Cross-linked zwitterionic group-modified forward osmosis membrane and preparation method thereof
A zwitterion, forward osmosis membrane technology, applied in the field of membrane separation, can solve the problems of poor controllability, poor solubility, difficult film formation, etc., to achieve large-scale development and production, high production efficiency, improved stability and The effect of durability
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[0025] As an aspect of the technical solution of the present invention, it relates to a method for preparing a cross-linked zwitterionic group-modified forward osmosis membrane, which includes:
[0026] Provide a mixed reaction system comprising at least a polymer, a zwitterionic precursor containing a tertiary amine group, a hydrophilic monomer, an initiator and a solvent;
[0027] heating the mixed reaction system to cause free radical copolymerization of the zwitterionic precursor containing tertiary amine groups and hydrophilic monomers to form a random copolymer comprising zwitterionic polymers and hydrophilic polymers , to obtain a film-making solution;
[0028] The membrane-forming solution is prepared into a membrane, which is immersed in a coagulation bath and then in a cross-linking bath to obtain a forward osmosis membrane modified with cross-linked zwitterionic groups.
[0029] In some embodiments, the preparation method may include:
[0030] Provide a mixed reac...
Embodiment 1
[0067] (1) 4 grams of polysulfone, 25 grams of dimethylaminoethyl methacrylate, 2 grams of acrylic acid, 2 grams of azobisisobutyronitrile and 77 grams of N-methylpyrrolidone were added to the reactor, and argon was passed through for a continuous period of time. Stir until it is completely dissolved, and after forming a uniform and transparent mixed solution, the temperature is rapidly raised to 120 ° C, and dimethylaminoethyl methacrylate and acrylic acid undergo radical copolymerization reaction, and the polymerization time is 0.2 hours to obtain a film-forming solution;
[0068] (2) The film-forming solution was applied to the non-woven fabric, and quickly immersed in a coagulation bath composed of 5 grams of 1,3-propane sultone and 95 grams of water at 0°C, so that the tertiary amine groups reacted to generate zwitterions group to obtain a forward osmosis membrane modified with zwitterionic groups;
[0069] (3) The zwitterionic group-modified forward osmosis membrane was ...
Embodiment 2
[0072] (1) Mix 35 g of sulfonated polysulfone, 0.5 g of diethylaminoethyl methacrylate, 15 g of hydroxyethyl methacrylate, 0.01 g of azobisisoheptanenitrile and 49.49 g of N,N'-dimethyl methacrylate Add methylformamide into the reaction kettle, pass argon, continue to stir until completely dissolved, and form a uniform and transparent mixed solution, then quickly heat up to 60 ° C, diethylaminoethyl methacrylate and hydroxyethyl methacrylate are free. base copolymerization reaction for 24 hours to obtain a film-forming solution;
[0073] (2) The film-forming solution is applied to the non-woven fabric, and rapidly immersed in a coagulation bath composed of 60 grams of 3-bromopropionic acid and 40 grams of ethanol at 80° C. to react the tertiary amine groups to generate zwitterionic groups to obtain Forward osmosis membrane modified with zwitterionic groups;
[0074] (3) The forward osmosis membrane modified with zwitterionic groups was immersed in a cross-linking bath compose...
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