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High-thermal-conductivity epoxy VPI resin for high-voltage motor as well as preparation method and application thereof

A high-voltage motor and epoxy resin technology, applied in the field of insulating materials for high-voltage motors, can solve the problems of high viscosity of the system, large size of thermally conductive powder, poor thermal conductivity, etc., and achieve high thermal conductivity, low dielectric loss, and breakdown. The effect of high field strength

Pending Publication Date: 2022-04-22
SUZHOU JUFENG ELECTRICAL INSULATION SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] VPI resin is currently used in high-voltage motors, which has poor thermal conductivity and a thermal conductivity of about 0.2W / (m.K), which cannot meet the technical requirements for improving heat dissipation and reducing the temperature rise of the motor.
In addition, the existing high thermal conductivity impregnation resin technology is mainly applied to the insulation impregnation treatment of low-voltage motors. The viscosity of the system is large, the size of the heat-conducting powder is large, and it is easy to settle during use, which cannot meet the VPI insulation treatment process and insulation technical requirements of high-voltage coil windings. , so there is an urgent need to develop a new type of high thermal conductivity VPI resin for high voltage motors

Method used

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  • High-thermal-conductivity epoxy VPI resin for high-voltage motor as well as preparation method and application thereof

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preparation example Construction

[0066] In some preferred embodiments, the preparation method of the modified thermally conductive filler includes the following steps:

[0067] (1) Mix silane coupling agent (KH570), glycidyl alcohol, hydroquinone, stannous chloride or dibutyltin dilaurate, stir evenly, heat up to 140~150°C to react, and the reactants are alcohol-free When the quasi-solvent is distilled out, vacuumize to -0.05~-0.15Mpa, keep warm, keep vacuum and continue to react for 1~2h to obtain the modified resin;

[0068] (2) Mix nano-scale boron nitride, nano-scale alumina and nano-scale silica evenly to prepare a compound mixed powder, dissolve the compound mixed powder in an organic solvent, homogeneously emulsify, grind and disperse to D50<100nm, then mix with the modified resin in step (1) and stannous chloride or dibutyltin dilaurate, and then make the mixed system react at 140~150°C, and the reactant has no alcohol solvent After distillation, the temperature is raised to 170~190°C, and the vacuum...

Embodiment 1

[0080] This embodiment provides a high thermal conductivity epoxy VPI resin for high voltage motors, which is prepared through the following steps:

[0081] Synthesis of modified resin: Add 3500g KH570 into the reaction bottle, add 1749.15g of glycidyl alcohol, 4.20g of stannous chloride and 2.63g of hydroquinone, stir evenly, heat up to 145°C for reaction, and the reactant has no methanol When the solvent is distilled off, evacuate to -0.095MPa, keep warm and keep the vacuum to continue the reaction for 2 hours, and lower to normal temperature to obtain the modified resin.

[0082] Add 500g 60nm boron nitride, 694.5g 35nm alumina, 1583.3g 50nm silicon dioxide into the powder mixer and mix evenly, then transfer the mixed powder to a homogeneous emulsification bottle, add 5158.8g N-methylpyrrolidone , start the homogeneous emulsifier, control the speed at 5000r / min, emulsify uniformly for 2 hours, transfer the material to the grinder, grind and disperse until D50<100nm. Add th...

Embodiment 2

[0086] This embodiment provides a high thermal conductivity epoxy VPI resin for high voltage motors, which is prepared through the following steps:

[0087] The surface-modified thermally conductive filler prepared in Example 1 was used.

[0088] Add 860g of 431 epoxy resin into the reaction bottle, raise the temperature to 116°C, add 74.14g of aluminum acetylacetonate and 59.31g of zinc isooctanoate, stir and dissolve evenly, and immediately cool down to below 45°C, add 148.28g of JF-956 polyesterimide Resin, 1215.86g of diethylene glycol dimethacrylate, 20.76g of 983 dispersant, 2.07g of TBC, 8.30g of 5600 defoamer, stirred evenly to obtain matrix resin.

[0089] Add 563.45g of surface-modified thermally conductive fillers to the above matrix resin, emulsify and disperse for 2 hours at a speed of 8300r / min on a homogeneous emulsifier, and then transfer the material to a grinder (the jacket needs to be cooled by cooling water during the grinding process to control the materia...

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Abstract

The invention relates to high-thermal-conductivity epoxy VPI resin for a high-voltage motor and a preparation method and application thereof.The high-thermal-conductivity epoxy VPI resin is prepared from, by weight, 20%-35% of epoxy resin, 2%-10% of curing agent, 3%-10% of polyesterimide resin, 12%-35% of modified heat conduction filler, 25%-43% of active cross-linking monomer, 0.3%-1.5% of dispersing agent, 0.2%-1% of initiator and 0.02%-1.2% of auxiliaries; the modified heat-conducting filler comprises nano-scale boron nitride, nano-scale aluminum oxide and nano-scale silicon dioxide. The high-thermal-conductivity epoxy VPI resin for the high-voltage motor, provided by the invention, has the advantages of low viscosity, high thermal conductivity coefficient, high breakdown field strength and low dielectric loss, and is particularly suitable for being applied to the high-voltage motor with the voltage class of 6kV and above.

Description

technical field [0001] The invention belongs to the field of insulating materials for high-voltage motors, and in particular relates to a high-thermal-conductivity epoxy VPI resin for high-voltage motors and a preparation method and application thereof. Background technique [0002] In recent years, with the continuous upgrading of high-voltage motors, generators and other products, the power density continues to increase, and the motor generates heat during operation, which will accelerate the aging of the insulating materials and systems used and shorten the service life. In order to alleviate the problem of motor heating during operation, it is necessary to use high thermal conductivity main insulation materials, such as high thermal conductivity mica tape, high thermal conductivity VPI resin and other products. [0003] VPI resin is currently used in high-voltage motors, which has poor thermal conductivity and a thermal conductivity of about 0.2W / (m.K), which cannot meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F283/04C08F222/14C08F2/44C08K9/06C08K3/38C08K3/22C08K3/36C08G59/22
CPCC08F283/10C08F283/04C08F2/44C08K9/08C08K3/38C08K3/22C08K3/36C08G59/22C08K2003/2227C08K2003/385C08K2201/011C08F222/102
Inventor 周成徐伟红夏宇
Owner SUZHOU JUFENG ELECTRICAL INSULATION SYST
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