Method for preparing high performance carbon fiber by controlling tensile force

A carbon fiber, high-performance technology, applied in the field of preparation of high-performance carbon fiber, can solve the problem of aggravating carbon fiber wool, achieve the effect of reducing the degree of wool and improving mechanical properties

Inactive Publication Date: 2012-06-20
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the draft ratio is mainly used as the measurement standard, but this method ignores the differences of individual fibers in the fiber bundle, so that some individual fibers are forced to stretch to the set draft ratio and break, which aggravates all carbon fiber wool

Method used

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  • Method for preparing high performance carbon fiber by controlling tensile force
  • Method for preparing high performance carbon fiber by controlling tensile force
  • Method for preparing high performance carbon fiber by controlling tensile force

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The 48K polyacrylonitrile copolymer fiber produced by Asahi Kasei Co., Ltd. of Japan is used. The polymerized monomers and mass fractions used in the fiber are: 92% acrylonitrile, 7% allyl chloride, and 1% α-chloropropene. In the low temperature synchronous modification stage (such as figure 1 shown in the device), through the real-time adjustment of the speed of the front and rear two groups of driving rollers, a tension of 5 MPa is applied to the fibers. In the air medium, the temperature in the furnace is 120 ° C, and the residence time of the fibers in the furnace is 4 minutes, and low temperature synchronization is obtained. Modified fibers; the fibers after synchronous modification at low temperature are subjected to thermo-oxidative stabilization treatment at 200°C, 230°C, 255°C and 280°C in air medium, and the residence time in each temperature zone is 15min, totaling 60min. The draft ratio is 9%, and the thermal oxygen stabilized fiber is obtained; under the pr...

Embodiment 2

[0014] The 48K polyacrylonitrile copolymer fiber produced by Japan Asahi Kasei Co., Ltd. is used to apply a tension of 11 MPa to the fiber at low temperature synchronous modification. In the air medium, the temperature in the furnace is 140 ° C, and the residence time of the fiber in the furnace is 4 minutes. Simultaneously modified fibers, other process parameters and operations are the same as in Example 1.

Embodiment 3

[0016] The 48K polyacrylonitrile copolymer fiber produced by Japan Asahi Kasei Co., Ltd. is used, and a tension of 17 MPa is applied to the fiber at low temperature synchronous modification. In the air medium, the temperature in the furnace is 150 ° C, and the residence time of the fiber in the furnace is 6 minutes. Simultaneously modify the fiber; other process parameters and operations are the same as in Example 1.

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Abstract

A method for preparing high performance carbon fiber by controlling tensile force is characterized in that polyacrylonitrile copolymer fiber is placed in a thermal treatment furnace at the temperature ranging from 120 to 200 DEG C, 5 to 30 MPa of tensile force is exerted, and low temperature synchronous modification treatment is conducted for 2 to 10 minutes in the presence of air dielectric. Processed fiber is processed through thermal oxidation stabilization and carbonization to obtain carbon fiber. Tensile strength of the obtained carbon fiber is higher than 3.5 GPa.

Description

Technical field: [0001] The invention relates to a method for preparing high-performance carbon fibers. Background technique: [0002] Carbon fiber has the advantages of high strength, high modulus, light weight, small thermal expansion coefficient, ablation resistance, fatigue resistance, creep resistance, and electrical conductivity. It is widely used in various fields such as aerospace, military industry, and civilian use. Polyacrylonitrile copolymer fiber is an ideal precursor for the preparation of carbon fiber, which mainly undergoes stages of thermo-oxidative stabilization, low-temperature carbonization and high-temperature carbonization. In this process, drawing is an essential process, which can keep the polyacrylonitrile molecular chain in a certain orientation and prevent the molecular chain from returning to the disordered state before spinning due to heating. At present, the draft ratio is mainly used as the measurement standard, but this method ignores the dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F9/32
Inventor 刘杰连峰马兆昆梁节英
Owner BEIJING UNIV OF CHEM TECH
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