Heat-resistant polylactic acid composite material with short degradation cycle and preparation method of composite material

Abstract

The invention discloses a polylactic acid (PLA) composite material with a high degradation speed and a preparation method of the composite material. The composite material provided by the invention isprepared by adopting polylactic acid resin, PBAT resin, an inorganic filler, modified starch, an organic nucleating agent, a coupling agent, a chain extender, a compound photosensitive initiator, a thermal oxygen degradation initiator and a food-grade plasticizer, the heat resistance of the polylactic acid material is improved, and the use range of polylactic acid products is expanded; thermal degradation, photodegradation and hydrolysis speeds of wasted PLA products are increased, harsh conditions that require industrial composting are avoided, and the degradation speed faster than that of ordinary polylactic acid can be realized under natural conditions; the auxiliary agents used in the method are all food-grade raw materials and can be applied to food packaging; and the preparation method of the polylactic acid composite material with the high degradation speed provided by the invention employs simple equipment and is low in investment.

Description

technical field [0001] The invention relates to the field of biodegradable materials, in particular to a heat-resistant polylactic acid composite material with a short degradation period and a preparation method thereof. Background technique [0002] Today, with the theme of environment and sustainable development, environmentally friendly "green" polymer materials are increasingly favored by people. PLA (polylactic acid polylactic acid) is due to its outstanding contribution to reducing environmental pollution and saving petroleum resources. , in line with the requirements of sustainable development, while PLA has many advantages such as biodegradability, high strength and high modulus, high transparency and good biocompatibility, etc., and has broad application prospects in the fields of medicine, textiles, agriculture, clothing, etc. become a research hotspot. However, its poor heat resistance and brittleness seriously limit its application range. For example, PLA is no...

AI Technical Summary

Problems solved by technology

According to this definition, PLA is not a biodegradable material, because PLA is not easy to be completely degraded in the natural environment, but from the perspective of compostability, PLA is a degradable material, although studies have shown that proper control Under certain conditions, PLA can be degraded by a variety of microorganisms, and its degradation in natural environments is not very common, because most natural environments cannot meet the harsh conditions required for composting, so inventing a method that can be used in most natural environments A PLA material that achieves rapid and stable degradation is necessary

[0006] There are a large number of patent applications for photodegradable plastics, but they are all realized by adding photosensitizers on the basis of general-purpose non-degradable plastics. Even if ordinary polymer materials are added with photosensitizers, they cannot be completely degraded, and ordinary polymer materials are photosensitive. After decomposing, a large number of tiny particles will appear, causing secondary pollution of the soil

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