A kind of graphene thick film with high thermal conductivity and preparation method thereof

A high thermal conductivity graphite and graphene film technology, applied in the direction of graphene, nano-carbon, etc., can solve problems such as unevenness and large spacing between graphene sheets, and achieve improved orientation, smooth thermal conduction channels, and high thermal conductivity. Effect

Active Publication Date: 2019-09-03
HANGZHOU GAOXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, at present, the macro-assembled graphene film with high thermal conductivity usually has a thickness of 5 μm to 30 μm, and the graphene thick film or graphene block with a thickness of more than a few hundred microns is due to the large or uneven spacing of the graphene sheets. , its thermal conductivity is usually only 400 ~ 800W / mK

Method used

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  • A kind of graphene thick film with high thermal conductivity and preparation method thereof
  • A kind of graphene thick film with high thermal conductivity and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Graphene oxide with an average size greater than 50 μm is formulated into a graphene oxide aqueous solution with a concentration of 7 mg / mL, and a graphene oxide solution with a thickness of 5 mm is spread to form a film by a scraping film method, and then dried naturally to obtain a graphene oxide film.

[0024] (2) Composite two graphene oxide films with a size of 8cm*8cm by liquid coating, specifically: uniformly coat a layer of graphene oxide aqueous solution with a concentration of 4mg / mL on the surface of the graphene oxide film, and then Bond multiple graphene oxide films together along the thickness direction.

[0025] (3) Place the bonded graphene oxide composite film in an oven for drying, and the temperature of the oven is 40°C.

[0026] (4) Place the dried graphene oxide composite and the original graphene film in the hot-pressing chamber of the hot-pressing machine, heat up to 200°C at a rate of 2°C / min, and then heat-press, and repeat the following hot...

Embodiment 2

[0030] (1) Graphene oxide with an average size greater than 50 μm is formulated into a graphene oxide aqueous solution with a concentration of 7 mg / mL, and a graphene oxide solution with a thickness of 5 mm is spread to form a film by a scraping film method, and then dried naturally to obtain a graphene oxide film.

[0031](2) Coating ten graphene oxide films with a size of 8cm*8cm with different liquids for compounding, specifically: uniformly spray deionized water on the surface of the graphene oxide film to make the surface swell, and then multiple sheets The graphene oxide film is bonded together along the thickness direction, and the sample made by this method is marked as sample A; a layer of graphene oxide aqueous solution with a concentration of 4mg / mL is uniformly coated on the surface of the graphene oxide film, and then multiple sheets The graphene oxide film is bonded together along the thickness direction, and the sample made by this method is marked as sample B. ...

Embodiment 3

[0037] (1) Graphene oxide with a high degree of oxidation and a graphene oxide with a low degree of oxidation with an average size greater than 50 μm were respectively prepared into a 7 mg / mL graphene oxide aqueous solution, and the graphene oxide solution with a thickness of 5 mm was paved by the scraping film method. After the film is dried naturally, a graphene oxide film with a high degree of oxidation and a graphene oxide film with a low degree of oxidation are obtained.

[0038] (2) Composite ten graphene oxide films with a high degree of oxidation and graphene oxide films with a low degree of oxidation respectively, specifically: spray deionized water evenly on the surface of the graphene oxide film to make the surface swell, and then apply Multiple graphene oxide films are bonded together along the thickness direction. The graphene oxide film can be self-bonded by the force at the bonding interface, and a graphene oxide composite film with a high degree of oxidation an...

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Abstract

The invention discloses a high-thermal conductivity graphene thick film and a preparation method thereof. The preparation method comprises uniformly spraying a layer of liquid onto the surface of every graphene oxide film; after the surface swells, bonding a plurality of the graphene oxide films together, which can achieve self-bonding under acting force of bonding interfaces after being dried; performing further low-temperature hot pressing so that bonding between every two layers of graphene oxide films can be more compact; performing low-temperature heating prereduction and high-temperature and high-pressure heat treatment to repair defects and further to obtain the high-thermal conductivity graphene composite film. The composite thickness of the high-thermal conductivity graphene composite film is greater than 50 mu m, the plane thermal conductivity of the high-thermal conductivity graphene composite film is greater than 1000-2000 W/mK, so that the high-thermal conductivity graphene composite film has a great application prospect in high-frequency and high-current density devices.

Description

technical field [0001] The invention relates to novel heat-conducting materials and methods, in particular to a high-heat-conducting graphene thick film and a preparation method thereof. Background technique [0002] In 2010, two professors Andre GeiM and Konstantin Novoselov from the University of Manchester won the Nobel Prize in Physics for their first successful separation of stable graphene, which set off a wave of research on graphene around the world. Graphene, also known as single-layer graphite, is a flat film composed of carbon atoms, peeled off from graphite material, only one carbon atom thick, and is a two-dimensional structure formed by a single layer of carbon atoms arranged in a honeycomb lattice. Material. The structure of graphene is very stable, the carbon-carbon bond (carbon-carbon bond) is only The connection between carbon atoms inside graphene is very flexible. When an external force is applied to graphene, the surface of the carbon atoms will bend ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/182C01B32/184
Inventor 高超郭燕
Owner HANGZHOU GAOXI TECH CO LTD
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