Preparation method of hydrophilic-chlorination-resistant modified polymer composite hollow fiber membrane

The invention discloses a preparation method of a hydrophilic-chlorination-resistant modified polymer composite hollow fiber membrane. The polypropylene-ethylene-vinyl alcohol copolymer composite material is prepared by performing compatiblizing modification on polypropylene and an ethylene-vinyl alcohol copolymer through an appropriate compatilizer. Due to the fact that the ethylene-vinyl alcohol copolymer contains carboxyl, the material has the certain durable hydrophilic property; meanwhile, the obtained polypropylene-ethylene-vinyl alcohol copolymer composite hollow fiber membrane is grafted with sodium phytate by taking water-soluble epoxy ethane as a bridge through a chemical graft crosslinking reaction, and therefore the hydrophilic property of the membrane is greatly improved through multiple remaining phytic acid radicals in sodium phytate; through self-crosslinking of water-soluble epoxy ethane, the retention rate of the membrane can be increased, and the chlorine resistance of the membrane also can be improved to a certain extent. More hydrophilic radicals are grafted to the surface of the membrane through a chemical crosslinking method, and therefore the prepared polypropylene-ethylene-vinyl alcohol copolymer composite hollow fiber membrane is good in hydrophilic property and chlorine resistance and high in mechanical property.