▎ 摘　　要

NOVELTY - Polyurethane composition comprises 40-60 pts. wt. polyester polyol, 30-40 pts. wt. isocyanate, 0.1-1 pts. wt. foaming agent, 0.1-1 pt. wt. catalyst, 0.5-5 pts. wt. chain extender, 0.1-1 pt. wt. polyurethane plasticizer, 0.1-1 pt. wt. foam stabilizer, and 0.1-2 pt. wt. graphene oxide-supported silver nanoparticles. USE - The polyurethane composition is used in a polyurethane microcellular foamed elastomer which is used as a polyurethane foam sole for producing a polyurethane sole for multi-top injection-molded shoes (claimed). ADVANTAGE - The polyurethane composition effectively improves tear resistance and tensile properties, and improves antibacterial properties of the polyurethane elastomer. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a polyurethane microcellular foamed elastomer comprising the polyurethane composition; and (2) a method for preparing the polyurethane microcellular foamed elastomer comprising stirring and ultrasonically dispersing polyester polyol, foaming agent, polyurethane plasticizer, foam stabilizer, catalyst, chain extender, graphene oxide-supported silver nanoparticles and isocyanate, and foaming and crosslinking, where the graphene oxide-loaded silver nanoparticles are prepared by (a) dissolving graphite in concentrated sulfuric acid in an ice bath to form a suspension, adding potassium nitrate and stirring, and adding potassium permanganate after stirring, reacting at 20-45degrees Celsius for 1-12 hours, after the reaction is completed, adding water to the system, and stirring the reaction at 0-10degrees Celsius for 1-10 hours, finally, adding hydrogen peroxide and deionized water to the reaction system, and washing the product to neutrality with a weakly acidic solution, (b) dissolving the graphene oxide prepared by the above steps in water and ultrasonically dispersing to form a suspension, adding protease and silver nitrate solution and stirring at 30-40?oC and reacting in a dark room, and centrifuging to obtain graphene oxide-loaded silver nanoparticles, where the protease is chosen from pepsin, papain, trypsin, cathepsin, or subtilisin.