Polyethylene (PE) modification to have flame retardant and anti-dripping capabilities is indispensable for public safety and environmental protection. To the end, PE modification with flame retardant resorcinol bis(diphenyl phosphate) (RDP) is suggested but a poor compatibility of PE with RDP is problematic. In this work, a microencapsulation of RDP using melamine-urea-formalin resin as shell material was proposed to resolve the compatibility problem, making PE composites with microencapsulated RDP (MCRDP), red phosphorus (MCRP) and magnesium hydroxide (MH). Through the material characterization, it was found that the spherical MCRDP particles were fabricated in homogeneous distribution of particle sizes. The flame retardance of the PE composite samples with different compositions was tested according to the UL-94 method, finding that the PE/20%MCRDP/5%MCRP/5%MH composite has the best performance. Moreover, the thermogravimetric analysis showed that this composite exhibited higher decomposition temperature than pure PE and PE/30%MCRDP composite, revealing the P-N synergy effect on improving the flame retardance of PE composites.

聚乙烯（PE）改性使其具有阻燃和抗滴落能力对于公共安全和环境保护是必不可少的。最后，建议用阻燃剂间苯二酚双(二苯基磷酸酯)(RDP)对PE进行改性，但PE与RDP的相容性较差。为了解决相容性问题，提出了以三聚氰胺-脲-福尔马林树脂为壳材料微胶囊化RDP，制备了微胶囊化RDP（MCRDP）、红磷（MCRP）和氢氧化镁（MH）的PE复合材料。通过材料表征，发现所制备的球形MCRDP颗粒的粒径分布均匀。按照UL-94方法测试不同成分PE复合材料样品的阻燃性能，结果发现PE/20%MCRDP/5%MCRP/5%MH复合材料具有最佳性能。此外，热重分析表明，该复合材料表现出比纯PE和PE/30%MCRDP复合材料更高的分解温度，揭示了PN对提高PE复合材料阻燃性的协同作用。