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.
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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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