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Preparation method of high-heat conductivity flexible graphite film

A flexible graphite, high thermal conductivity technology, applied in the field of preparation of high thermal conductivity flexible graphite film, can solve the problems of inability to guarantee the consistency of the thickness and strength index of flexible graphite film, and the inability to separate harmful gases from raw materials

Active Publication Date: 2015-05-13
浙江国泰萧星密封材料股份有限公司
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Problems solved by technology

[0003] The present invention provides a method for preparing a flexible graphite film with high thermal conductivity, which mainly solves the problems existing in the prior art that the harmful gas in the graphite cannot be effectively separated from the raw materials, and the thickness, density and strength of the flexible graphite film cannot be guaranteed. Technical issues such as consistency of indicators

Method used

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  • Preparation method of high-heat conductivity flexible graphite film
  • Preparation method of high-heat conductivity flexible graphite film
  • Preparation method of high-heat conductivity flexible graphite film

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Embodiment

[0023] Embodiment: the preparation method of a kind of high thermal conductivity flexible graphite film of this example is characterized in that described method comprises:

[0024] a. Use high-quality natural high-purity large-grain flake graphite with complete lattice structure and carbon content > 99%. The particle size of flake graphite is ≥ 250um. Start the feeding fan to send the expandable flake graphite raw material in the hopper into the high-temperature furnace for expansion , the expansion temperature is 800℃~1200℃, and the worm graphite is obtained by treatment;

[0025] b. Carry out steam desulfurization during the expansion process of worm graphite;

[0026] c. Graphite after steaming and desulfurization is fed by double cyclones at the blanking port of the extruder. figure 1 , figure 2 , the blanking port of the puffing furnace includes two cylinders 1 with a large top and a small bottom. The upper parts of the two cylinders are connected with a blanking pipe...

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Abstract

The invention relates to a preparation method of a graphite film, in particular to a preparation method of a high-heat conductivity flexible graphite film, and mainly solves the technical problems that in the prior art, harmful gas and raw materials in graphite cannot be efficiently separated, and the consistency of the thickness index, the density index and the strength index of the flexible graphite film cannot be guaranteed. The preparation method comprises the following steps: performing high-temperature bulking on high-quality natural high-purity large-particle flake graphite with a complete lattice structure and the carbon content greater than 99%, performing steam discharge desulfurization on vermicular graphite, and performing dual-cyclone discharging on the vermicular graphite after the steam discharge desulfurization at a discharging port of a bulking furnace, so that the vermicular graphite is flatly piled and densely distributed on a press roll table; calendaring the vermicular graphite through the press roll table, and rolling to obtain the final high-heat conductivity flexible graphite film.

Description

technical field [0001] The invention relates to a preparation method of a graphite film, in particular to a preparation method of a highly thermally conductive flexible graphite film. Background technique [0002] At present, ordinary thermal conductive film materials can no longer meet the high parameter requirements of modern electronics, communications, aviation and national defense and military industries. At present, the high thermal conductivity flexible graphite film developed abroad has the electrical and thermal conductivity of metal materials, and has the same properties as organic plastics. Plasticity, and also has special thermal properties, chemical stability, lubrication and good process properties such as being able to be coated on solid surfaces, etc., and has been widely used in modern electronics, communications, aviation and national defense industries. Chinese patent discloses a production method of graphite film (publication number: CN104015468A), which ...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 孙锦龙孙李超王仕江
Owner 浙江国泰萧星密封材料股份有限公司
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