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Spinning method of polyacrylonitrile-based carbon fiber precursors

A technology of polyacrylonitrile-based carbon fiber and raw silk, which is applied in the directions of drawing spinning, fiber chemical characteristics, and single-component synthetic polymer rayon, etc. strength and strength, reducing the effect of the skin-core structure

Pending Publication Date: 2021-06-08
WEIHAI TUOZHAN FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the high modulus is produced by the carbonization process in the ultra-high temperature anaerobic environment in the graphite furnace, but this will have a certain impact on the strength of the fiber, which requires increasing the strength of the original silk as much as possible to compensate for the high modulus. Strength loss due to modulus

Method used

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  • Spinning method of polyacrylonitrile-based carbon fiber precursors

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Embodiment 1

[0033] The formulated mass concentration is 68% dimethyl sulfoxide deionized aqueous solution, and the temperature of the dimethyl sulfoxide deionized aqueous solution is maintained at 40 ± 1 ° C; then add deion ammonia water to the dimethyl sulfoxide deionized aqueous solution. Also a solid solution having a pH of 9.8.

[0034] The polyacrylonitrile spinning liquid is sprayed into the solidification liquid after spinning, and the initial fiber is obtained; after washing the obtained initial fiber, the dry temperature is maintained between 170 and 80 ° C and filled with nitrogen. In the machine, the thermal roller drafting is dried (drying the crystal densification time of 150s, the starting time of the thermal roller stretching is starting after the drying and densification, the heat roller is 1.3 times), then then The steam drafting (three times the steam drafting is 3 times) is heat-fixed, and the polyacrylonitrile carbon fiber is produced.

Embodiment 2

[0036] The formulated mass concentration is 68% dimethyl sulfoxide deionized aqueous solution, and the temperature of the dimethyl sulfoxide deionized aqueous solution is maintained at 40 ± 1 ° C; then add deion ammonia water to the dimethyl sulfoxide deionized aqueous solution. Also a solid solution having a pH of 9.8.

[0037] The polyacrylonitrile spinning material is sprayed into the solidification liquid after spinning, and the initial fiber is obtained; after washing the resulting initial fiber, it is placed in a dry temperature between 170 to 80 ° C and the air-filled steam heat roller drying. In the machine, the thermal roller drafting is dried (drying the crystal densification time of 150s, the starting time of the thermal roller stretching is starting after the drying and densification, the heat roller is 1.3 times), then then The steam drafting (three times the steam drafting is 3 times) is heat-fixed, and the polyacrylonitrile carbon fiber is produced.

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Abstract

The invention discloses a spinning method of polyacrylonitrile-based carbon fiber precursors. The spinning method includes the following steps: step 1, preparing a dimethyl sulfoxide aqueous solution with the mass concentration of 66-70%, and maintaining the temperature of the dimethyl sulfoxide aqueous solution at 38-42 DEG C; step 2, adding ammonia water into the dimethyl sulfoxide aqueous solution to obtain solidification liquid with the pH value of 9.5-10; step 3, spinning a polyacrylonitrile spinning stock solution, and then spraying into the solidification liquid to obtain nascent fibers; and step 4, washing the nascent fibers with water, putting the nascent fibers into a steam hot roller dryer, carrying out hot roller drafting, drying and densifying, and then carrying out steam drafting and heat setting to obtain the polyacrylonitrile-based carbon fiber precursors. According to the spinning method of the polyacrylonitrile-based carbon fiber precursors, the orientation degree and strength of the prepared precursors can be improved, and therefore the precursors can be used for preparing high-strength and high-modulus carbon fibers.

Description

Technical field [0001] The present invention belongs to the technical field of carbon fiber radioms, and more particularly to a spinning method having high strength and high modulus of polyacrylonitrile carbon fiber. Background technique [0002] Carbon fiber is a high-performance fiber material, and now is now widely used in aerospace, energy transportation, chemical construction materials and other fields. It is a key material in cutting-edge equipment such as aircraft, launch rocket, satellite, and innovation of carbon fiber. Advance, my country has more and more demand for high quality carbon fiber, especially for high-strength high modulus of carbon fiber requirements. [0003] However, the high modulus is produced in the carbonization process in the graphite furnace in an ultra-high temperature oxygen, but this will have a certain impact on the strength of the fibers, which requires as big as possible to improve the strength of the original wire to make up for high The stre...

Claims

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Application Information

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IPC IPC(8): D01F6/18D01D5/12D01D5/16D01D10/02D01D10/06
CPCD01F6/18D01D5/14D01D5/16D01D10/02D01D10/06
Inventor 沙玉林李日滨勇国庆申培芳
Owner WEIHAI TUOZHAN FIBER
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