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A kind of flexible carbon fiber and preparation method thereof

A carbon fiber and flexible technology, applied in the field of preparing high-performance flexible carbon fiber, can solve the problems of poor flexibility and small average grain size, and achieve the effect of high conductivity, small crystallite size, and improved flexibility

Active Publication Date: 2018-08-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention relates to a kind of flexible carbon fiber and its preparation method, and its purpose is to improve the brittleness of conventional carbon fiber, the shortcoming of poor flexibility, this carbon fiber has the graphite crystallite structure that is produced by highly oriented graphite sheet and its induction, and this graphite crystallite Arrangement and orientation along the surface of the graphite sheet; the carbon fiber has the characteristics of large order, compact structure, small average grain size and few defects, which makes the carbon fiber highly flexible

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A kind of preparation method of flexible carbon fiber, graphene and polyacrylonitrile are dissolved in dimethylformamide respectively, the graphene dispersion liquid that makes concentration is 0.5wt% and concentration is the polyacrylonitrile solution of 10wt%, polyacrylonitrile Contain only the first monomer acrylonitrile, the mass fraction of the first monomer relative to the total monomer is 100%, the graphene dispersion is subjected to ultrasonic dispersion treatment, the treatment time is 0.5 hours, the temperature is 10 ° C, and then polyacrylonitrile is added The solution was mechanically stirred and mixed for 1 hour, the rotating speed was 50 rpm, and the temperature was 10°C. After vacuum defoaming for 0.5 hours, the concentration of polyacrylonitrile obtained was 9 wt%, and the mass fraction of graphene relative to polyacrylonitrile was 0.1 % graphene / polyacrylonitrile composite solution;

[0062] The graphene / polyacrylonitrile composite solution is wet-spun ...

Embodiment 2

[0066] A kind of preparation method of flexible carbon fiber, graphene microchip and polyacrylonitrile are dissolved in dimethyl sulfoxide respectively, and the obtained concentration is the graphene microchip dispersion liquid of 5wt% and the polyacrylonitrile solution that concentration is 40wt%, Polyacrylonitrile contains the first monomer acrylonitrile and the second monomer acrylamide, the mass fraction of the first monomer relative to the total monomer is 80%, the mass fraction of the second monomer relative to the total monomer is 20%, and the graphite The olefin microchip dispersion was subjected to magnetic stirring dispersion treatment, the treatment time was 12 hours, the temperature was 40°C, and then polyacrylonitrile solution was added for mechanical stirring and mixing, the time was 24 hours, the speed was 1500 rpm, the temperature was 50°C, ultrasonic After degassing for 1h, the concentration of polyacrylonitrile obtained is 39wt%, and the mass fraction of graph...

Embodiment 3

[0071] A preparation method of flexible carbon fiber, respectively dissolving graphene oxide and polyacrylonitrile in dimethylacetamide to prepare a graphene oxide dispersion with a concentration of 0.8wt% and a polyacrylonitrile solution with a concentration of 22wt%. Acrylonitrile contains the first monomer acrylonitrile and the second monomer methyl acrylate, the mass fraction of the first monomer relative to the total monomers is 99%, and the mass fraction of the second monomer relative to the total monomers is 1%. The graphene dispersion was subjected to mechanical stirring and dispersion treatment, the treatment time was 1 hour, the temperature was 13°C, and then polyacrylonitrile solution was added for mechanical stirring and mixing, the time was 5h, the speed was 165 rpm, and the temperature was 18°C. After degassing for 3 hours, the concentration of polyacrylonitrile obtained is 20wt%, and the mass fraction of graphene oxide relative to polyacrylonitrile is 5% graphene...

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Abstract

The invention relates to a flexible carbon fiber and a preparation method thereof. The carbon fiber is prepared by carrying out spinning on a graphite flake / polyacrylonitrile complex solution and carrying out super-high drafting, pre-oxidation and carbonization treatment. The carbon fiber has highly oriented graphite flakes and graphite crystal structures generated through induction of the graphite flakes, wherein graphite crystallite is arranged and oriented along the surfaces of the graphite flakes. The carbon fiber has the characteristics of high order degree, compact structure, small average grain size and few defects. The rigidity / softness, resistivity, strength and axial thermal conductivity of the prepared flexible carbon fiber are respectively 10<-4>-10mN .cm, 10<-3>-100omega .cm, 1000-5000MPa and 0.5-50W / m .k. The prepared flexible carbon fiber has the beneficial effects that the flexible carbon fiber is low in production cost and wide in raw material sources; the structural properties of the carbon fiber can be substantially improved; and the flexible carbon fiber has very high market application values and can be widely applied to the fields of electrode materials, functional materials, energy materials, and the like.

Description

technical field [0001] The invention belongs to the technical field of composite fiber preparation, and relates to a flexible carbon fiber and a preparation method thereof, in particular to a method for preparing high-performance flexible carbon fiber using conventional polyacrylonitrile as a raw material. Background technique [0002] As one of the three major synthetic fibers, polyacrylonitrile fiber is widely used in clothing, decoration and industrial fields. Polyacrylonitrile precursor is an important precursor for the preparation of carbon fibers, accounting for more than 90% of carbon fiber production. Polyacrylonitrile-based carbon fiber has high mechanical strength, low specific gravity, high temperature resistance, chemical resistance and excellent electrical, physical and mechanical properties. And sports and other fields have a wide range of application prospects. However, carbon fiber has the disadvantages of brittleness and poor flexibility, which makes its c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22D01F1/10
CPCD01F1/10D01F9/22
Inventor 李凤美王彪郑迎迎王华平
Owner DONGHUA UNIV
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