Method for preparing high-performance asphalt-based carbon fiber through rapid pre-oxidation

A pitch-based carbon fiber and pre-oxidation technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, can solve the problems of increasing carbon fiber production time, long homogeneous pre-oxidation cycle, and low oxygen diffusion rate, and achieves accelerated pre-oxidation time, to achieve environmental protection, to reduce the effect of reaction temperature

Pending Publication Date: 2022-07-26
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the liquid-phase method, the gas-phase method has the advantages of no excess waste liquid, easy access to gas, and less pollution; however, the existing gas-phase pre-oxidation process has a low oxygen diffusion rate and a long homogeneous pre-oxidation cycle, which seriously Increased carbon fiber production time, increased production costs, and reduced production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing high-performance pitch-based carbon fibers by rapid pre-oxidation is characterized in that: comprising the following steps:

[0021] S001. The pitch-based carbon fiber precursors obtained after refining and spinning the pitch with petroleum pitch as a raw material are placed in a high temperature and high pressure resistant reaction chamber, and then the reaction chamber is filled with mixed gas at a gas flow rate of 1 L / min , the mixed gas includes nitrogen, oxygen and nitric oxide, and the volume percentages are 65%: 24%: 11% respectively, until the air pressure in the reaction chamber is 0.5MPa, and the pressure in the reaction chamber is kept constant by the back pressure valve;

[0022] S002, the temperature inside the reaction chamber is heated in two stages by the heating device: in the atmosphere of the mixed gas, firstly, the temperature in the reaction chamber is rapidly raised from room temperature to 180°C (that is, from room temperatur...

Embodiment 2

[0027] A method for preparing high-performance pitch-based carbon fibers by rapid pre-oxidation is characterized in that: comprising the following steps:

[0028] S001. The pitch-based carbon fiber precursors obtained after refining and spinning the pitch with petroleum pitch as the raw material are placed in a high temperature and high pressure resistant reaction chamber, and then the reaction chamber is filled with mixed gas at a gas flow rate of 3 L / min , the mixed gas includes nitrogen, oxygen and nitric oxide, and the volume percentages are 68%: 22%: 10% respectively, until the air pressure in the reaction chamber is 1MPa, and the pressure in the reaction chamber is kept constant through the back pressure valve;

[0029] S002, the temperature inside the reaction chamber is heated in two stages by the heating device: in the atmosphere of the mixed gas, firstly, the temperature in the reaction chamber is rapidly raised from room temperature to 180°C (that is, from room tempe...

Embodiment 3

[0034] A method for preparing high-performance pitch-based carbon fibers by rapid pre-oxidation is characterized in that: comprising the following steps:

[0035] S001. The pitch-based carbon fiber precursors obtained after refining and spinning the pitch with petroleum pitch as the raw material are placed in a high temperature and high pressure resistant reaction chamber, and then the reaction chamber is filled with mixed gas at a gas flow rate of 7L / min , the mixed gas includes nitrogen, oxygen and nitric oxide, and its volume percentages are 72%: 19%: 9% respectively, until the air pressure in the reaction chamber is 3MPa, and the pressure in the reaction chamber is kept constant through the back pressure valve;

[0036]S002, the temperature inside the reaction chamber is heated in two stages by the heating device: in the atmosphere of the mixed gas, firstly, the temperature in the reaction chamber is rapidly raised from room temperature to 180°C (that is, from room temperat...

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Abstract

The invention provides a method for preparing high-performance asphalt-based carbon fiber through rapid pre-oxidation, which comprises the following steps: (1) putting an asphalt-based carbon fiber precursor into a reaction cavity, and introducing mixed gas into the reaction cavity to achieve the purpose of pressurization and keep the pressure constant; (2) carrying out two-stage heating on the interior of the reaction cavity through a heating device to obtain pre-oxidized asphalt-based carbon fibers; and (3) vacuumizing the reaction cavity, introducing inert gas to ensure normal pressure, and then carbonizing and graphitizing the pre-oxidized asphalt-based carbon fiber. According to the method, the diffusion rate of oxygen in the asphalt fiber is obviously improved in a pressurization mode, so that rapid homogeneous pre-oxidation of the asphalt fiber is realized, the pre-oxidation period is obviously shortened, meanwhile, the material performance is improved, the material defects are reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of pitch fibers, in particular to a method for preparing high-performance pitch-based carbon fibers by rapid preoxidation. Background technique [0002] Pitch-based carbon fiber is a kind of special fiber with carbon content greater than 92%, which is obtained by refining, spinning, pre-oxidizing, carbonizing or graphitizing the pitch with petroleum pitch or coal pitch as raw material. Pitch-based carbon fibers have excellent properties such as high specific strength, high specific modulus, electrical conductivity, stable chemical properties, and small thermal expansion coefficient, and are widely used in industrial manufacturing, biomedicine, aerospace, and national defense. However, the high-performance pitch-based carbon fibers in the prior art are expensive and expensive to prepare, and cannot be widely used in large quantities. [0003] The oxidative stabilization treatment of fibers ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/145D01F9/155D01F9/15
CPCD01F9/145D01F9/155D01F9/15
Inventor 李轩科邓卓朱辉李保六
Owner WUHAN UNIV OF SCI & TECH
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