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Lignin/cellulose-acetate-based epoxy modified carbon fiber and preparation method and application thereof

A technology of cellulose acetate and lignin, which is applied in the chemical characteristics of fibers, textiles and papermaking, hybrid capacitor electrodes, etc., can solve problems such as reducing the performance of use, and achieve the effect of reducing hydrogen bonding, low price and good application prospects.

Active Publication Date: 2019-06-07
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the large number of hydroxyl groups in the chemical structure of cellulose, it will appear phase separation during the physical mixing and spinning process of lignin containing aromatic hydrocarbon structure, which greatly reduces its performance.

Method used

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  • Lignin/cellulose-acetate-based epoxy modified carbon fiber and preparation method and application thereof
  • Lignin/cellulose-acetate-based epoxy modified carbon fiber and preparation method and application thereof
  • Lignin/cellulose-acetate-based epoxy modified carbon fiber and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare lignin / cellulose acetate-based epoxy-modified carbon fibers as follows:

[0033] (1) Dissolve poplar wood prehydrolyzate lignin / and cellulose acetate in acetone / N,N-dimethylformamide (v / v:2:1) according to the mass ratio of 50 / :50 (w / w) ) in the mixed solvent, after completely dissolving, add a certain amount of epichlorohydrin (ECH), and the final concentration of epichlorohydrin in the reaction system is respectively 0wt%, 2wt%, 4wt%, 6wt%, 8wt% and 10wt%, The final concentration of lignin and cellulose acetate in poplar prehydrolyzate is 20%, react at 0°C for 6h, filter to remove unreacted ECH after the reaction, and let stand for 1h to obtain lignin and cellulose acetate copolymer spinning silk liquid;

[0034] (2) Prepare the lignin / cellulose acetate-based carbon fiber precursor by electrospinning the spinning solution obtained in step (1). The conditions for electrospinning are: the electrostatic voltage is 25KV, the receiving distance is 20cm, and the re...

Embodiment 2

[0040] Prepare lignin / cellulose acetate-based epoxy-modified carbon fibers as follows:

[0041] (1) Dissolve poplar wood prehydrolyzate lignin / and cellulose acetate in acetone / N,N-dimethylformamide (v / v:2:1) according to the mass ratio of 40 / :60 (w / w) ) in the mixed solvent, after dissolving completely, add epichlorohydrin, the final concentration of epichlorohydrin in the reaction system is 10wt%, the final concentration of poplar wood prehydrolyzate lignin and cellulose acetate is 15%, at 0 ℃ The reaction was carried out for 6 hours, after the reaction was completed, the unreacted ECH was removed by filtration, and allowed to stand for 2 hours to obtain the spinning solution of lignin and cellulose acetate copolymer;

[0042] (2) Prepare the lignin / cellulose acetate-based carbon fiber precursor by electrospinning the spinning solution prepared in step (1). The conditions of electrospinning are: the static voltage is 25KV, the receiving distance is 25cm, and the receiving rol...

Embodiment 3

[0045] Prepare lignin / cellulose acetate-based epoxy-modified carbon fibers as follows:

[0046] (1) Dissolve poplar wood prehydrolyzate lignin / and cellulose acetate in acetone / N,N-dimethylformamide (v / v:2:1) according to the mass ratio of 60 / :40 (w / w) ) in the mixed solvent, after dissolving completely, add epichlorohydrin, the final concentration of epichlorohydrin in the reaction system is 12wt%, the final concentration of poplar wood prehydrolyzate lignin and cellulose acetate is 25%, at 0 ℃ The reaction was carried out for 6 hours, and after the reaction was completed, the unreacted ECH was removed by filtration and left to stand for 2 hours to obtain a spinning solution of lignin and cellulose acetate copolymer;

[0047] (2) Prepare the lignin / cellulose acetate-based carbon fiber precursor by electrospinning the spinning solution obtained in step (1). The conditions for electrospinning are: the electrostatic voltage is 20KV, the receiving distance is 30cm, and the receivi...

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Abstract

The invention discloses a lignin / cellulose-acetate-based epoxy modified carbon fiber and a preparation method and application thereof. The method includes the steps of carrying out a chemical modification reaction on lignin and cellulose acetate in the presence of epoxy chloropropane to obtain a lignin / cellulose-acetate-based spinning solution, preparing a carbon fiber precursor through an electrostatic spinning method, and preparing a carbon fiber through pre-oxidation treatment and carbonization treatment; adding a proper amount of epoxy chloropropane to enable the epoxy chloropropane to react with hydroxyl groups on lignin and cellulose acetate without an epoxy ring opening phenomenon, so that silk is more likely to be generated in the spinning process. In a pre-oxidation process, an epoxy ring opening phenomenon leads to generation of chemical bonds between the lignin and the cellulose acetate, so that the thermal stability of the lignin and the cellulose acetate is improved, and the occurrence possibility of a phase separation phenomenon is reduced. The carbon fiber prepared through the method has a good fiber shape and high mechanical property and adsorption property and achieves a good application prospect in the aspects of serving as an electrode, a reinforcing material and an adsorbent, and a guarantee is provided for producing the high-quality, environment-friendly and low-cost full-biomass-based carbon fiber.

Description

technical field [0001] The invention belongs to the technical field of biomass material processing, and specifically relates to a lignin / cellulose acetate-based epoxy-modified carbon fiber and a preparation method and application thereof. Background technique [0002] In recent years, global warming, energy crisis and environmental pollution have attracted widespread attention. Adopting alternative energy sources is an effective way to solve these problems, such as various electrochemical energy storage and conversion devices. Low energy density and high cost are the bottlenecks restricting the development of electrochemical capacitors. To solve this problem, the development of new electrode materials for electrochemical capacitors is an important and effective way. Carbon fiber has attracted more and more attention as an electrode material for electrochemical capacitors due to its high mass specific capacity, good electrical conductivity, open pores on the surface, good r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/17D01F9/16C08H7/00C08B13/00H01G11/40H01G11/44
Inventor 李尧周景辉曹其平王兴刘欢
Owner DALIAN POLYTECHNIC UNIVERSITY