Polymer microfiltration membrane with micro-nano composite network pore structure as well as preparation method and application of polymer microfiltration membrane
A micro-nano composite and polymer technology, applied in the field of membrane separation, can solve the problems of narrow application range, high salinity wastewater, complex preparation process, etc. Simple process effect
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Embodiment 1
[0050] Dissolve 8g of polyacrylonitrile and 8g of polyvinylpyrrolidone in 84g of N,N-dimethylformamide (DMF); heat and stir evenly at 50°C, vacuumize and defoam; then coat it on non-woven fabric , the thickness of the coating is controlled to 100 μm, and then stay in the droplet bath obtained by ultrasonic atomization of deionized water for 30s; then the above film is immersed in a coagulation bath of deionized water for complete phase separation; after washing with water, a separation membrane is obtained. surface topography see figure 1 with figure 2 . Wherein, the average pore diameter of the separation membrane is 0.8 μm, and the size of the protrusions distributed on the skeleton is 50-250 nm.
Embodiment 2
[0052] Dissolve 12g of sulfonated polyethersulfone and 1g of polyethylene glycol in 87g of N-methyl-2-pyrrolidone (NMP); heat and stir evenly at 60°C, vacuumize and defoam; then apply it on a clean On the glass plate, the thickness of the coating is controlled to be 300 μm, and then stay in the droplet bath obtained by deionized water ultrasonic atomization for 10 seconds; then the above film is immersed in the deionized water coagulation bath to completely separate phases; after washing with water, the separation membrane is obtained . Wherein, the average pore diameter of the separation membrane is 0.3 μm, and the size of the protrusions distributed on the skeleton is 40-300 nm.
Embodiment 3
[0054] Dissolve 8g of polyethersulfone and 2g of polyvinyl alcohol in 90g of dimethyl sulfoxide (DMSO); after heating and stirring at 60°C, vacuumize and defoam; then coat it on a non-woven fabric. The thickness is controlled to be 150 μm, and then stay in the deionized water droplet bath obtained by high-pressure airflow atomization for 2 minutes; then the above-mentioned film is immersed in the deionized water coagulation bath for complete phase separation; after washing with water, the separation membrane is obtained. Wherein, the average pore diameter of the separation membrane is 4 μm, and the size of the protrusions distributed on the skeleton is 20-50 nm.
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