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A method for preparing high-strength coal-based isotropic pitch-based carbon fibers

A pitch-based carbon fiber, isotropic technology, applied in fiber chemical characteristics, textiles and papermaking, etc., can solve the problem of low strength of pitch-based carbon fiber, and achieve the effect of large market prospects and economic benefits

Active Publication Date: 2021-06-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in the above related patents, the general-purpose pitch-based carbon fiber produced by the pitch raw material and the improved process method highlights the problem of low strength

Method used

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  • A method for preparing high-strength coal-based isotropic pitch-based carbon fibers
  • A method for preparing high-strength coal-based isotropic pitch-based carbon fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Taking bituminous coal as an example, the method for preparing high-strength coal-based isotropic pitch-based carbon fibers consists of the following steps:

[0023] Preparation of ash-free coal: Mix 100g of bituminous coal with 600g of 1-methylnaphthalene, and react for 3 hours in a high-temperature and high-pressure coal extraction reaction device (designed by ourselves) at 360°C and 2MPa. After the reaction is over, stop stirring, carry out solid-liquid separation and let it stand for 10 minutes, then perform hot-press filtration on three filter plates (5um, 2um, 0.5um), and finally carry out vacuum rotary evaporation at 200°C for the collected filtrate to recover the solvent . Ashless coal A of bituminous coal origin was thus obtained, having an ash content of 147 ppm.

[0024] Preparation of spinning pitch: Ash-free coal A was used as raw material, heat treated at 280°C for 1 hour under vacuum degree of 10Pa to remove its volatile components, and spinning pitch AP...

Embodiment 2

[0030] Taking sub-bituminous coal as an example, the method for preparing high-strength coal-based isotropic pitch-based carbon fibers consists of the following steps:

[0031] Preparation of ash-free coal: 100g of sub-bituminous coal and 800g of 2-methylnaphthalene were mixed, and the reaction was carried out in a high-temperature and high-pressure coal extraction reaction device (designed by ourselves) at 380°C and 3MPa for 3h. After the reaction is over, stop stirring, carry out solid-liquid separation and let it stand for 10 minutes, then perform hot-press filtration on three filter plates (5um, 2um, 0.5um), and finally carry out vacuum rotary evaporation at 200°C for the collected filtrate to recover the solvent . Ashless coal B of sub-bituminous origin was thus obtained with an ash content of 205 ppm.

[0032] Preparation of spinning pitch: Ash-free coal B was used as raw material, heat treated at 300°C for 1.5h under vacuum degree of 10Pa to remove its volatile compone...

Embodiment 3

[0038] Taking lignite as an example, the method for preparing high-strength coal-based isotropic pitch-based carbon fibers consists of the following steps:

[0039] Preparation of ash-free coal: Mix 100g of lignite and 1000g of 2-methylanthracene, and react for 3h at 410°C and 3MPa in a high-temperature and high-pressure coal extraction reaction device (designed by ourselves). After the reaction is over, stop stirring, carry out solid-liquid separation and let it stand for 10 minutes, then perform hot-press filtration on three filter plates (5um, 2um, 0.5um), and finally carry out vacuum rotary evaporation at 200°C for the collected filtrate to recover the solvent . A lignite-derived ash-free coal C having an ash content of 275 ppm was thus obtained.

[0040] Preparation of spinning pitch: Ash-free coal C was used as raw material, heat treated at 280°C for 3 hours under a vacuum of 10Pa to remove its volatile components, and spinning pitch CP with a softening point of 210°C w...

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Abstract

The invention discloses a production method of high-strength isotropic pitch-based carbon fiber: ash-free coal is used as the pitch precursor, the volatile components are removed by thin-layer evaporation, and the softening point of the pitch is controlled at 180-260°C. Spinning pitch is obtained, and then carbon fibers are prepared by melt spinning, pre-oxidation, and carbonization processes; coal and 1-methylnaphthalene are mixed in a mass ratio of 1:2 to 1:10, and the temperature is 350 to 410 ° C, the pressure is Perform solvent extraction reaction at 1-5 MPa for 1-5 hours, and then obtain ash-free coal after solid-liquid separation, hot-press filtration and solvent recovery. Finally, the carbon fiber is prepared by melt spinning, pre-oxidation, carbonization and other processes. The present invention uses coal as a raw material to produce general-purpose pitch-based carbon fibers with excellent performance indicators, the tensile strength of which is as high as 1500 MPa, and has great market prospects and economic benefits.

Description

technical field [0001] The invention relates to the field of carbon fiber production, in particular to a preparation method of general-grade isotropic pitch-based carbon fiber. Background technique [0002] Carbon fiber has a series of excellent properties such as low density, high strength, high modulus, high temperature resistance, low thermal expansion coefficient, chemical corrosion resistance, high thermal conductivity and electrical conductivity, and is an indispensable new material for military and civilian use. It has an indispensable demand for engineering materials in national defense and aerospace, and has great application prospects in transportation, machinery, sports and leisure, medical and health care, and civil engineering. However, the high production cost of carbon fiber greatly limits the wide application of carbon fiber. Therefore, the development of low-cost and high-performance carbon fiber preparation technology has become one of the key issues that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/15
CPCD01F9/15
Inventor 杨建校张夏翔吴伟石奎
Owner HUNAN UNIV
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