Biodegradable high-barrier composite film material structure and packaging bag thereof

Abstract

The invention provides a biodegradable high-barrier composite film material structure. The composite film material sequentially comprises a cellulose layer, a pure aluminum layer, a PBAT layer, a first adhesive layer clamped between the PBAT layer and the pure aluminum layer, and a second adhesive layer clamped between the pure aluminum layer and the cellulose layer from top to bottom, wherein the PBAT layer, the first adhesive layer, the pure aluminum layer, the second adhesive layer and the cellulose layer are combined together through a composite film forming technology. The cellulose layer with printing adaptability, temperature resistance, poor extensibility and no heat sealability and the pure aluminum with high barrier property are compounded together through the second adhesive layer, and then are compounded together with the PBAT layer with heat sealability and extensibility through the first adhesive layer, so that the properties of the cellulose layer and the PBAT layer are complementary, and the composite film material which is good in surface wetting tension, resistant to temperature, capable of being subjected to heat sealing and capable of meeting the performance requirements of low-temperature freezing, high-barrier conditions and the like can be prepared. The degradation rate of the degradable part is 90% or above, and energy saving and environment friendliness are achieved.

Description

technical field [0001] The invention relates to the technical field of degradable composite film materials, in particular to a degradable high-barrier composite film material structure and a packaging bag thereof. Background technique [0002] At present, in an environment where plastic pollution is increasingly serious, biodegradable packaging is a good way to solve plastic pollution. Biodegradable packaging gradually replaces traditional non-degradable packaging. Degradable and compostable film materials are currently mainly used in single-layer film applications. The physical and mechanical properties of a single layer cannot meet more functional requirements, and the raw materials of fully biodegradable and compostable films are mostly derived from natural materials, which have advantages and disadvantages in performance. Packaging applications that cannot meet diverse needs. Contents of the invention [0003] The purpose of the present invention is to overcome the de...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, solve the deficiencies in the barrier properties of degradable materials in terms of moisture permeability and oxygen permeability, and provide a degradable plastic that solves the problem of non-degradable plastics polluting the environment while satisfying functional packaging applications. High-barrier composite film material structure and its packaging bags expand the scope of application

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