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Polyacrylonitrile carbon fiber prepared by using waste polyacrylonitrile fiber and preparation method thereof

A technology of polyacrylonitrile carbon fiber and polyacrylonitrile fiber, which is applied in the field of polyacrylonitrile carbon fiber and its preparation, can solve problems such as difficulty in passing and inapplicability, and achieve smooth spinning, reduced consumption, fiber formation and spinnability Good results

Inactive Publication Date: 2019-02-12
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diameter of phase change fibers is usually greater than 100 microns. The milky white spinning solution obtained by this method can be used to prepare phase change fibers, but it is not suitable for the preparation of polyacrylonitrile carbon fiber precursors with a diameter of only a dozen microns, and the production of carbon fiber precursors. The spinning solution must be a polyacrylonitrile solution. In order to prevent clogging the spinneret aperture and avoid insoluble impurities in the fiber, the polyacrylonitrile spinning solution must pass through a micron-level filtration system, and the milky white spinning solution is difficult to pass through.

Method used

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  • Polyacrylonitrile carbon fiber prepared by using waste polyacrylonitrile fiber and preparation method thereof
  • Polyacrylonitrile carbon fiber prepared by using waste polyacrylonitrile fiber and preparation method thereof
  • Polyacrylonitrile carbon fiber prepared by using waste polyacrylonitrile fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Get certain quality polyacrylonitrile waste silk that adopts dimethyl sulfoxide (DMSO) spinning solvent route, composition analysis finds, in waste silk, contain polyacrylonitrile 27.4%, dimethyl sulfoxide 12.8%, water 59.8% ( Indicates that it is waste silk before washing). Put the above fibers into water at a temperature of 50° C. and soak for 30 mins. The quality of the soaking water is 5 times that of the waste silk. Take it out and let it dry in the air for 3 hours, put it into a vacuum oven with a certain volume and multiple layers of drying racks, control the vacuum degree to be -0.09MPa, and the temperature in the oven is 90°C. In order to ensure the dehydration effect, spread the waste silk on the drying rack as much as possible. After dehydration for 2 hours, take out the waste silk and air it to room temperature, then weigh it. The mass reduction is 66.9% (the water in the waste silk is completely removed, and some dimethyl sulfoxide and water form an azeotr...

Embodiment 2

[0044] Take a certain quality of polyacrylonitrile waste silk that adopts the route of dimethylacetamide (DMAc) spinning solvent, composition analysis finds that the waste silk contains 33.1% of polyacrylonitrile and 66.9% of water (indicating that it is waste silk after washing) . Put the above-mentioned fibers into a vacuum oven with a certain volume and multiple layers of drying racks, control the vacuum degree to -0.05MPa, and the temperature in the oven to 60°C. In order to ensure the dehydration effect, spread the waste silk on the drying rack as much as possible. After dehydration for 8 hours, take out the waste silk and air it to room temperature, then weigh it, and the mass is reduced to 66.9% (moisture in the waste silk is completely removed).

[0045] The sandwich feeding method adds the solvent DMAc and the completely dehydrated waste polyacrylonitrile fiber into the dissolution kettle to ensure that the waste silk is in full contact with the solvent. The waste po...

Embodiment 3

[0048] Get certain quality polyacrylonitrile waste silk that adopts dimethylformamide (DMF) spinning solvent route, composition analysis finds, in waste silk, contain polyacrylonitrile 27.6%, dimethylformamide 12.4%, water 60.0% ( It shows that it is waste silk before washing). Put the above-mentioned fibers into a vacuum oven with a certain volume and multiple layers of drying racks, control the vacuum degree to -0.09MPa, and the temperature in the oven to 90°C. In order to ensure the dehydration effect, spread the waste silk on the drying rack as much as possible. After dehydration for 2 hours, the waste silk was taken out and aired to room temperature, and then weighed. Amide and water form an azeotrope to remove).

[0049]The sandwich feeding method adds the solvent DMF and the completely dehydrated waste polyacrylonitrile fiber into the dissolution kettle to ensure full contact between the waste silk and the solvent. Control the waste polyacrylonitrile fiber to account ...

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Abstract

The invention discloses a polyacrylonitrile carbon fiber prepared by using waste polyacrylonitrile fiber and a preparation method thereof, and the method comprises the following steps: (1) dehydratingthe waste polyacrylonitrile fiber to obtain a completely dehydrated waste polyacrylonitrile fiber; (2)chopping the fully dehydrated waste polyacrylonitrile fiber, mixing with a solvent, swelling at room temperature, stirring at a high temperature to prepare a polymer solution, filtering, and defoaming to obtain a spinning solution; (3) spinning the spinning solution to obtain a polyacrylonitrileraw silk; (4)pre-oxidizing and carbonizing the polyacrylonitrile raw silk to obtain a polyacrylonitrile carbon fiber. The method is adopted to obtain a completely dehydrated waste silk, a spinning solution of carbon fiber raw silk having a polyacrylonitrile mass concentration of 19-22% is prepared, and the raw silk prepared by the spinning solution is pre-oxidized and carbonized to finally obtaina polyacrylonitrile carbon fiber with linear density of 38 to 66 g / km, tensile strength of 3.8 to 5.6 GPa, and tensile modulus of 230 to 300 GPa.

Description

technical field [0001] The invention belongs to the technical field of carbon fibers, in particular, the invention relates to polyacrylonitrile carbon fibers prepared from waste polyacrylonitrile fibers and a preparation method thereof. Background technique [0002] Polyacrylonitrile (PAN) carbon fiber is the most important reinforcing material in advanced composite materials. Due to a series of excellent properties such as high specific strength and high specific modulus, it has been successfully used in aviation, aerospace, automobiles, machinery, chemicals, sports, In medical and other industries, countries all over the world have paid great attention to the development of polyacrylonitrile carbon fiber. [0003] After more than ten years of development, dozens of polyacrylonitrile carbon fiber research and production lines have been built in China. In a carbon fiber factory with a raw silk production line, due to various reasons, a large amount of PAN fiber waste is pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22
CPCD01F9/225
Inventor 李常清徐樑华陈洞张顺高爱君赵镇文王琦王宇童元建曹维宇
Owner BEIJING UNIV OF CHEM TECH
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