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Carbonization technology for graphite film

A technology of graphite film and process, which is applied in the field of artificially synthesized graphite heat-conducting film, can solve the problems of residual impurities, affecting the purity and quality of graphite film, and low weight loss rate, and achieve the effect of increasing carbonization weight loss, improving purity and quality, and increasing production capacity

Inactive Publication Date: 2019-11-15
WUXI JONES TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Under the existing technology, after 100mg of PI film is treated by the traditional carbonization process, the carbonization weight loss is only about 22mg, that is, the carbonization weight loss rate is only about 22%. figure 1 As shown, the weight loss rate is low, and there are still a small amount of impurities remaining in the graphite, which directly affects the purity and quality of the graphite film.

Method used

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  • Carbonization technology for graphite film
  • Carbonization technology for graphite film

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Experimental program
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Effect test

Embodiment 1

[0029] A kind of graphite film carbonization process comprises the following steps:

[0030] a, get the graphite tube core, process the exhaust hole on the tube wall of the graphite tube core, and set aside;

[0031] b. Cut the PI film according to the set length and width, and the cutting width is less than or equal to the height of the graphite tube core;

[0032] c. A total of 100 mg of the cut PI film is guided to form a PI film roll, so that the outer diameter of the PI film roll is smaller than the inner diameter of the graphite tube core and there is a space in the center of the PI film roll. Put the PI film roll into the graphite In the die;

[0033] d. Put the graphite tube core together with the PI film roll into the carbonization furnace, and place the graphite tube core horizontally on the bottom plate of the heating chamber of the carbonization furnace;

[0034] e. Raise the temperature of the carbonization furnace to 300°C at a constant speed of 15°C / min;

[0...

Embodiment 2

[0039] A kind of graphite film carbonization process comprises the following steps:

[0040] a, get the graphite tube core, process the exhaust hole on the tube wall of the graphite tube core, and set aside;

[0041] b. Cut the PI film according to the set length and width, and the cutting width is less than or equal to the height of the graphite tube core;

[0042] c. The cut PI film is guided to form a PI film roll, so that the outer diameter of the PI film roll is smaller than the inner diameter of the graphite tube core and there is a space in the center of the PI film roll, and the PI film roll is put into the graphite tube core middle;

[0043] d. Put the graphite tube core together with the PI film roll into the carbonization furnace, and place the graphite tube core horizontally on the bottom plate of the heating chamber of the carbonization furnace;

[0044] e. Raise the temperature of the carbonization furnace to 280°C at a constant speed of 14°C / min;

[0045] f. ...

Embodiment 3

[0050] A kind of graphite film carbonization process comprises the following steps:

[0051] a, get the graphite tube core, process the exhaust hole on the tube wall of the graphite tube core, and set aside;

[0052] b. Cut the PI film according to the set length and width, and the cutting width is less than or equal to the height of the graphite tube core;

[0053] c. The cut PI film is guided to form a PI film roll, so that the outer diameter of the PI film roll is smaller than the inner diameter of the graphite tube core and there is a space in the center of the PI film roll, and the PI film roll is put into the graphite tube core middle;

[0054] d. Put the graphite tube core together with the PI film roll into the carbonization furnace, and place the graphite tube core horizontally on the bottom plate of the heating chamber of the carbonization furnace;

[0055] e. Raise the temperature of the carbonization furnace to 320°C at a constant speed of 16°C / min;

[0056] f. ...

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Abstract

The invention relates to a carbonization technology for a graphite film. The carbonization technology comprises the following steps that an air discharging hole is formed in the pipe wall of a graphite pipe core; a PI film is split; the PI film is rolled through guiding to form a PI film roll, and the PI film roll is placed in the graphite pipe core; the pipe core is placed in a carbonization furnace; the temperature of the carbonization furnace is increased to 280-320 DEG C at the speed of 14-16 DEG C / min; the temperature of the carbonization furnace is increased to 580-620 DEG C at the speedof 12-14 DEG C / min, heating is stopped, and natural cooling is conducted to 280-320 DEG C; the heating and cooling steps are repeated 2-4 times; the temperature of the carbonization furnace is increased to 580-620 DEG C at the speed of 12-14 DEG C / min firstly, then the temperature continues being increased to 1,280-1,320 DEG C at the speed of 12-14 DEG C / min, heating is stopped, natural cooling is conducted to the room temperature, and the carbonization process is ended. According to the technology, the weight loss ratio of the PI film during carbonization can be effectively improved, the purity and quality of artificially synthesized graphite can be improved, the technology time can be effectively shortened, the carbonization efficiency is improved, and the productivity is increased.

Description

technical field [0001] The invention relates to the field of artificially synthesized graphite heat-conducting films, and specifically relates to a graphite film carbonization process. Background technique [0002] Synthetic graphite film is a new type of heat-conducting and heat-dissipating material, which is made of PI film after high-temperature carbonization and graphitization by chemical methods. [0003] In the production process of graphite heat-conducting film, the PI film coil is firstly subjected to carbonization reaction treatment in a carbonization furnace, and then transferred to a high-temperature graphitization furnace for graphitization treatment after heating up and cooling down. Among them, carbonization is the process in which PI film removes excess impurities at high temperature, leaving only carbon element. The more weight loss during the carbonization process, the more thoroughly the impurities are removed, and the more conducive to the improvement of ...

Claims

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Application Information

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IPC IPC(8): C01B32/205C04B35/52C04B35/524C04B35/622
CPCC01B32/205C04B35/522C04B35/524C04B35/622C04B2235/48C04B2235/656C04B2235/6562C04B2235/94
Inventor 陈曲徐晨辉金晓军杨朝晖吴晓宁朱光福
Owner WUXI JONES TECH