JPH07242807A - Impregnating resin composition - Google Patents

Abstract

PURPOSE:To obtain an impregnating resin composition free from discoloration of a magnet wire because of little free acid component contained in it, holding the conventional softness and electrical, mechanical and curing properties in a well-balanced manner and capable of producing an electrical apparatus having high reliability by treating with the resin composition. CONSTITUTION:This impregnating resin composition contains (A) an unsaturated polyester resin comprising (a) isophthalic acid and/or terephthalic acid and (b) an unsaturated polyester resin containing a vegetable fatty acid and (B) a polymerizable monomer as essential components. In this composition, the isophthalic acid and the terephthalic acid of the component (a) are contained in an amount of 10-70% based on the total of the acid equivalent of the unsaturated polyester resin and the polymerizable monomer (B) is contained in an amount of 200-400 pts.wt. based on 100 pts.wt. of the unsaturated polyester resin.

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 in which a magnet wire is not discolored and electric equipment impregnated with the composition.

[0002]

2. Description of the Related Art Unsaturated polyester resins are widely used in various fields because they are excellent in electrical, mechanical, curing properties and cost. In the electrical insulation field, it is used for impregnation of coils and the like.

However, when electric equipment is impregnated with a conventional unsaturated polyester resin, there is a drawback that the magnet wire is discolored (blackened) when absorbing moisture. This is because the conventional unsaturated polyester resin has a large amount of free acid component, and the free acid component causes the magnet wire to be discolored, which deteriorates the adhesiveness of the coating and impairs the appearance.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks. It has a small amount of free acid components and does not cause discoloration of the magnet wire, and has the conventional flexibility and electrical, mechanical and curing properties. An object of the present invention is to provide a well-balanced resin composition for impregnation that also retains properties, and an electric device impregnated with the composition.

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventor has found that the above object can be achieved by blending a specific saturated polybasic acid in a predetermined amount. They have found and completed the present invention.

That is, according to the present invention, an unsaturated polyester resin containing (A) (a) isophthalic acid or / and terephthalic acid and (b) a vegetable oil fatty acid as an essential component and (B) a polymerizable monomer are used as the unsaturated polyester resin. In the ratio (a) of isophthalic acid and terephthalic acid to the total basic acid equivalent of 10 to 70%, and unsaturated polyester resin 1
200 to 200 parts by weight of the above-mentioned (B) polymerizable monomer
An impregnating resin composition characterized by being mixed in a proportion of 400 parts by weight. Moreover, it is an electric device which is impregnated with the resin composition for impregnation.

The present invention will be described in detail below.

As the unsaturated polyester resin (A) used in the present invention, an acid component containing (a) isophthalic acid or / and terephthalic acid and (b) vegetable oil fatty acid is used.

The (a) isophthalic acid or terephthalic acid is usually used as an acid component of the polyester resin and is not particularly limited. Specific examples include isophthalic acid, isophthalic anhydride, terephthalic acid, etc. These may be used alone or in combination. In addition to the isophthalic acid and terephthalic acid, unsaturated polybasic acids, saturated polybasic acids, polyhydric alcohols, modified resins and the like can be used. Examples of unsaturated polybasic acids include fumaric acid, maleic acid, maleic anhydride, and itaconic acid. Examples of the saturated polybasic acid include phthalic acid, tetrahydrophthalic anhydride, adipic acid and the like. Examples of the polyhydric alcohol as the alcohol component include ethylene glycol, propylene glycol, diethylene glycol, neopentyl glycol, glycerin, 1,3-butanediol, hydrogenated bisphenol A and bisphenol A.
Examples thereof include alkylene oxide adducts and pentaerythritol, and these may be used alone or in combination of two or more kinds. Examples of the modified resin include isocyanate compounds, epoxy compounds, cyclopentadiene oils, epoxidized oils, petroleum resins, and thermoplastic resins. The blending ratio of isophthalic acid and terephthalic acid is 10 to 70% as the total base acid equivalent ratio of unsaturated polyester resin.
It is desirable to blend If the blending ratio is less than 10%,
High free acid concentration causes wire discoloration, and also 70%
If it exceeds, the cured product becomes too hard and the flexibility is lowered, which is not preferable.

As the vegetable oil fatty acid (b) which is another component of the unsaturated polyester resin, there may be mentioned fatty acids such as soybean oil, linseed oil, coconut oil and tall oil or their transesterification products, which may be used alone or in combination with 2 A mixture of two or more species can be used. The blending ratio of vegetable oil fatty acid is preferably 5 to 50% with respect to the total basic acid equivalent. If the blending ratio is less than 5%, the flexibility is poor, and if it exceeds 50%, the mechanical properties are deteriorated, which is not preferable.

Examples of the polymerizable monomer (B) used in the present invention include styrene monomers, styrene derivatives, acrylic acid esters, methacrylic acid esters, various aryl esters, etc. These may be used alone or in admixture of two or more. can do. The mixing ratio of the polymerizable monomer is
It is desirable to add 200 to 400 parts by weight to 200 parts by weight of the unsaturated polyester resin (A) described above. If the mixing ratio is less than 200 parts by weight, the viscosity is high and the workability is poor, and if it exceeds 400 parts by weight, sufficient mechanical strength cannot be obtained, which is not preferable.

The impregnating resin composition of the present invention contains (A) an unsaturated polyester resin and (B) a polymerizable monomer as essential components. A leveling agent, a rust preventive, a flame retardant, a filler, a pigment and the like can be added and blended. Further, the impregnating resin composition can be mixed with a polymerization inhibitor, a curing agent, a curing accelerator and the like and cured by redox curing, ultraviolet curing, far infrared curing and the like. Examples of the polymerization inhibitor added and blended here include well-known quinones and phenol derivatives.
Examples of the curing agent include benzoyl peroxide, tertiary butyl peroxide, acetyl peroxide and other acyl peroxides, cumene peroxide, and the like, and these can be used alone or in combination of two or more. The amount of the curing agent added is 100
It is desirable to add 0.5 to 3 parts by weight to parts by weight. Examples of the curing accelerator include metal salts of naphthenic acid or octenoic acid (metal salts of cobalt, manganese, zinc, zirconium, etc.), and these may be used alone or in combination of two or more.

The impregnating resin composition of the present invention can be easily produced by blending the above-mentioned (A) unsaturated polyester resin, (B) polymerizable monomer and other components. Further, it is possible to produce an electric device by impregnating an electric device such as a motor coil with the impregnating resin composition by a dipping method, a dropping impregnation method or the like. The method is not particularly limited, and any method may be used.

[0014]

The impregnating resin composition of the present invention reduces free acid by introducing a predetermined amount of isophthalic acid and / or terephthalic acid as an acid component of the unsaturated polyester resin,
It suppresses the discoloration of the magnet wire and maintains the conventional characteristics.

[0015]

EXAMPLES The present invention will now be specifically described with reference to examples, but the present invention is not limited to these examples. In the following Examples and Comparative Examples, "part" means "part by weight".

Example 1 Soybean oil fatty acid 112 parts, isophthalic acid 49.8 parts, maleic acid
29.4 parts and 98 parts of propylene glycol were reacted at 220 ° C. to obtain an unsaturated polyester resin. Hydroquinone (0.1 part) and styrene monomer (433.8 parts) were added to this unsaturated polyester resin, mixed and diluted, and a 6% manganese naphthenate solution (0.36 part) was added to produce an impregnating resin composition.

Example 2 112 parts of linseed oil fatty acid, 49.8 parts of terephthalic acid, 29.4 parts of maleic acid and 80.6 parts of ethylene glycol were reacted at 220 ° C. to obtain an unsaturated polyester resin. Hydroquinone (0.1 part) and styrene monomer (433.8 parts) were added to this unsaturated polyester resin, mixed and diluted, and a 6% manganese naphthenate solution (0.36 part) was added to produce an impregnating resin composition.

Comparative Example Soybean oil fatty acid 112 parts, phthalic anhydride 44.4 parts, maleic acid
29.4 parts and 98 parts of propylene glycol were reacted at 220 ° C. to obtain an unsaturated polyester resin. Hydroquinone (0.1 part) and styrene monomer (433.8 parts) were added to this unsaturated polyester resin, mixed and diluted, and a 6% manganese naphthenate solution (0.36 part) was added to produce an impregnating resin composition.

1,1-Di-t-butylperoxy-3,3,5-trimethylcyclohexane was added to the impregnating resin compositions prepared in Examples 1 and 2 and Comparative Example to impregnate a transformer. A magnet wire discoloration test was conducted on the transformer, and the results were obtained. In the present invention, the magnet wire treated with the impregnating resin composition has no discoloration, and the effect of the present invention can be confirmed.

[0020]

[Table 1] * 1: A transformer (EI-60) impregnated with a resin composition for impregnation and 50 ml of distilled water are placed in a 1 l closed container at 60 ° C.
The presence or absence of discoloration of the magnet wire after the treatment for 5 days was observed and evaluated. ○: No discoloration, ×: Discoloration

[0021]

As is apparent from the above description and Table 1, the impregnating resin composition of the present invention has a small amount of free acid component and does not discolor the magnet wire, and has the conventional flexibility and electrical, mechanical and curing properties. It is a well-balanced product that also retains its characteristics. By treating with this composition, highly reliable electric equipment can be manufactured.

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Claims (2)

[Claims] 1. A total basic acid of an unsaturated polyester resin, which comprises (A) (a) isophthalic acid or / and terephthalic acid and (b) an unsaturated polyester resin containing a vegetable oil fatty acid and (B) a polymerizable monomer as essential components. Isophthalic acid and terephthalic acid in (a) above in a proportion of 10 to 70% relative to the equivalent weight, and unsaturated polyester resin 1
200 to 200 parts by weight of the above-mentioned (B) polymerizable monomer
An impregnating resin composition, which is compounded in a proportion of 400 parts by weight. 2. An unsaturated polyester resin containing (A) (a) isophthalic acid or / and terephthalic acid and (b) vegetable oil fatty acid and (B) a polymerizable monomer as essential components, and a total basic acid of the unsaturated polyester resin. Isophthalic acid and terephthalic acid in (a) above in a proportion of 10 to 70% relative to the equivalent weight, and unsaturated polyester resin 1
200 to 200 parts by weight of the above-mentioned (B) polymerizable monomer
An electric device characterized by being impregnated with a resin composition for impregnation, which is compounded in a proportion of 400 parts by weight.