US 12,440,809 B1
Preparation method for reverse osmosis membrane resistant to high-temperature water environment
Yinong Xu, Zhejiang (CN); Donggen Chen, Zhejiang (CN); Peng Liu, Zhejiang (CN); Zedong Li, Zhejiang (CN); Kan Zhang, Zhejiang (CN); Zhonghua Li, Zhejiang (CN); Qicheng Ren, Zhejiang (CN); and Rui Liu, Zhejiang (CN)
Assigned to Zhejiang Jinmo Environmental Technology Co., Ltd, Zhejiang (CN)
Filed by Zhejiang Jinmo Environmental Technology Co., Ltd, Zhejiang (CN)
Filed on Apr. 20, 2025, as Appl. No. 19/183,913.
Int. Cl. B01D 69/12 (2006.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 71/48 (2006.01); B01D 71/56 (2006.01)
CPC B01D 69/1251 (2022.08) [B01D 67/0095 (2013.01); B01D 67/0097 (2013.01); B01D 69/02 (2013.01); B01D 71/48 (2013.01); B01D 71/56 (2013.01)] 8 Claims
 
1. A preparation method for a reverse osmosis membrane resistant to a high-temperature water environment, comprising the following steps:
(1) first, synthesis of an α-cyclodextrin@polyethylene glycol supramolecular inclusion complex (α-CD@PEG) by a saturated aqueous solution coprecipitation method: first, dissolving a specific quantity of polyethylene glycol in ultrapure water to prepare a polyethylene glycol saturated aqueous solution; then, adding α-cyclodextrin powder to the polyethylene glycol saturated aqueous solution, performing constant-temperature stirring and standing, cooling to an ambient temperature, filtering out precipitates, and drying to obtain α-cyclodextrin@polyethylene glycol powder;
(2) preparation of an aqueous phase solution: dissolving a specific quantity of m-phenylenediamine, D(+) camphorsulfonic acid and triethylamine in a specific quantity of ultrapure water to prepare the aqueous phase solution;
(3) preparation of an oil phase solution: dissolving a specific quantity of trimesoyl chloride in a specific quantity of n-hexane to prepare the oil phase solution;
(4) preparation of a secondary aqueous phase solution: dissolving a specific quantity of the α-cyclodextrin@polyethylene glycol powder and triethylamine in a specific quantity of ultrapure water to prepare the secondary aqueous phase solution;
(5) interfacial polymerization: taking a base membrane from water, blowing water away from a surface of the base membrane with nitrogen, and pouring the aqueous phase solution onto the surface of the base membrane for 30 s-180 s; removing the superfluous aqueous phase solution, and then blow-drying the surface of the base membrane with nitrogen; pouring the oil phase a solution onto the surface of the base membrane for a reaction, and then removing the superfluous oil phase solution to yield a prepared membrane; thermocuring the prepared membrane in an oven to form an ultrathin polyamide separation layer on the prepared membrane; and
(6) secondary interfacial polymerization: pouring the secondary aqueous phase solution onto the ultrathin polyamide separation layer of the prepared membrane for a reaction, and then removing the superfluous solution to form an α-CD@PEG polyester protection layer on the ultrathin polyamide separation layer yielding a prepared reverse osmosis membrane; washing a surface of the prepared reverse osmosis membrane with ultrapure water.