The synthesis of bio-based high-efficiency flame retardants in accordance with green and facile method is critical yet very challenging for bioplastics, e.g., poly (lactic acid) (PLA). In this study, a bio-based flame retardant named as PF is synthesized by the reaction between phytic acid (PA) and furfurylamine (FA) in water. PF improves the flame retardancy of PLA at low addition. For instance, PLA composite containing only 2 wt% PF passes a UL-94 V-0 classification, and that containing 4 wt% PF exhibits a limiting oxygen index (LOI) of 28.5%, which is 46.2% higher than that of pure PLA. PF slightly reduces the peak heat release rate (PHRR) and total heat release (THR) of PLA in cone calorimeter test (CCT). In detail, 4 wt% PF reduces the PHRR from 362.2 kW/m² to 332.7 kW/m² by 8%. Additionally, PLA/PF composite is comparable to the neat PLA in terms of mechanical properties and thermal stability when a UL-94 V-0 rating is achieved. The flame-retardant mechanism analyses demonstrate that PF takes action in both gaseous and condensed phases. It is proposed that PF accelerates the generation of melting droplets to take away heat, suppresses the release of combustible gases and improves the compactness of char layer during combustion. This study provides a green and facile strategy to create bio-based high-efficiency flame retardants for the preparation of fire-safe bioplastics holding a promising future in the industry.

根据绿色简便的方法合成生物基高效阻燃剂对于生物塑料（例如聚乳酸（PLA））至关重要，但也极具挑战性。在这项研究中，通过植酸 (PA) 和糠胺 (FA) 在水中的反应合成了一种名为 PF 的生物基阻燃剂。PF在低添加量下提高了PLA的阻燃性。例如，仅含 2 wt% PF 的 PLA 复合材料通过了 UL-94 V-0 分类，而含 4 wt% PF 的 PLA 复合材料的极限氧指数 (LOI) 为 28.5%，比纯 PLA 高 46.2% . 在锥形量热仪测试 (CCT) 中，PF 略微降低了 PLA 的峰值放热率 (PHRR) 和总放热率 (THR)。详细地说，4 wt% PF 将 PHRR 从 362.2 kW/m ^{2 降低}到 332.7 kW/m²乘以 8%。此外，当达到 UL-94 V-0 等级时，PLA/PF 复合材料在机械性能和热稳定性方面可与纯 PLA 相媲美。阻燃机理分析表明，PF 在气相和凝聚相中都起作用。提出PF加速熔滴的产生带走热量，抑制可燃气体的释放，提高燃烧过程中炭层的致密性。该研究为创建生物基高效阻燃剂提供了一种绿色简便的策略，用于制备在行业中具有广阔前景的防火生物塑料。