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Heat-conducting graphite membrane and preparation method

A heat-conducting graphite film, graphene micro-sheet technology, applied in graphene, nano-carbon and other directions, can solve problems such as uneven distribution of film, plane thermal conductivity of graphite film needs to be further improved, etc. Good thermal diffusivity

Active Publication Date: 2013-11-13
XIAMEN KNANO GRAPHENE TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to provide a thermally conductive graphite film to solve the problems in the prior art that the compactness of the film is unevenly distributed along the thickness direction and the thermal conductivity in the plane of the graphite film needs to be further improved

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take graphene microchip 5kg, join in high-speed mixer, be 99.7:0.3 ratio according to graphene microchip and sodium silicate weight percentage, adopt the method for spraying while stirring to add sodium silicate water glass solution to graphene microchip The sheet is wetted, mixed and stirred evenly, and the mixed and wetted material is added to the rolling equipment and rolled into a film.

[0029] By adjusting the parameters such as feeding speed, roll pressure, and roll pitch, a thermally conductive graphite film with a thickness of 0.01mm can be obtained, and then the calendered thermally conductive graphite film is dried at high temperature.

[0030] The thermal conductivity was tested by laser method. The thermal conductivity of the thermal graphite film in the plane is 1500W / mk, and the thermal conductivity in the thickness direction is 30W / mk.

Embodiment 2

[0032] Take graphene microchip 5kg, join in high-speed mixer, be 99.5:0.5 ratio according to graphene microchip and sodium silicate weight percentage, adopt the method for spraying while stirring to add sodium silicate water glass solution to graphene microchip The sheet is wetted, mixed and stirred evenly, and the mixed and wetted material is added to the rolling equipment and rolled into a film.

[0033] By adjusting parameters such as feeding speed, roll pressure, and roll pitch, a thermally conductive graphite film with a thickness of 0.03mm can be obtained, and then the calendered thermally conductive graphite film is dried at high temperature.

[0034] The thermal conductivity was tested by laser method. The thermal conductivity of the thermal graphite film in the plane is 1470W / mk, and the thermal conductivity in the thickness direction is 29W / mk.

Embodiment 3

[0036] Get Graphene microchip 5kg, join in high-speed mixer, be 99:1 ratio according to Graphene microchip and aluminum phosphate weight percentage, adopt the method for spraying while stirring to add aluminum phosphate aqueous solution and graphene microchip is wetted, And mix and stir evenly, put the mixed and wetted material into the rolling equipment and roll it into a film shape.

[0037] By adjusting parameters such as feeding speed, roll pressure, and roll distance, a thermally conductive graphite film with a thickness of 0.05mm can be obtained, and then the calendered thermally conductive graphite film is dried at high temperature.

[0038] The thermal conductivity was tested by laser method. The thermal conductivity of the thermal graphite film in the plane is 1480W / mk, and the thermal conductivity in the thickness direction is 26W / mk.

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Abstract

The invention discloses a heat-conducting graphite membrane and a preparation method. The heat-conducting graphite membrane is prepared from 90 to 99.7 wt% of a graphene nanosheet and 0.3 to 10.0 wt% of an inorganic adhesive. The preparation method comprises the following steps: 1) with the graphene nanosheet as a raw material, adding an aqueous inorganic adhesive material to wet the graphene nanosheet and carrying out uniform mixing with stirring; 2) adding a mixed wet material into a rolling unit for calendaring so as to obtain the heat-conducting graphite membrane; and 3) drying the calendared heat-conducting graphite membrane. The preparation method is a novel preparation method for the heat-conducting graphite membrane, can be carried out with a traditional rolling unit to prepare the heat-conducting graphite membrane and has low requirements for the unit, and a rolling process is simple; the prepared graphite membrane has a few air gaps, uniform compactness and high heat conduction performance at two directions respectively parallel and perpendicular to the graphite membrane.

Description

technical field [0001] The invention relates to a graphite film and a preparation method, in particular to a graphite film with heat conduction function and a preparation method. Background technique [0002] At present, the high calorific value of electronic devices has become an increasingly prominent problem. With the development of electronic products in the direction of high integration, high frequency and high efficiency, the heat flux per unit chip of electronic devices has increased rapidly. During the process, a large amount of heat will be generated and needs to be removed in time, otherwise the heat accumulation will cause the operating temperature of the electronic device to rise, which will directly affect the working stability and reliability of the electronic component, and even endanger the semiconductor junction and damage the circuit connection. interface, shortening the service life. This requires a good heat dissipation and cooling system, which can quic...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/182
Inventor 赵卫峰洪江彬方崇卿
Owner XIAMEN KNANO GRAPHENE TECH CORP
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