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Conductive silica gel and preparation method thereof and a silica gel key

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

Active Publication Date: 2022-07-29
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 and preparation method thereof and a silica gel key
  • Conductive silica gel and preparation method thereof and a silica gel key
  • Conductive silica gel and preparation method thereof and a silica gel key

Examples

Experimental program
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Effect test

preparation example 1

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

[0045] Silicon nitride modification treatment:

[0046] Weigh 40 kg of silicon nitride powder, put the silicon nitride powder into 300 L of anhydrous ethanol solution, carry out ultrasonic dispersion, the ultrasonic frequency is 40 kHz, and the ultrasonic time is 1 h 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 γ-aminopropyltriethyl Silane, prepared into reaction solution 1;

[0048] As soon as the temperature of the reaction solution was raised to 55°C, the reaction was kept for 6 hours, filtered, and the obtained solid was washed with deionized water for 3 times, and then freeze-dried to obtain modified silicon nitride.

[0049] Filler preparation:

[0050] The modified silicon nitrid...

preparation example 2-5

[0053]A modified conductive filler is different 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. Weights 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 is different from Preparation Example 1 in that the selection of aminosilane coupling agent is different, and the specific selection is shown in Table 3 below.

[0058] Table 3. Selection of aminosilane coupling agents

[0059]

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Abstract

The invention discloses a conductive silica gel and a preparation method thereof, and a silica gel button. A conductive silica gel is made from the following raw materials by weight: 40-60 parts of silicone rubber, 3-5 parts of modified conductive fillers, and 0.5-1.5 parts of vulcanizing agent; the modified conductive filler is covered with graphene oxide Silicon nitride-graphite oxide particles made of silicon carbide, the modified conductive has a core-shell structure. The conductive silica gel prepared in the present application has small volume resistance, good electrical conductivity and good thermal stability.

Description

technical field [0001] The invention relates to the technical field of silica gel products, in particular to a conductive silica gel and a preparation method thereof and a silica gel key. Background technique [0002] Conductive silicone is a silicone product with certain mechanical properties and electrical conductivity. Conductive silicone is often used in electrical buttons. Generally, conductive fillers are added to the raw silica gel material, and the conductive silica gel is made by the vulcanization reaction of the raw silica gel material and the vulcanizing agent. The conductive fillers are in contact with 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 conductive properties of conductive silica gel, that is, conductive silica g...

Claims

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Application Information

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Patent Type & Authority Patents(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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