Preparation method of high-strength carbon fiber

A high-strength carbon fiber and fiber technology, applied in the chemical characteristics of fibers, chemical post-processing of rayon, textiles and papermaking, etc., can solve the problems of inconvenient operation, complex equipment, low efficiency, etc., and achieve short processing time, simple operation, good treatment effect

Inactive Publication Date: 2010-02-17
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method equipment is extremely complicated, and cost is higher, and operation is inconvenient, and efficiency is low

Method used

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  • Preparation method of high-strength carbon fiber
  • Preparation method of high-strength carbon fiber
  • Preparation method of high-strength carbon fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Mix 0.05 parts by weight of carboxylated multi-armed carbon nanotubes (Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, length 10-30 μm, inner diameter 10-20 nm, outer diameter 5-10 nm) with 100 parts by weight of solvent dimethyl sulfoxide, and use Ultrasonic cell pulverizer with a power of 300w for 3 hours; add 0.05 parts by weight of polymer thickener polyacrylonitrile (polyacrylonitrile is 88,000, particle diameter is 230nm-250nm) to the mixed solution obtained, and use ultrasonic cell pulverizer to Ultrasonic at 300w for 2 hours; immerse the oxidized polyacrylonitrile preoxidized fiber in the obtained mixed solution at a solid-to-liquid ratio of 1:3 and let it stand for 1 hour to form a thickness of 200nm on the surface of the oxidized polyacrylonitrile preoxidized fiber. The coating is then carbonized at 1000 degrees Celsius to obtain high-strength carbon fibers. figure 1 It is the field emission electron micrograph of the carbon fiber after th...

Embodiment 2

[0028] Carboxylated multi-armed carbon nanotubes (Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, length 10-30 μm, inner diameter 10-20nm, outer diameter 5-10nm) 0.5 parts by weight and solvent N, N-dimethylformamide 100 weight 1.5 hours of supersonication with a power of 600w with an ultrasonic cell pulverizer; add 0.05 parts by weight of a polymer thickener polyvinyl alcohol (a degree of polymerization is 88,000, and a particle diameter of 230nm-250nm) in the resulting mixed solution, and use an ultrasonic Ultrasonic the cell pulverizer with a power of 600w for 1 hour; immerse the oxidized polyacrylonitrile preoxidized fiber into the obtained mixed solution at a solid-to-liquid ratio of 1:2 and let it stand for 2 hours to form a thickness on the preoxidized spinning fiber. 200nm coating, and then carbonized at 1000 degrees Celsius to obtain high-strength carbon fibers. figure 2 It is a field emission electron microscope image of 10,000 times the magnifi...

Embodiment 3

[0030] Mix 0.05 parts by weight of carboxylated multi-armed carbon nanotubes (Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, length 10-30 μm, inner diameter 10-20 nm, outer diameter 5-10 nm) with 100 parts by weight of solvent water, and use an ultrasonic cell pulverizer Ultrasonic with a power of 500w for 2 hours; add 5 parts by weight of a polymer thickener polyvinyl alcohol (a degree of polymerization of 88,000 and a particle size of 230nm-250nm) to the resulting mixed solution, and use an ultrasonic cell pulverizer to sonicate for 1.5 hours with a power of 600w ; The mixed solution obtained is sprayed onto the oxidized polyacrylonitrile pre-oxidized fiber surface under the conditions of spray voltage 80kv, spray distance 25cm and spray gun rotation speed 2800r / min by electrostatic spraying to form a coating with a thickness of 300nm, and then through 1000 Celsius carbonization to obtain high-strength carbon fibers. image 3 It is the field emission el...

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Abstract

The invention provides a preparation method of a high-strength carbon fiber, which is characterized by comprising the following specific steps: firstly, mixing 0.01-2 portions by weight of carbon nanotubes and 100 portions by weight of solvent and carrying out ultrasound treatment for 1.5 to 3 hours at the power of 300w to 600w by an ultrasonic cell disruptor; secondly, adding 0.01-5 portions byweight of polymeric plasticizer in the obtained mixing solution and carrying out ultrasound treatment for 1 to 2 hours at the power of 300w to 600w by an ultrasonic cell disruptor; and thirdly: forming a coating with the thickness of 100 nm to 300 nm on a pre-oxidized fiber for spinning by using the mixed solution in the second step and obtaining the high-strength carbon fiber by carbonization. The preparation method can ensure that the tensile strength of the carbon fiber is improved by 15-30 percent and the toughness of the carbon fiber is improved by 30 percent.

Description

technical field [0001] The invention relates to a method for preparing high-strength carbon fibers, which belongs to the technical field of carbon fiber processing. Background technique [0002] During the processing and production of carbon fiber (or graphite fiber), especially the carbon fiber processed and produced with polyacrylonitrile precursor as raw material, due to the defects of the precursor itself and the uniformity of the processing process, the surface holes are formed, and these holes cause fiber The stress concentration phenomenon during stress is also the main factor for single-filament fracture. The repair of these surface holes has always been a matter of great concern in the field of carbon fiber production, but so far there is no good way, so at present, only the monofilament with existing holes can be sacrificed, resulting in a significant decline in the overall mechanical properties of carbon fiber. [0003] Chinese patent 02121070.5 uses focused elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F11/16D01F11/12D01F11/14D01F9/12D01F9/22
Inventor 余木火荣怀苹韩克清王兆华田银彩张辉蔡金琳
Owner DONGHUA UNIV
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