JP2001307930A - Coil impregnating resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impregnating resin composition which is well balanced hard unsaturated polyester resin and as high in electrical, mechanical and curing characteristics as usual. SOLUTION: Coil impregnating resin composition is composed of (A) unsaturated polyester whose maleic value rate is 25% or above and oil length is 30% or below and (B) polymerizable monomer, where they are both integral components, and 90 to 270 pts.wt. polymerizable monomer and 100 pts.wt. unsaturated polyester are contained in the coil impregnating resin composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil impregnating resin composition, and is suitably used for insulating a transformer or a coil.

[0002]

2. Description of the Related Art Conventionally, unsaturated polyester resins have been
Because of its excellent electrical, mechanical, curing properties and price,
Widely used in various fields. In general, many of the conventional unsaturated polyester resins are soft having excellent beat characteristics. However, depending on the material and shape of the processed material, a soft varnish may not provide sufficient mechanical strength and curing characteristics.For such a processed material, a hard unsaturated polyester resin is required. Have been.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and is a hard unsaturated polyester resin having a well-balanced electrical, mechanical and hardening characteristic. It is intended to provide a resin composition for impregnation.

[0004]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventors have achieved the above object by increasing the maleic value of the unsaturated polyester resin and shortening the oil length. We have found what we can do and completed the present invention.

That is, according to the present invention, (A) the maleic ratio is 2
An unsaturated polyester having an oil length of 5% or more and an oil length of 30% or less and a polymerizable monomer (B) as essential components;
A resin composition for coil impregnation comprising a polymerizable monomer in a proportion of 90 to 270 parts by weight based on 100 parts by weight of the unsaturated polyester (A).

Hereinafter, the present invention will be described in detail.

The unsaturated polyester (A) used in the present invention is obtained by adding an acid component and an alcohol component and reacting them. As the acidic component used herein, maleic acid, maleic anhydride, fumaric acid, tetrahydrophthalic acid, unsaturated acids such as tetrahydrophthalic anhydride and phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, hexahydrophthalic acid, Saturated acids such as hexahydrophthalic anhydride and adipic acid are listed, and these can be used alone or as a mixture of two or more.

As the alcohol component, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, 1,3-butanediol,
Neopentyl glycol, glycerin, pentaerythritol, tris (2-hydroxyethyl) isocyanurate, polyether polyalcohol and the like can be mentioned, and these can be used alone or in combination of two or more.

The acid component and the alcohol component are subjected to an esterification reaction in excess of alcohol.

The content of the acid component is such that the maleic value is 25%.
It is desirable to use the above amounts. If the maleic value is less than 25%, a sufficient adhesive strength cannot be obtained, which is not preferable. Here, the maleic value is represented by the weight percentage of maleic acid with respect to all the acid components excluding the modified acid component.

The modified components include linseed oil, soybean oil, tall oil, castor oil, coconut oil, dicyclopentadiene and the like, and these can be used alone or as a mixture of two or more. The amount of the denatured component is 30
% Is desirable. If the oil length exceeds 30%, the viscosity is high and the workability deteriorates, which is not preferable. The oil length indicates a modification ratio of the fatty acid with respect to the polybasic acid, and is represented by a weight percentage in which the fatty acid content is calculated as triglyceride.

The polymerizable monomer (B) used in the present invention is an aromatic vinyl compound, for example, styrene,
Examples thereof include vinyltoluene, divinylbenzene, 2,5-dimethylstyrene, 3,4,6-trimethylstyrene, p-chlorostyrene, and p-methoxystyrene, and these can be used alone or in combination.

The compounding amount of the polymerizable monomer is from 90 to 100 parts by weight of the unsaturated polyester (A).
It is desirable to mix 270 parts by weight. If the amount is less than 90 parts by weight, the viscosity is high and the workability is poor.
If it exceeds 270 parts by weight, sufficient mechanical and thermal properties cannot be obtained, which is not preferable.

The resin composition for impregnation of the present invention comprises the unsaturated polyester (A) and the polymerizable monomer (B) as essential components, but within the scope not inconsistent with the object of the present invention, and if necessary, Other ingredients, for example, leveling agents, rust inhibitors,
Flame retardants, fillers, pigments and the like can be appropriately compounded. Further, the resin composition for impregnation can be cured by redox curing, ultraviolet curing, far-infrared curing or the like by blending a polymerization inhibitor, a curing agent, and a curing accelerator. Examples of the polymerization inhibitor to be added and blended here include quinones such as hydroquinone, p-tert-butylcatechol, and pyrogallol, and phenol derivatives, and these can be used alone or in combination of two or more. Examples of the curing agent include organic peroxides, for example, benzoyl peroxide, tertiary butyl peroxide, acetyl peroxide, acyl peroxide such as methyl ethyl ketone peroxide, cumene peroxide and the like, and these may be used alone or in combination of two or more. It can be mixed and used. The amount of the curing agent to be added is determined based on the resin composition for impregnation 100
It is desirable to mix 0.5 to 3 parts by weight with respect to parts by weight. Examples of the curing accelerator include metal salts of naphthenic acid or octylic acid (metal salts such as cobalt, zinc, zirconium, and manganese), and these can be used alone or in combination of two or more.

The resin composition for impregnation of the present invention can be easily produced by blending the above-mentioned unsaturated polyester (A), polymerizable monomer (B) and other components, and uniformly stirring and mixing. it can.

[0016]

The resin composition for impregnation of the present invention has a maleic value of at least 25% and an oil length of at most 30% of the unsaturated polyester. This has the characteristics such as electrical / mechanical characteristics and curability that are possessed by the compound.

[0017]

Now, the present invention will be described in further detail with reference to Examples. However, it should be understood that the present invention is by no means restricted by such specific Examples. In the following Examples and Comparative Examples, “parts” means “parts by weight”.

Example 1 130.9 parts of maleic anhydride and 83.1 of phthalic anhydride
Parts, 141.1 parts of soybean oil fatty acid, 143.2 parts of propylene glycol, 23.1 parts of glycerin and 0.1 part of hydroquinone were added and reacted at 195 ° C. to obtain an unsaturated polyester. To this unsaturated polyester, 0.1 part of hydroquinone, 0.5 part of benzotriazole and 478.3 parts of styrene monomer were added, mixed and diluted, and further 0.5 part of a 6% manganese naphthenate solution was added for impregnation. A resin composition was manufactured.

Example 2 Maleic anhydride 210.2 parts, tetrahydrophthalic anhydride 31.0 parts, soybean oil fatty acid 53.4 parts, propylene glycol 215.0 parts, tris (2-hydroxyethyl) isocyanurate 24.3 parts Parts and hydroquinone 0.07 parts were added and reacted at 190 ° C. to obtain an unsaturated polyester. To this unsaturated polyester, 0.27 part of hydroquinone, 1.37 parts of benzotriazole and 461.4 parts of styrene monomer were added and mixed and diluted.
Further, 9.67 parts of a 6% manganese naphthenate solution was added to produce an impregnating resin composition.

Comparative Example 1 30.2 parts of phthalic anhydride, 228.6 parts of soybean oil fatty acid and 57.9 parts of pentaerythritol were added and the mixture was heated at 210 ° C.
To react. After cooling to 140 ° C., 47.0 parts of propylene glycol, 60.0 parts of maleic anhydride and 0.1 part of hydroquinone were added and reacted at 190 ° C. to obtain an unsaturated polyester. To this unsaturated polyester, 0.14 part of hydroquinone, 4.82 parts of benzotriazole and 579.2 parts of styrene monomer were added, mixed and diluted, and further added with 1.14 parts of a 6% manganese naphthenate solution for impregnation. A resin composition was manufactured.

Comparative Example 2 88.0 parts of maleic anhydride, 29.2 parts of phthalic anhydride,
184.1 parts of soybean oil fatty acid, propylene glycol 8
8.2 parts, 29.2 parts of glycerin and 0.06 part of hydroquinone were added and reacted at 200 ° C. to obtain an unsaturated polyester. To this unsaturated polyester, 0.14 parts of hydroquinone, 1.0 part of benzotriazole and 580.8 parts of styrene monomer were added, mixed and diluted, and 1.2 parts of a 6% manganese naphthenate solution was further added thereto for impregnation. A resin composition was manufactured.

The resin compositions prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were added to 1,1-di-t-butylperoxy-
3,3,5-Trimethylcyclohexane was added, and the tracker test piece was impregnated. The test piece was tested for adhesiveness, and the results were obtained. The effect of the present invention could be confirmed.

[0023]

[Table 1]

[0024]

As is apparent from the above description and Table 1, the resin composition for impregnation of the present invention is hard and has a well-balanced property which also retains the conventional electrical, mechanical and curing properties. is there.

Claims (1)

[Claims] 1. An unsaturated polyester having (A) a maleic ratio of not less than 25% and an oil length of not more than 30%, and (B)
The polymerizable monomer is an essential component, and the polymerizable monomer (B) is used in an amount of 90 parts by weight based on 100 parts by weight of the unsaturated polyester (A).
A resin composition for impregnating a coil, wherein the resin composition is contained in an amount of about 270 parts by weight.