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Ribbon-shaped polyacrylonitrile carbon fiber and its preparation method

A technology of polyacrylonitrile carbon fiber and polyacrylonitrile, which is applied in the fields of fiber chemical characteristics, stretch spinning, textiles and papermaking, etc. It can solve the problems of large demand for large-sized carbon fibers, improve production efficiency, reduce production costs, The effect of improving production efficiency

Active Publication Date: 2020-09-11
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the demand for large-sized carbon fibers is increasing, and it is difficult to obtain large-sized carbon fibers with excellent performance using existing technologies

Method used

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  • Ribbon-shaped polyacrylonitrile carbon fiber and its preparation method
  • Ribbon-shaped polyacrylonitrile carbon fiber and its preparation method
  • Ribbon-shaped polyacrylonitrile carbon fiber and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Mix acrylonitrile, methyl acrylate, itaconic acid with the solvent dimethyl sulfoxide (DMSO), add the initiator azobisisobutyronitrile (AIBN) to carry out acrylonitrile solution copolymerization, in which the input copolymerized monomer In terms of the total mass of the polymer, put monomers and comonomers into the polymerization kettle according to the ratio of 97.2% of acrylonitrile, 1.6% of methyl acrylate and 1.2% of itaconic acid, and then add DMSO solvent to control the proportion of monomer acrylonitrile in the total amount of the polymerization system. 22% of the mass, reacted at a temperature of 65°C for 24 hours, and the resulting polymerization solution was stored at 60°C for wet spinning after de-monolysis and degassing, and the polymer spinning solution was passed through a metering pump, a candle filter, a belt Spinneret with spinneret holes, the number of spinneret holes is 22, the hole diameter is 0.05×0.4mm (W×L), the spinning solution passes through the...

Embodiment 2

[0044] According to the polymerization formula of Example 1, the materials were fed into the polymerization tank, and the same process conditions were used to carry out polymerization reaction, single removal and defoaming to obtain the spinning solution. Spinning, coagulation, primary drafting, washing, oiling, drying and densification according to Example 1, the fibers after drying and densification are drawn 2.41 times through superheated steam for a second time, and obtained polyacrylonitrile precursor through heat setting . Under the air atmosphere, the raw silk was pre-oxidized in six pre-oxidation furnaces with temperatures of 220, 230, 240, 250, 260 and 270°C, and the pre-oxidation time was 80 minutes; under nitrogen atmosphere, the temperatures were respectively 350, 450, and 800°C three-temperature zone low-temperature carbonization furnace treatment; under nitrogen atmosphere, the temperature was respectively 1100, 1600°C two-temperature zone high-temperature carbon...

Embodiment 3

[0046] According to the polymerization formula of Example 1, the materials were fed into the polymerization tank, and the same process conditions were used to carry out polymerization reaction, single removal and defoaming to obtain the spinning solution. Spinning, coagulation, primary drafting, washing, oiling, drying and densification according to Example 1, the fibers after drying and densification are drawn 2.50 times through superheated steam for a second time, and obtained polyacrylonitrile precursor through heat setting . The raw silk is subjected to pre-oxidation treatment in six pre-oxidation furnaces with temperatures of 220, 230, 240, 250, 260 and 270°C under air atmosphere, and the pre-oxidation time is 70 minutes; under nitrogen atmosphere, the temperatures are respectively 350, 450, and 800°C three-temperature zone low-temperature carbonization furnace treatment; under nitrogen atmosphere, the temperature was respectively 1100, 1600°C two-temperature zone high-te...

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Abstract

The invention discloses ribbon-shaped polyacrylonitrile carbon fiber and a preparation method thereof. The preparation method comprises steps as follows: (1), an acrylonitrile monomer, itaconic acid,methyl acrylate and a solvent are co-polymerized, and a polymer spinning solution is obtained; (2), the polymer spinning solution is subjected to jet spinning by a spinneret plate provided with ribbon-shaped spinneret holes and then subjected to coagulating draft forming in coagulating bath, ribbon-shaped polyacrylonitrile nascent fiber is obtained, and a ribbon-shaped polyacrylonitrile precursoris prepared from the ribbon-shaped polyacrylonitrile nascent fiber by primary drafting, washing, oiling drying densification, secondary drafting and heat setting; (3), the ribbon-shaped polyacrylonitrile precursor is subjected to pre-oxidation, low-temperature carbonization and high-temperature carbonization, and the ribbon-shaped polyacrylonitrile carbon fiber is obtained. Compared with traditional carbon fiber with circular cross section, the prepared ribbon-shaped polyacrylonitrile carbon fiber has advantages as follows: the long axis can reach 22.3-24.2 mu m, the minor axis is 5.1-.54 mum, the fineness can reach 0.154-0.174 tex, the tensile strength of monofilament is not lower than 5.4 GPa, and the tensile modulus can reach 294 GPa.

Description

technical field [0001] The invention belongs to the technical field of carbon materials. Specifically, the invention relates to a strip-shaped polyacrylonitrile carbon fiber and a preparation method thereof. Background technique [0002] High-performance polyacrylonitrile carbon fiber has excellent properties such as high specific strength, high specific modulus, and high temperature resistance. As a reinforcement of composite materials, it is widely used in military, aviation, aerospace, civil industry, sports and leisure and other fields. [0003] Polyacrylonitrile carbon fiber is obtained by preoxidation and carbonization of polyacrylonitrile precursor. The preoxidation process is transformed into a heat-resistant trapezoidal structure through ring formation, dehydrogenation and oxidation reactions, which can withstand high temperature carbonization process. The oxidation reaction in the pre-oxidation process can accelerate the cyclization and dehydrogenation reactions, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22C08F220/46C08F222/02C08F220/14D01D5/12
CPCC08F220/46D01D5/12D01F9/22C08F222/02C08F220/14
Inventor 李常清刘杰陈洞张顺徐樑华赵振文阮如玉曹维宇童元建王宇高爱君
Owner BEIJING UNIV OF CHEM TECH
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