Reverse osmosis membrane with PE microporous membrane as base material and preparation method of reverse osmosis membrane

Abstract

The invention discloses a reverse osmosis membrane with a PE microporous membrane as a base material and a preparation method of the reverse osmosis membrane. The reverse osmosis membrane comprises the PE microporous membrane, a polysulfone layer coating the PE microporous membrane and a polyamide layer coating the polysulfone layer, the pore diameter of the PE microporous membrane is 0.01-10 microns, the porosity is 70-95%, and the thickness is 20-120 microns. The PE microporous membrane is small in aperture and excellent in homogeneity, the surface of the PE microporous membrane is coated with the polysulfone layer, and due to the fact that organic solvents such as DMF, DMAc, NMP or DMSO are adopted during polysulfone coating, the PE microporous membrane is easily dissolved in the solvents, the PE microporous membrane can be subjected to permeation etching, and the aperture of the surface of the polysulfone layer becomes small and is more uniform. The pore diameter of the polysulfone layer is more uniform, so that the defects of the polyamide layer in the polymerization process are reduced, the polyamide layer is more uniform, and the performance is more excellent. The prepared reverse osmosis membrane has excellent water flux and rejection rate.

Description

technical field

[0001] The invention belongs to the field of reverse osmosis membranes, in particular to a reverse osmosis membrane with a PE microporous membrane as a base material and a preparation method thereof. Background technique

[0002] Reverse osmosis is an efficient water purification method, which has the advantages of high efficiency, low cost, no phase change, easy integration, modularization and automation, etc. It is widely used in the preparation of high-purity water in the electronics industry, medical water preparation, seawater desalination, Water desalination, sewage recycling and many other fields. With the shortage of global fresh water resources and the increasingly serious water pollution, reverse osmosis technology is playing an increasingly important role in water purification.

[0003] However, the pore size distribution of the base membrane of the reverse osmosis membrane is not uniform at present, and the surface pore size of the reverse osmosi...

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