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Flexible thermal conductive film using synergistic effect of multi-particle size graphene and preparation method thereof

A technology of thermal conductive film and graphene powder, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of application limitation and low thermal conductivity of thermal conductive film, so as to solve the problem of heat dissipation, improve the thermal conductivity, and improve the thermal conductivity. soft effect

Active Publication Date: 2019-07-26
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the thermal conduction films currently on the market are usually prepared by simple calendering of graphene raw materials or metal materials with a single particle size. The thermal conductivity of the prepared thermal conduction films is usually low, and its application is limited.

Method used

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  • Flexible thermal conductive film using synergistic effect of multi-particle size graphene and preparation method thereof
  • Flexible thermal conductive film using synergistic effect of multi-particle size graphene and preparation method thereof

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Experimental program
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Embodiment 1

[0032] Prepare the thermally conductive film of this embodiment according to the following steps:

[0033] 1. Take large particle size graphene powder (particle size distribution range 35 ~ 37μm), medium particle size graphene powder (particle size distribution range 18 ~ 20μm), small particle size graphene powder (particle size distribution range 1 ~2μm), acid treatment under the following conditions:

[0034] The graphene powder is added to the acid solution mixed with sulfuric acid and nitric acid according to the volume ratio of 3:1, and subjected to ultrasonic treatment. The ultrasonic treatment conditions are: 600W treatment for 6h to obtain a graphene dispersion; each graphene dispersion In, the concentration of graphene powder is 4mg / ml;

[0035] 2. Get 0.03g acid-treated large-diameter graphene (35~37μm) dispersion (0.03g is based on the graphene weight in the dispersion, that is, get 7.5mL graphene powder dispersion here; About getting the graphene dispersion liqui...

Embodiment 2

[0042] Prepare the thermally conductive film of this embodiment according to the following steps:

[0043] 1. Take large particle size graphene powder (particle size distribution range (30~31 μm), medium particle size graphene powder (particle size distribution range (21~23 μm), small particle size graphene powder (particle size distribution range) Range (1~2 μ m), carry out acid treatment respectively, and described acid treatment condition is as follows:

[0044] Large-diameter graphene powder (30-31 μm): immerse the graphene powder in an acid solution mixed with sulfuric acid and nitric acid at a volume ratio of 2:1, and perform ultrasonic treatment. The ultrasonic treatment condition is: 400W treatment 10h, obtain graphene dispersion liquid; In this graphene dispersion liquid, the concentration of graphene acid powder is 3.5mg / ml;

[0045] Medium-sized graphene powder (21-23 μm): immerse the graphene powder in an acid solution mixed with sulfuric acid and nitric acid at a...

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Abstract

The invention provides a flexible heat conducting film using multi-particle size graphene synergism and a preparation method thereof. The heat conducting film is prepared by uniform mixing of graphene powder with different particle sizes. The preparation method includes: dispersing large particle size graphene powder, medium particle size graphene powder and small particle size graphene powder in deionized water, and mixing the substances evenly; and preparing a dispersion solution containing graphene powder with a variety of particle sizes into a graphene film, thus obtaining the heat conducting film. The method provided by the invention employs a variety of graphene powder of different particle sizes for uniform mixing to prepare the heat conducting film, the graphene powder of different particle sizes can reach an obvious synergistic effect, and greatly improves the thermal conductivity of the film. At the same time, the prepared heat conducting film has good flexibility, and can be used for solving the heat dissipation problem of flexible circuits and the like.

Description

technical field [0001] The invention relates to a flexible heat-conducting film and a preparation method thereof, in particular to a flexible heat-conducting film utilizing the synergistic effect of multi-particle diameter graphene and a preparation method thereof. Background technique [0002] With the rapid development of the electronic technology industry, electronic products are becoming more and more portable, and at the same time, the functional requirements are gradually increasing. The continuous improvement of the integration and assembly density of electronic components makes the calorific value of the product increase sharply during operation. The heat dissipation problem caused by the increase of power consumption needs to be solved urgently, and the production and preparation of various thermal interface materials and thermal conductive films have attracted widespread attention. [0003] However, the thermal conduction films currently on the market are usually ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194
CPCC01B2204/24C01B2204/32
Inventor 田晓娟李琦李永峰高金森
Owner CHINA UNIV OF PETROLEUM (BEIJING)