Directionally arranged graphene super high heat conductivity composite material, and preparation method thereof

Abstract

The invention discloses a directionally arranged graphene super high heat conductivity composite material, and a preparation method thereof. The directionally arranged graphene super high heat conductivity composite material is composed of non-oxidation reduction graphene nanometer sheet, a high molecular matrix, a dispersant, and a couplant through combination; gradient magnetic field is appliedso as to realize internal directional arrangement of the non-oxidation reduction graphene nanometer sheet in the high molecular matrix. According to the preparation method, full utilization of graphene surface internal high heat conductivity characteristics is adopted, directional arrangement is realized under the graphene landau diamagnetism action; when the adding amount is equal, the heat conductive performance of the obtained is much better than that of other doped graphene materials or common graphene mixed materials.

Description

technical field [0001] The invention relates to the technical field of thermally conductive materials, in particular to an aligned graphene superhigh thermal conductivity composite material and a preparation method thereof. Background technique [0002] The problem of heat conduction has always been a topic of urgent concern in the field of electronics industry and materials. At present, most of the commonly used heat conduction materials are metal materials such as copper and aluminum. The advantages of high insulation have been tried to be applied to related products in the fields of LED and lithium battery heat dissipation. At present, most of the published patents related to thermally conductive plastics use metal oxide ceramic powder, carbon fiber and graphite as dopants. , the doping amount is limited (too high carbon fiber and graphite doping amount will lead to the improvement of its electrical conductivity) and other factors lead to the thermal conductivity of the ...

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Problems solved by technology

On the one hand, graphene prepared by chemical vapor deposition has the problem of high yield and low cost. On the other hand, a more important problem is that graphene, as a plane two-dimensional material, has a high thermal conductivity only in-plane thermal conductivity, while vertical The thermal conductivity in the graphene plane direction is extremely small, less than 10W / (m·K). Therefore, due to the extremely small thermal conductivity in the non-basal plane direction of the randomly distributed graphene nanosheets, the overall thermal conductivity will inhibit each other and Offset, the graphene composite plastics prepared by this method cannot fully utilize the high thermal conductivity of graphene so that the thermal conductivity of the composite material is greatly limited

The thermal conductivity of the graphene composite thermally conductive plastic prepared by the method disclosed in the patent 201410673428.2 is less than 20W / (m·K)

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