JP6918601B2 - Resin composition for electrical equipment and electrical equipment using it - Google Patents

Description

The present invention relates to a resin composition for an electric device and an electric device using the same.

In recent years, electric devices (rotary electric machines, etc.) are required to have a small size and high output. As the size and output of electrical equipment increases, the amount of heat generated per unit volume of electrical equipment also increases. Therefore, resin components (for example, a resin composition that is impregnated in a motor coil to form a cured product). On the other hand, higher cold and thermal impact resistance is required.

As a technique for enhancing the cold and thermal impact resistance of resin components constituting electrical equipment, Patent Document 1 describes (A) an epoxy resin, (B) a main agent containing an inorganic filler, and (C) rubber modification. Dicarboxylic acid resin, (D) curing accelerator, and (E) amine-based antioxidants without sulfur atoms, phenol-based antioxidants, organic thioic acid-based antioxidants, phobic acid-based antioxidants, and A resin composition for impregnating a coil is disclosed, which comprises a curing agent containing at least one antioxidant selected from the group consisting of wax-based antioxidants. According to Patent Document 1, a coil that is excellent in impregnation property into a coil, does not undergo phase separation, has little change in hardness with time, and is a material for forming a cured product having excellent flexibility, insulation, and crack resistance. It is said that it is possible to provide a resin composition for impregnation and a coil component obtained by heat-curing the resin composition for coil impregnation.

Japanese Unexamined Patent Publication No. 2016-210928

In the technique of Patent Document 1, modified rubber particles are added to the resin composition for coil impregnation, but when rubber particles are added to the resin composition (varnish) before curing, it is dedicated to obtain good dispersibility. Mixer is required. Further, when rubber particles are added to the resin composition, the viscosity tends to increase and the workability deteriorates. Therefore, further improvement has been desired from the viewpoint of productivity.

In view of the above circumstances, the present invention provides an unsaturated polyester resin composition having both high cold and thermal impact resistance and productivity, and an electric device using the same.

The present invention, in order to achieve the above object, provides a bi Niruesuteru resins, and vinyl monomer having at least one of a hydroxyl group and an ether group, an electric apparatus resin composition which comprises a polyrotaxane, the do. Further, the present invention provides an electrical device comprising a tree fat composition of the present invention described above.

More specific configurations of the present invention are described in the claims.

According to the present invention, it is possible to provide an unsaturated polyester resin composition having both high cold and thermal impact resistance and productivity, and an electric device using the unsaturated polyester resin composition.

Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

It is a schematic diagram which shows an example of polyrotaxane contained in the resin composition of this invention. It is sectional drawing which shows an example of the electric apparatus using the unsaturated polyester resin composition of this invention. It is a schematic diagram which enlarges the welding side coil end (before application of a resin composition) of the stator coil which constitutes the electric apparatus of FIG. It is a schematic diagram of a bifilar coil.

[Basic Thought of the Present Invention]
As a result of intensive studies to solve the above-mentioned problems, the present inventor has found an unsaturated polyester resin composition having the following composition (hereinafter, simply referred to as "resin composition"). That is, bi Niruesuteru resins (Component (A)), those containing at least one of the vinyl monomer having a hydroxyl group and an ether group (component (B)) and the polyrotaxane (C). In this resin composition, a component (B) is added to the component (A), which is a thermosetting resin, in order to dissolve the component (C) having an effect of improving cold thermal impact resistance.

The cured product of the resin composition of the present invention described above has a structure in which the component (C) is contained in the crosslinked structure formed of the component (A) and the component (B). By containing the component (C), it exhibits extremely excellent cold and thermal impact resistance. Further, since the component (B) dissolves the component (C) in the component (A), the dispersibility and viscosity of the resin composition are higher than those of the resin composition to which the rubber particles are added as in Patent Document 1 described above. It is excellent in and can improve productivity.

Further, since the component (B) dissolves the component (C) in the component (A), it is not necessary to use a volatile solvent, and it is possible to prevent the generation of voids in the cured product. As a polymer material containing a rotaxane compound, for example, Japanese Patent Application Laid-Open No. 2014-118481 discloses an elastomer containing a polyrotaxane, and a polymer solution is prepared by dissolving it in a solvent (methyl ethyl ketone). When a solvent is used in this way, the solvent may volatilize when the resin composition is cured, and as a result, voids may be generated in the cured product.

Hereinafter, the resin composition according to the present invention and the electric device using the same will be described in detail.

[Resin composition]
(1) Component (A) (thermosetting resin): The vinyl ester resin component (A) contains a vinyl ester resin as an essential component. Further, an unsaturated polyester resin may be added. The unsaturated polyester resin is not particularly limited, and for example, a resin obtained by subjecting a dibasic acid to a polyhydric alcohol in a condensation reaction can be used.

Examples of the dibasic acid used as a raw material for the unsaturated polyester resin include α, β-unsaturated dibasic acid (maleic acid, phthalic anhydride, fumaric acid, itaconic acid, itaconic anhydride, etc.) and saturated dibasic acid (maleic acid, phthalic anhydride, fumaric acid, itaconic anhydride, etc.). Phthalic anhydride, phthalic anhydride, halogenated phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydroisophthalic acid, hexahydroterephthalic acid, succinic acid, malonic acid, glutaru Acid, adipic acid, sebacic acid, 1,10-decandicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid anhydride, 4, 4'-biphenyldicarboxylic acid and dialkyl esters thereof, etc.) can be used. However, it is not particularly limited to these compounds. Only one kind of these dibasic acids and the like may be used, or two or more kinds may be mixed and used as appropriate.

Polyhydric alcohols used as raw materials for unsaturated polyester resins include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, 2-methyl-1,3-propanediol, and 1 , 3-Butandiol, Bisphenol A plus propylene oxide or ethylene oxide, Glycerin, Trimethylol propane, 1,3-Propanediol, 1,2-Cyclohexaneglycol, 1,3-Cyclohexaneglycol, 1,4-Cyclohexane Glycol, paraxylene glycol, bicyclohexyl-4,4'-diol, 2,6-decalin glycol, tris (2-hydroxyethyl) isocyanurate and the like can be used. However, it is not particularly limited to these compounds. Further, amino alcohols such as ethanolamine may be used. Only one kind of these polyhydric alcohols may be used, or two or more kinds may be mixed as appropriate.

The vinyl ester resin is synthesized by a ring-opening addition reaction of an epoxy resin and an unsaturated monobasic acid. As the epoxy compound used as a raw material for the vinyl ester resin, a compound having at least two epoxy groups in the molecule is used. Examples of such epoxy compounds include epibis-type glycidyl ether-type epoxy resins obtained by a condensation reaction between bisphenols such as bisphenol A, bisphenol F and bisphenol S and epihalohydrin, and phenols such as phenol, cresol and bisphenol. Novolak type glycidyl ether type epoxy resin obtained by the condensation reaction of novolak and epihalohydrin, which is a condensate of formalin, and glycidyl ester type epoxy resin obtained by the condensation reaction of tetrahydrophthalic acid, hexahydrophthalic acid and epihalohydrin. Includes glycidyl ether type epoxy resin obtained by condensation reaction of 4,4'-biphenol, 2,6-naphthalenediol, hydrogenated bisphenol and glycols with epihalohydrin, and condensate reaction of hydranthin or cyanuric acid with epihalohydrin. Amin glycidyl ether type epoxy resin or the like can be used. However, it is not particularly limited to these compounds. Only one kind of these epoxy compounds may be used, or two or more kinds may be mixed and used as appropriate.

As the unsaturated monobasic acid used as a raw material for the vinyl ester resin, for example, acrylic acid, methacrylic acid, crotonic acid and the like can be used. Further, a half ester such as maleic acid or itaconic acid may be used. However, it is not particularly limited to these. Only one type of these unsaturated monobasic acids may be used, or two or more types may be mixed and used as appropriate. Among these compounds, a vinyl ester resin obtained by reacting an epibis type glycidyl ether type epoxy resin with methacrylic acid is preferable from the viewpoint of heat resistance and curability. Further, from the viewpoint of crack resistance of the cured product, a non-novolac type vinyl ester resin is preferable.

The unsaturated polyester resin and the vinyl ester resin are equivalent from the viewpoint of improving the cold and thermal impact resistance, but the vinyl ester resin is more preferable from the viewpoint of hydrolysis resistance.

(2) Component (B): The vinyl monoma component (B) having at least one of a hydroxyl group and an ether group has an alkyl group or an aryl group having a hydroxyl group or a hydroxyl group in an aromatic ring such as hydroxystyrene or hydroxymethylstyrene. Styrenes, alkyl groups having an alkoxy group or an alkoxy group in the aromatic ring of styrene such as methoxystyrene and methoxymethylstyrene, styrenes having an aryl group, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, glycerol mono (Meta) acrylates having a hydroxyl group such as (meth) acrylate, (meth) acrylates having an ether group such as methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, and methoxyethoxyethyl (meth) acrylate, hydroxy Examples thereof include (meth) acrylates having a hydroxyl group such as ethoxyethyl (meth) acrylate and an ether group. Only one kind of these compounds may be used, or two or more kinds may be mixed as appropriate. Among these, (meth) acrylates are more preferable from the viewpoint of reactivity and availability.

As described above, the component (B) dissolves the component (C) (polyrotaxane) described later in the component (A). Considering the solubility of polyrotaxane, a vinyl monoma having a hydroxyl group is more preferable than a vinyl monoma having an ether group. The amount of the component (B) added is preferably at least the same as that of the component (C). If the amount of the component (B) added is smaller than that of the component (C), it becomes difficult to dissolve the component (C) in the component (A).

(3) Component (C): Polyrotaxan FIG. 1 is a schematic view showing an example of polyrotaxane contained in the resin composition of the present invention. As shown in FIG. 1, the resin composition of the present invention has a structure in which the linear molecule 101 penetrates through the openings of at least two or more cyclic compounds 100, and the linear molecule 101 is not detached. In addition, a compound having a structure having a blocking group 102 at the terminal is used as the component (C). When the component (C) has such a structure, excellent cold and thermal impact resistance can be exhibited. This structure can be confirmed by analysis by NMR (Nuclear Magnetic Resonance).

As long as the component (C) has the above-mentioned structure, the structure and type of the cyclic compound 100, the linear molecule 101 and the block group 102, the encapsulation rate of the cyclic compound, the production method and the like are not limited.

Examples of the cyclic compound 100 include cyclodextrins such as α-cyclodextrin and β-cyclodextrin, crown ethers such as 18C6 and 15C5, calixarenes and pillarenes. Examples of the linear molecule 101 include polyethylene oxide, polyethylene glycol, polypropylene glycol, polyvinyl alcohol, polyolefin and polyester. Further, the terminal block group 102 may have a size such that the linear molecule 101 does not come off, and an adamantyl group, a trityl group, or the like is used.

The amount of the component (C) added according to the present invention is preferably 0.5 parts by mass to 10 parts by mass, and further 1 part to 5 parts by mass with respect to 100 parts by mass of the resin composition including other optional components. preferable. If it is less than 0.5 parts by mass, the cold thermal impact resistance is not improved, and if it is more than 10 parts by mass, the electrical characteristics are deteriorated.

(4) Other Components The above-mentioned resin composition may be added with any other components other than the above-mentioned components (A), (B) and (C), if necessary. Examples of the optional component include (i) a radically polymerizable monomer, (ii) a polymerization initiator, (iii) a curing accelerator, (iv) a polymerization inhibitor, and (v) an adhesive strength improver.

(I) The radically polymerizable monomer is styrene, vinyltoluene, vinylnaphthalene, α-methylstyrene, vinylpyrrolidone, acrylamide, acrylonitrile, allyl alcohol, allylphenyl ether, (meth) acrylic acid ester, vinyl acetate, vinylpyrrolidone. , (Meta) acrylamide, maleic acid diester, fumaric acid diester and the like. However, it is not particularly limited to these compounds.

As the radically polymerizable monomer, preferably, styrene, vinyltoluene, and (meth) acrylic acid ester (for example, methacrylate, acrylate) can be used. Examples of the (meth) acrylic acid ester include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, and isodecyl. (Meta) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, isobornyl (meth) acrylate, methoxylated cyclotriene (Meta) acrylate, dicyclopentenyloxyethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate , Polyethylene glycol (meth) acrylate, alkyloxypolypropylene glycol (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, glycidyl (meth) acrylate, caprolactone modified tetrafurfuryl ( Meta) acrylate, ethoxycarbonylmethyl (meth) acrylate, 2-ethylhexyl carbitol acrylate, 1,4-butanediol (meth) acrylate, acrylic nitrile butadiene methacrylate and dicyclopentenyloxyethyl methacrylate, 2-methacryloyloxyethyl isocyanate, (Meta) acrylates having an isocinato group such as 2-methacryloyloxyethoxyethyl isocyanate, 2- (0- [1'methylpropylideneamino] carboxyamino) ethyl methacrylate and 2- (1'[2,4 dimethylpyrazonyl) ] Examples thereof include (meth) acrylates having an isocyanate-inducing group having a thermal potential such as carboxyamino) ethyl methacrylate. Only one kind of these compounds may be used, or two or more kinds may be mixed and used as appropriate. Preferably, (meth) acrylates having high reactivity are preferable.

(Ii) The polymerization initiators are benzoyl peroxide, lauroyl peroxide, t-butyl peroxide benzoate, t-amyl peroxide benzoate, t-amylperoxyneodecanoate, and t-butylperoxyneodecanoate. Ate, t-amylperoxyisobutyrate, di (t-butyl) peroxide, dicumylperoxide, cumenehydroperoxide, 1,1-di (t-butylperoxy) cyclohexane, 2,2-di (t) -Butyl peroxy) butane, t-butyl hydroperoxide, di (s-butyl) peroxy carbonate, methyl ethyl ketone peroxide and the like can be used. Only one kind of these compounds may be used, or two or more kinds may be mixed and used as appropriate. Among these compounds, from the viewpoint of curing temperature, compounds having a one-hour half temperature in the range of 100 ° C. to 150 ° C., such as 1,1-di (t-butylperoxy) cyclohexane, are desirable.

(Iii) Examples of the curing accelerator include metal salts of naphthenic acid or octyl acid (metal salts such as cobalt, zinc, zirconium, manganese and calcium). Only one kind of these may be used, or two or more kinds may be mixed as appropriate.

(Iv) Examples of the polymerization inhibitor include quinones such as hydroquinone, paratert-butylcatechol and pyrogallol. Only one kind of these may be used, or two or more kinds may be mixed as appropriate.

Examples of the (v) adhesive strength improving agent include p-styryltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, and the like. Only one kind of these may be used, or two or more kinds may be mixed as appropriate.

The components (A) to (C) contained in the resin composition can be confirmed by analysis by NMR or IR (Infrared Spectroscopy). The components (A) to (C) contained in the cured product after curing can also be confirmed by analysis by NMR or IR.

The resin composition of the present invention is produced by uniformly stirring and mixing the above-mentioned components (A) to (C) and other optional components in air. The resin composition of the present invention can be applied to adhesion and insulation of parts of electrical equipment. For example, it can be used for insulation and fixing of stator windings of rotary electric machines.

[Electrical equipment]
Next, an electric device using the resin composition of the present invention will be described. Hereinafter, a rotary electric machine will be described as an example of an electric device. In the following description, the "axial direction" shall refer to the direction along the rotation axis of the rotary electric machine. Further, the "circumferential direction" shall indicate a direction along the rotation direction of the rotary electric machine. The "diameter direction" shall refer to the radial direction (radial direction) when the rotation axis of the rotating electric machine is centered. The "inner circumference side" refers to the inside in the radial direction (inner diameter side), and the "outer circumference side" refers to the opposite direction, that is, the outer diameter side (outer diameter side).

FIG. 2 is a schematic cross-sectional view showing an example of an electric device using the unsaturated polyester resin composition of the present invention, and FIG. 3 is a welded side coil end (resin composition) of the stator coil constituting the electric device of FIG. It is a schematic diagram which enlarges (before coating). As shown in FIGS. 2 and 3, a stator 20 is fixed to the inner peripheral side of the housing 50. A rotor 11 is rotatably supported on the inner peripheral side of the stator 20. The housing 50 constitutes the outer cover of an electric motor, which is formed into a cylindrical shape by cutting an iron-based material such as carbon steel, casting a cast steel or an aluminum alloy, or by pressing. The housing 50 is also referred to as a frame or a frame.

A liquid-cooled jacket 130 is fixed to the outer peripheral side of the housing 50. A refrigerant passage 153 for a liquid refrigerant RF such as oil is formed between the inner peripheral wall of the liquid-cooled jacket 130 and the outer peripheral wall of the housing 50. The refrigerant passage 153 is configured to prevent liquid leakage. The liquid-cooled jacket 130 houses the bearings 144 and 145, and is also referred to as a “bearing bracket”. In the case of direct liquid cooling, the refrigerant RF passes through the refrigerant passage 153 and flows out from the refrigerant outlets 154 and 155 toward the stator 20 to cool the stator 20.

The stator 20 is provided with an anti-weld side coil end 61 and a weld side coil end 62 at both ends, and the weld side coil end 62 includes a coil end 200, a slot liner 201, a welded portion coating resin 202, and an insulating paper 203. Is provided. The configuration of the stator 20 will be described in detail later.

The rotor 11 includes a rotor core 12 and a rotating shaft 13. Similar to the stator core 21, the rotor core 12 is configured by laminating thin plates (for example, silicon steel plates). The rotating shaft 13 is fixed to the center of the rotor core 12. The rotating shaft 13 is rotatably held by bearings 144 and 145 attached to the liquid-cooled jacket 130, and rotates at a predetermined position in the stator 20 and at a position facing the stator 20. Further, the rotor 11 is provided with a permanent magnet 18 and an end ring (not shown).

To assemble the rotary electric machine, first, the stator 20 is inserted inside the housing 50 and attached to the inner peripheral wall of the housing 50, and then the rotor 11 is inserted into the stator 20. Next, the bearings 144 and 145 are fitted to the rotating shaft 13 and assembled to the liquid-cooled jacket 130.

Next, the stator 20 will be described in detail with reference to FIG. The stator 20 includes a stator core 21, a large number of slots 15 provided on the inner peripheral portion of the stator core 21, and a stator coil 60 wound around the slot 15. The stator core 21 is configured by laminating thin plates (for example, silicon steel plates). A large number of stator coils 60 are wound in slots 15 provided on the inner peripheral portion of the stator core 21.

Insulation paper 300 is arranged in an annular shape between the stator coils 60 for insulation between the stator coils 60. Insulation paper 300 is arranged in an annular shape between the welds for insulation between the welds. In addition, the welded portion is insulatingly coated by an appropriate method. As the stator coil 60, a conductor having a substantially rectangular cross section (copper wire in this embodiment) is used. By using a coil conductor having a rectangular cross section, the space factor in the slot is improved and the efficiency of the rotary electric machine is improved. A slot liner 301 is provided in each of the slots 15 to ensure electrical insulation between the stator core 21 and the stator coil 60. The slot liner 301 is formed into a B-shape or an S-shape so as to wrap a copper wire. The heat generated from the stator coil 60 is transferred to the housing 50 via the stator core 21, and is dissipated by the refrigerant RF circulating in the liquid-cooled jacket 130.

In the electric device of the present invention, the above-mentioned stator coil 60 is coated with a cured product of the resin composition for insulating the electric device of the present invention. The coating method is not particularly limited, and a dipping method, a dropping impregnation method, or the like can be applied. The resin composition applied to the stator 20 is completely cured by heating. The heating method is not particularly limited, and a hot air heating furnace, an IH (Induction Heating) heating furnace, or the like can be applied. The electrical equipment provided with the resin composition of the present invention is excellent in thermal shock resistance and productivity.

Hereinafter, the effects of the present invention will be demonstrated based on Examples.

1. 1. Preparation of Resin Compositions of Examples 1 to 5, Reference Examples 1 to 3 and Comparative Examples 1 to 7 (1.1) Reagents Below, Examples 1 to 5, Reference Examples 1 to 3 and Comparative Examples 1 to 7 Ingredients (A) (A-1 to A-3), Ingredients (B), Ingredients (C), Other Ingredients (i), (i-1) to (i-) used to prepare the resin composition of. The reagents 2) and (ii) are described below.

(A-1) Unsaturated polyester resin Unsaturated polyester resin containing isophthalic acid as a carboxylic acid component (A-2) Vinyl ester resin (bisphenol A type vinyl ester resin)
Bisphenol A glycerolate dimethacrylate (manufactured by Aldrich)
(A-3) Vinyl ester resin WP-2008 (manufactured by Hitachi Kasei Co., Ltd.)
(B-1) Vinyl monoma 2-hydroxyethyl methacrylate having a hydroxyl group (manufactured by Tokyo Chemical Industry Co., Ltd.)
(B-2) Vinyl monoma ((meth) acrylate) having an ether group
Methoxyethyl methacrylate (Tokyo Chemical Industry Co., Ltd.)
(C) Polyrotaxan Selm Superpolymer A1000 (manufactured by Advanced Soft Materials Co., Ltd.)
(I) Radical Polymerizable Monomer (i-1) Dicyclopentenyloxyethyl (meth) Acrylate (manufactured by Aldrich)
(I-2) 2- (1'[2,4 dimethylpyrazonyl] carboxyamino) ethyl methacrylate (manufactured by Showa Denko KK)
(I-3) Styrene (manufactured by Wako Pure Chemical Industries, Ltd.)
(Ii) Polymerization Initiator (ii-1) 1,1-di (t-Butyl Peroxy) Cyclohexane (manufactured by NOF CORPORATION)
(Ii-2) CT-50 (manufactured by Hitachi Kasei Co., Ltd.)
Table 1 shows the compositions of the resin compositions of Examples 1 to 5 and Reference Examples 1 to 3, and Table 2 shows the compositions of the resin compositions of Comparative Examples 1 to 6. Reference Examples 1 to 3 contain only the unsaturated polyester resin as the component (A), or both the vinyl ester resin and the unsaturated polyester resin.

2. Tests and Evaluation Results of Examples 1 to 5, Reference Examples 1 to 3 and Comparative Examples 1 to 7 A test was conducted to evaluate the cold and thermal impact resistance of the above-mentioned resin composition. FIG. 3 is a schematic view of the bifilar coil. As the bifilar coil, 1φ1 AIW enamel wire (manufactured by Hitachi Metals, Ltd.) was used. The bifilar coil was manufactured by having two enamel wires, winding the jig around a jig having a distance between fulcrums of 100 mm five times, and then twisting the coil twice. This coil was horizontally immersed in the resin compositions of Examples 1 to 5, Reference Examples 1 to 3 and Comparative Examples 1 to 7 described above, and left to stand for 15 minutes. Then, it was heated at 130 ° C. for 30 minutes using a warm air circulation type constant temperature bath. After cooling, the resin was turned upside down and impregnated with the resin for another 15 minutes, and then heated at 130 ° C. for 60 minutes to prepare a test piece.

A small thermal shock tester (product name: TSE-11-A, manufactured by ESPEC CORPORATION) was used for cold thermal shock resistance. This test piece was subjected to a 1500 cycle thermal shock test at a low temperature of -60 ° C and a high temperature of 180 ° C using TSE-11-A manufactured by ESPEC.

No cracks were observed in the test pieces prepared using the resin compositions shown in Examples 1 to 5 and Reference Examples 1 to 3 after the above-mentioned test. On the other hand, in the test pieces prepared using the resin compositions shown in Comparative Examples 1 to 7, cracks were observed in all the test pieces after the above-mentioned test.

In Comparative Examples 1 to 4 and Comparative Example 6, the component (B) and the component (C) were not added in Examples 1 to 4 and Reference Example 2, respectively. When the component (C) was not contained, cracks were generated in all of Comparative Examples 1 to 4 and Comparative Example 6 because the cold and thermal impact resistance was low.

Comparative Example 5 is the one in which the component (C) was not added in Reference Example 1. From the results of Comparative Example 5 and Reference Example 1 , it was found that even if the component (B) was added, the cold and thermal impact resistance could not be improved if the component (C) was not added.

In Comparative Example 7, the component (C) was added without adding the component (B), but the component (C) was not uniformly mixed with the component (A), and a uniform solution could not be obtained. .. As a result, it is considered that the distribution of the component (C) in the obtained cured product was not uniform and cracks were generated.

As described above, it has been demonstrated that according to the present invention, it is possible to provide an electric device insulating resin composition and an electric device capable of providing an electric device having excellent thermal shock resistance.

The present invention is not limited to the above-described examples, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to add / delete / replace a part of the configuration of the embodiment with another configuration.

For example, the electric device of the present invention has been described by taking a permanent magnet type rotary electric machine as an example, but the rotor can be applied not only to the permanent magnet type but also to the induction type, the synchronous reluctance type, the claw magnetic pole type, and the like. be. Further, although the winding method is a wave winding method, any winding method having the same characteristics can be applied. Moreover, although the explanation is given for the adduction type, it can be similarly applied to the abduction type.

100 ... Cyclic compound, 101 ... Linear molecule, 102 ... Block group,
10 ... Rotor, 11 ... Rotor, 12 ... Rotor core, 13 ... Rotor shaft, 15 ... Slot, 18 ... Permanent magnet, 20 ... Stator, 21 ... Stator core, 40 ... Coil, 50 ... Housing, 60 ... Stator coil, 61 ... Anti-welding side coil end, 62 ... Welding side coil end, 130 ... Liquid cooling jacket, 144, 145 ... Bearing, 150 ... Refrigerator (oil) storage space, 153 ... Refrigerant passage, 154,155 ... Coolant outlet, 200 ... Coil end, 201 ... Slot liner, 202 ... Welded portion coating resin, 203 ... Insulating paper, 300 ... Insulating paper, 301 ... Slot liner, RF ... Refrigerator.

Claims (9)

And bi Niruesuteru resins,
A vinyl monoma having at least one of a hydroxyl group and an ether group,
And polyrotaxane, the include including dendritic fat composition,
A resin composition for electrical equipment, wherein the amount of vinyl monoma having at least one of the hydroxyl groups and ether groups added to the resin composition is equal to or greater than the amount of polyrotaxane added . Before millet Niruesuteru tree as a fat, claim 1 electric apparatus resin composition, wherein it contains a bisphenol A type vinyl ester resin. The resin composition for electrical equipment according to claim 1, wherein the vinyl monoma having at least one of the hydroxyl group and the ether group contains (meth) acrylate. The first aspect of claim 1, wherein the polyrotaxane has a cyclic molecule having an opening, a linear molecule penetrating the opening, and a block group provided at both ends of the linear molecule. Resin composition for electrical equipment. The additive amount of polyrotaxane, prior to Bark fat composition 100 parts by weight claim 1 electric apparatus resin composition, wherein it is 0.5 parts by mass to 10 parts by mass. The resin composition for electrical equipment according to claim 1, wherein the addition amount of the vinyl monoma having at least one of the hydroxyl group and the ether group is equal to or more than the addition amount of the polyrotaxane. The resin composition for electrical equipment according to claim 1, further comprising at least one of a radically polymerizable monomer, a polymerization initiator, a curing accelerator, a polymerization inhibitor and an adhesive strength improver. An electric device comprising the resin composition for an electric device according to any one of claims 1 to 7. The electric device is a rotary electric machine having a stator and a rotor rotatably supported on the inner circumference of the stator.
The stator has a stator core, a plurality of slots provided in the stator core, and a stator coil wound around the slots.
The electric device according to claim 8, wherein the stator coil is coated with a cured product of the resin composition for electric devices.

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