▎ 摘　　要

NOVELTY - Gas and moisture permeable film comprises support layer and functional layer, where the functional layer exists on one side of the support layer or on both sides of the support layer. The support layer is a porous polyolefin film, and the functional layer comprises a first functional layer attached to support layer and second functional layer attached to the first functional layer. The first functional layer comprises polydopamine, inorganic nanoparticles and an optional antibacterial agent. The second functional layer comprises polyamine polymer and sulfonate salt containing an amino group. USE - Gas and moisture permeable film used in vegetable and fruit fresh-keeping package (claimed). ADVANTAGE - The gas and moisture permeable film has gas-proof and moisture-permeable ability, when the relative humidity is high, then the moisture permeability prevent fruit and vegetable from condensation and ulceration, and rapid decay of fruits and vegetables under oxygen. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for producing gas-and moisture-permeable film, involves: (A) dissolving or dispersing dopamine and other components of the first functional layer into a Tris-HCl buffer solution with the pH value of 8-10 to prepare a solution or dispersion liquid; (B) attaching the solution or dispersion liquid obtained to one surface or two surfaces of the supporting layer to form a first functional layer on the surface of the supporting layer; and (C) contacting the surface of the first functional layer obtained with a solution containing polyamine polymer and sulfamate to obtain the gas-and moisture-permeable film.