Fully-degradable plastic film having fresh keeping function and used for packages and preparing method thereof

Abstract

Fully-degradable plastic film having a fresh keeping function and used for packages is disclosed. The plastic film is characterized in that the plastic film is prepared from 80-85 parts by weight of polylactic acid, 25-30 parts by weight of China hemp fibers, 0.8-1 part by weight of a silane coupling agent kh-550, 20-25 parts by weight of corn starch, 12-14 parts by weight of glycerin, 1.6-2 parts by weight of epichlorohydrin, a proper amount of a sodium hydroxide solution having a concentration of 1 mol/L, a proper amount of hydrochloric acid having a concentration of 1 mol/L, a proper amount of distilled water, 5-6 parts by weight of porous starch, 1-2 parts by weight of magnesium stearate, 3-4 parts by weight of macroporous silica gel and 5-7 parts by weight of tourmaline powder; the plastic film is scientific and reasonable in component ratio, can be prepared into food fresh keeping film or fruit packaging bags, and the like, contains the tourmaline powder and other components, can emit far infrared light and negative ions, and keeps freshness for foods; a process is innovative and convenient in industrial control; and the plastic film is low in cost and wide in source and deserves popularization.

Description

technical field [0001] The invention relates to the technical field of plastic films, in particular to a fully degradable plastic film for packaging with a fresh-keeping function 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 r...

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, the problem of poor compatibility with polylactic acid is solved, and the strength and toughness of the composite material are improved at the same time; finally, coarse-porous silica gel, tourmaline powder, porous Starch, etc., synergistically release far-infrared rays, which have a fresh-keeping effect on packaged products, can greatly reduce the overall cost of products, and contribute to the promotion and application of fully biodegradable plastics