Degradable foamed co-extruded PET barrier film

Abstract

The invention relates to a degradable foamed co-extruded PET barrier film. The degradable foamed co-extruded PET barrier film is characterized in that materials of all layers in the laminated film have approximately-consistent biodegradability through introducing biological groups, and the added amount of an additive master batch in the materials of each layer is controlled to be 0.3-15% the total mass of the materials of the corresponding layer; the hydrophilic activity of hydrophilic groups in the additive master batch needs to be greater than or equal to that of the hydrophilic groups in the materials of each layer; through adding the additive master batch, the mole ratio of the hydrophilic groups and carbon atoms of the materials of each layer is approximately consistent, namely that the biological activity is approximately consistent, so that the degradation rate of the materials of all the layers in the laminated film is approximately consistent. The degradable foamed co-extruded PET barrier film has the contributions that through balancing the mole ratio of the hydrophilic groups and carbon atoms of the materials of each layer, the approximately-consistent biological activity and approximately-consistent biodegradation rate are obtained, and the appearance, functions and physical and mechanical properties of products are kept invariable.

Description

technical field [0001] The invention relates to the technical field of multilayer composite films, in particular to a biodegradable and degradable foamed co-extruded PET barrier film. Background technique [0002] Multi-layer co-extruded composite film refers to a film compounded by a variety of different polymers by co-extrusion blow molding, co-extrusion casting or co-extrusion stretching. As a plastic packaging material, this film is widely used in food, processed meat products, daily necessities, cosmetics, chemical products, pesticides, military products, etc. Packaging function, with various barrier properties such as high moisture resistance, oxygen resistance, oil resistance, and fragrance retention in various environments. [0003] With the use of a large number of composite films in various fields, the pollution of composite films to the environment is increasing day by day. Because it is difficult to degrade, the pollution caused by the composite film has become...

AI Technical Summary

Problems solved by technology

At present, some traditional methods for dealing with composite film waste, such as incineration, landfill, recycling, etc., have defects, and have certain limitations that bring serious load to the environment. Therefore, the development of biodegradable composite films that reduce environmental pollution is a solution to the environment. important way of pollution

[0004] As far as the applicant knows, the biodegradation technology and application technology of the composite film with the same degradation rate is still a blank, and there are no relevant reports at home and abroad.