Polyacrylonitrile-based carbon fiber and stabilization method thereof

A polyacrylonitrile-based carbon fiber and polyacrylonitrile-based technology, which is applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve problems such as affecting the performance of carbon fiber products, reduce the skin-core effect, improve mechanical properties, and improve thermal stability. Effect

Active Publication Date: 2021-02-26
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these two methods have a more or less mitigating effect on the thermal degradation of the stabilization process, the stabilization process of the above two methods is still carried out in an air atmosphere, and excess oxygen in the air may cause chain degradation. behavior, affecting the performance of the final carbon fiber product

Method used

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  • Polyacrylonitrile-based carbon fiber and stabilization method thereof
  • Polyacrylonitrile-based carbon fiber and stabilization method thereof
  • Polyacrylonitrile-based carbon fiber and stabilization method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0046] A polyacrylonitrile-based fiber precursor, specifically an acrylonitrile-itaconic acid copolymer fiber precursor, the preparation method is as follows:

[0047] (1) Dissolve itaconic acid monomer (IA), azobisisobutyronitrile (AIBN) and acrylonitrile monomer (AN) in dimethyl sulfoxide (DMSO), the sum of the concentrations of the two monomers is 5.71mmol / mL, the molar weight of AIBN is 0.2% of the total molar weight of the two monomers, and the molar ratio of acrylonitrile to itaconic acid is 98:2. into pure water, the product is precipitated and purified; the product is washed and dried to obtain an acrylonitrile-itaconic acid copolymer with a molar percentage of acrylonitrile-based structural units of 98%;

[0048] (2) wet spinning the acrylonitrile-itaconic acid copolymer obtained in step (1) to obtain the acrylonitrile-itaconic acid copolymer fiber precursor.

preparation example 2

[0050] A polyacrylonitrile-based fiber precursor, specifically a polyacrylonitrile fiber precursor, the preparation method is as follows:

[0051] The polyacrylonitrile fiber precursor with a weight average molecular weight of 210,000 and a molecular weight distribution of 1.5 is wet-spun to obtain the polyacrylonitrile fiber precursor.

Embodiment 1

[0053] A method for stabilizing polyacrylonitrile-based carbon fibers, comprising:

[0054] (1) Low-temperature treatment: the acrylonitrile-itaconic acid copolymer fiber precursor obtained in Preparation Example 1 is placed in a tube furnace after being packed into a magnetic boat, and nitrogen is charged after vacuuming three times, and the nitrogen gas flow is 25mL / min. Keep the oxygen concentration at 0%, set the heating rate of the tube furnace at 5°C / min, heat up to 195°C and hold the temperature for 20 minutes, heat up to 205°C and hold the temperature for 20 minutes, then raise the temperature to 215°C and keep the temperature for 20 minutes, and finally raise the temperature to 220°C, the treatment time at 150-220°C is 74min;

[0055] (2) Medium temperature treatment: after low temperature treatment, keep the nitrogen gas flow at 25mL / min (oxygen concentration is 0), the heating rate is 5°C / min, heat up to 230°C and hold for 20 minutes, then raise the temperature to 2...

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Abstract

The invention provides a polyacrylonitrile-based carbon fiber and a stabilization method thereof. The stabilization method comprises the following steps: sequentially carrying out stabilization treatment at a low temperature, a medium temperature, a high temperature and an ultra-high temperature on a polyacrylonitrile-based fiber precursor to obtain a polyacrylonitrile-based stabilized fiber; wherein the oxygen concentration at the low temperature is smaller than or equal to that at the medium temperature, the oxygen concentration at the medium temperature is smaller than that at the high temperature, and the oxygen concentration at the high temperature is smaller than or equal to that at the ultra-high temperature. According to the stabilization method, thermal degradation of the polyacrylonitrile-based fiber precursor in a stabilization process is effectively reduced, the size and completeness of a graphite belt in the fiber are improved, a sheath-core effect is reduced, and a foundation is laid for preparing the high-performance carbon fiber. The polyacrylonitrile-based carbon fiber treated by the stabilization method has relatively high thermal stability and tensile strength, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of fiber preparation, and in particular relates to a polyacrylonitrile-based carbon fiber and a stabilizing method thereof. Background technique [0002] As a kind of high-performance fiber, carbon fiber has the advantages of low density, high tensile strength, high tensile modulus and good chemical resistance, and has been widely used in sports, medical, aerospace, automobile and other fields. Among them, the carbon fiber technology with polyacrylonitrile as the precursor is the most successful, with the best performance in all aspects, and has gradually become the mainstream of carbon fiber. Homopolymers or copolymers of polyacrylonitrile are the most important precursors for the manufacture of high-performance carbon fibers, accounting for nearly 90% of global carbon fiber production. However, the current strength of commercial carbon fibers is far from the theoretical value, and the precursor is easily ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22
CPCD01F9/225
Inventor 周鸿康王欣王湘麟刘玉锇
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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