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

A technology of high thermal conductivity graphite and composite film, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc. The effect of thermal properties

Active Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has obvious disadvantages, such as high energy consumption, which is inconsistent with the trend of energy conservation and emission reduction; harsh operating conditions, difficult to achieve ultra-high temperature and ultra-high pressure; high production costs, low economic benefits of products, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A high thermal conductivity graphene-based composite film and a preparation method thereof, comprising the following specific steps:

[0038] (1) Preparation of graphene oxide dispersion by modified Hummers method

[0039] Pre-oxidation: uniformly disperse 0.7 g of potassium persulfate and 0.7 g of phosphorus pentoxide into 6 ml of 18 mol L -1 In the concentrated sulfuric acid, add 1 gram of graphite powder, shake evenly, condense and reflux in a water bath at 80°C for 6 hours, cool to room temperature and dilute into 150 ml of deionized water, vacuum filter, rinse with deionized water and ethanol for several Secondary to neutral, dry the solid at 105°C for 4 hours to obtain pre-oxidized graphite;

[0040] Re-oxidation: Mix 1 g of pre-oxidized graphite with 40 ml of 18mol L -1 5 grams of potassium permanganate was slowly added under ice-water bath and stirring conditions to ensure that the temperature of the mixture did not exceed 20°C, and then the temperature was ra...

Embodiment 2

[0048] (1) Preparation of graphene oxide dispersion by modified Hummers method

[0049] Pre-oxidation: Evenly disperse 0.5 g of potassium persulfate and 0.6 g of phosphorus pentoxide into 5 ml of 18 mol L -1 Add 1 g of graphite powder to the concentrated sulfuric acid, shake evenly, condense and reflux in a water bath at 83°C for 5 hours, cool to room temperature and dilute into 120 ml of deionized water, vacuum filter, rinse with deionized water and ethanol for several Secondary to neutral, dry the solid at 100°C for 5 hours to obtain pre-oxidized graphite;

[0050] Re-oxidation: Mix 1 g of pre-oxidized graphite with 30 ml of 18mol L -1 3 grams of potassium permanganate were slowly added under ice-water bath and stirring conditions to ensure that the temperature of the mixture did not exceed 20°C, and then the temperature was raised to about 38°C for 3 hours of reaction. After the reaction, 180 ml of deionized dilution was slowly added (keep The temperature of the solution ...

Embodiment 3

[0058] (1) Preparation of graphene oxide dispersion by modified Hummers method

[0059] Pre-oxidation: uniformly disperse 0.7 g of potassium persulfate and 0.5 g of phosphorus pentoxide into 6 ml of 18 mol L -1 In the concentrated sulfuric acid, add 1 gram of graphite powder, shake evenly, condense and reflux in a water bath at 78 °C for 7 hours, cool to room temperature and dilute into 130 ml of deionized water, vacuum filter, rinse with deionized water ethanol and several times Secondary to neutral, dry the solid at 110°C for 4 hours to obtain pre-oxidized graphite;

[0060] Re-oxidation: Mix 1 g of pre-oxidized graphite with 35 ml of 16mol L -1 Mix the concentrated sulfuric acid with ice-water bath and slowly add 4 grams of potassium permanganate under stirring conditions to ensure that the temperature of the mixture does not exceed 20 ° C, then heat up to 40 ° C for 2.5 hours, after the reaction is completed, slowly add 160 ml of deionized dilution (keep the solution The...

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Abstract

The invention discloses a high-thermal-conductivity graphene-based composite film and a preparation method thereof. Based on the mass percentage of solid raw materials, the graphene-based composite film is prepared from the following raw materials: 40-70% of graphene oxide, 30-60% of stabilizer, 1-3% of surfactant and 1-10% of reinforcing agent; the preparation comprises the following steps: mixing a graphene oxide dispersion, the stabilizer, the surfactant and the reinforcing agent dispersion, performing ultrasonic treatment, and stirring uniformly to obtain a graphene oxide-based composite dispersion; obtaining a graphene oxide based composite film by a solution film forming process; finally, performing secondary hot-pressing reduction to obtain the graphene oxide-based composite film. Thickness of the graphene-based composite film disclosed by the invention is controllable at 10-50 microns, the thermal conductivity on the room-temperature surface is 800-1,600Wm<-1>k<-1>, the tensilestrength can reach 10-30MPa, and the graphene oxide-based composite film is not broken when bent at 180 DEG C.

Description

technical field [0001] The invention relates to a heat-conducting composite material, in particular to a light-weight, flexible and high-thermal-conductivity graphene-based composite material and a preparation method thereof, which are used in the high-power, high-heat-flux-density electronics industry and the field of heat dissipation for electronic devices of intelligent equipment. Background technique [0002] With the miniaturization of electronic devices and the increasing power density of components, the interest in fast and high thermal conductivity advanced materials has grown surprisingly. Although traditional metal materials have good flexibility, they have high density and low thermal conductivity, which can no longer meet people's needs. Therefore, non-metallic materials have become a research hotspot. Although the thermal conductivity of high-quality graphite and diamond films can reach 2000W m -1 k -1 , but harsh production conditions and high production cos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/52C04B35/622C04B35/645C01B32/198
CPCC01B32/198C04B35/522C04B35/62218C04B35/645C04B35/83C04B2235/652C04B2235/6567C04B2235/658C04B2235/96C04B2235/9607
Inventor 李静陈旭阳李阳
Owner SOUTH CHINA UNIV OF TECH
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