Preparation method of lightning arrester zinc oxide pressure-sensitive valve plate ceramic precursor

A technology of ceramic precursor and pressure-sensitive valve sheet, which is applied in the direction of varistor core, varistor, manufacturing resistor chip, etc. The effect of improving structural performance and good absorbing performance

Active Publication Date: 2020-11-13
ANHUI JINHUA ZINC OXIDE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used molding methods are mainly thermal cross-linking and isostatic cross-linking or based on mercapto-vinyl photocuring technology, which still have the defects of poor applicability and complicated process. In order to solve the above problems, it is urgent for those skilled in the art to develop A preparation method and application of a zinc oxide varistor ceramic precursor for surge arresters to meet existing market demands and performance requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Firstly, the ceramic precursor of the arrester zinc oxide varistor valve is prepared, including the following steps:

[0026] 1. In parts by weight, 90 parts of oxidation, 7 parts of bismuth trioxide whiskers, and 23 parts of polycarbosilane are dispersed in 91 parts of a mixed solvent composed of tetrahydrofuran and xylene at a volume ratio of 1:1, and magnetically stirred at a uniform speed for 15 minutes , to make it evenly mixed, and then slowly dropwise add 0.1 parts of cumene hydroperoxide and 1.6 parts of tetramethyltetravinylcyclotetrasiloxane, keep continuous magnetic stirring at a constant speed, and react at 80°C for 6h, After the reaction is over, remove tetrahydrofuran and xylene solvents in the mixture by cooling, filtering, and distillation under reduced pressure to obtain a mixture of zinc oxide and polycarbosilane; 2. polycarbosilane, trimethoxyvinylsilane, nickel triacetylacetonate, Triallyl cyanurate is uniformly mixed and transferred to the reactor a...

Embodiment 2

[0029] Firstly, the ceramic precursor of the arrester zinc oxide varistor valve is prepared, including the following steps:

[0030] 1. In parts by weight, 4 parts of bismuth trioxide whiskers, 19 parts of polycarbosilane and 85 parts of zinc oxide are dispersed in 85 parts of a mixed solvent composed of tetrahydrofuran and xylene in a volume ratio of 1:1, and magnetically stirred at a uniform speed Mix well for 15 minutes, then slowly add 0.05 parts of cumene hydroperoxide and 0.8 parts of tetramethyltetravinylcyclotetrasiloxane dropwise, keep continuous magnetic stirring at a constant speed, and react for 4 hours at 65°C , after the reaction is over, remove tetrahydrofuran and xylene solvents in the mixture by cooling, filtering, and distillation under reduced pressure, and combine to obtain a mixture of zinc oxide and polycarbosilane; Nickel acetone and triallyl cyanurate were evenly mixed and transferred to the reaction kettle according to the ratio of parts by weight of 7...

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Abstract

The invention belongs to the technical field of zinc oxide materials, and especially relates to a preparation method of a lightning arrester zinc oxide pressure-sensitive valve plate ceramic precursor. The preparation method is simple, polycarbosilane is used for sintering; polycarbosilane is modified and crosslinked by electron beam irradiation so as to obtain a polymer ceramic precursor; and thelightning arrester zinc oxide pressure-sensitive valve plate is obtained through pyrolysis under the protection of pressure-free nitrogen. The precursor has the advantages of being high in surge resistance, high in potential gradient and good in nonlinearity, is suitable for manufacturing valve plates and overvoltage protection pieces of large and small zinc oxide lightning arresters, and is suitable for being applied to lightning arresters.

Description

technical field [0001] The invention belongs to the technical field of zinc oxide materials, in particular to a method for preparing a ceramic precursor of a zinc oxide pressure-sensitive valve plate for lightning arresters. Background technique [0002] Surge arrester is a protective device that can absorb overvoltage energy and limit the magnitude of overvoltage. When in use, install the arrester near the protected equipment and connect it in parallel with the protected equipment. The protective characteristics of surge arresters are the basis of insulation coordination for power transmission and distribution equipment. A surge arrester with excellent performance can limit the overvoltage in the power system to a level that is harmless to the insulation. Improving the protection performance of lightning arresters can not only improve the operational reliability of power transmission and distribution systems, but also reduce the insulation level of electrical equipment, th...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/81C04B35/626C04B35/622C04B35/634C04B41/86C03C8/00H01C7/112H01C17/00H01C17/30C08F283/00C08F230/08C08F226/06
CPCC04B35/453C04B35/62605C04B35/622C04B35/63448C04B41/86C04B41/5022C03C8/00H01C7/112H01C17/006H01C17/30C08F283/00C04B2235/5276C04B2235/3298C04B2235/6562C04B2235/6565C04B2235/6567C08F230/085C08F226/06C04B41/4539C04B41/0072
Inventor 刘艺
Owner ANHUI JINHUA ZINC OXIDE CO LTD
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