COATING COMPOSITION FOR FABRICATING POLYETHERSULFONE BASED REVERSE OSMOSIS MEMBRANE FOR SEA WATER AND METHOD FOR PREPARATION OF POLYETHERSULFONE BASED REVERSE OSMOSIS MEMBRANE USING THE SAME

摘要

PURPOSE: A coating liquid composition is provided to have excellent flow, high durability, and chemical resistance, and to have excellent salt-exclusion by having charges on the surface of a membrane. CONSTITUTION: A coating liquid composition comprises a polyethersulfone-based copolymer and polyfunctional amine. The polyethersulfone-based copolymer is obtained by the condensation polymerization of an amine group-containing monomer and an ether sulfone-based monomer. The weight ratio of the amine group-containing monomer and ether sulfone-based monomer is 10-40:60-90. The amine group-containing monomer is selected from bis(3-amino-4-hydroxyphenyl)sulfone, 3,3`-diaminodiphenylsulfone, and m- aminophenol. The ether sulfone-based monomer selected from bisphenol, bisphenol-A, hydroquinone, and dichlorodiphenylsulfone. [Reference numerals] (a) Polyethersulfone support layer SEM image; (AA) Interfacial polymerization; (b) Surface SEM image; (BB) Active layer; (c) Cross-section SEM image; (CC) Support layer