US 12,458,930 B2
Scaling-resistant and yellowing-resistant reverse osmosis composite membrane and preparation method thereof
Juan Shen, Changzhou (CN); Yuchen Zhao, Changzhou (CN); Wei Wang, Changzhou (CN); Peng Zhang, Changzhou (CN); and Xiaodong Nan, Changzhou (CN)
Assigned to Jiangsu Longmem Environmental Technology Co., Ltd., Changzhou (CN)
Appl. No. 17/771,022
Filed by Jiangsu Longmem Environmental Technology Co., Ltd., Changzhou (CN)
PCT Filed Dec. 28, 2021, PCT No. PCT/CN2021/141911
§ 371(c)(1), (2) Date May 27, 2022,
PCT Pub. No. WO2022/105937, PCT Pub. Date May 27, 2022.
Claims priority of application No. 202110533257.3 (CN), filed on May 17, 2021.
Prior Publication US 2024/0139687 A1, May 2, 2024
Int. Cl. B01D 69/02 (2006.01); B01D 67/00 (2006.01); B01D 69/12 (2006.01); B01D 71/56 (2006.01)
CPC B01D 69/02 (2013.01) [B01D 67/0006 (2013.01); B01D 69/1214 (2022.08); B01D 69/125 (2013.01); B01D 71/56 (2013.01); B01D 2323/081 (2022.08); B01D 2323/12 (2013.01); B01D 2323/21839 (2022.08); B01D 2323/219 (2022.08); B01D 2323/38 (2013.01); B01D 2325/28 (2013.01); B01D 2325/36 (2013.01)] 8 Claims
 
1. A preparation method of a scaling-resistant and yellowing-resistant composite reverse osmosis membrane, wherein, comprising following steps:
(1) dissolving ethylene glycol methacrylate (EGMA) in anisole, and ultrasonically stirring to mix evenly; then sequentially adding a first initiator and 2-dodecylsulfanylthiocarbonylsulfanyl-2-methyl propionic acid (DMP) as a chain transfer agent, sealing and vacuum mixing at 25° C. for 5 h to obtain a product;
precipitating the product into a large amount of petroleum ether, then separating the product by filtration, and then vacuum drying the product at 40° C. for 24 h to obtain poly(ethylene glycol) methacrylate (PEGMA) particles;
(2) immersing a polysulfone supported membrane in pure water in advance for cleaning, and removing excess water via a rubber roller, then putting the polysulfone supported membrane in an aqueous phase solution for 15 seconds-60 seconds and in an oil phase solution for 15 seconds-60 seconds, and performing heat treatment for the polysulfone supported membrane to obtain a primary composite reverse osmosis membrane; and
(3) adding 2-(methacryloyloxy)ethyl)dimethyl-3-sulphoproyl) ammonium hydroxide (MEDSAH) and N-(isobutoxymethyl) acrylamide (IBMA) to tetrahydrofuran to mix evenly, and then adding azobisisobutyronitrile (AIBN) as a second initiator to obtain a solution; putting the primary composite reverse osmosis membrane prepared in the step (2) in the solution for ultrasonic reaction at 25° C. for 24 h, to obtain the scaling-resistant and yellowing-resistant composite reverse osmosis membrane.