▎ 摘　　要

NOVELTY - Preparation of high-barrier polylactic acid film containing three-dimensional barrier network includes providing raw materials i.e. polylactic acid, polyethylene oxide, and graphene oxide, and reagent i.e. emulsifier, water and dichloromethane, preparation of polylactic acid microspheres by dissolving polylactic acid at room temperature to obtain clear solution, adding water-soluble emulsifier into deionized water, mixing the two solutions, stirring at room temperature, obtaining stable polylactic acid emulsion, subsequently,continuously stirring, after the solvent is volatilized, polylactic acid curing, filtering,washing and drying to obtain polylactic acid microspheres, preparing graphene oxide/polyethylene oxide dispersion liquid by ultrasonically stirring graphite oxide in deionized water to promote graphene oxide complete stripping and dispersion in water, forming a stable dispersion liquid, and adding polyethylene oxide powder. USE - The method is for preparation of high-barrier polylactic acid film containing three-dimensional barrier network. ADVANTAGE - The method provides high-barrier polylactic acid film with excellent oxygen barrier properties under extremely low oxide graphene content. It is simple and suitable for industrial production and has low production cost. DETAILED DESCRIPTION - Preparation of high-barrier polylactic acid film containing three-dimensional barrier network comprises providing raw materials i.e. polylactic acid, polyethylene oxide, and graphene oxide, and reagent i.e. emulsifier, water and dichloromethane, preparation of polylactic acid microspheres by dissolving polylactic acid at room temperature to obtain clear solution, adding water-soluble emulsifier into deionized water, mixing the two solutions, stirring at room temperature, obtaining stable polylactic acid emulsion, subsequently,continuously stirring, after the solvent is volatilized, polylactic acid curing, filtering,washing and drying to obtain polylactic acid microspheres, preparing graphene oxide/polyethylene oxide dispersion liquid by ultrasonically stirring graphite oxide in deionized water to promote graphene oxide complete stripping and dispersion in water, forming a stable dispersion liquid, adding polyethylene oxide powder, stirring and dissolving at room temperature to obtain graphene oxide/polyethylene oxide dispersion liquid, adding the polylactic acid microspheres into the dispersion liquid, heating and stirring, removing water by gradual volatilization, coating the polylactic acid microsphere surfaces with graphene oxide, obtaining graphene oxide/polyethylene oxide-polylactic acid composite microspheres, hot-press molding, and cooling to room temperature.