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A kind of epoxy resin composition and its preparation impregnated coil method

A technology of epoxy resin impregnating coils, which is applied in coil manufacturing, inductance/transformer/magnet manufacturing, electrical components, etc. It can solve problems such as damage, weak crack resistance, and cracks, and achieve good flow performance.

Active Publication Date: 2017-12-29
TONGXIANG JOY SCI & TECHCAL ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently used systems are based on bisphenol A epoxy resin / anhydride systems which are degradable by moisture, especially at high Penetrates better and does more damage

Method used

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  • A kind of epoxy resin composition and its preparation impregnated coil method
  • A kind of epoxy resin composition and its preparation impregnated coil method
  • A kind of epoxy resin composition and its preparation impregnated coil method

Examples

Experimental program
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Effect test

Embodiment 5

[0050] Embodiment 5 (application example)

[0051] (1) Preheat the coil winding at 100°C for 6 hours, and cool to 60°C before pouring;

[0052] (2) will accurately weigh each raw material of epoxy resin composition by the ratio in embodiment 1, at normal temperature, in vacuum tightness 1-3mbar, stirring and defoaming 3 hours;

[0053] (3) Place the coil winding in the pouring tank and vacuumize for 2 hours under the state of vacuum degree 3mbar;

[0054] (4) Pouring the epoxy resin composition into the pouring tank, keeping a vacuum of 4mbar, and soaking for 3 hours;

[0055] (5) Place the impregnated coil winding in a curing oven, keep it at 80°C for 3 hours, raise the temperature to 100°C in 30 minutes, keep it for 1.5 hours; raise the temperature to 120°C in 30 minutes, keep it for 2.5 hours; raise the temperature to 140°C in 60 minutes , Keep for 10 hours for final curing.

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Abstract

The invention discloses epoxy resin composition. The epoxy resin composition is characterized by comprising components in parts by weight as follows: 100 parts of epoxy resin, 10-30 parts of a flexibilizer, 1-10 parts of a curing agent, 50-100 parts of a heat conduction agent, 1-5 parts of a release agent, 1-5 parts of a flame retardant agent and 1-3 parts of pigment, wherein the curing agent is a liquid mixture of hydrogen cyanamide and derivatives of urea in the weigh ratio of (3:1)-(2:1), and the derivatives of urea comprise N,N-diethyl urea, N,N-dipropyl urea and N,N-methyl ethyl urea; the flexibilizer adopts polyether-polyamine; the heat conduction agent is selected from AlN, BN and Al2O3 and is granular particles comprising large particles and small particles, the average particle size of the large particles is 20-50 millimeters, the average particle size of the small particles is 1-5 millimeters, and the weight ratio of the large particles to the small particles is (5:1)-(1:1). The composition can be used for dipping coils.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an epoxy resin composition and its application. Background technique [0002] For air-core reactors currently used in power systems, the coils can be wound with glass fibers and wires and then impregnated with paint, or they can be wound with glass fibers, wires, and impregnated resins together by on-site wet method, but no matter what method is used for winding, Both need to fill the air gap existing inside the coil with resin, and then solidify and form a whole. The resin plays the roles of filling the air gap, heat transfer, moisture-proof, and preventing partial discharge in the reactor coil. [0003] At present, the impregnating resin used in the manufacture of air-core reactors is mainly prepared by mixing epoxy resin, curing agent, curing accelerator and other components. The thermal conductivity of the cured product is low, only 0.16-0.18W / (m·K) , ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08L71/00C08K13/02C08K3/22C08K5/098C08K5/521H01F41/04H01F41/12
CPCC08L63/00C08L2201/02C08L2203/20H01F41/127C08L71/00C08K13/02C08K2003/2227C08K5/098C08K5/521C08K2003/2241
Inventor 秦如堂
Owner TONGXIANG JOY SCI & TECHCAL ELECTRONICS
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