High tensile strength PVDF hollow fiber membrane preparation method
A high tensile strength, fiber membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as high cost, difficult process, complex preparation process, etc.
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Embodiment 1
[0024] Preparation of casting solution: Weigh 12% PVDF resin (intrinsic viscosity is 3.87dL / g, weight average molecular weight is about 2 million), 81% N,N-dimethylacetamide, 5% poly Vinylpyrrolidone, 1% ethanol and 1% acetone are mixed, stirred and heated to 90°C to fully dissolve to prepare a homogeneous casting solution.
[0025] Membrane preparation: transfer the casting solution to the feed liquid tank of the spinning machine, and let it stand until air bubbles are removed. Set the temperature of feed liquid tank and metering pump to 90°C, heat and keep the temperature constant. Simultaneously, pressurize the feed liquid by pouring nitrogen into it to reach a pressure of 1.5MPa. The core liquid is 10% N,N-dimethylacetamide aqueous solution, and the temperature of the core liquid is 40°C. Adjust the flow rate of the core liquid to 8mL / min, and the pulling speed of the winding roller to 10m / min. After the operation is stable, open the feed liquid valve, and the filament ...
Embodiment 2
[0028] Preparation of casting solution: take 13% by weight of PVDF (intrinsic viscosity is 3.87dL / g, weight average molecular weight is about 2 million) resin, 80% N,N-dimethylacetamide, 5% polyethylene pyrrolidone, 1% ethanol and 1% acetone. Stir and heat to 90°C to fully dissolve.
[0029] Membrane preparation: transfer the casting solution to the feed liquid tank of the spinning machine, and let it stand until air bubbles are removed. Set the temperature of feed liquid tank and metering pump to 90°C, heat and keep the temperature constant. Simultaneously, pressurize the feed liquid by pouring nitrogen into it to reach a pressure of 1.8MPa. The core liquid is 10% N,N-dimethylacetamide aqueous solution, and the temperature of the core liquid is 40°C. Adjust the flow rate of the core liquid to 9mL / min, and the pulling speed of the winding roller to 12m / min. After the operation is stable, open the feed liquid valve, and the filament comes out of the die and enters the coagu...
Embodiment 3
[0032] Preparation of casting solution: get 16% PVDF (intrinsic viscosity is 3.87dL / g, weight average molecular weight is about 2 million) resin, 70% N-methylpyrrolidone, 8% N,N -Dimethylacetamide, 5% polyvinylpyrrolidone, 1% ethylene glycol. Stir and heat to 90°C to fully dissolve.
[0033] Membrane preparation: transfer the casting solution to the feed liquid tank of the spinning machine, and let it stand until air bubbles are removed. Set the temperature of feed liquid tank and metering pump to 90°C, heat and keep the temperature constant. Simultaneously, pressurize the feed liquid by pouring nitrogen into it to reach a pressure of 2.3MPa. The core liquid is 10% N,N-dimethylacetamide aqueous solution, and the temperature of the core liquid is 40°C. Adjust the flow rate of the core liquid to 10mL / min, and the pulling speed of the winding roller to 14m / min. After the operation is stable, open the feed liquid valve, and the filament comes out of the die and enters the coag...
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