Nanofiltration membrane and preparation method of nanofiltration membrane
A nanofiltration membrane and membrane surface technology, which is applied in the field of preparation of nanofiltration membranes and nanofiltration membranes, can solve the problems of cumbersome preparation process and insufficient stability of nanofiltration membranes, achieve simple preparation process, improve anti-pollution performance, reduce The effect of adhesion
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[0040] The invention discloses a preparation method of a nanofiltration membrane, wherein the nanofiltration membrane comprises an original polymer membrane and a tannic acid layer and a polyetheramine layer formed on the surface of the original polymer membrane, and the preparation method of the nanofiltration membrane specifically includes The following steps:
[0041] S1: Weigh at least one of the polymer polyacrylonitrile (PAN), polyethersulfone (PES), polysulfone (Psf) and polyimide (PI), and weigh the solvent N-methylpyrrolidone (NMP) , at least one of dimethylsulfoxide (DMSO) and N,N-dimethylformamide (DMF), and then formulated into a polymer solution with a mass fraction of 16-20%;
[0042] S2: Add a porogen to the above polymer solution, and stir until completely dissolved to obtain a casting solution; wherein, the porogen is polypyrrolidone (PVP), polyethylene glycol 400 (PEG-400) and polyethylene glycol At least one of alcohol 800 (PEG-800), the mass fraction of th...
Embodiment 1
[0051] A preparation method of a nanofiltration membrane, specifically comprising the following steps:
[0052] S1: Weigh polyacrylonitrile raw materials and N-methylpyrrolidone (NMP), and prepare a polyacrylonitrile N-pyrrolidone solution with a mass fraction of 19%;
[0053] S2: Add 1% polyethylene glycol 800 (PEG-800) to the N-pyrrolidone solution of polyacrylonitrile, and stir and mix until completely dissolved to obtain a casting solution;
[0054] S3: The above-mentioned casting solution is prepared by using the immersion precipitation phase inversion method to prepare the membrane, and the prepared membrane is washed with deionized water for several times to obtain the original polymer membrane;
[0055] S4: preparing a phosphate buffer solution with a pH value of 8;
[0056] S5: dissolving tannic acid in the above buffer solution to prepare a tannic acid solution with a concentration of 0.3 g / L;
[0057] S6: Dissolving polyetheramine 500 in the above buffer solution ...
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