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Preparation method of novel graphene composite heat conduction film

A graphene composite and heat-conducting film technology, applied in the field of film materials, can solve problems such as difficult to use directly, and achieve the effect of increasing toughness

Active Publication Date: 2015-02-18
中科悦达(上海)材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The excellent thermal conductivity and mechanical properties make graphene great potential in the field of thermal management, but these properties are based on the micro-nano scale, which is difficult to use directly

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] Put 5g of flake graphite into a three-necked flask, and then slowly add a mixed solution of 300g of concentrated sulfuric acid and phosphoric acid (9:1) into it. Put this reaction system in a water bath at 42°C for 30 minutes, then raise the temperature of the water bath to 60°C, slowly add 15g of potassium permanganate to it, and continue mechanical stirring for 4 hours, the stirring speed of the whole process is 300r / min. After the reaction, wash with pre-configured hydrochloric acid and deionized water at a centrifugal speed and time of 600r / min and 5min, respectively, to obtain graphite oxide. The graphite oxide was ultrasonicated for 3 hours under 100W ultrasonic conditions to obtain a graphene oxide dispersion. Then add 2.5 g of carbon fibers therein, and mix for 1 h under the action of mechanical stirring at 200 r / min to obtain a mixed solution of graphene oxide and carbon fibers. Then the mixed solution was coated on the PET film previously coated with a rele...

Embodiment 2

[0022] Pour 5g of flake graphite into a three-necked flask, and then slowly add a mixed solution of 400g of concentrated sulfuric acid and phosphoric acid (9:1) into it. The reaction system was placed in a water bath at 52° C. for 40 minutes, and then the temperature of the water bath was raised to 80° C., and potassium permanganate was slowly added thereto, and mechanical stirring was continued for 6 hours. The stirring speed in the whole process is about 600r / min. After the reaction, the graphite oxide was obtained by washing with pre-configured hydrochloric acid and deionized water at a centrifugation speed and time of 400 r / min and 10 min, respectively. Ultrasonic disperse the graphite oxide obtained above in deionized water to obtain a graphene oxide solution, wherein the ultrasonic power and time are 50W and 5h, respectively. Then add 5 g of carbon fibers therein, and mix for 2 h under the action of mechanical stirring at 300 r / min to obtain a mixed solution of graphene...

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Abstract

The invention relates to a film material, and in particular relates to a preparation method of a novel graphene composite heat conduction film. The preparation method comprises the steps of preparing an oxidized graphene solution by an improved hummers method, and then adding carbon fibers to perform mixed coating to prepare a film, wherein the film is subjected to chemical reduction to obtain the graphene composite heat conduction film. The composite heat conduction film prepared by the method disclosed by the invention can be implemented under normal temperature and normal pressure; furthermore, defects of fragility and hardness of the graphene film are also improved. The heat conduction coefficient of the heat conduction film is 500-2,000w / (m.k), and the tensile strength is 2-100MPa.

Description

technical field [0001] The invention relates to a film material, in particular to a preparation method of a novel graphene composite heat conduction film. Background technique [0002] With the rapid development of electronic technology, the integration level and power density of electronic components continue to increase, and the power dissipation density and calorific value of electronic devices are increasing. Therefore, the problem of heat dissipation becomes more and more important, and the requirements for thermal management technology are also more stringent. [0003] Graphene is a two-dimensional sp 2 Bonded single-layer carbon atom crystals, unlike three-dimensional materials, have a low-dimensional structure that can significantly reduce boundary scattering of phonons at grain boundaries and endow them with special phonon diffusion modes. Studies have shown that the thermal conductivity (K) of graphene at room temperature has surpassed that of bulk graphite (2000...

Claims

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Application Information

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IPC IPC(8): B32B37/15
CPCB32B37/15
Inventor 王冬蔡铜祥郭建仁
Owner 中科悦达(上海)材料科技有限公司
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