JP5392535B2 - Resin composition for insulating electrical equipment and electrical equipment electrically insulated using the same - Google Patents

Description

  The present invention relates to a resin composition for electrical insulation and an electrical device electrically insulated using the same, and in a life evaluation of a twisted pair, 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. The present invention relates to an electric equipment insulating resin composition to be used and an electric equipment obtained by electric insulation treatment using the electric equipment 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.

  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 dropping amount of the resin composition for electrical equipment insulation is increased, but the resin composition for electrical equipment insulation is dripped immediately, and a satisfactory impregnation property is not obtained. As a result, a vicious cycle occurred in which the sagging resin composition for insulating electrical equipment was further adhered to the core, and the productivity was lowered.
In recent years, since the output of electric devices has increased, electric devices have been exposed to higher temperatures during operation. In particular, in the case of a rotor of a motor, the temperature during operation becomes higher and the rotational speed becomes faster, and due to the centrifugal force of the rotor, the fixing property of the electrically insulated rotor is lowered and the coil is deformed. In some cases, the rotation could not be balanced. For this reason, the resin composition for electrical equipment insulation which shows high adhesiveness at high temperature has come to be calculated | required.

JP 2000-235813 A

The object of the present invention is that even when the resin composition for insulating electrical equipment is subjected to a high temperature by preheating of the electrical equipment after the dropping treatment, the dripping from the coil is small, the impregnation property is good, and the adhesion to the core An object of the present invention is to provide a resin composition for insulating electrical equipment with a small amount and an electrical equipment obtained by electrical insulation treatment using the resin composition for insulating electrical equipment.
In particular, from an environmental standpoint, an object of the present invention is to provide a resin composition for insulating electrical equipment that can significantly reduce VOC generated during varnish treatment as compared with conventional unsaturated epoxy ester resins.
Another object of the present invention is to provide a resin composition for insulating electrical equipment that exhibits high adhesion at high temperatures in response to the recent increase in output and speed of electrical equipment.

  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 drips from the coil after the dropping treatment. It has been found that the amount of the resin composition for electrical insulation can be reduced as a result, with little impregnation and good adhesion to the core.

The present invention relates to [1] a resin composition for insulating electrical equipment having a viscosity at 80 ° C. of 10 to 500 mPa · s and a sticker fixing strength at 200 ° C. of 300 N or more.
In addition, the present invention provides [2] a heat resistant temperature of 20000 hours in the life evaluation of a twisted pair when the resin composition for insulating electrical equipment according to the above [1] is combined with an electric wire of MW30, MW35, MW73 or MW81. It is related with the resin composition for electric equipment insulation as described in said [1] which is 155 degreeC or more.
Further, the present invention provides: [3] The resin composition for insulating electrical equipment according to [1] or [2] described above, wherein (A) a polyepoxide and an α, β-unsaturated basic acid are reacted, and further unsaturated. 10 to 50 parts by mass of an unsaturated epoxy ester resin obtained by reacting a dibasic acid, and 1 to 50 parts of (B) dicyclopentenyloxyethyl methacrylate with respect to 10 to 50 parts by mass of component (A). Parts by mass, (C) tris (2-acryloyloxyethyl) isocyanurate, 0 to 30 parts by mass with respect to a total of 100 parts by mass of component (A) and component (B), (D) trifunctional or higher functional acrylate or methacrylate It is related with the resin composition for an electrical equipment insulation process which contains 10-200 mass parts with respect to a total of 100 mass parts of (A) component and (B) component.
The present invention also provides [4] an electrical insulation treatment method using the resin composition for electrical equipment insulation according to any one of [1] to [3] above, wherein the electrical insulation treatment is performed using a drip treatment method. It relates to electrical equipment.

  The resin composition for electrical equipment insulation according to the present invention sags from the coil of the resin composition for electrical insulation after the dropping treatment by defining the viscosity range of the resin composition for electrical equipment insulation at a temperature exposed at a high temperature. Less dropping, good impregnation, and less adhesion to the core. As a result, the dripping amount of the resin composition for electrical equipment insulation can be reduced, and the electrical resin insulation resin composition adhered to the core is scraped off. Can be reduced. In addition, the resin composition for insulating electrical equipment is excellent in adhesion at high temperatures, and electrical equipment insulated using the electrical composition is exposed to higher temperatures because the deformation of the coil is prevented and the rotation is balanced. It is industrially excellent, such as being compatible with high output motors.

In the present invention, the resin composition for insulating electrical equipment is not particularly limited, and examples thereof include thermosetting resins such as epoxy resins, unsaturated polyester resins, polyurethane resins, phenol resins, melamine resins, urea resins, alkyd resins, and the like. Or may be used in combination.
In addition, fillers such as silicon dioxide, aluminum nitride, and talc may be used for these electrical equipment insulating resin compositions, and the filler is not particularly limited, and may be used alone or in combination. .
Among the thermosetting resins, unsaturated epoxy ester resins are preferable. The unsaturated epoxy ester resin used in the present invention is obtained by reacting a polyepoxide with an α, β-unsaturated basic acid so that the resin acid value is 10 mg KOH / g or less, and then reacting with an unsaturated dibasic acid. The obtained resin acid value is 10 to 30 mgKOH / g.
There is no restriction | limiting in the manufacturing conditions of unsaturated epoxy ester resin, For example, it is made to react by making it react at 100 to 120 degreeC for 5 to 10 hours using a catalyst. The polyepoxide used in the present invention is a compound containing one or more epoxy groups per molecule, polyhydric alcohol, glycidyl polyether of polyhydric phenol, epoxidized fatty acid, drying oil acid, epoxy diolefin, epoxidation Examples thereof include esters of diunsaturated acids and epoxidized saturated polyesters.

Examples of the α, β-unsaturated basic 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 oxalates, quaternary ammonium salts such as tetramethylammonium chloride, trimethyldodecylbenzylammonium chloride, p-toluenesulfonic acid, etc. Mercaptans such as sulfonic acids, ethyl mercaptan and propyl mercaptan are used.
The reaction between the polyepoxide and the α, β-unsaturated basic acid is desirably performed by reacting 1.0 to 2.0 mol of the α, β-unsaturated basic acid with respect to 1.0 mol of the polyepoxide.
Furthermore, the following reaction of unsaturated epoxy ester and unsaturated dibasic acid was obtained by reacting 1.0 to 2.0 mol of α, β-unsaturated basic 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 unsaturated epoxy ester, the number of moles of unsaturated epoxy ester, α, β-unsaturated basic acid and unsaturated dibasic It is desirable that the total number of moles of acid be approximately the same.

  In addition to the component (B) dicyclopentenyloxyethyl methacrylate used in the present invention, dicyclopentanyl methacrylate may be used. (B) The usage-amount of a component shall be the range of 1-50 mass parts with respect to 10-50 mass parts of (A) component.

  As the component (C) used in the present invention, tris (2-acryloyloxyethyl) isocyanurate is used, and the amount used is 0 to 30 parts per 100 parts by mass in total of the components (A) and (B). The range is in parts by weight, and the component (C) may not be used.

The component (D) used in the present invention may be an acrylate having a trifunctional or higher acrylic group or a methacrylate having a trifunctional or higher methacrylic group.
Examples of the acrylate having a trifunctional or higher functional acrylic group include trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, dimethylolpropane tetraacrylate, pentaerythritol tetraacrylate, pentaerythritol ethoxytetraacrylate, and dipentaerythritol hexaacrylate. Can be mentioned.
Examples of the methacrylate having a trifunctional or higher methacrylic group include trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane trimethacrylate, dimethylolpropane tetramethacrylate, pentaerythritol tetramethacrylate, pentaerythritol ethoxytetramethacrylate, dipentaerythritol hexamethacrylate, and the like. Can be mentioned.
These may be used alone or in combination of a plurality of types, and the amount used is in the range of 10 to 200 parts by mass with respect to 100 parts by mass in total of the components (A) and (B). It is said.

  The resin composition for insulating electrical equipment of the present invention has a viscosity of 10 to 500 mPa · s at 80 ° C. from the viewpoint of little core contamination and good impregnation. The viscosity at 80 ° C. is preferably 20 to 100 mPa · s, and more preferably 40 to 80 mPa · s. When the viscosity at 80 ° C. is less than 10 mPa · s, the varnish dripped onto the electric device tends to sag and tends to adhere to the core, and when it exceeds 500 mPa · s, the permeability is deteriorated and the impregnation property is lowered. Tend.

In the present invention, as the resin composition for insulating electrical equipment, the viscosity at 80 ° C. is 5 to 500 mPa · s, and in addition, the adherence strength of the tracker at 200 ° C. needs to be 300 N or more.
It has excellent adhesion at high temperatures, and is used to prevent deformation of coils of electrical equipment that has been subjected to insulation treatment of electrical equipment and to balance rotation so that it can be used for high-power motors that are exposed to higher temperatures.
The adhesion strength of the tracker is measured by the method described in JIS C2103 (Testing method for varnish for electrical insulation). The test piece is a tin-plated piano wire for electric binding, and has a straight diameter of 1.2 mm, a length of 50 mm ± 1 mm and about 100 mm with no visual damage, and a paintbrush containing no coarse particles, clay, Wet abrasives such as diatomaceous earth and light magnesium oxide with water, polish the piano wire well with this, remove rust and other deposits, wash well under running water, and then use a clean cloth to remove water. After wiping and drying in a constant temperature bath at about 100 ° C., it is stored in a desiccator (containing a solid desiccant). Take two each of these piano wires, butt one end of two longer piano wires (about 100mm), center the contact with the shorter piano wire (50mm) on both sides, and top with soft copper wire 10 times each way, lightly wrap around 20 times. The undiluted sample is sufficiently applied to the unsealed joint with a brush, left at room temperature for about 30 minutes at a horizontal position, and then dried under predetermined conditions.
Then, using a tensile testing machine, the load when the gripping interval is 100 to 150 mm and pulled at a speed of 50 to 200 mm / min, and the contact of the test piece is peeled off is defined as the fixing force (N).
In the present invention, 1 AIW having a diameter of 2.0 mm was used as the enamel wire used for the measurement, and the varnish was cured at 150 ° C. for 1 hour. Then, in an atmosphere of 200 ° C., the gripping interval was measured at 125 mm and the pulling speed was 100 mm / min.
It is preferable that the straper fixing force is 300 N or more in order to cope with a high output motor. More preferably, it is 340 N or more.

  The resin composition for insulating electrical equipment 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. The After applying, impregnating or filling the resin composition for electrical equipment insulation to the electrical equipment itself or parts of the electrical equipment, the electrical equipment is usually insulated by heating at 100 to 200 ° C, preferably 120 to 150 ° C. The resin composition is cured. The heating time is usually 0.2 to 3.0 hours.

The following examples illustrate the invention. The part in the following example means a mass part.
(Production Example 1)
Synthesis of unsaturated epoxy ester resin (A-1) 376 parts of diglycidyl ether of 4,4-isopyridenediphenol (bisphenol A) (manufactured by Shell Chemical Co., EP-828, epoxy equivalent 188), 172 parts of methacrylic acid Then, 2 parts of benzyldimethylamine and 0.05 part of hydroquinone were charged into a reaction kettle and reacted at 115 ° C. for 10 hours. When the resin acid value reached 8 mgKOH / g, 5 parts of fumaric acid was charged at 115 ° C., 2 It was made to react for time, and the unsaturated epoxy ester resin (A-1) of resin acid value 20mgKOH / g was obtained.

Example 1
(A) 30 parts of unsaturated epoxy ester resin (A-1) as component, 20 parts of FA-512MT (manufactured by Hitachi Chemical Co., Ltd.) as dicyclopentenyloxyethyl methacrylate of (B), component (D) As a trifunctional or higher functional acrylate, 50 parts of trimethylolpropane triacrylate and 1.0 part of benzoyl peroxide were stirred and mixed to prepare a resin composition for electrical equipment insulation.

(Example 2)
30 parts of unsaturated epoxy ester resin (A-1) as component (A), 20 parts of FA-512MT (manufactured by Hitachi Chemical Co., Ltd.) as dicyclopentenyloxyethyl methacrylate of (B), component (C) 10 parts of FA-731A (manufactured by Hitachi Chemical Co., Ltd.) as tris (2-acryloyloxyethyl) isocyanurate, 60 parts of trimethylolpropane triacrylate as trifunctional or higher acrylate of component (D), benzoyl peroxide 0 parts was stirred and mixed to prepare a resin composition for insulating electrical equipment.

(Comparative Example 1)
40 parts of unsaturated epoxy ester resin (A-1), 60 parts of styrene, and 1.0 part of benzoyl peroxide were mixed with stirring to prepare a resin composition for insulating electrical equipment.

(Comparative Example 2)
30 parts of unsaturated epoxy ester resin (A-1), 50 parts of dicyclopentenyloxyethyl methacrylate (FA-512MT, manufactured by Hitachi Chemical Co., Ltd.) and 1.0 part of benzoyl peroxide are stirred and mixed to obtain an electric device. An insulating resin composition was prepared.

With respect to the obtained resin composition for insulating electrical equipment, the viscosity, the adhesion of the tracker, the core contamination and the impregnation property of the stator coil were examined at a predetermined atmospheric temperature. The results are shown in Table 1.
The viscosity test method was performed according to JIS C 2105.
The evaluation of the adhesion strength of the tracker, VOC, core contamination and impregnation of the stator coil was performed according to the following test methods.

(1) Adhering strength of the tracker It was measured according to the JIS C-2103 tracker method.
The enamel wire used for the measurement was 1 AIW having a diameter of 2.0 mm, and the varnish was cured at 150 ° C. for 1 hour.
(2) VOC (volatile organic compounds)
Varnish (5.0 g) was put into a metal petri dish with a diameter of 60 mm and cured at 130 ° C. for 1 hour to obtain a mass reduction rate (%) decreased during curing.
(3) Core contamination The core contamination test method uses a stator coil (diameter 200 mm, mass 10 kg) with a rotation speed of 15 revolutions / minute, and when the core surface temperature of the stator coil is 80 ° C, (1) lead at the coil end Nozzles are arranged at a total of four locations (Fig. 1) on the outer side of the wire side, (2) the inner side of the lead wire side, (3) the outer side of the lead wire side, and (4) the inner side of the lead wire side. In total, 300 ml of varnish was dripped in 20 minutes. After completion of dripping, the varnish was put into a dryer at 150 ° C. while continuing to rotate, taken out from the dryer after 1 hour, and visually checked for varnish adhering to the core. We investigated in.

(4) Impregnation of stator coil The impregnation test method is to cut the varnished stator coil core into a ring shape at half the core stack thickness by the core contamination test method. The proportion of impregnated varnish was visually evaluated.
The ratio of the varnish impregnated with respect to the voids in the slot was 70% or more, and less than 50% was insufficient.

As shown in Table 1, since the resin composition for insulating electrical equipment obtained in Examples 1 and 2 has a viscosity at 80 ° C. within an appropriate range, core contamination hardly occurs and the impregnation property is good. It is. Furthermore, the adhesive strength at high temperatures is high. Moreover, there is little VOC and it is favorable from a work environment side.
On the other hand, the resin composition for electrical insulation obtained in Comparative Example 1 has a viscosity at 80 ° C. lower than the appropriate range, and core contamination occurs, resulting in insufficient impregnation. Furthermore, the adhesive strength (adhesive force) at high temperatures is low.
Moreover, the resin composition for electrical insulation obtained in Comparative Example 2 has a low fixing strength (adhesive strength) at high temperatures.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic diagram using the stator coil for demonstrating the test method of the nozzle position of a drip process of this invention, and a core contamination, (a) is the figure seen from the front, (b) is the figure seen from the side It is.

Claims (4)

  A resin composition for electrical equipment insulation having a viscosity at 80 ° C. of 10 to 500 mPa · s and a sticker fixing strength at 200 ° C. of 300 N or more.   2. The heat resistant temperature of 20000 hours is 155 ° C. or higher in the life evaluation of the twisted pair when the resin composition for insulating electrical equipment according to claim 1 and the electric wire of MW30, MW35, MW73 or MW81 are combined. Resin composition for electrical equipment insulation.   The resin composition for insulating electrical equipment according to claim 1 or 2 is obtained by reacting (A) a polyepoxide with an α, β-unsaturated basic acid and further reacting with an unsaturated dibasic acid. 10-50 parts by mass of a saturated epoxy ester resin, 1-50 parts by mass of (B) dicyclopentenyloxyethyl methacrylate with respect to 10-50 parts by mass of component (A), (C) Tris (2- (Acryloyloxyethyl) isocyanurate is 0 to 30 parts by mass with respect to a total of 100 parts by mass of component (A) and component (B), and (D) trifunctional or higher functional acrylate or methacrylate is component (A) and component (B). A resin composition for electrical equipment insulation treatment comprising 10 to 200 parts by mass with respect to 100 parts by mass in total.   An electrical device obtained by electrical insulation treatment using a drip treatment method, wherein the electrical insulation treatment method using the resin composition for electrical equipment insulation according to any one of claims 1 to 3.

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