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A kind of preparation method of pan precursor for carbon fiber

A carbon fiber and precursor technology, which is applied in the field of preparation of polyacrylonitrile (PAN) precursor for carbon fiber, can solve the problems of high cost, low efficiency, poor structure of PAN precursor, etc., and achieves high production efficiency, reduced production cost, The effect of reducing cohesive energy

Active Publication Date: 2016-08-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical purpose of the present invention is to provide a new method for preparing PAN precursors for carbon fibers in view of the problems of low efficiency, high cost and poor structure of PAN precursors in the production of PAN precursors for carbon fibers.

Method used

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  • A kind of preparation method of pan precursor for carbon fiber

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Embodiment 1

[0034]Deionized water, acrylonitrile, vinyl acetate, acrylic acid, ammonium persulfate, sodium bisulfite, and ferrous sulfate were weighed and then added to the polymerization kettle with agitator and jacketed constant temperature water system. Based on the quality of water, the mass percentage of acrylonitrile relative to water is 20%, the relative mass percentage of vinyl acetate to acrylonitrile is 7%, the relative mass percentage of acrylic acid to acrylonitrile is 3%, and the relative mass percentage of ammonium persulfate to acrylonitrile The percentage is 0.6%, the mass percentage of sodium bisulfite relative to acrylonitrile is 0.8%, and the mass ratio of ferrous sulfate to acrylonitrile is 1ppm. Sulfuric acid was used to adjust the pH value to 2.5, and the reaction was carried out for 50 min at a temperature of 58° C. and a stirring speed of 60 rpm. After the reaction, the pH value of the polymerization system was adjusted to 10 with ammonia water. After separation, ...

Embodiment 2

[0041] Deionized water, acrylonitrile, vinyl acetate, methacrylic acid, ammonium persulfate, sodium bisulfite, and ferrous sulfate were weighed and then added to the polymerization kettle with agitator and jacketed constant temperature water system. Based on the quality of water, the mass percentage of acrylonitrile relative to water is 21%, the relative mass percentage of vinyl acetate to acrylonitrile is 6%, the relative mass percentage of methacrylic acid to acrylonitrile is 2%, and the relative mass percentage of ammonium persulfate to acrylonitrile is 2%. The mass percentage of ferrous sulfate is 1%, the mass percentage of sodium bisulfite relative to acrylonitrile is 2%, and the mass ratio of ferrous sulfate to acrylonitrile is 3ppm. Sulfuric acid was used to adjust the pH value to 3, and the reaction was carried out for 60 min at a temperature of 60° C. and a stirring speed of 60 rpm. After the reaction, the pH value of the polymerization system was adjusted to 9 with a...

Embodiment 3

[0048] Deionized water, acrylonitrile, vinyl acetate, itaconic acid, ammonium persulfate, sodium bisulfite, and ferrous sulfate were weighed and then added to the polymerization kettle with agitator and jacketed constant temperature water system. Based on the quality of water, the mass percentage of acrylonitrile relative to water is 20%, the relative mass percentage of vinyl acetate to acrylonitrile is 2%, the relative mass percentage of itaconic acid to acrylonitrile is 2%, and the relative mass percentage of ammonium persulfate to acrylonitrile is 2%. The mass percentage of sodium bisulfite is 0.3%, the mass percentage of sodium bisulfite relative to acrylonitrile is 0.5%, and the mass ratio of ferrous sulfate to acrylonitrile is 7ppm. Sulfuric acid was used to adjust the pH value to 2.5, and the reaction was carried out for 70 min at a temperature of 65° C. and a stirring speed of 80 rpm. After the reaction, the pH value of the polymerization system was adjusted to 10 with...

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Abstract

The invention provides a method for preparing polyacrylonitrile (PAN) precursors for carbon fibers. The method first adopts an aqueous phase precipitation polymerization process to produce PAN polymer, specifically: ammonium persulfate-sodium bisulfite-ferrous sulfate is used as the initiation system, vinyl acetate is used as the second comonomer, and carboxylic acid vinyl The compound is the third comonomer, sulfuric acid is used as the pH regulator, and the precipitation copolymerization reaction is carried out with acrylonitrile in the water phase with a pH value of 2 to 5. After the reaction is completed, the reaction system is alkalized with ammonia water, and then After separation, washing and drying, the PAN polymer powder is obtained; then, the PAN polymer powder is dissolved in a polar organic solvent to prepare a PAN spinning solution, and then the PAN precursor is prepared by a wet spinning process. The method has low cost and high production efficiency, and the prepared PAN precursor has a good structure, can meet the requirements of large-scale production of carbon fibers, and is beneficial to improving the performance of carbon fibers and reducing production costs.

Description

technical field [0001] The invention relates to the technical field of carbon fiber preparation, in particular to a method for preparing polyacrylonitrile (PAN) precursors for carbon fibers. Background technique [0002] Carbon fiber is a well-known high-tech fiber material with a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, good electrical and thermal conductivity, and small thermal expansion coefficient. Advanced composite materials reinforced with carbon fiber have played an irreplaceable role in key components of military and civil aircraft, as well as strategic missiles and launch vehicles. In recent years, with the increasingly prominent problems of energy shortage and environmental pollution, the lightweight automobile technology using carbon fiber composite materials has attracted more and more attention. Using carbon fiber reinforced resin-based composite materials instead o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/44C08F218/08C08F220/06C08F222/02C08F4/40C08F6/06D01F6/40D01F9/22D01D5/06D01D10/02
Inventor 欧阳琴陈友汜皇静黄显雯莫高明杨建行
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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