▎ 摘　　要

NOVELTY - Reverse osmosis membrane comprises a polyethylene microporous membrane, a polysulfone layer coated on the polyethylene microporous membrane and a polyamide layer coated on the polysulfone layer. The hole diameter of the polyethylene microporous film is 0.01-10 mu m, the porosity is 70-95%, and the thickness is 20-120 mu m. USE - Reverse osmosis membrane with polyethylene microporous film as base material. ADVANTAGE - The polyethylene microporous film has small hole diameter and excellent homogeneity, and excellent water flux and interception rate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing reverse osmosis membrane, which involves: (A) coating surface of the polyethylene microporous membrane with polysulfone casting liquid to obtain polyethylene microporous membrane covered with a polysulfone layer after curing; (B) adding m-phenylenediamine, triethylamine and camphor sulfonic acid to deionized water under stirring magnetically to obtain an aqueous solution; (C) adding trimesoyl chloride to n-hexane under stirring to dissolve to obtain trimesoyl chloride-n-hexane oil phase solution; (D) immersing polyethylene microporous membrane covered with polysulfone layer into water phase solution to remove solvent after taking out; (E) immersing in the prepared trimesoyl chloride-n-hexane oil phase solution for interface polymerize to form a polyamide layer; (F) removing solvent n-hexane after taking it out to obtain a nascent polyamide reverse osmosis membrane; (G) dissolving polyvinyl alcohol in deionized water under mechanical stirring to obtain a polyvinyl alcohol aqueous solution; (H) dissolving graphene oxide in deionized water under stirring magnetically and ultrasonically to obtain a graphene oxide aqueous solution; (I) combining the graphene oxide aqueous solution with polyvinyl alcohol aqueous solution to obtain a graphene oxide-containing polyvinyl alcohol aqueous solution; (J) adding glutaraldehyde, L-serine and hydrochloric acid to the graphene oxide-containing polyvinyl alcohol aqueous solution to obtain a graphene oxide-containing polyvinyl alcohol crosslinking reaction solution; (K) coating the graphene oxide-containing polyvinyl alcohol crosslinking reaction solution on the surface of the nascent reverse osmosis membrane; and (L) drying to obtain the reverse osmosis membrane.