Full-biodegradable heat-resistant polylactic acid foaming material and preparation method thereof

Abstract

The invention discloses a fully biodegradable heat-resistant polylactic acid foaming material and a preparation method thereof, comprising 85-90% by weight of polylactic acid, 1-10% of PBAT resin, 0.1-3% of a chain extender, and 0.1% of a nucleating agent. ~5%, 0.1~5% foaming aid. Continuous foaming technology can be realized by using this foaming material. The prepared foamed product has the advantages of uniform cell size and high closed cell rate, and maintains the advantages of polylactic acid biodegradation, which is fully in line with the development of green, low-carbon and sustainable economy. It has a broad application market in the field of disposable lunch boxes, fast food boxes and hamburger boxes, instant noodle bowls and packaging. The preparation method of the present invention: first dry the polylactic acid, add other components after cooling and mix uniformly; then add it to a twin-screw extruder for melt blending, and then pull strands, air-cool, and pelletize to obtain. The preparation method is simple, easy to control and implement, strong in operability, and easy to industrialized production.

Description

technical field [0001] The invention relates to the technical field of heat-resistant polylactic acid material and its preparation, in particular to a fully biodegradable heat-resistant polylactic acid foam material and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, plastics have penetrated into various fields of the national economy. However, most of the plastics currently used are derived from petroleum, which greatly exacerbates the problem of "shortage of petroleum resources". Polylactic acid is the only biological resource as raw material, which has good biocompatibility, degradability, high tensile strength and compression modulus, so polylactic acid is considered to be a substitute for petroleum-based plastics. Applying it to the field of general-purpose plastics is of great significance for reducing environmental pollution, saving oil resources and alleviating the global warming effect. The shortage of p...

AI Technical Summary

Problems solved by technology

These technical solutions can improve the foaming performance of PLA to a certain extent, but they are basically still in the experimental stage

U.S. patents US20080262118 and US20110263732 have prepared polylactic acid foamed materials by using composite D-configuration PLA, but the foam size is large, the opening rate is high, the foaming process is high-precision, and the cost is high, so it is difficult to realize industrial production