Preparation method of high-stretch lignin-based carbon fiber

A plain-based carbon fiber and lignin-based technology is applied in the field of preparation of high-stretch lignin-based carbon fiber, which can solve the problems of high preparation cost, long pre-oxidation time, low carbonization yield, etc. The effect of less oxidation time and low cost of incoming materials

Inactive Publication Date: 2019-06-07
佛山市石金科技有限公司
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  • Abstract
  • Description
  • Claims
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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

Method used

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  • Preparation method of high-stretch lignin-based carbon fiber

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Experimental program
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Effect test

Embodiment 1

[0038] A method for preparing high-stretch lignin-based carbon fibers comprises the following steps;

[0039] (1) Recovery of by-products in the cellulose production and purification process;

[0040] (2) Add 2% of the lignin mass percentage to the by-products in a ratio of 1:0.1:0.1 phenol oxidase, yeast and bacillus to carry out fermentation treatment for 1d, and centrifuge the fermentation broth at a speed of 5000r / min. For 5min, after filtering, take the solid part as fermented lignin;

[0041] (3) Add acetic anhydride accounting for 0.3% of the lignin mass percentage and a concentration of 0.5g / mL in the fermented lignin, add a mixture of dioxane and methanol according to the liquid-solid ratio of 3:1, centrifuge, and filter to obtain After purifying the lignin, add 1% potassium chlorate for oxidation treatment at a temperature of 158°C;

[0042] (4) Add 0.1% ferulic acid to the oxidized lignin, blend 0.1% polyethylene, chopped fiber and binder fiber at a ratio of 1:1:1...

Embodiment 2

[0047] A method for preparing high-stretch lignin-based carbon fibers comprises the following steps;

[0048] (1) Recovery of by-products in the cellulose production and purification process;

[0049](2) Add 10% of the lignin mass percentage to the by-products in a ratio of 3:0.2:0.5 glucose oxidase, yeast and bacillus to carry out fermentation treatment for 3 days, and centrifuge the fermentation broth at a speed of 8000r / min. For 15min, after filtering, take the solid part as fermented lignin;

[0050] (3) Add 0.5% of the lignin mass percentage to the fermented lignin, and the concentration is 0.5g / mL of acetic anhydride, add a mixture of dioxane and methanol according to the liquid-solid ratio of 5:1, centrifuge, and filter to obtain After purifying the lignin, add 4% sodium chlorate for oxidation treatment at a temperature of 250°C;

[0051] (4) Add 0.5% ferulic acid to the oxidized lignin, blend 0.3% polyethylene, chopped fiber and binder fiber at a ratio of 3:2:3, and ...

Embodiment 3

[0056] A method for preparing high-stretch lignin-based carbon fibers comprises the following steps;

[0057] (1) Recovery of by-products in the cellulose production and purification process;

[0058] (2) Adding 6% of the lignin mass percentage to the by-products is 2:0.12:0.3 manganese peroxidase, saccharomyces and bacillus to carry out fermentation treatment for 2 days, centrifuge the fermentation broth, the speed of centrifugation is 7000r / min, centrifuge The time is 10 minutes, and the solid part is taken as fermented lignin after filtration;

[0059] (3) Add 0.4% of the lignin mass percentage to the fermented lignin, and the concentration is 0.5g / mL acetic anhydride, according to the liquid-solid ratio, add the mixture of dioxane and methanol of 4:1, centrifuge and filter to obtain After purifying the lignin, add 3% magnesium chlorate for oxidation treatment at a temperature of 200°C;

[0060] (4) Add 0.3% ferulic acid to the oxidized lignin, blend 0.2% polyethylene, ch...

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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...

Claims

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Application Information

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IPC IPC(8): D01F9/17C08H7/00D21C5/00
Inventor 龙晟候振华李恒文
Owner 佛山市石金科技有限公司
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