Polyamide composite nanofiltration membrane and preparation method thereof
A composite nanofiltration membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of not too high rejection rate, low water flux, low rejection rate, etc., and achieve improvement The effect of interception rate, short process flow and good application prospect
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[0029]Example 1:
[0030]A polyamide composite nanofiltration membrane, comprising a supporting base layer and a polyamide functional layer obtained by interfacial polymerization on the supporting base layer, the polyamide functional layer comprising the following raw material components: diamine, inorganic salt, organic acid , Polyacid chloride, oil phase solvent and deionized water, the diamine is piperazine, and the polyacid chloride is trimesoyl chloride.
[0031]The inorganic salt is lithium chloride.
[0032]The organic acid is citric acid.
[0033]The oil phase solvent is n-hexane.
[0034]The support base layer is a polysulfone porous support layer. The specific preparation process is as follows: weigh 75g of polysulfone resin (PSF), 375g of N-methylpyrrolidone (NMP), 50g of polyethylene glycol 200 (PEG200), and mix to prepare 500g The solution was stirred at 70°C for 6 hours to prepare a uniformly dispersed film casting solution. After the casting liquid is filtered and vacuum degassed, i...
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[0045]Example 2:
[0046]The difference from Example 1 is that the mass percentage of lithium chloride is 0.6 wt%.
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[0047]Example 3:
[0048]The difference from Example 1 is that the mass percentage of lithium chloride is 1 wt%.
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