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Pre-oxidation method of polyacrylonitrile-based fibers and preparation method of carbon fibers

A technology of polyacrylonitrile-based carbon fiber and polyacrylonitrile-based fiber, which is applied in the field of pre-oxidation method and large tow carbon fiber preparation, and can solve the problems of easy fiber breakage, concentrated heat release, and high energy consumption

Active Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems mainly solved by the present invention is the problems of high energy consumption, concentrated heat release, easy fiber breakage and poor performance of the final product in the pre-oxidation process existing in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw polyacrylonitrile-based large tow was first heat-treated at 240°C for 20 minutes in a nitrogen atmosphere, and then heat-treated at 240°C for 10 minutes in a nitrogen atmosphere with an oxygen content of 1%. The draw ratio was 1.05, and the tow width was 20mm. The number is 48K, the fineness is 1.5dtex. Then carry out pre-oxidation under air atmosphere, pass through three temperature zones successively, the temperature is 220°C, 240°C, 280°C, the total residence time is 30min, and then carry out low-temperature carbonization under inert gas at 300~800°C, 900~ Carry out high-temperature carbonization at 1500°C, and finally obtain carbon fibers with a tensile strength of 3.3GPa and a tensile modulus of 223GPa.

Embodiment 2

[0026] The raw polyacrylonitrile-based large tow was first heat-treated at 240°C for 10 minutes in a nitrogen atmosphere, and then heat-treated at 240°C for 20 minutes in a nitrogen atmosphere with an oxygen content of 1%. The draw ratio was 1.05, and the tow width was 20mm. The number is 48K, the fineness is 1.5dtex. Then carry out pre-oxidation under air atmosphere, pass through three temperature zones successively, the temperature is 220°C, 240°C, 280°C, the total residence time is 30min, and then carry out low-temperature carbonization under inert gas at 300~800°C, 900~ Carry out high-temperature carbonization at 1500°C, and finally obtain carbon fibers with a tensile strength of 3.5GPa and a tensile modulus of 231GPa.

Embodiment 3

[0028] The raw polyacrylonitrile-based large tow was first heat-treated at 240°C for 10 minutes in a nitrogen atmosphere, and then heat-treated at 240°C for 20 minutes in a nitrogen atmosphere with an oxygen content of 2%. The draft ratio was 1.05, and the tow width was 20mm. The number is 48K, the fineness is 1.5dtex. Then carry out pre-oxidation under air atmosphere, pass through three temperature zones successively, the temperature is 220°C, 240°C, 280°C, the total residence time is 30min, and then carry out low-temperature carbonization under inert gas at 300~800°C, 900~ Carry out high-temperature carbonization at 1500°C, and finally obtain carbon fibers with a tensile strength of 3.2GPa and a tensile modulus of 225GPa.

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Abstract

The invention relates to a pre-oxidation method of polyacrylonitrile-based fibers and a preparation method of carbon fibers, and mainly solves the problems of high energy consumption, concentrated heat release, easy fiber breakage and poor final product performance in a pre-oxidation process in the prior art. According to the technical scheme, the pre-oxidation method of the polyacrylonitrile-based fibers comprises the steps that polyacrylonitrile fiber bundles are subjected to thermal stabilization treatment under the inert and low-oxygen-content atmosphere, and then pre-oxidation is conducted, the problems are well solved, and the pre-oxidation method can be used for industrial production of the polyacrylonitrile-based large-tow carbon fibers.

Description

technical field [0001] The invention relates to a method for preoxidizing polyacrylonitrile-based fibers and a method for preparing carbon fibers, in particular to a method for preoxidizing polyacrylonitrile-based large tow fibers and a method for preparing large tow carbon fibers, which can effectively reduce the preoxidation process Heat release and time, reduce energy consumption. [0002] technical background [0003] Carbon fiber refers to an inorganic polymer fiber with a carbon content of more than 92% and composed of polymeric precursors or carbon allotrope units, which is a typical high-performance fiber. It has the advantages of high specific strength, high specific modulus, high temperature resistance, corrosion resistance, creep resistance, electrical conductivity and small specific gravity, which make it widely used in automobiles, aircraft, rail transit, wind power generation, sports equipment and other fields. Carbon fibers are divided into polyacrylonitrile-b...

Claims

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Application Information

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IPC IPC(8): D01F9/22
CPCD01F9/225
Inventor 陈辉沈志刚昌志龙
Owner CHINA PETROLEUM & CHEM CORP