A fully degradable high barrier composite material for flexible packaging

Abstract

The invention relates to a fully degradable high-barrier composite material for flexible packaging, which is mainly prepared by blending the following components in parts by weight: 100 parts of biodegradable matrix resin; 0-30 parts of inorganic filler; 0.1-15 parts of auxiliary agent share. Preferably, the composite material is composed of an inner biodegradable matrix resin and an outer biodegradable matrix resin through double-layer co-extrusion. In parts by weight, the inner biodegradable matrix resin includes: 10-90 parts of PBAT, 10-90 parts of PCL, 0.1-5 parts of auxiliary agents, wherein the total parts by weight of PBAT and PCL is 100 parts; Said outer layer biodegradable matrix resin comprises: 10-90 parts of PBAT, 10-90 parts of PLA, 1-20 parts of inorganic filler, 0.1-8 parts of auxiliary agent; wherein, the total parts by weight of PBAT and PLA is 100 parts; all The inorganic filler is nanometer calcium carbonate or talcum powder.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a fully degradable high-barrier composite material for flexible packaging and a preparation method thereof. Background technique [0002] At present, plastic packaging materials are becoming more and more popular. Plastic packaging materials are mainly made of polyethylene, polyester or polypropylene. The main advantage of plastic containers blown, extruded or injection molded through plastic molds is corrosion resistance. Low cost, easy to carry and diverse shapes, etc. For example, liquid packaging film belongs to soft plastic packaging, which plays an important role in packaging liquid foods such as soy sauce, vinegar, alcohol, non-carbonated beverages, and milk. Film materials used for liquid food packaging should meet the requirements of packaging, printing, processing, storage, transportation and sanitation. The liquid packaging film that ca...

AI Technical Summary

Problems solved by technology

[0010] Invention patent 201410733882.2 invented a method for preparing a high-toughness polycarbonate / polylactic acid-based alloy. The blend system of the two solves the problems of insufficient brittleness and poor heat resistance of PLA, but the introduction of polycarbonate can make PLA The advantage of complete degradation is reduced, and only partial degradation can be achieved, and the source of polycarbonate raw materials also consumes petroleum resources to a certain extent, which is not friendly to the environment

[0011] Invention patent CN109955555A has relatively high requirements for liquid food packaging film for heat sealability and barrier properties (especially for oxygen and aroma barrier properties). At present, there is no biodegradable plastic packaging film that meets the needs of liquid food packaging in the market problem, discloses a biodegradable high-barrier liquid packaging film

[0014] However, the degradable biocomposites in the prior art are all single-layer composite structures, but have a double-layer structure. By endowing each layer with different functions, the composite material has both excellent high barrier properties and full biodegradability. And low-cost fully degradable biocomposites have not been reported yet