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High thermal conductivity graphene-based polymer thermal conductive film and preparation method thereof

A high thermal conductivity graphite, polymer technology, applied in chemical instruments and methods, semiconductor devices, heat exchange materials, etc., can solve the problems of high cost, workability to be improved, low thermal conductivity, etc. Enhanced toughness, reduced operating costs and environmental pollution, and improved thermal conductivity

Active Publication Date: 2018-04-03
苏州格瑞丰纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The highly oriented graphite film formed by high-temperature pyrolysis has a thermal conductivity of up to 2000W / m K, but the cost is high and the machinability needs to be improved. Currently, it is only used in high-end electronic products; the graphite film formed by rolling expanded graphite The thermal conductivity is between 500-800W / m·K, and its thermal conductivity is lower than that of highly oriented graphite film, but it has been greatly improved compared with traditional aluminum-copper materials. Although its cost is low, it has been widely used in various products, but it is also difficult to meet the higher requirements of the ever-growing electronic products, so there is an urgent need for a new lighter and thinner thermal conductivity film to produce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Graphene microsheets (with an average radial size of about 70 μm, a thickness of 0.34 nm to 100 nm, and meeting the aforementioned high-quality thin-layer graphene requirements) and polyamic acid (weight-average molecular weight: 8-100,000) in a mass ratio of 1 : 100% mixed, spread evenly on a clean substrate, then heat-treated at 80-350°C for 2 hours, and finally placed in a carbonization furnace for carbonization at 1400°C for 24 hours, and then moved the carbonized material to the graphitization furnace Graphitization was carried out at 2800°C for 24h, taken out and rolled to obtain an artificial thermally conductive graphite film with a thickness of 15μm and a thermal conductivity of 1950W / m·K.

Embodiment 2

[0023] Graphene microsheets (same as Example 1) and epoxy resin (weight-average molecular weight: 340-2200) were mixed in a mass ratio of 1:100, spread evenly on a clean substrate, and then carried out 80-350 ℃ heat treatment for 2 hours, and finally placed in a carbonization furnace for carbonization at 1400°C for 24 hours, then moved the carbonized material to a graphitization furnace for graphitization at 2800°C for 24 hours, took it out and rolled it, and obtained an artificial heat-conducting graphite film. It is 20μm, and the thermal conductivity is 500W / m·K.

Embodiment 3

[0025] Graphene microsheets (same as Example 1) are mixed with high-density polyethylene (weight-average molecular weight: 4-300,000) in a mass ratio of 1:100, spread evenly on a clean substrate, and then carry out 80 Heat treatment at -350°C for 2 hours, and finally placed in a carbonization furnace for carbonization at 1400°C for 24 hours, then moved the carbonized material to a graphitization furnace for graphitization at 2800°C for 24 hours, took it out and rolled it, and made an artificial heat-conducting graphite film. Its thickness is 20 μm, and its thermal conductivity is 400 W / m·K.

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Abstract

The invention discloses a graphene-based polymer thermal conductive film with high thermal conductivity, a preparation method and application thereof. The preparation method includes: fully mixing graphene micro-sheets and high molecular polymers in different proportions, then forming a thin film, and then carbonizing and graphitizing to prepare the high thermal conductivity graphene-based polymer thermal conductive film. In the present invention, by using graphene material as reinforcing material and additive material, not only the usage amount of high molecular polymer is reduced, the operation cost and environmental pollution are reduced, but also the generation of defects of high molecular polymer in the carbonization process is reduced and its performance is improved. The degree of graphitization can greatly improve the quality of the thermally conductive carbon film, making it thinner and having higher thermal conductivity.

Description

technical field [0001] The invention relates to a heat conduction film and a preparation method thereof, in particular to a high heat conduction graphene-based polymer heat conduction film and a preparation method thereof, belonging to the technical field of heat conduction and heat dissipation materials. Background technique [0002] With the rapid development of microelectronics integration technology and high-density printed board assembly technology, the assembly density has increased rapidly, the volume of electronic components and logic circuits has been reduced by thousands of times, and electronic instruments and equipment are becoming lighter, thinner, shorter and smaller. direction of development. Under high-frequency operating frequency, the working thermal environment of semiconductors moves rapidly towards high temperature. At this time, the heat generated by electronic components accumulates and increases rapidly. Under the ambient temperature of use, electroni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14H01L23/373
Inventor 刘立伟陈明亮王汝冰郭玉芬李奇李伟伟邱胜强刘朝军
Owner 苏州格瑞丰纳米科技有限公司