JP2002348452A - Resin composition for electrical insulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition for electrical insulation in order to fix a coil of an electrical apparatus such as a motor and a transformer firmly. SOLUTION: This resin composition for electrical insulation comprises 100 parts by weight of an unsaturated polyester resin and 0.05-2.0 parts by weight of a fine inorganic filler.

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 electrical equipment insulation, and more particularly to a resin composition for electrical equipment insulation which improves the adhesion of coils for electrical equipment such as motors and transformers.

[0002]

2. Description of the Related Art Electric devices such as motors and transformers are treated with an electrically insulating resin composition for the purpose of fixing or rusting an iron core, insulating or fixing a coil, and the like. As the resin composition for electrical insulation, curable, air-dry, sticky,
2. Description of the Related Art Unsaturated polyester resin compositions excellent in balance between electrical insulation and economy are widely used.

In recent years, in order to reduce the size, weight and output of electric equipment, it is necessary to increase the space factor of windings.
For the purpose of shortening the winding process, high-speed winding has come to employ an enameled wire having a small surface tension and excellent in slipperiness. For this reason, the conventional unsaturated polyester resin has a large difference in surface tension with the surface of the enameled wire, and the unsaturated polyester resin is repelled on the surface of the enameled wire. Thus, an unsaturated polyester resin capable of adhering to an enameled wire having excellent slipperiness has been required.

[0004]

SUMMARY OF THE INVENTION In the unsaturated polyester resin resin composition for electrical insulation, an enameled wire having excellent slipperiness can be fixed to satisfy the recent required performance, and low viscosity and impregnating property can be obtained. An object of the present invention is to provide an excellent resin composition for electric insulation.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that by mixing a fine inorganic filler with an unsaturated polyester resin, an enamel having better lubricity than conventional unsaturated polyester varnishes can be obtained. A resin composition for electric insulation of an unsaturated polyester resin having good adhesion to a wire and low viscosity was found.

[0006] The present invention relates to the following. (1) A resin composition for electrical equipment insulation comprising (A) an unsaturated polyester resin and 100 parts by weight (B) 0.05 to 0.2 parts by weight of a fine inorganic filler.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The unsaturated polyester of the component (A) used in the present invention is usually an unsaturated polyester (a).
And those containing a crosslinkable monomer (b) are preferably used.

As the unsaturated polyester (a), a polybasic acid component consisting of an unsaturated polybasic acid and a saturated polybasic acid and a polyhydric alcohol component are usually dehydrated and condensed, and if necessary, a modified component is reacted. What is obtained by using is used. The reaction of the metamorphic component may be performed simultaneously with the dehydration reaction of the polybasic acid component and the polyhydric alcohol component, or after the polybasic acid component or a part of the polyhydric alcohol component is reacted with the metamorphic component, the reaction is formed. The dehydration-condensation reaction of the remaining polybasic acid component and polyhydric alcohol component may be performed by adding the product. Examples of unsaturated polybasic acids include maleic acid, maleic anhydride, fumaric acid, itaconic acid citraconic acid, unsaturated dibasic acids such as citraconic acid, and reaction derivatives such as anhydrides thereof, and the like. One or more of them can be used. Saturated basic acids include phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid,
Saturated acids such as tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydrophthalic anhydride, adipic acid, sebacic acid, reactive derivatives such as these anhydrides, soybean oil fatty acids, linseed oil fatty acids, and tall oil fatty acids And vegetable oil fatty acids.

The amount of the unsaturated polybasic acid used is preferably from 50 to 95 mol%, more preferably from 70 to 90 mol%, based on the total number of moles of the polybasic acid component. If the amount of the unsaturated polybasic acid is less than 50% by mole, the curability tends to decrease, and if it exceeds 95% by mole, the strength of the cured product tends to decrease.

Examples of the polyhydric alcohol component include dihydric alcohols such as chain dihydric alcohols such as propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, 1,3-butanediol and neopentyl glycol, and cyclopentadiol. ,
Cyclohexanediol, alicyclic diols such as hydrogenated bisphenol A, bisphenol A propylene oxide adducts, P-xylene-a, aromatic diols such as a diol, ethers such as pentaerythritol diallyl ether, trivalent or higher Polyhydric alcohols such as glycerin, trimethylolpropane, pentaerythritol and the like can be mentioned, and one or more of these can be used.

The amount of the polyhydric alcohol component used is preferably 0.7 to 1.3 mol, more preferably 1.0 to 1.2 mol, per 1 mol of the polybasic acid component. When the use amount of the polyhydric alcohol component is less than 0.7 mol or more than 1.3 mol per mol of the polybasic acid component,
Presaturated polyester does not become a polymer, and a resin composition having a sufficient strength tends not to be obtained.

As the modifying component, for example, linseed oil, soybean oil, tall oil, dehydrated castor oil, coconut oil, dicyclopentadiene, cyclopentadiene and the like are used. One or more of these can be used. The amount of the modified component used is preferably from 0 to 30% by weight of the polybasic acid component, more preferably from 15 to 30% by weight.

As the unsaturated polyester (a), those having a number average molecular weight (measured by gel permeation chromatography and converted using a standard polystyrene calibration curve) of from 500 to 2,000 are preferably used. It is more preferable to use those having an acid value of from 800 to 1200, and the acid value is preferably from 5 to 40, and more preferably from 10 to 20.

Examples of the crosslinkable monomer (b) include styrene, vinyltoluene, α-methylstyrene, tert-butylstyrene, divinylbenzene, various acrylates and / or methacrylates, various allyl esters, and various allyls. Ether and the like.
These crosslinkable monomers (b) may be used alone or in combination of two or more.

The amount of the crosslinkable monomer (b) is from 75 to 60 parts by weight based on the unsaturated polyester resin (a).
It is in the range of 40 parts by weight, more preferably in the range of 60 to 40 parts by weight, provided that the total amount of the unsaturated polyester resin (a) and the crosslinkable monomer (b) is 100 parts by weight. .

The fine inorganic filler (B) used in the present invention mainly imparts thixotropic properties to the unsaturated polyester resin and adheres the unsaturated polyester resin to the surface of the enameled wire having excellent slipperiness. For the purpose, A) The unsaturated polyester resin is preferably used in an amount of 0.05 to 0.2 part by weight, more preferably 0.2 to 1 part by weight, based on 100 parts by weight.
0 parts by weight are blended. From the viewpoint of the amount of adhesion, the larger the amount, the better. However, if the amount is large, the viscosity of the resin composition for electrical insulation tends to be high, and the impregnating property tends to decrease. From this, when the total amount of the unsaturated polyester resin, the crosslinkable monomer and the inorganic filler is 100 parts by weight, the inorganic filler is preferably not more than 2 parts by weight,
More preferably, the amount does not exceed 1 part by weight. In order to improve the adhesiveness, it is preferable to mix the inorganic filler in an amount of 0.05 part by weight or more. If the amount of the inorganic filler is less than 0.05 part by weight, thixotropic properties tend to be low, and the adhesiveness tends to be low.

As the fine inorganic filler (B), those having an average particle diameter of silicon oxide of 30 nm or less are preferable, and 12 n
m or less are more preferable.

The resin composition for insulating electrical equipment according to the present invention may further contain, if necessary, a curing agent (c) for the unsaturated polyester (a). The curing agent (C) is not particularly limited as long as it is generally used as a curing agent for an unsaturated polyester resin. For example, acyl peroxides such as benzoin peroxide and acetyl peroxide, tertiary butyl peroxide,
Hydroperoxides such as cumene hydroperoxide, ketone peroxides such as methyl ethyl ketone peroxide and cyclohexanone peroxide, dialkyl peroxides such as ditertiary butyl peroxide and dicumyl peroxide, and oxyperoxides such as tertiary butyl peroxyacetate. And so on. As the addition amount of the curing agent (C), the component (A)
(B) 0.3-5 weight part is preferable with respect to 100 weight part of components, and 0.5-2 weight part is more preferable.

Further, an accelerator and a polymerization inhibitor can be added as required. As the accelerator, for example, manganese naphthenate, lead naphthenate, cobalt naphthenate,
Cobalt octenoate or the like is used. As the polymerization inhibitor, for example, quinones such as hydroquinone, tertiary butyl catechol and P-benzoquinone are used.

The resin composition of the present invention is applied to the insulation treatment of motors such as electric tools, general-purpose motors, air conditioner fans, electric fans, washing machines, etc., and power transformers for televisions, stereos, compact disk players and the like.

[0021]

The present invention will be described below with reference to examples. The middle part in the following examples means parts by weight. Production Example 1 Synthesis of unsaturated polyester resin (A-1) 330 parts by weight of dicyclopentadiene (parts by weight, the same applies hereinafter);
230 parts of maleic anhydride and 42 parts of water were charged into a reaction vessel and reacted at 140 ° C. for 2 hours under a nitrogen gas stream.
Dicyclopentadienyl monomalate was synthesized. Next, 170 parts of ethylene glycol, 1100 parts of diethylene glycol, 750 parts of maleic anhydride, and 290 parts of isophthalic acid were charged into a reaction vessel, and 200 to
The temperature was raised to 220 ° C., and the temperature was maintained in this range to cause a dehydration condensation reaction. When the acid value reached 20, the mixture was cooled.

Example 1 50 parts of unsaturated polyester resin (A-1), styrene 5
0 parts, 0.1 parts of silicon dioxide having an average particle diameter of 12 nm, and benzoyl peroxide of 1.0% by weight based on the total amount of the unsaturated polyester resin and styrene as a curing agent are mixed by stirring and mixed. Was prepared.

Example 2 50 parts of unsaturated polyester resin (A-1), styrene 5
0 parts, 1 part of silicon dioxide having an average particle diameter of 12 nm and benzoyl peroxide of 1.0% by weight based on the total amount of unsaturated polyester resin and styrene as a curing agent are stirred and mixed to prepare a resin composition for electrical insulation. did.

Example 3 50 parts of unsaturated polyester resin (A-1), styrene 5
0 parts, 2 parts of silicon dioxide having an average particle size of 12 nm, and benzoyl peroxide of 1.0% by weight based on the total amount of the unsaturated polyester resin and styrene as a curing agent were stirred and mixed to prepare a resin composition for electrical insulation. Prepared.

Comparative Example 1 Unsaturated polyester resin (A-1) 50 parts, styrene 5
0 parts, and 1.0% by weight of benzoyl peroxide based on the total amount of the unsaturated polyester resin and styrene as a curing agent were stirred and mixed to prepare a resin composition for electrical insulation.

Comparative Example 2 50 parts of unsaturated polyester resin (A-1), styrene 5
0 parts, 3 parts of silicon dioxide having an average particle diameter of 15 nm, and benzoyl peroxide of 1.0% by weight based on the total amount of the unsaturated polyester resin and styrene as a curing agent were mixed by stirring to obtain a resin composition for electrical insulation. Prepared.

With respect to the obtained resin composition for electrical insulation,
Varnish viscosity, thixotropy, gel time, and how to apply the coating film were examined. Further, the adhesive force is such that the surface tension is 30 to 35 dyn / cm (2
3 ° C) and an enameled wire without lubricity (d)
Surface tension of 45 to 50 dyn / cm (23 ° C.)
In each case, the helical coil adhesive force was measured using φ1.0 mm 1 EIW. Table 1 shows the results.

The test methods for these characteristics are as follows. Varnish viscosity, thixotropy, gel time, adhesion of coating film Helical coil adhesion: Measured according to JIS C 2105.

[0029]

[Table 1]

From Table 1, it can be seen that the resin composition for electrical insulation according to the embodiment of the present invention is superior in slipperiness to the electrical insulation resin composition according to the comparative example by incorporating a fine inorganic filler. It can be seen that the coil has an excellent impregnating property because of its excellent adhesion to the enameled wire, little increase in viscosity, and low degree of thixotropicity.

[0031]

The resin composition for insulating electrical equipment of the present invention is
By impregnating and insulating an electric device using an enameled wire having excellent slipperiness, it becomes possible to manufacture an electric device having excellent adhesion.

Claims (1)

[Claims] (A) unsaturated polyester resin, 100
Part by weight (B) A resin composition for insulating electrical equipment, comprising 0.05 to 0.2 part by weight of a fine inorganic filler.