Preparation method of modified PVDF hollow fiber ultrafiltration membrane

The invention relates to the technical field of ultrafiltration membranes, and discloses a preparation method of a modified PVDF hollow fiber ultrafiltration membrane, 5-chloro-m-phenylenediamine, 1, 3-propane xantholactone, diethanol amine and graphene oxide are used as raw materials, and sodium disulfonate modified graphene is obtained through a ring-opening alkylation reaction, a substitution reaction and an esterification reaction. And finally, adding polyvinylidene fluoride resin, sodium disulfonate modified graphene, titanium dioxide modified cardanol, a polyvinylpyrrolidone pore-forming agent and an N, N-dimethylformamide solvent into a spinning tank, carrying out vacuum defoaming, spinning a blended hollow fiber ultrafiltration membrane by adopting an NIPS method, soaking with deionized water and glycerol, and drying to obtain the modified PVDF hollow fiber ultrafiltration membrane. The modified PVDF hollow fiber ultrafiltration membrane prepared by the invention has excellent mechanical properties an