The invention discloses a renewable high-barrier
polyester packaging material and a preparation method thereof, and belongs to the technical field of
polymer processing and modification. According to the method, a
polyester A and a
polymer B are subjected to
compatibilization modification, the technical problem that the barrier property is poor due to compatibility of the two components is solved, the
polymer B of a dispersed phase forms a huge two-dimensional
sheet structure in situ by cooperatively controlling a specific two-way stretching process, the
diffusion path of gas small molecules in the film is greatly increased, the gas
permeability coefficient can be reduced by 1-2 orders of magnitude, and the two-dimensional filler and the in-situ formed two-dimensional polymer B are bridged to form a barrier network, so that the renewable high-barrier packaging material with a macroscopic single-layer, microcosmic multi-layer and multi-component special
microstructure is prepared, and the high-barrier packaging material can be obtained again through melt
processing by the method after molding, is easy to recycle, and has essential difference and remarkable progress compared with a traditional multi-layer
composite film.