Method of preparing reverse osmosis membrane with charged hydrogel and polyamide double network

A method of preparing reverse osmosis membrane with double network of charged hydrogel and polyamide, characterized in that, said method comprising the steps of:

• (a) preparing a polymer solution, which comprises the steps of:
• (a.1) adding m-phenylenediamine, polymer monomer with ionic group and crosslinking agent into deionized water, carrying out magnetic stirring to obtain an aqueous solution of polymer solution, wherein the polymer monomer with ionic group are organic compounds with ionic groups and carbon-carbon double bonds, the polymer monomer with ionic group is selected from the group consisting one or more of 3-sulfopropyl methacrylate potassium salt, methacryloyloxyethyl trimethyl ammonium chloride solution, [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl) ammonium hydroxide, 2-methacryloyloxy phosphorylcholine, carboxybetaine methacrylate, and carboxybetaine acrylamide, the crosslinking agent is an organic compound with two carbon-carbon double bonds, and the crosslinking agent is selected from the group consisting one or more of polyethylene glycol diacrylate, N,N-methylenebis(acrylamide) and N,N-dimethylacryloylcystine, and in the aqueous solution of polymer solution, a mass fraction of m-phenylenediamine is 1.0%~10%, a mass fraction of the polymer monomer with ionic group is 0.001%~10%, and a mass fraction of the crosslinking agent is 0.001%~10%;
• and
• (a.2) adding trimesoyl chloride and photoinitiator to an organic solvent and stirring evenly to obtain a polymer solution in organic phase, wherein in the polymer solution in organic phase, a mass fraction of the trimesoyl chloride is 0.05%~0.5%, and a concentration of the photoinitiator is 0.001~0.1 g/mL, the organic solvent is selected from the group consisting one or more of isopar-G, benzene, xylene, n-hexane and cyclohexane, the photoinitiator is selected from the group consisting of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropanone, 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone and diphenylacetone;
• (b) preparing a reverse osmosis membrane, which comprises the steps of:
• (b.1) carrying out cleaning of a membrane and fixing of the membrane after cleaning on a glass plate, pouring deionized water on a membrane surface of the membrane for wetting, pouring out the deionized water on the membrane surface after the membrane is wetted, and carrying out blow drying of the membrane surface;
• (b.2) pouring the aqueous solution of polymer solution on the membrane surface for wetting, and pouring out the aqueous solution of polymer solution on the membrane surface after the membrane is wet, and removing residual droplets on the membrane surface;
• and
• (b.3) pouring the polymer solution in organic phase onto the membrane surface and placing the membrane under ultraviolet light to carry out reaction to obtain a reverse osmosis membrane with double network of charged hydrogel and polyamide;
• and
• (c) cleaning the membrane, which comprises the steps of:
• washing the reverse osmosis membrane with double network of charged hydrogel and polyamide with deionized water and then storing the reverse osmosis membrane with double network of charged hydrogel and polyamide in deionized water.