6k polyacrylonitrile-based carbon fibre manufacturing method

A technology of polyacrylonitrile-based carbon fiber and a manufacturing method, which is applied in the field of preparation of high-performance polyacrylonitrile-based carbon fiber, can solve the problems of high energy consumption, cumbersome production process, poor stability and the like, and achieves high mechanical properties, small coefficient of variation, High density effect

Inactive Publication Date: 2013-08-07
XIAN KANGBEN MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of cumbersome production process, poor stability and high energy con...

Method used

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  • 6k polyacrylonitrile-based carbon fibre manufacturing method
  • 6k polyacrylonitrile-based carbon fibre manufacturing method
  • 6k polyacrylonitrile-based carbon fibre manufacturing method

Examples

Experimental program
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Embodiment 1

[0032] This embodiment is a method for manufacturing 6k polyacrylonitrile-based carbon fibers.

[0033] Step 1, the preparation of raw silk:

[0034] The first step is to prepare spinning solution. In the polymerization kettle, dimethyl sulfoxide (DMSO) was used as a solvent, and acrylonitrile, methyl acrylate, itaconic acid, 2-acrylamide and 2-methyl propanesulfonic acid, for the reaction. The polymerization reaction temperature was 60° C., and the reaction time was 26 hours to obtain a spinning solution. The average molecular weight of the spinning solution is 50,000, the molecular weight distribution is 2.8, and the solid content of the spinning solution is 21.14%.

[0035] The second step is spinning. Wet spinning is carried out by a spinning system known in the art. The wet spinning is to obtain the required fiber filaments after the spinning solution is passed through a coagulation bath. In this embodiment, the coagulation bath has two stages. specifically is:

...

Embodiment 2

[0072] This embodiment is a method for manufacturing 6k polyacrylonitrile-based carbon fibers.

[0073] Step 1, the preparation of raw silk:

[0074]The first step is to prepare spinning solution. In the polymerization kettle, dimethyl sulfoxide (DMSO) was used as a solvent, and acrylonitrile, methyl acrylate, itaconic acid, 2-acrylamide and 2-methyl propanesulfonic acid, for the reaction. The polymerization reaction temperature was 58° C., and the reaction time was 20 h to obtain a spinning solution. The average molecular weight of the spinning solution is 48,000, the molecular weight distribution is 2.7, and the solid content of the spinning solution is 20.14%.

[0075] The second step is spinning. Wet spinning is carried out by a spinning system known in the art. The wet spinning is to obtain the required fiber filaments after the spinning solution is passed through a coagulation bath. In this embodiment, the coagulation bath has two stages. specifically is:

[0076...

Embodiment 3

[0112] This embodiment is a method for manufacturing 6k polyacrylonitrile-based carbon fibers.

[0113] Step 1, the preparation of raw silk:

[0114] The first step is to prepare spinning solution. In the polymerization kettle, dimethyl sulfoxide (DMSO) was used as a solvent, and acrylonitrile, methyl acrylate, itaconic acid, 2-acrylamide and 2-methyl propanesulfonic acid, for the reaction. The polymerization reaction temperature was 63° C., and the reaction time was 30 h to obtain a spinning solution. The average molecular weight of the spinning solution is 52,000, the molecular weight distribution is 2.95, and the solid content of the spinning solution is 23.14%.

[0115] The second step is spinning. Wet spinning is carried out by a spinning system known in the art. The wet spinning is to obtain the required fiber filaments after the spinning solution is passed through a coagulation bath. In this embodiment, the coagulation bath has two stages. specifically is:

[01...

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Abstract

The invention provides a 6k polyacrylonitrile-based carbon fibre manufacturing method, which employs a routine method for obtaining a protofilament, and the carbon fiber is obtained by pre-oxidation, low temperature carbonization and high temperature carbonization of the protofilament. A spinning stock solution of the present invention employs a four-element formula, thereby improving the homogenization degree of the spinning stock solution in the solidification moulding process, and minimizing the performance variation coefficient of the protofilament. A copolymerization monomer is added during pre-oxidation, and reaction speeds of pre-oxidation and carbonization are increased, and the loop strength and modulus of carbon fiber are increased with smaller coefficient of variation by employing a low-carbon low-temperature and high draft ratio, and the tensile strength of the carbon fiber is substantially improved. In the low temperature and high temperature carbonization process, the matching of temperature and draft ratio is adjusted, thereby the tension force of the fiber in the operation process reaches the expected requirements that the low temperature carbonization tension force is 600CN and the high temperature carbonization tension force is 640CN, and the tension force of fiber in the operation process is increased, and the fiber orientation degree is improved, and the molecular arrangement is more dense, and the carbon fiber intensity is increased.

Description

technical field [0001] The invention relates to the field of carbon fiber manufacturing, in particular to a method for preparing high-performance polyacrylonitrile-based carbon fibers. Background technique [0002] Polyacrylonitrile (PAN)-based carbon fiber is a kind of inorganic fiber material with a turbostratic graphite structure with a carbon content of more than 90% and a carbon content of more than 90% obtained by using PAN precursors as a precursor. A series of excellent properties such as high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, radiation resistance, electrical conductivity, heat transfer, shock absorption, noise reduction and low relative density. As a high-tech material for both military and civilian purposes, carbon fiber has been widely used in cutting-edge fields such as aerospace, national defense and military, as well as civilian industries such as advanced sporting goods and medical equipment. The developm...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F6/38D01D5/14D01D10/06C08F220/48C08F220/14C08F222/02C08F220/56
Inventor 许东张鹏耿丽李颖刘建军
Owner XIAN KANGBEN MATERIAL
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