Polylactic acid (PLA) is one of the solutions to the white pollution and energy crisis. However, the using performance (such as flame retardant, weather resistance and mechanical properties) and recycling performance limit its wide application. In this work, a bio-based additive (PA-Fe-HBT) with core–shell structure is synthesized by tannins microspheres and phytic acid (PA). By the presence of 3 wt% PA-Fe-HBT, the limited oxygen index is increased to 25.5%, and the sample can pass UL-94 V-0 grade. At the same time, the mechanical properties of the composites remain good. Besides, the ultraviolet aging resistance and ultraviolet protection ability of the composite are significantly improved. The ultraviolet (UV) transmittance of PLA/3%PA-Fe-HBT sample shows a decrease of 99.97% compared with control PLA. More importantly, the chemical recycling of composites is promoted by PA-Fe-HBT in the absence of external heating. After a simple purification, 88% purity of lactic acid is obtained. It is believed that this work proposes an ingenious design strategy to prepare PLA/PA-Fe-HBT composites with flame-retardancy, UV resistance and chemical recycling performances.

聚乳酸（PLA）是解决白色污染和能源危机的解决方案之一。但其使用性能（如阻燃、耐候、机械性能）和回收性能限制了其广泛应用。在这项工作中，由单宁微球和植酸（PA）合成了具有核壳结构的生物基添加剂（PA-Fe-HBT）。通过3wt% PA-Fe-HBT的存在，极限氧指数提高至25.5%，样品可通过UL-94 V-0级。同时，复合材料的机械性能保持良好。此外，复合材料的抗紫外线老化和紫外线防护能力显着提高。PLA/3%PA-Fe-HBT样品的紫外（UV）透过率与对照PLA相比下降了99.97%。更重要的是，在没有外部加热的情况下，PA-Fe-HBT促进了复合材料的化学回收。经过简单的提纯，得到纯度88%的乳酸。据信，这项工作提出了一种巧妙的设计策略来制备具有阻燃、抗紫外线和化学回收性能的PLA/PA-Fe-HBT复合材料。