▎ 摘　　要

NOVELTY - A temperature and pH double sensitive ultrafiltration membrane preparing method involves adding 0.1-0.2 g graphene oxide, 200-400 ml deionized water to three-necked flask and adding 0.8-1.6 g sodium borohydride to obtain a black solution. The black solution is added to 2-8 g isopropyl acrylamide, 0.6-10 g acrylic acid, 0.1-0.4 g methylene bis acrylamide and 50 ml deionized water to the flask, stirred and purged with dry nitrogen to remove oxygen, where the 100 ml ammonium persulfate aqueous solution is added through a dropping funnel and the mixture stirred in a constant temperature oil bath, the mixture is cooled to room temperature and diluted with 200 ml of deionized water, the black product collected by centrifugation and dried to obtain byproduct. The black solution is mixed with polymer film material, dimethylformamide and additive to obtain a casting solution. The casting solution is immersed in deionized water to obtain the finished product. USE - Method for preparing temperature and pH double sensitive ultrafiltration membrane. ADVANTAGE - The method enables preparing sensitive ultrafiltration membrane with more durable anti-pollution ability and better application prospect. DETAILED DESCRIPTION - A temperature and pH double sensitive ultrafiltration membrane preparing method involves adding 0.1-0.2 g graphene oxide, 200-400 ml deionized water to 1000 ml three-necked flask, stirring for 40-80 minutes and adding 0.8-1.6 g sodium borohydride, 75-85 degrees C oil bath for 24 hours to obtain a black solution. The black solution is added to 2-8 g isopropyl acrylamide, 0.6-10 g acrylic acid, 0.1-0.4 g methylene bis acrylamide and 50 ml deionized water to the flask, stirred for 30 minutes and purged with dry nitrogen for 30 minutes to remove oxygen, where the 100 ml ammonium persulfate aqueous solution having a mass fraction of 1-2% is added through a dropping funnel and the mixture stirred in a 65-75 degrees C constant temperature oil bath, after 48 hours, the mixture cooled to room temperature and diluted with 200 ml of deionized water, ultrasonic for 1 hour, the black product is collected by centrifugation, dried under vacuum at 40-50 degrees C for 24 hours to obtain the byproduct. The black solution is mixed with polymer film material, dimethylformamide, and additive, stirring and dissolving at 50-85 degrees C, and vacuuming and defoaming to obtain a casting solution. The casting solution is passed through a membrane-forming membrane, exposed to air for 2-60 seconds, immersed in a coagulation bath and immersed in deionized water to obtain the finished product.