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High heat conductive thermally-vulcanized silicone rubber composite material and preparation method thereof

A thermally vulcanized silicone rubber and composite material technology, which is applied in the field of silicone rubber materials, can solve the problems of expensive thermal conductive fillers and high filling volume restrictions, and achieve the effects of simple and effective modification methods, simple manufacturing processes, and fewer processes

Active Publication Date: 2015-01-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the thermally conductive silicone rubber produced in industry is only purely filled, and the high price and high filling amount of thermally conductive fillers limit the development and application of thermally conductive silicone rubber composite materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Modified alumina by surface-interface polymerization, weighed 10g of alumina and added to 400ml of water, then added 0.09g of sodium lauryl sulfate, stirred mechanically for 5min; added 231ul of pyrrole monomer, stirred for 5min; added 0.8g of ammonium persulfate, stirred After 4 hours, filter, wash and dry. The alumina used in the following examples is all prepared in this example, and the preparation methods of the modified carbon fiber and modified zinc oxide used are the same as in this example, except that the raw materials are replaced with corresponding substances.

Embodiment 2

[0034] Use the surface-interface polymerization method to modify 1um alumina, filter, dry at 100°C for 4 hours, and then add 100 parts of methyl vinyl silicone rubber to the open rubber mixer for mixing. The roller distance is 0.5mm. 5 times, then increase the roller distance to cover the rubber material; after the surface of the rubber material is smooth, add 50 parts of modified 1um alumina and 2 parts of double-25 in turn; after the rubber material is mixed evenly, adjust the roller distance to 1.5 mm output. Put the finally obtained tablet into the mold, vulcanize on a flatbed machine, the vulcanization time is 5min, the vulcanization temperature is 170°C, and the vulcanization pressure is 10°C, and the high thermal conductivity vulcanized silicone rubber composite material is obtained.

Embodiment 3

[0036] Use the surface-interface polymerization method to modify 40um and 1um alumina, filter, dry at 100℃×4h for later use, then add 100 parts of methyl vinyl silicone rubber to the open rubber mixer for mixing, the roller distance is 0.5mm, thin Pass 5 times, then increase the roller distance to cover the rubber material; after the surface of the rubber material is smooth, add 50 parts of modified alumina and 2 parts of double-25 in turn; after the rubber material is mixed evenly, adjust the roller distance to 1.5 mm output. Put the finally obtained tablet into the mold and vulcanize on a flatbed machine. The vulcanization time is 6 minutes, the vulcanization temperature is 170° C., and the vulcanization pressure is 10 MPa to obtain the high-temperature silicone rubber composite material.

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PUM

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Abstract

The invention discloses a high heat conductive thermally-vulcanized silicone rubber composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 100 parts of silicone rubber, 0.5 to 5 parts of vulcanizer, and 1 to 1000 parts of heat conducting agent. The preparation method comprises the following steps: carrying a modification treatment on the heat conducting agent, rolling the silicone rubber on a roller, adding the modified heat conducting agent taken as the filling material, and the vulcanizer in order, evenly mixing, pressing into sheets, placing the sheets into a mould, and finally carrying out vulcanization in a flat vulcanizing machine, wherein the vulcanizing time is 5 to 10 minutes, the vulcanizing temperature is 160 to 190 DEG C, and the vulcanizing pressure is 10 to 12 MPa. The provided silicone rubber composite material has the characteristics of good mechanical performance and high heat conductive coefficient.

Description

technical field [0001] The invention relates to the technical field of silicone rubber materials, in particular to a high thermal conductivity thermal vulcanized silicone rubber composite material and a preparation method. [0002] Background technique [0003] With the development of microelectronic assembly in the direction of densification, the temperature of the working environment of electronic components continues to rise, resulting in a significant decline in their reliability. Therefore, timely heat dissipation becomes an important factor affecting the service life of electronic components. Thermally conductive silicone rubber, as a type of silicone rubber composite material with extremely strong thermal conductivity, has been widely used in electronics, electrical, military and other fields that require heat dissipation, heat transfer, insulation, and shock absorption. Thermally conductive silicone rubber is of great significance to the densification, min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/08C08K13/06C08K9/04C08K7/06C08K3/22
Inventor 吴叔青李小奇
Owner SOUTH CHINA UNIV OF TECH
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