High permeate flux reverse osmosis membrane including carbodiimide compound and method of manufacturing the same
The present invention relates to a reverse osmosis membrane including a porous support including a polysulfone layer; and a polyamide active layer formed on the porous support, wherein a concentration of sulfur (S) detected on a surface of the polyamide active layer is 1.8×10 −3 units or less on average or a concentration of sulfur dioxide (SO 2 ) detected on the surface of the polyamide active layer is 7×10 −3 units or less on average, and a method of manufacturing a reverse osmosis membrane, the method including forming a porous support; and forming a polyamide active layer on the porous support by interfacially polymerizing a polyfunctional amine solution including a carbodiimide compound, and a polyfunctional acid halide compound solution.
1. A reverse osmosis membrane comprising:
a porous support including a polysulfone layer; and
a polyamide active layer formed on the porous support, wherein a concentration of sulfur (S) detected on a surface of the polyamide active layer is 1.8×10 −3 units or less on average or a concentration of sulfur dioxide (SO 2 ) detected on the surface of the polyamide active layer is 7×10 −3 units or less on average,
wherein the polyamide active layer is formed by interfacially polymerizing a polyfunctional amine solution including a carbodiimide compound and a polyfunctional acid halide compound solution.
2. The reverse osmosis membrane of claim 1 , wherein the polyamide active layer has variations in water contact angles within a range of 0.1 to 20%.
3. The reverse osmosis membrane of claim 1 , wherein the polyamide active layer has an average water contact angle of 0° to 15°.
4. The reverse osmosis membrane of claim 1 , wherein the carbodiimide compound is represented by Formula 1:
where, R 1 , R 3 and R 4 each independently indicate a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 4 to 6 carbon atoms, and R 2 indicates a substituted or unsubstituted alkylene group having 1 to 30 carbon atoms, or a substituted or unsubstituted arylene group having 4 to 6 carbon atoms.
5. The reverse osmosis membrane of claim 1 , wherein the carbodiimide compound includes at least one compound selected from a group consisting of N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide, N,N′-dicyclohexylcarbodiimide, N,N′-diisopropylcarbodiimide, and N,N′-bis(2-methylphenyl)carbodiimide.
6. The reverse osmosis membrane of claim 1 , wherein the carbodiimide compound is included in an amount of 0.001 to 50 wt %, with respect to 100 w % of the polyfunctional amine solution.
7. A method of manufacturing a reverse osmosis membrane, the method comprising:
forming a porous support; and
forming a polyamide active layer on the porous support by interfacially polymerizing a polyfunctional amine solution including a carbodiimide compound, and a polyfunctional acid halide compound solution.
8. The method of claim 7 , wherein the carbodiimide compound is represented by Formula 1:
where, R 1 , R 3 and R 4 each independently indicate a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 4 to 6 carbon atoms, and R 2 indicates a substituted or unsubstituted alkylene group having 1 to 30 carbon atoms, or a substituted or unsubstituted arylene group having 4 to 6 carbon atoms.
9. The method of claim 7 , wherein the carbodiimide compound includes at least one compound selected from a group consisting of N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide, N,N′-dicyclohexylcarbodiimide, N,N′-diisopropylcarbodiimide, and N,N′-bis(2-methylphenyl)carbodiimide.
10. The method of claim 7 , wherein the carbodiimide compound is included in an amount of 0.001 to 50 wt %, with respect to 100 w % of the polyfunctional amine solution.