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Method for preparing high-strength carbon fibers

A carbon fiber, high-strength technology, applied in the field of high-strength carbon fiber preparation, can solve problems such as tensile strength not reaching T300 level, unfavorable industrial production, complex equipment, etc. Equipment simple effect

Inactive Publication Date: 2009-10-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using NiSO 4 The method of modifying the polyacrylonitrile precursor (Acta Polymer Sinica, 2001, No. 5) can increase the tensile strength of carbon fiber from 2.5GPa to 3.2GPa, but its tensile strength still cannot reach the T300 level , which limits its application in general structural composites
Wang Qiang, Zhu Bo, etc. adopted H 2 SO 4 The method of treating pre-oxidized fibers with mixed acid of HCl (Macromolecular Materials and Engineering, 2006, No. 4), the tensile strength of carbon fibers is increased from 2.76GPa to 3.21GPa, but this method uses strong acid, And the equipment is complicated, which is not conducive to industrialized production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A. Chemical modification: at 80°C, immerse the polyacrylonitrile copolymer fiber in a sulfonamide solution with a concentration of 5% by mass for 3 minutes, and then wash it with water;

[0019] B. Physical modification: the chemically modified polyacrylonitrile copolymer fiber is pretreated for 5 minutes at 180°C in air medium, under the drafting of +10% elongation;

[0020] C. Pre-oxidation: place the physically modified polyacrylonitrile copolymer fiber in a pre-oxidation furnace at 210-280°C in an air medium, keep the fiber at a fixed length, and treat it for 60 minutes;

[0021] D. Carbonization: The pre-oxidized polyacrylonitrile copolymer fibers are subjected to low-temperature carbonization and high-temperature carbonization under the protection of an inert atmosphere. % elongation under drafting treatment for 1 minute; high-temperature carbonization temperature is 1320 ° C, and the fibers are processed under -2% shrinkage for 1 minute to obtain high-strength ca...

Embodiment 2

[0023] A, chemical modification: with the A step of embodiment 1;

[0024] B. Physical modification: the chemically modified polyacrylonitrile copolymer fiber is pretreated for 10 minutes at 140°C in an air medium, under the drafting of +5% elongation;

[0025] C, preoxidation: with the step C of embodiment 1;

[0026] D, carbonization: with the step D of embodiment 1;

Embodiment 3

[0028] A, chemical modification: with the A step of embodiment 1;

[0029] B. Physical modification: the chemically modified polyacrylonitrile copolymer fiber is pretreated for 5 minutes in an air medium at 200 °C, under the drafting of +3% elongation;

[0030] C, preoxidation: with the step C of embodiment 1;

[0031] D, carbonization: with the step D of embodiment 1;

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Abstract

The invention discloses a method for preparing high-strength carbon fibers, and belongs to the filed of new material preparation. The invention aims to provide the method for preparing the high-strength carbon fibers. The method prepares the high-strength carbon fibers from polyacrylonitrile precursor fibers through sulfanilamide solution chemical modification, physical modification, preoxidation, low temperature carbonization and high temperature carbonization in turn. The method provided by the invention has simple and convenient operation and low cost, and the prepared carbon fibers have high tensile strength.

Description

technical field [0001] The invention belongs to the field of new material preparation, and in particular relates to a preparation method of high-strength carbon fiber. Background technique [0002] The development of carbon fiber originated in the 1950s. After more than 50 years of development, its application fields have become more and more extensive. With the development of science and technology, the requirements for carbon fiber performance are getting higher and higher. According to theoretical calculation, the tensile strength of carbon fiber should be 182.8GPa, but in fact, the highest tensile strength of carbon fiber can reach about 9GPa. It can be seen that the actual tensile strength of carbon fiber is much lower than the theoretically calculated tensile strength, because the structure of the fiber does not reach the assumed level of integrity, that is, there are structural defects. [0003] At present, the tensile strength of T-300 carbon fiber, which accounts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22
Inventor 刘杰刘永华马兆昆梁节英
Owner BEIJING UNIV OF CHEM TECH
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