A bio-based intumescent flame retardant (denoted as PIMEPA@ATH) was synthesized via metal chelation using water as the media. The PIMEPA@ATH complex aggregations was used to improve the flame retardancy of ethylene-vinyl acetate copolymer (EVA) by synergistic combination of piperazine-melamine phytate complex (denoted as PIMEPA) and aluminum hydroxide (ATH). During combustion, the in-situ growth of crystalline aluminum metaphosphate arising from PIMEPA@ATH helped to cast more compact protective barriers containing metal ions and aromatic rings. The results showed that the EVA sample containing 30 wt% PIMEPA@ATH achieved the UL-94 V0 rating without dripping in the vertical burning test and a reduction of 79% in peak heat release rate and 58% reduced peak smoke production rate in the cone calorimeter test. Moreover, the tensile properties of EVA/PIMEPA@ATH were improved compared with the EVA/PIMEPA control. Better char formation and improved interfacial adhesion were primarily responsible for the enhancements in flame retardancy and mechanical performance. This work demonstrated the flame-retardant mechanism of PIMEPA@ATH, and explored a facile and green “chelate-mediated” strategy for synthesis of bio-based and ATH chelate-mediated intumescent flame retardant.

以水为介质，通过金属螯合合成了一种生物基膨胀型阻燃剂（表示为 PIMEPA@ATH）。PIMEPA@ATH复合聚集体通过哌嗪-三聚氰胺植酸盐复合物（表示为PIMEPA）和氢氧化铝（ATH）的协同组合来提高乙烯-醋酸乙烯共聚物（EVA）的阻燃性。在燃烧过程中，由 PIMEPA@ATH 产生的结晶偏磷酸铝的原位生长有助于铸造更紧凑的包含金属离子和芳环的保护屏障。结果表明，含有 30 wt% PIMEPA@ATH 的 EVA 样品在垂直燃烧测试中达到了 UL-94 V0 等级，且无滴落，峰值放热率降低 79%，锥体峰值发烟率降低 58%热量计测试。而且，与 EVA/PIMEPA 对照相比，EVA/PIMEPA@ATH 的拉伸性能得到改善。更好的炭形成和改善的界面粘附力是提高阻燃性和机械性能的主要原因。这项工作证明了 PIMEPA@ATH 的阻燃机制，并探索了一种简便、绿色的“螯合介导”合成生物基和 ATH 螯合介导的膨胀型阻燃剂的策略。