Method for modifying aromatic polyamide composite membrane

The invention provides a method for modifying an aromatic polyamide composite membrane, which comprises the following steps of: grafting an aromatic polyamide composite membrane by using organic polyamine, and introducing amino on the surface of the aromatic polyamide composite membrane; the preparation method comprises the following steps: carrying out ring-opening reaction on amino on the surface of the membrane and N-glycidyl unsaturated amine, and grafting unsaturated zwitterions on the surface of the aromatic polyamide composite membrane in a monomolecular layer mode and with a high-density effect with a quaternization product of 3-chloro-2-hydroxy sodium propanesulfonate. And a material foundation is laid for synchronously improving the surface hydrophilicity, sterilization and antifouling properties and chlorine resistance of the aromatic polyamide composite membrane. 本发明提供一种改性芳香聚酰胺复合膜的方法，其是以有机多胺接枝新生芳香聚酰胺复合膜，在芳香聚酰胺复合膜表面引入氨基；而后膜表面上的氨基与N-缩水甘油基不饱和胺的开环反应，再后与3-氯-2-羟基丙磺酸钠的季铵盐化产物，以单分子层方式、高密度的效果在芳香聚酰胺复合膜表面接枝不饱