JP2014045120A - Resin composition for electric insulation, and electric device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition for electric insulation which enables the reduction in VOC produced in an electric insulation treatment step, and can achieve good adhesive force and good humidity resistance, and to provide an electric device arranged by performing an electric insulation treatment by use of the resin composition.SOLUTION: A resin composition for electric device insulation according to claim 1 is coated to an electric device, and is heated, cured, and subjected to an electric insulation treatment. In this case, the resin composition for electric device insulation has a 20% or below of weight reduction ratio of the resin composition for electric device insulation in the curing step. An electric device is obtained by being subjected to an electric insulation treatment with an electric insulation treatment method using the resin composition for electric device insulation.

Description

  The present invention relates to a resin composition for electrical insulation and an electrical device, and in the evaluation of the life of a twisted pair, the electrical insulation resin composition used in a method for treating electrical devices such as motors and transformers having a heat resistant temperature of 20,000 hours or more for 20,000 hours, And it is related with the electric equipment by which an electrical insulation process is carried out using this resin composition for electrical insulation.

  Electrical devices such as motors and transformers are treated with an electrical insulating resin composition for the purpose of fixing or preventing rusting of iron cores, insulating or fixing coils. As the resin composition for electrical insulation, unsaturated polyester resin compositions having an excellent balance of adhesion, curability, electrical insulation, economy, etc. are widely used.

Electrical devices such as motors and transformers are treated with an electrical insulating resin composition for the purpose of fixing or preventing rusting of iron cores, insulating or fixing coils.
As a resin composition for electrical insulation, from the viewpoint of improving workability during electrical insulation treatment, a resin composition that has good workability and generates a small amount of VOC (volatile organic compound) is demanded (for example, A resin composition containing styrene as a saturated epoxy ester and a crosslinkable monomer is used (see Patent Document 1).

  In recent years, since electrical devices have been reduced in size, weight, and output, an electrical insulating resin composition with higher coil adhesion has been demanded from the viewpoint of improving reliability against electromagnetic vibration. . Furthermore, from the viewpoint of improving durability, a resin composition for electrical insulation excellent in moisture and heat resistance has been demanded. In addition, from the viewpoint of economy, a general-purpose model of electrical equipment has been required to have a resin composition for electrical insulation composed of inexpensive general-purpose materials.

JP 2004-152607 A

  The object of the present invention is to reduce the VOC generated in the electrical insulation treatment process in the conventional solvent type as compared with the environment, compared with the unsaturated epoxy ester resin using only styrene as the crosslinkable monomer, It is another object of the present invention to provide a resin composition for electrical insulation that has higher coil adherability from the viewpoint of improving the reliability against electromagnetic vibration and is excellent in moisture and heat resistance from the viewpoint of improving durability.

  As a result of intensive studies, the inventors of the present invention have a low VOC generation amount, high coil adhesion, and excellent moisture and heat resistance when performing immersion treatment in electrical insulation treatment of electrical equipment using the resin composition for electrical insulation. The obtained resin composition for electrical insulation was found.

The present invention relates to (A) 30 to 60 parts by weight of an unsaturated epoxy ester resin obtained by reacting a polyepoxide with an α, β-unsaturated monobasic acid and further reacting with an unsaturated dibasic acid. B) Methacrylic acid 2 -It relates to the resin composition for electrical equipment insulation processing containing 10-30 weight part of hydroxyethyl and 20-40 weight part of (C) styrene.
The present invention relates to the above resin composition for electrical equipment insulation treatment, which has a weight reduction rate of 20% or less when cured by heating at 130 ° C. for 1 hour.
Moreover, this invention relates to the electric equipment formed by carrying out an electric insulation process by the immersion treatment method using these resin compositions for an electric equipment insulation process.

  The resin composition for insulating electrical equipment according to the present invention is a resin composition for electrical insulation that has a low VOC generation amount, high coil adhesion, and excellent moisture and heat resistance when performing immersion treatment from an environmentally friendly aspect. And the electrical equipment processed using this resin composition for electrical insulation can be provided.

  The unsaturated epoxy ester resin of the component (A) used in the present invention is, for example, a reaction between polyepoxide and an α, β-unsaturated monobasic acid, preferably having a resin acid value of 10 or less, and then unsaturated diester. An unsaturated epoxy ester resin having a resin acid value of 10 to 30 is preferably obtained by reacting a basic acid.

There is no restriction | limiting in the manufacturing conditions of unsaturated epoxy ester resin, for example, it is synthesize | combined by making it react for 5 to 10 hours at 100 to 120 degreeC using a catalyst.
The epoxide used in the present invention is a compound containing one or more epoxy groups per molecule, and is a polyhydric alcohol, a glycidyl polyether of a polyhydric phenol, an epoxidized fatty acid, a drying oil acid, an epoxy diolefin, an epoxy. Diesters of diunsaturated acids, epoxidized saturated polyesters, and the like.
Examples of the α, β-unsaturated monobasic acid include methacrylic acid, acrylic acid, crotonic acid and the like.

  Examples of the unsaturated dibasic acid include unsaturated acids such as maleic acid, maleic anhydride and fumaric acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride and the like.

  Examples of the addition catalyst include halides such as zinc chloride and lithium chloride, sulfites such as dimethyl sulfite and methylphenyl sulfite, sulfoxides such as dimethyl sulfoxide, methyl sulfoxide and methylethyl sulfoxide, N -N-dimethylaniline, pyridine, triethylamine, tertiary amines such as hexamethylenediamine and their basic acids or bromoacid salts, quaternary ammonium salts such as tetramethylammonium chloride and trimethyldodecylbenzylammonium chloride, sulfones such as paratoluenesulfonic acid Mercaptans such as acids, ethyl mercaptan and propyl mercaptan are used.

The reaction between the polyepoxide and the α, β-unsaturated monobasic acid is desirably carried out by reacting 1.0 to 2.0 mol of the α, β-unsaturated monobasic acid with respect to 1.0 mol of the polyepoxide.
Further, the reaction of the reaction product of the following polyepoxide with α, β-unsaturated monobasic acid and the unsaturated dibasic acid results in 1.0% of α, β-unsaturated monobasic acid with respect to 1.0 mol of polyepoxide. It is desirable to react 0.1 to 1.0 mole of unsaturated dibasic acid with respect to ~ 2.0 mole of reactant, and unsaturated epoxy ester (polyepoxide and α, β-unsaturated monobasic acid The total number of moles of (reactant) and the moles of α, β-unsaturated monobasic acid and unsaturated dibasic acid is preferably substantially the same.

  The resin composition for electrical insulation of the present invention is applied to insulation treatment of electrical equipment such as power transformers such as condenser motors such as air conditioner fans, electric fans and washing machines, amateurs such as electric drills, televisions, stereos and compact disc players. . After the resin composition for electrical insulation is applied, impregnated, or filled into the electrical equipment itself or parts of the electrical equipment, the electrical insulation resin is usually heated at 100 to 160 ° C., preferably 120 to 140 ° C. The composition is cured. The heating time is usually 0.5 to 3.0 hours.

  The resin composition for electrical insulation of the present invention may appropriately contain a thermosetting resin such as epoxy resin, unsaturated polyester resin, polyurethane, phenol resin, melamine resin, urea resin, alkyd resin, and silicon dioxide. Further, a filler such as aluminum nitride or talc may be contained.

  Hereinafter, the present invention will be described by way of examples. The part in the following example means a weight part.

Synthesis of unsaturated epoxy ester resin (A-1) 376 parts of diglycidyl ether of 4,4-isopyridene diphenol (manufactured by Shell Chemical, EP-828, epoxy equivalent 188), 172 parts of methacrylic acid, 2 parts of benzyldimethylamine Then, 0.05 part of hydroquinone was charged in a reaction kettle and reacted at 115 ° C. for 10 hours. When the resin acid value reached 8, 5 parts of fumaric acid was charged and reacted for 2 hours at 115 ° C. A saturated epoxy ester resin was obtained.
Resin composition for electrical insulation was prepared by stirring and mixing 45 parts by weight of unsaturated epoxy ester resin (A-1), 20 parts by weight of 2-hydroxyethyl methacrylate, 35 parts by weight of styrene, and 1.0 part of benzoyl peroxide. .

Comparative Example 1
Resin for electrical insulation by stirring and mixing 45 parts by weight of unsaturated epoxy ester resin (A-1) obtained in the same manner as in Example 1, 55 parts by weight of 2-hydroxyethyl methacrylate, and 1.0 part of benzoyl peroxide. A composition was prepared.

Comparative Example 2
Resin composition for electrical insulation was prepared by stirring and mixing 45 parts by weight of unsaturated epoxy ester resin (A-1) obtained in the same manner as in Example 1, 55 parts by weight of styrene, and 1.0 part of benzoyl peroxide. .

About each resin composition for electrical insulation obtained by the Example and the comparative example, VOC, helical coil adhesive force, volume resistivity, and the volume resistivity after a moist heat test were investigated. The results are shown in Table 1.
(1) VOC
5.0 g of a resin composition for insulating electrical equipment was put into a Φ60 mm metal petri dish and cured at 130 ° C. for 1 h to obtain a weight reduction rate (%) decreased during curing.
(2) Helical coil adhesive strength: A test was performed in accordance with JIS C 2103 using 1EIW-Aφ1.0 mm manufactured by Hitachi Cable as an enameled wire.
(3) Volume resistivity: In accordance with JIS C 2105, a predetermined resin composition is poured into a mold using a spacer having a thickness of 2 mm, cured at 80 ° C. 2 h + 100 ° C. 2 h + 130 ° C. 2 h, and a resin plate having a thickness of 2 mm Was made.
(4) Moisture and heat resistance test Using the resin plate having a thickness of 2 mm prepared in the item (3) as a test piece, it was put into a constant temperature and high humidity soda of 40 ° C. and 90% RH, taken out after 100 hours, and the adhesive strength was measured.

  As shown in Table 1, the resin composition for electrical insulation obtained in Example 1 has a low VOC and good adhesion and moisture resistance.

Claims (3)

(A) Unsaturated epoxy ester resin obtained by reacting polyepoxide with α, β-unsaturated monobasic acid and further with unsaturated dibasic acid 30-60 parts by weight (B) 2-hydroxyethyl methacrylate A resin composition for electrical equipment insulation treatment comprising 10 to 30 parts by weight and (C) 20 to 40 parts by weight of styrene. The resin composition for insulating electrical equipment according to claim 1, wherein a weight reduction rate when cured by heating at 130 ° C for 1 hour is 20% or less. An electrical device obtained by electrical insulation treatment by an immersion treatment method using the resin composition for electrical equipment insulation according to claim 1 or 2.