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Method for preparing polyacrylonitrile based carbon fibre spinning solution

A polyacrylonitrile-based carbon and fiber spinning technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, etc., to achieve the effects of reducing residual initiator content, improving PAN purity, and simple process

Inactive Publication Date: 2003-03-12
ZHONGJIAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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Examples

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Embodiment 1

[0009] Example 1: (1) Weigh 600 grams of purified acrylonitrile, 6000 grams of dimethylformamide, 6 grams of water, 12 grams of acetic acid, add 3 grams of azobisisobutyronitrile, under nitrogen protection at 70 ° C React for 1 hour. (2) Pass ammonia gas through the system to make PH = 9, and terminate the polymerization reaction. (3) Continue to pass ammonia gas to adjust the pH to 11, raise the system temperature to 95° C., hydrolyze for 40 minutes, remove the single and defoam, and obtain the spinning solution.

Embodiment 2

[0010] Embodiment 2: (1) take by weighing 400 grams of purified acrylonitrile, 800 grams of dimethylformamide, 40 grams of water, 2 grams of formic acid, add 1 gram of azobisisobutyronitrile, under nitrogen protection at 50 °C for 15 hours. (2) Feed ammonia gas into the system to make PH = 8, and terminate the polymerization reaction. (3) Continue to pass ammonia gas to adjust the pH to 14, raise the system temperature to 100° C., hydrolyze for 5 minutes, remove single and defoam, and obtain a spinning solution.

Embodiment 3

[0011] Embodiment 3: (1) take by weighing 1000 grams of purified acrylonitrile, 3600 grams of dimethylformamide, 20 grams of water, 20 grams of formamide, add 5 grams of azobisisobutyronitrile, under nitrogen protection React at 60°C for 8 hours. (2) Feed ammonia gas into the system to make PH=9, and the polymerization reaction is terminated. (3) Maintain the pH at 9, raise the temperature of the system to 80° C., hydrolyze for 2 hours, remove the single and defoam, and obtain the spinning solution.

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Abstract

A polyacrylnitrile-base carbon fibre spinning liquid is prepared from acrylnitrile, dimethyl formamide, distilled water, azodiisobutylnitrile and chain transfer agent through homopolymerization, introducing ammonia gas to stop reaction, and regulating pH value by ammonia gas. Its advantages are uniform distribution of function groups on macro-molecular chain, simple process and easy control.

Description

[0001] Field: [0002] The invention belongs to a method for preparing a carbon fiber spinning solution, in particular to a method for preparing a polyacrylonitrile-based carbon fiber spinning solution. Background technique: [0003] Cyclization is an important link in the process of carbon fiber preparation. The introduction of comonomer can transform the free radical cyclization reaction of homopolymer into ionic cyclization reaction process, which reduces the activation energy of cyclization reaction, thereby reducing The onset temperature of the exothermic peak is controlled, and the exothermic rate is suppressed. At the same time, the introduction of comonomers can regulate the supramolecular structure effect of polyacrylonitrile (PAN), increase the flexibility of polymer molecular segments, thereby achieve the purpose of improving the spinnability of polymers, and facilitate spinning The drafting orientation in the process. Commonly introduced comonomers are: acrylic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/44D01F9/22
Inventor 凌立成杨永岗温月芳张寿春吕春祥
Owner ZHONGJIAN TECH CO LTD
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