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Composite graphite heat-conducting membrane material with controllable heat conductivity and preparation process thereof

A technology of composite graphite and thermal conductive film, which is applied in the field of thermal conduction and heat dissipation materials and graphite thermal conduction film, can solve the problems of high thermal conductivity, high cost, low cost and low performance of thermally conductive graphite film, unfavorable large-scale and multi-level use of thermally conductive graphite film products. , to achieve the effect of improving machining performance and reducing costs

Inactive Publication Date: 2013-12-18
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

For example, in the patent [CN101193837A], the surface of the graphite film is coated with a metal layer lower than 100nm to strengthen the surface of the graphite film to prevent the particles from falling off; The mechanical tensile properties of graphite films, these patents are limited to the modification and improvement of certain types of graphite films, and cannot fundamentally change or solve the product situation of high thermal conductivity, high cost, low cost and low performance in the heat-conducting graphite film industry
[0007] The polarization between the performance and cost of the two types of graphite film limits its application scope, which is not conducive to the large-scale and multi-level use of thermal conductive graphite film products in many industries

Method used

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  • Composite graphite heat-conducting membrane material with controllable heat conductivity and preparation process thereof
  • Composite graphite heat-conducting membrane material with controllable heat conductivity and preparation process thereof

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specific Embodiment 1

[0020] Specific embodiment 1: Pyromellitic anhydride and 4'4-diaminodiphenyl ether are mixed at a molar ratio of 1:1, polycondensed to form polyamic acid under low temperature and nitrogen conditions, and polyamic acid is used as an adhesive with The worm-like expanded graphite is mixed in a mass ratio of 2:8, dispersed uniformly and part of the solvent is removed, and then formed by hot pressing. The thickness of the composite film is 30 microns after 3 to 5 rolling processes. Pyrolytic graphitization of the composite film under high-purity argon and a pressure of 20MPa is carried out with the following heat treatment process: heating up to 550°C at a rate of 1°C / min and holding for 2 hours; heating up to 900°C at 2°C / min and holding a constant temperature for 2 hours; The temperature is increased to 2400°C at a rate of 2°C / min, and the temperature is kept constant for 2 hours; the furnace is naturally cooled to room temperature. After the prepared composite graphite thermal c...

specific Embodiment 2

[0021] Specific embodiment 2: A dispersion of 50% polyacrylonitrile by mass is mixed with expanded graphite powder, and the mass ratio of polyacrylonitrile to expanded graphite is 3:7. After the film formation and heat treatment process are completed using the same process as in specific example 1, the composite graphite thermal conductive film thickness is about 20±2 μm, the longitudinal thermal conductivity of the graphite film is 27 W / m·K, and the lateral thermal conductivity is 770 W / m·K.

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Abstract

The invention provides a composite graphite heat-conducting membrane material with controllable heat conductivity and a preparation process thereof, and belongs to the technical field of heat-conducting and heat-dissipating materials. The composite graphite heat-conducting membrane with the controllable heat conductivity between 400 W / m.K and 1200 W / m.K is developed by regulating the proportion of a highly oriented graphite and expanded graphite which are contained in a heat-conducting membrane. The composite graphite heat-conducting membrane provided by the invention has the advantages of controllable heat conduction property, low cost and good mechanical property and reprocessing property and can meet the requirement for heat conduction under the condition of multiple working conditions because the thickness of the membrane is between 5 micrometers and 50 micrometers.

Description

Technical field [0001] The invention belongs to the technical field of thermally conductive and heat-dissipating materials, and particularly relates to the field of graphite thermally conductive films. Background technique [0002] In the electronics industry, nuclear industry, new energy, communications, chemical industry and many other fields, if the heat generated during the operation of the equipment cannot be lost in time, it will affect the stability, life and safety of the equipment. [0003] At present, the traditional heat dissipation method is to install copper or aluminum plates on the parts to be dissipated, and then use blades or fans for heat dissipation. With the development of industrial equipment to miniaturization and integration, the heat dissipation system is required to be efficient, small, lightweight and stable. Traditional metal thermal materials represented by aluminum and copper have been unable to meet the heat dissipation requirements of modern industri...

Claims

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Application Information

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IPC IPC(8): C09K5/14
Inventor 崔光磊张波韩鹏献逄淑平刘志宏黄长水姚建华徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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