Method for preparing CNT (carbon nano tube)-polyacrylonitrile fibre by melting spinning

A polyacrylonitrile fiber and carbon nanotube technology, which is applied in the directions of melt spinning, stretch spinning, fiber chemical characteristics, etc., can solve the problems of corrosive chemical solvents, lack of research, and high production costs, and achieves a high production cost. The method is simple, the strength of the raw silk is improved, and the cost is low.

Inactive Publication Date: 2012-01-04
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the research so far has focused on the wet spinning, dry spinning and dry-wet spinning of composite fibers, and the research on the melt spinning method of PAN / CNT composite fibers is still vacant.
[0005] The patent application number CN101250770A discloses the preparation of carbon nanotube polyacrylonitrile composite fibers by wet spinning, and the spinning stock solution prepares carbon nanotube polyacrylonitrile composite fibers through wet or dry-wet spinning processes, and then passes through DMF or DMSO coagulation bath, washing, drawing, and heat setting to obtain composite fibers, but this method uses a large amount of toxic or corrosive chemical solvents, and the production cost is high

Method used

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  • Method for preparing CNT (carbon nano tube)-polyacrylonitrile fibre by melting spinning
  • Method for preparing CNT (carbon nano tube)-polyacrylonitrile fibre by melting spinning
  • Method for preparing CNT (carbon nano tube)-polyacrylonitrile fibre by melting spinning

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Experimental program
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Effect test

Embodiment 1

[0027] First, single-walled carbon nanotubes and ionic liquid [BMIM]Cl were mixed evenly in an ultrasonic cell pulverizer with a mass ratio of 1:10, and then mixed with polyacrylonitrile powder (the mass ratio of polyacrylonitrile powder to carbon nanotubes was 10: 2) Mix evenly in a high-speed mixer, and put the mixture into the hopper of a twin-screw spinning machine for melt spinning. The melt spinning temperature is 180°C, the aspect ratio of the spinneret is 3:1, the hole diameter is 0.3mm, and the winding speed is 25m / min; then the as-spun yarn is subjected to primary dry heat stretching and secondary dry heat stretching; After stretching, the plasticizer was removed in acetone solvent at 40°C; finally, PAN / CNT composite fibers were obtained by heat setting. The PAN fiber strength is 3.5cN / dtex, and the elongation at break is 19.0%. Figure 1(a) and Figure 1(b) are SEM cross-sectional views of PAN / CNT composite fibers with different magnifications when the mass ratio of ...

Embodiment 2

[0029] First, single-walled carbon nanotubes and ionic liquid [BMIM]BF 4 Disperse the carbon nanotubes uniformly in an ultrasonic cell pulverizer with a mass ratio of 1:10, and then mix the above homogeneous solution with polyacrylonitrile powder (the mass ratio of polyacrylonitrile powder to carbon nanotubes is 8:2) in a high-speed mixer Mix evenly, and then transfer the above-mentioned homogeneous mixture to a twin-screw spinning machine for melt spinning. The melt spinning temperature is 190°C, the aspect ratio of the spinneret is 5:1, the aperture is 0.3mm, and the winding speed is 150m / min, and the as-spun silk is drawn through the secondary heat pipe; Removal of plasticizer in solvent; heat setting to obtain PAN / CNT composite fiber. The PAN fiber strength is 3.8cN / dtex, and the elongation at break is 17.0%. Figure 2(a) and Figure 2(b) are SEM cross-sectional views of PAN / CNT composite fibers with different magnifications when the mass ratio of PAN / CNT is 8:2.

Embodiment 3

[0031] First, multi-walled carbon nanotubes and ionic liquid [BMIM]BF 4 Disperse the carbon nanotubes uniformly in an ultrasonic cell pulverizer with a mass ratio of 1:50, then mix the above homogeneous solution with polyacrylonitrile powder (the mass ratio of polyacrylonitrile powder to carbon nanotubes is 6:2) in a high-speed mixer Mix evenly, and then transfer the above-mentioned homogeneous mixture to a twin-screw spinning machine for melt spinning. The melt spinning temperature is 195°C, the aspect ratio of the spinneret is 3:1, the hole diameter is 0.5mm, and the winding speed is 100m / min. Removal of plasticizer in acetone solvent; heat setting to obtain PAN / CNT composite fiber. The PAN fiber strength is 4.8cN / dtex, and the elongation at break is 15.0%. Figure 3(a) and Figure 3(b) are SEM cross-sectional views of PAN / CNT composite fibers with different magnifications when the mass ratio of PAN / CNT is 6:2.

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Abstract

The invention relates to a method for preparing CNT (carbon nano tube)-polyacrylonitrile fibre by melting spinning. The method comprises the following steps of: (1) dispersing CNT in ion liquid, adding polyacrylonitrile and mixing uniformly to obtain a mixed solution, wherein the mass ratio of CNT to polyacrylonitrile is 4:1-1:10, the ratio of the total mass of CNT and polyacrylonitrile to the mass of the ion liquid is 1:1-1:100; (2) processing the mixed solution by using a melting spinning method to obtain CNT-polyacrylonitrile as-spun fibre, stretching and extracting the as-spun fibre, and then performing heat setting and winding to finally obtain CNT-polyacrylonitrile composite fibre. The method provided by the invention has the advantages of low cost, reduction in environmental pollution and is suitable for industrial production; and the prepared fibre can be subjected to high stretching and has excellent mechanical property, moreover the skin-core structure difference of sections of fibre is small.

Description

technical field [0001] The invention belongs to the field of preparation of carbon nanotube polyacrylonitrile fibers, in particular to a method for preparing carbon nanotube polyacrylonitrile fibers by melt spinning. Background technique [0002] Polyacrylonitrile (PAN) fiber has good heat resistance, light resistance and weather resistance, and is widely used in clothing and industrial fields. It is one of the synthetic fibers that realized industrial production earlier. As the precursor of high-performance carbon fiber, the production and modification of polyacrylonitrile precursor has also received great attention at home and abroad. [0003] One of the main properties of polyacrylonitrile is its high melting point (317°C), which decomposes before melting during heating, so solution spinning can only be used to produce polyacrylonitrile fibers and their composite fibers. Industrialized wet spinning and dry spinning all use a large amount of toxic or corrosive chemical so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/08D01F8/18D01D5/08D01D5/12
Inventor 余木火荣怀苹韩克清田银彩王丹覃辉林
Owner DONGHUA UNIV
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