The introduction of flame retardants often decreases the ultraviolet (UV) resistance ability of the photo stabilizer. In this work, the antagonistic effect between APP and a light stabilizer HLAS770 was investigated, and the microencapsulated APP (Si-APP) was prepared by coating ammonium polyphosphate (APP) with polysiloxane. Si-APP was introduced into polypropylene (PP) in association with a light stabilizer bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate (HALS770) to synchronously improve both the photo-aging resistance and flame retardancy. The characterization of surface topography, carbonyl index, and mechanical properties demonstrated that the antagonistic effect between APP and HALS770 was eliminated by the presence of polysiloxane. The limiting oxygen index and cone calorimeter test results revealed that the heat and smoke release of aged PP composites containing Si-APP and HALS770 was decreased by 28% and 35% respectively, compared with that of the aged control PP sample, which is crucial to the practical application of PP. It was proved that polysiloxane and HALS770 synergistically improved the photo-aging resistance and flame retardancy of PP. It is suggested that this work provides a new strategy for fabricating long-life flame retardant polypropylene composites.

阻燃剂的引入往往会降低光稳定剂的抗紫外线（UV）能力。在这项工作中，研究了APP与光稳定剂HLAS770之间的拮抗作用，并通过用聚硅氧烷包覆聚磷酸铵（APP）制备了微胶囊化APP（Si-APP）。将 Si-APP 与光稳定剂双 (2,2,6,6-四甲基-4-哌啶基)癸二酸酯 (HALS770) 一起引入聚丙烯 (PP) 中，以同时提高耐光老化性和阻燃性。表面形貌、羰基指数和机械性能的表征表明，聚硅氧烷的存在消除了 APP 和 HALS770 之间的拮抗作用。极限氧指数和锥形量热仪测试结果表明，与老化的对照 PP 样品相比，含有 Si-APP 和 HALS770 的老化 PP 复合材料的放热和排烟量分别降低了 28% 和 35%，这对于PP的实际应用。事实证明，聚硅氧烷和HALS770协同提高了PP的耐光老化性和阻燃性。建议这项工作为制造长寿命阻燃聚丙烯复合材料提供了新的策略。