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Efficient preparation method of polyacrylonitrile-based carbon fibers

A polyacrylonitrile-based carbon fiber and polyacrylonitrile spinning technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, can solve the problems of increasing process complexity and increasing spinning costs, and achieves reduced production time and reduced production costs , The effect of simple preparation method

Active Publication Date: 2014-06-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this increases the complexity of the process and increases the cost of spinning, so it is particularly important to optimize the raw silk preparation process and control the drafting conditions in the spinning process while ensuring the mechanical properties of the fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The temperature of the coagulation bath is 45°C, and the coagulation bath is an aqueous solution of dimethyl sulfoxide with a mass concentration of 65%; 4.0 times of drawing is carried out at a temperature of 95°C; the washing temperature is 60°C-90°C; hot roller drying is carried out at 110°C, After heat setting, the PAN precursor is obtained.

[0021] Pre-oxidation adopts six-temperature gradient temperature rise, the temperature is raised from 200°C to 265°C, and the residence time in each temperature zone is about 15 minutes to control the appropriate tension; low-temperature carbonization adopts three-stage gradient temperature rise, and the temperatures are 350°C, 450°C, 680°C, high-temperature carbonization adopts two-stage gradient heating, and the temperature range is controlled at 1200°C-1400°C. The tensile strength of 1K carbon fiber is 3.51GPa.

Embodiment 2

[0023] The temperature of the coagulation bath is 45°C, and the coagulation bath is an aqueous solution of dimethyl sulfoxide with a concentration of 65%; 5.0 times of drawing is carried out at a temperature of 98°C; the washing temperature is 60°C-90°C; After shaping, the PAN precursor is obtained.

[0024] Pre-oxidation adopts six temperature zone gradient temperature rise, the temperature is raised from 200°C to 265°C, and the residence time in each temperature zone is about 15 minutes to control the appropriate tension; low temperature carbonization adopts three-stage gradient temperature rise, the temperatures are 350°C, 450°C, 680°C, high-temperature carbonization adopts two-stage gradient heating, and the temperature range is controlled at 1200°C-1400°C. The tensile strength of 1K carbon fiber is 3.56GPa.

Embodiment 3

[0026] The temperature of the coagulation bath is 45°C, and the coagulation bath is an aqueous solution of dimethyl sulfoxide with a concentration of 65%; 5.5 times of drawing is carried out at a temperature of 100°C; the washing temperature is 60°C-90°C; After shaping, the PAN precursor is obtained.

[0027] Pre-oxidation adopts six temperature zone gradient temperature rise, the temperature is raised from 200°C to 265°C, and the residence time in each temperature zone is about 15 minutes to control the appropriate tension; low temperature carbonization adopts three-stage gradient temperature rise, the temperatures are 350°C, 450°C, 680°C, high-temperature carbonization adopts two-stage gradient heating, and the temperature range is controlled at 1200°C-1400°C. The tensile strength of 1K carbon fiber is 3.87GPa.

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Abstract

The invention relates to an efficient preparation method of polyacrylonitrile-based carbon fibers, belonging to the technical field of preparation of carbon fibers. The invention is characterized in that the technical link of the polyacrylonitrile solvent spinning process is reduced, i.e. a single-channel drawing is adopted instead of the high-temperature drawing technique at higher than 100 DEG C, the drawing temperature is controlled at 80-100 DEG C, the drawing multiple is 3.0-8.0, and the drying densification and thermoforming are completed synchronously; and the subsequent heat treatment process adopts the normal preoxidation and carbonization techniques, thereby achieving the goals of low-cost production of carbon fibers on the premise of not changing the properties of the carbon fibers. The preparation method provided by the invention is simple, and has the advantages of shorter production time and lower production cost.

Description

technical field [0001] The invention relates to a high-efficiency preparation method of polyacrylonitrile-based carbon fibers, specifically changes the drafting conditions in the preparation process of precursors to achieve the purpose of controlling production costs, and belongs to the technical field of carbon fiber preparation. Background technique [0002] Polyacrylonitrile-based carbon fiber refers to the fiber with a carbon content higher than 92% obtained after a series of high-temperature heat treatments. It has high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, size A series of excellent properties such as good stability are typical high-performance carbon fibers. The carbon fiber preparation process mainly includes precursor preparation, pre-oxidation and carbonization. Since the performance of the precursor directly affects the performance of the subsequent carbon fiber, the optim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22
Inventor 徐樑华袁俊崧曹维宇李常清童元建王宇赵振文
Owner BEIJING UNIV OF CHEM TECH
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