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Method for manufacturing polyacrylonitrile-based carbon fiber with enganced carbon nano-tube

A technology of polyacrylonitrile-based carbon fibers and carbon nanotubes is applied in the chemical characteristics of fibers, rayon manufacturing, textiles and papermaking, etc., to achieve the effects of improving breaking strength, simple preparation process and easy control.

Inactive Publication Date: 2008-08-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the preparation of polyacrylonitrile / carbon nanotube composite fibers and composite carbon fibers by direct spinning in the literature.

Method used

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  • Method for manufacturing polyacrylonitrile-based carbon fiber with enganced carbon nano-tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 23.5g of polyacrylonitrile (PAN) powder into 100ml of N,N-dimethylacetamide (DMAc) solvent, swell at 0-15°C for 4 hours, slowly heat to 70°C in a water bath, and continue stirring for 2h, A PAN solution was obtained. The multi-walled carbon nanotube (MWNT) obtained by oxidation of 0.705g mixed acid (the mixing volume ratio of concentrated nitric acid and concentrated sulfuric acid is 1:3) is dispersed in 35ml DMAc through an ultrasonic cell pulverizer to obtain a carbon concentration of 0.0201g / ml. The nanotube suspension is then blended with the PAN solution, stirred at room temperature for 4h, filtered and defoamed, and the PAN / MWNT spinning with a mass percentage of MWNT of 3% (the mass percentage of carbon nanotubes relative to polyacrylonitrile) is obtained. stock solution.

[0027] (2) The polyacrylonitrile composite fiber with 3% MWNT mass percentage prepared by wet spinning of the above spinning stock solution, wherein the spinning temperature is 30°C, ...

Embodiment 2

[0031] (1) The method is the same as in Example 1, the multi-walled carbon nanotubes are replaced by single-walled carbon nanotubes (SWNT), and the solvent is dimethylformamide.

[0032] (2) The polyacrylonitrile composite fiber with 0.1% SWNT mass percentage prepared by wet spinning of the above spinning stock solution, wherein the spinning temperature is 30°C, the aperture of the spinneret hole is 0.08mm, and the temperature of the coagulation bath is 25°C, The coagulation bath composition is 40%DMF / H 2 O solution, the drawing speed is 5-20m / min, stretching 10 times.

[0033] (3) Same as Example 1, obtain SWNT reinforced carbon fiber.

Embodiment 3

[0035] (1) method is the same as embodiment 1, and solvent is 50% sodium thiocyanate aqueous solution.

[0036] (2) The polyacrylonitrile composite fiber with MWNT mass percentage of 20% is prepared by wet spinning of the above spinning stock solution, wherein the spinning temperature is 30°C, the aperture of the spinneret hole is 0.08mm, and the temperature of the coagulation bath is 25°C, The composition of the coagulation bath is 15% sodium thiocyanate aqueous solution, the drawing speed is 5-20 m / min, and the drawing is 6 times.

[0037] (3) Same as Example 1, obtain MWNT reinforced carbon fiber.

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Abstract

The invention relates to a method for preparing polyacrylonitrile-based carbon fiber with reinforced carbon nanometer tubes, which comprises the following steps: respectively dispersing and dissolving carbon nanometer tubes (CNT) and polyacrylonitrile (PAN) in dissolvent, obtaining PAN / CNT spinning solution through mixing the solution, obtaining PAN / CNT fiber through carrying out the wet-spinning method to the solution, then carrying out pre-oxidation and carbonization to the wet-spinning fiber to prepare the carbon fiber with reinforced carbon nanometer tubes. The mechanical property of the carbon fiber which is prepared by the method of the invention is obviously improved, and the prepared carbon fiber can be applied to the fields of reinforcing materials, conducting, electrostatic resistance, heat conducting and the like.

Description

technical field [0001] The invention belongs to the field of preparation of composite materials, in particular to a preparation method of carbon nanotube-reinforced polyacrylonitrile-based carbon fibers. Background technique [0002] Polyacrylonitrile (PAN) is a fiber made of polymer with acrylonitrile as the main chain structure unit after spinning. The carbon fiber prepared with polyacrylonitrile precursor as the precursor has the best comprehensive performance, and the output accounts for more than 90%. . Polyacrylonitrile-based carbon fiber integrates high mechanical strength, high modulus, low specific gravity, high temperature resistance, chemical resistance and excellent electrical, physical and mechanical properties. Its excellent performance and unique functions are widely used in aviation, aerospace, weapons and ships. , automobiles, machinery manufacturing, textiles, chemicals, electronics, communications, medical equipment and other industrial fields, as well as...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F1/10
Inventor 张清华董艳李静夏清明陈大俊
Owner DONGHUA UNIV
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