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Preparation method of polymer for polyacrylonitrile base carbon fiber precursors

A technology of polyacrylonitrile-based carbon fiber and raw silk, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of low efficiency of the triggering system and achieve the effect of highlighting the substantive characteristics.

Active Publication Date: 2008-04-16
吉林碳谷碳纤维股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Shandong University Chinese Patent No. ZL200610070589.8 proposes a new method for the production of carbon fiber precursors by aqueous phase suspension polymerization. The polymerization technology uses a single ammonium persulfate as the initiator. Compared with the oxidation-reduction initiation system, the initiation system less efficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The acrylonitrile monomer solution is according to the ratio of 10% (Wt%) through the metering pump, the second monomer acrylamide 3% (Wt%), the third monomer itaconic acid 1.5% (Wt%) is added to the polymerization tank, the Ammonium persulfate and ammonium sulfite are added in the polymerization kettle according to the ratio of 0.10% (Wt%) and 0.75% (Wt%) and acidified deionized water 84.65% (Wt%) respectively, and the temperature is maintained at 6 ° C, and the reaction time is 6 hours , stirring rate 100rpm. The slurry containing polyacrylonitrile powder is continuously discharged from the polymerization kettle, and polyacrylonitrile powder is obtained after single removal, washing and drying. The obtained copolymer has a weight average molecular weight of 189,000 and a molecular weight distribution index of 2.86. Spinning under standard conditions, the raw fiber strength is 6.21g / d, carbonized under standard conditions, the carbon fiber strength is 3.82GPa.

Embodiment 2

[0019] According to the ratio of 50% (Wt%) by metering pump, acrylonitrile monomer solution, the second monomer acrylamide 2% (Wt%), the third monomer itaconic acid 1.5% (Wt%) is added to the polymerization tank, the Ammonium persulfate and ammonium sulfite are added in the polymerization kettle according to the ratio of 1.0% (Wt%) and 0.1% (Wt%) and acidified deionized water 45.4% (Wt%) respectively, and the temperature is maintained at 6°C. Time 6 hours, stirring rate 100 rpm. The slurry containing polyacrylonitrile powder is continuously discharged from the polymerization kettle, and polyacrylonitrile powder is obtained after single removal, washing and drying. The obtained copolymer has a weight average molecular weight of 175,000 and a molecular weight distribution index of 2.70. Spinning under standard conditions, the original filament strength is 6.01CN / dtex, and carbonizing under standard conditions, the carbon fiber strength is 3.61GPa.

Embodiment 3

[0021] The acrylonitrile monomer solution is passed through a metering pump according to the ratio of 30% (Wt%), the second monomer methyl acrylate 1% (Wt%), and the third monomer itaconic acid 0.5% (Wt%) is added to the polymerization tank, Ammonium persulfate and ammonium sulfite are added in the polymerization kettle according to the ratio of 0.15% (Wt%) and 0.75% (Wt%) and acidified deionized water 67.6% (Wt%) respectively, and the temperature is maintained at 60°C. The reaction time was 5 hours, and the stirring rate was 100 rpm. The slurry containing polyacrylonitrile powder is continuously discharged from the polymerization kettle, and polyacrylonitrile powder is obtained after single removal, washing and drying. The obtained copolymer has a weight average molecular weight of 205,000 and a molecular weight distribution index of 2.85. Spinning under standard conditions, the strength of raw silk is 6.41CN / dtex, and carbonization under standard conditions, the strength of...

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Abstract

A method for preparing polymer for PAN precursor, by copolymerizing the water phase suspend using ammonium persulphate-ammonium sulfite or ammonium bisulfite as a primosome, is disclosed. The polyacrylonitrile powder material is obtained by adding the first monomer acrylonitrile, the second monomer crylic acid, methyl acrylate or acrylamide, and the third itaconic acid, or the first monomer crylic acid, the second monomer methyl acrylate or itaconic acid, and inorganic oxidation-reduction primosome without any metallic ion which comprises ammonium persulphate, ammonium sulfite or ammonium bisulfite and acidified deionized water into the polymerization kettle in defined proportions, controlling the temperature and stirring to react for a time, and discharging by removing the residual monomer, washing and drying. The average molecular weight is from 17.5 myriads to 26.1 myriads, and the distribution index of molecular weight is from 2.70 to 2.91; the intension of polyacrylonitrile precursor tested by spinning sample is from 4.58 to 6.61 CN / dtex; and the carbon fiber strength is 3.61-5.06MPa.

Description

technical field [0001] The invention relates to a method for preparing polyacrylonitrile-based precursor powder, in particular to a method for preparing a polymer for polyacrylonitrile-based carbon fiber precursor. technical background [0002] Carbon fiber is a reinforced and functional fiber material with high strength ratio and high specific modulus. It is a high-tech product developed rapidly in the 1960s. It has a series of comprehensive properties such as low density, heat resistance, chemical corrosion resistance, friction resistance, thermal shock resistance, electrical conductivity, heat conduction, radiation resistance, good damping, shock absorption, and noise reduction. It has been widely used in sports equipment. , entertainment and leisure, tourism facilities, automobile components, train parts, aircraft manufacturing, electric power, petroleum, chemical industry, navigation, biomedicine, construction, strategic missiles, bulletproof armor and many other fields...

Claims

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Application Information

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IPC IPC(8): C08F220/44C08F4/30D01F9/22C08F220/06C08F220/10C08F220/56
Inventor 张会轩王进军马俊庄海林敖玉辉王红军周宝庆
Owner 吉林碳谷碳纤维股份有限公司
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