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A kind of preparation method of zinc oxide/epoxy resin composite varistor

A technology of piezoresistor and epoxy resin, which is applied in the manufacture of resistors, resistors, circuits, etc. It can solve the problems of ineffective contact of microspheres, difficulties in the preparation and molding process, and poor mechanical properties, so as to reduce the preparation cost and be easy to operate. , The effect of convenient insulation design

Active Publication Date: 2017-07-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems with traditional varistors: one is that the microspheres cannot be effectively contacted; the other is that the content of microspheres is too high, which leads to more difficult preparation and molding process and poorer mechanical properties

Method used

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  • A kind of preparation method of zinc oxide/epoxy resin composite varistor
  • A kind of preparation method of zinc oxide/epoxy resin composite varistor
  • A kind of preparation method of zinc oxide/epoxy resin composite varistor

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preparation example Construction

[0020] The preparation method of zinc oxide / epoxy resin composite varistor that the present invention proposes comprises the following steps:

[0021] (1) Weigh the raw materials according to the following mole percentages:

[0022]

[0023] mixing the above measured raw materials and then ball milling to obtain the first mixture with a particle size of 1-20 microns;

[0024] (2) granulating the above mixture by spray granulation to obtain microspheres with a diameter of 50 to 150 microns;

[0025] (3) The above-mentioned microspheres are heated to 1200°C at a rate of 0.55°C / min and sintered for 4.5 hours, and then cooled to room temperature at a rate of 1.6°C / min, and the sintered microspheres are sieved to obtain particles with a particle size of 100-125 microns. Varistor microspheres;

[0026] (4) Taking epoxy resin as the matrix, adding the above-mentioned piezoresistor microspheres in the matrix, the mass percentage added is: matrix: piezoresistor microspheres=3:(0.6...

Embodiment 1

[0030] (1) Weigh the raw materials according to the following mole percentages:

[0031]

[0032] mixing the above measured raw materials and then ball milling to obtain the first mixture with a particle size of 1-20 microns;

[0033] (2) granulating the above mixture by spray granulation to obtain microspheres with a diameter of 50 to 150 microns;

[0034] (3) The above-mentioned microspheres are heated to 1200°C at a rate of 0.55°C / min and sintered for 4.5 hours, and then cooled to room temperature at a rate of 1.6°C / min, and the sintered microspheres are sieved to obtain particles with a particle size of 100-125 microns. Varistor microspheres;

[0035] (4) Take epoxy resin as matrix, add above-mentioned varistor microsphere in matrix, the mass percent of adding is: matrix: varistor microsphere=3:0.8, obtains the second mixture, wherein said matrix is Room temperature curing epoxy resin composed of component A and component B, blended at room temperature for 5 minutes, ...

Embodiment 2

[0038] (1) Weigh the raw materials according to the following mole percentages:

[0039]

[0040] mixing the above measured raw materials and then ball milling to obtain the first mixture with a particle size of 1-20 microns;

[0041] (2) granulating the above mixture by spray granulation to obtain microspheres with a diameter of 50 to 150 microns;

[0042](3) The above-mentioned microspheres are heated to 1200°C at a rate of 0.55°C / min and sintered for 4.5 hours, then cooled to room temperature at a rate of 1.6°C / min, and the sintered microspheres are sieved to obtain a particle size of 100-125 microns. Varistor microspheres;

[0043] (4) Take epoxy resin as matrix, add above-mentioned varistor microsphere in matrix, the mass percent of adding is: matrix: varistor microsphere=3:1.2, obtains the second mixture, wherein said matrix is The room temperature curing epoxy resin composed of component A and component B is blended at room temperature for 5 minutes, and the vacuum...

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Abstract

The invention relates to a method for preparing a zinc oxide / epoxy resin composite voltage dependent resistor, and belongs to the technical field of electric materials. The method comprises the following steps: firstly, by taking ZnO as a main raw material, adding a small amount of Bi2O3, MnO2, Sb2O3, Co2O3, SiO2 and Cr2O3 according to a ratio, uniformly mixing, performing spray granulation so as to obtain microspheres, and sintering at high temperature so as to form voltage dependent resistor microspheres; uniformly commixing epoxy resin components A and B and the voltage dependent resistor microspheres according to a certain ratio under certain temperature conditions, and removing bubbles in vacuum; injecting the mixture into a mold with an electrode, standing for a certain period of time under the action of an alternative-current electric field, putting into an oven to heat, and taking out from the mold after being cured. According to the method provided by the invention, stable and effective chain-shaped conductive channels are formed in the microspheres inside the voltage dependent resistor under the action of the electric field by virtue of the small-bridge effect, molds with different electrode shapes can be adopted to form composite voltage dependent resistors of various shapes under a relatively low temperature condition, the use amount of oxides such as zinc oxide can be reduced, and the cost is also lowered.

Description

technical field [0001] The invention relates to a preparation method of a zinc oxide / epoxy resin composite varistor, belonging to the technical field of electrical materials. Background technique [0002] Zinc oxide varistors use ZnO as the main raw material, adding a small amount of Bi 2 o 3 , MnO 2 , Sb 2 o 3 、Co 2 o 3 , SiO 2 and Cr 2 o 3 etc., prepared by ceramic sintering process. Because of its low cost, large nonlinear coefficient, fast response time, small leakage current, large current capacity, and strong surge absorption capacity, it is widely used in the protection of abnormal overvoltage and surge absorption impact of electronic circuits. Because of its low cost, excellent nonlinear volt-ampere characteristics and large flow capacity, ZnO varistors are widely used in abnormal overvoltage protection of electronic circuits and as the core components of power system lightning arresters in power system lightning protection and power Equipment protection. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C17/00H01C17/30C08L63/00C08K3/22C08K3/36
Inventor 何金良胡军郭志冲杨霄曾嵘余占清
Owner TSINGHUA UNIV