Graphene heat-conducting silicone grease and preparation method thereof
A technology of thermal conductive silicone grease and graphene, which is applied in the field of graphene thermal conductive silicone grease and its preparation, can solve the problems of poor thermal conductivity and achieve good thermal conductivity
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[0030] The embodiment of the present invention also provides a preparation method of graphene thermally conductive silicone grease, comprising the following steps:
[0031] (1) Graphene and organic silicon containing benzene rings are mixed to obtain a mixture, and the graphene is graphene microflakes or graphene powder. In a preferred embodiment, the organosilicon containing benzene ring and graphene are mixed in a weight ratio of (1-20): 1, and ultrasonically stirred while stirring, and the carbon-oxygen ratio of graphene is controlled at (8-50): 1 .
[0032] (2) Add other thermally conductive fillers and additives to the mixture.
[0033] In a preferred embodiment, the weight ratio of the benzene ring-containing silicone to the graphene is (1-10):1, preferably 1-5:1.
[0034] In a preferred embodiment, the carbon to oxygen ratio of graphene is (8-50):1. Reasonable control of the carbon-to-oxygen ratio of graphene, combined with a reasonable proportion of organic silicon ...
Embodiment 1
[0054] Preparation of graphene thermally conductive material:
[0055] (1) Mix 57 parts of phenyl silicone oil with a viscosity of 200 mps and 30 parts of graphene powder with a carbon-to-oxygen ratio of 20:1, and ultrasonicate while stirring.
[0056] (2) The temperature is controlled at 60°C-80°C, and 0.5 parts of tetrapropylammonium hydroxide is added. Continue to stir and sonicate for 2h-10h.
[0057] (3) Silicon hydrogen compound (43 parts of diphenylmethylsilane) is added, so that the ratio of the number of moles of Si-H bonds to the number of moles of oxygen atoms on the graphene material is (0.8-1.6):1. Nitrogen gas was introduced, and the stirring was continued for 0.5h-3h, during which the temperature was kept at 25°C-40°C.
[0058] (4) Turn off the ultrasound, raise the temperature to 80°C-150°C, vacuumize for 2h-5h, remove volatiles, and obtain a graphene heat-conducting material.
[0059] Preparation of thermal grease:
[0060] (5) Add other thermally conducti...
Embodiment 2
[0062] (1) Mix 80 parts of phenyl silicone oil with a viscosity of 200 mps and 30 parts of graphene powder with a carbon-to-oxygen ratio of 10:1, and ultrasonicate while stirring.
[0063] (2) The temperature is controlled at 60°C-80°C, and 0.5 parts of tetrapropylammonium hydroxide is added.
[0064] (3) adding silicon hydrogen compound (20 parts of diphenylsilane), so that the ratio of the number of moles of Si-H bonds to the number of moles of oxygen atoms on the graphene material is (0.8-1.6):1. Nitrogen gas was introduced, and the stirring was continued for 0.5h-3h, during which the temperature was kept at 25°C-40°C.
[0065] (4) Turn off the ultrasound, raise the temperature to 80°C-150°C, vacuumize for 2h-5h, remove volatiles, and obtain a graphene heat-conducting material.
[0066] Preparation of thermal grease:
[0067] (5) Add other thermally conductive fillers (average particle diameter is the alpha spherical alumina of 20 μ m), auxiliary agent (polyether type def...
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