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Lignin/nanocellulose-based carbon fiber and preparation method thereof

A nanocellulose, carbon fiber-based technology, applied in spinning solution preparation, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of weak tensile and shear flow fields, poor mechanical properties of carbon fibers, etc., and achieve perfect crystallization, High degree of carbon crystal orientation and the effect of solving structural irregularities

Active Publication Date: 2020-11-24
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, composite spinning gels were obtained by mixing nanocellulose with lignin, and all-bio-based carbon fibers were also prepared using traditional wet spinning techniques, however, due to the stretching and shear flow fields of traditional wet spinning weak, and the fiber structure of the carbon fiber precursor is relatively loose, resulting in poor mechanical properties of lignin / nanocellulose-based carbon fibers prepared by wet spinning (L. Wang, M. Ago, M. Borghei, A. Ishaq, A. C. Papageorgiou, M. Lundahl and O. J. Rojas, ACS Sustainable Chemistry & Engineering , 2019, 7, 6013-6022.)

Method used

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  • Lignin/nanocellulose-based carbon fiber and preparation method thereof
  • Lignin/nanocellulose-based carbon fiber and preparation method thereof
  • Lignin/nanocellulose-based carbon fiber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) Preparation of nanocellulose

[0036] Disperse 10g of bleached jute fiber in 960ml of water, and keep stirring, then add 0.3g of NaBr and 0.06g of TEMPO, keep stirring until completely dissolved, finally, add 39g of NaClO aqueous solution, the TEMPO oxidation reaction of cellulose begins, keep stirring during the reaction And monitor the pH value of the reaction system with a pH meter. As the reaction progresses, the pH value of the system continues to drop, and the pH value of the reaction system is kept between 10-10.3 by continuously adding 1mol / L NaOH aqueous solution dropwise. The entire reaction lasts for 24 hours to complete the reaction completely, and then add 2 ml Absolute ethanol was used to terminate the reaction, and the whole reaction was carried out at room temperature. Then it was washed to neutrality by centrifugation, and finally homogenized with a homogenizer at 800W to obtain a cellulose nanofiber hydrogel, which was diluted with deionized water...

Embodiment 2

[0048] In the lignin / nanocellulose spinning solution prepared in step (3), the proportion of lignin was 50 wt%, and the rest of the steps were the same as in Example 1.

[0049] The tensile strength of the carbon fiber precursor prepared in this example is 431.89±12.56MPa, the tensile strength of the prepared carbon fiber is 1214.93±19.43MPa, and the electrical conductivity is 159.3±6.53 S / cm.

Embodiment 3

[0051] In the lignin / nanocellulose spinning solution prepared in step (3), the proportion of lignin is 75wt%, and the rest of the steps are the same as in Example 1.

[0052] The tensile strength of the carbon fiber precursor prepared in this example is 276.01±6.25 MPa, the tensile strength of the prepared carbon fiber is 1635±56.7 MPa, and the electrical conductivity is 185.33±3.62 S / cm.

[0053] It can be seen from Examples 1-3 that during the spinning process, lignin / nanocellulose is highly oriented and assembled under the action of the tensile force field in the converging flow channel, and the positively charged chitosan and negatively charged lignin / nanocellulose The ionic crosslinking of cellulose fixes the orientation structure of fibers, such as figure 2 It is shown that the tensile strength of carbon fiber precursors decreases gradually with the increase of lignin content. When the lignin content was 75 wt%, the tensile strength of the prepared carbon fiber precurs...

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Abstract

The invention discloses lignin / nanocellulose-based carbon fiber and a preparation method thereof. The preparation method comprises the following steps that 1) nanocellulose with a high length-diameterratio and with negative charges on the surface is prepared through a TEMPO / NaBr / NaClO oxidation system, and sodium lignosulfonate and the nanocellulose are mixed in proportion to obtain a lignin / nanocellulose composite spinning solution; 2) in the process of microfluid complex spinning, the lignin and the nanocellulose are assembled in a highly-orientated mode in the flow direction under the action of a tensile flow field, and at the same time, chitosan with positive charges is used to cross-link the lignin and the nanocellulose in situ to obtain lignin / nanocellulose precursor fiber; and 3) pre-oxidation and carbonization treatment of the precursor fiber are carried out in a tube furnace to obtain bio-based carbon fiber with high strength and high electroconductivity. The lignin / nanocellulose-based carbon fiber prepared by the preparation method is perfect in crystallization, high in carbon crystal orientation, and excellent in tensile strength and electrical conductivity, and solvesthe problems of poor mechanical properties and low electrical conductivity of lignin-based carbon fiber.

Description

technical field [0001] The invention relates to the technical field of carbon fiber preparation, in particular to a lignin / nanocellulose-based carbon fiber and a preparation method thereof. The carbon fiber prepared by the invention is mainly used in fields such as military industry, mechanical electronics and composite materials. Background technique [0002] Due to the characteristics of excellent mechanical properties, low density and high electrical conductivity, carbon fiber has played an important role in strategic fields such as aerospace, automobile industry, and high-end sports equipment, and further expanded its application prospects. The precursor material of carbon fiber is mainly polyacrylonitrile (PAN). With the depletion of petroleum resources and the increasingly severe environmental problems, the development of bio-based carbon fiber is of great significance. Lignin is the second largest natural polymer material after cellulose in nature. It has the advanta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/16D01F9/17D01F9/14D01D1/02
CPCD01F9/16D01F9/17D01F9/14D01D1/02
Inventor 耿立宏蔡育华彭响方黄岸刘洋肖丹
Owner FUJIAN UNIV OF TECH
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