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High stability conductive elastomer for electromagnetic shielding and preparation method thereof

A technology with high stability and electromagnetic shielding, which is applied in the field of high-stability conductive elastomers for electromagnetic shielding and its preparation, can solve the problems of low tensile strength and low elongation at break, and achieve high tensile strength and tear resistance. High elongation at break, good shielding effect

Active Publication Date: 2018-02-02
PINGHU ALLIED IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a high-stability conductive elastomer for electromagnetic shielding and its preparation method, so as to solve the problems of low tensile strength and low elongation at break in existing conductive elastomers

Method used

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preparation example Construction

[0022] A preparation method of high-stability conductive elastomer for electromagnetic shielding, comprising the following steps:

[0023] Step 1: Put the silicone rubber into a kneader or internal mixer for mixing, add silane coupling agent, graphene, silicone oil, and internal mold release agent at a temperature of 100-120°C and mix for 10-30 minutes, then Add conductive fillers and knead for 10-30 minutes to prepare semi-finished rubber mixes;

[0024] Step 2: Mix the semi-finished rubber compound prepared in Step 1 at a temperature of 15-35°C for 10-30 minutes, then add a cross-linking agent and mix for 10-30 minutes to prepare a conductive silicone rubber compound;

[0025] Step 3: Put the silicone rubber into a kneader or internal mixer for mixing, add an internal release agent at a temperature of 15-35°C and mix for 10-30 minutes to obtain a semi-finished product of pure silicone rubber;

[0026] Step 4: Mix the semi-finished pure silicone rubber compound prepared in S...

Embodiment 1

[0032] A high-stability conductive elastomer for electromagnetic shielding, comprising the following components: the conductive filler in this implementation is nickel-coated graphite powder, and the nickel content is 60wt.%, and the silicone rubber is vinyl-terminated polydimethylsiloxane alkane silicone rubber, the silane coupling agent is vinyltriethoxysilane (A-151), the internal release agent is zinc stearate, and the crosslinking agent is 2,4-dichlorobenzoyl peroxide (DCBP ), 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (DBPMH).

[0033] A preparation method of high-stability conductive elastomer for electromagnetic shielding, comprising the following steps:

[0034] Step 1: Put 673g of silicone rubber containing vinyl-terminated polydimethylsiloxane into an internal mixer for mixing, and add 13g of vinyltriethoxysilane (A-151) at a temperature of 110°C, Mix 15 minutes after 13g zinc stearate, then add 1272g nickel-clad graphite powder and mix 15 minutes to make the mix...

Embodiment 2

[0041] A high-stability conductive elastomer for electromagnetic shielding, comprising the following components: the conductive filler in this implementation is nickel-coated graphite powder, and the nickel content is 60wt.%, and the silicone rubber is vinyl-terminated polydimethylsiloxane alkane silicone rubber, the silane coupling agent is vinyltriethoxysilane (A-151), the internal release agent is zinc stearate, and the crosslinking agent is 2,4-dichlorobenzoyl peroxide (DCBP ), 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (DBPMH).

[0042] Step 1: Put 720g of silicone rubber containing vinyl-terminated polydimethylsiloxane into an internal mixer for mixing, and add 14g of vinyltriethoxysilane (A-151) at a temperature of 100°C, After 14g zinc stearate, knead for 30 minutes, then add 1224g nickel-clad graphite powder and knead for 30 minutes to make the semi-finished rubber mix;

[0043] Step 2: Mix the semi-finished rubber compound prepared in Step 1 at 15°C for 30 minutes...

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PUM

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Abstract

The invention relates to a high stability conductive elastomer for electromagnetic shielding. The high stability conductive elastomer comprises the following components: 100 parts by mass of siliconerubber, 100-400 parts by mass of conductive filler, 0-10 parts by mass of silicone oil, 0-10 parts by mass of graphene, 1-5 parts by mass of a silane coupling agent, 0.5-5 parts by mass of an internalreleasing agent, and 0.5-10 parts by mass of a crosslinking agent. The conductive elastomer prepared from the components has the advantages of high tensile strength, high elongation at break, low compressive deformation, low product cost and good shielding effectiveness, the tensile strength and elongation at break enable difficult pull-apart of the product in the assembly process and reusabilityof the product during reworking, the compressive deformation is low, and relative to pure electrically conductive silicone products, the product provided by the invention has low compressive deformation amount, so that the whole installation shell has good sealing performance and good shielding effectiveness, and the product cost is low. In addition, the invention also provides a preparation method of the high stability conductive elastomer for electromagnetic shielding.

Description

technical field [0001] The invention relates to a highly stable conductive elastomer for electromagnetic shielding and a preparation method thereof. Background technique [0002] Conductive rubber is made of rubber as the base rubber, filled with mixed conductive fillers and crosslinking agents, etc., and has good conductivity and filling properties. It is used in electronics, telecommunications, electric power, military industry, aviation, aerospace and ships It is widely used in electronic and microwave waveguide systems such as chassis, cabinets, shelters and other sealing and electromagnetic shielding occasions. Most of the existing conductive rubber is based on silicone rubber. Compared with ordinary conductive rubber, conductive silicone rubber has small volume resistivity, low hardness, high and low temperature resistance (-70 to 200°C), aging resistance, and processing and manufacturing process performance. Good advantages, especially suitable for the manufacture of...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/04C08K13/06C08K9/02C08K3/04C08K5/098C08K5/5425C08K7/00C08K3/08
CPCC08K3/04C08K5/098C08K5/5425C08K9/02C08L83/04C08K2003/0812C08K2201/001C08L2205/025C08L2203/20C08K13/06C08K7/00C08K3/08
Inventor 冯志成
Owner PINGHU ALLIED IND
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