▎ 摘　　要

NOVELTY - Preparing antibacterial ventilating film involves weighing modified porous graphene, organic rare earth salts, antibacterial plant extracts, carrier resins, inorganic fillers, polyethylene and additives A, additives B, surfactant, carrier resin powder, and inorganic filler accurately as raw materials. The surfactant is added to deionized water, mixed under stirring, and then adding composition comprising antibacterial plant extract, and organic rare earth salt sequentially, then heating at a temperature of 60-90 degrees C by continues stirring for 5-25 minutes to obtain mixture. USE - Method for preparing antibacterial ventilating film. DETAILED DESCRIPTION - Preparing antibacterial ventilating film involves weighing modified porous graphene, organic rare earth salts, antibacterial plant extracts, carrier resins, inorganic fillers, polyethylene and additives A, additives B, surfactant, carrier resin powder, and inorganic filler accurately as raw materials. The surfactant is added to deionized water, mixed under stirring, and then adding composition comprising antibacterial plant extract, and organic rare earth salt sequentially, then heating at a temperature of 60-90 degrees C by continues stirring for 5-25 minutes to obtain mixture. The obtained mixture is added with modified porous graphene and ultrasonically dispersed for 2-24 hours to obtain suspension containing modified porous graphene. The suspension is frozen and vacuum dried to obtain modified porous graphene antibacterial powder. The carrier resin powder is added to high-speed kneader, and mixed with modified porous graphene antibacterial powder and auxiliary agent B and then kneaded into coating state sequentially to obtain kneaded mixture. The kneaded mixture is introduced into twin-screw extruder for extrusion granulation at a temperature of 105-275 degrees C to obtain modified porous graphene antibacterial masterbatch. The modified porous graphene antibacterial masterbatch is weighed is mixed with inorganic filler, polyethylene, and additive A and mied under stirring to obtain mixture. The mixture is added into the feeding barrel of screw extruder for melting and plasticizing and then rolled into permeable film substrate by casting roller and rubber roller, and cooled at the same time to obtain air permeable film substrate. The air permeable film substrate is heated at 70-90 degrees C for 10 seconds to 5 minutes, and then the film substrate is stretched in three stages to form nano-scale micro-holes to obtain high air permeability and high anti-bacterial breathable film. The high permeability and high antibacterial breathable film is passed through heat setting, cooling, trimming, winding, heat setting at 108-110 degrees C and maintaining cooling setting temperature to 30 degrees C to obtgain desired product.