▎ 摘　　要

NOVELTY - Producing an oxygen barrier material for a packaging material, involves (a) providing and forwarding a substrate material web, (b) providing an aqueous composition comprising graphene oxide comprising monolayer flakes of graphene oxide and multilayer graphene oxide platelets, stacked monolayer flakes of graphene oxide, (c) coating the aqueous composition of graphene oxide onto the surface of the substrate material web while being forwarded, (d) drying the wet coating of aqueous graphene oxide on the web, to obtain a first dry layer of layered graphene oxide particles or flakes, (e) applying an aqueous solution of a reducing agent onto the first dry layer of graphene oxide on the web, (f) following the step (e) drying the wet aqueous coating of the reducing agent, to obtain a second dry layer of reducing agent, and (g) allowing the reducing agent of the second dry layer to reduce the graphene oxide of the underlying, first dry layer, to form a barrier-coated substrate material web. USE - The method is useful for producing an oxygen barrier material for a packaging material used for liquid food packaging. ADVANTAGE - The method improves the adhesion strength to the layer of graphene oxide or reduced graphene oxide, and the produced packaging material has excellent oxygen gas barrier, for liquid food packaging for prolonged shelf-life and storage. DETAILED DESCRIPTION - Method for producing an oxygen barrier material for a packaging material, by coating a substrate material web with a layer of reduced graphene oxide, involves (a) providing and forwarding a substrate material web, (b) providing an aqueous composition comprising graphene oxide comprising monolayer flakes of graphene oxide and multilayer graphene oxide platelets, having up to 20, preferably 2-10, stacked monolayer flakes of graphene oxide, (c) coating the aqueous composition of graphene oxide onto the surface of the substrate material web while being forwarded, (d) drying the wet coating of aqueous graphene oxide on the substrate material web, by forced evaporation, to obtain a first dry layer of layered graphene oxide particles or flakes, (e) applying an aqueous solution of a reducing agent onto the first dry layer of graphene oxide on the substrate material web, (f) following the step (e) drying the wet aqueous coating of the reducing agent, by forced evaporation, to obtain a second dry layer of reducing agent, and (g) allowing the reducing agent of the second dry layer to reduce the graphene oxide of the underlying, first dry layer, during a minimum time at a minimum temperature, to form a barrier-coated substrate material web with the dry layer of reduced graphene oxide. INDEPENDENT CLAIMS are included for the following: (1) a barrier-coated substrate material web as obtained by the method, for use as oxygen barrier material in a laminated packaging material for liquid food products, comprising a substrate material substrate web and applied onto a dry layer from layered particles or flakes of reduced graphene oxide; (2) a laminated packaging material comprising the barrier-coated substrate web, and a first outermost protective material layer and a second innermost liquid tight, and heat sealable material layer; and (3) a packaging container comprising the laminated packaging material.