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A kind of preparation method of lignin-based carbon fiber

A plain-based carbon fiber and lignin technology, which is applied in the field of low-cost carbon fiber preparation, can solve problems such as inability to large-scale production and unsolved lignin, and achieve continuous production, good spinnability, and avoidance of the use of organic solvents. Effect

Active Publication Date: 2017-01-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of removal of volatile components in lignin and the brittle nature of lignin, it is limited to use laboratory equipment for extrusion and cannot be mass-produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of lignin-based carbon fiber, the specific steps are: dissolving 600g of kraft lignin in 2.5L of NaOH solution with pH=12, and filtering with ceramic membrane filtration equipment, the filtration accuracy is 0.45 μm, and the filtration temperature is 50 ℃. Adjust the pH of the filtrate to 2 with sulfuric acid, and filter under pressure to obtain a lignin precipitate. The precipitate was repeatedly washed and filtered with deionized water to obtain neutral lignin. Vacuum drying at 80 °C for 24 h to obtain dry purified lignin. The lignin is extruded through a twin-screw extruder equipped with a vacuum pump to remove volatile components and then granulated. The screw temperature is 100-240°C, and the vacuum degree of the vacuum pump is less than 20mbar to obtain lignin slices. Take 400g of purified lignin slices to remove volatile components and 100g of dried polyethylene terephthalate (intrinsic viscosity is 0.68dL / g, molecular weight distribution i...

Embodiment 2

[0028] A preparation method of lignin-based carbon fiber, the specific steps are: dissolving 600g of kraft lignin in 2.5L of NaOH solution with pH=12, and filtering with ceramic membrane filtration equipment, the filtration accuracy is 0.14 μm, and the filtration temperature is 60 ℃. Adjust the pH of the filtrate to 3 with sulfuric acid, and filter under pressure to obtain a lignin precipitate. The precipitate was repeatedly washed and filtered with deionized water to obtain neutral lignin. Vacuum drying at 80 °C for 24 h to obtain dry purified lignin. The lignin is passed through a twin-screw extruder equipped with a vacuum pump capable of vacuuming to remove volatile components and then granulated. The screw temperature is 100-230° C., and the vacuum degree of the vacuum pump is less than 20 mbar to obtain lignin slices. Take 400g of purified lignin chips from which volatile components have been removed and 200g of dried polypropylene (weight-average molecular weight 156,0...

Embodiment 3

[0030] A preparation method of lignin-based carbon fiber, the specific steps are: dissolving 600g of kraft lignin in 2.5L of NaOH solution with pH=12, and filtering with ceramic membrane filtration equipment, the filtration precision is 300KDa, and the filtration temperature is 70°C . Adjust the pH of the filtrate to 3 with sulfuric acid, and filter under pressure to obtain a lignin precipitate. The precipitate was repeatedly washed and filtered with deionized water to obtain neutral lignin. Vacuum drying at 80 °C for 24 h to obtain dry purified lignin. The lignin is removed volatile components through a twin-screw extruder equipped with a vacuum pump to realize vacuuming function and then granulated. The screw temperature is 100-220°C, and the vacuum degree of the vacuum pump is less than 20mbar to obtain lignin slices. Take 400g of purified lignin slices from which volatile components have been removed and 300g of dried polylactic acid, and melt-spin with a sheath-core mel...

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Abstract

The invention provides a preparation method of a lignin-based carbon fiber. The preparation method of the lignin-based carbon fiber comprises the following steps: dissolving lignin in an alkaline solution, filtering by using a ceramic membrane filtration device, adjusting pH value of a filtrate until the filtrate is acidic to obtain a lignin precipitate, washing and drying the lignin precipitate to obtain purified lignin; extruding the dried and purified lignin at 100-260 DEG C by a twin-screw extruder, removing volatile components and prilling; taking a thermoplastics polymer as a skin layer, taking lignin slices as a core layer to melt and spin by a melting and spinning device, wherein the spinning temperature of the thermoplastics polymer is 160-350 DEG C; the spinning temperature of the lignin is 160-260 DEG C; the mass ratio of the thermoplastics polymer adopted by the skin layer to the lignin slices adopted by the core layer is (1 to 9)-(9 to 1); oiling, curing, pre-oxidizing and carbonizing the fiber with a skin-core structure to obtain the lignin-based carbon fiber. The lignin-based carbon fiber has the advantages of being high in spinning property, small in diameter, high in strength, low in production cost and applicable to continuous production.

Description

technical field [0001] The invention belongs to the field of preparation of low-cost carbon fibers, and in particular relates to a method for preparing lignin-based carbon fibers by adopting a melting sheath-core spinning method. Background technique [0002] Carbon fiber has attracted much attention due to its high strength, low density, high temperature resistance, and aging resistance. At present, it is mainly made of petroleum-based polyacrylonitrile through solution spinning and carbonization. The production cost is relatively high, and it also causes certain damage to the environment. Pollution, mainly used in high-end fields such as aerospace. With the shortage of petroleum resources and the expansion of carbon fiber application fields, it is particularly important to develop low-cost non-petroleum-based carbon fibers. [0003] As the main component of trees, lignin is second only to cellulose in content, and currently exists mainly as waste from the paper industry. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/17D01F11/16
Inventor 朱美芳王世超李妍相恒学张天江
Owner DONGHUA UNIV
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