A kind of preparation method of polyacrylonitrile fiber
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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: 2022-03-18
SHANDONG RENFENG SPECIAL MATERIALS
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Problems solved by technology
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 The method is the same as in Example 1.
[0036] The performance tests of the polyacrylonitrile fibers prepared in Examples and Comparative Examples are shown in Table 1.
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Abstract
In the present invention, polyacrylonitrile is first swelled and dissolved in a certain proportion of ionic liquid and high boiling point (150-190°C) solvent under high temperature and high pressure conditions, and then added with volatile or low boiling point (30-60°C) solvent to obtain a homogeneous Spinning liquid, then spinning, drawing and opening to prepare polyacrylonitrile fiber, which has the technical effect of making the solvent less likely to be wrapped inside the fiber and improving fiber defects; the prepared fiber is denser and has a finer 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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