Composite nanofiltration membrane and preparation method thereof
A composite nanofiltration membrane and base membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of low water flux of acid-resistant nanofiltration membranes, increase hydrophilicity and charge density, solve the Poor acid resistance
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[0046] (1) Preparation of polysulfone-based membrane
[0047] (1) Weighing 18wt% polysulfone, 72wt% N, N-dimethylacetamide, 10wt% polyethylene glycol with a molecular weight of 800;
[0048] (2) Add polysulfone to N,N-dimethylacetamide at 110°C, stir for 8 hours until the solution is clear; then add polyethylene glycol, stir at 50°C for 8 hours to form a casting solution;
[0049] (3) filter casting solution;
[0050] (4) Vacuum defoaming treatment of the filtered casting solution at 30° C. for 24 hours;
[0051] (5) On the film coating machine, the casting solution and polyester non-woven fabric are made into a membrane, and the membrane is placed in the air with a temperature of 25-30 ° C and a humidity of 70-80% for 2-3 minutes, and then Transfer to a deionized water coagulation bath for solidification, and soak in deionized water to obtain a polysulfone ultrafiltration membrane.
[0052] (2) Preparation of composite nanofiltration membrane
[0053] The prepared composi...
Embodiment 1
[0062] (1) 0.25g piperazine, 0.1g sodium dodecylsulfonate and 0.075g triethylamine are mixed with 100g deionized water to obtain an aqueous phase solution;
[0063] (2) Mix 0.15g 1,3,6-naphthalenetrisulfonyl chloride, 0.005g chlorinated anhydride and 100g Isopar G to obtain an oil phase solution;
[0064] (3) providing a polysulfone ultrafiltration base membrane with a molecular weight cut-off of 50,000 Da, immersing the base membrane in an aqueous phase solution to obtain a coated base membrane;
[0065] (4) The base film coated in step (3) was taken out after 5 minutes and dried at 30°C for 5 minutes, then immersed in the oil phase solution, taken out after 2 minutes and dried at 120°C for 5 minutes to obtain a composite nano filter membrane.
[0066] Test results: the obtained composite nanofiltration membrane was placed in 10wt% H 2 SO 4 Soaked in the aqueous solution for 10 hours, tested under the conditions of temperature 25°C and pressure 0.5Mpa, the pure water flux ...
Embodiment 2
[0068] (1) 1g piperazine is mixed with 100g deionized water to obtain an aqueous phase solution;
[0069] (2) Mix 0.25g of 1,3,6-naphthalenetrisulfonyl chloride, 0.015g of chlorinated anhydride and 100g of cyclohexane to obtain an oil phase solution;
[0070] (3) providing a polysulfone base membrane with a molecular weight cut-off of 50,000 Da, immersing the base membrane in an aqueous phase solution to obtain a coated base membrane;
[0071] (4) Take out the base film coated in step (3) after 5 minutes and dry it at 30°C for 5 minutes and then immerse it in the oil phase solution, take it out after 1 minute and dry it at 100°C for 10 minutes to obtain a composite nano filter membrane.
[0072] Test results: the obtained composite nanofiltration membrane was placed in 10wt% H 2 SO 4 Soaked in the aqueous solution for 10 hours, tested under the conditions of temperature 25°C and pressure 0.5Mpa, the pure water flux is 26L / m 2 h, the desalination rate is 80%.
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