▎ 摘　　要

NOVELTY - Metal processing water lubricating nano additive, prepared by (i) adjusting the pH of the graphene quantum dot solution containing carboxy groups at a concentration of 15-25 g/l to neutral; (ii) adding 1.5-2.5 g N-isopropylacrylamide monomer, 0.02-0.04 g N,N'-methylenebispropylamide crosslinking agent, 0.01-0.03 g sodium lauryl sulfate, and 2-10 ml above neutral solution of graphene quantum dots sequentially into a beaker containing 120 ml deionized water, uniformly ultrasonically dispersing to form the first dispersed phase, and ultrasonically dispersing uniformly to form a second dispersed phase; and (iii) placing the first dispersed phase in a four-necked flask and letting nitrogen gas into it, performing deoxygenation treatment, and heating the solution to 65-70 degrees C, changing deionized water every 5-7 hours, and dialyzing for 6-8 days to obtain metal processing water-lubricated nano-additive graphene quantum dot-polyN-isopropylacrylamide composite microgel, is claimed. USE - Used as metal processing water lubricating nano additive. ADVANTAGE - The method solves the problem of agglomeration of graphene quantum dots, The composite microgel has a particle size of 60-100nm, uniform and controllable particle size, and good dispersion, excellent lubricating properties for titanium alloy/hard alloy friction pairs and good application prospects in titanium alloy processing and other fields. DETAILED DESCRIPTION - Metal processing water lubricating nano additive, prepared by (i) adjusting the pH of the graphene quantum dot solution containing carboxy groups at a concentration of 15-25 g/l to neutral; (ii) adding 1.5-2.5 g N-isopropylacrylamide monomer, 0.02-0.04 g N,N'-methylenebispropylamide crosslinking agent, 0.01-0.03 g sodium lauryl sulfate, and 2-10 ml above neutral solution of graphene quantum dots sequentially into a beaker containing 120 ml deionized water, uniformly ultrasonically dispersing to form the first dispersed phase, dissolving 1-2 g potassium persulfate in 100 ml deionized water that has undergone deoxygenation treatment, and ultrasonically dispersing uniformly to form a second dispersed phase, where the ultrasonic power is 200-400 W, and the ultrasonic time is 20-40 minutes; and (iii) placing the first dispersed phase in a four-necked flask and letting nitrogen gas into it, performing deoxygenation treatment, and heating the solution to 65-70 degrees C, dropping 3-8 mk of the second dispersed phase at a dropping rate of 50-70 drops/minute, reacting for 4-5 hours, using a dialysis bag with a molecular weight cutoff of 3500D, changing deionized water every 5-7 hours, and dialyzing for 6-8 days to obtain metal processing water-lubricated nano-additive graphene quantum dot-polyN-isopropylacrylamide composite microgel, is claimed.