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Formula and preparation method of insulating silicone rubber applied to piezo-resistors

A technology of varistor and insulating silicon, which is applied in the field of insulating silicone rubber formula and its preparation, can solve the problems of poor resistance to high and low temperature impact, etc., and achieve the effects of solving adhesion, long service life, and avoiding dust pollution

Active Publication Date: 2020-10-16
CHENGDU TIEDA ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of poor high and low temperature impact resistance existing in the above-mentioned existing insulating layer materials, and easy expansion, cracking, and falling off when impacted by high-energy-density lightning wave surge current at high temperatures and affecting insulation performance, the present invention provides an application in voltage The insulating silicone rubber formula on the sensitive resistor and its preparation method can have good impact resistance after modification of the material through its high elasticity characteristics, and at the same time have good tensile strength, and are not easy to break and fall off

Method used

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  • Formula and preparation method of insulating silicone rubber applied to piezo-resistors

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Embodiment 1

[0041] This embodiment specifically discloses a formula of insulating silicone rubber, which is an insulating material specially used for piezoresistors.

[0042]Since the varistor is mainly composed of a pressure-sensitive ceramic chip, pins and packaging layer, and the main function of the packaging layer is to isolate it from the external environment, to prevent moisture, dust particles and other pollutants from contaminating the chip, while the packaging layer It has extremely high insulation ability and adhesion, and can avoid serious damage to ceramic chips caused by arc flashover when the voltage is too high.

[0043] The encapsulation layer in the prior art is a multi-material wrapping structure, because the role of the encapsulation layer is particularly important, especially in the case of high and low temperature cycle shocks, the stress caused by the different thermal expansion coefficients of various materials will directly act on the encapsulation layer, if Poor ...

Embodiment 2

[0059] In this embodiment, a varistor is provided, which includes a disc-shaped varistor ceramic body and pins arranged on the circular surfaces at both ends of the varistor ceramic body, and is wrapped with a soft silicone rubber layer on the outside For sealing and insulation.

[0060] The soft silicone rubber layer is adjusted by a special formula, so that it has better high and low temperature impact resistance. The specific formula is as follows:

[0061] Hexamethyldisiloxane 5%

[0062] Ethyl orthosilicate 3%

[0063] Ethyl polysilicate 2%

[0064] Phenyl silica gel······················ 25%

[0065] Hydroxy silicone oil 30%

[0066] Nitrogen Flame Retardant················ 10%

[0067] Phosphorus Flame Retardant··················· 10%

[0068] Thixotropic agent 10%

[0069] Curing agent····················· 5%

[0070] Among them, the resin product is obtained by kneading the hexamethyldisiloxane, tetraethyl orthosilicate and polyethyl silicate that make up the ...

Embodiment 3

[0073] In this embodiment, a varistor is provided, which includes a cylindrical varistor ceramic body and pins arranged on the circular surfaces at both ends of the varistor ceramic body, and is wrapped with a soft silicone rubber layer for For sealing and insulation.

[0074] The soft silicone rubber layer is adjusted by a special formula, so that it has better high and low temperature impact resistance. The specific formula is as follows:

[0075] Hexamethyldisiloxane 5%

[0076] Ethyl orthosilicate 3%

[0077] Polyethylsilicate··············2%

[0078] Phenyl silica gel 25%

[0079] Hydroxy silicone oil 30%

[0080] Nitrogen Flame Retardant... 10%

[0081] Phosphorus Flame Retardant··········· 10%

[0082] Thixotropic agent 10%

[0083] Curing agent················3%

[0084] Photosensitive color powder (titanium dioxide)...2%

[0085] Among them, the resin product is obtained by kneading the hexamethyldisiloxane, tetraethyl orthosilicate and polyethyl silicate tha...

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Abstract

The invention discloses a formula and preparation method of insulating silicone rubber applied to piezo-resistors. A packaging material layer, which is used for forming the outer part of a piezo-resistor, comprises the following components in percentage by mass: 20-30% of raw silicone rubber, 40-60% of an auxiliary agent, 10-17% of a reinforcing resin material, 10-15% of a thixotropic agent and 3-5% of a curing agent. The invention also discloses a preparation method, which comprises the following steps: proportionally and uniformly mixing and vulcanizing the raw silicone rubber, the auxiliaryagent and the reinforcing resin material to obtain an organic silicon synthetic material; stirring the organic silicon synthetic material, a curing agent and a thixotropic agent in proportion, and curing at the normal temperature to form a silicone rubber finished product. The high-low-temperature cycle performance of the product is improved when the insulating silicone rubber is applied to a piezo-resistor, and compared with the prior art, the results of multiple high-low-temperature cycle tests show that the insulating silicone rubber can tolerate a larger range of high-low-temperature impact and has a longer service life.

Description

technical field [0001] The invention belongs to the technical field of insulating or dielectric materials, and in particular relates to a formula of insulating silicon rubber applied to varistors and a preparation method thereof. Background technique [0002] The varistor is a resistance device with nonlinear volt-ampere characteristics, which is mainly used in circuits to absorb line surges for protection purposes. It mainly forms a diode effect through the internal ceramic block composed of zinc oxide particles and a small amount of other metal oxides or polymers. When encountering high voltage, it will reversely collapse due to hot electrons and tunneling effects, and the flow rate is large. Current, the main index is determined by the specified lightning wave surge current. [0003] The ceramic block structure is usually covered and bonded by a layer of insulating material, so as to form an isolation protection for the internal material and prevent the surge from arcing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K13/04C08K7/26C08K3/34C08K5/57C08K3/22H01C7/10H01C1/02
CPCC08L83/04H01C7/10H01C1/02C08L2205/025C08L2205/03C08L2201/08C08K2003/2241C08K13/04C08K7/26C08K3/346C08K5/57C08K3/22
Inventor 张治成石小龙叶磊詹俊鹄章俊
Owner CHENGDU TIEDA ELECTRONICS CORP