Preparation method of composite nanofiltration membrane and composite nanofiltration membrane prepared by the method
A technology of composite nanofiltration membrane and base membrane, which is applied in chemical instruments and methods, membranes, membrane technology, etc., and can solve problems such as application limitations
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[0029] see figure 1 , the preparation method of the composite nanofiltration membrane of an embodiment, comprises the steps:
[0030] S110, fix the clean base film on the substrate, uniformly dip-coat the polyethylene glycol polyelectrolyte aqueous solution on the surface of the base film with a glass rod, and obtain a base film coated with polyethylene glycol polyelectrolyte after drying.
[0031] Wherein, the base membrane is a polymer ultrafiltration membrane. Specifically, the base membrane is a polymer ultrafiltration membrane with a molecular weight cut-off of 10,000-30,000 Da. The polymer ultrafiltration membrane can be polyacrylonitrile (PAN), sulfonated polysulfone (SPSF), polyethersulfone (PES), sulfonated polyethersulfone (SPES) and other ultrafiltration membranes. The ultrafiltration basement membrane is rinsed in deionized water for 1-2 minutes, and then dried in the shade to obtain a clean basement membrane.
[0032] The preparation method of the polyethylene ...
Embodiment 1
[0058] Soak the polysulfone ultrafiltration membrane with a molecular weight cut-off of 10,000-30,000Da in deionized water overnight, rinse for 2 minutes, then dry in the shade and set aside.
[0059] Polyethylene glycol sulfate and lithium chloride are dissolved in water to obtain an active layer casting solution. Wherein, the mass concentration of polyethylene glycol sulfate is 2%, and the mass concentration of lithium chloride is 0.2%.
[0060] Fix the shade-dried base film on a smooth and clean glass plate, flatten the polyethylene glycol sulfate aqueous solution with a smooth glass rod, make it evenly dip-coated on the base film surface, and then place it in a clean room to dry, or place it at 50 Dry in an oven at °C.
[0061] An aqueous solution of glutaraldehyde with a volume concentration of 2.0% was poured on the surface of the basement film, overflowing the excess solution, and then thermally crosslinked at 50° C. for 1 hour. After thermal crosslinking, the surface...
Embodiment 2
[0064] Rinse the polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of 10,000 Da soaked in deionized water overnight in deionized water for 2 minutes, then dry it in the shade, and set it aside.
[0065] Polyethylene glycol phosphate and glycerin are dissolved in water to obtain an active layer casting solution. Wherein, the mass concentration of polyethylene glycol phosphate is 2%, and the mass concentration of glycerin is 20%.
[0066] Fix the shade-dried base film on a smooth and clean glass plate, flatten the aqueous solution of polyethylene glycol phosphate with a smooth glass rod, make it evenly dip-coated on the surface of the base film, and place it in an oven at 50°C for 1 hour.
[0067] An aqueous solution of maleic acid with a volume concentration of 10% was poured on the surface of the basement film, overflowing the excess solution, and then thermally crosslinked at 90° C. for 1 hour. After thermal crosslinking, the surface of the basement ...
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