A kind of preparation method of graphene composite material with high thermal conductivity
A composite material and graphene technology, applied in the direction of heat exchange materials, graphene, chemical instruments and methods, etc., can solve the problems of high graphene materials, poor thermal conductivity, reduce anisotropy, etc., and achieve high thermal conductivity Effect
Active Publication Date: 2022-03-15
INST OF CHEM ENG GUANGDONG ACAD OF SCI
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Problems solved by technology
However, the 3D graphene materials prepared by traditional methods make the graphene curl, thereby reducing the anisotropy and greatly sacrificing the thermal conductivity of graphene in the plane.
If graphene is not crimped in the prior art, the thermal conductivity of the graphene material in the axial direction (the axial direction is the direction perpendicular to the graphene surface) is too poor, that is, the axial and surface cannot be obtained in the prior art. Graphene material with high internal thermal conductivity
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Embodiment 1
[0047] Embodiment 1: the preparation of the graphene composite material of high thermal conductivity
[0048] A preparation method of a graphene composite material with high thermal conductivity, comprising the following steps:
[0049](1) Preparation of nano-silica modified by divinyltriaminopropyltrimethoxysilane: disperse 1.9g nano-silicon dioxide in 300g toluene, then add 3.8g divinyltriaminopropyltrimethoxysilane base silane, mixed, reacted at 120°C for 16 hours, and washed to obtain nano-silica modified by divinyltriaminopropyltrimethoxysilane;
[0050] (2) Preparation of nano-silica-nano-gold composite modified by divinyltriaminopropyltrimethoxysilane: 0.2g of divinyltriaminopropyltrimethoxysilane prepared in step (1) The modified nano-silica was added to 1000 mL of nano-gold solution with a concentration of 1.0 μg / mL and stirred for 2 hours, and then 100 mL of K-Gold solution was added (K-Gold solution was prepared by 1000 mL of 0.3 mg / mL K 2 CO 3 solution and 280mL...
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Abstract
The invention belongs to the field of heat-conducting materials, and discloses a preparation method of a high-heat-conducting graphene composite material. The preparation method comprises the following steps: preparation of nano-inorganic oxide modified by silane coupling agent, preparation of nano-inorganic oxide-nano-metal composite modified by silane coupling agent, and Add surfactant and graphene oxide to the nano-inorganic oxide-nano-metal composite, stir and react, and filter with suction to obtain a filter cake; then soak the filter cake in a solution of reducing agent, react, and filter with suction to obtain a filter cake , you can. The graphene composite material prepared by this preparation method has a three-dimensional space network structure, and has the characteristics of high axial and in-plane thermal conductivity, the in-plane thermal conductivity is greater than 14.8W / (m K), and the axial thermal conductivity is greater than 0.45 W / (m·K), which is higher than the axial thermal conductivity of graphene 0.421W / (m·K).
Description
technical field [0001] The invention belongs to the field of heat-conducting materials, in particular to a method for preparing a high-heat-conducting graphene composite material. Background technique [0002] Sophisticated electronic equipment is rapidly developing in the direction of light weight, miniaturization, multi-function, and high power, which puts forward higher requirements for the thermal conductivity of materials. If the heat cannot be dissipated in time, the service life and working efficiency of the equipment will be reduced, or even malfunction. Therefore, it is of great significance to develop materials with better thermal conductivity. However, the 3D graphene materials prepared by the traditional method make the graphene curl, thereby reducing the anisotropy, and greatly sacrificing the thermal conductivity of the graphene in the plane. If graphene is not crimped in the prior art, the thermal conductivity of the graphene material in the axial direction ...
Claims
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IPC IPC(8): C09K5/14C01B32/19C01B32/194
CPCC09K5/14C01B32/19C01B32/194
Inventor 余越庞浩戴永强张雄洪培萍麦裕良文武廖兵
Owner INST OF CHEM ENG GUANGDONG ACAD OF SCI