Large-flux anti-fouling polyvinylidene fluoride hollow fiber microfiltration membrane and preparation method thereof
A polyvinylidene fluoride, high-flux technology, applied in the field of membrane separation, can solve the problem of inability to meet the requirements of use, and achieve the effects of excellent chemical resistance, good anti-fouling, and good membrane performance and structure
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Embodiment 1
[0031] Mix 8% polyvinylidene fluoride, 82% organic solvent, 4% organic additive, and 6% hydrophilic additive, stir for 6 hours, homogenize and dissolve at 50°C to make a casting solution, and vacuum defoam at room temperature for 6 hours, using the phase inversion method, the conditions are: the air dry distance is 5 cm, the nitrogen pressure is 0.3 Mpa, the spinning speed is 6 m / min; the coagulation bath is deionized water with a water temperature of 20 ° C, and the core liquid is any solution; The reaction temperature was 20°C, and the humidity was 40%, to prepare a large-flux antifouling polyvinylidene fluoride hollow fiber microfiltration membrane. It has been determined that the flux of pure water at 0.1 Mpa and 25°C is 1150 L / (m 2 h).
Embodiment 2
[0033] Mix 10% polyvinylidene fluoride, 80% organic solvent, 6% organic additive, and 4% hydrophilic additive, stir for 10 hours, homogenize and dissolve at 45°C to make a casting solution, and vacuum defoam at room temperature for 8 hours, using the phase inversion method, the conditions are: the air dry distance is 10 cm, the nitrogen pressure is 0.3 Mpa, the spinning speed is 12 m / min; the coagulation bath is deionized water with a water temperature of 40 °C, and the core liquid is any solution; The reaction temperature is 40°C, and the humidity is 80%, and a large-flux antifouling polyvinylidene fluoride hollow fiber microfiltration membrane is prepared. It has been determined that the flux of pure water at 0.1 Mpa and 25°C is 1250 L / (m 2 h).
Embodiment 3
[0035] Mix 12% polyvinylidene fluoride, 78% organic solvent, 7% organic additive, and 3% hydrophilic additive, stir for 12 hours, homogenize and dissolve at 55°C to make a casting solution, and vacuum defoam at room temperature for 8 hours, using the phase inversion method, the conditions are: the air dry distance is 8 cm, the nitrogen pressure is 0.3 Mpa, the spinning speed is 12 m / min; the coagulation bath is deionized water with a water temperature of 30 °C, and the core liquid is any solution; The temperature is 30°C and the humidity is 60%, and a large-flux antifouling polyvinylidene fluoride hollow fiber microfiltration membrane is prepared. It has been determined that the flux of pure water at 0.1 Mpa and 25°C is 1580 L / (m 2 h).
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