Abstract: The present disclosure relates to a scaling-resistant and yellowing-resistant composite reverse osmosis membrane and a preparation method thereof. By modifying the stability and yellowing of a coating of the reverse osmosis membrane, and grafting 2-(methacryloyloxy)ethyl)dimethyl-3-sulphoproyl) ammonium hydroxide (MEDSAH) and ethylene glycol methacrylate (EGMA) as amphoteric monomers and N-(isobutoxymethyl)acrylamide (IBMA) as yellowing-resistant particles on a surface of the reverse osmosis membrane using active polymerization, the present disclosure forms a three-network high-performance PMEDSAH/PEGMA/PIBMA composite coating. By active regulation of a polyamide (PA) layer through the three systems, the reverse osmosis membrane has high compatibility due to PMEDSAH, and stability, high hydrophilicity and anti-protein fouling property due to PEGMA, as well as yellowing-resistant property by coating PIBMA on the surface.

Abstract: The present disclosure discloses a spacer tube reverse osmosis (STRO) membrane and a preparation method thereof, which relates to the technical field of reverse osmosis membranes. The preparation method of the STRO membrane specifically comprises the following steps: S101: preparation of a zirconia sol; S102: preparation of a casting solution; S103: preparation of a polysulfone ultrafiltration membrane; S104: immersion; and S105: coating. In the preparation method of the present disclosure, an ionic liquid and high-pressure-resistant particles are introduced into an ultrafiltration layer, the ionic liquid is cross-linked with the ultrafiltration layer in the process of interfacial polymerization, and a layer of the ionic liquid is coated on a surface, so that a three-layer high-performance three-dimensional crosslinking system is formed via the ionic liquid.