Biodegradable PE-coated paper material and preparation method thereof

Abstract

The invention discloses a biodegradable PE-coated paper material which comprises the following components in percentage by weight: 60-90% of polylactic acid, 5-40% degradable toughening resin, 1-10% of elastomer, 0.1-1.0% of processing aid and 0.1-1.0% of anti-aging agent. According to the invention, the compatibility of the polylactic acid and elastic degrading resin can be improved, the adhesion of the material and paper is improved, and the cost of the existing degrading PE-coated paper raw material is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of new polymer materials, in particular to a biodegradable coated paper material and a preparation method thereof. Background technique [0002] The development of biodegradable polymer materials has become one of the important solutions to the depletion of petroleum resources and the "white pollution" caused by petroleum-based polymers, especially the development of biodegradable polymer materials derived from renewable crops. As a biodegradable polymer derived from renewable crops, polylactic acid (PLA) has the advantages of excellent mechanical properties, good biocompatibility, and easy molding and processing. Due to its safety and health, it is widely used in food contact. It has been widely used, and coated paper is a good application. The traditional polyethylene (PE) coated paper is easy to process, low in cost and high in efficiency, and occupies a dominant position in the coated paper material. Ho...

AI Technical Summary

Problems solved by technology

The traditional polyethylene (PE) coated paper is easy to process, low in cost and high in efficiency, and occupies a dominant position in the coated paper material. However, there are news reports that the instant noodle box made of PE coated paper is , there will be traces of low-molecular-weight PE wax oozing out, which cannot be digested and resolved by the human body after ingestion. Over time, it will be blocked in the intestinal tract, leading to serious diseases

[0003] The development of PLA coated paper is more conducive to the sustainable development of human health and the environment, but PLA coating also has many difficulties. PLA is a hard and brittle material, and its tensile and tear properties are not very good. When used for coated paper, It is not easy to bond, the thermal stability is not as good as PE, and the processing efficiency is not as good as that of PE coated paper. Therefore, it is necessary to modify PLA. The existing polybutylene adipate terephthalate (PBAT) modification is useful. PLA can realize the smooth production of coated paper, but the raw material cost of PBAT is high, and the aging resistance is poor. After a long time, the melting index of the purchased material increases a lot, and the strength of the material decreases, which makes it impossible to form a film when extruded on the coating machine. take shape

In addition, some manufacturers of degradable resins (such as PBAT, PBS, PPC, PHA, PBSA, etc.), in order to reduce costs and maintain the stability of blended materials, will also study blended polylactic acid, but polylactic acid and degradable toughening resin The compatibility of the resin is not good. If a large amount of degradable toughening resin is added, incompatibility will appear, and the comprehensive mechanical performance test data has not improved.