Preparation method of reverse osmosis composite membrane and reverse osmosis composite membrane prepared thereby

Abstract

The present disclosure provides a preparation method of a reverse osmosis composite membrane, including the following steps: coating a gelatin solution on a non-woven fabric layer and cooling to form a gelatin gel layer; coating a salt solution on a surface of the gelatin gel layer to obtain a gel/non-woven fabric composite membrane; placing the gel/non-woven fabric composite membrane in an aqueous phase solution, transferring into an oil phase solution, and conducting interfacial polymerization to obtain a non-woven fabric/gel/polyamide composite membrane; placing the non-woven fabric/gel/polyamide composite membrane in water, and heating to remove the gelatin gel layer to obtain a non-woven fabric/polyamide composite membrane; and introducing a trimesoyl chloride (TMC) gas from a side where the non-woven fabric layer is away from a polyamide layer in the non-woven fabric/polyamide composite membrane, conducting gas-liquid interfacial polymerization by chemical vapor deposition (CVD), and drying to obtain the reverse osmosis composite membrane.

Dependencies are inferred from the claim text.