Method for preparing high-heat-conducting silicon rubber compound material

A technology of thermally conductive silicone rubber and composite materials, used in heat exchange materials, chemical instruments and methods, etc.

Active Publication Date: 2012-12-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Mu Qiuhong and others prepared expanded graphite thermally conductive silicone rubber composites (Thermochimica Acta462(2007) 70-75) by solution intercalation, but the thermal conductivity of the prepared expanded graphite thermally conductive silicone rubber composites did not exceed 1W / m K

Method used

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  • Method for preparing high-heat-conducting silicon rubber compound material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) configure the water dispersion that contains expanded graphite mass fraction as 2wt%, pour it into a ball mill jar, then put it into a planetary ball mill, process it for 24h under the condition of 300rpm, vacuum filter the gained solution, remove the solvent, and obtain Samples were vacuum dried for use.

[0028] (2) 80 parts by weight of silicone rubber raw rubber is dropped into a double-roll mill, and the processing temperature is at 25° C., and then 30 parts by weight are added, and the expanded graphite processed through step (1) has a viscosity of 500 cs (25 parts by weight). ℃) of methyl silicone oil, thin pass 5 to 10 times, then add 2 parts by weight of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (curing agent), and mix After uniformity, thin pass the next film.

[0029] (3) Put the kneaded silicone rubber into a suitable mold, and vulcanize for 10 minutes at 175° C. and 10 MPa. The second-stage vulcanization was treated in a blast oven at 200°C for 4 h...

Embodiment 2

[0031] (1) configuration contains the DMF dispersion liquid that expanded graphite mass fraction is 2wt%, pours in the ball mill tank, then puts into planetary ball mill, handles 24h under the condition of 300rpm, the gained solution is carried out vacuum suction filtration, removes solution, so The samples were vacuum dried for use.

[0032] (2) 80 parts by weight of silicone rubber raw rubber is dropped into a two-roll mill, and the processing temperature is at 25°C, and then 30 parts by weight are added, and the expanded graphite processed through step (1) has a viscosity of 20 parts by weight of 500cs (25 ℃) of methyl silicone oil, thin pass 5 to 10 times, then add 2 parts by weight of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (curing agent), and mix After uniformity, thin pass the next film.

[0033] (3) Put the kneaded silicone rubber into a suitable mold, and vulcanize at 175°C and 10MPa for 10min. The second-stage vulcanization was treated in a blast oven at 200°C...

Embodiment 3

[0035] (1) configure the ethanol dispersion containing expanded graphite mass fraction of 10wt%, then put it into an ultrasonic cell pulverizer, process it for 24h under the condition of 500W, carry out vacuum suction filtration to the gained solution, remove the solution, and the gained sample is vacuum-dried use.

[0036] (2) 80 mass parts of silicone rubber raw rubber is dropped into a double-roll mill, and the processing temperature is at 25° C., and then 30 mass parts are added, and the expanded graphite processed in step (1), 20 mass parts of formazan with a viscosity of 500cs Base silicone oil (25°C), thin pass 5-10 times, then add 2 mass parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (curing agent), knead After uniformity, thin pass the next film.

[0037] (3) Put the kneaded silicone rubber into a suitable mold, and vulcanize at 175°C and 10MPa for 10min. The second-stage vulcanization was treated in a blast oven at 200°C for 4 hours to obtain thermally condu...

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Abstract

The invention relates to a method for preparing a high-heat-conducting silicon rubber compound material. The method comprises the following steps of: (1) mixing a substrate, a heat conducing filler and a sufficient amount of vulcanizing agent under the room temperature condition to obtain a mixed sizing material; and (2) performing two-stage vulcanization on the mixed sizing material obtained in the step (1) to obtain a target product, wherein the substrate is a crude silicon rubber or a mixture consisting of silicon rubber and silicon oil; the crude silicon rubber is siloxane containing vinyl of which the molecular weight is 100,000-1,000,000; the heat conducting filler is a carbon-series filler, which is expansion graphite or a mixture mainly comprising expansion graphite, carbon black, graphite, a carbon nanotube, grapheme, fullerene, or / and carbon fibers; and the heat conducting filler is required to be subjected to dispersing pretreatment. Due to the adoption of the method, the heat conductivity of the silicon rubber can be increased effectively, the filling amount of the heat conducting filler can be reduced, and the hardness of an obtained material is lowered.

Description

technical field [0001] The invention relates to a method for preparing heat-conducting silicone rubber, in particular to a method for preparing heat-conducting silicone rubber with high-temperature vulcanized silicone rubber as a matrix. Background technique [0002] Silicone rubber is usually used as a matrix material for thermal interface materials due to its good weather resistance, chemical corrosion resistance and good temperature stability. However, due to the low thermal conductivity of silicone rubber itself (about 0.15-0.2W / m·K), it is not suitable to be directly used as a thermal interface material. In order to improve the thermal conductivity of silicone rubber, a large number of thermally conductive fillers are usually filled into silicone rubber to improve its thermal conductivity. [0003] In the prior art, the thermally conductive fillers used include metal powders such as aluminum powder or silver powder, and aluminum oxide, boron nitride or aluminum nitride...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/04C09K5/14C08K9/00C08K7/24C08K3/04C08K7/00C08K7/06
Inventor 李秋影王纪斌吴驰飞倪露萍彭龙泉郭卫红许海燕
Owner EAST CHINA UNIV OF SCI & TECH
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