Preparation method of high-stretch lignin-based carbon fiber

Abstract

The invention discloses a preparation method of a high-stretch lignin-based carbon fiber. By enzymatic degradation and fermentation treatment of by-products obtained during cellulose production, the impurity content of raw materials is reduced, a benzene ring structure is not degraded, but a benzene ring side chain is modified and more easily dissolved in a solvent, the content of phenolic hydroxyl groups in lignin is increased, and therefore cross-linking of ferulic acid and the phenol structure of the lignin is promoted; under the further curing function of polyethylene, the spinnability ofa spinning solution is improved, the strength of a carbon fiber precursor is improved under the function of physical force between chopped fibers and viscose fibers and the lignin, and therefore the carbon fiber has more excellent strength and stretchability; in addition, the waste reuse of the lignin is achieved, the utilization rate of the lignin is high, the pre-oxidation time of the preparation process is short, the process is simple, the cost is reduced accordingly, and the mass production can be achieved.

Description

technical field [0001] The invention relates to the field of carbon fiber preparation, in particular to a preparation method of high-stretch lignin-based carbon fiber. Background technique [0002] At present, the main raw materials for the production of carbon fiber are polyacrylonitrile, pitch and viscose fiber. Among them, viscose fiber is complex in graphitization and carbonization yield is low, so it is rarely used to produce carbon fiber. It is difficult to completely remove impurities in pitch raw materials, and the conversion cost High and used in a few products, polyacrylonitrile raw materials are more expensive and limit its application. Therefore, research on lignin bio-renewable raw materials with high carbon content to prepare carbon materials, but in order to prepare carbon fibers with high tensile strength, it is necessary to Lignin undergoes more modification pre-treatment, and the impurity content of lignin will also affect the strength of the prepared carbo...

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Problems solved by technology

[0002] At present, the main raw materials for the production of carbon fiber are polyacrylonitrile, pitch and viscose fiber. Among them, viscose fiber is complex in graphitization and carbonization yield is low, so it is rarely used to produce carbon fiber. It is difficult to completely remove impurities in pitch raw materials, and the conversion cost High and used in a few products, polyacrylonitrile raw materials are more expensive and limit its application. Therefore, research on lignin bio-renewable raw materials with high carbon content to prepare carbon materials, but in order to prepare carbon fibers with high tensile strength, it is necessary to Lignin undergoes more modification pre-treatment, and the impurity content of lignin will also affect the strength of the prepared carbon fiber. In addition, the pre-oxidation time in the traditional preparation method is too long, resulting in high preparation cost. Therefore, the improved preparation process is beneficial to carbon fiber. production is of great significance

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