Method for preparing fast-oxidized polyacrylonitrile fiber
A technology of polyacrylonitrile fiber and polyacrylonitrile powder, which is applied in the field of preparation of polyacrylonitrile fiber, can solve the problems of reduced mechanical properties of carbon fiber, prolonging the pre-oxidation time, and aggravating the skin-core structure, so as to reduce the cost of carbon fiber and improve the pre-oxidation process. Oxidation rate, effect of improving structural compactness
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[0025] Example 1
[0026] The dried polyacrylonitrile and 1-butyl-3-methylimidazole chloride salt type ionic liquid are mixed uniformly at a ratio of 1:1.8, and the mixture is added to the twin screw and air is blown into the twin screw for spinning. The spinning temperature is 160°C, and the winding speed is 400m / min. The spun spun yarn is directly stretched by dry heat, the stretching temperature is 120 ℃, and the stretching ratio is 4 times. The stretched fiber is extracted with 60 ℃ water, and then heat-set to obtain a The fast-oxidized polyacrylonitrile precursor has a strength of 3.7 cN / dtex and a cyclization degree of 30%. The PAN precursor was raised to 240°C at 4°C / min and kept at a constant temperature for 1.5h, and the cyclization reaction was basically over.
Example Embodiment
[0027] Example 2
[0028] The dried polyacrylonitrile and 1-butyl-3-methylimidazole chloride salt type ionic liquid are mixed uniformly at a ratio of 1:1.8, and the mixture is added to the twin screw and air is blown into the twin screw for spinning. The spinning temperature is 180°C, and its winding speed is 500m / min. The spun spun yarn is directly stretched by dry heat, the stretching temperature is 120 ℃, and the stretching ratio is 4 times. The stretched fiber is extracted with 60 ℃ water, and then heat-set to obtain a The fast-oxidized polyacrylonitrile precursor has a strength of 4.22 cN / dtex and a degree of cyclization of 25%. The PAN precursor was raised to 240°C at 4°C / min and kept at a constant temperature for 1 hour, and the cyclization reaction was basically over.
Example Embodiment
[0029] Example 3
[0030] The dried polyacrylonitrile and the chloride 1-methyl-3-ethylimidazole salt type ionic liquid are mixed uniformly at a ratio of 1:1, the mixture is added to the twin screw and air is blown into the twin screw for spinning , The spinning temperature is 220℃, and the winding speed is 600m / min. The spun spun spun yarn is directly stretched by dry heat with a stretching temperature of 180°C and a stretching ratio of 10 times. The stretched fiber is extracted with 80°C water and then heat-set to obtain a The fast-oxidized polyacrylonitrile precursor has a strength of 6.35 cN / dtex and a degree of cyclization of 42%. The PAN precursor was raised to 240°C at 4°C / min and kept at constant temperature for 0.5h, and the cyclization reaction was basically over.
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