▎ 摘　　要

NOVELTY - Polypropylene melt-blown electret masterbatch comprises 60-80 pts. wt. polypropylene, 12-17 pts. wt. tourmaline powder, 5-10 pts. wt. graphene material, 2-5 pts. wt. dispersant, 4-8 pts. wt. coupling agent, and 4-8 pts. wt. silica sol. USE - Used as polypropylene melt-blown electret masterbatch. ADVANTAGE - The masterbatch: solves the problem of bacterial corpses accumulation; promotes hole-electron migration of nano titanium dioxide by using electrical polarity of electret; improves bactericidal and antibacterial properties; and degrades the corpses of bacteria. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing polypropylene melt-blown electret masterbatch, comprising (i) stirring tourmaline powder, graphene and dispersant uniformly to obtain mixture, then adding coupling agent and petroleum ether and stirring uniformly to obtain slurry, where stirring speed is 1000-2000 revolutions/minute; and mass of petroleum ether is 10-20 times the mass of tourmaline powder, (ii) slowly dripping silica sol into slurry, and continue dispersing by low-temperature ultrasonic condition, and then distilling under reduced pressure until evaporate completely to obtain coated modified tourmaline powder, where the dripping rate of slowly dripping is 1-4 ml/minute, the temperature of low-temperature ultrasonic dispersion is 10-20 degrees C, and ultrasonic frequency is 50-80 kHz, the temperature of distillation under reduced pressure is 100-120 degrees C, and pressure is 70-80% atmospheric pressure, (iii) placing modified tourmaline powder in ultraviolet light environment, and allowing to stand for 20-40 minutes to obtain dispersed modified tourmaline powder, where the temperature of ultraviolet light is 20-40 degrees C, and light intensity is 1-5 mW/cm2, (iv) adding dispersed modified tourmaline powder and polypropylene into mixer and mixing uniformly, then adding into twin screw compounding extruder, melting and extruding, cooling in water bath, and cutting to obtain particles, and (v) adding the masterbatch into corona charging device for electret treatment to obtain final product, where the electret voltage is -25 kV.