▎ 摘　　要

NOVELTY - Antistatic polyvinylpyrrolidone-graphene modified polylactic acid based degradable plastic bag comprises 80-95 pts. wt. polylactic acid, 2-5 pts. wt. polyvinylpyrrolidone, 1-3 pts. wt. graphene, 2-5 pts. wt. polyethylene, 0.2-1 pts. wt. foaming agent, 0.5-1 pts. wt. titanate coupling agent, and 0.5-2 pts. wt. surfactant polyethylene glycol. USE - Antistatic polyvinylpyrrolidone-graphene modified polylactic acid based degradable plastic bag. ADVANTAGE - The antistatic polyvinylpyrrolidone-graphene modified polylactic acid based degradable plastic bag has improves toughness and strength of polylactic acid, has enhances the mechanical properties of polylactic acid, has high load bearing performance and can withstand heavier objects than traditional plastic bags. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing antistatic polyvinylpyrrolidone-graphene modified polylactic acid based degradable plastic bag, which involves: (A) taking 80-95 pts. wt. polylactic acid, 2-5 pts. wt. polyvinylpyrrolidone, 1-3 pts. wt. graphene, 2-5 pts. wt. polyethylene, 0.2-1 pts. wt. foaming agent, 0.5-1 pts. wt. titanate coupling agent, 0.5-2 pts. wt. surfactant polyethylene glycol weighing 2-5 pts. wt. polyvinylpyrrolidone and 1-3 pts. wt. graphene in a 1000 mL beaker; (B) adding 200 mL of distilled water and 400 mL glycerol to the beaker, heating to 60-70 degrees C in a water bath, and stirring at a constant speed for 1-1.5 hours; (C) mixing the polyvinylpyrrolidone and the graphene uniformly; (D) transferring the solution and the material in the beaker into the hydrothermal reaction kettle; (E) weighing 3-4 wt.% polyvinylpyrrolidone, the initiator azobisisobutyl hydrazine hydrochloride, and heat the hydrothermal reaction kettle to 170-180 degrees C in a high temperature heating oven for 6-8 hours to polymerize Vinyl pyrrolidone completely encapsulates graphene; (F) cooling the hydrothermal reaction vessel to room temperature after the reaction was completed, the material was taken out; (G) filtering the liquid to obtain a taupe solid powder; (H) washing the mixture with 2000-3000 mL of distilled water to remove glycerin; (I) placing the solid powder win an oven to be heated to 80-85 degrees C, heated for 2-3 hours; (J) drying to remove water, to obtain a black-gray solid powder polyvinylpyrrolidone-graphene; (K) weighing 80-95 pts. wt. polylactic acid, 100 mL distilled water and 300 mL ethylene glycol in turn; (L) adding to a 1000 mL three-necked flask, and adding the polyvinylpyrrolidone-graphene to the three-necked flask; (M) placing the three-necked flask was placed in an oil bath to be heated to 120-125 degrees C; (N) stirring at a constant speed for 4-6 hours until the polyvinylpyrrolidone-graphene was completely uniformly attached to the surface of the polylactic acid; (O) filtering the solution through a Buchner funnel; (P) obtaining a yellow-brown solid, washing the solid with 2500-3500 distilled water, completely removing the ethylene glycol; (Q) placing the yellow-brown solid in an oven, heating to 80-85 degrees C, for 2-3 hours; (R) drying to remove water to prepare a polyvinylpyrrolidone-graphene modified polylactic acid; (S) weighing 2-5 pts. wt. polyethylene, 0.2-1 pts. wt. foaming agent, 0.5-1 pts. wt. titanate coupling agent, and 0.5-2 surfactant polyethylene glycol in a twin-screw extruder; (T) kneading the polyvinylpyrrolidone-graphene modified polylactic acid; (U) passing the material through the conveying section, melting section, mixing section, exhaust section and homogenization section of the twin-screw extruder; (V) the extrusion temperature of the conveying section and the melting section is 165-175 degrees C, and the extrusion temperature of the venting section of the mixing section is 185-200 degrees C, the homogenization section extrusion temperature is 210-220 degrees C; (W) cooling the obtained materialand diced to obtain plastic granules; (X) blowing the plastic granules through a high and low pressure blown film machine; and (Y) obtaining the polyvinylpyrrolidone-graphene modified polylactic acid based degradable plastic bag through a bag cutter.