High-flux and high-selectivity composite nanofiltration membrane based on self-polymerization microporous structure and preparation method of high-flux and high-selectivity composite nanofiltration membrane

The invention discloses a high-flux and high-selectivity composite nanofiltration membrane based on a self-polymerization micropore (PIMs) structure and a preparation method of the high-flux and high-selectivity composite nanofiltration membrane, and belongs to the field of nanofiltration membrane separation. Comprising the following steps: firstly, taking 3, 4-dimethoxyaniline and a formaldehyde monomer as raw materials, synthesizing a Tetramethoxybenzene intermediate in a concentrated hydrochloric acid solution, and then reducing the intermediate to generate a Tetraphenol monomer (THB-TB); and then carrying out interfacial polymerization on a mixed water-phase solution of a Tetrahydroxybenzene monomer and piperazine and a trimesoyl chloride oil-phase solution on a polyethersulfone ultrafiltration support base membrane to prepare the composite nanofiltration membrane based on a self-polymerized micropore (PIMs) structure. Compared with a conventional polyamide composite nanofiltration membrane, the water flu