and these can be used alone or in combination of two or more. The addition amount of the curing agent is 0.5 to 100 parts by weight of the resin composition for impregnation.
It is desirable to add 3.0 parts by weight. Examples of the curing accelerator include metal salts of naphthenic acid or octylic acid (metal salts such as cobalt, manganese, zinc, and zirconium), and these can be used alone or in combination of two or more.

The resin composition for impregnation of the present invention is produced by blending (A) the above-mentioned tolylene diisocyanate-modified unsaturated polyester resin, (B) a polymerizable monomer and other components. Also, electrical equipment can be manufactured using the resin composition for impregnation, but the method for impregnation of the resin composition for impregnation is not particularly limited,
Any method may be used.

[0013]

The resin composition for impregnation of the present invention improves the solderability by modifying urethane with tolylene diisocyanate when synthesizing an unsaturated polyester.
At the same time, the properties of the conventional unsaturated polyester resin composition such as electrical, mechanical and curable properties are maintained.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples. In the following Examples and Comparative Examples, "parts" means "parts by weight".

EXAMPLE 98 g of maleic acid and 132 g of ethylene glycol were mixed with 220 g of
℃ to synthesize unsaturated polyester,
88g of tolylene diisocyanate while cooling to below ℃
Was dropped (10 g / min) to obtain a tolylene diisocyanate-modified unsaturated polyester. To the unsaturated polyester, 0.2 part of hydroquinone and 742 parts of styrene monomer were added, mixed and diluted, and 0.70 parts of a 6% manganese naphthenate solution was added to prepare an impregnating resin composition.

Comparative Example 112 parts of soybean oil fatty acid, 44.4 parts of phthalic anhydride, maleic acid
29.4 parts and 98 parts of propylene glycol were reacted at 220 ° C. to obtain an unsaturated polyester. To this unsaturated polyester was added 0.1 part of hydroquinone and 44 parts of styrene monomer.
3.8 parts was added, mixed and diluted, and 0.40 part of a 6% manganese naphthenate solution was further added to produce an impregnating resin composition.

1,1-di-t-butylperoxy-3,3,5-trimethylcyclohexane was added to the resin compositions for impregnation prepared in Examples and Comparative Examples, and impregnated with a pin type transformer. . The pin terminal portion of the transformer was immersed in a solder bath, and a solderability test was performed. The results were obtained. The soldering was possible to the pin terminal portion of the transformer treated with the resin composition for impregnation of the present invention, and the effect of the present invention was confirmed.

[0018]

[Table 1] * 1: The percentage of solder that adhered to the pin surface when the pin terminals treated with the impregnating resin composition were placed in a solder bath at 380 ° C for 3 seconds.

[0019]

As is clear from the above description and Table 1, the impregnating resin composition of the present invention is easy to solder, and retains the conventional flexibility and electrical, mechanical and hardening properties. The electrical equipment impregnated with this composition is easy to solder after processing.

Continued on the front page F term (reference) 4J002 CF271 EA046 EH076 FD206 GQ01 4J027 AB06 AB07 AB08 AB15 AB16 AB18 AB23 AB25 AB34 BA02 BA03 BA04 BA05 BA07 CD06 5G305 AA02 AA12 AB36 AB40 CA12 CA18 CA55

Claims (2)

[Claims] (1) Tolylene diisocyanate-modified unsaturated polyester and (B) a polymerizable monomer as essential components, and (A) tolylene diisocyanate-modified unsaturated polyester contains 20 to 50% by weight of tolylene diisocyanate. A resin composition for impregnation, characterized in that (B) a polymerizable monomer is blended in an amount of 60 to 150 parts by weight based on 100 parts by weight of tolylene diisocyanate-modified unsaturated polyester. 2. An unsaturated polyester modified with tolylene diisocyanate (A) and a polymerizable monomer (B) as essential components, and 20 to 50% by weight of tolylene diisocyanate is added to (A) the unsaturated polyester modified with tolylene diisocyanate. (B) The polymerizable monomer is impregnated with an impregnating resin composition in which the polymerizable monomer is blended in an amount of 60 to 150 parts by weight with respect to 100 parts by weight of the tolylene diisocyanate-modified unsaturated polyester. Electrical equipment characterized by the following.