Fully biodegradable component-toughened PLA composite material and preparation method thereof

Abstract

The invention discloses a fully biodegradable component-toughened PLA composite material and a preparation method thereof. The material is prepared from, by weight, 66-95.9 parts of polylactic acid, 3-15 parts of an alginic acid natural polymer, 1-18 parts of vegetable oil or derivatives thereof and 0.1-1.0 part of an alkaline catalyst. The preparation method comprises the following steps of drying the components, conducting blending and granulating in an internal mixer, then putting granules into an extruder for extrusion, and performing injection molding by an injection molding machine. Thecomposite material has the advantages that the production cost is low, the material is biodegradable, a plasticizer is unlikely to permeate and migrate, no pollution is caused, a good toughening effect is achieved, and the mechanical property is excellent.

Description

technical field [0001] The invention relates to a PLA composite material and a preparation method thereof, in particular to a fully biodegradable component toughened PLA composite material and a preparation method thereof. Background technique [0002] Due to the problems of excessive consumption of resources and environmental pollution caused by petroleum-based polymers, the demand for biodegradable polymers, especially those derived from bio-based raw materials, has been increasing in recent years. Polylactic acid (PLA) is a promising alternative to fossil-based polymers due to its inherent advantages such as biodegradability, renewability, biocompatibility, high mechanical strength, high melting temperature, and ease of processing , has received more and more attention. As a biodegradable polymer, polylactic acid has become a research hotspot because of two reasons: on the one hand, the synthetic monomer lactic acid of polylactic acid is made from renewable plant resourc...

AI Technical Summary

Problems solved by technology

However, due to the immiscibility between the vegetable oil and the PLA matrix, the toughening effect of direct blending is not good; although reactive blending provides a powerful improvement method, it is not compatible with other toughened PLA components. ratio, its toughening effect is still quite insufficient

Therefore, the preparation of super-tough PLA / vegetable oil composites remains a challenge

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