JP2003089710A - Unsaturated polyester resin composition for use in impregnation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an excellent resin composition for use in impregnation having improved heat releasing ability compared to a conventional resin composition (varnish E or F). SOLUTION: This unsaturated polyester resin composition for use in impregnation (varnish C or D) essentially comprises (A) 100 pts.wt. of an unsaturated polyester, (B) 5-300 pts.wt. of a reactive monomer and (C) 0.1-100 pt(s).wt. of a black pigment.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impregnating resin composition comprising an unsaturated polyester as a main component and impregnating a coil or the like. The present invention relates to an unsaturated polyester resin composition for impregnation which is particularly excellent in heat dissipation as compared with a resin composition. [0002] Conventionally, for impregnating coils such as transformers and stators, it has been general to use unsaturated polyester as a main component as an insulating varnish and styrene as a reactive monomer. These coils generate heat when energized,
This heat treatment often becomes a problem. [0003] Conventionally, in order to suppress the heat generation of the coil,
In some cases, a method of applying a black finishing varnish by brushing after treatment with an impregnated varnish to improve heat dissipation is used. However, these finishing varnishes are of the solvent type and have the disadvantage of releasing a large amount of solvent into the atmosphere. [0004] Further, since it is manufactured in a process of applying it on a material once treated with an impregnating varnish, there is a drawback that time and cost are increased due to an increase in the number of manufacturing steps. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made in view of the above circumstances. A solvent released into the atmosphere is obtained by coloring a non-solvent resin impregnated in a coil with a pigment. An object of the present invention is to provide a resin composition capable of reducing the number of manufacturing steps and the number of manufacturing steps. The present inventors have made intensive studies to achieve the above object, and as a result, have found that the above-mentioned object can be achieved by a resin composition containing an unsaturated polyester as a main component described below. The present invention has been completed. That is, the present invention comprises (A) an unsaturated polyester, (B) a reactive monomer, and (C) a black pigment as essential components, and 100 parts by weight of the unsaturated polyester (A). An unsaturated polyester resin composition for impregnation, wherein the reactive monomer of (B) is blended in a proportion of 5 to 300 parts by weight and the black pigment of (C) in a proportion of 0.1 to 100 parts by weight. Things. Hereinafter, the present invention will be described in detail. The unsaturated polyester (A) used in the present invention is obtained by adding (a) an acid component and (b) an alcohol component and reacting them. The (a) acid component used herein includes maleic acid, maleic anhydride, fumaric acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride and other unsaturated acids and phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid. ,
Saturated acids such as hexahydrophthalic acid, hexahydrophthalic anhydride, adipic acid and the like can be mentioned, and these can be used alone or in combination. (B) The alcohol component includes propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, 1,3-butanediol, neopentyl glycol, glycerin, pentaerythritol, polyether polyalcohol, tris (2
-Hydroxyethyl) isocyanurate and the like,
These can be used alone or in combination. The unsaturated polyester (A) can be modified by adding a modifying component other than the thermosetting polyester resin, if necessary. As a modifying component of the thermosetting polyester, for example, linseed oil, soybean oil,
Tall oil, petroleum resin, xylene resin, dicyclopentadiene and the like can be mentioned, and these can be used alone or in combination of two or more. The reactive monomer (B) used in the present invention includes aromatic vinyl compounds, acrylates and derivatives thereof, methacrylates and derivatives thereof, and various allyl esters. For example, styrene,
Vinyltoluene, divinylbenzene, 2,5-dimethylstyrene, 3,4,6-trimethylstyrene, p-chlorostyrene, p-methoxystyrene, diallyl phthalate, methyl methacrylate, ethyl methacrylate, methacrylic acid (2-hydroxyethyl ), Allyl methacrylate and the like. In some cases, alkyl methacrylate, tridecyl methacrylate, stearyl methacrylate, lauryl methacrylate and the like can be mentioned, and these can be used alone or in combination. The mixing ratio of the reactive monomer is 5 to 3 with respect to 100 parts by weight of the unsaturated polyester (A).
It is desirable to add 00 parts by weight. If the amount is less than 5 parts by weight, the viscosity is high and workability is impaired. If the amount exceeds 300 parts by weight, sufficient flexibility cannot be obtained. The black pigment (C) used in the present invention includes:
Examples thereof include carbon black, a composite oxide of copper, iron, and manganese, and a mixture thereof with an unsaturated polyester resin. Commercially available products include MA600 (trade name, manufactured by Mitsubishi Kasei Co., Ltd.), Dipoxide Black # 955
0 (manufactured by Dainichi Seika Kogyo Co., Ltd.) and the like, and these can be used alone or in combination. The blending ratio of the black pigment is the same as that of (A) the unsaturated polyester 100 described above.
It is desirable to mix 0.1 to 100 parts by weight with respect to parts by weight. The resin composition of the present invention comprises (A) an unsaturated polyester and (B) a reactive monomer, and (C) a black pigment as essential components. If necessary, other components such as a curing agent, a curing accelerator, a polymerization inhibitor, a filler, an antifoaming agent, and a leveling agent can be added and blended. As a curing agent, an organic peroxide, for example,
Benzoyl peroxide, tertiary butyl peroxide, methyl ethyl ketone peroxide, acyl peroxide, cumene peroxide and the like,
These can be used alone or in combination of two or more. It is desirable to add 0.5 to 3 parts by weight of the curing agent to 100 parts by weight of the resin composition. Examples of the curing accelerator include metal salts of naphthenic acid or octylic acid (metal salts of cobalt, zinc, zirconium, manganese, calcium, etc.), and these may be used alone or in combination of two or more. Can be. Examples of the polymerization inhibitor include hydroquinone, methoquinone, paratertiary butyl catechol,
Examples thereof include quinones such as pyrogallol, which can be used alone or in combination of two or more. Examples of the filler include silica, talc, calcium carbonate, alumina, aluminum hydroxide and the like, and these can be used alone or as a mixture of two or more. The resin composition of the present invention is easily prepared by blending (A) an unsaturated polyester, (B) a reactive monomer, (C) a black pigment, and other components, and uniformly stirring and mixing. be able to. The resin composition of the present invention has improved heat dissipation by adding a black pigment to a solventless resin impregnated in a coil as compared with a conventional solventless unsaturated polyester resin. The present invention provides a resin composition capable of reducing the solvent released into the atmosphere and reducing the number of manufacturing steps. Now, the present invention will be described in further detail with reference to Examples, but it should be understood that the present invention is by no means restricted to such specific Examples. Example 1 130 g of isophthalic acid and 60 of tetrahydrophthalic anhydride
g, maleic anhydride 120 g, propylene glycol 2
20 g and hydroquinone 0.03 g were added,
The reaction was carried out at -220 ° C to obtain unsaturated polyester A having an acid value of 10. To the obtained unsaturated polyester A, 0.4 g of hydroquinone and 500 g of styrene were added, and stirred and mixed until a uniform solution was obtained, whereby a curable resin B was produced. The resin B contains 20 g of carbon black,
200 g of silica was added, and manganese naphthenate and 1,1-bis (tert-butylperoxy) -3,
3,5-Trimethylcyclohexane was added and blended, followed by stirring and mixing until uniform, to produce Varnish C. Example 2 Dipoxide # 955 was added to resin B obtained in Example 1.
30 g (manufactured by Dainichi Seika Kogyo Co., Ltd.) and silica 20
0 g was further added, and manganese naphthenate and 1,1-bis (tert-butylperoxy) -3,3,5-trimethylcyclohexane were further added and blended, followed by stirring and mixing until the mixture became uniform to prepare Varnish D. Comparative Example 1 Manganese naphthenate was added to the resin B obtained in Example 1;
1,1-bis (tert-butylperoxy) -3,
Varnish E was produced by adding and blending 3,5-trimethylcyclohexane. Comparative Example 2 130 g of maleic anhydride, 210 g of isophthalic acid, 250 g of propylene glycol and 0.1 of hydroquinone
g was added and reacted at about 200 ° C. to obtain an unsaturated polyester having an acid value of 25. 400 g of styrene and 0.2 g of hydroquinone were added to the unsaturated polyester, and manganese naphthenate and 1,1-bis (tert-butylperoxy) -3,3,5-trimethylcyclohexane were added and blended to prepare Varnish F. Manufactured. The varnishes produced in Examples 1 and 2 and Comparative Examples 1 and 2 were each impregnated to produce transformers of the same size. After heating the fabricated transformer to 120 ° C,
The transition of the surface temperature of the transformer by cooling was tested, and the results are shown in FIG. In FIG. 1, the abscissa indicates the cooling time (minutes) and the ordinate indicates the transformer surface temperature (° C.). Examples 1 and 2 were compared with conventional resin compositions (varnishes E and F).
The heat dissipation properties of Varnishes C and D were improved, and the effect of the present invention could be confirmed. As is apparent from the above description and FIG. 1, the resin composition of the present invention is excellent in heat dissipation as compared with the conventional resin composition.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing transition of a surface temperature of a transformer by cooling. [Explanation of symbols]

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 4J002 CF22 DA036 DE096 DE116                       FD010 FD096 FD140 FD150                 4J027 AB02 AB06 AB07 AB08 AB15                       AB16 AB17 AB18 AB19 BA04                       BA05 BA06 BA07 CA12 CA20                       CB03 CD08                 5G305 AA12 AB23 AB36 BA09 CA12                       CD20

Claims (1)

Claims: 1. An unsaturated polyester (A), a reactive monomer (B) and a black pigment (C) are essential components, and based on 100 parts by weight of the unsaturated polyester (A). Unsaturated polyester for impregnation, wherein the reactive monomer of (B) is blended in a proportion of 5 to 300 parts by weight and the black pigment of (C) is blended in a proportion of 0.1 to 100 parts by weight. Resin composition.