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High strength polyacrylonitrile-base carbon fibers having structured surface grooves, and preparation method thereof

A polyacrylonitrile-based carbon fiber, high-strength technology, applied in the direction of fiber chemical characteristics, wet spinning, stretch spinning, etc., can solve the problems of improvement, disordered fiber surface grooves, and high preparation cost, and achieves easy polymerization control, High tensile strength, performance improvement effect

Active Publication Date: 2012-10-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN102102234A increases the hydrophilicity of the polymer resin by adding highly hydrophilic organic sulfonic acid substances in the polymerization process, which has the characteristics of low cost, good hydrophilicity, and easy control of the reaction, but this method will affect the strength of the final carbon fiber performance
Chinese patent CN101148489A discloses a highly hydrophilic polyacrylonitrile spinning stock solution containing vinylimidazolium salt structural units, but vinylimidazolium salt is an ionic liquid, and the preparation cost is relatively high, so it is not suitable for large-scale industrial production
The groove structure on the surface of carbon fiber is conducive to improving the bonding force with the resin through anchoring when preparing composite materials, but generally speaking, the groove on the surface of carbon fiber will become a stress concentration point, which is not conducive to the improvement of carbon fiber strength performance
Because it is difficult to effectively adjust and control the coagulation double diffusion when wet spinning with conventional organic solvents, the grooves on the fiber surface are usually disordered, and at the same time, the fiber radial direction is not uniform.

Method used

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  • High strength polyacrylonitrile-base carbon fibers having structured surface grooves, and preparation method thereof
  • High strength polyacrylonitrile-base carbon fibers having structured surface grooves, and preparation method thereof
  • High strength polyacrylonitrile-base carbon fibers having structured surface grooves, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Dimethyl sulfoxide solvent modification

[0041] Ammonia solution with a mass concentration of 35% and dimethyl sulfoxide were stirred in the kettle for 30 minutes at a ratio of 0.1:100 (volume ratio), so that they were thoroughly mixed to obtain a modified dimethyl sulfoxide solvent for use in acrylonitrile Coagulation bath configuration for polymerization and coagulation molding;

[0042] (2) Preparation of spinning dope

[0043] Acrylonitrile, itaconic acid, and methyl acrylate were blended and added to the polymerization reactor at a molar ratio of 98.5:0.5:1, and the modified dimethyl sulfoxide solvent was used as the solvent. The polymerization reaction temperature was controlled at 65°C, and the reaction time was 22 hours, an acrylonitrile copolymer with a polymer molecular weight of 150,000 was obtained. The obtained polymer solution has an acrylonitrile copolymer content of 21%;

[0044] (3) Solidification and molding of spinning dope

[0045] A spinner...

Embodiment 2

[0062] (1) Dimethyl sulfoxide solvent modification

[0063] Ammonia solution with a mass concentration of 35% and dimethyl sulfoxide were stirred in the kettle for 30 minutes at a ratio of 0.3:100 (volume ratio), so that they were fully mixed and uniform to obtain a modified dimethyl sulfoxide solvent;

[0064] (2)~(10) are the same as embodiment 1

[0065] The performance of the carbon fiber produced: cross section: circular, diameter: 6.8μm, surface morphology: regular groove structure, density: 1.80g / cm 3 , Tensile strength: 5.28GPa, tensile modulus: 254GPa.

Embodiment 3

[0067] (1) with embodiment 1

[0068] (2) Preparation of spinning dope

[0069] Acrylonitrile, itaconic acid, and methyl acrylate were blended and added to the polymerization reactor at a molar ratio of 98.5:0.5:1, and unmodified dimethyl sulfoxide was used as a solvent. The polymerization reaction temperature was controlled at 65°C, and the reaction time was 22 hours, an acrylonitrile copolymer with a polymer molecular weight of 150,000 was obtained. The obtained polymer solution has an acrylonitrile copolymer content of 21%;

[0070] (3)~(10) are the same as embodiment 1

[0071] The performance of the carbon fiber produced: cross section: circular, diameter: 7.0μm, surface morphology: regular groove structure, density: 1.78g / cm 3 , Tensile strength: 5.15GPa, tensile modulus: 251GPa.

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Abstract

The present invention relates to high strength carbon fibers having structured surface grooves, and a preparation method thereof. According to the present invention, a wet spinning technology is adopted, and a solvent adopted by polymerization and solidification molding is modified, such that the solvent and the modifying agent form a complex structure so as to improve solidification double-diffusion in the wet spinning solidification molding process to prepare a polyacrylonitrile precursor having a axial structured surface groove structure and a uniform and dense radial structure; and then pre-oxidation structure control is adopted in a pre-oxidation process to prepare the high strength polyacrylonitrile-base carbon fibers having the structured surface groove structure. The carbon fibers of the present invention have high tensile strength and high modulus, and are easily compounded with other materials so as to improve performances of the composite material.

Description

technical field [0001] The invention relates to a high-strength polyacrylonitrile-based carbon fiber with regular surface grooves and a preparation method thereof, belonging to the field of carbon material preparation. Background technique [0002] Carbon fiber has the characteristics of high specific strength, high specific modulus, high temperature resistance, corrosion resistance, and good electrical and thermal conductivity, so it is widely used in aerospace, transportation, building energy, sports and leisure and other fields. The main manufacturers of polyacrylonitrile-based carbon fiber include Toray Corporation of Japan and Hexcel Corporation of the United States. Polyacrylonitrile-based carbon fibers are mainly divided into four categories according to their properties, namely, high-strength carbon fibers with a strength of 3.5-4.9GPa and a modulus of about 230GPa; 2.74GPa, high-model carbon fiber with a modulus of 392GPa and high-strength high-model carbon fiber w...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F6/38C08F220/46C08F222/02C08F220/14C08F2/06D01D5/06D01D5/12
Inventor 徐樑华童元建李常清曹维宇赵振文
Owner BEIJING UNIV OF CHEM TECH
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