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Epoxy resin for closed composite electric appliance and preparation method thereof

A technology for epoxy resin and combined electrical appliances, applied in the field of epoxy resin for closed combined electrical appliances and its preparation, can solve the problems of volume resistivity, leakage resistance, tracking resistance, arc resistance, low thermal expansion, etc., and achieves superior process operability, mechanical The effect of low strength and excellent anti-oxidation performance

Inactive Publication Date: 2021-11-02
GUANGDONG SIHUI INSTR TRANSFORMER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cured product of the epoxy resin composition of the invention has excellent properties such as heat resistance, mechanical strength, high and low temperature impact resistance, crack resistance and electrical insulation; it can be widely used in high-voltage power insulation such as insulating switches, power transmission devices, Insulation devices such as circuit breakers, disc insulators, support insulators, and power insulation rods have good market prospects, but the application did not study the yellowing resistance and aging resistance of the obtained epoxy resin
[0004] Chinese patent application 201410412657.9 discloses an outdoor electrical insulation modified epoxy resin composition, which includes epoxy resin, curing agent, and curing accelerator and inorganic fillers; the epoxy resin is a modified epoxy resin with a mass percentage of 50 to 80%, and the rest are mixed epoxy resins of unmodified epoxy resins or 100% modified epoxy resins; the The modified epoxy resin is an epoxy resin modified with a silicone modifier, and the curing agent is a bisanhydride curing agent, including methyl tetrahydrophthalic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride , methyl hexahydrophthalic anhydride, methyl nadic anhydride, or a mixture of several kinds; the inorganic filler is selected from silica, alumina, magnesium oxide, aluminum hydroxide, magnesium hydroxide, etc. One or a mixture of several; the outdoor electrical insulation modified epoxy resin composition has high weather resistance, better hydrophobicity, high volume resistivity, high resistance to tracking, high arc resistance, low thermal expansion It can be used to make sheds for outdoor insulating parts such as suspension insulators and crossarms for AC transmission lines. Compared with silicone rubber sheds, it can prevent bird pecks, resist trampling on inspection lines, and avoid transportation damage. This application also does not study the yellowing resistance and aging resistance of the epoxy resin obtained

Method used

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  • Epoxy resin for closed composite electric appliance and preparation method thereof
  • Epoxy resin for closed composite electric appliance and preparation method thereof
  • Epoxy resin for closed composite electric appliance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 A kind of epoxy resin for closed combination electrical appliances, comprises the raw material of following weight part:

[0040]

[0041]

[0042] Among them, the epoxy equivalent of the hydrogenated bisphenol A epoxy resin is 221eq / 100g; the viscosity at 25°C is 2845mPas.

[0043] Preparation method: comprising the following steps:

[0044] (1) Firstly, after melting the modified hydrogenated bisphenol A epoxy resin at 120±5°C, set it aside; add the modified hydrogenated bisphenol A epoxy resin with 100 times the amount of antioxidant 703 to the amount of antioxidant 703 in the formula The resin is uniformly dispersed with a high-speed stirrer to obtain a mixture 1; the mixture 1 is added to a mixing tank containing the remaining modified hydrogenated bisphenol A epoxy resin, stirred and dispersed uniformly to obtain a mixture 2;

[0045] (2) Add the electrical alumina filler pre-baked at 120±5°C into the mixture 2 in three batches, stir evenly and...

Embodiment 2

[0047] Embodiment 2 An epoxy resin for a closed combined electrical appliance, comprising the following raw materials in parts by weight:

[0048]

[0049] Among them, the epoxy equivalent of the hydrogenated bisphenol A epoxy resin is 247eq / 100g; the viscosity at 25°C is 3458mPas.

[0050] Preparation method: comprising the following steps:

[0051] (1) Firstly, after melting the modified hydrogenated bisphenol A epoxy resin at 120±5°C, set it aside; add the modified hydrogenated bisphenol A epoxy resin with 100 times the amount of antioxidant 703 to the amount of antioxidant 703 in the formula The resin is uniformly dispersed with a high-speed stirrer to obtain a mixture 1; the mixture 1 is added to a mixing tank containing the remaining modified hydrogenated bisphenol A epoxy resin, stirred and dispersed uniformly to obtain a mixture 2;

[0052](2) Add the electrical alumina filler pre-baked at 120±5°C into the mixture 2 in three batches, stir evenly and then add the cu...

Embodiment 3

[0054] Embodiment 3 An epoxy resin for a closed combined electrical appliance, comprising the following raw materials in parts by weight:

[0055]

[0056] Among them, the epoxy equivalent of the hydrogenated bisphenol A epoxy resin is 236eq / 100g; the viscosity at 25°C is 3246mPas.

[0057] Preparation method: comprising the following steps:

[0058] (1) Firstly, after melting the modified hydrogenated bisphenol A epoxy resin at 120±5°C, set it aside; add the modified hydrogenated bisphenol A epoxy resin with 100 times the amount of antioxidant 703 to the amount of antioxidant 703 in the formula The resin is uniformly dispersed with a high-speed stirrer to obtain a mixture 1; the mixture 1 is added to a mixing tank containing the remaining modified hydrogenated bisphenol A epoxy resin, stirred and dispersed uniformly to obtain a mixture 2;

[0059] (2) Add the electrical alumina filler pre-baked at 120±5°C into the mixture 2 in three batches, stir evenly and then add the c...

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Abstract

The invention provides epoxy resin for a closed combined electric appliance and a preparation method thereof, and belongs to the technical field of high polymer material preparation. According to the invention, a product produced from the modified epoxy resin obtained by carrying out benzene ring hydrotreating on the solid bisphenol A epoxy resin with larger molecular weight is more excellent in oxidation resistance, small in shrinkage rate of a cured product, stable in size and high in precision; a mixture of modified hexahydrophthalic anhydride and hexahydrophthalic anhydride is used as a curing agent, so that the shrinkage rate of a cured product is effectively reduced, and the product is stable in size and high in precision; and the antioxidant capable of being subjected to addition reaction with epoxy resin is adopted as the anti-yellowing agent, so that the influence on mechanical strength and the like is small, and the original necessary performance of the product is not influenced while the anti-yellowing effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to an epoxy resin for closed combined electrical appliances and a preparation method thereof. Background technique [0002] Most of the existing high-voltage epoxy resin products are prepared by curing and molding epoxy resin composite materials cured at medium and high temperatures, especially for insulating parts used in GIS combined electrical appliances, most of them use epoxy resin with relatively large molecular weight, It is formed by mixing reaction of acid anhydride curing agent and alumina powder filler. Due to the influence of alumina in the component, the color of the newly prepared product will be white; but because the organic polymerization reaction is incomplete reaction, there will be presence in the epoxy polymer There are free molecular groups, and polymers also have active molecular structures. They are prone to oxidation reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K3/22C08K5/18C08G59/24C08G59/62C08G59/42
CPCC08K3/22C08K5/18C08G59/24C08G59/62C08G59/4284C08L2203/20C08K2003/2227C08L2201/08C08L63/00
Inventor 张丽珍徐梁山张树华
Owner GUANGDONG SIHUI INSTR TRANSFORMER WORKS
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