Polyvinylidene fluoride hollow fiber membrane and preparation method thereof
The technology of polyvinylidene fluoride and polyvinylidene fluoride resin is applied in the field of polyvinylidene fluoride hollow fiber membrane and its preparation, which can solve the problem that the hydrophilicity cannot be maintained for a long time, and the separation index of separation membrane strength, permeation amount and retention rate is affected. drop and other problems, to achieve good mechanical and chemical stability, reduce irreversible deposition, and improve the effect of anti-pollution performance
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Embodiment 1
[0039] Nano-silica 0.5wt%, Tween-800.5wt%, N, N-dimethylacetamide 20wt%, after high-speed mechanical stirring dispersion and ultrasonic dispersion alternately, and polyvinylidene fluoride resin 20wt%, all Add 2wt% of fluorosulfonic acid resin, 5wt% of polyvinylpyrrolidone (K-30), 3wt% of ethanol, and 49wt% of N,N-dimethylacetamide into a sealed stirring tank, stir and dissolve at 85°C to form a homogeneous solution. After heat preservation at 70°C and vacuum defoaming, it is extruded through a tubular hollow fiber spinneret at the same time as the 5% dimethylacetamide aqueous solution as the internal coagulation liquid, and passes through a distance of 15 cm in the air, and enters the In the coagulation bath of the coagulation solution, the winding becomes a polyvinylidene fluoride-based film after being treated with alcohol. Then immerse the polyvinylidene fluoride-based film in 50°C, 5wt% sodium hydroxide aqueous solution for 4 hours, take it out and wash it, and immerse it ...
Embodiment 2
[0041] Nano silicon dioxide 0.5wt%, Tween-800.5wt%, N, N-dimethylacetamide 20wt%, through high-speed mechanical stirring dispersion and ultrasonic dispersion alternately, and polyvinylidene fluoride resin 18wt%, polyvinylidene fluoride resin Add vinylpyrrolidone (K-30) 6wt%, polyethylene glycol-4005wt%, N, N-dimethylformamide 20%, N, N-dimethylacetamide 30wt% into a sealed stirring tank, at 85°C Stir under low temperature to dissolve into a uniform solution. After heat preservation at 70°C and vacuum defoaming, pass through a tubular hollow fiber spinneret and extrude simultaneously with a 5% dimethylacetamide aqueous solution as an internal coagulation liquid. centimeter distance, enter the coagulation bath with water as the external coagulation liquid, and become polyvinylidene fluoride-based film after being wound up and treated with alcohol. Then immerse the polyvinylidene fluoride-based film in 50°C, 5wt% sodium hydroxide aqueous solution for 4 hours, take it out and wash...
Embodiment 3
[0043] Polyvinylidene fluoride resin 15wt%, polymethyl methacrylate-vinyl alcohol 10wt%, polyethylene glycol-400 10wt%, Tween-800.5wt%, N,N-dimethylformamide 30%, N, Add 31wt% of N-dimethylacetamide and 0.5wt% of coupling agent KH56 into a sealed stirring tank, stir and dissolve at 85°C to form a homogeneous solution A; mix 1wt% ethyl orthosilicate and 2wt% ethanol to prepare Solution B: add solution B to solution A under stirring, adjust the pH value to about 3 with acid, and react for 2 hours. After heat preservation at 70°C and vacuum defoaming, it is extruded simultaneously with 5% dimethylacetamide aqueous solution as the internal coagulation liquid through a tubular hollow fiber spinneret, passes through a distance of 20 cm in the air, and enters the In the coagulation bath of the external coagulation solution, the winding becomes a polyvinylidene fluoride base film after being treated with alcohol. Then immerse the polyvinylidene fluoride-based film in 50°C, 5wt% sodiu...
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