JPH07224125A - Resin composition for electric insulation and electric equipment - Google Patents

Abstract

PURPOSE:To provide the resin composition low in viscosity, free from the cissing of a coating film, having a smooth appearance, good in an air-drying property, excellent in thermal characteristics, mechanical characteristics, and chemical characteristics, and capable of producing highly reliable electric equipments by immersing electric wires, etc., in the resin composition because of not causing the breakage of electric wire coatings. CONSTITUTION:A resin composition for electric insulation contains (A) 5-70 pts.wt. of an epoxyacrylate resin, (B) 95-30 pts.wt. of an unsaturated polyester resin modified with 5-30wt.% of a thermoplastic polyester resin, and (C) a reactive monomer as essential components, wherein the reactive monomer (C) being compound in an amount of 300-480 pts.wt. per 100 pts.wt. of the resin components [(A)+(B)]. An electric equipment is produced by impregnating the resin composition and subsequently curing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition used for impregnation of motor coils and the like, which has a low viscosity, a good coating appearance, and excellent properties such as rust prevention of bearings. Related to electrical equipment.

[0002]

2. Description of the Related Art Resin compositions containing epoxy acrylate resins are used in various fields because of their excellent mechanical, electrical, thermal, chemical, and curing properties. It is used for business.

However, when a conventional epoxy acrylate resin is used for impregnating a motor coil of an electric motor, there is a drawback that the solubility to a reactive monomer is limited and a desired low viscosity cannot be obtained. Although it seems to be due to the characteristic peculiar to the epoxy acrylate resin, as the viscosity decreases, cissing occurs on the varnish coating film, and there is a problem that a smooth coating film with good air-drying property cannot be obtained. In addition, when using a varnish containing only an epoxy acrylate resin, the balance between stock life and curing and drying properties is poor compared to conventional varnishes such as unsaturated polyester resin and epoxy ester resin, and the cost is high. was there. In addition, conventional electrical equipment impregnated with epoxy acrylate resin varnish has a large shear adhesive strength of the varnish cured product,
Even if there is a slight varnish deposit, there is a harmful effect of breaking the base material such as an electric wire during the work of attaching and detaching the hanger and the object to be processed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks and has a smooth appearance with no cissing on a varnish coating film even if it has a low viscosity and has a good air-drying property. , A resin composition for electrical insulation of epoxy acrylate, which has excellent thermal characteristics, mechanical characteristics, chemical characteristics, has no breakage on the motor coil, and has a good balance of those characteristics, and electrical treatment with the resin composition It is intended to provide equipment.

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventor has found that the below-mentioned epoxy acrylate resin composition can achieve the above object, and It has been completed.

That is, the present invention provides an unsaturated polyester resin 95 modified with (A) 5 to 70 parts by weight of an epoxy acrylate resin and (B) 5 to 30% by weight of a thermoplastic polyester resin.
To 30 parts by weight and (C) a reactive monomer as essential components,
Resin composition for electrical insulation, characterized in that it is added in a proportion of 300 to 480 parts by weight of the reactive monomer of (C) with respect to 100 parts by weight of the resin component [(A) + (B)]. It is a thing. Moreover, it is an electric device characterized by being impregnated and cured using the resin composition.

The present invention will be described in detail below.

The (A) epoxy acrylate resin used in the present invention is, for example, one or more epoxy resins of bisphenol A type, bisphenol F type, polyphenol type, halogenated bisphenol type, polyvalent glycidyl ester type and the like. It is a general epoxy acrylate resin obtained by subjecting an epoxy group and one or more derivatives of acrylic acid or methacrylic acid to an esterification reaction while preventing polymerization of an acryloyl group. Further, if necessary, ester modification can be carried out with phthalic anhydride, tetrahydrophthalic anhydride, hydroxymethacrylic acid or the like. It is desirable that the epoxy resin for synthesizing the epoxy acrylate resin has an epoxy equivalent of not more than 1000, preferably not more than 500. If the epoxy equivalent exceeds 1000, not only the solubility with respect to the reactive monomer is lowered and the viscosity is increased, but also the compatibility with the unsaturated polyester resin is remarkably lowered, which is not preferable. The mixing ratio of the epoxy acrylate resin is preferably 5 to 70 parts by weight. If the amount is less than 5 parts by weight, sufficient mechanical, electrical and thermal properties cannot be obtained, which is not preferable. On the other hand, if the amount exceeds 70 parts by weight, the viscosity is not lowered and the air-drying property and the sufficient flexibility are not obtained, which is not preferable.

As the unsaturated polyester resin (B) used in the present invention, an unsaturated polyester resin modified with a thermoplastic polyester resin is used. Examples of the thermoplastic polyester resin used for modification include polyethylene terephthalate and polybutylene terephthalate, and one or more of these are used to modify the unsaturated polyester resin by transesterification or the like. The modification ratio of the thermoplastic polyester resin is desirably compounded and modified so as to impregnate the unsaturated polyester resin with 5 to 30% by weight of the thermoplastic polyester resin. The unsaturated polyester resin is obtained by reacting an acidic component and an alcohol component, and if necessary, a modifying component other than the thermoplastic polyester resin is added. Examples of the acid component used here include unsaturated acids such as maleic acid, maleic anhydride, fumaric acid and phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, anhydrous Examples thereof include saturated acids such as hexahydrophthalic acid and adipic acid, and these can be used alone or in combination of two or more kinds. Examples of the alcohol component include propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, 1,3-butanediol, neopentyl glycol, glycerin, pentaerythritol, and polyether polyalcohol, which may be used alone or in combination of two or more. Can be used. Examples of the modifying component other than the thermoplastic polyester resin include linseed oil, soybean oil, tall oil, petroleum resin, dicyclopentadiene, etc. These can be used alone or in combination of two or more. The mixing ratio of unsaturated polyester resin is 95-30
It is desirable that the amount is parts by weight. If the content is less than 30 parts by weight, sufficient flexibility cannot be obtained, and if it exceeds 95 parts by weight, sufficient mechanical, electrical and thermal properties cannot be obtained, which is not preferable.

Examples of the (C) reactive monomer used in the present invention include styrene, styrene derivatives, acrylic acid esters,
Methacrylic acid esters, various allyl esters and the like can be mentioned, and these can be used alone or in admixture of two or more. The mixing ratio of the reactive monomer is the same as the above (A).
It is desirable to add 300 to 480 parts by weight to 100 parts by weight of the total amount of the epoxy acrylate resin and the (B) unsaturated polyester resin. If the amount is less than 300 parts by weight,
High viscosity, impairs the work of detaching from the hanger, and
If it exceeds 80 parts by weight, sufficient mechanical and thermal properties cannot be obtained, which is not preferable.

The resin composition of the present invention contains an epoxy acrylate resin, an unsaturated polyester resin and a reactive monomer as essential components, but other components may be added within the range not deviating from the object of the present invention, and if necessary. For example, a curing agent, a curing accelerator, a polymerization inhibitor, etc. can be added and blended. Examples of the curing agent include organic peroxides such as benzoyl peroxide, tertiary butyl peroxide, acetyl peroxide, and other acyl peroxides, cumene hydroperoxide, and the like. These may be used alone or in combination of two or more. Can be used. The addition amount of the curing agent is preferably 0.5 to 3 parts by weight with respect to 100 parts by weight of the resin composition. Examples of the curing accelerator include metal salts of naphthenic acid or octenoic acid (metal salts of cobalt, manganese, zinc, zirconium, etc.), and these can be used alone or in combination of two or more. Examples of the polymerization inhibitor include quinones such as hydroquinone, paratertiary butyl catechol, and pyrogallol, which may be used alone or in combination of two or more.

The resin composition of the present invention can be easily manufactured by blending the above-mentioned epoxy acrylate resin, unsaturated polyester resin, reactive monomer and other components and uniformly mixing them. Then, the composition can be impregnated and cured in an electric device such as a motor coil by a dipping method, a dropping impregnation method, or the like to manufacture an electric device. The impregnation method is not particularly limited, and any method may be used.

[0013]

The resin composition and the electric device of the present invention use the epoxy acrylate resin together with the unsaturated polyester resin modified with the specific amount of the thermoplastic polyester resin to reduce the viscosity without cissing and the reactive monomer. It was possible to enhance the compatibility with and to obtain appropriate air-drying property and sufficient flexibility. And by using unsaturated polyester resin modified with a specific amount of thermoplastic polyester resin, the mechanical life, electrical performance, and thermal performance are improved, and the balance between stock life and air-dry property is maintained without impairing the properties of epoxy acrylate resin. It is intended to prevent the generation of rust.

[0014]

EXAMPLES Next, the present invention will be described with reference to examples, but the present invention is not limited to these examples. In the examples and comparative examples, "parts" means "parts by weight" unless otherwise specified. A. Production of Epoxy Acrylate Resin A-1 Epoxy Resin Epicoat # 8 having an epoxy equivalent of 180 to 210
28 (manufactured by Shell Co., trade name) 160 parts, epoxy equivalent 450
100 parts of epoxy resin Epicoat # 1001 (trade name) manufactured by Shell Co., 169 parts of methacrylic acid, 1 part of 2,4,6-tris (dimethylamino) phenol and 0.08 parts of hydroquinone are reacted at 90 to 100 ° C. A resin having an acid value of 25 was obtained. Hydroquinone (0.02 parts) and styrene (55 parts) were added to the resin (45 parts) and dissolved by stirring to produce an epoxy acrylate resin. A-2 2-hydroxyethyl methacrylate 120 parts, tetrahydrophthalic anhydride 140 parts, 2,4,6-tris (dimethylaminomethyl) phenol 0.65 parts and hydroquinone
0.09 parts were reacted at 90-100 ° C for 2 hours, and then epoxy resin Epicoat # 828 with an epoxy equivalent of 180-210.
183 parts (trade name, manufactured by Shell Co.) was added and reacted at 90 to 100 ° C. to obtain a resin having an acid value of 10. Hydroquinone 0.02 parts and styrene 55 parts were added to 45 parts of the resin and dissolved by stirring,
An epoxy acrylate resin was produced. B. Production of modified unsaturated polyester resin B-1 160 parts of polyethylene terephthalate, 190 parts of neopentyl glycol and 0.1 part of tetrabutyl titanate are added,
After reacting at 210-230 ° C for 2 hours and cooling, add 150 parts of phthalic anhydride and 0.2 parts of hydroquinone and add 1 part.
The reaction was carried out at 80 to 190 ° C to obtain a resin having an acid value of 10. This resin
Hydroquinone 0.01 parts to 45 parts, styrene 45 parts and 2-
10 parts of hydroxyethyl methacrylate was added and dissolved by stirring to produce a modified unsaturated polyester resin. B-2 160 parts of polyethylene terephthalate, 200 parts of diethylene glycol and 0.1 part of tetrabutyl titanate, 2 parts
After reacting at 10 to 230 ° C for 2 hours and then cooling, 150 parts of maleic anhydride and 0.2 parts of hydroquinone were added and
The reaction was carried out at 80 to 190 ° C to obtain a resin having an acid value of 20. This resin
Hydroquinone 0.01 parts to 45 parts, styrene 45 parts and 2-
10 parts of hydroxyethyl methacrylate was added and dissolved by stirring to produce a modified unsaturated polyester resin.

Examples 1 to 2 The compositions shown in Table 1 were blended and sufficiently stirred to produce a resin composition.

Comparative Examples 1 and 2 Resin compositions were prepared by blending the compositions shown in Table 1 and thoroughly stirring.

With respect to the resin compositions produced in Examples 1 and 2 and Comparative Examples 1 and 2, and electrical equipment impregnated with these resin compositions, the viscosity, the appearance of the coating film, the appearance of the article to be treated, A rust test was conducted, and the results are shown in Table 1. The present invention was excellent in property balance, and the effects of the present invention could be confirmed.

[0018]

[Table 1] * 1: ○: Good, ×: Repellent. * 2: Outer diameter 90 to 140 mm, core stacking thickness 30 to 60 mm, weight
Table 2 shows stator coils A, B and C of 1 to 8 kg size.
Prepared as shown in Fig. 1 and impregnated with dope under the curing condition of 130 ℃ × 1 H, and the appearance after varnish treatment shows that the varnish pool at the bottom of the coil and the varnish pool at the bottom of the core-horizontal part are 2 mm.
The criteria below were the following heights. ○: Good,
X mark: The amount of varnish accumulated is large. * 3: A stator coil for a ventilation fan is impregnated with a composition containing a curing agent and a curing accelerator at room temperature for 5 minutes, and after a 10-minute drop, it is placed on a Teflon-coated iron bar and heated and dried at 120 ° C x 1 H. The test piece was used. This test piece was placed in a 1-liter beaker together with one bearing (NS7S, NS7S) and an aqueous glycerin solution (64 parts by weight of glycerin / 36 parts by weight of distilled water), sealed with a polyethylene sheet, and stored in a constant temperature bath at 40 ° C. After 8000 hours, the bearing was not rusted and the concentration of organic acid ions in the aqueous glycerin solution in the beaker did not exceed 300 ppm. ○
Mark ... Good.

[0019]

[Table 2]

[0020]

As is apparent from the above description and Table 1, the resin composition of the present invention has a low viscosity, has no cissing of the coating film, has a smooth appearance, is well air-dried and has good thermal characteristics. In addition, it has excellent mechanical properties and chemical properties, and has no breakage of the electric wire coating. By impregnating with this resin composition, highly reliable electric equipment can be manufactured.

Claims (2)

[Claims] 1. (A) Epoxy acrylate resin 5 to 70
Parts by weight, (B) 95 to 30 parts by weight of an unsaturated polyester resin modified with 5 to 30% by weight of a thermoplastic polyester resin, and (C) a reactive monomer as essential components, and the resin component [(A) + (B)] A resin composition for electrical insulation, characterized in that the reactive monomer of (C) is blended in a proportion of 300 to 480 parts by weight with respect to 100 parts by weight. 2. (A) Epoxy acrylate resin 5 to 70
Parts by weight, (B) 95 to 30 parts by weight of an unsaturated polyester resin modified with 5 to 30% by weight of a thermoplastic polyester resin, and (C) a reactive monomer as essential components, and the resin component [(A) + (B)] An electric device characterized by being impregnated and cured using a resin composition containing 300 to 480 parts by weight of the reactive monomer (C) per 100 parts by weight.