JPS61277107A - Resin composition for insulating electric appliance - 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 (Field of Industrial Application) The present invention relates to a resin composition for insulating electrical equipment, and more specifically to electrical equipment that prevents rust from forming in the cores of electrical equipment such as molds and power transformers. The present invention relates to a resin composition for insulation treatment.

(Prior art) Resin compositions made of unsaturated polyester and crosslinkable monomers are well-balanced in terms of mechanical, electrical, thermal properties, workability, cost, etc., so FRP laminates are used. It is used for many purposes. This resin composition also has excellent characteristics and workability for electrical insulation, so it can be used for fixing coils and cores of models, power transformers, etc., rust prevention, moisture prevention, insulation properties of cores, discharge lamp ballasts, etc. It is often used as an impregnating varnish to improve noise reduction. Recently, these impregnating varnishes have been developed at 25°C in order to improve the impregnating properties of the coil and also to omit the work of scraping off the excess hardened varnish that adheres to the core of the mold.
Low viscosity materials of about 0.1 to 2 poise have come to be used.

However, when conventional low-viscosity varnishes are used to insulate electrical equipment, the hardened film of the varnish is thin, so moisture in the air can cause rust on the coated objects (cores of electrical equipment, etc.) during storage. Particularly in the case of equipment used under high humidity, rust on the core becomes a problem even during short-term storage. When rust occurs in the core of electrical equipment, the product value may decrease, iron loss during operation may increase, and the performance of the equipment may deteriorate. Furthermore, in a small model where the spatial distance between the stator and rotor is short, rotation may become impossible due to rust generated on the surfaces of the stator and rotor.

(Problems to be Solved by the Invention) An object of the present invention is to provide a resin composition for insulating electrical equipment that can eliminate the drawbacks of the prior art and prevent rust from forming in the core of electrical equipment. It's about doing.

(Means for Solving the Problems) In order to achieve the above object, the present inventors have made extensive studies and found that by mixing an alkylphenol-modified xylene resin with an unsaturated polyester varnish, it is more effective than a conventional unsaturated polyester varnish. The present invention was achieved by discovering that the occurrence of rust in the cores of electrical equipment, etc. can be significantly prevented.

The present invention is based on 25 to 60 parts by weight of unsaturated polyester, 75 to 40 parts by weight of crosslinkable monomer, and 100 parts by weight of the total amount of the unsaturated polyester and the crosslinkable monomer.
The present invention relates to a resin composition for insulation treatment of electrical equipment, which contains 2 to 6 parts by weight of an alkylphenol-modified xylene resin.

The unsaturated polyester used in the present invention is obtained by reacting the following acid component and alcohol component, and further, if necessary, a modifying component.

Examples of acid components include maleic acid, maleic anhydride,
Unsaturated acids such as fumaric acid, saturated acids such as phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydrophthalic anhydride, adipic acid, and cepatic acid; Vegetable oil fatty acids such as soybean oil fatty acids, linseed oil fatty acids, and tall oil fatty acids are used.

As the alcohol component, for example, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, 1,3-butanediol, neopentyl glycol, glycerin, trimethylolpropane, pentaerythritol, etc. are used.

As the modifying component, for example, linseed oil, soybean oil, tall oil, dehydrated castor oil, coconut oil, dicyclopentadiene, cyclopentadiene, etc. are used.

Examples of the crosslinkable monomer used in the present invention include styrene, vinyltoluene, α-methylstyrene, tertiary-butylstyrene, divinylbenzene, various acrylic esters and/or methacrylic esters, various allyl esters, and various allyl ethers. etc.

The amount of crosslinking monomer used is 25% of the unsaturated polyester resin.
~60 parts by weight, in the range of 75 to 40 parts by weight,
The total amount of these is 100 parts by weight.

The alkylphenol-modified xylene resin used in the present invention is a xylene resin obtained by reacting a xylene isomer such as meta-xylene, para-xylene, ortho-xylene with formaldehyde, such as dicanol L, LL, HS.
Known novolak type resin obtained by reacting HH (trade name, manufactured by Mitsubishi Gas Chemical Co., Ltd.) with an alkylphenol such as butylphenol, nonylphenol, amylphenol, etc. in the presence of an acid catalyst, such as para-toluenesulfonic acid, hydrochloric acid, etc. It is. Specific examples of alkylphenol-modified xylene resins include Nicanol HP-70,
Examples include HP-120 and HP-240 (trade name, Mitsubishi Gas Chemical Layer). The amount of the alkylphenol-modified xylene resin used is 0.2 to 6 parts by weight based on 100 parts by weight of the total amount of the unsaturated polyester and the crosslinkable monomer.

Addition amount of alkylphenol modified xylene resin is 0.2
If the amount is less than 6 parts by weight, the rust prevention effect will not be sufficient, and
If the amount exceeds parts by weight, the drying properties and pot life of the varnish will decrease.

The resin composition of the present invention includes curing agents such as acyl peroxides such as benzoin peroxide and acetyl peroxide, tert-butyl peroxide,
Hydroperoxides such as cumene hydroperoxide, ketone peroxides such as methyl ethyl ketone peroxide and cyclohexanone peroxide, dialkyl peroxides such as ditertiary butyl peroxide and dicumyl peroxide, and oxyperoxides such as tertiary butyl baroxyacetate. etc. may be added. The amount of curing agent added is determined by the amount of unsaturated polyester,
It is preferably 0.5 to 3% by weight based on the crosslinkable monomer and the alkylphenol-modified xylene resin. Further, a promoter and a polymerization inhibitor can be added as necessary. As the accelerator, for example, manganese naphthenate, lead naphthenate, cobalt naphthenate, cobalt octenoate, etc. are used. As the polymerization inhibitor, for example, quinones such as hydroquinone, tert-butylcatechol, and P-benzoquinone are used.

When electrical equipment is insulated using the resin composition of the present invention, there are no particular limitations on the method, but for example, electrical equipment such as models, power transformers, discharge lamp ballasts, etc.
After preliminary drying by heating at ~140°C for 0.5 to 2 hours, the electrical equipment is left in the air for 10 to 30 minutes, and then immersed in a varnish made of the resin composition of the present invention for 1 to 5 minutes. Pull up and leave in the air for 10-30 minutes, then 100
The varnish may be cured by heating at ~140°C for 1 to 3 hours.

(Effects of the Invention) When electrical equipment is impregnated with the resin composition for insulation treatment of electrical equipment of the present invention and subjected to insulation treatment, it is possible to obtain an electrical equipment whose core and the like are significantly prevented from rusting.

(Example) The present invention will be explained below with reference to Examples. The middle part of the side below is
Means parts by weight.

Production Example 1 836 parts (11 moles) of propylene glycol, 498 parts (3 moles) of isophthalic acid, 392 parts (4 moles) of maleic anhydride.
mol), 456 parts (3 mol) of tetrahydrophthalic anhydride
and 0.22 parts of hydroquinone were placed in a 4-row flask and heated on a heating table at 210°C for 10 hours to synthesize an unsaturated polyester with an acid value of 21.5. 40 parts of this unsaturated polyester, 60 parts of styrene, 8% manganese naphthenate, 0.
5 parts and 1.0 part of benzoyl peroxide were stirred and dissolved to obtain a resin composition A.

Production Example 2 682 parts (11 mol) of ethylene glycol, phthalic anhydride M370! (2.5 mol), 392 parts of maleic anhydride (
4 mol), 380 parts of tetrahydrophthalic anhydride (2,5 mol),
mol) and 0.24 parts of hydroquinone were placed in a micro flask, and heated and condensed at 200°C for 8 to 12 hours to reduce the acid value to 2.
A 0.8 unsaturated polyester was synthesized. 40 parts of this unsaturated polyester, 60 parts of styrene, 0.5 parts of 8% manganese naphthenate and 1.0 parts of benzoyl peroxide.
A resin composition B was obtained by stirring and dissolving a portion.

Examples 1 to 5 Resin compositions of the present invention were obtained by dissolving dicanol HP-120 (alkylphenol-modified xylene resin) in resin composition A at the blending ratio shown in Table 1. Varnishes made of these resin compositions were evaluated for mechanical properties, electrical properties, drying properties, pot life, and core rust prevention ability by the test methods described below, and the results are shown in Table 1.

Note that cases where the amount of alkylphenol-modified xylene resin used is outside the range of the present invention are also shown in Table 1 as Comparative Example 1.

Examples 6 to 8 Nicanol HP-70 (alkylphenol-modified xylene resin) was dissolved in resin composition B at the blending ratio shown in Table 2 to obtain a resin composition of the present invention.

Varnishes made of these resin compositions were evaluated in the same manner as in Example 1, and the results are shown in Table 2.

Note that cases where the amount of alkylphenol-modified xylene resin used is outside the range of the present invention are also shown as Comparative Example 2 in Table 2.

Examples 9 to 11 Resin compositions of the present invention were obtained by dissolving dicanol HP-120 (alkylphenol-modified xylene resin) in resin composition B at the blending ratio shown in Table 2. Varnishes made of these resin compositions were evaluated in the same manner as in Example 1, and the results are shown in Table 2.

Note that cases where the amount of alkylphenol-modified xylene resin used is outside the range of the present invention are also shown in Table 2 as Comparative Example 3.

Comparative Example 4 A varnish made of resin composition A was evaluated in the same manner as in Example 1. The results are shown in Table 1.

Comparative Example 5 A varnish made of resin composition B was evaluated in the same manner as in Example 1, and the results are shown in Table 2.

Test method: (1) Mechanical properties Dumbbell test piece prepared by curing at 120°C for 2 hours (
JIS K 6301 No. 1 dumbbell), 2
The tensile strength and elongation at 3°C were measured using Autograph IM-100 manufactured by Noho Seisakusho.

(2) Volume resistivity Using a 2fi thick resin plate prepared by curing at 120°C for 2 hours, the volume resistivity at 100°C was measured according to JIS C2105.

(3) After applying varnish to dry #144 bonderite treated steel plate,
The varnish was left in a constant temperature bath at 120°C, and the time until the varnish surface lost its stickiness was measured.

(4) Pot life: A φ18 Tsuru test tube was filled with varnish to a height of 7 ml, left in a constant temperature bath at 40° C., and the time required for the varnish to harden was measured.

(5) Rust prevention ability A power transformer with core dimensions of 5A and 66x54x30n+ is immersed in varnish for 2 minutes, then pulled out, left in air for 10 minutes, and cured at 120°C for 2 hours. This varnished power transformer and 60 g of distilled water are placed in a beaker 21, and the beaker is sealed with aluminum foil and polyethylene kelm. After leaving this sealed beaker in a constant temperature bath at 60℃ for 5 days, we observed the state of rust on the core of the power transformer.
Evaluation was made according to the following criteria.

◎: No rust on the core O: Very slight rust on the edge of the core △: Rust on about 10-20% of the surface area of the core ×: Rust on about 40-60% of the surface area of the core From the results in Tables 1 and 2, it is clear that when electrical equipment is insulated using the resin molding of the present invention, the rust prevention ability of the core can be improved without significantly reducing the properties of the resin composition. is shown to be significantly improved.

Claims (1)

[Claims] 1. 25 to 60 parts by weight of unsaturated polyester, 75 to 40 parts by weight of crosslinkable monomer, and 0.2 to 6 parts by weight based on 100 parts by weight of the total amount of the unsaturated polyester and the crosslinkable monomer.
A resin composition for insulation treatment of electrical equipment, which contains part by weight of an alkylphenol-modified xylene resin.