JP2007317633A - Resin composition for insulating electric apparatus, and electric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition for insulating an electric apparatus capable of reducing the dripping thereof from a coil after a dripping treatment, having an excellent impregnation property, hardly adhering to a core, and resultantly capable of reducing the dripping quantity thereof; and an electric apparatus composed by executing an electric insulation treatment by using the resin composition for insulating an electric apparatus. <P>SOLUTION: Viscosity at 90°C of this resin composition for insulating an electric apparatus is 10-1,000 mPa s. The resin composition for insulating an electric apparatus is formed of a reactive monomer containing unsaturated polyester, styrene and vinyltoluene. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a resin composition for insulating an electric device and an electric device, and in particular, an electric device suitably used in a method for treating an electric device such as a motor or a transformer having a heat resistant temperature of 20000 h at 155 ° C. or higher in the life evaluation of a twisted pair. The present invention relates to an insulating resin composition and an electric device obtained by performing an electric insulation treatment using the electric device insulating resin composition.

Electric devices such as motors and transformers are treated with a resin composition for insulating electric devices for the purpose of fixing or preventing rusting of iron cores and insulating or fixing coils. As resin compositions for insulating electrical equipment, unsaturated polyester resin compositions having an excellent balance of adhesion, curability, electrical insulation and the like are widely used (see, for example, Patent Document 1).
JP 2002-367432 A

  In recent years, electrical equipment has become smaller, lighter, and has higher output, so the proportion occupied by the wires in the actual machine slot (space factor) tends to increase, and the gap in the slot decreases, resulting in electrical equipment. It has become difficult to impregnate the insulating resin composition into the slot.

  In particular, in the drip treatment, even if the resin composition for insulating an electric device is dropped on the still hot coil after preheating, the temperature of the resin composition for insulating the electric device rises and drops in viscosity after dropping on the electric device. For this reason, the resin composition for insulating an electric device immediately sags, a satisfactory impregnation property cannot be obtained, and the sagging resin composition for insulating an electric device adheres to the core, so that the electric device attached to the core The work which peels off the resin composition for insulation arises, and productivity may fall.

  In addition, aiming to improve the impregnation property, the amount of the resin composition for electrical equipment insulation is increased and dropped, but the resin composition for electrical equipment insulation sags immediately and a satisfactory impregnation property cannot be obtained. As a result, a vicious cycle occurred in which the dripping resin composition for insulating electrical equipment was further adhered to the core, and the productivity was lowered.

  The object of the present invention is that the resin composition for electrical equipment insulation is exposed to a high temperature by preheating of the electrical equipment after the dropping treatment, and the viscosity is likely to drop as the temperature rises. By prescribing the viscosity range of the insulating resin composition, the resin composition for electrical equipment insulation is less likely to drip from the coil after the dropping treatment, the impregnation is good, and the adhesion to the core is small. An object of the present invention is to provide an electric device insulating resin composition capable of reducing the dripping amount of the electric device insulating resin composition and an electric device obtained by electric insulation treatment using the electric device insulating resin composition.

  As a result of intensive studies, the present inventors have prescribed the viscosity range of the resin composition for insulating electrical equipment at a temperature exposed to a high temperature, so that the resin composition for insulating electrical equipment is less likely to drip from the coil after the dripping treatment. The present inventors have found that the impregnation property is good and the adhesion to the core is small, and as a result, the dripping amount of the resin composition for electrical equipment insulation can be reduced.

The present invention relates to a resin composition for insulating electrical equipment having a viscosity at 90 ° C. of 10 to 1000 mPa · s.
Moreover, this invention relates to said resin composition for electric equipment insulation containing unsaturated polyester resin and the reactive monomer containing styrene or vinyl toluene.
Further, in the life evaluation of a twisted pair produced by using a conductive wire obtained by applying and curing the resin composition for insulating an electric device to an MW35 or MW81 electric wire, the present invention has a heat resistant temperature of 20000 h of 155 ° C. or higher. The present invention relates to a certain resin composition for insulating electrical equipment.
Moreover, this invention relates to the electric equipment formed by electrically insulating-processing by the drip processing method using the resin composition for electrical equipment insulation described.

In the resin composition for insulating electrical equipment according to the present invention, the viscosity range of the resin composition for insulating electrical equipment at a temperature exposed to a high temperature is defined as a certain range. Accordingly, the resin composition for insulating electrical equipment after the dripping treatment at the time of the insulation treatment has less dripping from the coil, good impregnation, and less adhesion to the core. As a result, the resin composition for insulating electrical equipment The amount of dripping can be reduced, and the scraping work of the resin composition for insulating electrical equipment attached to the core can be reduced.
In addition, this resin composition for insulating electrical equipment is excellent in adhesion at high temperatures, and electrical equipment that is electrically insulated using this composition is extremely excellent industrially.

  The resin composition for insulating electrical equipment of the present invention has a viscosity at 90 ° C. of 10 to 1000 mPa · s and preferably 20 to 300 mPa · s from the viewpoint of reducing core contamination and obtaining good impregnation properties. 30 to 200 mPa · s is more preferable, and 100 to 200 mPa · s is more preferable. When the viscosity at 90 ° C. is less than 10 mPa · s, the varnish dripped onto the necessary part of the electric device tends to sag and tends to adhere to other parts such as the core, and when it exceeds 1000 mPa · s, the permeability is poor. Therefore, the impregnation property tends to decrease.

  In the present invention, the resin composition for insulating electrical equipment is not particularly limited, and examples thereof include epoxy resins, unsaturated polyester resins, modified unsaturated epoxy ester resins, polyurethanes, phenol resins, melamine resins, urea resins, alkyd resins, and the like. The thing containing a thermosetting resin is mentioned. These thermosetting resins may be used alone or in combination.

  Among the various thermosetting resins described above, examples of the modified unsaturated epoxy ester resin include an epoxy compound and an α, β-unsaturated monobasic acid reacted to form an unsaturated epoxy ester resin, and then further an unsaturated acid. The thing obtained by making an anhydride react is mentioned. The epoxy compound used for the synthesis of the modified unsaturated epoxy ester resin is not particularly limited as long as it has one or more epoxy groups in one molecule, and may be used alone or in combination of two or more. For example, there are bisphenol A type epoxy resin, bisphenol F type epoxy resin, brominated bisphenol A type epoxy resin, novolac type epoxy resin and the like. In particular, those having two or more epoxy groups in one molecule are preferable.

  The α, β-unsaturated monobasic acid used for the synthesis of the modified unsaturated epoxy ester resin is not particularly limited, and may be used alone or in combination of two or more. For example, there are acrylic acid, methacrylic acid, cinnamic acid, crotonic acid and the like. The α, β-unsaturated monobasic acid is used so that the equivalent ratio of carboxyl group / epoxy group is preferably 0.5 to 1.9, more preferably 0.8 to 1.3. .

The modified unsaturated epoxy ester resin is obtained by reacting an epoxy compound with an α, β-unsaturated monobasic acid to obtain an unsaturated epoxy ester resin, and further reacting with an unsaturated acid anhydride. . Unsaturated acid anhydride is used to react with hydroxyl group of unsaturated epoxy ester resin, and as unsaturated acid anhydride, maleic anhydride, itaconic anhydride, citraconic anhydride, etc. Unsaturated dicarboxylic acid anhydrides and the like can be used.
The unsaturated acid anhydride is preferably used in a proportion corresponding to 2 to 40 mol% with respect to the epoxy group of the epoxy compound which is a raw material for synthesis of the unsaturated epoxy ester resin, and corresponds to 20 to 30 mol%. More preferably, it is used in a proportion of If the amount of the unsaturated acid anhydride used is outside this range, the storage stability of the modified unsaturated epoxy ester resin is poor and gelation tends to occur.

  In the reaction between an epoxy compound and an α, β-unsaturated monobasic acid, and the reaction between an unsaturated epoxy ester resin and an unsaturated acid anhydride, a halogen such as zinc chloride or lithium chloride is usually used as an addition reaction catalyst. , Sulfites such as dimethyl sulfite and methylphenyl sulfite, sulfoxides such as dimethyl sulfoxide, methyl sulfoxide, methylethyl sulfoxide, N, N-dimethylaniline, pyridine, triethylamine, benzyldimethylamine , Tertiary amines such as hexamethylenediamine and its basic acids or bromoacid salts, quaternary ammonium salts such as tetramethylammonium chloride, trimethyldodecylbenzylammonium chloride, sulfonic acids such as paratoluenesulfonic acid, ethyl mercaptan, propyl mercaptan Mercaptans such as are used. The compounding amount of the addition reaction catalyst is preferably 0.05 to 2 parts by weight with respect to 100 parts by weight of the total amount of the epoxy compound, α, β-unsaturated monobasic acid and unsaturated acid anhydride, and 0.1 to 1 More preferred is 0.0 part by weight.

  The reaction between the epoxy compound and the α, β-unsaturated monobasic acid, and the reaction between the obtained unsaturated epoxy ester resin and the unsaturated acid anhydride can be synthesized according to conventional methods. For example, after reacting an epoxy compound with an α, β-unsaturated monobasic acid, an unsaturated acid anhydride is added to the reaction mixture containing the synthesized unsaturated epoxy ester resin, and the unsaturated epoxy ester resin A hydroxyl group and an unsaturated acid anhydride may be reacted.

  The modified unsaturated epoxy ester resin (A) preferably has a number average molecular weight (measured by gel permeation chromatography and converted using a standard polystyrene calibration curve, the same applies hereinafter) of 500 to 5000, More preferably, it is 1000-2000. If it is less than 500, the curability and cured product properties of the resin mixture may be extremely inferior, and if it exceeds 5000, the viscosity tends to be too high and the workability tends to deteriorate.

  The thermosetting resin is preferably used together with a reactive monomer. As a reactive monomer suitable for the combination with the above-mentioned modified unsaturated epoxy ester resin, a compound having an unsaturated group in the molecule such as a vinyl monomer is usually preferable. For example, styrene, vinyl toluene, divinylbenzene, α- There are styrene derivatives such as methylstyrene, acrylic acids such as methyl acrylate and ethyl acrylate, and methacrylic acids such as methyl methacrylate and ethyl methacrylate, and styrene and vinyltoluene are preferably used. A reactive monomer may be used individually by 1 type, and may use 2 or more types together.

The resin composition for insulating electrical equipment of the present invention may further contain a fatty acid amide.
The fatty acid amide is not particularly limited, and may be used alone or in combination of two or more. The fatty acid amide may be a linear fatty acid amide or a branched fatty acid amide, and may be a saturated fatty acid amide or an unsaturated fatty acid amide. Preferred fatty acid amides include monoamides such as oleic acid amide and stearic acid amide, and bisamides such as ethylene bis stearic acid amide and ethylene bis oleic acid amide. Examples of commercially available products include T-380, T-550F, T-1700, T-650F (all manufactured by Ito Oil), Diamond KH, Diamond H, ZHH, and PXH (all manufactured by Nippon Kasei).

  When the resin composition for insulating electrical equipment of the present invention contains a modified unsaturated epoxy ester resin, a reactive monomer and a fatty acid amide, 10 to 95 parts by weight of a modified unsaturated epoxy ester resin, 10 to 95 parts by weight of a reactive monomer and It is preferable to contain 0.01-30 weight part of fatty acid amides. The amount of the modified unsaturated epoxy ester resin is more preferably 40 to 70 parts by weight, still more preferably 45 to 60 parts by weight. When the amount of the modified unsaturated epoxy ester resin is less than 10 parts by weight, the reactivity tends to be extremely lowered, and when it exceeds 95 parts by weight, the viscosity becomes extremely high and the workability tends to be lowered. The amount of the reactive monomer is more preferably 30 to 60 parts by weight, still more preferably 40 to 55 parts by weight. When the amount of the reactive monomer is less than 10 parts by weight, the viscosity tends to be extremely high and the workability tends to be lowered, and when it exceeds 95 parts by weight, the reactivity tends to be extremely lowered. The amount of fatty acid amide is more preferably 0.05 to 20 parts by weight, still more preferably 0.1 to 10 parts by weight. When the amount of the fatty acid amide (C) is less than 0.1 parts by weight, the viscosity of the resin composition for insulating electrical equipment tends to be low, and there is a tendency to cause contamination due to dripping or insufficient impregnation. There is a tendency for the impregnation property to decrease.

  You may mix | blend a hardening | curing agent with the resin composition for electric equipment insulation of this invention as needed. Although there is no restriction | limiting in particular as a hardening | curing agent, An organic peroxide is preferably used for unsaturated resins, such as unsaturated polyester resin and modified | denatured unsaturated epoxy ester resin. Examples of the organic peroxide include benzoin peroxide, tertiary butyl peroxybenzoate, methyl ethyl ketone peroxide, cyclohexanone peroxide, ditertiary butyl peroxide, dicumyl peroxide and the like.

  As addition amount of a hardening | curing agent, 0.5-3.0 weight part is preferable with respect to 100 weight part of total amounts of a thermosetting resin, a reactive monomer, and fatty acid amide, and 1.0-2.0 weight part is more. preferable.

  Moreover, a hardening accelerator and a polymerization inhibitor can also be added as needed. As the curing accelerator, for example, manganese naphthenate, lead naphthenate, cobalt naphthenate, cobalt octenoate and the like are used for unsaturated resins such as unsaturated polyester resins and modified unsaturated epoxy ester resins. As the polymerization inhibitor, for example, quinones such as hydroquinone, tertiary butyl catechol and p-benzoquinone are used.

  The addition amount of the curing accelerator is preferably 0.01 to 3.0 parts by weight, more preferably 0.2 to 2.0 parts by weight with respect to 100 parts by weight of the total amount of the thermosetting resin, reactive monomer, and fatty acid amide. preferable. The addition amount of the polymerization inhibitor is preferably 0.001 to 0.1 parts by weight, more preferably 0.004 to 0.05 parts by weight with respect to 100 parts by weight of the total amount of the thermosetting resin, reactive monomer, and fatty acid amide. preferable.

  The resin composition for insulating electrical equipment of the present invention may further contain a filler such as silicon dioxide, aluminum nitride, and talc. A filler may be used individually by 1 type, or may be used in combination of multiple. These fillers are blended mainly for the purpose of improving heat dissipation when operating electrical equipment. When used, the blending amount is the total amount of thermosetting resin, reactive monomer, and fatty acid amide. It is preferable to set it as 0.001-10 weight part per 100 weight part, and it is more preferable to set it as 0.1-5 weight part. When there are too many compounding quantities of a filler, the viscosity of the resin composition for electrical equipment insulation and the degree of fluctuation may become high, and impregnation property may fall. The filler preferably has an average particle size of 50 μm or less, more preferably 20 μm or less. In addition, as these fillers, the surface is subjected to chemical treatment using octylsilane, dimethyldichlorosilane, dimethylsilicone oil, hexamethyldisilazane, etc., and the surface is made hydrophobic filler alone or on the surface. When used in combination with an untreated filler, the dispersibility of the filler is improved, which is preferable. The hydrophobic filler preferably has a particle size of 500 nm or less.

  The resin composition for insulating electric equipment of the present invention is applied to insulation treatment of electric 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. Is done. In particular, since the resin composition for insulating electrical equipment of the present invention is also excellent in adhesion at high temperatures, this resin composition is applied to an MW35 or MW81 wire and cured, and a twisted pair is produced using the resulting conductive wire. In this case, it is possible to obtain a product having a heat resistant temperature of 20000 h at 155 ° C. or higher in the life evaluation of the twisted pair. This life evaluation is performed in accordance with UL-1446.

  Examples of a method for insulating an electric device using the resin composition for insulating an electric device of the present invention include, for example, applying, impregnating, or filling the electric device insulating resin composition to the electric device itself or parts of the electric device. Then, the resin composition for electrical equipment insulation is normally hardened by heating at 100-200 degreeC, Preferably it is 120-150 degreeC. The heating time is usually 0.2 to 3.0 hours. In particular, the resin composition for insulating electrical equipment according to the present invention is particularly suitable for drip treatment because of a small decrease in viscosity when exposed to high heat during insulation treatment.

Hereinafter, the present invention will be described by way of examples. In addition, the back part of each following material means a weight part.
Production Example 1 [Synthesis of Modified Unsaturated Epoxy Ester Resin (A-1)]
Diglycidyl ether of 4,4′-isopropylidene diphenol (manufactured by Shell Chemical Co., Ltd., trade name: EP-828, epoxy equivalent 188), 376 parts, 172 parts of methacrylic acid, 2 parts of benzyldimethylamine and 0.05 of hydroquinone Part was charged in a reaction kettle and reacted at 115 ° C. for 10 hours. When the resin acid value reached 8, 25 parts of maleic anhydride was charged and reacted at 115 ° C. for 2 hours. Cooled down. The number average molecular weight of the obtained modified unsaturated epoxy ester resin was 1450.

Example 1
50 parts of modified unsaturated epoxy ester resin (A-1), 50 parts of styrene, 5 parts of T-550F (fatty acid amide), 0.3 part of cobalt naphthenate and 1.0 part of tertiary butyl peroxybenzoate are mixed with stirring. Thus, a resin composition for insulating electrical equipment was prepared.

Example 2
50 parts of modified unsaturated epoxy ester resin (A-1), 50 parts of styrene, 2 parts of T-550F (fatty acid amide), 0.8 part of hydrophobic silicon dioxide having an average primary particle size of 500 nm or less, cobalt naphthenate 0.3 parts and 1.0 part of tertiary butyl peroxybenzoate were stirred and mixed to prepare a resin composition for electrical equipment insulation.

Comparative Example 1
50 parts of the modified unsaturated epoxy ester resin (A-1), 50 parts of styrene, 0.3 part of cobalt naphthenate and 1.0 part of tertiary butyl peroxybenzoate are mixed with stirring to prepare a resin composition for electrical equipment insulation. did.

In addition, the test method of a viscosity and a helical coil adhesive force measured according to JISC2105. The core contamination and the impregnation property of the stator coil were evaluated according to the following test methods.
(1) Viscosity JIS C 2105
(2) Helical coil adhesive strength (electric wire uses diameter 0.9mm (φ) AI / EIW)
JIS C 2105
In measuring the adhesive strength of the helical coil, the resin composition for electrical insulation was cured by heating at 130 ° C. for 1 hour.
(3) The test method for core contamination is the stator coil 1 (Φ200 mm, mass 10 kg) shown in FIGS. 1 and 2 (in FIG. 1, (a) is a schematic front view of the stator coil 1, and FIG. 2 is a schematic Y-Y cross-sectional view of the core 2 of the stator coil 1 of FIG. 1. The surface temperature of the stator coil core 2 is 90.degree. (1) outside the lead wire 4 side of the coil 3 end, (2) inside the lead wire 4 side, (3) outside the lead wire 4 side, (4) inside the lead wire 4 side. Nozzles 5 are arranged at a total of four locations (Fig. 1), and a total of 300 ml of predetermined varnish is dripped for 20 minutes. After completion of the dripping, it is put into a dryer at 150 ° C while continuing to rotate, and taken out from the dryer after 1 hour. Visual inspection of varnish adhering to the core It was.
(4) In the impregnation test method, the core 2 of the stator coil 1 varnished by the core contamination test method was cut into a ring shape at a half of the core stack thickness, and impregnated into the voids in the slot 6. The proportion of varnish was visually evaluated.
The ratio of the varnish impregnated with respect to the voids in the slot 6 was 70% or more, and less than 50% was insufficient.
(5) The heat resistant life temperature of the twisted pair was tested according to UL-1446 using an electric wire (diameter 0.9 mm (φ) AI / EIW), and the heat resistant life temperature after 20000 hours was obtained.

As shown in Table 1, since the resin composition for electrical equipment insulation obtained in Examples 1 and 2 has a viscosity at 90 ° C. within an appropriate range, the core contamination hardly occurs and the impregnation property is good. It is.
On the other hand, the resin composition for insulating electrical equipment obtained in Comparative Example 1 has a viscosity at 90 ° C. lower than the appropriate range, causing core contamination and insufficient impregnation.

(A) is a schematic front view of the stator coil used for the test method of a core contamination, (b) is the schematic side view. . FIG. 2 is a schematic YY sectional view of a core of the stator coil in FIG. 1.

Explanation of symbols

1 Stator Coil 2 Core 3 Coil 4 Lead Wire 5 Nozzle 6 Slot

Claims (4)

  A resin composition for insulating electrical equipment having a viscosity at 90 ° C. of 10 to 1000 mPa · s.   The resin composition for electrical equipment insulation according to claim 1, comprising an unsaturated polyester resin and a reactive monomer containing styrene or vinyltoluene.   The heat resistance temperature of 20000h is 155 ° C or higher in a life evaluation of a twisted pair produced using a conductive wire obtained by applying and curing the resin composition for electrical equipment insulation to an electric wire of MW35 or MW81. The resin composition for electrical equipment insulation as described.   The electrical equipment formed by using the resin composition for electrical equipment insulation in any one of Claims 1-3, and carrying out an electrical insulation process by the drip processing method.

Images