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Preparation method of high-performance polyacrylonitrile-based carbon fiber precursor

A polyacrylonitrile-based carbon fiber and polyacrylonitrile spinning technology, which is applied in the direction of drawing spinning, artificial filament heat treatment, etc., can solve the problems such as the related reports on the preparation method of polyacrylonitrile-based carbon fiber precursor, etc. The effect of increasing the degree of orientation, increasing the spinning speed, and increasing the production efficiency

Inactive Publication Date: 2013-04-03
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, there have been no relevant reports similar to the preparation method of polyacrylonitrile-based carbon fiber precursors described in this patent

Method used

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  • Preparation method of high-performance polyacrylonitrile-based carbon fiber precursor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A polyacrylonitrile resin with a weight-average molecular weight of 2,730,000 and a molecular weight distribution of 2.81 was added into dimethylformamide, and stirred at 50°C for 2 hours to obtain a dilute ultra-high molecular weight polyacrylonitrile solution with a mass concentration of 0.5%. A polyacrylonitrile resin with a weight average molecular weight of 105,000 and a molecular weight distribution of 2.33 was dissolved in the dilute polyacrylonitrile solution, stirred at 55°C for 2 hours, and then stirred at 80°C for 5 hours to obtain a spinning dope. The spinning stock solution is extruded through the spinneret, and after passing through a 2cm air section, it enters a dimethylformamide / water coagulation bath with a temperature of 25°C and a mass concentration of dimethylformamide of 40% for coagulation and formation. The ratio of the winding speed of a winding roller to the stock solution extrusion speed is 18. The as-spun filaments were washed and stretched 1....

Embodiment 2

[0034] A polyacrylonitrile resin with a weight average molecular weight of 21100000 and a molecular weight distribution of 2.55 was added into dimethylformamide, and stirred at 55°C for 2 hours to obtain a dilute ultrahigh molecular weight polyacrylonitrile solution with a mass concentration of 1%. A polyacrylonitrile resin with a weight average molecular weight of 85,000 and a molecular weight distribution of 2.50 was dissolved in the dilute polyacrylonitrile solution, stirred at 60°C for 2 hours, and then stirred at 80°C for 5 hours to obtain a spinning dope. The spinning stock solution is extruded through the spinneret, and after passing through a 2cm air section, it enters a dimethylformamide / water coagulation bath with a temperature of 25°C and a mass concentration of dimethylformamide of 40% for coagulation and formation. The ratio of the winding speed of a winding roller to the extrusion speed of the stock solution is 15. The as-spun filaments were washed and stretched ...

Embodiment 3

[0036]A polyacrylonitrile resin with a weight average molecular weight of 1,690,000 and a molecular weight distribution of 3.06 was added to dimethyl sulfoxide, and stirred at 50° C. for 2 hours to obtain a dilute solution of ultrahigh molecular weight polyacrylonitrile with a mass concentration of 1%. A polyacrylonitrile resin with a weight average molecular weight of 143,000 and a molecular weight distribution of 2.61 was dissolved in the dilute polyacrylonitrile solution, stirred at 55°C for 3 hours, and then stirred at 75°C for 5 hours to obtain a spinning dope. The spinning stock solution is extruded through the spinneret, and after passing through a 2cm air section, it enters a dimethyl sulfoxide / water coagulation bath with a temperature of 25°C and a mass concentration of dimethyl sulfoxide of 50% for coagulation and formation. The ratio of the winding speed of a winding roller to the extrusion speed of the stock solution is 12. The as-spun filaments were washed and str...

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Abstract

The invention relates to a preparation method of a high-performance polyacrylonitrile-based carbon fiber precursor. The method provided by the invention comprises the following steps of: (1) dissolving less high-performance polyacrylonitrile resin into a diluted polyacrylonitrile solution; (2) dissolving certain amount of polyacrylonitrile with conventional molecular weight into the diluted polyacrylonitrile solution with super-high molecular weight to obtain a polyacrylonitrile spinning solution; (3) obtaining a polyacrylonitrile carbon fiber precursor through utilizing a dry-wet spinning method; and (4) washing the primary precursor by water, stretching, carrying out a second-grade stretching by hot water, drying and densifying, and stretching by saturated steam to obtain the high-performance polyacrylonitrile-based carbon fiber precursor. Compared with the prior art, the method provided by the invention can prepare the good-quality polyacrylonitrile-based carbon fiber precursor with high strength, high modulus, high orientation degree and small fineness.

Description

technical field [0001] The invention belongs to a method for preparing carbon fiber precursors, in particular to a method for preparing high-performance polyacrylonitrile-based carbon fiber precursors. Background technique [0002] Carbon fiber has the characteristics of high strength and high modulus, high temperature resistance, corrosion resistance, fatigue resistance, radiation resistance, and electrical conductivity. It is widely used in aerospace, missiles, building materials, auto parts, sports equipment and other fields and products. 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. The quality of polyacrylonitrile precursor depends on polyacrylonitrile polymer, spinning dope and spinning forming process. At present, the meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/54D01F1/10D01D5/14D01D10/02D01F9/22
Inventor 万锕俊谭连江姜会钰潘鼎
Owner SHANGHAI JIAOTONG UNIV
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