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Preparation method of high-modulus and high-heat-conducting asphalt-based carbon fibers

A pitch-based carbon fiber and pitch fiber technology, which is applied in the fields of fiber chemical characteristics, rayon manufacturing, textiles and papermaking, etc., can solve the problem of difficult boron controllable and uniform dispersion addition, difficult control of boron volatilization, and influence on product quality stability, etc. problems, to achieve high production efficiency, easy industrial production, high modulus and thermal conductivity

Active Publication Date: 2018-08-28
湖南东映碳材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gas-phase catalytic method has great limitations, because it is difficult to control the volatilization of boron associated to the furnace tube wall, which affects the quality stability of the product. It can be seen that it is difficult for the methods reported so far to achieve the controllable boron concentration. Add evenly

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] This embodiment is a specific implementation of the present invention, specifically the following steps:

[0023] Step (1) using ethylene tar as a raw material, performing thermal cutting for 6 hours by nitrogen bubbling at atmospheric pressure, removing light components below 300°C, and obtaining ethylene tar pitch with a softening point of 80°C;

[0024] Step (2) Add triethyl borate to the ethylene tar pitch at a temperature of 100°C, program the temperature to 400°C under mechanical stirring and airtight conditions, and pressurize and heat under a pressure of 1MPa by self-boosting Polymerize for 6 hours, then lower the temperature to 360°C for vacuum devolatilization for 1 hour, then blow in nitrogen to normal pressure and cool to obtain boron-containing spinnable mesophase pitch;

[0025] Step (3) performing melt spinning with boron-containing spinnable mesophase pitch as raw material to obtain continuous boron-containing pitch fiber precursors;

[0026] Step (4) p...

Embodiment 2

[0030] This embodiment is a specific implementation of the present invention, specifically the following steps:

[0031] Step (1) using ethylene tar as a raw material, performing thermal cutting for 9 hours by nitrogen bubbling at atmospheric pressure, removing light components below 300°C, and obtaining ethylene tar pitch with a softening point of 90°C;

[0032] Step (2) Add triethyl borate to ethylene tar pitch at a temperature of 100°C, raise the temperature to 410°C under mechanical stirring and airtight conditions, and carry out pressurized thermal polymerization under a pressure of 3MPa by self-boosting React for 12 hours, then lower the temperature to 380°C for vacuum devolatilization for 5 hours, then blow nitrogen into the mixture to cool at normal pressure to obtain boron-containing spinnable mesophase pitch;

[0033] Step (3) melt-spinning the boron-containing spinnable mesophase pitch as a raw material to obtain continuous boron-containing pitch fiber precursors; ...

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Abstract

The invention discloses a preparation method of high-modulus and high-heat-conducting asphalt-based carbon fibers. The preparation method comprises the following steps: firstly, preparing ethylene tarasphalt with the softening point of 80 to 90 DEG C through a common pressure nitrogen bubbling and purging method; then adding triethyl borate into the ethylene tar asphalt; them preparing boron-containing spinnable mesophase asphalt through a pressurization and thermal polymerization, and decompression and devolatilization method; then carrying out melting spinning, pre-oxidization, carbonization and graphitization to prepare a high-modulus and high-heat-conducting asphalt-based carbon fiber sample, wherein the tensile modulus is 800 to 900GPa and the heat conductivity is 800 to 1000W / m.K. According to the preparation method disclosed by the invention, a boron element is introduced into mesophase spinning asphalt through a chemical reaction method and uniform and controllable addition ofthe boron element is realized; the difficulty of a conventional method that the boron element is not uniformly added is solved; the boron element effectively has the effect of catalyzing the graphitization in a subsequent preparation process of the asphalt-based carbon fibers, so that the graphitization treatment temperature is reduced, the service life of a graphite furnace is prolonged and theproduction cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of high-performance pitch-based carbon fiber preparation technology, and specifically relates to a method for uniformly and controllably introducing boron element through chemical reaction to catalyze graphitization to prepare pitch-based carbon fiber with high modulus and high thermal conductivity. Background technique [0002] High modulus and high thermal conductivity pitch-based carbon fiber has the incomparable advantages of high modulus and high thermal conductivity of polyacrylonitrile (PAN)-based carbon fiber. It is known as the "crown jewel" in the field of carbon fiber. While achieving light weight in industrial equipment and electronic products, it is irreplaceable as a structural material to carry loads, and as a functional material for heat protection and heat conduction. It is a high-end carbon fiber variety with great development prospects. [0003] The preparation process of pitch-based carbo...

Claims

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Application Information

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IPC IPC(8): D01F9/155D01F1/10
CPCD01F1/10D01F9/155
Inventor 刘金水叶崇黄东吴晃李保六李益
Owner 湖南东映碳材料科技有限公司
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