Composite nano lubricating additive as well as preparation method and application thereof

The invention discloses a composite nano lubricating additive as well as a preparation method and application thereof. The lubricating additive is prepared by the following steps: dissolving 0.2-0.4 g of a rare earth samarium complex in a mixed solution of 20-30 mL of water and 30-35 mL of ethylene glycol, adding 110-230 g of modified black phosphorus quantum dots, stirring at 45-70 DEG C for 7-8 h, adjusting the pH value to 6-7 by using a sodium bicarbonate saturated solution, and finally carrying out centrifugal cleaning and vacuum drying on the precipitate. The composite nano lubricating additive is applied to preparation of a titanium and titanium alloy wire cold drawing lubricant. The black phosphorus quantum dot composite nano lubricating additive provided by the invention has the excellent characteristics of good wear resistance, good chemical stability, strong dispersing capacity, good adhesiveness and the like, can reduce the surface quality problem of the titanium alloy wire in the cold drawing proc