A kind of preparation method of hollow fiber nanofiltration membrane
A nanofiltration membrane and fiber membrane technology is applied in the preparation of hollow fiber nanofiltration membranes, whisker blending and immobilization to prepare hollow fiber nanofiltration membranes, and can solve the problem of low mechanical strength, large deformability, and easy falling off of functional layers. and other problems, to achieve the effect of high retention rate and increased hydrophilicity
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Embodiment 1
[0025] Add silicon carbide with a concentration of 1wt% into the polymer casting solution, dissolve and defoam, and obtain a casting solution containing whiskers; squeeze the casting solution and core solution containing whiskers from the nozzle of the spinneret at the same time After passing through a 10cm air bath, enter the coagulation bath, stay in the coagulation bath for 20s to separate the phases of the polymer, remove the membrane filament from the godet wheel, wash it with deionized water for many times, and soak it in deionized water for 48 hours, and then the hollow fiber is obtained. Ultrafiltration membrane; pre-coat the aqueous solution containing 5wt% ionic liquid and 1wt% PVA on the inner surface of the hollow fiber ultrafiltration membrane, after drying, apply the n-hexane solution of piperazine aqueous solution and then coat trimesoyl chloride to obtain Hollow fiber nanofiltration membrane.
Embodiment 2
[0027] Add silicon carbide with a concentration of 5wt% into the polymer casting solution, and after dissolving and defoaming, a casting solution containing whiskers is obtained; the casting solution and core solution containing whiskers are squeezed from the nozzle of the spinneret at the same time After passing through the 20cm air bath, enter the coagulation bath, stay in the coagulation bath for 10s to separate the phases of the polymer, remove the membrane filament from the godet wheel, rinse it with deionized water for many times, and soak in deionized water for 48 hours, and then obtain the hollow fiber Ultrafiltration membrane; pre-coat the aqueous solution containing 10wt% ionic liquid and 5wt% PVA on the inner surface of the hollow fiber ultrafiltration membrane, after drying, apply the n-hexane solution of piperazine aqueous solution and then coat trimesoyl chloride to obtain Hollow fiber nanofiltration membrane.
Embodiment 3
[0029] Add silicon carbide with a concentration of 12wt% into the polymer casting solution, dissolve and defoam, and obtain a casting solution containing whiskers; squeeze the whisker-containing casting solution and core solution through the nozzle of the spinneret at the same time After passing through the 5cm air bath, enter the coagulation bath, stay in the coagulation bath for 5s to separate the polymer phase, remove the membrane filament from the godet wheel, wash it with deionized water for many times and soak it in deionized water for 48h, and then obtain the hollow fiber Ultrafiltration membrane; pre-coat the aqueous solution containing 5wt% ionic liquid and 10wt% PVA on the inner surface of the hollow fiber ultrafiltration membrane, after drying, apply the n-hexane solution of piperazine aqueous solution and then coat trimesoyl chloride to obtain Hollow fiber nanofiltration membrane.
[0030] Control group 1
[0031] The polymer casting liquid and the core liquid are...
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