Preparation method of composite reverse osmosis membrane

Abstract

The invention discloses a preparation method of a composite reverse osmosis membrane, and particularly relates to a preparation method of an organic acylating chlorination nanometer titania modified aramid composite reverse osmosis membrane. The preparation method comprises the following steps of: preparing organic phase solution of trimesoyl chloride; then adding acylating chlorination modified nanometer titania into the organic phase solution to prepare uniform suspension liquid; soaking backup polysulfone supporting membrane in m-phenylenediamine (MPD) aqueous solution with the mass concentration of 0.5% to 3%, wherein the aqueous solution contains sodium dodecyl sulfate (SDS); then rolling through a rubber roller to remove excessive solution; after drying the solution, contacting the dried solution with the organic phase solution that is subjected to ultrasonic dispersion just now for 10 to 120 seconds; and finally, drying the solution in vacuum to obtain the product. The preparation method of the composite reverse osmosis membrane disclosed by the invention has the advantages that a stable structure is formed in the reaction, therefore, the mechanical strength of the reverse osmosis membrane can be improved, and meanwhile, the flux of pure water of the membrane can be improved by virtue of nano particles while an original high salt removing rate is maintained. The preparation method is simple and is easy to implement.

Description

technical field [0001] The invention relates to a method for preparing a polymer composite membrane, in particular to a method for preparing an aromatic polyamide composite reverse osmosis membrane modified by organic acyl chloride nano-titanium dioxide. Background technique [0002] High-flux reverse osmosis membranes are required for modern industrial applications. At present, the improvement of reverse osmosis membranes mainly focuses on the development of new monomers, surface modification and addition of small organic molecules. Although some results have been achieved, they cannot fundamentally meet the requirements. In recent years, with the maturity of the preparation technology of inorganic nanomaterials, the research on the reverse osmosis by interfacial polymerization filled with inorganic particles has also become one of the research hotspots on the performance of reverse osmosis membranes. [0003] The preparation process of the reverse osmosis interfacial poly...

AI Technical Summary

Problems solved by technology

[0002] High-flux reverse osmosis membranes are required for modern industrial applications. At present, the improvement of reverse osmosis membranes mainly focuses on the development of new monomers, surface modification and addition of small organic molecules. Although some results have been achieved, they cannot fundamentally up to the requirements