WO2022239203A1 - Composition de vernis isolant, vernis isolant durci, bobine et procédé de production d'une bobine - Google Patents

Composition de vernis isolant, vernis isolant durci, bobine et procédé de production d'une bobine Download PDF

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Publication number
WO2022239203A1
WO2022239203A1 PCT/JP2021/018280 JP2021018280W WO2022239203A1 WO 2022239203 A1 WO2022239203 A1 WO 2022239203A1 JP 2021018280 W JP2021018280 W JP 2021018280W WO 2022239203 A1 WO2022239203 A1 WO 2022239203A1
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Prior art keywords
insulating varnish
coil
mass
parts
varnish composition
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PCT/JP2021/018280
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English (en)
Japanese (ja)
Inventor
文彦 細越
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2021555017A priority Critical patent/JP7046280B1/ja
Priority to CN202180095682.7A priority patent/CN117203285A/zh
Priority to PCT/JP2021/018280 priority patent/WO2022239203A1/fr
Publication of WO2022239203A1 publication Critical patent/WO2022239203A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • C08L63/10—Epoxy resins modified by unsaturated compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/06—Unsaturated polyesters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C09D163/10—Epoxy resins modified by unsaturated compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/06—Unsaturated polyesters having carbon-to-carbon unsaturation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/38—Insulated conductors or cables characterised by their form with arrangements for facilitating removal of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/06—Insulation of windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/30—Windings characterised by the insulating material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure

Definitions

  • the present disclosure relates to an insulating varnish composition, a cured insulating varnish obtained by curing this insulating varnish composition, a coil comprising this cured insulating varnish, and a method for manufacturing a coil.
  • rotating machines such as electric motors, generators, and compressors have coils formed by winding electric wires around a stator core.
  • a coil in order to ensure electrical insulation of the coil, protect the wire, and fix the wire to the stator core, self-bonding of the wire, mold resin molding, insulating varnish treatment, etc. are performed.
  • the insulating varnish treatment it is necessary to impregnate the gaps between the electric wires of the coil with the insulating varnish composition, so an insulating varnish composition containing a low-viscosity thermosetting resin is widely used.
  • the insulating varnish composition is required to impregnate the gaps between the wires of the coil.
  • the cured insulating varnish produced by heating and curing the insulating varnish composition is required to have the property of preventing dielectric breakdown due to partial discharge occurring between wires of a coil.
  • As a method for suppressing the occurrence of partial discharge between the wires of a coil it is generally considered effective to increase the thickness of the insulation coating layer of the wires and increase the distance between the wires, but both of these methods reduce the output of the rotating machine. may invite.
  • Patent Literature 1 discloses a technique for obtaining a cured insulating varnish containing air bubbles by adding a microcapsule-type foaming agent to a thermosetting resin.
  • Patent Literature 1 does not consider miniaturization of bubbles, the effect of suppressing the occurrence of partial discharge in bubbles may not be sufficient.
  • the present disclosure has been made in view of the above, and aims to obtain an insulating varnish composition that can suppress the occurrence of partial discharge in air bubbles in a cured insulating varnish.
  • the insulating varnish composition according to the present disclosure includes unsaturated polyester resins, epoxy resins, and vinyl ester resins containing high molecular weight substances having a weight average molecular weight of 2000 or more.
  • FIG. 2 is a cross-sectional view of the rotating machine according to the first embodiment cut in a direction perpendicular to the central axis, and is a partially enlarged cross-sectional view showing the stator;
  • FIG. 2 is a partially enlarged cross-sectional view schematically showing the electric wire and the cured insulating varnish according to the first embodiment;
  • the insulating varnish composition, the cured insulating varnish, the coil, and the method for manufacturing the coil according to the embodiment will be described below in detail with reference to the drawings.
  • FIG. 1 is a cross-sectional view of a rotary machine 1 taken along a central axis C according to a first embodiment.
  • a rotating machine 1 includes a stator 2 , a rotor 3 , a shaft 4 , a frame 5 and two brackets 6 .
  • the stator 2 is formed in a cylindrical shape having a central axis C. As shown in FIG.
  • the direction parallel to the central axis C is the axial direction
  • the direction perpendicular to the central axis C is the radial direction
  • the direction of rotation about the central axis C is the circumferential direction.
  • the rotor 3 is arranged inside the stator 2 .
  • a gap is provided between the stator 2 and the rotor 3 over the entire circumferential direction.
  • a shaft 4 is connected to the center of the rotor 3 .
  • the shaft 4 and the central axis C of the stator 2 are provided coaxially.
  • the rotor 3 is rotatable around the central axis C as a rotation axis.
  • the frame 5 forms an outer shell of the rotating machine 1 and accommodates the stator 2 and the rotor 3 .
  • the frame 5 is formed in a cylindrical shape that is open at both ends along the axial direction.
  • One bracket 6 is arranged so as to close an opening at one end of the frame 5 along the axial direction.
  • the other bracket 6 is arranged to block the opening at the other end of the frame 5 along the axial direction.
  • One axial end of the shaft 4 protrudes outside the frame 5 through a hole 6 a formed in one bracket 6 .
  • the stator 2 includes a stator core 7 formed by laminating a plurality of electromagnetic steel sheets, and a coil 10 formed by winding an electric wire 11 around the stator core 7 .
  • FIG. 2 is a cross-sectional view of the rotating machine 1 according to the first embodiment cut in a direction orthogonal to the central axis C, and is a partially enlarged cross-sectional view showing the stator 2.
  • the stator core 7 has a cylindrical core back 7a made of a magnetic material and teeth 7b protruding radially inward from the inner peripheral surface of the core back 7a. Although only one tooth 7b is shown in FIG. 2, a plurality of teeth 7b are actually arranged at equal angles in the circumferential direction. Slots 8 are formed between adjacent teeth 7b.
  • An insulator 9 is provided in the slot 8 .
  • the insulator 9 is arranged between the stator core 7 and the coil 10 to electrically insulate the stator core 7 and the coil 10 from each other.
  • the insulator 9 covers the surface of the core back 7a facing the slot 8 and the surface of the tooth 7b facing the slot 8.
  • An electric wire 11 is wound around the tooth 7b via an insulator 9 to form a coil 10.
  • a gap G is formed between adjacent electric wires 11 .
  • the stator 2 is not limited to the illustrated example, and may be appropriately selected from known stators and used.
  • an insulating tape may be arranged between adjacent coils 10 in each slot 8, or an interphase paper may be arranged.
  • FIG. 3 is a partially enlarged sectional view schematically showing the electric wire 11 and the cured insulating varnish 14 according to the first embodiment.
  • the electric wire 11 is an insulated wire in which a conductive wire 12 is covered with an insulating coating 13 .
  • the material of the conducting wire 12 is not particularly limited as long as it has conductivity, and is, for example, copper.
  • the material of the insulating coating 13 is not particularly limited as long as it has electrical insulation, and is, for example, polyamide-imide.
  • a hardened insulating varnish 14 is placed in the gap G between adjacent electric wires 11 .
  • the insulating varnish cured product 14 fills the gap G between the adjacent wires 11 to prevent dielectric breakdown of the wires 11 due to partial discharge occurring between the wires 11, protect the wires 11, and connect the wires 11 to the stator core 7. It has a sticking effect.
  • the cured insulating varnish 14 contains a thermosetting resin 15 and air bubbles 16 .
  • the insulating varnish cured product 14 is produced by heating and curing an insulating varnish composition. The components of the insulating varnish composition used for the cured insulating varnish 14 are described in detail below.
  • the insulating varnish composition contains a thermosetting resin 15 containing at least one of unsaturated polyester resin, epoxy resin, and vinyl ester resin containing a high molecular weight substance having a weight average molecular weight of 2000 or more, and a liquid bubble-forming component having a vapor pressure of 1 mmHg or more and less than 80 mmHg.
  • the weight average molecular weight of the thermosetting resin 15 before curing is determined from a relative average molecular weight that can be measured by a conventionally known method such as gel permeation chromatography (GPC). can be done.
  • the vapor pressure of the bubble-forming component refers to the equilibrium vapor pressure that can be measured by conventionally known methods such as static method, boiling point method, and differential scanning calorimetry (DSC) method.
  • DSC differential scanning calorimetry
  • the standard state of the gas described in this specification assumes the conditions of a standard temperature of 25° C. and a standard pressure of 100 kPa (SATP: Standard Ambient Temperature and Pressure).
  • Unsaturated polyester resin, epoxy resin, and vinyl ester resin exhibit the function of increasing impregnability of the insulating varnish composition into the gap G between the electric wires 11 before curing, and the heat resistance of the cured insulating varnish 14 after curing. , and exhibit the function of enhancing electrical insulation and adhesion to the stator core 7 .
  • the main component of the thermosetting resin 15 of the insulating varnish composition is an oligomer or polymer having a weight-average molecular weight of 2000 or more. A viscous effect occurs early. Therefore, it is possible to obtain the effect of fixing the air bubbles 16 generated by the vaporization of the air bubble-forming component inside the cured insulating varnish 14 .
  • the weight-average molecular weight is less than 2000, it takes a long time to thicken the thermosetting resin 15, so the number of air bubbles 16 in the cured insulating varnish 14 decreases and the diameter of the air bubbles 16 increases. From the viewpoint of achieving both impregnability of the insulating varnish composition and miniaturization of the air bubbles 16 in the cured insulating varnish 14, the weight average molecular weight is more preferably 5,000 or more and less than 20,000.
  • the amount of the high molecular weight material having a weight average molecular weight of 2000 or more contained in the thermosetting resin 15 is preferably 20 parts by mass or more and less than 90 parts by mass with respect to 100 parts by mass of the thermosetting resin 15 .
  • the blending amount of the high molecular weight material having a weight average molecular weight of 2000 or more is within the above range, the impregnating property of the insulating varnish composition and the occurrence of partial discharge between the electric wires 11 due to the air bubbles 16 in the insulating varnish cured product 14 are improved. It is possible to achieve both the effect of suppressing
  • the unsaturated polyester resin is composed of a main component mainly composed of an unsaturated polyester component having an average molecular weight of 2000 or more having two or more unsaturated bond sites in the molecule, and a reactive diluent added in an arbitrary ratio. Obtained by mixing.
  • the type of the unsaturated polyester component is not particularly limited as long as it can be obtained by polymerizing an unsaturated polybasic acid or its anhydride, a polyhydric alcohol, and an optional saturated polybasic acid or its anhydride. It is possible to use an appropriately selected one from among known unsaturated polyester components without using any other component.
  • unsaturated polybasic acids or anhydrides thereof include maleic anhydride, maleic acid, fumaric acid, citraconic acid, itaconic acid, and methylcyclohexene-1,2-dicarboxylic anhydride. These unsaturated polybasic acids may be used alone or in combination of two or more.
  • polyhydric alcohols examples include ethylene glycol, propylene glycol, butanediol, diethylene glycol, dipropylene glycol, triethylene glycol, pentanediol, hexanediol, and bisphenol A. These polyhydric alcohols may be used alone or in combination of two or more.
  • saturated polybasic acids or anhydrides thereof include isophthalic acid, phthalic acid, phthalic anhydride, terephthalic acid, succinic acid, adipic acid, sebacic acid, 2,6-naphthalene dicarboxylic acid, bicyclo [2.2.1 ] and heptane-2,3-dicarboxylic anhydride. These saturated polybasic acids may be used alone or in combination of two or more.
  • the reactive diluent is blended for the purpose of improving the impregnating property of the insulating varnish composition and forming a crosslinked structure, so it has a lower viscosity than the unsaturated polyester component and has one radically polymerizable group in the molecule.
  • the type of the diluent is not particularly limited as long as it is a diluent, and the diluent may be appropriately selected from known reactive diluents.
  • Reactive diluents include, for example, styrene, vinyl toluene, hydroxyethyl methacrylic acid, diethylene glycol monovinyl ether. These reactive diluents may be used alone or in combination of two or more.
  • the amount of the reactive diluent is not particularly limited, but from the viewpoint of the balance between the adhesiveness and the low viscosity of the insulating varnish composition, 40 parts by mass to 250 parts by mass with respect to 100 parts by mass of the unsaturated polyester component. parts by weight, more preferably 60 to 200 parts by weight. If the reactive diluent exceeds 250 parts by mass, the adhesiveness of the insulating varnish composition may significantly deteriorate. On the other hand, when the amount of the reactive diluent is less than 40 parts by mass, the effect of reducing the viscosity of the insulating varnish composition due to the addition of the reactive diluent may not be sufficiently obtained.
  • a polymerization initiator may be added to the unsaturated polyester resin.
  • the type of the polymerization initiator is not particularly limited as long as it is a compound that generates radicals by heating or the like and has the action of promoting the cross-linking reaction. good.
  • the polymerization initiator it is preferable to use an organic peroxide having a 1-minute half-life temperature of 180° C. or less. Examples of such organic peroxides include methyl ethyl ketone peroxide, benzoyl peroxide, dicumyl peroxide, and t-butyl peroxide. These polymerization initiators may be used alone or in combination of two or more. If an organic peroxide having a 1-minute half-life temperature higher than 180° C.
  • the amount of the polymerization initiator to be blended is not particularly limited, but is preferably 0.1 to 10 parts by mass with respect to a total of 100 parts by mass of the unsaturated polyester component and the reactive diluent, and 0.5 parts by mass. It is more preferably from 1 part by mass to 5 parts by mass. If the amount of the polymerization initiator is less than 0.1 parts by mass, the crosslink density may be low, and the strength and chemical resistance of the cured insulating varnish 14 may be lowered. On the other hand, if the blending amount of the polymerization initiator is more than 10 parts by mass, the usable life of the thermosetting resin 15 before curing may be significantly shortened.
  • Epoxy resin is obtained by mixing epoxy resin, which is the main agent, with a curing agent.
  • the type of the epoxy resin is not particularly limited as long as it has an epoxy group in the molecule, and it may be appropriately selected from known epoxy resins and used.
  • Examples of epoxy resins include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol E type epoxy resin, biphenol type epoxy resin, phenol novolac type epoxy resin, cresol novolak type epoxy resin, alicyclic epoxy resin, and aliphatic epoxy resin.
  • Examples include chain epoxy resins and glycidylamine type epoxy resins. These epoxy resins may be used alone or in combination of two or more.
  • an epoxy resin that has been self-polymerized in advance may be used.
  • the type of the curing agent is not particularly limited as long as it can cure the epoxy resin, and it may be appropriately selected from known curing agents and used.
  • curing agents include acid anhydride-based curing agents and amine-based curing agents.
  • acid anhydride curing agents include bicyclo[2.2.1]heptane-2,3-dicarboxylic anhydride, methyl-5-norbornene-2,3-dicarboxylic anhydride, methylcyclohexene-1, 2-dicarboxylic anhydrides are mentioned.
  • Amine curing agents include triethylenetetramine, 4,4'-diaminodiphenylmethane, and methylcyclohexylamine as primary and secondary amines, and N,N-benzyldimethylamine, dimethylaniline, and diaza as tertiary amines. Bicycloundecene can be mentioned. These curing agents may be used alone or in combination of two or more.
  • the amount of the acid anhydride-based curing agent is preferably 30 parts by mass to 150 parts by mass, more preferably 50 parts by mass to 100 parts by mass, per 100 parts by mass of the epoxy compound.
  • the amount of the primary and secondary amine curing agents is preferably 10 parts by mass to 50 parts by mass and 20 parts by mass to 40 parts by mass with respect to 100 parts by mass of the epoxy compound. is more preferable. Further, the amount of the tertiary amine-based curing agent is preferably 0.1 to 5 parts by mass, more preferably 0.2 to 3 parts by mass, with respect to 100 parts by mass of the epoxy compound. is more preferable. When the blending amount of each curing agent is within the range described above, it is possible to obtain a cured insulating varnish 14 having high electrical properties and mechanical properties.
  • a curing accelerator may be added to the epoxy resin.
  • a curing accelerator is a compound that has the effect of accelerating the cross-linking reaction between the epoxy compound and the curing agent.
  • the curing accelerator is not particularly limited as long as it is generally used as a curing accelerator for epoxy resins, and may be appropriately selected from known curing accelerators and used.
  • the curing accelerator for example, imidazole-based curing accelerators and tertiary amine-based curing accelerators are preferable. These curing accelerators may be used alone or in combination of two or more.
  • a vinyl ester resin is obtained by mixing a main component mainly composed of a vinyl ester component with an average molecular weight of 2000 or more, which has unsaturated bond sites at both ends of the molecule, and a reactive diluent.
  • the vinyl ester component is not particularly limited as long as it can be obtained by an addition reaction between an arbitrary epoxy resin and an unsaturated carboxylic acid, and can be appropriately selected from known vinyl ester resins. good.
  • the structure of the epoxy resin used as the raw material of the vinyl ester resin is not particularly limited as long as it has at least two epoxy groups in the molecule.
  • examples of such epoxy resins include epoxy resins having skeletons such as bisphenol A, bisphenol F, cresol novolac, and phenol novolac, which are described in the section on epoxy resins. These epoxy resins may be used alone or in combination of two or more. Moreover, in order to make the average molecular weight of the resin component before curing 2000 or more, an epoxy resin that has been self-polymerized in advance may be used.
  • the structure of the unsaturated carboxylic acid is not particularly limited as long as it has one unsaturated bond site and a carboxyl group in the molecule at the same time.
  • unsaturated carboxylic acids include acrylic acid and methacrylic acid. These unsaturated carboxylic acids may be used alone or in combination of two or more.
  • an unsaturated carboxylic acid obtained by addition reaction of acrylic acid with an epoxy compound it is possible to use an unsaturated carboxylic acid obtained by addition reaction of acrylic acid with an epoxy compound. preferable.
  • the compounds described in the unsaturated polyester resin section can be used with the same composition.
  • a polymerization initiator may be added to the vinyl ester resin.
  • the compounds described in the section of the unsaturated polyester resin can be used in the same composition.
  • the bubble-forming component is a liquid with a vapor pressure of 1 mmHg or more and less than 80 mmHg in the standard gas state.
  • the bubble-forming component is sequentially vaporized with the curing reaction of the thermosetting resin 15 to form closed cells in the cured insulating varnish 14, and then the bubble-forming component evaporates to prevent the liquid from remaining in the cured insulating varnish 14 .
  • a liquid having a vapor pressure of 80 mmHg or higher is used as the bubble-forming component, the gasification of the bubble-forming component progresses before the curing of the thermosetting resin 15 starts. cause an increase in diameter.
  • the bubble-forming component when a liquid having a vapor pressure of less than 1 mmHg is used as the bubble-forming component, the bubble-forming component does not vaporize even at around the highest temperature of the curing reaction of the thermosetting resin 15 . cannot be formed.
  • the bubble-forming component should be a liquid having a vapor pressure of 5 mmHg or more and less than 40 mmHg in the standard gas state. is more preferred.
  • the type of the bubble-forming component is not particularly limited as long as it does not interfere with the curing reaction of the thermosetting resin 15, and may be appropriately selected from known bubble-forming components.
  • Hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, alcohol-based solvents, and amide-based solvents are suitable as the bubble-forming component, for example.
  • Hydrocarbon solvents include, for example, normal heptane, toluene, xylene, and cyclohexane.
  • Ketone solvents include, for example, methyl isobutyl ketone, diisobutyl ketone, cyclopentanone, and cyclohexanone.
  • ester solvents include butyl acetate and ethylene glycol monomethyl ether acetate.
  • alcoholic solvents include propanol, butanol, and diethylene glycol.
  • amide solvents include N,N-dimethylformamide and N,N-dimethylacetamide.
  • the normal boiling point of the bubble-forming component is about the same as the 1-minute half-life temperature of the polymerization initiator added to the thermosetting resin 15 in order to simultaneously proceed with the vaporization of the bubble-forming component and the curing of the thermosetting resin 15. is preferred.
  • the amount of the bubble-forming component to be added is preferably 10 to 50 parts by mass, more preferably 20 to 40 parts by mass, with respect to 100 parts by mass as the total amount of the thermosetting resin component and the reactive diluent. It is more preferable to have If the air bubble-forming component is less than 10 parts by mass, the vaporization amount is small and a sufficient number of air bubbles 16 cannot be formed in the cured insulating varnish 14 . On the other hand, when the air bubble-forming component is more than 50 parts by mass, the strength and toughness of the cured insulating varnish 14 tend to decrease.
  • the insulating varnish composition contains a flame retardant, a flame retardant aid, a reinforcing agent, an antioxidant, a light stabilizer, an antistatic agent, a foaming nucleating agent, an antifoaming agent, an interface
  • Known additives such as activators, glass fibers, ceramic fibers, carbon fibers, stabilizers and colorants may be incorporated. When these additives are added, the effect of improving the heat resistance, mechanical strength, etc. of the insulating varnish composition can be obtained.
  • the above additives may be used alone, or two or more of them may be mixed and used.
  • a method of manufacturing the coil 10 includes a mixing process, a preheating process, an air cooling process, an impregnation process, a drip removal process, and a curing and drying process. It should be noted that these steps are examples and are not intended to limit the method of manufacturing the coil 10 .
  • thermosetting resin 15 containing at least one resin selected from unsaturated polyester resins containing high molecular weight substances having a weight average molecular weight of 2000 or more, epoxy resins and vinyl ester resins, and vapor in the standard gas state.
  • This is a step of mixing a liquid foam-forming component with a pressure of 1 mmHg or more and less than 80 mmHg and various additives.
  • the mixing method is not particularly limited, and may be appropriately selected from known mixing methods. For example, a machine such as a stirrer may be used to uniformly mix the thermosetting resin 15, the bubble forming component, and various additives.
  • the mixing step results in an insulating varnish composition.
  • the preheating step is a step of heating the coil 10 before impregnation shown in FIG. 2 at a predetermined temperature.
  • the air-cooling step is a step of cooling the coil 10 heated in the preheating step to a predetermined temperature in order to suppress the temperature rise of the insulating varnish composition in the impregnating step.
  • the impregnation step is a step of impregnating the coil 10 cooled in the air cooling step with the insulating varnish composition.
  • a method for impregnating the insulating varnish composition is not particularly limited, and may be appropriately selected from known methods. Examples of the method for impregnating the insulating varnish composition include an immersion method (dipping method) in which the coil 10 is immersed in an impregnation tank containing the insulating varnish composition, and a drip impregnation method in which the insulating varnish composition is dripped onto the coil 10 (dripping method). law). If a drop impregnation method is used, the coil 10 may be preheated prior to beginning the impregnation process. In addition, the impregnation of the insulating varnish composition into the coil 10 can be divided into multiple times by either the dipping method or the dripping impregnation method.
  • the drip removal process is a process for dripping unnecessary insulating varnish composition adhering to the side surfaces of the coil 10 during the impregnation process.
  • the curing and drying process is a process of heating and curing the insulating varnish composition with which the coil 10 is impregnated.
  • the thermosetting resin 15 is cured and the bubble-forming component is vaporized to form a cured insulating varnish 14 containing fine bubbles 16 shown in FIG.
  • the insulating varnish cured product 14 adheres to the coil 10 and fills the gap G between the adjacent electric wires 11 . Thereby, the coil 10 with electrical insulation is obtained.
  • a method for curing the insulating varnish composition is not particularly limited, and may be appropriately selected from known methods.
  • the insulating varnish composition may be cured by heating using a closed curing furnace, a tunnel furnace capable of continuous curing, an electric heating facility, or the like.
  • the heating temperature of the insulating varnish composition is not particularly limited, but is generally 80°C to 200°C, preferably 130°C to 180°C. If the heating temperature of the insulating varnish composition is less than 80°C, curing of the insulating varnish composition may be insufficient. In addition, when the heating temperature of the insulating varnish composition is higher than 200 ° C., the possibility of deterioration and decomposition of the insulating varnish, the interphase paper, the insulator 9, etc., which are the resin parts that electrically insulate the coil 10, increases. .
  • the curing speed of the insulating varnish composition and the amount of the insulating varnish composition adhered to the coil 10 differ depending on the composition of the insulating varnish composition. Therefore, the heating time of the insulating varnish composition may be appropriately set according to the composition of the insulating varnish composition, and is generally 5 minutes to 6 hours. , preferably 20 minutes to 4 hours, more preferably 30 minutes to 2 hours.
  • the coil 10 with sufficient electrical insulation can be obtained.
  • the coil 10 is impregnated with the insulating varnish composition, and the insulating varnish composition is cured by heating at 130 ° C. to 180 ° C. for 5 minutes to 2 hours to form a coil with the insulating varnish cured product 14 containing fine bubbles 16. Since the gap G between the wires 11 of 10 can be filled, the effect of suppressing the occurrence of partial discharge between the adjacent wires 11, the heat resistance of the coil 10, and the reinforcing performance of the coil 10 can be improved.
  • all the air bubbles 16 contained in the cured insulating varnish 14 are preferably independent air bubbles.
  • the maximum bubble diameter is preferably 10 ⁇ m or less, and more preferably 5 ⁇ m or less.
  • the electrical properties, particularly the effect of suppressing the occurrence of partial discharge in the bubbles 16 is enhanced.
  • the minimum diameter of the air bubbles 16 is not particularly limited, it is preferably 0.1 ⁇ m or more.
  • the size of the air bubbles 16 can be measured by observing the cross section of the cured insulating varnish 14 with a scanning electron microscope (SEM).
  • the diameter of each of ten arbitrarily selected bubbles 16 is measured, and the diameter of each bubble is measured.
  • the cross-sectional shape of the bubble 16 may be circular, elliptical, or rectangular, for example.
  • the diameter of the circle is the diameter of the bubble.
  • the diameter is the major axis of the ellipse.
  • the length of the line connecting the diagonal corners of the rectangle is taken as the diameter of the bubble.
  • the insulating varnish composition that is the base of the insulating varnish cured product 14 is at least one of unsaturated polyester resin, epoxy resin and vinyl ester resin containing a high molecular weight substance having a weight average molecular weight of 2000 or more. It comprises a thermosetting resin 15 containing a resin, and a liquid bubble-forming component having a vapor pressure of 1 mmHg or more and less than 80 mmHg in a gas standard state.
  • the relative dielectric constant of the cured insulating varnish 14 can be reduced, the partial discharge inception voltage of the cured insulating varnish 14 can be increased, and the occurrence of partial discharge between adjacent electric wires 11 can be suppressed.
  • the air bubbles 16 contained in the cured insulating varnish 14 can be made finer, the occurrence of partial discharge in the air bubbles 16 in the cured insulating varnish 14 can be suppressed.
  • the bubble-forming component is a liquid, it is possible to enhance the ability of the coil 10 to be impregnated with the insulating varnish composition.
  • thermosetting resin 15 contains a polymerization initiator having a one-minute half-life temperature of 180° C. or less, so that the bubbles 16 can be formed at a temperature of 200° C. or less, which is suitable for the curing conditions of the insulating varnish composition. Insulating varnish cured product 14 containing can be produced.
  • the bubble-forming component is a liquid containing at least one of a hydrocarbon solvent, a ketone solvent, an ester solvent, an alcohol solvent, a phenol solvent, and an amide solvent. While facilitating the formation of air bubbles 16 during curing of the composition, the air bubbles 16 can be made finer.
  • the average diameter of the air bubbles 16 contained in the cured insulating varnish 14 is within the range of 0.1 ⁇ m to 10 ⁇ m.
  • the effect of reducing the dielectric constant of the object 14 can be compatible. Therefore, it is possible to cope with an increase in the current supplied to the coil 10 as the output of the coil 10 is improved.
  • the insulating varnish composition of the present disclosure was used for the insulation of the coil 10 of the rotating machine 1.
  • a varnish composition may also be used.
  • Unsaturated polyester resin Unsaturated polyester resin A: Unsaturated polyester resin prepared by condensation polymerization of 30 parts by mass of maleic acid, 20 parts by mass of isophthalic acid and 50 parts by mass of propylene glycol by a known method so as to have a polymerization average molecular weight of about 5000.
  • Polyester resin B Unsaturated polyester resin prepared by condensation polymerization of 30 parts by mass of maleic acid, 20 parts by mass of isophthalic acid and 50 parts by mass of propylene glycol by a known method so as to have a polymerization average molecular weight of about 8000
  • Unsaturated polyester resin C Unsaturated polyester resin prepared by subjecting 30 parts by mass of maleic acid, 20 parts by mass of isophthalic acid, and 50 parts by mass of propylene glycol to condensation polymerization by a known method so as to have a polymerization average molecular weight of about 2000
  • Unsaturated polyester resin D Unsaturated polyester resin prepared by condensation polymerization of 30 parts by mass of maleic acid, 20 parts by mass of isophthalic acid and 50 parts by mass of propylene glycol by a known method so as to have a polymerization average molecular weight of about 1000
  • Reactive diluent Styrene Polymerization initiation Agent: benzoyl peroxide
  • Epoxy resin A linear epoxy resin prepared by alternately copolymerizing bisphenol A diglycidyl ether (manufactured by Mitsubishi Chemical Corporation: jER828) and bisphenol A by a known method so as to have a polymerization average molecular weight of about 5000
  • Curing agent Bicyclo [2.2.1] Heptane-2,3-dicarboxylic anhydride
  • Curing accelerator 2-ethyl-4-methylimidazole
  • Vinyl ester component Bisphenol A diglycidyl ether (manufactured by Mitsubishi Chemical Corporation: jER828) and bisphenol A are alternately copolymerized by a known method, and the ends are modified with methacrylic acid so that the polymerization average molecular weight is about 5000.
  • Bisphenol A type vinyl ester resin prepared in Reactive diluent Styrene Polymerization initiator: Benzoyl peroxide
  • Example 1 By uniformly mixing 100 parts by mass of unsaturated polyester resin A, 80 parts by mass of a reactive diluent, 2 parts by mass of a polymerization initiator, and 50 parts by mass of 2-propanol, the insulating varnish composition according to Example 1 got
  • Example 2 By uniformly mixing 100 parts by mass of unsaturated polyester resin A, 80 parts by mass of reactive diluent, 2 parts by mass of polymerization initiator, and 50 parts by mass of methyl isobutyl ketone, the insulating varnish composition according to Example 2 was prepared. got
  • Example 3 An insulating varnish composition according to Example 3 was obtained by uniformly mixing 100 parts by mass of unsaturated polyester resin A, 80 parts by mass of a reactive diluent, 2 parts by mass of a polymerization initiator, and 50 parts by mass of xylene. rice field.
  • Example 4 An insulating varnish composition according to Example 4 was obtained by uniformly mixing 100 parts by mass of unsaturated polyester resin A, 80 parts by mass of a reactive diluent, 2 parts by mass of a polymerization initiator, and 50 parts by mass of cyclohexanone. rice field.
  • Example 5 An insulating varnish composition according to Example 5 was obtained by uniformly mixing 100 parts by mass of the unsaturated polyester resin B, 80 parts by mass of the reactive diluent, 2 parts by mass of the polymerization initiator, and 50 parts by mass of xylene. rice field.
  • Example 6 An insulating varnish composition according to Example 6 was obtained by uniformly mixing 100 parts by mass of unsaturated polyester resin C, 80 parts by mass of a reactive diluent, 2 parts by mass of a polymerization initiator, and 50 parts by mass of xylene. rice field.
  • Example 7 An insulating varnish composition according to Example 7 was obtained by uniformly mixing 100 parts by mass of an epoxy compound, 80 parts by mass of a curing agent, 2 parts by mass of a curing accelerator, and 50 parts by mass of xylene.
  • Example 8 An insulating varnish composition according to Example 8 was obtained by uniformly mixing 100 parts by mass of a vinyl ester component, 80 parts by mass of a reactive diluent, 2 parts by mass of a polymerization initiator, and 50 parts by mass of xylene. .
  • Comparative example 1 An insulating varnish composition according to Comparative Example 1 was obtained by uniformly mixing 100 parts by mass of unsaturated polyester resin A, 80 parts by mass of a reactive diluent, 2 parts by mass of a polymerization initiator, and 50 parts by mass of tetrahydrofuran. rice field.
  • Comparative example 2 By uniformly mixing 100 parts by mass of the unsaturated polyester resin A, 80 parts by mass of the reactive diluent, 2 parts by mass of the polymerization initiator, and 50 parts by mass of ethyl acetate, the insulating varnish composition according to Comparative Example 2 was prepared. Obtained.
  • Comparative Example 4 By uniformly mixing 100 parts by mass of the unsaturated polyester resin A, 80 parts by mass of the reactive diluent, 2 parts by mass of the polymerization initiator, and 50 parts by mass of ethylene glycol, the insulating varnish composition according to Comparative Example 4 was prepared. Obtained.
  • Comparative Example 5 An insulating varnish composition according to Comparative Example 5 was obtained by uniformly mixing 100 parts by mass of unsaturated polyester resin D, 80 parts by mass of a reactive diluent, 2 parts by mass of a polymerization initiator, and 50 parts by mass of xylene. rice field.
  • the dielectric constant of the cured insulating varnish was calculated by sandwiching the cured insulating varnish between two flat electrodes and measuring the capacitance. A dielectric constant obtained under the conditions of a temperature of 25° C. and a frequency of 1 kHz was evaluated as good when it was 3.0 or less, and as unsatisfactory when it was higher than 3.0.
  • the weight average molecular weight contained in the thermosetting resin is 2000 or more, and the vapor pressure of the air bubble-forming component gas under standard conditions is in the range of 4 mmHg to 40 mmHg. No. 8 was good in the evaluation items of the presence or absence of microbubbles contained in the cured insulating varnish and the dielectric constant.
  • Comparative Examples 1 to 4 since the vapor pressure of the gas of the bubble-forming component in the standard state was outside the range of 1 mmHg to 80 mmHg, fine bubbles could not be formed in the insulating varnish cured product, and the insulating varnish The effect of lowering the dielectric constant of the cured product was not sufficiently obtained.
  • Comparative Example 5 since the weight average molecular weight contained in the thermosetting resin was 1000, an increase in cell diameter in the cured insulating varnish was confirmed.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Power Engineering (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Insulating Materials (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

Cette composition de vernis isolant comprend : une résine thermodurcissable (15) qui contient au moins une résine qui est choisie parmi une résine époxy, une résine d'ester de vinyle et une résine de polyester insaturé qui contient un matériau de poids moléculaire élevé ayant un poids moléculaire moyen en poids de 2 000 ou plus; et un composant de formation de bulles d'air qui est à l'état liquide, et dont un gaz a une pression de vapeur de 1 mmHg ou plus mais inférieure à 80 mmHg dans un état standard.
PCT/JP2021/018280 2021-05-13 2021-05-13 Composition de vernis isolant, vernis isolant durci, bobine et procédé de production d'une bobine WO2022239203A1 (fr)

Priority Applications (3)

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JP2021555017A JP7046280B1 (ja) 2021-05-13 2021-05-13 絶縁ワニス組成物、絶縁ワニス硬化物、コイルおよびコイルの製造方法
CN202180095682.7A CN117203285A (zh) 2021-05-13 2021-05-13 绝缘清漆组合物、绝缘清漆固化物、线圈及线圈的制造方法
PCT/JP2021/018280 WO2022239203A1 (fr) 2021-05-13 2021-05-13 Composition de vernis isolant, vernis isolant durci, bobine et procédé de production d'une bobine

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009102586A (ja) * 2007-10-25 2009-05-14 Kyocera Chemical Corp 熱硬化性樹脂組成物、硬化物および高熱伝導コイル
WO2016072425A1 (fr) * 2014-11-07 2016-05-12 古河電気工業株式会社 Fil isolant et machine électrique rotative
JP2017048329A (ja) * 2015-09-03 2017-03-09 日立化成株式会社 不飽和ポリエステル樹脂組成物並びにこれを用いた電気絶縁用樹脂組成物及び電気機器絶縁物の製造方法
WO2017061006A1 (fr) * 2015-10-08 2017-04-13 三菱電機株式会社 Composition de vernis exempte de solvant, bobine isolée, procédé pour la production d'une telle composition, dispositif rotatif, et compresseur électrique fermé

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2890279B2 (ja) * 1992-08-11 1999-05-10 東京特殊電線株式会社 クレージング性及び低温での接着性に優れた自己融着性絶縁電線
JP2890280B2 (ja) * 1992-08-11 1999-05-10 東京特殊電線株式会社 クレージング性及び低温での接着性に優れた自己融着性絶縁電線
JP2003016847A (ja) * 2001-06-29 2003-01-17 Totoku Electric Co Ltd 自己融着性絶縁電線
CN112063270A (zh) * 2020-09-23 2020-12-11 安徽恒磁磁电有限公司 一种漆包线绝缘浸渍漆及其制备方法和应用

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009102586A (ja) * 2007-10-25 2009-05-14 Kyocera Chemical Corp 熱硬化性樹脂組成物、硬化物および高熱伝導コイル
WO2016072425A1 (fr) * 2014-11-07 2016-05-12 古河電気工業株式会社 Fil isolant et machine électrique rotative
JP2017048329A (ja) * 2015-09-03 2017-03-09 日立化成株式会社 不飽和ポリエステル樹脂組成物並びにこれを用いた電気絶縁用樹脂組成物及び電気機器絶縁物の製造方法
WO2017061006A1 (fr) * 2015-10-08 2017-04-13 三菱電機株式会社 Composition de vernis exempte de solvant, bobine isolée, procédé pour la production d'une telle composition, dispositif rotatif, et compresseur électrique fermé

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