The invention discloses a surface
grafting modified aromatic
polyamide composite
reverse osmosis membrane and a preparation method thereof. The surface
grafting modified aromatic
polyamide composite
reverse osmosis membrane is formed by the connection of carboxyl groups on the surface of the aromatic
polyamide composite
reverse osmosis membrane and one primary amine of ethidene
diamine and the connection of another primary amine of the ethidene
diamine and
hydroxymethyl groups of
imidazolidinyl urea. The preparation method of the surface
grafting modified aromatic polyamide composite reverse
osmosis membrane comprises the following steps of: activating the carboxyl groups on the surface of the membrane by 1-(3-dimethylamino propyl group)-3-ethyl
carbodiimide hydrochloride and N-hydroxyl
succinimide, so that the carboxyl groups react with the primary amine of the ethidene
diamine, and the ethidene diamine is grafted to the surface of the membrane; and activating
imidazolidinyl urea molecules according to the same process, so that the
imidazolidinyl urea molecules react with the another primary amine of the ethidene diamine molecule grafted to the surface of the membrane, thus obtaining the surface grafting modified aromatic polyamide composite reverse
osmosis membrane. The preparation method has the advantages of mild
reaction conditions and simple process; and the prepared surface grafting modified aromatic polyamide composite reverse
osmosis membrane has high properties of
biological pollution resistance and
chlorine-resistance.