▎ 摘　　要

NOVELTY - Preparing nano-filtration purifying membrane for emergency drinking involves (a) taking polyvinylidene fluoride, dopamine hydrochloride, polyethyleneimine and quaternized polyethylenimine, adding dimethyl acetamide, mixing and stirring at 60-70℃ for 12-15 hours to obtain a casting solution, (b) taking the casting solution and vacuum filtering and defoaming, (c) taking m-phenylenediamine and deionized water, stirring uniformly to obtain water phase solution, taking trimesoyl chloride and normal hexane, mixing them uniformly, adding acyl chloride oxidation graphene ultrasonically dispersing for 20-30 minutes to obtain an oil phase solution and (d) taking a supporting film, soaking for 2-5 minutes in the water phase liquid, taking out and leaving still for 40-50 minutes and drying, placing in the oil-phase solution, reacting for 30-60 seconds, leaving still and leaving for 2 minutes, drying for 4-6 minutes at 60-70℃, and washing. USE - The nano-filtration purifying film for emergency drinking is used in field of water treatment, especially for outdoor emergency drinking water. ADVANTAGE - The prepared purifying film has excellent anti-pollution performance, and has high water flux, low reverse salt flux, which is a positive permeable membrane with excellent performance, which can be widely applied to the field of water treatment, especially suitable for outdoor emergency drinking water, has high practicability, and improves the adhesion of the subsequent supporting film and the active layer.