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High temperature resistant heat-conducting silica gel sheet and preparation method thereof

A heat-conducting silicone sheet, high-temperature-resistant technology, applied in the field of high-temperature-resistant heat-conducting silicone sheet, can solve the problems that the temperature resistance can only reach 200°C, and the long-term temperature resistance can only reach 160°C

Inactive Publication Date: 2013-10-09
SUZHOU TIANMAI THERMAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermally conductive silicone sheets have better heat resistance, but the long-term temperature resistance of the existing thermally conductive silicone sheets on the market can only reach 160°C, and the higher ones can only reach 200°C

Method used

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  • High temperature resistant heat-conducting silica gel sheet and preparation method thereof
  • High temperature resistant heat-conducting silica gel sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] Preparation of thermally conductive compound

[0031] Add the specified amount of vinyl-terminated polydimethylsiloxane and vinyl-terminated methylphenyl silicone oil into the planetary mixer, mix evenly, and then add heat-conducting powder, heat-resistant additives, coupling agents and other auxiliary materials in three times. The agent was stirred, and the temperature was raised to 150°C at the same time, and the temperature began to drop after stirring for 3 hours. Add hydrogen-containing silicone oil and inhibitor sequentially at room temperature. After stirring well, set aside.

[0032] take shape

[0033] Use a double-roll calender or a multi-roll calender to put the prepared rubber on the PET coated with a release agent, and at the same time, cover the upper layer with PET coated with a release agent, and calender to the required thickness. Or heated and vulcanized in an integrated heating tunnel.

[0034] Different formulations were used to prepare high-temp...

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Abstract

The invention discloses a high temperature resistant heat-conducting silica gel sheet and a preparation method thereof. The high temperature resistant heat-conducting silica gel sheet is characterized by comprising the following components in parts by weight: 50-80 parts of vinyl end capped polydimethylsiloxane (PDMS), 20-50 parts of vinyl end capped methyl phenyl silicone oil, 0.3-10 parts of containing hydrogen silicone oil, 2-6 parts of platinum catalyst, 0.2-0.6 parts of inhibitor, 5-100 parts of heat resistant additive and 400-1200 parts of heat-conducting powder. The preparation method of the high temperature resistant heat-conducting silica gel sheet comprises the following steps: firstly, uniformly mixing the vinyl end capped polydimethylsiloxane and the vinyl end capped methyl phenyl silicone oil in a kneading machine; adding the treated or untreated heat-conducting powder and the heat resistant additive which are added in batches, after mixing uniformly, adding the containing hydrogen silicone oil, the inhibitor and the catalyst; and mixing uniformly, and heating and solidifying in a forming machine to form a sheet. The heat resistant silica gel sheet provided by the invention is aged at 250 DEG C for 1000 hours, but still has good usability, and the changes of the hardness and the heat conductivity coefficient are within acceptable ranges.

Description

technical field [0001] The invention relates to a high-temperature-resistant and heat-conducting silica gel sheet, in particular to a high-temperature-resistant and heat-conducting silica gel sheet used in large-scale industrial equipment. Background technique [0002] As the integration of electronic equipment and industrial equipment is getting higher and higher, its heat generation is also increasing, especially for some large industrial equipment, the temperature generated by the accumulation of heat even exceeds 250 ° C for a long time, based on ideal requirements , the heat generated by the equipment can be dissipated as soon as possible, but usually these large-scale industrial equipment have large tolerance and fit gaps, and materials with good thermal conductivity and heat resistance, such as graphite sheets, are difficult to meet the requirements of large gaps. Therefore, the material that can meet the heat transfer requirements of large gaps is still dominated by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K3/36C08K3/22C08K3/04C08K3/28C08K3/34C08K7/06C08K7/08C08K7/10C08K7/18
Inventor 刘晓阳
Owner SUZHOU TIANMAI THERMAL TECH
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