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Epoxy resin casting insulating material and preparation method thereof

An epoxy resin, casting insulation technology, applied in the field of composite materials, can solve problems such as large shrinkage rate, and achieve the effect of better shape, excellent arc resistance, and less cracking

Inactive Publication Date: 2019-03-12
株洲电力机车广缘科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The shrinkage rate of existing epoxy castables is relatively large, generally 0.5% to 0.8%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In terms of parts by mass, the epoxy resin casting insulating material of this embodiment includes 10 parts of modified BPA type epoxy resin, 8 parts of liquid modified carboxylic anhydride, 26 parts of 1000 mesh modified silica and 200 mesh water mill muscovite powder 5 servings.

[0040] The preparation method of epoxy resin cast insulating material as above, comprises the steps:

[0041] S1. Weigh 10 parts of epoxy resin in parts by mass, add it into the stirring pot, and heat up. When the temperature of the resin reaches 60, add liquid modified carboxylic anhydride according to the proportion, and stir evenly to obtain a mixed slurry;

[0042] S2. Add 5 parts of water-milled muscovite powder to the mixed slurry obtained in step S1, and stir evenly;

[0043] S3. Add 26 parts of modified silica powder to the mixed solution obtained in step S2, stir evenly and let it stand for 30 minutes under the environment of -0.1MPa, to obtain an epoxy resin casting insulating mat...

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Abstract

The invention relates to an epoxy resin casting insulating material. The epoxy resin casting insulating material comprises the following raw materials in parts by mass: 7-13 parts of epoxy resin, 5-11parts of a curing agent, 20-30 parts of modified silicon dioxide powder and 2-8 parts of mica powder. The epoxy resin casting insulating material has an excellent formation processing property, is suitable for an APG technology and a vacuum casting technology, and suitable for manual casting moulding. An insulating component prepared by the material has a good insulating property and excellent arc resistance, and is capable of solving a technical problem that the arc resistance of an epoxy casting material is poor, wherein the arc resistance of the material can reach more than 210 s. The material has a lower curing shrinkage rate which is 0.1%-0.05% only. An overlarge stress is prevented from being generated between a metal insert and an insulator through the smaller curing shrinkage rate, and a problem that a product is cracked in a place of the metal insert is prevented from happening. The insulating component formed and prepared by using the insulating material has higher strengthand toughness, and is good in secondary machining property.

Description

technical field [0001] The invention relates to an epoxy resin cast insulating material, which belongs to the field of composite materials. Background technique [0002] Epoxy resin has good electrical properties, high mechanical strength and low cost, making epoxy resin the most suitable casting material for insulating parts. However, compared with inorganic insulating materials, epoxy resin insulating materials have poor arc resistance, and electrical trace damage on the surface of insulating parts is often found during maintenance and testing. [0003] At present, the main method is to improve the arc resistance of epoxy castable materials through surface treatment, such as spraying silicone rubber coating on the surface of insulating parts and fluorinating treatment on the surface of insulating parts. For example, Alstom achieves The surface of the insulator is inert, and the arc resistance is about 200s. [0004] The arc resistance of epoxy resin is generally 180 s to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K9/06C08K3/36C08K3/34B29C39/10B29C39/36B29C39/38
CPCB29C39/10B29C39/36B29C39/38C08K3/34C08K3/36C08K9/06C08K2201/003C08L63/00
Inventor 罗赞才廖庆华王刚汪文斌蒋小林史红岩向龙李纬
Owner 株洲电力机车广缘科技有限责任公司
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