Hydrophilic modification method of ultrafiltration membrane
A hydrophilic modification and ultrafiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of difficult selection of grafted monomers, difficulty in maintaining hydrophilicity, and harsh reaction conditions and other problems, to achieve excellent separation performance, convenient operation, and stable hydrophilicity
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Example Embodiment
[0025] Example 1: Preparation of PVA hydrophilic modified ultrafiltration membrane (PES base membrane) with a deposition amount m of 0.4
[0026] Select polyethersulfone (PES) ultrafiltration membrane as the bottom membrane, with a membrane area of 25cm 2 , Mix 50ml of PVA aqueous solution with a concentration of 0.2μg / ml and 25ml of 1.5% glutaraldehyde and transport them to the filter tank (the concentration of curing agent in the mixed solution is 0.5%), and deposit PVA on the pressure of 0.1MPa On PES base film; curing at 20℃ for 30min;
[0027] The pure water flux of the modified ultrafiltration membrane is 187.2L / hr.m 2 (25℃, 0.1MPa); the contact angle of the membrane surface is 22 degrees; the stable flux of the 3000ppm oil-water emulsion filtration test is 110L / hr.m 2 After several oil-water emulsion filtration tests and cleaning, the pure water flux can still be restored to more than 90% of the original pure water flux.
Example Embodiment
[0028] Example 2: Preparation of PVA hydrophilic modified ultrafiltration membrane (PES base membrane) with a deposition amount m of 2
[0029] (1) Select polyethersulfone (PES) ultrafiltration membrane as the bottom membrane, with a membrane area of 25cm 2 , Mix 50ml of PVA aqueous solution with a concentration of 1μg / ml and 25ml of 3% glutaraldehyde and transport it to the filter tank (the concentration of curing agent in the mixed solution is 1%), and deposit on PES ultrafiltration under 0.1MPa pressure On the bottom film; curing at 40℃ for 20min;
[0030] The pure water flux of the modified ultrafiltration membrane is 156.8L / hr.m 2 (25℃, 0.1MPa); the contact angle of the membrane surface is 18 degrees; the stable flux of 3000ppm oil-water emulsion filtration test is 100L / hr.m 2 After several oil-water emulsion filtration tests and cleaning, the pure water flux can still be restored to more than 95% of the original pure water flux.
Example Embodiment
[0031] Example 3: Preparation of PVA hydrophilic modified ultrafiltration membrane (PES base membrane) with a deposition amount m of 8
[0032] (1) Select polyethersulfone (PES) ultrafiltration membrane as the bottom membrane, with a membrane area of 25cm 2 , Mix 50ml of PVA aqueous solution with a concentration of 4μg / ml and 25ml of 6% glutaraldehyde and transport them to the filter tank (the concentration of curing agent in the mixture is 2%), and then transport them to the filter tank after mixing. Deposited on the bottom PES ultrafiltration membrane under 0.1MPa air pressure; cured for 10min at 40℃;
[0033] The pure water flux of the modified ultrafiltration membrane is 149.8L / hr.m 2 (25℃, 0.1MPa); the contact angle of the membrane surface is 18 degrees; the stable permeability of 3000ppm oil-water emulsion filtration test is 95L / hr.m 2 After several oil-water emulsion filtration tests and cleaning, the pure water flux can still be restored to more than 95% of the original pu...
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