A zwitterionized high-strength pollution-resistant forward osmosis membrane and preparation method thereof
A zwitterionic and forward osmosis membrane technology, applied in the field of membrane separation, can solve the problems of low efficiency and poor controllability, and achieve the effects of enhanced mechanical strength, excellent forward osmosis flux, and large-scale development and production
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[0025] As an aspect of the technical solution of the present invention, it relates to a method for preparing a zwitterionized high-strength pollution-resistant forward osmosis membrane, which includes:
[0026] providing a mixed reaction system comprising at least a zwitterionic monomer, a crosslinking agent, an initiator, a polymer and a solvent;
[0027] heating the mixed reaction system to cause free radical polymerization-micro-crosslinking reaction of zwitterionic monomers to form zwitterionic polymers to obtain membrane-forming solutions;
[0028] The membrane-forming solution is prepared into a membrane, and the zwitterionic polymer is modified on the surface of the membrane through surface segregation and a semi-interpenetrating network structure is formed in the membrane during the membrane-forming process, thereby obtaining zwitterionic high-strength resistance Fouling the forward osmosis membrane.
[0029] In some embodiments, the preparation method includes:
[0...
Embodiment 1
[0061] (1) 5 grams of polysulfone, 1 gram of 5-(2-methacryloyloxyethyl dimethylamino) pentanecarboxylic acid inner salt and 94 grams of dimethyl sulfoxide are added to the reaction kettle, and argon is ventilated , Stir continuously at 10°C until completely dissolved, forming a uniform and transparent mixed solution;
[0062] (2) Keep stirring and argon, add 0.01 g of N,N'-methylenebisacrylamide and 0.01 g of azobisisobutyronitrile into the reaction kettle, rapidly heat up to 60 ° C, 5-(2-methyl Acryloyloxyethyl dimethylamino) pentanecarboxylic acid inner salt undergoes free radical polymerization, and the polymerization time is 0.5 hour to obtain a film-making solution;
[0063] (3) Evenly scrape-coat the membrane-forming solution on the non-woven fabric, quickly immerse in water at 5° C. to solidify to form a membrane, and wash to obtain an amphoteric ionization high-strength pollution-resistant forward osmosis membrane.
[0064] After testing, the contact angle between the...
Embodiment 2
[0066] (1) 30 grams of sulfonated polysulfone, 20 grams of 3-(2-methacryloyloxyethyl dimethylamino) propanecarboxylic acid inner salt and 50 grams of N-methylpyrrolidone are added to the reaction kettle, and the Argon, 50 ℃ continuous stirring until completely dissolved, forming a uniform and transparent mixed solution;
[0067] (2) Keep stirring and argon, add 0.5 g of N,N'-vinylbisacrylamide and 0.8 g of azobisisoheptanonitrile into the reaction kettle, rapidly heat up to 100 ° C, 3-(2-methyl Acryloyloxyethyl dimethylamino) propanecarboxylic acid inner salt undergoes a radical polymerization reaction, and the polymerization time is 48 hours to obtain a film-making solution;
[0068] (3) Evenly scrape-coat the film-making solution on the non-woven fabric, quickly immerse it in a saturated sodium chloride aqueous solution at 100° C. to solidify to form a film, and wash to obtain an amphoteric ionized high-strength pollution-resistant forward osmosis membrane.
[0069] After t...
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