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Preparation method of high-strength coal series isotropic asphalt base carbon fiber

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

Active Publication Date: 2018-09-21
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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  • Preparation method of high-strength coal series isotropic asphalt base carbon fiber
  • Preparation method of high-strength coal series isotropic asphalt base carbon fiber

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 a high-strength coal series isotropic asphalt base carbon fiber. The production method comprises the following steps: taking ashless coal as an asphalt precursor, removing volatile components of the ashless coal by adopting a thin layer evaporation method, and controlling a softening point of asphalt at a temperature of 180 to 260 DEG C to obtain spinning alphalt; then obtaining a carbon fiber by a melt spinning technology, a preoxidizing technology, a carbonization technology and the like; mixing coal with 1-methylnaphthalene according to the ratio of 1-2 to 1-10, carrying out solvent extraction reaction at the temperature of 350 to 410 DEG C and the pressure of 1 to 5MPa, and then carrying out solid-liquid separation, hot press filtering andsolvent recovery to obtain the ashless coal; finally, preparing the carbon fiber of the ashless coal by the melt spinning technology, the preoxidizing technology, the carbonization technology and thelike. According to the production method disclosed by the invention, coal is used as a raw material for producing a general asphalt base carbon fiber with excellent performance indexes; tensile strength of the general asphalt base carbon fiber is as high as 1500MPa; the general asphalt base carbon fiber has a broader market prospect 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 Applications(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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