Method for preparing high-performance reverse osmosis membrane based on construction of multiple network structure

Abstract

The invention is intended to provide a method for preparing a high-performance reverse osmosis membrane based on construction of multiple network structure. Before aqueous application, a mixed solution of dopamine and water-soluble macromolecules is applied to a base membrane, so that a three-dimensional network is constructed on the base membrane. The preparation process of the high-performance reverse osmosis membrane has the need for firstly applying the aqueous solution with dopamine and one or more types of water-soluble macromolecules to a polysulfone base membrane so that dopamine is self-polymerized to form a membrane; the water-soluble macromolecules are doped in the polydopamine membrane to form a three-dimensional network structure; the aqueous solution with a polyamine is applied then; an oil solution with poly-acyl chloride dissolved in IsoparL (isoparaffin solvent) is applied; the reverse osmosis membrane is prepared by interfacial polymerization. The ingredients of a coating solution herein and their types are optimally selected, the post-treatment temperature is regulated, and therefore, the high-performance reverse osmosis membrane is prepared.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis composite membranes, and in particular relates to a high-performance reverse osmosis membrane preparation method based on the construction of multiple network structures. [0002] technical background [0003] The core of reverse osmosis technology is high-performance reverse osmosis composite membrane. As the basis and core of separation membrane technology, functional membrane materials have always been the focus of membrane technology development in developed countries such as the United States and Japan, especially the research on high-performance reverse osmosis composite membranes. It is even more important. Now the general reverse osmosis membrane is a polyamide membrane obtained by interfacial polymerization. Due to its excellent separation performance, polyamide reverse osmosis composite membrane has become the mainstream application membrane for seawater desalination by reverse o...

AI Technical Summary

Problems solved by technology

Compared with other reverse osmosis membranes, polyamide reverse osmosis composite membranes have obvious advantages, but they still face three problems: the mutually restrictive relationship between flux and salt ion rejection, membrane surface contamination and chlorine oxidation, etc.

[0004] The self-aggregation-composite technology of dopamine (DOPA) biomimetic adhesion has become a research hotspot in the surface modification of materials today, but there are few studies on the use of this technology to construct network structures and further prepare reverse osmosis membranes.