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Method for preparing polyacrylonitrile-based carbon fiber precursors without skin-core structure

A technology for spinning polyacrylonitrile-based carbon fibers and polyacrylonitrile is applied in spinning solution preparation, fiber processing, drawing spinning and other directions, which can solve the problems of unfavorable comprehensive performance of precursors, increase of precursor pores, and reduction of production costs. and other problems, to achieve the effect of less defects, increased stretching ratio, and improved production efficiency

Inactive Publication Date: 2012-11-07
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although such a gel spinning method reduces the difference in the skin-core structure of the raw silk and improves the tensile properties of the raw silk to a certain extent, the reduction of the polymer content in the spinning dope will lead to The increase and increase of holes is not conducive to the improvement of the comprehensive performance of the original silk
In addition, a low-temperature coagulation bath is required, and the energy consumption is high, which is not conducive to the reduction of production costs

Method used

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  • Method for preparing polyacrylonitrile-based carbon fiber precursors without skin-core structure
  • Method for preparing polyacrylonitrile-based carbon fiber precursors without skin-core structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 21% (mass percentage based on the sum of the three substances) of polystyrene with a viscosity-average molecular weight of 78,000 in the dimethyl sulfoxide / water mixed solvent of 5% (based on the percentage of total mass of dimethyl sulfoxide and water) containing water. Acrylonitrile resin, stirred at a constant speed at 50°C for 3 hours to disperse and swell, stirred at 70°C for 5 hours to fully dissolve, then stood at 70°C for defoaming, and placed in a dry environment at 25°C Mature at a medium constant temperature for 3 hours, extrude through a spinneret on a twin-screw extruder, pass through a 3cm air section, and then enter a methanol extraction bath at a temperature of 25°C to solidify and form, and control the winding speed of the winding roller and the extrusion speed of the stock solution The ratio is 10. The as-spun filaments were washed and stretched 1.5 times in a water bath at 40°C, stretched 2 times and 2.5 times in hot water at 80°C and 95°C in turn...

Embodiment 2

[0035] In the dimethylacetamide / water mixed solvent of 1% (based on the percentage of total mass of dimethylacetamide and water) containing water, add 23% (based on the mass percentage of the sum of the three substances) of polystyrene with a viscosity-average molecular weight of 78000 Acrylonitrile resin, stirred at a constant speed at 50°C for 3 hours to disperse and swell, stirred at 75°C for 5 hours to fully dissolve, then stood at 75°C for defoaming, and placed in a dry environment at 25°C Mature at a medium constant temperature for 2 hours, extrude through the spinneret on the twin-screw extruder, pass through a 3cm air section, and then enter the methanol extraction bath with a temperature of 25°C to solidify and form, and control the winding speed of the winding roller and the extrusion speed of the stock solution The ratio is 10. The as-spun filaments were washed and stretched 1.5 times in a water bath at 40°C, stretched 2 times and 2.5 times in hot water at 80°C and ...

Embodiment 3

[0037]Add 23% (mass percentage based on the sum of the three substances) of polystyrene with a viscosity-average molecular weight of 78,000 in the dimethyl sulfoxide / water mixed solvent of 5% (based on the percentage of total mass of dimethyl sulfoxide and water) containing water. Acrylonitrile resin, stirred at a constant speed at 50°C for 3 hours to disperse and swell, stirred at 80°C for 5 hours to fully dissolve, then stood at 80°C for defoaming, and placed in a dry environment at 25°C Mature at a medium constant temperature for 2 hours, extrude through a spinneret on a twin-screw extruder, pass through a 3cm air section, and enter a methanol / ethanol extraction bath with a temperature of 20°C and a methanol content of 80% by mass to solidify and form. The ratio of the winding speed of the winding roll to the dope extrusion speed is 12. The as-spun filaments were washed and stretched 1.8 times in a water bath at 40°C, stretched 2 times and 2.5 times in hot water at 85°C and...

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Abstract

The invention provides a method for preparing polyacrylonitrile-based carbon fiber precursors without a skin-core structure and belongs to the technical field of carbon fiber precursors. The method comprises the followings steps of: evenly mixing water or alcohol compounds and an organic solvent, adding polyacrylonitrile resin in the mixed solution, performing the heated swelling dissolution treatment, and filtering the mixed solution to obtain polyacrylonitrile spinning solution; and ageing the polyacrylonitrile spinning solution, performing spraying and extrusion to obtain primary precursors, and performing water-washing stretching, second-level hot water stretching, drying densification and saturated steam stretching of the primary precursors in sequence to obtain the polyacrylonitrile-based carbon fiber precursors. By the method, the good-quality polyacrylonitrile-based carbon fiber precursors having the advantages of no skin-core structure, less defects, small fiber number and high strength can be mass produced in large scale in the conventional industrialized spinning equipment, and the production cost can be effectively lowered.

Description

technical field [0001] The invention relates to a method in the technical field of carbon fiber precursors, in particular to a method for preparing polyacrylonitrile-based carbon fiber precursors without a sheath-core structure. Background technique [0002] The unique properties of carbon fiber make it widely used in aerospace, sports, construction and other fields. Polyacrylonitrile (PAN)-based carbon fiber is the most widely used carbon fiber with the best development prospects. As the precursor of polyacrylonitrile-based carbon fiber, the quality of polyacrylonitrile precursor largely determines the performance of polyacrylonitrile-based carbon fiber. At present, polyacrylonitrile precursors are usually prepared by wet or dry-wet spinning (Chinese patent CN101165238A, Japanese patent JP11-152618). The raw silks produced by these two traditional spinning methods have obvious differences in skin-core structure, that is, the skin layer is dense and the core layer is loose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/18D01F9/22D01D1/02D01D1/10D01D5/00D01D5/12
Inventor 万锕俊谭连江潘鼎
Owner SHANGHAI JIAOTONG UNIV
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