Reverse-osmosis membrane having excellent salt rejection and method for manufacturing thereof

摘要

A method for manufacturing a high salt rejection rate reverse osmosis membrane is provided. The method of manufacturing a high salt rejection rate reverse osmosis membrane according to an embodiment of the present invention comprises the steps of (1) treating at least one surface of a support with a polymer solution to form a porous polymer support layer (2) polyfunctional amine compound on the polymer support layer and forming a polyamide layer including a formylated amine compound by adding a first solution containing a compound represented by the following Chemical Formula 1 and then contacting it with a second solution containing a polyfunctional acid halogen compound. is carried out including [Formula 1] The R 1 , R 2 and R 3 are an alkyl group satisfying a weight average molecular weight of 100 to 5000 and a carbon number of 1 to 18 or an isomer thereof. According to this, it is possible to implement a reverse osmosis membrane having a dense pore size, thereby greatly improving the salt rejection efficiency and the organic material removal efficiency. At the same time, there is almost no loss in the permeate flow rate, so it is possible to greatly improve the utilization in various fields where the reverse osmosis membrane is used.