Method for preparing polyvinylidene-fluoride bilayer hollow fiber membrane
A polyvinylidene fluoride, double-layer hollow technology, applied in the field of membrane separation, can solve the problems of low flux of polyvinylidene fluoride separation membranes, achieve the effect of simple membrane production equipment and methods, increase flux, and increase porosity
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Embodiment 1
[0017] ① Preparation of casting solution, core solution and outer gel bath
[0018] The outer layer casting solution is made of polyvinylidene fluoride polymer, the solvent N-methylpyrrolidone and the additive polyethylene glycol according to the weight percentage of 10%, 78% and 12% and mixed uniformly at 70°C; the inner layer casting solution Polyvinylidene fluoride polymer, solvent N-methylpyrrolidone and additive polyvinyl alcohol are mixed uniformly at 70°C by weight percentage of 14.25%, 85% and 0.75%; the composition of the core liquid is water; the composition of the gel bath composed of water.
[0019] ②Spinning of hollow fiber membrane
[0020] The casting liquid flows out from the outer hole of the spinneret, and the core liquid flows out from the inner hole of the spinneret at the same time, and the flow rate of the inner and outer casting liquid is 6ml / min and 2ml / min respectively, and the flow rate of the core liquid is 2.5ml / min; After passing through the air ...
Embodiment 2
[0025] Preparation of casting solution, core solution and outer gel bath
[0026] The outer film casting solution is made of polyvinylidene fluoride polymer, the solvent N-methylpyrrolidone and the additive polyvinyl pyrrolidone according to the weight percentage of 10%, 78% and 12%, and mixed uniformly at 70°C; the inner film casting solution is made of The polyvinylidene fluoride polymer, the solvent N-methylpyrrolidone and the additive polyvinyl alcohol are mixed uniformly at 70°C at 14.25%, 85%, and 0.75% by weight; the composition of the core liquid is water; the composition of the gel bath for water.
[0027] ②Spinning of hollow fiber membrane
[0028] The casting liquid flows out from the outer hole of the spinneret, and the core liquid flows out from the inner hole of the spinneret at the same time, and the flow rate of the inner and outer casting liquid is 6ml / min and 2ml / min respectively, and the flow rate of the core liquid is 2.5ml / min; After passing through th...
Embodiment 3
[0033] Preparation of casting solution, core solution and outer gel bath
[0034] The outer film casting solution is made of polyvinylidene fluoride polymer, the solvent N-methylpyrrolidone and the additive polyvinyl pyrrolidone according to the weight percentage of 10%, 78% and 12%, and mixed uniformly at 70°C; the inner film casting solution is made of The polyvinylidene fluoride polymer, the solvent N-methylpyrrolidone and the additive polyvinyl alcohol are mixed uniformly at 70 ° C by weight percentage of 13.5%, 85% and 1.5%; the composition of the core liquid is water; the composition of the gel bath for water.
[0035] ②Spinning of hollow fiber membrane
[0036] The casting liquid flows out from the outer hole of the spinneret, and the core liquid flows out from the inner hole of the spinneret at the same time, and the flow rate of the inner and outer casting liquid is 6ml / min and 2ml / min respectively, and the flow rate of the core liquid is 2.5ml / min; After passing ...
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