Method for preparing polyacrylonitrile-based carbon fiber precursor fiber

A polyacrylonitrile-based carbon fiber and carbon fiber technology, applied in the direction of fiber chemical characteristics, single-component synthetic polymer rayon, wet spinning method, etc., can solve the problem of low yield of polyacrylonitrile raw silk, easy gelation in the production process, Adjacent fibers are bonded to each other to prolong the swelling time of the slurry, which is beneficial to smoothness and stable flow direction

Active Publication Date: 2008-04-16
吉林碳谷碳纤维股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of polyacrylonitrile precursors by this method is low, and the polymerization process is difficult to control, and gels are prone to occur during the production process, resulting in unstable properties of the precursors.
[0005] As the spinning method, dry-wet spinning is generally used, since the dry-wet spinning method i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] The PAN powder was prepared by a two-step suspension copolymerization of inorganic redox aqueous phase, mixed with dimethylacetamide at -18°C to prepare a slurry with a solid content of 16wt%, and vacuumed to 40Kpa, heated to 45°C, After dissolving for 1 hour, a spinning stock solution with a solid content of 16% is obtained (this solution can be stored for 24 hours), and then the spinning solution is heated to 70 ° C, transported to the spinning metering pump, and squeezed into the 3000-hole spinneret. In a spinning tube with a dimethylacetamide concentration of 50 wt % and a temperature of 50° C. in a coagulation bath, a negative draft of 0.2% was performed, and wet spinning was performed.

[0020] The nascent fibers were washed 6 times with hot water at 80-90°C and 4 times with water at 91-100°C. After rinsing and removing the solvent, they were simultaneously stretched at a total draw ratio of 6.98 times of water washing and drafting, and the fibe...

Example Embodiment

[0021] Example 2

[0022] The PAN powder was prepared by a two-step suspension copolymerization of inorganic redox aqueous phase, mixed with dimethylacetamide at -18°C to prepare a slurry with a solid content of 20wt%, and vacuumed to 65Kpa, and heated to 45°C, After dissolving for 1 hour, a spinning stock solution with a solid content of 16% is obtained (this solution can be stored for 24 hours), and then the spinning solution is heated to 70 ° C, transported to the spinning metering pump, and squeezed into the 3000-hole spinneret. In a spinning tube with a dimethylacetamide concentration of 60 wt % and a temperature of 45° C. in a coagulation bath, a negative draft of 0.2% was performed, and wet spinning was performed.

[0023] The nascent fibers were washed 6 times with hot water at 80-90°C and 4 times with water at 91-100°C. After rinsing and removing the solvent, they were simultaneously stretched at a total draw ratio of 6.98 times of water washing and drafting, and the ...

Example Embodiment

[0024] Example 3

[0025] The PAN powder is obtained by a two-step suspension copolymerization of inorganic redox aqueous phase, mixed with dimethylacetamide at -9°C to prepare a slurry with a solid content of 16wt%, and vacuumed to 95Kpa, and heated to 55°C, After 1 hour of dissolving, a spinning stock solution with a solid content of 16% is obtained (this solution can be stored for 24 hours), and then the spinning solution is heated to 80 ° C, transported to the spinning metering pump, and squeezed into the 3000-hole spinneret. In a spinning tube with a concentration of dimethylacetamide of 70 wt % and a temperature of 40° C. in a coagulation bath, and a negative draft of 0.4%, wet spinning was performed.

[0026] The nascent fibers were washed 6 times with hot water at 80-90°C and 4 times with water at 91-100°C. After rinsing and removing the solvent, they were simultaneously stretched at a total draw ratio of 6.98 times of water washing and drafting, and the fibers were im...

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Abstract

The invention provides a preparation method for polyacrylonitrile base carbon fiber protofilament. ammonium persulfate-ammonium sulfite or ammonium hydrogen sulfite is used as the aqueous phase suspension copolymerization of a initiation system for preparing polyacrylonitrile base carbon fiber protofilament which uses polymers as raw materials; polymers are made into 16-20Wt percent of slurry at -18-0 DEG C, vacuumized to 40-95 Kpa and dissolved for 1-2 hours at 40-55 DEG C; then spinning stock solution at 70-80 DEG C is extruded into a spinning pipe in coagulation bath via a spinneret to be shaped, and PAN nascent fiber is obtained through the minus elongation of the coagulation bath; the PAN nascent fiber has desolventize flushed away by hot water, and is simultaneously stretched, oiled, dried for densification, baked and elongated to obtain PAN base protofilament, and the tensile strength is no lower than 6.60N/dtex; the carbon fiberstrength is 3.30-4.01Gpa, and the elastic modulus is 210-262Gpa. The main technical indexes of the present invention are equivalent to the similar products in America, Japan and other countries.

Description

technical field [0001] The invention relates to a method for preparing synthetic fiber precursors, in particular to a method for preparing polyacrylonitrile-based carbon fiber precursors. technical background [0002] Carbon fiber is a reinforced and functional fiber material with high strength ratio and high specific modulus. It is a high-tech product developed rapidly in the 1960s. It has a series of comprehensive properties such as low density, heat resistance, chemical corrosion resistance, friction resistance, thermal shock resistance, electrical conductivity, heat conduction, radiation resistance, good damping, shock absorption, and noise reduction. At present, it is widely used in sports equipment, entertainment and leisure, tourist facilities, automobile components, train parts, aircraft manufacturing, electric power, petroleum, chemical industry, navigation, biomedicine, construction, strategic missiles, bulletproof armor and other fields. Therefore, improving the ...

Claims

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Application Information

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IPC IPC(8): D01F6/18D01F9/22D01D5/06
Inventor 王进军马俊庄海林刘明哲王继军周宝庆
Owner 吉林碳谷碳纤维股份有限公司
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