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Low-cost preparation method of carbon fiber precursor fibers, preoxidized fibers or carbon fibers

A technology of precursor fibers and carbon fibers, which is applied in the chemical characteristics of fibers, preparation of spinning solutions, wet spinning, etc., can solve the problems of increasing the amount of waste water, increasing the cost of spinning production, and reducing fiber performance.

Active Publication Date: 2019-03-08
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvent components in the coagulation bath will eventually enter the wastewater treatment section, which directly increases the amount of wastewater and increases the cost of the entire spinning production
In the existing spinning technology, if the coagulation bath composition only contains poor solvents, under the disclosed production process conditions, the spinning solution will solidify rapidly when encountering poor solvents, forming a skin-core structure and reducing fiber performance.

Method used

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  • Low-cost preparation method of carbon fiber precursor fibers, preoxidized fibers or carbon fibers
  • Low-cost preparation method of carbon fiber precursor fibers, preoxidized fibers or carbon fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Acrylonitrile, methyl acrylate and itaconic acid (molar ratio 98:0.5:1.5) were added to water (total monomer mass concentration 23%) according to the ratio, and the molecular weight of 70,000 was obtained by suspension polymerization. PAN polymer with a molecular weight distribution coefficient of 1.5 (wherein the comonomer molar content is 2%). The PAN polymer obtained by polymerization is dissolved in a mixed solution of dimethyl sulfoxide solvent and dimethylacetamide (mass ratio of 5:95) to prepare a spinning solution with a solid content of 28 wt%. The viscosity of the spinning solution is 25 Pa.s, the gel point is -28°C, and the gel interval is within 9°C. Use stainless steel metal fiber sintered felts with precisions of 8μm and 0.5μm to filter the spinning solution in turn, and then transfer the spinning solution to a deaerator for defoaming and spinning. The wet spinning method is used for spinning, the temperature of the spinning solution is 45°C, the spinneret...

Embodiment 2

[0069] Acrylonitrile and methacrylic acid (molar ratio of 99.7:0.03) were added to n-heptane (total monomer mass concentration of 9%) according to the ratio, and a molecular weight of 960,000 and a molecular weight distribution coefficient of 5.8 was obtained by polymerization. PAN polymer (wherein the comonomer molar content is 0.03%). The PAN polymer obtained by polymerization is dissolved in dimethylacetamide to prepare a spinning solution with a solid content of 5.2 wt%. The viscosity of the spinning solution is 130 Pa.s, the gel point is 16°C, and the gel interval is within 4.5°C. Use non-woven fabric mats with precisions of 5μm and 0.2μm to filter the spinning solution in turn, and then transfer the spinning solution to a deaerator for defoaming and spinning. The wet spinning method is used for spinning, the temperature of the spinning solution is 40°C, the spinneret hole is a circular spinneret hole, and the hole diameter is 0.070mm. In the spinning process, two coagul...

Embodiment 3

[0071] Acrylonitrile and methacrylic acid (molar ratio 96:4) were added to the zinc chloride solution (total monomer mass concentration 23%) according to the ratio, and the molecular weight was 440,000 and the molecular weight distribution coefficient was 3.7 through polymerization. PAN polymer (in which the molar content of comonomer is 4%). The PAN polymer obtained by polymerization is dissolved in dimethylformamide to prepare a spinning solution with a solid content of 9.5% by weight. The viscosity of the spinning solution is 95 Pa.s, the gel point is 8°C, and the gel interval is within 4°C. Use stainless steel metal fiber sintered felts with a precision of 2μm and 0.3μm to filter the spinning solution in turn, and then transfer the spinning solution to a deaerator for defoaming and spinning. The wet spinning method is used for spinning, the temperature of the spinning solution is 35°C, the spinneret hole is a C-shaped spinneret hole, the outer diameter is 0.076mm, and the ...

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Abstract

A low-cost preparation method of carbon fiber precursor fibers, preoxidized fibers or carbon fibers is characterized in that an acrylonitrile polymer is dissolved through a solvent to obtain a uniformspinning solution; the spinning solution forms fine spinning flow through spinning pores, and then the fine spinning flow enters a coagulating bath component which is below the spinning solution geltemperature point to obtain primary fibers; the primary fibers are processed by stretching, washing, drying and oiling to obtain the carbon fiber precursor fibers; and the carbon fiber precursor fibers are pre-oxidized and carbonized to obtain the preoxidized fibers or carbon fibers. The method has the advantages of being low in cost, high in fiber performance and stable to produce in a high-powerstretching condition.

Description

Technical field [0001] The invention relates to a chemical fiber product and a preparation method thereof, in particular to a method for manufacturing a carbon fiber precursor and a method for preparing preoxidized fibers and carbon fibers by using the carbon fiber precursor fiber. Background technique [0002] Because carbon fiber has excellent properties such as high specific strength, high specific modulus, and corrosion resistance, composite materials using it as a reinforcement have been widely used in aerospace, defense industry, sporting goods, new automobile industry, new energy and other fields. At present, the most widely used carbon fiber is polyacrylonitrile (hereinafter sometimes referred to as PAN)-based carbon fiber. Its preparation method is to copolymerize acrylonitrile and certain monomers to obtain PAN. The PAN-containing spinning solution is used for wet spinning and dry spinning. Spinning or dry spray wet method to obtain PAN nascent fiber, obtain carbon fibe...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F6/38D01D1/02D01D5/06
CPCD01D1/02D01D5/06D01F6/38D01F9/22
Inventor 周普查刘耀东吕春祥安锋于毓秀
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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