Manufacturing method of polyacrylonitrile-based carbon fiber precursor
A technology of polyacrylonitrile-based carbon fiber and manufacturing method, which is applied in the field of preparing polyacrylonitrile-based carbon fiber precursors by wet spinning, and can solve the problems of poor mechanical properties of carbon fibers and easy generation of wool from precursors
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Embodiment 1
[0026] 1. Coagulation and drawing: Wet spinning is used to prepare primary fibers. The intrinsic viscosity of the stock solution used is 1.75dL / g, and the solid content of the spinning stock solution is 22%. , the spinneret hole diameter is 60 μm, the number of spinneret holes is 12000, the coagulation temperature is 25° C., the concentration is 50%, followed by two-stage coagulation and drawing, and the drawing ratio is 1.0 and 1.05 respectively to obtain coagulated fibers.
[0027] 2. Hot water drawing, water washing and oiling, low-temperature drying and drying densification: use 3-level hot water drawing, the drawing temperature is 90, 98, 99 ℃, and the drawing ratio is 1.8, 2.0, 2.4; water washing The temperature is 60°C, the draft ratio is 1.0; the oiling temperature is 35°C; the low temperature drying and densification temperature is 88°C.
[0028] 3. High-temperature drying and densification: the final drying and densification temperature is 135°C, the tension on each ...
Embodiment 2
[0035] 1. Coagulation and drafting: The primary fiber is prepared by wet spinning. The intrinsic viscosity of the stock solution used is 1.75dL / g, and the solid content of the spinning stock solution is 22%. The spinning stock solution is accurately metered by a metering pump and filtered again before spinning. The diameter of the spinneret is 60 μm, the number of spinneret holes is 12,000, the coagulation temperature is 25°C, and the concentration is 50%, followed by two-stage coagulation and drawing, and the drawing ratio is 1.0 and 1.05, respectively, to obtain coagulated fibers.
[0036] 2. Hot water drawing, water washing and oiling, low-temperature drying and drying densification: use 3-level hot water drawing, the drawing temperature is 90, 98, 99 ℃, and the drawing ratio is 1.8, 2.0, 2.4; water washing The temperature is 60°C, the draft ratio is 1.0; the oiling temperature is 35°C; the low temperature drying and densification temperature is 88°C.
[0037] 3. High-tempe...
Embodiment 3
[0044] 1. Coagulation and drafting: The primary fiber is prepared by wet spinning. The intrinsic viscosity of the stock solution used is 1.75dL / g, and the solid content of the spinning stock solution is 22%. The spinning stock solution is accurately metered by a metering pump and filtered again before spinning. The diameter of the spinneret is 60 μm, the number of spinneret holes is 12,000, the coagulation temperature is 25°C, and the concentration is 50%, followed by two-stage coagulation and drawing, and the drawing ratio is 1.0 and 1.05, respectively, to obtain coagulated fibers.
[0045] 2. Hot water drawing, water washing and oiling, low-temperature drying and drying densification: use 3-level hot water drawing, the drawing temperature is 90, 98, 99 ℃, and the drawing ratio is 1.8, 2.0, 2.4; water washing The temperature is 60°C, the draft ratio is 1.0; the oiling temperature is 35°C; the low temperature drying and densification temperature is 88°C.
[0046] 3. High-tempe...
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