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Preparation method of polyacrylonitrile-based carbon core

A polyacrylonitrile-based, carbon-core technology, applied in textiles, papermaking, fiber chemical characteristics, etc., can solve the problems of increasing the diameter of PAN-based carbon core fibers, SiC fiber diameters are too large, and cannot be continuously produced, etc., to achieve electrical conductivity Controllable, high strength, diameter controllable effect

Inactive Publication Date: 2007-02-07
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve the same resistance as the mesophase pitch-based carbon core, it is necessary to increase the diameter of the PAN-based carbon core fiber, resulting in an excessively large diameter of the final SiC fiber, which cannot be wound during the production process and cannot be continuously produced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018]Disperse 10 parts of graphite whiskers (average diameter 0.5 μm, average length 6 μm) in 90 parts of dimethyl sulfoxide (DMSO) with strong electric mechanical stirring (200 r / min) for 120 min to form 10% graphite whiskers solution. Dissolve 90 parts of PAN (PAN has a molecular weight of about 240,000, is a terpolymer, and has a composition of acrylonitrile: methyl acrylate: acrylic acid = 93:6:1) in 810 parts of DMSO to obtain a 10% PAN solution. Add the PAN solution to the graphite whisker solution successively in 5 times, and disperse with strong electric stirring (1500r / min) for 60min successively, and the adding amount of each time is 20 parts, 60 parts, 120 parts, 240 parts and 370 parts respectively. Parts, finally obtain 10% PAN / graphite whisker spinning solution. Pour the spinning solution into the spinning tank and raise the temperature to 60°C, after static defoaming and filtration, wet spinning is carried out. The spinning conditions were that the supply rat...

Embodiment 2

[0020] 15 parts of the dry carbon nanotube / PAN composite polymer obtained by in-situ polymerization were dissolved in 85 parts of DMF to prepare a spinning solution with a concentration of 15%. The composition of the composite polymer is 1 part of carbon nanotubes (average diameter 0.015 μm, average length 10 μm), 93 parts of acrylonitrile, 5 parts of ethyl acrylate and 1 part of itaconic acid. The temperature of the spinning solution is raised to 60°C, and the dry-wet spinning is carried out after standing still for defoaming and filtering. The spinning condition is that the pump supply rate is 0.15ml / min, the spinneret aperture is 0.12mm, the distance between the spinneret and the liquid surface is 5mm, and the fiber forming conditions are as in Example 1, but the second-bath draw ratio is 1.5, and the third-bath draw ratio is 1.5. The ratio is 2, the drawing ratio of the four baths is 1.05, the drawing ratio of the hot air drying and densification zone is 1.05, the winding ...

Embodiment 3

[0022] 30 parts of dry PAN / graphite whisker composite polymer obtained by in-situ polymerization were dissolved with 70 parts of DMF to prepare a spinning solution with a concentration of 30%. The composition of the composite polymer was 5 parts graphite whiskers (average diameter 0.5 μm, average length 6 μm), 90 parts acrylonitrile, 4 parts ethyl acrylate and 1 part acrylic acid. The temperature of the spinning solution is raised to 60°C, and the dry-wet spinning is carried out after standing still for defoaming and filtering. The conditions of spinning, pre-oxidation and carbonization are the same as in Example 2, and graphitization treatment is carried out in an argon atmosphere at 2300° C. for 5 s. The obtained carbon core has a diameter of about 24±2 μm, a strength of 1050-1150 MPa, a length of more than 1500 m, and a resistivity of 4.8-5.5 μΩ·m.

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Abstract

The invention relates to a method for producing polyacrylonitrile-based carbon core, with high conductivity, via chemical deposition method, wherein the invention has high strength, high conductivity and controllable diameter; and the method is CVD method. The production comprises: preparing the PAN spinning solution with one-dimension high-conductivity carbon; preparing original fiber with spinning solution; crosslinking in oxygen gas, to prepare the pre-oxidized fiber; carbonizing in inertia gas, to prepare the carbonized fiber; graphitizing in inertia gas, to prepare the graphitized carbon corn. The invention can improve the conductivity of PAN-based carbon fiber; and since the anti-tension strength and flexible modulus of one-dimension high-conductivity carbon are higher than PAN-based carbon fiber, it can improve the strength of PAN-based carbon fiber to improve the treatment property of CVD method.

Description

technical field [0001] The invention relates to a polyacrylonitrile-based carbon core (polyacrylonitrile, referred to as PAN), in particular to a high-conductivity polyacrylonitrile-based carbon core for continuous fiber preparation by chemical vapor deposition (Chemical Vapor Deposition, referred to as CVD) Methods. This carbon core is particularly suitable for use as a core material of silicon carbide (silicon carbide, SiC for short) fiber by CVD method. Background technique [0002] The SiC fiber prepared by the CVD method is to use a conductive continuous monofilament as the core material (or called a deposition carrier), so that the core material moves at a uniform speed in a tubular reactor, and a voltage is applied to both ends for resistance heating (or radio frequency heating), and the core The material is heated to a certain temperature, and at the same time the vaporized silane (such as CH 3 SiCl 3 、CH 3 HSiCl 2 etc.) is mixed with hydrogen and introduced int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22
Inventor 陈立富周花董炎明张立同张颖兰琳
Owner XIAMEN UNIV
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