High-flux nanofiltration membrane for treating generator coating wastewater as well as preparation method and application of high-flux nanofiltration membrane

The invention provides a high-flux nanofiltration membrane for treating generator coating wastewater as well as a preparation method and application of the high-flux nanofiltration membrane, and belongs to the technical field of water treatment. The high-flux nanofiltration membrane is composed of three layers of structures, the bottom layer is a polysulfone ultrafiltration membrane, the middle layer is sulfonated polyethersulfone, and the top layer is a polyamide layer formed after piperazine and trimesoyl chloride are polymerized. The nanofiltration membrane is provided with the low-roughness ultrathin polyamide selection layer, the water flux of the nanofiltration membrane is remarkably improved and is improved by 2.75 times or above compared with that of an existing nanofiltration membrane, meanwhile, the interception rate of the nanofiltration membrane to various salts is very high, for example, the interception rate to Na2SO4 reaches up to 98.8%, the selection-permeability equilibrium upper limit of the