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High-thermal-conductivity graphene film and preparation method thereof

A high thermal conductivity graphite and graphene film technology, applied in the field of thermal conductive materials, can solve the problems of heavy metal film, low thermal conductivity, and large time consumption.

Pending Publication Date: 2021-07-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal thin films have disadvantages such as heavy weight, easy corrosion, and low thermal conductivity, while graphite calendered films and graphitized polyimide films are brittle and easy to drop powder during use, so they are not suitable for precision coatings with complex structures and high cleanliness requirements. Instrument management field
On the other hand, the traditional graphitized polyimide film is usually produced by batch operation, and the graphitization process needs to consume a lot of time (heating time is at least 6-10h, cooling time is at least 10h) and energy (the energy consumption of the experimental furnace is at least 50~70KW / h)

Method used

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  • High-thermal-conductivity graphene film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] ①Mix 6g of graphene oxide and 24g of hardwood fiber raw materials, and dilute the mixed slurry with water to a concentration of 10%. The mass of graphene oxide accounts for 20% of the total mass of fiber raw materials and graphene oxide, and mix them into a PFI disc refiner Refining is carried out to obtain a mixed slurry of graphene oxide and fibers, and the degree of beating is 45°SR.

[0033] ②①Add 15g of polyvinyl alcohol to the prepared mixed slurry, the mass concentration of the added polyvinyl alcohol is 5%, and carry out vacuum filtration to obtain a graphene oxide film (GO film).

[0034] ③Put the GO film prepared in ② into a vacuum drying oven to dry for 2 hours to obtain a dried GO film at a drying temperature of 80°C;

[0035] ④ Put the dried GO film obtained in ③ into a tube furnace for carbonization treatment. During the carbonization process, first raise the temperature to 300°C, keep it for 40 minutes, continue to raise the temperature to 500°C, keep it ...

Embodiment 2

[0040] ①Mix 12g of graphene oxide and 18g of hardwood fiber raw materials, and dilute the mixed slurry with water to a concentration of 10%. The mass of graphene oxide accounts for 40% of the total mass of fiber raw materials and graphene oxide, and mix them into a PFI disc refiner Refining is carried out to obtain a mixed slurry of graphene oxide and fibers, and the degree of beating is 45°SR.

[0041] ②① Add 15 g of polyvinyl alcohol to the prepared mixed slurry, and add polyvinyl alcohol with a mass concentration of 5%, and perform vacuum filtration to obtain a graphene oxide film (GO film).

[0042] ③Put the GO film prepared in ② into a vacuum drying oven to dry for 2 hours to obtain a dried GO film at a drying temperature of 80°C;

[0043] ④ Put the dried GO film obtained in ③ into a tube furnace for carbonization treatment. During the carbonization process, first raise the temperature to 300°C, keep it for 40 minutes, continue to raise the temperature to 500°C, keep it f...

Embodiment 3

[0047] ①Mix 18g of graphene oxide and 12g of hardwood fiber raw material, dilute the mixed slurry with water to a concentration of 10%, the mass of graphene oxide accounts for 60% of the total mass of fiber raw material and graphene oxide, mix and put into PFI disc mill The machine is used for refining to obtain a mixed slurry of graphene oxide and fiber, and the degree of beating is 45°SR.

[0048] ②①Add 18g of polyvinyl alcohol to the prepared mixed slurry, the mass concentration of the added polyvinyl alcohol is 6%, and carry out vacuum filtration to obtain a graphene oxide film (GO film).

[0049] ③Put the GO film prepared in ② into a vacuum drying oven to dry for 2 hours to obtain a dried GO film at a drying temperature of 80°C;

[0050] ④ Put the dried GO film obtained in ③ into a tube furnace for carbonization treatment. During the carbonization process, first raise the temperature to 300°C, keep it for 30 minutes, continue to raise the temperature to 500°C, keep it for 3...

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Abstract

The invention discloses a high-thermal-conductivity graphene film and a preparation method thereof, and belongs to the technical field of thermal conductive materials. The graphene oxide adopted by the invention can be uniformly dispersed in water. The preparation method comprises the following steps: mixing graphene oxide and fibers, grinding, permeating the graphene oxide into the fibers, firmly combining the graphene oxide with the fibers, adding a certain amount of a binder into the mixed slurry of the graphene oxide and the fibers, and carrying out vacuum filtration to obtain a graphene oxide film; and performing high-temperature carbonization and graphitization in the later stage to obtain the graphene heat-conducting film with high heat conductivity and high flexibility. The graphene heat-conducting film can be prepared through a simple preparation process, and the preparation method is low in cost, controllable in thickness, simple to operate, high in production efficiency and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of thermally conductive materials, in particular to a method for preparing a high thermally conductive graphene film. Background technique [0002] In recent years, with the continuous miniaturization and integration of electronic systems, their performance and reliability will be more and more subject to the problem of heat conduction. The requirements are also getting stricter. Excessive heat generation and power dissipation will greatly affect the service life and stability of electronic components. Traditional heat-conducting materials are mainly metal thin films, graphite calendered films, and graphitized polyimide films. Metal thin films have disadvantages such as heavy weight, easy corrosion, and low thermal conductivity, while graphite calendered films and graphitized polyimide films are brittle and easy to drop powder during use, so they are not suitable for precision coatings with complex structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B32/19
Inventor 王习文李仁坤
Owner SOUTH CHINA UNIV OF TECH
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