Polyamide reverse osmosis composite membrane and preparation method thereof
A reverse osmosis composite membrane and polyamide technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of membrane water flux decline, achieve low surface tension, increase the degree of polymerization, and improve The effect of salt rejection
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[0021] In the preparation process of polyamide reverse osmosis composite membrane, adding surfactant to the water phase can not only make the water phase solution contact with the polysulfone-based membrane more fully, but also prepare a more complete polyamide active layer, but in The increase in salt rejection results in a decrease in water flux. To address this defect, the present invention uses polyether-modified polydimethylsiloxane as a surfactant and adds it to the aqueous phase solution prepared by the polyamide reverse osmosis composite membrane. The prepared reverse osmosis composite membrane not only improves the desalination rate, but also Water flux has little effect.
[0022] Herein, a range indicated by "one value to another value" is a general representation which avoids enumerating all values in the range in the specification. Therefore, the description of a specific numerical range covers any numerical value in the numerical range and the smaller numerical...
Embodiment 1
[0032] Prepare an aqueous m-phenylenediamine solution with a mass fraction of 6%, 0.05 wt% sodium hydroxide, and 0.01 wt% polyether-modified polydimethylsiloxane, and stir for 5 minutes. Prepare a trimesoyl chloride n-hexane solution with a mass fraction of 0.3%, and stir for 10 min. Immerse the polysulfone support membrane in the above m-phenylenediamine aqueous solution for 25s, remove the solvent after taking it out, and then immerse it in the above trimesoyl chloride n-hexane solution for interfacial polymerization reaction, the interfacial polymerization reaction time is 50s. After the reaction is completed, it is treated in an oven and hot water, moisturized by glycerin, and then dried to obtain a polyamide reverse osmosis composite membrane. The water flux and desalination rate of the membrane are measured.
Embodiment 2
[0034] Prepare an aqueous m-phenylenediamine solution with a mass fraction of 6%, 0.05wt% sodium hydroxide, and 0.04wt% polyether-modified polydimethylsiloxane, and stir for 5 minutes. Prepare a trimesoyl chloride n-hexane solution with a mass fraction of 0.3%, and stir for 10 min. Immerse the polysulfone support membrane in the above m-phenylenediamine aqueous solution for 25s, remove the solvent after taking it out, and then immerse it in the above trimesoyl chloride n-hexane solution for interfacial polymerization reaction, the interfacial polymerization reaction time is 50s. After the reaction is completed, it is treated in an oven and hot water, moisturized by glycerin, and then dried to obtain a polyamide reverse osmosis composite membrane. The water flux and desalination rate of the membrane are measured.
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