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A varistor using a silicone rubber insulating layer and a manufacturing method thereof

A silicon rubber insulating layer and varistor technology, applied in varistors, overvoltage protection resistors, resistors, etc., can solve the problems of poor resistance to high and low temperature impact, achieve long service life, and solve the problem of adhesion , Improve the effect of withstanding high current impact

Active Publication Date: 2022-07-01
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 temperature, the problem that the insulation performance is affected, the present invention provides a silicone rubber The varistor of the insulating layer and its manufacturing method can have better impact resistance after material modification through its characteristics of higher elasticity and higher adhesion, and have better tensile strength at the same time. Cracks and falls off easily

Method used

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  • A varistor using a silicone rubber insulating layer and a manufacturing method thereof

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Effect test

Embodiment 1

[0036] This embodiment specifically discloses a formula of insulating silicone rubber, which is an insulating material specially used for varistors.

[0037] Since the varistor is mainly composed of pressure-sensitive ceramic chips, pins and packaging layers, the main function of the packaging layer is to isolate it from the external environment to avoid contamination of the chip by pollutants such as moisture and dust particles. At the same time, the packaging layer It has extremely high insulating ability and adhesive force, which can avoid serious damage to the porcelain chip such as arc flashover when the voltage is too high.

[0038]The encapsulation layer in the prior art is a multi-material encapsulation structure, because the role of the encapsulation layer is particularly important, especially in the case of high and low temperature cyclic impact, the stress caused by the different thermal expansion coefficients of various materials will directly act on the encapsulati...

Embodiment 2

[0054] 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 on the outside. for sealing and insulation.

[0055] The soft silicone rubber layer is adjusted by a special formula, so that it has better impact resistance at high and low temperature. The specific formula is as follows:

[0056] Hexamethyldisilazane 5%

[0057] Ethyl orthosilicate 3%

[0058] Polyethyl Silicate 2%

[0059] Phenyl Silica...25%

[0060] Hydroxy silicone oil 30%

[0061] Nitrogen flame retardants 10%

[0062] Phosphorus-based flame retardants 10%

[0063] Thixotropic agent 10%

[0064] Curing agent 5%

[0065] Wherein, the hexamethyldisiloxane, ethyl orthosilicate and polyethyl silicate that constitute the reinforcing resin material are kneaded and reacted to obtain a resin product, and then the reinforcing resin materi...

Embodiment 3

[0068] 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 on the outside. for sealing and insulation.

[0069] The soft silicone rubber layer is adjusted by a special formula, so that it has better impact resistance at high and low temperature. The specific formula is as follows:

[0070] Hexamethyldisilazane 5%

[0071] Ethyl orthosilicate 3%

[0072] Polyethyl Silicate...2%

[0073] Phenyl Silica...25%

[0074] Hydroxy silicone oil...30%

[0075] Nitrogen flame retardants 10%

[0076] Phosphorus-based flame retardants 10%

[0077] Thixotropic agent 10%

[0078] Curing agent ·······················································3%

[0079] Photosensitive toner (titanium dioxide) ···························································· 2%

[0080] Wherein, the hexamethyldisiloxane, ethyl...

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Abstract

The invention discloses a varistor adopting a silicone rubber insulating layer and a manufacturing method thereof, comprising a varistor ceramic body and two end surface electrode pins of the varistor ceramic body; and also comprising connecting the varistor ceramic body and the The pins are covered to form an insulating and protective soft silicone rubber layer; the pins pass through the soft silicone rubber layer for connection of external devices. A manufacturing method is also disclosed. First, the two pins are respectively arranged on the two end faces of the piezoresistor porcelain body; then the piezoresistor porcelain body connected with the pins is immersed in the liquid raw material of the soft silicone rubber layer. , and dip-coating for 1-3 times, take it out and cure it at room temperature, test its performance after curing, and get the finished product after passing the test. The present invention is different from the existing silicone rubber technology, and the special formula solves the bonding force between the pressure-sensitive ceramic and the silica gel, and improves the product's resistance to high-density lightning surge and large current impact, especially the high-density lightning surge at high temperature. Current impulse performance.

Description

technical field [0001] The invention belongs to the technical field of insulating or dielectric materials, and in particular relates to a varistor using a silicone rubber insulating layer and a manufacturing method thereof. Background technique [0002] Varistor is a resistive device with non-linear volt-ampere characteristics, which is mainly used as a safety device for absorbing line surges in circuits 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 polymer spacers. When encountering high voltage, reverse collapse occurs due to hot electrons and tunneling effect, and the flow is large. Current, the main indicator is determined by the specified lightning surge current. [0003] The ceramic block structure is usually covered and bonded by a layer of insulating material, so as to form insulation protection for the internal material and prevent the surge fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C1/034H01C1/04H01C7/12H01C17/02C08L83/04C08L83/02C08K13/04C08K13/02C08K5/5419C08K5/5415C08K3/22C08K7/26C08K3/34
CPCH01C1/034H01C1/04H01C7/12H01C17/02C08L83/04C08K2003/2241C08L2205/03C08L2205/025C08L83/02C08K13/04C08K13/02C08K5/5419C08K5/5415C08K3/22C08K7/26C08K3/346
Inventor 张治成石小龙叶磊詹俊鹄章俊
Owner CHENGDU TIEDA ELECTRONICS CORP