▎ 摘　　要

NOVELTY - Preparing graphene/N-isopropylacrylamide composite microgel, involves (a) adding black lead and sodium polystyrene sulfonate in water, adding ferric salt and ferrite, adding aqueous ammonia, reacting the mixture, obtaining product, washing product, and drying the product to obtain composite powder, (b) adding the composite powder to aqueous solution containing N-isopropylacrylamide and potassium peroxydisulfate (initiator), and implementing ultrasonic dispersion, and (c) continuously generating equal liquid drops, obtaining product, and washing the product. USE - The method is useful for preparing graphene/N-isopropylacrylamide composite microgel. ADVANTAGE - The method is simple, and has moderate polymerizing condition, and short reaction time. The grain diameter of the microgel is equal and controllable, hence the microgel has excellent resistance to external magnetic field. DETAILED DESCRIPTION - Method for preparing graphene/N-isopropylacrylamide composite microgel, involves (a) adding black lead and sodium polystyrene sulfonate in water at room temperature, ultrasonically dispersing the mixture to form graphene reaction solution, heating the mixture to 90-110 degrees C, reacting the mixture for 8-16 hours, adding ferric salt and ferrite to the reaction solution under the protection of nitrogen at room temperature, adding aqueous ammonia to the mixture, cooling the mixture to 70-90 degrees C, reacting the mixture for 20-40 minutes, adding oleic acid to the mixture, reacting the mixture for 80-100 minutes, cooling the mixture to room temperature, obtaining product using magnet, washing the product, and drying the product to obtain water dispersible grapheme/magnetite composite powder, (b) adding the composite powder to aqueous solution containing N-isopropylacrylamide and potassium peroxydisulfate (initiator), ultrasonically dispersing the mixture to form dispersed phase, adding N,N,N',N'-tetramethylethylenediamine in edible oil, and implementing ultrasonic dispersion to obtain continuous phase, and (c) adding the dispersed phase and continuous phase in injectors, adding the injectors on two boost pumps, connecting micro-channel reactor, hence the two phases are meet in the micro-channel, continuously generating equal liquid drops, flowing the liquid drops in the micro channel with the boosting of the boost pumps, water-bathing for 1-3 seconds at 40-60 degrees C, polymerizing the product, obtaining product, and washing the product to obtain composite microgel.