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Method for preparing high-modulus carbon fiber by adopting precursor drawing technology

A carbon fiber and fiber technology, which is applied in the field of preparing high-strength and high-modulus carbon fiber, can solve the problems of affecting the mechanical properties of fibers, the method of physically stretching the fiber properties of the original silk fiber, and the cumbersome processing of equipment, etc. Oxidation and carbonization efficiency, effect of reducing fiber microscopic damage

Inactive Publication Date: 2015-12-30
THE NORTHWEST RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above patent applications require major changes to the existing equipment, and the processing of the equipment is cumbersome, or other inorganic elements are introduced while improving the thermal stability of the fiber, which will seriously affect the mechanical properties of the fiber during the high-temperature carbonization process, and the performance will not increase. reduce
[0005] At present, in the process of high-temperature treatment of polyacrylonitrile precursor fibers, most of the research focuses on the pre-oxidation gradient, pre-oxidation time, low / high temperature carbonization temperature and draft ratio, but it is often easy to miss the improvement of physical stretching of the precursor fiber. Methods of Fiber Properties

Method used

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  • Method for preparing high-modulus carbon fiber by adopting precursor drawing technology
  • Method for preparing high-modulus carbon fiber by adopting precursor drawing technology

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Effect test

Embodiment 1

[0105] Embodiment 1: Adopt the method of the present invention to produce high-strength high-modulus carbon fiber

[0106] The implementation steps of this embodiment are as follows:

[0107] A. Preparation of spinning solution and wet spinning

[0108] It will be produced by Northwest Research Institute of Chemical Industry and sold under the trade name PAN-P1 with a weight average molecular weight of 3×10 5 The above polyacrylonitrile polymer was dissolved in dimethyl sulfoxide solvent to obtain a solution containing 95.2% by weight of polyacrylonitrile and 1.0% of unsaturated carboxylic acid comonomer, and the solution was placed under pressure 3.2kPa to remove the monomer contained in it and the entrained air bubbles, so that the spinning solution is clear and free of air bubbles. Then use a candle wick filter sold by Shanghai Runlan Filtration Equipment Co., Ltd. under the trade name RH-ZS candle filter to filter, and use the method described in the specification to mea...

Embodiment 2

[0120] Embodiment 2: adopt the inventive method to produce high strength high modulus carbon fiber

[0121] The implementation steps of this embodiment are as follows:

[0122] A. Preparation of spinning solution and wet spinning

[0123] The weight average molecular weight to be sold by Beijing Chemical Co., Ltd. under the trade name acrylonitrile is 3×10 5 The above polyacrylonitrile polymer was dissolved in dimethyl sulfoxide solvent to obtain a solution containing 95.5% by weight polyacrylonitrile and 0.5% unsaturated carboxylic acid comonomer, and the solution was placed under pressure 3.8kPa to remove the monomers contained in it and the entrained air bubbles, so that the spinning solution is clear and free of air bubbles, and then use the candles sold by Shanghai Si Filter Environmental Protection Equipment Co., Ltd. under the trade name Si Filter SL-ACF filter Cartridge filter is filtered, adopts the method described in specification to measure, and the viscosity of ...

Embodiment 3

[0135] Embodiment 3: Adopt the method of the present invention to produce high-strength high-modulus carbon fiber

[0136] The implementation steps of this embodiment are as follows:

[0137] A. Preparation of spinning solution and wet spinning

[0138] To be sold under the trade name Acrylonitrile by Shanghai Jinjinle Industrial Co., Ltd. has a weight average molecular weight of 3×10 5 The above polyacrylonitrile polymer was dissolved in dimethyl sulfoxide solvent to obtain a solution containing 95.8% by weight of polyacrylonitrile and 2.1% of unsaturated carboxylic acid comonomer, and the solution was placed under pressure 3.0kPa to remove the monomers contained in it and the entrained air bubbles to achieve the degree of clarity and no air bubbles in the spinning solution, and then use the candle wick sold by Shanghai Jiayu Filtration Equipment Co., Ltd. under the trade name ZL series candle type airtight filter Type filter to filter, using the method described in the ins...

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Abstract

The invention relates to a method for producing a high-modulus carbon fiber by adopting a precursor drawing technology. The method comprises the following steps: preparing a spinning solution, carrying out the wet-method spinning, solidifying a nascent fiber, drawing in steam, stretching a precursor to precursor fiber, pre-oxidizing the fiber, and carbonizing the fiber. By adopting the method, the defect of a micro structure in the fiber precursor preparation process can be effectively reduced, compared with the process which does not utilize the process, the orientation degree of the pre-oxidized fiber is further improved, and the mechanical performance of the carbonized fiber is remarkably improved; since the fiber is re-stretched at a temperature above a vitrification temperature, the fiber fineness is reduced, the specific surface area is increased in the high-temperature treatment process, and the thermal treatment efficiency is effectively improved; by virtue of the process, the fiber quality is obviously improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of high-performance fiber processing. More specifically, the present invention relates to a method for preparing high-strength and high-modulus carbon fibers by using the raw wire drawing technology. 【Background technique】 [0002] High-strength and high-modulus carbon fiber is a special fiber made of polyacrylonitrile organic fiber through carbonization treatment. It has excellent characteristics such as high specific strength, specific modulus, electrical conductivity, low thermal expansion coefficient and corrosion resistance. Utilizing its flexibility and anisotropy, it is woven and often used as a composite material reinforcement material, which is widely used in military, civil industry and other fields. [0003] The carbon fiber preparation process is complicated, the process is cumbersome, and the equipment and technology requirements are high. High-quality polyacrylonitrile fiber is the prerequis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F11/14
Inventor 张力陈黎王小安张晓利张华东
Owner THE NORTHWEST RES INST OF CHEM IND
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