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

A high thermal conductivity graphite and graphene composite technology, applied in graphene, chemical instruments and methods, modification by conduction and heat transfer, etc., can solve the problem of low product yield, low production efficiency, and inability to continuously produce roll-shaped films, etc. problems, to achieve the effect of improving product yield and high thermal conductivity

Active Publication Date: 2021-09-24
CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through comparative analysis and actual production experience, it is found that the current technology has the following problems: it is difficult to peel off the graphene coating on the substrate, the product yield is low, and the efficiency is low; the size and process of preparing the film are difficult for large-scale production and application; it cannot be continuous Production of roll-shaped film, low production efficiency

Method used

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Examples

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preparation example Construction

[0030] The invention provides a kind of preparation method of high thermal conductivity graphene film, comprises the following steps:

[0031] A) The polyamic acid resin and graphene oxide solution are coated on the surface of the substrate in sequence, and the graphene oxide composite film is obtained after drying;

[0032] B) peeling the graphene oxide composite film from the substrate to obtain a continuous graphene oxide composite film coil;

[0033] C) heat-treating the graphene oxide composite film coil to obtain a carbonized graphene oxide composite film;

[0034] D) Graphitizing the carbonized graphene oxide composite film to obtain a graphene film with high thermal conductivity.

[0035] The present invention preferably prepares polyamic acid resin according to the following method:

[0036] Polycondensation reaction of dianhydride and diamine in a strong polar solvent to obtain polyamic acid resin;

[0037] Described dianhydride is preferably one or more in biphen...

Embodiment 1

[0059] It is formulated by polycondensation reaction of biphenyl tetra-acid dianhydride (BPDA), benzophenone tetra-acid dianhydride (BTDA), diaminodiphenyl ether (ODA), and p-phenylenediamine (PPDA) in a strong polar solvent DMAC. A polyimide acid (PAA) matrix resin with a solid content of 20%;

[0060] Use vacuum ultrasonic stirring disperser to disperse graphene oxide powder in the NMP containing PVA, form uniform graphene oxide slurry and carry out vacuum defoaming; Wherein the concentration of graphene oxide in the prepared graphene oxide slurry is: 5wt%, viscosity is 10000cPs, organic surfactant content is 0.02wt%

[0061] Pass the above polyimide acid matrix resin and graphene oxide solution through the coating head with double feeding and double coating ports, and sequentially coat the polyimide acid and graphene oxide solution on the substrate to form a certain thickness of oxide film. The graphene composite film is dried in a coating machine oven to remove solvent an...

Embodiment 2

[0068] It is formulated by polycondensation reaction of biphenyl tetra-acid dianhydride (BPDA), benzophenone tetra-acid dianhydride (BTDA), diaminodiphenyl ether (ODA), and p-phenylenediamine (PPDA) in a strong polar solvent DMAC. A polyimide acid (PAA) matrix resin with a solid content of 15%;

[0069] Use vacuum ultrasonic stirring disperser to disperse graphene oxide powder in the NMP containing PVA, form uniform graphene oxide slurry and carry out vacuum defoaming; Wherein the concentration of graphene oxide in the prepared graphene oxide slurry is: 7wt%, viscosity is 20000cPs, organic surfactant content is 0.03wt%

[0070] Pass the above polyimide acid matrix resin and graphene oxide solution through the coating head with double feeding and double coating ports, and sequentially coat the polyimide acid and graphene oxide solution on the substrate to form a certain thickness of oxide film. The graphene composite film is dried in a coating machine oven to remove solvent an...

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Abstract

The invention provides a high thermal conductivity graphene film and a preparation method thereof, comprising the following steps: A) sequentially coating polyamic acid resin and graphene oxide solution on the surface of a substrate, and obtaining a graphene oxide composite film after drying; B ) peeling off the graphene oxide composite film from the base material to obtain a continuous graphene oxide composite film coil; C) heat-treating the graphene oxide composite film coil to obtain a carbonized graphene oxide composite film ; D) graphitizing the carbonized graphene oxide composite film to obtain a graphene film with high thermal conductivity. In the present invention, polyamic acid resin and graphene oxide solution are sequentially formed into films to form a structure in which two layers of graphene oxide film and polyamic acid film are superimposed, so that the high thermal conductivity of graphene can be more fully exerted, and at the same time, it can be peeled off to obtain more The thick graphene film can meet the special needs of the aerospace field, and also improve the product yield of exfoliated graphene.

Description

technical field [0001] The invention belongs to the technical field of thermally conductive materials, and in particular relates to a graphene film with high thermal conductivity and a preparation method thereof. Background technique [0002] Graphite is an allotrope formed by carbon elements. Due to its perfect molecular structure, it has unique thermal, electrical, chemical and other properties, and can be widely used in industries such as electronics and heat dissipation. The currently prepared high thermal conductivity graphite film with a plane thermal conductivity of 800~1500W / m.K solves the local overheating problem of low power chips such as mobile phones. However, as the performance of electronic equipment is getting better and better, the processing speed and frequency are getting higher and higher. The volume and weight are getting higher and higher, the power is getting bigger and bigger, the heat generation of electronic equipment is getting bigger and bigger, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/192C01B32/19C01B32/184C01B32/182
CPCC04B35/522C04B35/524C04B35/62218C04B2235/656C04B2235/6567C04B2235/658C04B2235/77C04B2235/96C04B2235/9607H05K7/2039
Inventor 聂爽吕新坤古文正任大磊肖成城黎雪峰
Owner CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD