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

Abstract

The invention discloses a full biodegradable heat-resistant polylactic acid foaming material and a preparation method thereof. The full biodegradable heat-resistant polylactic acid foaming material consists of the following ingredients by weight percent: 90 to 95 percent of polylactic acid, 1 to 5 percent of PBAT resin, 0.1 to 3 percent of chain expander, 0.1 to 5 percent of nucleating agent and 0.1 to 3 percent of foaming additive. By adopting the foaming material, a continuous foaming technology can be realized, and a prepared foamed product has advantages of uniform size of bubbles and high rate of closed holes; moreover, the advantage of the polylactic acid biodegradation is maintained, the development requirement of the environment-friendly low-carbon sustainable economy can be completely met, and the full biodegradable heat-resistant polylactic acid foaming material has wide application market in the fields such as disposable lunch boxes, snack boxes, hamburger boxes, instant noodles bowels and packaging. The preparation method comprises the following steps: first drying polylactic acid, cooling polylactic acid, then adding other components, and uniformly mixing; then melting and blending the mixture in a dual-screw extruder, drawing bars, cooling the bars by air and cutting the bars into particles. The preparation method is simple, easy to control and implement, high in operability and easy in 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". In addition, due to the non-degradability of petroleum-based plastics, especially disposable petroleum-based foam lunch boxes, they have the characteristics of large production volume and large volume, causing serious "white pollution". The main method of disposal of petroleum-based plastics that cannot be recycled is incineration, which will greatly aggravate the greenhouse effect and smog weather. With the shortage of petroleum reso...

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.

Patents CN101362833B, CN102321269B, and CN104140659A disclose polylactic acid molded foaming or intermittent foaming technologies such as reactors. The molding process is complicated and the molding cycle is long, which is not conducive to industrial production.

CN103819885A discloses a polylactic acid foaming material and its preparation method, but by compounding petroleum-based plastics such as polyethylene or polypropylene, the advantages of biosource and biodegradability of polylactic acid are greatly sacrificed, and the problem cannot be completely solved. Petroleum dependence and white pollution hazards

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

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