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Method for preparing carbon fiber by co-spinning biomass extract and polyacrylonitrile and carbon fiber

A polyacrylonitrile and extractive technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of poor spinnability and high cost, and achieve the effects of developed surface pore structure, high quality carbon fiber, and reduced production costs.

Active Publication Date: 2020-10-30
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0012] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a method for preparing carbon fibers by co-spinning biomass hot-soluble extracts and polyacrylonitrile. Spinning, using biomass thermal extraction to simplify the existing biomass-based carbon fiber preparation process steps, and partially replace the high-cost polyacrylonitrile, thereby reducing production costs, and at the same time solve the problem of poor spinnability when the extracted product is used for spinning alone this question

Method used

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  • Method for preparing carbon fiber by co-spinning biomass extract and polyacrylonitrile and carbon fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0040]Using sawdust (pine wood) as raw material, put it and 300ml 1-methylnaphthalene in a reaction kettle to carry out hot-solution extraction experiment at 350°C, the reaction residence time is 60min, Deposit (precipitate) in the obtained high molecular weight extract The carbon content is increased to 75.04%, the aroma is 58.70%, the ash content is 0.40%, and the softening point is 230°C. After the obtained high molecular weight extract and polyacrylonitrile were mixed in equal proportions for electrospinning, the temperature was raised from room temperature to 280°C at a heating rate of 1.0°C / min in the air atmosphere and kept for two hours for pre-oxidation, and then switched The nitrogen atmosphere was heated up to 800°C at a rate of 8°C / min and held for two hours for carbonization treatment to obtain carbon fibers. The surface pore structure of the obtained carbon fibers was developed, mainly micropores aggregated, and the specific surface area reached 714.20m 2 / g, the...

Embodiment 2

[0042] Using sawdust (pine wood) as raw material, put it and 300ml 1-methylnaphthalene in a reaction kettle for hot-solution extraction experiment at 350°C, the reaction residence time is 60min, the carbon content of Deposit in the obtained high molecular weight extract Increased to 75.04%, the aroma is 58.70%, the ash content is 0.40%, and the softening point is 230°C. After the obtained high molecular weight extract and polyacrylonitrile were mixed in equal proportions for electrospinning, the temperature was raised from room temperature to 280°C at a rate of 0.5°C / min in the air atmosphere and kept for two hours for pre-oxidation, and then switched The nitrogen atmosphere is heated up to 1000°C at a rate of 10°C / min and held for two hours for carbonization treatment to obtain carbon fibers. The surface pore structure of the obtained carbon fibers is developed, mainly micropores are aggregated, and the specific surface area reaches 836.82m 2 / g, the specific volume reaches 1...

Embodiment 3

[0044] Using sawdust (pine wood) as raw material, put it and 300ml 1-methylnaphthalene in a reaction kettle to carry out hot-solution extraction experiment at 350°C, the reaction residence time is 30min, and the carbon content in the obtained high molecular weight extract increases To 73.53%, the aroma is 56.90%, the ash content is 0.16%, and the softening point is 210°C. After the obtained high molecular weight extract and polyacrylonitrile were mixed in equal proportions for electrospinning, the temperature was raised from room temperature to 280°C at a heating rate of 2°C / min in an air atmosphere and kept for two hours for pre-oxidation, and then switched In the nitrogen atmosphere, the temperature was raised to 800°C at a rate of 8°C / min and held for two hours for carbonization treatment to obtain carbon fibers. The surface pore structure of the obtained carbon fibers was developed, mainly micropores aggregated, and the specific surface area reached 656.42m 2 / g, the speci...

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Abstract

The invention discloses a method used for preparing a carbon fiber via cospinning of a biomass extracted product and polyacrylonitrile, and the carbon fiber. According to the method, an organic solvent is adopted for extraction of a biomass raw material so as to obtain a low molecular extracted product which is soluble at normal temperature; a spinning solution is prepared from a high molecular weight extracted product, polyacrylonitrile, and a spinning solvent, water bath heating and stirring are carried out, and static spinning is carried out; obtained filament is subjected to oxidation andhigh temperature carbonization so as to obtain the carbon fiber. The preparation path of the carbon fiber is provided; the raw material cost is lower than that of conventional carbon fiber preparationtechnology, and the raw material can be used for replacing a part of polyacrylonitrile precursor which is relatively high in cost; the preparation method is relatively simple; environment pollution is relatively low; the quality of the obtained carbon fiber is excellent; a well developed pore structure is achieved; the largest specific surface area is 836.82m<2> / g; the largest specific volume is188.41cm<3> / g; and excellent economical benefit and promising application prospect are achieved.

Description

technical field [0001] The invention belongs to the fields of utilization of biomass renewable energy and preparation of high-performance materials, and more specifically relates to a method for preparing carbon fibers by co-spinning biomass hot-soluble extracts and polyacrylonitrile and the carbon fibers. Background technique [0002] Carbon fiber is an inorganic carbon fiber material with a carbon content of more than 90%. Due to the difference of different spinning methods in the preparation process, carbon fibers have different characteristics. The current spinning methods mainly include melt spinning and electrospinning. [0003] The carbon fiber finally obtained by melt spinning is thicker and has the characteristics of low density, high strength, high modulus, high thermal conductivity, high temperature resistance, chemical corrosion resistance, low thermal expansion coefficient, low electrical resistance, and chemical radiation resistance. It can be used as Reinfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22D01F9/16
CPCD01F9/16D01F9/22
Inventor 李显吴超朱贤青钱玮翔胡振中姚洪汪峰张旭聂帅熊钊
Owner HUAZHONG UNIV OF SCI & TECH
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