High-heat-conductivity graphene membrane and preparing method thereof

A composite technology of high thermal conductivity graphite and graphene, which is applied in the direction of modification through conduction heat transfer, cooling/ventilation/heating modification, etc., can solve the problems of low product yield, low production efficiency, low efficiency, etc., and improve product quality. The effect of high efficiency and high thermal conductivity

Active Publication Date: 2019-04-19
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 i

Method used

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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 the graphene oxide solution are coated on the surface of the substrate successively, and the graphene oxide composite film is obtained after drying;

[0032] B) peeling off 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 ...

Embodiment 1

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

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

[0061] The above-mentioned polyimide acid base resin and graphene oxide solution are passed through the coating head of the double feed double coating port, and the polyimide acid and the graphene oxide solution are sequentially coated on the base material to form a certain thickness of oxidation. The graphene composite film is dried in a coating machine oven to remove the solvent a...

Embodiment 2

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

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

[0070] The above-mentioned polyimide acid base resin and graphene oxide solution are passed through the coating head of the double feed double coating port, and the polyimide acid and the graphene oxide solution are sequentially coated on the base material to form a certain thickness of oxidation. The graphene composite film is dried in a coating machine oven to remove the solvent a...

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PUM

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Abstract

The invention provides a high-heat-conductivity graphene membrane and a preparing method thereof. The method includes the following steps of A, sequentially coating the surface of a base material withpolyamide acid resin and a graphene oxide solution, and conducting drying to obtain a graphene oxide compound membrane; B, stripping off the graphene oxide compound membrane from the base material toobtain a continuous graphene oxide compound membrane coiled material; C, conducting thermal treatment on the continuous graphene oxide compound membrane coiled material to obtain a carbonized continuous graphene oxide compound membrane; D, conducting graphitization treatment on the carbonized continuous graphene oxide compound membrane to obtain the high-heat-conductivity graphene membrane. The polyamide acid resin and the graphene oxide solution are sequentially formed into membranes, the structure of overlapping the graphene oxide membrane and the polyamide acid membrane is formed, the highheat conductivity of graphene can be more sufficiently realized, meanwhile the thicker graphene membrane can be obtained through stripping, the special requirements in the aerospace field can be met,and meanwhile the product yield of the stripped graphene is improved.

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. At present, the high thermal conductivity graphite film with a planar 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, and th...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/524C04B35/622H05K7/20
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
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