JPS5960816A - Electrically insulating resin composition - 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 electrically insulating resin composition that has excellent curability and storage stability and is suitable for casting and impregnating electrical equipment.

Generally, electrical equipment uses enamelled copper wire, cores, and various other insulating materials that are fixed.

Depending on the purpose, they are used by being cast with an electrically insulating resin composition or by being impregnated for the purpose of improving mechanical strength and protecting them from moisture and various atmospheres.

This electrically insulating resin composition has two characteristics.

Unsaturated polyester resins are often used from the viewpoint of workability.

Recently, we have shortened the processing time for electrical equipment.

In order to save energy and reduce costs, there is a demand for unsaturated polyester resins to cure more quickly than before. Therefore, in conventional unsaturated polyester resins, curing agents and curing accelerators are appropriately selected to achieve rapid curing, but storage stability is extremely short, which poses problems in terms of practical use.

On the other hand, the storage stability can be slightly extended by selecting a polymerization inhibitor, but in this case, the curability is extremely poor, so it is not possible to increase the storage stability and achieve rapid curing. For this reason, in terms of long storage stability and slow curing in the prior art.

At present, there is no product that fully satisfies the requirements of festival processing manufacturers.

As a result of studies, the present inventors found that it has excellent curability.

In addition, a resin composition with long storage stability has been obtained.

The present invention contains 100 parts by weight of an unsaturated polyester resin obtained by using a compound having an allyl ether group and at least one hydroxyl group in the alcohol component and 0.1 to 1.0 parts by weight of a phosphorous acid triester. The present invention relates to a resin composition for electrical insulation.

In the present invention, the compound having an ether group and at least one hydroxyl group is, for example, 9.

Ethylene glycol allyl ether, glycerin allyl ether, glycerin diallyl ether, t+)) tyrolpropane allyl ether.

Trimethylolpropane diallyl ether, neopentyl glycol alcohol ether, etc. are available, and these compounds can be used alone or in combination with the alcohol components normally used in unsaturated polyesters, such as ethylene glycol,
Diethylene/IJ col, propylene glycol, dipropylene glycol, 1.3 butanediol, neopentyl glycol, 1.6 hexane glycol.

Mixed with chrycerin, trimethylolpropane, pentaerythritol, etc., it is used as the alcohol component of unsaturated polyesters.

The acid component of the unsaturated polyester is not particularly limited, and may include maleic acid and maleic anhydride.

Unsaturated acids such as fumaric acid, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydrophthalic anhydride.

Saturated acids such as adipic acid and cepatic acid, soybean oil.

Fatty acids obtained from linseed oil, tall oil, etc. are used.

As a modifying component of the unsaturated polyester, linseed oil, soybean oil, tall oil, dehydrated castor oil, coconut oil, dicyclopentadiene, cyclopentadiene, etc. can be used as necessary.

9 An unsaturated polyester is synthesized using the above-mentioned alcohol component, acid component, and if necessary modifying component by a conventional method, and combined with a crosslinkable monomer.

Unsaturated polyester resins can be obtained.

As the crosslinking monomer, styrene and its derivatives, as well as commonly used various acrylic esters, various methacrylic esters, various allyl esters, various allyl ethers, etc. are used. The blending amount is 20 to 80 weight per ton in the unsaturated polyester resin, preferably 40 to 60 weight.

Examples of the phosphorous triester used in the present invention include triphenyl phosphite, trichloroethyl phosphite, trilauryl phosphite, trisnonyl phenyl phosphite, tris dinonyl phenyl phosphite, and the like.

In addition, in order to specifically adjust the desired curability, 1 commonly used polymerization inhibitors 9 such as quinones such as hydroquinone, paratertiary butylcatechol, and pyrogallol can be used.

The amount of phosphorous triester added is 0.1 to 1.0 parts by weight per 100 parts by weight of the unsaturated polyester resin. If it is less than 0.1 part by weight, the effect of improving storage stability will be small, and if it exceeds 1.0 part by weight, problems 5- will arise in compatibility with festivals and hardenability.

In order to cure the electrically insulating resin composition of the present invention, a curing agent such as acyl peroxide such as benzoyl peroxide or acetyl peroxide, hydroperoxide such as tert-butyl peroxide or cumene hydroperoxide, or methyl ethyl ketone is used. Organic peroxides such as peroxide and ketone peroxide such as cyclohexanone peroxide can be used. The amount of the curing agent used is in the range of 0.5 to 5 parts by weight, preferably 1 to 3 parts by weight, based on 100 parts by weight of the unsaturated polyester resin.

Furthermore, when curing the electrically insulating resin composition of the present invention, naphthenic acid metal salts and octenoic acid metal salts (e.g. cobalt, manganese,
Iron, lead, etc.) may be used, but the amount used is in the range of 0.1 to 5 parts by weight per 100 parts by weight of the unsaturated polyester resin.

Examples and comparative examples will be explained. The part is 6- Parts by weight.

Example Production of unsaturated polyester resin A 35 parts of soybean oil fatty acid, 10 parts of phthalic anhydride, 15 parts of maleic anhydride,
30 parts of diglobylene glycol, 10 parts of l-methylolpropane diallyl ether, and 0.02 parts of hydroquinone were subjected to thermal condensation at 190°C for 15 hours to synthesize an unsaturated polyester with an acid value of 15. 50 parts of styrene was stirred and dissolved to obtain unsaturated polyester resin A.

Comparative Example Production of unsaturated polyester resin B 35 parts of soybean oil fatty acid, 10 parts of phthalic anhydride, 15 parts of maleic anhydride,
Dipropylene glycol 40 parts, hydroquinone 0.0
Two parts were heated on a heating stand at 200°C for 10 hours to synthesize an unsaturated polyester with an acid value of 13.
50 parts of styrene was stirred and dissolved to obtain an unsaturated polyester resin B.

Unsaturated polyester resins A and B were mixed with phosphorous acid triester (parts by weight) as shown in Table 1, and 0.1 part by weight of tositepenzoyl peroxide was added as a curing agent.

8% manganese naphthenate 0.5 li as curing accelerator
A composition was prepared by adding parts by weight, and the properties were measured.

The results are shown in Table 1.

9- In the table, ○ indicates good condition, Δ indicates some problem, and × indicates problem.

Regarding the appearance of the resin composition, pour the resin composition onto a tin plate cut to size according to JIS C2105, apply the coating, hang it in the length direction, leave it in a constant temperature bath at 100°C for 20 minutes, then take it out and dry the coating film. The condition was determined by touch.

Regarding curability, the resin composition is 20 mm in diameter and 60 mm in diameter. The resin composition was placed in a constant temperature bath at 100° C. for 20 minutes, then taken out, and the cured state of the resin composition was evaluated by touch.

Regarding storage stability, the resin composition was placed in a test tube with a diameter of 18 cm. After sealing the tube, it was placed in a constant temperature bath at 40° C., and the number of days until the resin composition gelled was measured.

Example 1 The electrically insulating resin composition of the present invention is
It is shown that it has excellent curability and storage stability.

10-

Claims (1)

[Claims] 1. Contains 100 parts by weight of an unsaturated polyester resin obtained by using a compound having an allyl ether group and at least one hydroxyl group in the alcohol component and 0.1 to 1.0 parts by weight of a phosphorous acid triester. Resin composition for electrical insulation.