Preparation method of high-strength alkali-resistant polyacrylonitrile fiber and polyacrylonitrile fiber
A polyacrylonitrile fiber, polyacrylonitrile spinning technology, applied in the chemical characteristics of fibers, wet spinning, drawing spinning and other directions, can solve the problems of low fiber strength, poor alkali resistance, etc., and achieve high performance and alkali resistance. Good properties, improved crystallinity and orientation
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Embodiment 1
[0034]1. Coagulation and drafting: batch copolymerization is adopted, and the spinning stock solution is obtained after the polymerization stock solution undergoes single removal, aging and defoaming. The mass content of acrylonitrile in the stock solution copolymer is 99.2%, and the solid content is 21.5%; the spinning stock solution is passed through The primary fiber is prepared by wet spinning after accurate metering by the metering pump. The diameter of the spinneret is 65 μm, the number of spinneret holes is 24,000, the aspect ratio is 1.75, and the first coagulation bath is dimethyl sulfoxide aqueous solution with a concentration of 50%. , the temperature is 35°C, and the draw ratio is 0.6; the second coagulation bath and the third coagulation draw ratio are 1.12 and 1.15, respectively.
[0035] 2. Water washing, hot water drawing and one-time oiling: use 3-level hot water drawing, drawing temperature is 80, 90, 95 ℃, drawing ratio is 1.8, 2.0, 2.2 respectively; washing ...
Embodiment 2
[0041] 1. Coagulation and drawing: Batch copolymerization is adopted, and the spinning stock solution is obtained after the polymerization stock solution undergoes single removal, aging, and defoaming. The mass content of acrylonitrile in the stock solution copolymer is 99.8%, and the solid content is 21.5%; the spinning stock solution is passed through The primary fiber is prepared by wet spinning after accurate metering by the metering pump. The diameter of the spinneret is 65 μm, the number of spinneret holes is 24,000, the aspect ratio is 1.75, and the first coagulation bath is dimethyl sulfoxide aqueous solution with a concentration of 50%. , the temperature is 35°C, and the draw ratio is 0.6; the second coagulation bath and the third coagulation draw ratio are 1.12 and 1.15, respectively.
[0042] 2. Water washing, hot water drawing and one-time oiling: use 3-level hot water drawing, drawing temperature is 80, 90, 95 ℃, drawing ratio is 1.8, 2.0, 2.2 respectively; washing...
Embodiment 3
[0048] 1. Coagulation and drafting: batch copolymerization is adopted, and the spinning dope is obtained after the polymerization stock solution undergoes singulation removal, aging, and defoaming. The mass content of acrylonitrile in the stock solution copolymer is 99.4%, and the solid content is 21.5%; the spinning solution is passed through The primary fiber is prepared by wet spinning after accurate metering by the metering pump. The diameter of the spinneret is 65 μm, the number of spinneret holes is 24,000, the aspect ratio is 1.75, and the first coagulation bath is dimethyl sulfoxide aqueous solution with a concentration of 50%. , the temperature is 35°C, and the draw ratio is 0.6; the second coagulation bath and the third coagulation draw ratio are 1.12 and 1.15, respectively.
[0049] 2. Water washing, hot water drawing and one-time oiling: use 3-level hot water drawing, drawing temperature is 80, 90, 95 ℃, drawing ratio is 1.8, 2.0, 2.2 respectively; washing temperatu...
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