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Device and method for producing low-dispersion coefficient carbon fibers

A discrete coefficient and carbon fiber technology, applied in the fields of fiber chemical characteristics, textiles and papermaking, etc., can solve problems such as unstable production and unresolved basic scientific problems

Active Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic carbon fiber has only achieved certain results in T300 level carbon fiber, and it cannot be produced stably
The reason for the above phenomenon is mainly that the basic scientific problems in the process of carbon fiber preparation in China have not yet been resolved.

Method used

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  • Device and method for producing low-dispersion coefficient carbon fibers

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Experimental program
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Effect test

Embodiment 1

[0020] After the polyacrylonitrile precursor is uncoiled, it is pre-treated by a saturated steam device and a drying oven. The steam pressure is 0.15MPa, the residence time is 3min, and the draft ratio is 5%. The drying oven temperature is 120°C, and the drying time is 5 minutes. Then, preoxidation is carried out by gradually increasing the temperature at 180-300°C under air atmosphere, low-temperature carbonization is carried out at 300-800°C under inert gas, and high-temperature carbonization is carried out at 900-1500°C. Finally, the carbon fiber is obtained by winding, the tensile strength of the carbon fiber is 4540MPa, and the dispersion coefficient of the tensile strength is 2.15%; the tensile modulus is 257GPa, and the dispersion coefficient of the tensile modulus is 2.21%.

Embodiment 2

[0022] After the polyacrylonitrile precursor is uncoiled, it is pretreated by a saturated steam device and a drying oven. The steam pressure is 0.2 MPa, the residence time is 3 minutes, and the draft ratio is 5%. The drying oven temperature is 120°C, and the drying time is 5 minutes. Then, preoxidation is carried out by gradually increasing the temperature at 180-300°C under air atmosphere, low-temperature carbonization is carried out at 300-800°C under inert gas, and high-temperature carbonization is carried out at 900-1500°C. Finally, the carbon fiber is obtained by winding. The tensile strength of the carbon fiber is 4670MPa, and the dispersion coefficient of the tensile strength is 2.12%; the tensile modulus is 259GPa, and the dispersion coefficient of the tensile modulus is 2.09%.

Embodiment 3

[0024] After the polyacrylonitrile precursor is uncoiled, it is pre-treated by a saturated steam device and a drying oven. The steam pressure is 0.3MPa, the residence time is 3min, and the draft ratio is 5%. The drying oven temperature is 120°C, and the drying time is 5 minutes. Then, preoxidation is carried out by gradually increasing the temperature at 180-300°C under air atmosphere, low-temperature carbonization is carried out at 300-800°C under inert gas, and high-temperature carbonization is carried out at 900-1500°C. Finally, the carbon fiber is obtained by winding, the tensile strength of the carbon fiber is 4850MPa, and the dispersion coefficient of the tensile strength is 1.98%; the tensile modulus is 264GPa, and the dispersion coefficient of the tensile modulus is 1.89%.

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Abstract

The invention relates to a device and method for producing low-dispersion coefficient carbon fibers. The device and method mainly solve the technical problem that the existing method and device produce carbon fibers with a large mechanical property dispersion coefficient and poor stability. Through use of processes such as drawing (2) in saturated steam and drying (3) after precursor fiber uncoiling (2) and before pre-oxidation (4), low temperature carbonization (5), high temperature carbonization (6), surface treatment, starching and drying (7) and rolling (8) and use of a roller linear speed of transmission systems before and after each one of processes, a fiber tension force is adjusted and controlled. Through the device and method, the polyacrylonitrile precursor has the largest orientation degree before pre-oxidation so that the fibers are more homogenized in later treatment. The device and method effectively reduce a carbon fiber mechanical parameter such as a dispersion coefficient, well solve the above problem and can be used in the field of carbon fiber industrial production.

Description

technical field [0001] The invention relates to a device and method for producing low dispersion coefficient carbon fibers. technical background [0002] Carbon fiber has a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity, heat transfer and small thermal expansion coefficient, and is widely used in sports and leisure products and high-tech It has great application prospects in the industrial field, especially in the aerospace field. The preparation of carbon fibers generally includes three major processes: polymerization spinning, pre-oxidation, and carbonization. Each process contains dozens or hundreds of process control points, and each process control point may lead to defective structures in the fibers. As a result, the performance of carbon fiber is unstable. "Research Progress of Polyacrylonitrile-based Carbon Fibers" ...

Claims

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Application Information

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IPC IPC(8): D01F9/32D01F9/22
Inventor 昌志龙张琨吴历斌吴粮华
Owner CHINA PETROLEUM & CHEM CORP
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