Nanofiltration membrane suitable for low-temperature pretreatment of salt lake brine and preparation method thereof

The invention belongs to the technical field of nanofiltration membranes, and particularly discloses a nanofiltration membrane suitable for low-temperature pretreatment of salt lake brine and a preparation method of the nanofiltration membrane, an existing conventional method is adopted, only water-phase components and oil-phase components are improved, the water-phase components comprise, by mass, 0.8-1.2% of piperazine, 0.4-0.6% of 2, 2 '-bipyridine, 0.5-1.5% of 2, 2'-bipyridine, 0.5-1.5% of 2, 2 '-bipyridine, 0.5-1.5% of 2, 2 The disinfectant is prepared from the following components in percentage by weight: 0.4 to 0.6 percent of 1, 5-dimethylpiperazine, 0.4 to 0.6 percent of 2-ethylpiperazine, 1.0 to 1.4 percent of camphorsulfonic acid, 0.5 to 0.7 percent of triethylamine, 0.08 to 0.12 percent of lauryl sodium sulfate and the balance of water. And the oil phase comprises the following components in percentage by mass: 0.18-0.22% of trimesoyl chloride, 3-7% of methylbenzene and the balance of naphtha. The