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Manufacturing method for 48K polyacrylonitrile-based carbon fiber precursor

A technology of polyacrylonitrile-based carbon fiber and manufacturing method, which is applied in the field of manufacturing 48K polyacrylonitrile carbon fiber precursors, can solve the problems of increased viscosity of the system, slow heat exchange rate, and low yield, and achieve narrow molecular weight distribution. Fast heat rate, less damage effect

Inactive Publication Date: 2016-04-06
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a 48K polyacrylonitrile carbon fiber precursor to solve the problems of slow heat exchange rate, low yield and high cost caused by the increase of the viscosity of the system in the later stage of the polymerization reaction of the existing method for preparing carbon fiber precursor manufacturing method

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0023] According to the present invention, the preparation method of the polymer powder for the polyacrylonitrile-based carbon fiber precursor preferably includes:

[0024] Add acrylonitrile monomer, second monomer, itaconic acid, initiator and deionized water into the polymerization tank, and react at 55-65°C and 100-130rpm for 4-6h under stirring, and the obtained product is desingled, washed, After drying, the polymer powder for polyacrylonitrile-based carbon fiber precursors is obtained.

[0025] According to the present invention, the second monomer is preferably acrylic acid, methacrylic acid, methyl acrylate, acrylamide or methyl methacrylate. The initiator is preferably ammonium persulfate-ammonium sulfite or ammonium persulfate-ammonium bisulfite, the number of ammonium persulfate is preferably 0.1-1.0 parts, and the number of ammonium sulfite or ammonium bisulfite is preferably 0.1-0.75 parts .

[0026] According to the present invention, the weight and number rati...

Embodiment 1

[0031] The acrylonitrile monomer solution is passed through a metering pump according to the ratio of 50% (Wt%), the second monomer methyl acrylate 5% (Wt%), and the third monomer itaconic acid 1.5% (Wt%) is added to the polymerization tank, Add ammonium persulfate and ammonium bisulfite according to the ratio of 0.15% (Wt%) and 0.70% (Wt%) and deionized water 42.65% (Wt%) into the polymerization kettle respectively, keep the temperature at 60°C, and the reaction time is 4 hours , with a stirring rate of 120rpm, the obtained slurry containing acrylonitrile powder is continuously discharged from the polymerization tank, and polymer powder for polyacrylonitrile-based carbon fiber precursors is obtained after single removal, washing and drying. After testing, the weight-average molecular weight of the polymer was 187,000, and the molecular weight distribution index was 2.56.

[0032] Mix the polymer powder for polyacrylonitrile-based carbon fiber precursor obtained above with DMA...

Embodiment 2

[0035] The acrylonitrile monomer solution is according to the ratio of 40% (Wt%) by metering pump, the second monomer acrylic acid 5% (Wt%), the third monomer itaconic acid 4% (Wt%) is added to the polymerization tank, and the Ammonium sulfate and ammonium bisulfite are added in the polymerization kettle according to the ratio of 0.10% (Wt%) and 0.75% (Wt%) and deionized water 50.15% (Wt%) respectively, and the temperature is kept at 65 ° C, and the reaction time is 4 hours. Stir The speed is 120rpm, and the obtained slurry containing acrylonitrile powder is continuously discharged from the polymerization tank, and the polymer powder for polyacrylonitrile-based carbon fiber precursors is obtained after single removal, washing and drying. After testing, the weight average molecular weight of the polymer was 239,000, and the molecular weight distribution index was 2.59.

[0036] Mix the polymer powder for polyacrylonitrile-based carbon fiber precursor obtained above with DMAC at...

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Abstract

The invention provides a manufacturing method for a 48K polyacrylonitrile-based carbon fiber precursor and belongs to the technical field of carbon fiber precursor manufacturing. The method comprises the steps that a polyacrylonitrile-based carbon fiber precursor is mixed with a reaction solvent through polymer powder at the temperature between -18 DEG C and 0 DEG C to prepare slurry, the slurry is vacuumized to be under the pressure between 45 KPa and 90 KPa and dissolved at the temperature between 40 DEG C and 55 DEG C for 1-2 hours, and then a spinning solution is obtained; the obtained spinning solution is squeezed out through a spinning nozzle and enters a spinning pipe in a coagulating bath, the temperature of the coagulating bath is between 30 DEG C and 60 DEG C, the spinning solution is shaped in the spinning pipe and then negatively drafted in the coagulating bath by 0.4-0.9%, and then a polyacrylonitrile nascent fiber is obtained; lastly, the polyacrylonitrile nascent fiber is washed, drawn, oiled, dried and drafted, and then the 48K polyacrylonitrile-based carbon fiber precursor is obtained. Through the method, the heat exchange rate in the later period of a reaction is high, a redox initiation system containing no metal ions is adopted, and production cost is low.

Description

technical field [0001] The invention belongs to the technical field of manufacturing carbon fiber precursors, in particular to a method for manufacturing 48K polyacrylonitrile carbon fiber precursors. Background technique [0002] Polyacrylonitrile-based carbon fiber (PANCF) is a high-performance new fiber material, which has low density, high temperature resistance, chemical corrosion resistance, friction resistance, thermal shock resistance, electrical conductivity, heat conduction, radiation resistance, good damping, shock absorption, drop noise and a series of excellent performance. It is also widely used in building reinforcement, petroleum industry, ocean development, transportation, biomedicine, sports and entertainment, etc., with a large amount and broad market prospects. [0003] High-performance PAN-based carbon fiber is mainly used in aerospace and other fields. It is mainly obtained by carbonizing PAN-based carbon fiber precursors. Its quality depends largely o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/38D01F9/22C08F220/46C08F220/14C08F222/02C08F220/06C08F220/56C08F4/40
CPCD01F6/38C08F4/40C08F220/46D01F9/22C08F220/14C08F222/02C08F220/06C08F220/56
Inventor 敖玉辉尚垒孙立昊庄海林王继军肖凌寒
Owner CHANGCHUN UNIV OF TECH
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