Low-diameter high-strength polyacrylonitrile-based carbon fibers and preparation method thereof

A polyacrylonitrile-based carbon fiber, polyacrylonitrile spinning technology, applied in the direction of fiber raw material processing, fiber chemical characteristics, synthetic cellulose/non-cellulose material pulp/paper, etc.

Active Publication Date: 2019-03-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest problem in the preparation of small-diameter carbon fibers is to control the fibrillation and drawability of the spinning solution. Therefore, the smallest diameter carbon fi

Method used

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  • Low-diameter high-strength polyacrylonitrile-based carbon fibers and preparation method thereof
  • Low-diameter high-strength polyacrylonitrile-based carbon fibers and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of polyacrylonitrile spinning solution

[0028]Acrylonitrile, itaconic acid, and methyl acrylate were blended and put into the polymerization reactor at a molar ratio of 93:1:6, and then a dimethyl sulfoxide solvent with a mass ratio of 5.45:1 to the monomer was added, and the initiator was added Azobisisobutyronitrile (AIBN), the amount of initiator is 0.2% (molar concentration) of the monomer, stirred and polymerized at a temperature of 55°C and a speed of 40rpm, and the molar ratio of adding and itaconic acid is 0.3:1 when reacting for 10 hours 1,2-ethanediol, after 22 hours of polymerization reaction, a spinning stock solution of an acrylonitrile copolymer with a molecular weight of 120,000 was obtained, and the viscosity of the spinning stock solution at 25°C was measured at 200 poise by a rotational viscometer;

[0029] Spinning solution was obtained after de-monolysis and de-aeration, and the content of acrylonitrile copolymer in the obtained poly...

Embodiment 2

[0045] (1) Preparation of polyacrylonitrile spinning solution

[0046] Acrylonitrile, itaconic acid, and methyl acrylate were blended and put into the polymerization reactor at a molar ratio of 95:1:4, and then dimethyl sulfoxide solvent with a mass ratio of 6.41:1 to the monomer was added, and the initiator was added Azobisisobutyronitrile (AIBN), the amount of the initiator is 0.2% (molar concentration) of the monomer, stirred and polymerized at a temperature of 57°C and a speed of 35rpm, and adding itaconic acid in a molar ratio of 0.25:1 after reacting for 10 hours 1,3-propanediol, after 22 hours of polymerization reaction, the spinning stock solution of acrylonitrile copolymer with a molecular weight of 105,000 was obtained, and the viscosity of the spinning stock solution at 25°C was measured as 170 poise by a rotational viscometer;

[0047] Spinning solution was obtained after de-monolarization and defoaming, and the content of acrylonitrile copolymer in the spinning so...

Embodiment 3

[0052] (1) Preparation of polyacrylonitrile spinning solution

[0053] Acrylonitrile, itaconic acid, and methyl acrylate were blended and put into the polymerization reactor at a molar ratio of 94:1:5, and then dimethyl sulfoxide solvent with a mass ratio of 6.81:1 to the monomer was added, and the initiator was added Azobisisobutyronitrile (AIBN), the amount of the initiator is 0.18% (molar concentration) of the monomer, stirred and polymerized at a temperature of 53°C and a speed of 30rpm, and adding itaconic acid in a molar ratio of 0.2:1 after reacting for 10 hours 1,3-propanediol, after 22 hours of polymerization reaction, the spinning stock solution of acrylonitrile copolymer with a molecular weight of 133,000 was obtained, and the viscosity of the spinning stock solution at 25°C was measured by a rotational viscometer to be 230 poises;

[0054] Spinning solution is obtained after de-monolarization and degassing, and the content of acrylonitrile copolymer in the spinning...

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Abstract

The invention relates to low-diameter high-strength polyacrylonitrile-based carbon fibers and a preparation method thereof. According to the method, acrylonitrile containing itaconic acid and methyl methacrylate is used as a ternary polymerization system, and an organic diol crosslinking agent is added in a polymerization process for polymerizing, so that a spinning stock solution which has a polymer content of 12.5-17.5% and a viscosity of 120-800 CP is obtained; due to the addition of the crosslinking agent, the spinnability and high drafting of the spinning solution with low polymer contentand low viscosity are improved; then, a wet spinning process is adopted and matched with reasonable solidification conditions and a spinning drafting process, so that low-diameter polyacrylonitrile precursor with surface grooves is prepared; the precursor is pre-oxidized, and is carbonized at a low temperature and a high temperature, so as to obtain the monofilament which has the equivalent diameter of 2-3 mum, the tensile strength of more than or equal to 3.5 GPa, and the tensile modulus of more than or equal to 230 Gpa; therefore, the low-diameter and high-strength polyacrylonitrile-based carbon fibers with a regular surface groove structure are obtained. The carbon fiber obtained by method can improve the flexibility of carbon fiber paper for fuel cells.

Description

technical field [0001] The invention relates to a low-diameter high-strength polyacrylonitrile-based carbon fiber and a preparation method thereof, belonging to the field of carbon material preparation. Background technique [0002] Energy issues have always been an important issue related to national security and social stability. Traditional energy sources often have strong environmental pollution. In today's society that advocates green development, the importance of new energy development and utilization is self-evident. Metaphor. As a new generation of clean and efficient power generation devices, clean and efficient new energy fuel cells are favored by people for their low operating temperature, fast start-up speed, and high power density. Carbon fiber paper has become a key material for key components of fuel cells due to its electrical conductivity, chemical stability, thermal stability, and porous air permeability. Obviously, carbon fiber is the best material for ...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F6/38C08F220/44C08F222/02C08F220/14D21H13/50
CPCC08F220/44D01F6/38D01F9/22D21H13/50C08F222/02C08F220/14
Inventor 王宇徐樑华李常清高爱君童元建曹维宇赵振文
Owner BEIJING UNIV OF CHEM TECH
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