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Preparation method of polyacrylonitrile-based carbon fiber

A polyacrylonitrile-based carbon fiber, polyacrylonitrile technology, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of carbon fiber carbonization yield and mechanical properties decline, defects affecting carbon fiber performance, excessive molecular chain breakage and other problems. Improve the oiling rate and oiling uniformity, reduce the amount of coke discharge and the residue of silica, and prolong the life.

Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the thermal stabilization temperature is too low or the time is too short, sufficient heat-resistant structure cannot be formed in the polyacrylonitrile fiber, which will cause excessive molecular chain breakage in the subsequent high-temperature treatment, thereby producing defects that affect the performance of the final carbon fiber; if thermal stabilization If the temperature is too high or the time is too long, too much oxygen-containing structure may be formed in the fiber, and in the subsequent high-temperature heat treatment, CO or CO 2 The form escapes, takes away the carbon in the skeleton, and leaves many holes, which will also cause structural defects inside the fiber, and seriously reduce the carbonization yield and mechanical properties of the final carbon fiber

Method used

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  • Preparation method of polyacrylonitrile-based carbon fiber

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Comparison scheme
Effect test

Embodiment 1

[0027] The copolymer composition of the precursor is 95.5% acrylonitrile, 3.5% methyl acrylate, and 1% itaconic acid. After washing, the polyacrylonitrile raw silk enters the first oiling and extrusion rollers, and then enters the first drying and densification at a temperature of 70°C for 20s; After that, the moisture content of the raw silk is controlled to 5% by adjusting the pressure between the extrusion roller and the oiling and bathing roller, and then the second oiling is carried out, and the polyacrylonitrile raw silk leaving the second oiling is extruded again. , enter the second drying and densification, the temperature is 100 ℃, the time is 20s; finally, after steam drawing and heat setting, the steam pressure of steam drawing is 3 kg, and the drafting ratio is 2.5; the steam pressure of heat setting is 1 kg, and the drawing The draw ratio was 0.96, and a polyacrylonitrile precursor was obtained. The polyacrylonitrile fiber was thermally stabilized in the range of...

Embodiment 2

[0029] The copolymer composition of the precursor is 96.0% acrylonitrile, 3.5% methyl acrylate, and 0.5% acrylamide. After washing, the polyacrylonitrile raw silk enters the first oiling and squeezing rollers, and then enters the first drying and densification at a temperature of 100 °C and a time of 60s; After that, the moisture content of the raw silk is controlled to 10% by adjusting the pressure between the extrusion roller and the oiling and bathing roller, and then the second oiling is carried out, and the polyacrylonitrile raw silk leaving the second oiling is extruded again. , enter the second drying and densification, the temperature is 140 ℃, the time is 60s; finally, after steam drawing and heat setting, the steam pressure of steam drawing is 2.5 kg, the drafting ratio is 2.2; the steam pressure of heat setting is 1.2 kg, the drawing The draw ratio was 0.95, and a polyacrylonitrile precursor was obtained. The polyacrylonitrile precursor was thermally stabilized in ...

Embodiment 3

[0031]The copolymer composition of the precursor is 97.0% acrylonitrile and 3.0% acrylamide respectively. After washing, the polyacrylonitrile raw silk enters the first oiling and squeezing rollers, and then enters the first drying and densification at a temperature of 100 °C and a time of 60s; After that, the moisture content of the raw silk is controlled to 20% by adjusting the pressure between the extrusion roller and the oiling and bathing roller, and then the second oiling is carried out, and the polyacrylonitrile raw silk leaving the second oiling is extruded again. , enter the second drying and densification, the temperature is 140 ℃, the time is 60s; finally, after steam drawing and heat setting, the steam pressure of steam drawing is 3.5 kg, and the drafting ratio is 2.7; The draw ratio was 0.97, and a polyacrylonitrile precursor was obtained. Through 5 air atmosphere heating furnaces, the polyacrylonitrile raw silk is thermally stabilized in the range of 180 ~ 280 °...

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Abstract

The invention relates to a preparation method of polyacrylonitrile-based carbon fiber, which mainly solves the problems of large coke discharge and large amount of silicon dioxide in the low-carbon grate existing in the prior art. The present invention adopts a preparation method of polyacrylonitrile-based carbon fiber, which includes at least two steps of oiling and drying and densification; wherein, the polyacrylonitrile precursor after the first oiling and drying and densification is soaked in a water bath, The technical scheme of controlling the moisture content of the raw silk to 5% to 20%, and then carrying out the second oiling and drying and densification, can solve the problem well and can be used in the production of high-performance carbon fibers.

Description

technical field [0001] The invention relates to a preparation method of polyacrylonitrile-based carbon fiber, and belongs to the technical field of polyacrylonitrile-based carbon fiber preparation. Background technique [0002] Since the 1950s, developed countries have urgently needed new structural materials and corrosion-resistant materials in order to develop large-scale rockets and artificial satellites and comprehensively improve the performance of aircraft, so that carbon fibers reappeared on the stage of new materials, and gradually formed PAN-based carbon fibers. , three raw material systems of viscose-based carbon fiber and pitch-based carbon fiber. Because the production process of PAN-based carbon fiber precursor is simpler than other methods and the mechanical properties of the product are good, it has been rapidly developed and has become the mainstream of the current production of carbon fiber precursor. [0003] Oiling is a key step in the preparation process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22
CPCD01F9/22
Inventor 沈志刚王贺团缪金根李磊
Owner CHINA PETROLEUM & CHEM CORP
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