Novel polylactic acid and starch compound fully-degradable plastic film and manufacturing method thereof

Abstract

The invention discloses a novel polylactic acid and starch compound fully-degradable plastic film, which is characterized by being made from the following raw materials, by weight part, 80-85 of polylactic acid, 20-25 of corn starch, 12-14 of glycerin, 1.6-2 of epichlorohydrin, a proper amount of a sodium hydroxide solution with the concentration being 1 mol / L, a proper amount of hydrochloric acid with the concentration being 1 mol / L, a proper amount of distilled water, 25-30 of hemp fibers, 0.8-1 of a silane coupling agent kh-550 and 2-3 of talcum powder. The fully-degradable plastic film is excellent in toughness and mechanical properties, is easy to degrade under a natural condition and is safe and eco-friendly. The method is innovative in technology and convenient for industrial control. The film can be used as food package bags, preservative films, and the like.

Description

technical field [0001] The invention relates to the technical field of plastic films, in particular to a novel polylactic acid starch composite fully degradable plastic film and a preparation method thereof. Background technique [0002] In order to reduce the use of petroleum-based plastic materials, protect the environment, and alleviate the increasingly severe shortage of petroleum resources, the development and utilization of bio-based degradable and environmentally friendly plastic materials has become the focus of research in the field of packaging materials. [0003] Polylactic acid material is one of the most widely used degradable plastic materials at present. As a packaging film material, PLA has good transparency, mechanical properties and biocompatibility, high strength, thermoplasticity, hydrophobicity, easy molding and processing, and can be completely Degradation, the degradation products are non-toxic and harmless to the human body, come from renewable resour...

AI Technical Summary

Problems solved by technology

In the present invention, the silane coupling agent kh-550 is used to pretreat the hemp fiber, thereby improving the interface contact effect and compatibility, and improving the mechanical properties of the material; then modifying the cornstarch through a series of processes and adding In the overall product, it solves the problem of poor compatibility with polylactic acid, improves the strength and toughness of the composite material, and can greatly reduce the overall cost of the product, which is conducive to the promotion and application of fully biodegradable plastics