▎ 摘　　要

NOVELTY - A graphene-modified aldehyde-type polyurethane composite material comprises 90-100 pts. wt. polyurethane, 5-10 pts. wt. inorganic filler, 0.5-1 pt. wt. graphene/titania cleaning material, 1-5 pts. wt. multi-walled carbon nanotubes/nano-zinc oxide aldehyde-removing material, graphene quantum dots-porous graphene, 0.1-1 pt. wt. light stabilizer, 5-10 pts. wt. coupling agent, 0.1-2 pts. wt. leveling agent, 1-6 pts. wt. dispersing lubricant and 0.1-1 pt. wt. antioxidant. The weight ratio of graphene/titania cleaning material and multi-walled carbon nanotubes/nano-zinc oxide is 1:3-5. USE - Graphene-modified aldehyde-type polyurethane composite material is used for three-dimensional printing. ADVANTAGE - The graphene-modified aldehyde-type polyurethane composite material has excellent flexibility, mechanical property, self-cleaning property and anti-fouling property. DETAILED DESCRIPTION - A graphene-modified aldehyde-type polyurethane composite material comprises 90-100 pts. wt. polyurethane, 5-10 pts. wt. inorganic filler, 0.5-1 pt. wt. graphene/titania cleaning material, 1-5 pts. wt. multi-walled carbon nanotubes/nano-zinc oxide aldehyde-removing material, graphene quantum dots-porous graphene, 0.1-1 pt. wt. light stabilizer, 5-10 pts. wt. coupling agent, 0.1-2 pts. wt. leveling agent, 1-6 pts. wt. dispersing lubricant and 0.1-1 pt. wt. antioxidant. The weight ratio of graphene/titania cleaning material and multi-walled carbon nanotubes/nano-zinc oxide is 1:3-5. The content of graphene quantum dots is 0.5-1 wt.% of polyurethane. The content of porous graphene is 0.5-2 wt.% of polyurethane. The polyurethane composite material is prepared by pretreating polyurethane raw material by pulverizing polyurethane raw material to powder of 300 mesh, dispersing powder in pure water, ultrasonically processing for 1 hour, ultrasonically irradiating mixture for 1 hour, microwave irradiating mixture, washing, discharging and drying mixture, preparing polyurethane masterbatch by ultrasonically stirring graphene/titania cleaning material and pure water, dispersing mixture, adding multi-walled carbon nanotubes/nano-zinc oxide aldehyde-removing material, ultrasonically stirring with pure water, dispersing mixture, heating mixture, dissolving pretreated polyurethane in organic solvent to obtain polyurethane solution, dividing polyurethane solution to three portions to obtain polyurethane solutions (p1-p3), high-speed stirring polyurethane solutions (p1), ultrasonically stirring mixture for 30-60 minutes, adding polyurethane solutions (p2), ultrasonically stirring mixture for 30-60 minutes, adding polyurethane solutions (p3), ultrasonically stirring mixture for 30-60 minutes, dripping graphene quantum dot solution, ultrasonically stirring mixture for 30-60 minutes to obtain polyurethane mixture, passing polyurethane mixture to storage tank of spray dryer, spraying polyurethane mixture to spray dryer at 200-300 ml/minute and drying polyurethane masterbatch (m1), preparing polyurethane masterbatch (m2) by ultrasonically stirring and dispersing porous graphene in pure water to obtain porous graphene dispersion, heating porous graphene dispersion, dissolving porous graphene dispersion in organic solvent to obtain polyurethane solution, high-speed stirring at constant temperature, ultrasonically processing polyurethane solution, dripping porous graphene dispersion, ultrasonically stirring for 30-60 minutes to obtain mixture of graphene polyurethane, passing mixture of graphene polyurethane to reserve tank of spray dryer, spraying graphene urethane mixture to spray dryer at 200-300 ml/minute and drying mixture, and preparing polyurethane composite material by melt-mixing remaining pretreated polyurethane, polyurethane masterbatch (p1), polyurethane masterbatch (m2), light stabilizer, coupling agent, leveling agent, lubricant and antioxidant, adding mixture to mechanical grinding mill, pulverizing to obtain polyurethane composite powder having average particle diameter of 30-40 mixture, processing mixture at 95 degrees C for 2 hours, adding dried powder to twin screw extruder, cooling mixture to obtain shaped wire and winding wire.