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Heat-conducting silica gel sheet and preparation method thereof

A technology of thermally conductive silicone sheet and vinyl silicone oil, applied in the field of thermally conductive filling materials, can solve problems such as low molecular volatilization

Inactive Publication Date: 2020-08-18
深圳市立凡硅胶制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a thermally conductive silica gel sheet and its preparation method for the problem of low molecular volatilization when using low-viscosity silicone oil, low-molecular-end vinyl polydimethylsiloxane and other materials for a long time in a high-temperature environment.

Method used

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Examples

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Effect test

preparation example Construction

[0017] A preparation method for a novel heat-conducting silica gel sheet, comprising the following steps:

[0018] Use a vacuum kneader to remove the vinyl silicone oil with a viscosity of 900-1100 under vacuum and a temperature of 150-200°C to reduce the low volatile matter in the oil and form a low-viscosity vinyl silicone oil;

[0019] Using a vacuum kneader, take 30-70 parts of low-viscosity vinyl silicone oil, 30-70 parts of vinyl silicone oil with a viscosity of 18000-22000, and 300-2000 parts of alumina content, mix and stir, vacuumize to remove air bubbles, and form vinyl Silicone oil mixture;

[0020] Using a vacuum kneader, the mixture is de-lowered twice to obtain a thermally conductive silica gel mixture with a volatile content of less than 0.2 wt%.

[0021] Coating equipment is used to press and mold the heat-conducting silica gel mixture to form a heat-conducting silica gel sheet.

[0022] The above-mentioned new type of heat-conducting silicone sheet, the seco...

Embodiment 1

[0024] Example 1: Using a vacuum kneader, under the conditions of vacuum and a temperature of 150 ° C, the vinyl silicone oil with a viscosity of 900 was removed to reduce the low volatile matter in the oil to form a low-volatility low-viscosity vinyl silicone oil;

[0025] Using a vacuum kneader, under vacuum conditions, take 30 parts of low-viscosity vinyl silicone oil, 70 parts of vinyl silicone oil with a viscosity of 22000, and 300 parts of aluminum oxide, mix and stir, vacuumize to remove air bubbles, and form a mixture;

[0026] Using a vacuum kneader, the mixture is de-lowered twice to obtain a thermally conductive silica gel mixture with a volatile content of less than 0.2 wt%.

[0027] Coating equipment is used to stir and vulcanize the heat-conducting silica gel mixture to form a heat-conducting silica gel sheet. The thermally conductive silicone sheet has a high hardness and an elongation of about 270Delta, which is suitable for heat conduction at a thermal interfa...

Embodiment 2

[0028] Example 2: Using a vacuum kneader, under the conditions of vacuum and a temperature of 200°C, the vinyl silicone oil with a viscosity of 1100 was removed to reduce the low volatile matter in the oil to form a low-volatility low-viscosity vinyl silicone oil;

[0029] Using a vacuum kneader, under vacuum conditions, take 70 parts of low-viscosity vinyl silicone oil, 30 parts of vinyl silicone oil with a viscosity of 18000, and 2000 parts of aluminum oxide, mix and stir, vacuumize and remove air bubbles, and form a mixture;

[0030] Using a vacuum kneader, the mixture is de-lowered twice to obtain a thermally conductive silica gel mixture with a volatile content of less than 0.2 wt%.

[0031] Coating equipment is used to pressurize and heat the heat-conducting silica gel mixture and then stir it to vulcanize the heat-conducting silica gel mixture to form a heat-conducting silica gel sheet. The thermally conductive silicone sheet has a low hardness and an elongation of abou...

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Abstract

A preparation method of a novel heat-conducting silica gel sheet comprises the following steps: removing low volatile matters in vinyl silicone oil with a viscosity of 900-1100 by adopting a vacuum kneading machine under the conditions of vacuum and a temperature of 150-200 DEG C to reduce low volatile matters in vinyl silicone oil so as to form low-viscosity vinyl silicone oil; mixing and stirring 30-70 parts of low-viscosity vinyl silicone oil, 30-70 parts of vinyl silicone oil with a viscosity of 18000-22000 and 300-2000 parts of aluminum oxide by adopting a vacuum kneading machine, vacuumizing to remove bubbles so as to form a vinyl silicone oil mixture; removing low volatile matters from the vinyl silicone oil mixture for a second time by using a vacuum kneading machine to obtain a heat-conducting silica gel mixture with a volatile matter content of less than 0.2 wt%, and carrying out compression molding on the heat-conducting silica gel mixture by using coating equipment to formthe heat-conducting silica gel sheet. The vinyl silicone oil with a viscosity of 900-1100 is subjected to secondary low volatile matter removal, so that the finished product has low volatility and a low oil penetration effect, and due to the vinyl silicone oil with a viscosity of 18000-22000, the finished product has high elongation and high toughness.

Description

technical field [0001] The invention relates to the technical field of thermally conductive filling materials, in particular to a thermally conductive silica gel sheet and a preparation method thereof. Background technique [0002] Thermally conductive silicone sheet is a kind of thermally conductive medium material synthesized by a special process with silica gel as the base material, adding various auxiliary materials such as metal oxides. In the industry, it is also called thermally conductive silicone pad, thermally conductive silicone film, and soft thermally conductive pad. , heat-conducting silicone gaskets, etc., are specially designed for the use of gaps to transfer heat. They can fill the gaps, open up the heat channel between the heat-generating part and the heat-dissipating part, effectively improve the heat transfer efficiency, and also play the role of insulation, shock absorption, Sealing and other functions can meet the design requirements of equipment miniat...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08K3/22C08G77/34
CPCC08G77/34C08K2003/2227C08L83/04C08L2205/025C08K3/22
Inventor 黄利翻
Owner 深圳市立凡硅胶制品有限公司
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