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

AI Technical Summary

Problems solved by technology

The excellent thermal conductivity and mechanical properties make graphene great potential in the field of t

Method used

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Examples

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Example Embodiment

[0019] Example 1

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

Example Embodiment

[0021] Example 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) to it. The reaction system was placed in a 52°C water bath for 40 minutes and the temperature of the water bath was raised to 80°C, then potassium permanganate was slowly added to it, and mechanical stirring was continued for 6 hours. The stirring speed in the whole process is about 600r / min. After the reaction is over, the pre-configured hydrochloric acid and deionized water are used to clean the graphite oxide under the centrifugal action with the centrifugal speed and time of 400r / min and 10min respectively. The graphite oxide obtained above is ultrasonically dispersed in deionized water to obtain a graphene oxide solution, wherein the ultrasonic power and time are respectively 50W and 5h. Then 5g of carbon fiber was added to it, and mixed for 2 hours under the action of mechanical stirring at 300 ...

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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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