JP2002226526A - Unsaturated polyester resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an impregnating resin composition having excellent drying properties and capable of holding conventional electrical, mechanical and curing characteristics in a well-balanced state. SOLUTION: This impregnating resin composition is characterized as comprising (A) an unsaturated polyester having >=25% maleinization ratio and <=30% oil length and consisting essentially of tetrahydrophthalic anhydride and (B) a polymerizable monomer in an amount of 90-270 pts.wt. based on 100 pts.wt. of the unsaturated polyester (A).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for impregnation, 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 the field of electrical insulation, it is used for impregnating coils and the like.

[0003] In order to improve the productivity of coils and the like, there is always a need for impregnating resin compositions having better curability and drying properties. Further, in a transformer using a lead wire made of a cross-linked polyethylene resin, curing inhibition often occurs due to the influence of a flame retardant, a pigment, a dye, and the like contained in the lead wire, and the drying often occurs insufficiently. If the curability and the drying property are improved as a countermeasure, sufficient electric characteristics and mechanical strength cannot be obtained. Therefore, development of a resin composition capable of improving curability and drying property while maintaining the conventional properties has been desired.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and is an impregnating resin composition which is excellent in drying properties and has a good balance of conventional electrical, mechanical and curing properties. It is intended to provide.

[0005]

Means for Solving the Problems As a result of diligent studies aimed at achieving the above object, the present inventors have increased the maleation ratio of unsaturated polyester, shortened the oil length, and required tetrahydrophthalic anhydride as an essential component. It has been found that the above objects can be achieved by using the components, and the present invention has been completed.

That is, according to the present invention, (A) the maleation ratio is 2
5% or more and an oil length of 30% or less, an unsaturated polyester containing tetrahydrophthalic anhydride as an essential component, and (B) a polymerizable monomer as an essential component, and (B) a polymerizable monomer as (A) an unsaturated polyester. A resin composition for impregnation characterized by being contained in a proportion of 90 to 270 parts by weight with respect to 100 parts by weight.

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 here, tetrahydrophthalic anhydride and maleic anhydride are essential components. 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, and these can be used alone or in combination of two or more.

[0009] These acid components and alcohol components are subjected to an esterification reaction in excess of alcohol.

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

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. The oil length as used in the present invention indicates a modification ratio of a fatty acid with respect to a polybasic acid, and is represented by a percentage by weight in which the fatty acid content is calculated as triglyceride. If the oil length exceeds 30%, the viscosity is high and the workability deteriorates, which is not preferable.

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 mixed 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 set to 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 is characterized in that the maleic conversion of the unsaturated polyester is at least 25%, the oil length is as short as at most 30%, and the essential component of tetrahydrophthalic anhydride is the drying property. And also retains the characteristics of the conventional unsaturated polyester resin such as electrical and mechanical properties and curability.

[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 66.2 parts of maleic anhydride, 43.1 parts of tetrahydrophthalic anhydride, 71.3 parts of linseed oil fatty acid, 72.3 parts of propylene glycol, 11.7 parts of glycerin and 0.05 part of hydroquinone. In addition, the mixture was reacted at 195 ° C. to obtain an unsaturated polyester. To this unsaturated polyester,
0.26 parts of benzotriazole and 235.4 parts of styrene monomer were added, mixed and diluted, and 0.47 parts of a 6% manganese naphthenate solution and 0.09 parts of a 6% cobalt naphthenate solution were added to the resin for impregnation. A composition was prepared.

Example 2 64.8 parts of maleic anhydride, 29.7 parts of tetrahydrophthalic anhydride, 38.9 parts of soybean oil fatty acid, 73.3 parts of ethylene glycol, 19.0 parts of tris (2-hydroxyethyl) isocyanurate Part and hydroquinone 0.05
The mixture was added and reacted at 195 ° C. to obtain an unsaturated polyester. Hydroquinone 0.1 was added to this unsaturated polyester.
09 parts, benzotriazole 0.85 parts and styrene monomer 270.0 parts were added, mixed and diluted.
A 3.4% by weight manganese naphthenate solution was added to produce a resin composition for impregnation.

Comparative Example 1 130.9 parts of maleic anhydride and 83.1 of phthalic anhydride
, 143.1 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.

Comparative Example 2 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.

1,1-Di-tert-butylperoxy-3,3,5-trimethylcyclohexane was added to the resin compositions for impregnation prepared in Examples 1-2 and Comparative Examples 1-2.
A drying test was performed, and the results were obtained.
The effect of the present invention could be confirmed.

[0023]

[Table 1]

[0024]

As is clear from the above description and Table 1, the impregnating resin composition of the present invention has excellent drying properties (especially, good drying properties of lead wires). It is well-balanced while maintaining its curing properties.

Claims (1)

[Claims] 1. An unsaturated polyester having (A) a maleation ratio of 25% or more, an oil length of 30% or less, and tetrahydrophthalic anhydride as an essential component, and (B) a polymerizable monomer as essential components. (B) polymerizable monomer (A)
90 to 270 with respect to 100 parts by weight of the unsaturated polyester
A resin composition for impregnation, characterized in that it is contained in parts by weight.