Mixed filling type thermal conductive silicone rubber composite and preparation method thereof

A technology of heat-conducting silicone rubber and composite materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of small thermal conductivity and achieve the effect of improving thermal conductivity and high thermal conductivity

Inactive Publication Date: 2011-10-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a mixed filling type thermally conductive silicone rubber composite material and its preparation method. By using SiC and AlN powders with different particle sizes to mix and fill, a thermally conductive silicone rubber composite material with excellent thermal conductivity can be obtained, which can solve the current problems. There is a problem that the thermal conductivity of thermally conductive silicone rubber materials is generally small

Method used

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  • Mixed filling type thermal conductive silicone rubber composite and preparation method thereof
  • Mixed filling type thermal conductive silicone rubber composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 100 parts by mass of methyl vinyl silicone rubber raw rubber with a vinyl molar fraction of 0.13% to 0.22% to the rollers of the double-roll mill, and add 10 parts by mass of precipitated white carbon black after wrapping the rolls, Then add 2 parts by mass of hydroxyl silicone oil, followed by 100 parts by mass of filler and γ-aminopropyltriethoxysilane accounting for 2% of the filler mass. The thermally conductive filler is a mixed powder of SiC and AlN, wherein the SiC powder The average particle size of AlN powder is 10 μm, the average particle size of AlN powder is 1 μm, and the mass ratio of SiC and AlN is 3:1. Repeatedly knead until uniform, and finally add 2 parts by mass of bis-2,5 vulcanizing agent, continue to knead evenly, and obtain the silicone rubber compound.

[0022] Put the kneaded silicone rubber into the mold, and after filling the mold with cold pressure, place the mold on a flat vulcanizer for a stage of vulcanization. The vulcanization tempera...

Embodiment 2

[0026] Add 100 parts by mass of methyl vinyl silicone rubber raw rubber with a vinyl molar fraction of 0.13% to 0.22% to the rollers of the double-roll mill, and add 10 parts by mass of precipitated white carbon black after wrapping the rolls, Then add 2 parts by mass of hydroxyl silicone oil, followed by 200 parts by mass of filler and γ-aminopropyl triethoxysilane accounting for about 2% of the filler mass. The thermally conductive filler is a mixed powder of SiC and AlN, wherein the SiC powder The average particle size of AlN powder is 10 μm, the average particle size of AlN powder is 1 μm, and the mass ratio of SiC and AlN is 3:1. Repeatedly knead until uniform, and finally add 2 parts by mass of bis-2,5 vulcanizing agent, continue to knead evenly, and obtain the silicone rubber compound;

[0027] Put the kneaded silicone rubber into the mold, and after filling the mold with cold pressure, place the mold on a flat vulcanizer for a stage of vulcanization. The vulcanization ...

Embodiment 3

[0031] Add 100 parts by mass of methyl vinyl silicone rubber dust with a vinyl mole fraction of 0.13% to 0.22% to the rollers of the double-roll mill, and add 10 parts by mass of precipitated white carbon black after wrapping the rolls. Then add 2 parts by mass of hydroxyl silicone oil, followed by 200 parts by mass of filler and vinyltriethoxysilane accounting for 2% of the filler mass. The thermally conductive filler is a mixed powder of SiC and AlN, and the average particle size of the SiC powder is The diameter is 10 μm, the average particle size of AlN powder is 1 μm, and the mass ratio of SiC and AlN is 3:1. Repeatedly knead until uniform, and finally add 2 parts by mass of bis-2,5 vulcanizing agent, continue to knead evenly, and obtain the silicone rubber compound;

[0032] Put the kneaded silicone rubber into the mold, and after filling the mold with cold pressure, place the mold on a flat vulcanizer for a stage of vulcanization. The vulcanization temperature is 162°C,...

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Abstract

The invention discloses a preparation method of a mixed filling type thermal conductive silicone rubber composite. Raw materials comprises the following components, by mass, 100 parts of raw silicone rubber, 10 parts of white carbon black, 1 to 3 parts of hydroxy silicone oil, 100 to 200 parts of a thermal conductive filler, 2 to 4 parts of a silane coupling agent and 2 parts of a di-2,5-vulanizator. The preparation method comprises the following steps: adding raw silicone rubber to a double roller mill; adding white carbon black, the thermal conductive filler, the silane coupling agent and hydroxy silicone oil according to a formula design after roller packaging; adding a peroxide vulcanizer after repeatedly and uniformly mixing; mixing uniformly to obtain mixed silicone rubber; putting in a die and carrying out first-stage vulcanization after cold pressing mold filling; and putting a molded sample in an air blasting drier and carrying out second-stage vulcanization to obtain a finished product. In the present invention, mixed particles of SiC and AlN are employed to fill high temperature vulcanized silicon rubber, effective thermal conductive net chains are formed in silicone rubber matrixes, so the obtained heat-conducting silicone rubber composite material has a good heat conducting performance.

Description

technical field [0001] The invention relates to a preparation method of a high thermal conductivity composite material. Specifically, two different types of fillers are used to mix and fill silicone rubber raw rubber, thereby obtaining a preparation method of a high thermal conductivity silicone rubber composite material, which belongs to the high thermal conductivity Molecular composite technology field. Background technique [0002] Materials obtained by filling polymers with inorganic fillers have good thermal conductivity, are cheap, easy to process and shape, and can be used in some special fields after proper processing. In recent years, they have received extensive attention and research. Among them, thermally conductive insulating rubber plays an irreplaceable role in the field of electronic and electrical components, and is used for sealing, shock absorption and heat dissipation, which conforms to the trend of miniaturization of electronic products. At present, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L83/07C08L83/06C08K13/02C08K3/36C08K3/34C08K3/28C09K5/14B29C35/02
Inventor 万怡灶苗影李群英罗红林
Owner TIANJIN UNIV
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