Conductive silica gel, preparation method thereof and silica gel key

A technology of conductive silica gel and silicone rubber, which is applied in the field of silica gel products, can solve the problems of decreased surface conductivity of conductive silica gel, poor conductivity of conductive silica gel, and poor dispersion of conductive fillers, etc., to achieve moderate contact area and improve thermal decomposition. The effect of high initial temperature and high yield

Active Publication Date: 2021-10-29
深圳市富发世纪科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of the conductive silica gel prepared by this method is high, and the metal particles are easy to migrate on the surface of the raw silica gel, which will lead to a decrease in the surface conductivity of the conductive silica gel and unstable conductivity.
When carbon black, graphene, etc. are used as conductive fillers, the compatibility between the conductive filler and the silica gel raw material is poor, graphene is easy to agglomerate, and the dispersion performance of the conductive filler in the silica gel raw material is not good, resulting in the conductivity of the conductive silica gel. poor performance

Method used

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  • Conductive silica gel, preparation method thereof and silica gel key
  • Conductive silica gel, preparation method thereof and silica gel key
  • Conductive silica gel, preparation method thereof and silica gel key

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0044] A modified conductive filler, carried out according to the following steps:

[0045] Silicon nitride modification treatment:

[0046] Weigh 40kg of silicon nitride powder, put the silicon nitride powder into 300L of absolute ethanol solution, and carry out ultrasonic dispersion, the ultrasonic frequency is 40kHz, and the ultrasonic time is 1h, to obtain a silicon nitride suspension;

[0047] Under the condition that the silicon nitride suspension is stirred at a rate of 300r / min, add deionized water (the volume ratio of deionized water and absolute ethanol is 1:10), and continue to add 2kg of γ-aminopropyltriethyl Silane is prepared as reaction solution 1;

[0048] As soon as the temperature of the reaction solution was raised to 55° C., it was kept for 6 hours, filtered, and the obtained solid was washed with deionized water three times, and then freeze-dried to obtain modified silicon nitride.

[0049] Filling preparation:

[0050] Put the modified silicon nitride ...

preparation example 2-5

[0053]A modified conductive filler, which differs from Preparation Example 1 in that the weights of silicon nitride, γ-aminopropyltriethylsilane and graphene oxide dispersion are different, and the specific input amounts are shown in Table 2 below.

[0054] Table 2. Weight of silicon nitride, γ-aminopropyltriethylsilane and graphene oxide

[0055] Preparation example Silicon nitride / kg γ-Aminopropyltriethylsilane / kg Graphene oxide dispersion / L Preparation Example 1 40 2 200 Preparation example 2 40 4 200 Preparation example 3 40 6 200 Preparation Example 4 40 4 300 Preparation Example 5 40 4 400

preparation example 6-8

[0057] A modified conductive filler, which differs from Preparation Example 1 in that the choice of aminosilane coupling agent is different, and the specific choice is shown in Table 3 below.

[0058] Table 3. Choice of aminosilane coupling agent

[0059]

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Abstract

The invention discloses conductive silica gel, a preparation method thereof and a silica gel key. The conductive silica gel is prepared from the following raw materials in parts by weight: 40-60 parts of silicone rubber, 3-5 parts of a modified conductive filler and 0.5-1.5 parts of a vulcanizing agent, wherein the modified conductive filler is silicon nitride-graphite oxide particles formed by coating silicon carbide with graphene oxide, and the modified conductive filler has a core-shell structure. The conductive silica gel prepared by the invention is relatively small in volume resistance, good in conductivity and relatively good in thermal stability.

Description

technical field [0001] The invention relates to the technical field of silica gel products, in particular to a conductive silica gel, a preparation method thereof and a silica gel key. Background technique [0002] Conductive silica gel belongs to silica gel products and has certain mechanical properties and electrical conductivity. Conductive silicone is often used as electrical buttons. Generally, conductive fillers are added to the raw silica gel, and the raw silica gel and the vulcanizing agent are vulcanized to produce conductive silica gel. The conductive fillers contact each other in the conductive silica gel to form a conductive path, thereby obtaining conductivity. [0003] With the development of science and technology, the market demand for conductive silica gel is increasing day by day. Therefore, the market puts forward higher requirements for the conductivity of conductive silica gel, that is, the development of conductive silica gel in the direction of high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L83/07C08K9/10C08K3/04C08K3/34C08K9/06C08K5/14
CPCC08K9/10C08K3/042C08K3/34C08K9/06C08K5/14C08K2201/001C08L2201/08C08L83/04
Inventor 邹坚强沈海能
Owner 深圳市富发世纪科技有限公司
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