食品接触用聚乳酸降解性及其中的化学物质迁移

目的 介绍食品接触用聚乳酸(PLA)的降解行为及其中的化学物质的迁移情况,为食品接触用PLA的安全性和环保性,以及完善相关法规提供资料.方法 对PLA的特性,食品接触用PLA中重金属、添加剂和低聚物的迁移,PLA及其复合材料的降解等方面进行分析和总结.结果 PLA不仅有与传统塑料一样的安全隐患,还具有其自身降解产物迁移带来的安全问题.PLA的降解性受到多种因素的影响,除了受到自身性质的影响,还与共聚物的性质有关.结论 目前食品接触用PLA仍存在多种挑战,随着食品接触用PLA越来越广泛的应用,对其安全性和环保性进行深入研究非常必要.

Degradability of Polylactic Acid for Food Contact and the Migration of Its Chemical Substances

The work shows the research related to the degradation behaviour of PLA for food contact and the migration of its chemical substances. The work aims to provide information for the safety and environmental protection of polylactic acid (PLA) for food contact and the improvement of relevant laws and regulations. In addition in the work, the characteristics of PLA, the migration of heavy metals, additives and oligomers in PLA for food contact, and the degradation of PLA together with its composites are analyzed and summarized. Results show that PLA not only bears the same potential safety hazards as traditional plastics, but also has the safety problems caused by the migration of self-degradation products. The degradability of PLA is affected by a variety of factors, not only by its own properties, but also by the properties of copolymers. Conclusions could be drawn that there are still many challenges in the utilization of PLA for food contact. With the increasingly extensive application of PLA for food contact, it is necessary to carry out in-depth research on its safety and environmental protection.