Preparation method of double-layer composite nanofiltration membrane
A composite nanofiltration membrane and electric double layer technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Membrane stability and other issues to achieve the effect of reducing ineffective crosslinking, promoting uniform spreading, and improving water flux
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[0020] The preparation method of the electric double layer composite nanofiltration membrane of the present invention comprises the following steps:
[0021] The first step, base film pretreatment, soak the base film in deionized water to remove the protective agent on it, and finally store it in deionized water for future use;
[0022] The second step, amination of the base film, the base film treated in the first step is put into a polyhydroxyamine solution for amination, and then the excess polyhydroxyamine solution is washed with deionized water and stored in deionized water for later use;
[0023] The third step is to prepare the nanofiltration membrane by interfacial polymerization. 1) Water phase coating: use an air knife to purge the aminated base membrane in the second step to remove deionized water on the surface of the base membrane; then soak it In the piperazine solution, remove the excess aqueous phase solution on the surface of the base film by blowing with an a...
Embodiment 1 4
[0030] Soak the PVC base film in deionized water for 80h at room temperature to remove the protective agent on it; then use 20g / L glucosamine, meglumine, triethanolamine or diethanolamine solution at 70℃ The PVC base film was subjected to amination treatment for 60 min; the excess polyhydroxyamine solution was washed with deionized water and stored in deionized water for later use.
[0031] Aqueous coating: use an air knife to purge the aminated base film in the second step to remove the deionized water on the surface of the base film. It is immersed in piperazine solution, soaked for 5 minutes at room temperature, and then removed by air knife blowing to remove excess aqueous phase solution on the surface of the base film;
[0032] Organic phase coating: put the base film coated with the piperazine solution into the organic phase solution, take it out after the reaction, use an air knife to remove the excess organic phase solution on the surface of the base film, and store it...
Embodiment 5 7
[0038] Soak the PVC base film in deionized water for 90 hours at room temperature to remove the protective agent on it. Then use the meglumine solution with a weight concentration of 20g / L to treat the PVC base film at 50℃, 60℃ and 70℃ for 60min, then wash off the excess polyhydroxyamine solution with deionized water and store it in deionized water for later use .
[0039] Aqueous coating: use an air knife to purge the aminated base film in the second step to remove deionized water on the surface of the base film. The purging temperature is room temperature, and the humidity is controlled at 10 to 20% for 3 minutes; then It is immersed in piperazine solution, soaked for 3 minutes at room temperature, and then purged with an air knife to remove excess aqueous phase solution on the surface of the base film;
[0040] Coating with organic phase solution: put the base film coated with piperazine solution into the organic phase solution, take it out after the reaction, use an air k...
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