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A polyacrylonitrile fiber and ionic liquid technology, applied in the direction of fiber chemical characteristics, rayon manufacturing, single-component synthetic polymer rayon, etc., can solve the problems of increased internal defects of fibers, complex process flow, and low production efficiency , to achieve the effects of low solvent residue, lower dissolution temperature, and lower energy consumption
Active Publication Date: 2021-05-25
SHANDONG RENFENG SPECIAL MATERIALS
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Although the fibers prepared by this patent have good bundle property and are not easy to scatter, the preparation method has complex process flow and low production efficiency, and the spinning stock solution is directly solidified after being extruded from the spinneret hole. With the increase of the traction speed, the spinning As the drafting ratio increases, broken filaments are likely to occur at the spinneret hole, and the internal defects of the fiber increase during the drying and densification process.
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Embodiment 10
[0031] The main solvent (i.e. the benign solvent of polyacrylonitrile) is dimethylformamide, the secondary solvent is dichloromethane, and the ionic liquid is 1-ethyl-3-methylimidazolium tetrafluoroborate, according to the raw materials in the table Ratio, preparation method is identical with embodiment 1.
Embodiment 11
[0033] The main solvent (i.e. the benign solvent of polyacrylonitrile) is dimethylformamide, the secondary solvent is n-hexane, and the ionic liquid is 1-ethyl-3-methylimidazolium tetrafluoroborate, according to the raw material composition in Table 1 Ratio, preparation method is identical with embodiment 1.
Embodiment 12
[0035] Taking the main solvent (i.e. the benign solvent of polyacrylonitrile) as dimethyl sulfoxide, the secondary solvent as dichloromethane, and the ionic liquid as N-alkylpyridine chloroaluminate as an example, according to the ratio of raw materials in Table 1, prepare Method is identical with embodiment 1.
[0036] See Table 1 for the performance tests of the polyacrylonitrile fibers prepared in Examples and Comparative Examples.
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Abstract
The invention discloses a preparation method of a polyacrylonitrile fiber. Polyacrylonitrile is firstly swelled and dissolved in an ionic liquid and a high-boiling-point (150-190 DEG C) solvent in a certain proportion under the conditions of high temperature and high pressure, then a volatile or low-boiling-point (30-60 DEG C) solvent is added to obtain a homogeneous spinning solution, then spinning and traction splitting are carried out to prepare the polyacrylonitrile fiber, and the polyacrylonitrile fiber has the advantages that the solvent is not prone to being wrapped in the fiber, and the fiber defect is improved; and the prepared fiber has the technical effects of denser density and thinner diameter.
Description
technical field [0001] The invention belongs to the technical field of fiber preparation, and relates to a method for preparing polyacrylonitrile fibers. Background technique [0002] Carbon fiber is a new material developed to meet the needs of cutting-edge industries such as aerospace, aviation, and atomic energy. It has high tensile strength, high tensile modulus, low density, high temperature resistance, ablation resistance, corrosion resistance, high Excellent properties such as electrical and thermal conductivity, low thermal expansion, self-lubrication and good biocompatibility. There are many precursors for preparing carbon fibers, such as polyacrylonitrile (PAN), viscose fiber, pitch polyacrylonitrile, polyethylene, lignin, polyimide, phenolic resin, polybenzothiazole, etc., as raw materials, but so far So far, only three kinds of polyacrylonitrile, viscose and asphalt have been produced on an industrial scale. Among them, the performance of pitch-based carbon fibe...
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