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Graphene-containing silicon rubber heat-conducting composite material and preparation method thereof

A thermally conductive composite material and graphene technology, applied in the field of thermally conductive polymer composite materials, can solve problems such as the deterioration of mechanical properties of silicone rubber, and achieve the effect of improving thermal conductivity

Active Publication Date: 2015-02-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a graphene-containing silicone rubber heat-conducting composite material capable of giving full play to the advantages of graphene heat-conducting properties and a preparation method thereof, to solve the problem existing in the prior art that in order to obtain excellent heat-conducting properties, it is necessary The problem of severe deterioration of the mechanical properties of silicone rubber due to the addition of a large amount of inorganic thermally conductive fillers

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  • Graphene-containing silicon rubber heat-conducting composite material and preparation method thereof
  • Graphene-containing silicon rubber heat-conducting composite material and preparation method thereof
  • Graphene-containing silicon rubber heat-conducting composite material and preparation method thereof

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preparation example Construction

[0042] The preparation method of the above-mentioned graphene / inorganic heat-conducting filler composite heat-conducting silicone rubber material is as follows: firstly, on a double-roll mill, inorganic heat-conducting fillers, graphene, cross-linking agents and other additives are mixed evenly with silicone rubber to obtain heat-conducting silicone rubber pre-mixed. Polymer. Then put the above-mentioned prepolymer on a flat vulcanizing machine for hot pressing to obtain a section of vulcanized heat-conducting silicone rubber. Then put the above-mentioned one-stage vulcanization product into an oven for two-stage vulcanization, and finally obtain the composite heat-conducting silicone rubber. The method specifically includes the following steps:

[0043] (1) Preparation of surfactant-treated graphene: first surfactant is added to deionized water, surfactant by weight: water=0.1~3:100, to obtain an aqueous solution containing surfactant; then under stirring condition Add grap...

Embodiment 1

[0051] In this embodiment, a graphene / aluminum oxide composite thermally conductive silicone rubber composite material is prepared, and the content of graphene in the composite thermally conductive film material is 5.0 wt%.

[0052] First, add 10 grams of methyl vinyl silicone rubber to the double-roller mill and mix evenly, then add 3 grams of fumed silica, 45 grams of aluminum oxide treated with silane coupling agent KH-550 and silane 3.0 grams of graphene treated with coupling agent KH-550, 0.20 grams of cross-linking agent 2,5-dimethyl-2,5 di-tert-butylperoxyhexane (double 2,5), etc. are mixed until uniform to obtain thermal conductivity Silicone rubber prepolymer. The obtained heat-conducting silicone rubber prepolymer was placed on a flat vulcanizing machine and hot-pressed at 165° C. and 10 MPa for 10 minutes to obtain a stage of vulcanized heat-conducting silicone rubber. Then put the obtained one-stage vulcanized heat-conducting silicone rubber into an oven for two-s...

Embodiment 2

[0055] In this embodiment, a graphene / aluminum oxide composite thermally conductive silicone rubber composite material is prepared, and the content of graphene in the composite thermally conductive film material is 3.3 wt%. Other preparation methods are the same as in Embodiment 1, and the measured thermal conductivity of the composite thermally conductive silicone rubber is 2.28w / m·k (40°C).

[0056] like image 3 As shown, it can be seen from the scanning electron microscope photo of the graphene / aluminum oxide composite thermally conductive silicone rubber material that graphene and aluminum oxide are evenly distributed in the silicone rubber and form a composite thermally conductive network.

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Abstract

The invention relates to the field of heat-conducting high-polymer composite materials, particularly a graphene-containing silicon rubber heat-conducting composite material and a preparation method thereof. The heat-conducting composite material is mainly composed of graphene, an inorganic heat-conducting filler and a silicon rubber matrix, wherein the graphene accounts for 0.1-10 wt% of the silicon rubber heat-conducting composite material, and the graphene constitutes a heat-conducting network in the heat-conducting composite material. The method comprises the following steps: uniformly compounding the inorganic heat-conducting filler, graphene, crosslinking agent and other assistants and silicon rubber on a double-roll open mill to obtain a heat-conducting silicon rubber prepolymer; and carrying out primary vulcanization on the prepolymer on a flat vulcanizing machine, and carrying out secondary vulcanization in a drying oven to finally obtain the composite heat-conducting silicon rubber. Since the two-dimensional graphene has large thickness-diameter ratio and can easily constitute an effective heat-conducting network in the silicon rubber, a small amount of two-dimensional graphene can obviously enhance the heat-conducting property of the silicon rubber (the heat conductivity coefficient at 40 DEG C is 4.98 W / m.K). The silicon rubber composite heat-conducting material can be widely used in the field of heat dissipation of electronic products.

Description

technical field [0001] The invention relates to the field of heat-conducting polymer composite materials, in particular to a silicone rubber heat-conducting composite material containing graphene and a preparation method thereof. Background technique [0002] With the development of modern electronics industry, information industry and high-tech, especially with the miniaturization, densification, and power increase of microelectronic devices, the problem of heat dissipation of devices has become increasingly important. In order to meet the higher and higher requirements, it is hoped to obtain materials with good thermal conductivity to meet actual needs. As a functional polymer material, thermally conductive silicone rubber composite materials have attracted great attention from scientists and entrepreneurs from all over the world. In recent years, theoretical and practical research has progressed rapidly. [0003] Silicone rubber-based thermally conductive composite mater...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08K13/06C08K3/22C08K3/38C08K3/28C08K3/36C08K5/14
Inventor 英哲方明赫王函马超群曾尤任文才成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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