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Solidification forming method of polyacrylonitrile-based carbon fiber precursors with high orientation degree and high fine denier

A polyacrylonitrile-based carbon fiber, coagulation molding technology, applied in the wet spinning method, spinning solution preparation, etc., can solve the problems of positive draft ratio restriction, spinneret stability, etc., to achieve fine grain structure, reduce Parallel phenomenon, easy to use effect

Active Publication Date: 2016-09-28
ZHONGFU SHENYING CARBON FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional dry-spray-wet method adopts one-stage coagulation bath forming, which can achieve high pre-drawing, but due to the influence of the stability of the spinneret, the positive draft is greatly restricted. Draw ratio, the traditional dry-spray-wet molding method can no longer satisfy

Method used

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  • Solidification forming method of polyacrylonitrile-based carbon fiber precursors with high orientation degree and high fine denier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Control the temperature of the nozzle at 25°C, make the stock solution with a viscosity of 150pa.s, a solid content of 15%, and a pH value of 9.5. The solvent of the stock solution is dimethyl sulfoxide, and enter 5cm of air at a spinning speed of 30m / min. Layer, the tow enters the primary coagulation bath of 30% ethylene glycol aqueous solution, the temperature of the primary coagulation bath is set at -25°C, the bath liquid is 30% ethylene glycol aqueous solution, and the residence time is 4s, the surface will quickly exceed Deep quenching produces a dense dura mater, and the drafting ratio is 0.995-1.02 times;

[0030] Finally, under the flat turbine and the positioner, the positioner controls the width of the silk path to be 7cm and enters the secondary coagulation bath. The residence time is 5-10s, and the drafting ratio is 1.5-2.0 times;

[0031] The temperature of the third-stage coagulation bath is 5-2°C, the concentration of the coagulation bath is 10-40%, the...

Embodiment 2

[0033] Control the temperature of the nozzle at 20°C, make the stock solution with a viscosity of 160pa.s, a solid content of 24.5%, and a pH value of 9.0. The solvent of the stock solution is dimethylformamide, and enter 3cm of air at a spinning speed of 25m / min. layer, the tow enters the primary coagulation bath of 30% ethylene glycol aqueous solution, the temperature of the primary coagulation bath is set to 0°C, and the bath liquid is 30% ethylene glycol aqueous solution; the residence time is 8s, and the surface will rapidly exceed the depth Quenching produces a dense dura mater, and the drafting ratio is 0.995-1.02 times;

[0034] Finally, under the flat turbine and the positioner, the positioner controls the width of the silk path to be 4cm and enters the secondary coagulation bath. The residence time is 5-10s, and the draw ratio is 1.5-2.0 times; after the second grade, the positive draw ratio is 6.5 times; after washing, water drawing, oiling, drying, steam drawing, a...

Embodiment 3

[0036] Control the temperature of the nozzle at 30°C, make the stock solution with a viscosity of 200pa.s, a solid content of 22%, and a pH value of 9.5. The solvent of the stock solution is dimethyl sulfoxide, and enter an air layer of 8cm at a spinning speed of 40m / min. , the tow enters the primary coagulation bath of 30% ethylene glycol aqueous solution, the temperature of the primary coagulation bath is set to -30°C, and the bath liquid is 30% ethylene glycol aqueous solution; the residence time is 5s, and the surface will quickly exceed the depth Quenching produces a dense dura mater, and the drafting ratio is 0.995-1.02 times;

[0037] Finally, under the flat turbine and the positioner, the positioner controls the width of the silk path to be 9cm and enters the secondary coagulation bath. The residence time is 4-8s, the draft ratio is 2-2.5 times, and the positive draft ratio after the second grade is 7.2 times; after washing, water drawing, oiling, drying, steam drawing...

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Abstract

The invention relates to the technical field of preparation of polyacrylonitrile-based carbon fiber precursors, in particular to a solidification forming method of polyacrylonitrile-based carbon fiber precursors with high orientation degree and high fine denier. The method specifically comprises four steps including pretreatment of a spinning solution, primary solidification, secondary solidification and solidification after secondary solidification. The homogeneity of the polyacrylonitrile-based carbon fiber precursors obtained with the provided solidification forming method is good, the orientation degree and the draft multiple are high, and the fine denier degree of the precursors is high.

Description

technical field [0001] The invention relates to the technical field of polyacrylonitrile-based carbon fiber precursor preparation technology, in particular to a method for coagulating and forming polyacrylonitrile-based carbon fiber precursors with high degree of orientation and high denier. Background technique [0002] Carbon fiber is a high-tech special reinforcing fiber with a carbon content of more than 95% and a high-strength, high-modulus fiber. Carbon fiber is "soft on the outside and rigid on the inside". It is lighter in weight than metal aluminum, but its strength is higher than steel. It is widely used in national defense and civilian applications. Polyacrylonitrile-based carbon fiber is the most promising precursor for the production of high-performance carbon fiber. The production process of polyacrylonitrile-based carbon fiber mainly includes two processes: precursor production and precursor carbonization; that is, processed by acrylonitrile polymerization and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D1/02D01D5/06
CPCD01D1/02D01D5/06
Inventor 陈秋飞连峰刘栋夏新强庄二祥
Owner ZHONGFU SHENYING CARBON FIBER
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