The flame‐retardant microcapsules were successfully fabricated with an aluminum hypophosphite (AHP) core. Fourier transform infrared (FTIR) and X‐ray photoelectron spectroscopy (XPS) were used to verify that AHP was encapsulated in the microcapsules, and thermogravimetry analysis showed that microencapsulated AHP (MAHP) possessed higher thermal stability than that of AHP. Then, a flame‐retardant and smoke suppression system for silicone foams (SiFs) was obtained through a synergistic effect of MAHP and zinc borate (2ZnO·3B₂O₃·3.5H₂O). The mechanical properties, flame retardance, and smoke suppression of SiFs with MAHP and zinc borate were tested using the tensile test, limiting oxygen index (LOI) test, UL‐94 test, and cone calorimeter test. The mechanical properties indicated that the tensile strength and elongation at break of SiFs could evidently improve with the incorporation of MAHP. Compared with pure SiF, SiF8 with 4.5‐wt% MAHP and 1.5‐wt% zinc borate could achieve an LOI value of 30.7 vol% and an UL‐94 V‐0 rating, the time to ignition amplified almost six times, the peak heat release rate and total heat release were 51.10% and 46.00% less than that of pure SiF, respectively, the fire performance index increased nearly 13 times, and the fire growth index value was only 13.18% of pure SiF. Moreover, the partial substitution of zinc borate imparted a substantial improvement in both flame retardancy and smoke suppression. Especially, the peak smoke production rate and total smoke production of SiF8 were merely 38.46% and 38.84% of pure SiF.

中文翻译：

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微囊次磷酸铝和硼酸锌对有机硅泡沫的阻燃和抑烟作用

阻燃微胶囊是用次磷酸铝（AHP）核心成功制造的。用傅立叶变换红外（FTIR）和X射线光电子能谱（XPS）验证了AHP被封装在微胶囊中，热重分析表明微胶囊化AHP（MAHP）具有比AHP更高的热稳定性。然后，通过MAHP和硼酸锌（2ZnO·3B ₂ O ₃ ·3.5H ₂）的协同作用，获得了一种用于硅泡沫（SiFs）的阻燃和抑烟系统。O）。使用拉伸试验，极限氧指数（LOI）试验，UL‐94试验和锥形量热仪试验测试了MAHP和硼酸锌对SiF的机械性能，阻燃性和抑烟性。力学性能表明，随着MAHP的加入，SiFs的拉伸强度和断裂伸长率明显提高。与纯SiF相比，具有4.5wt％MAHP和1.5wt％硼酸锌的SiF8的LOI值可达到30.7 vol％，UL-94 V-0等级，点火时间几乎放大了六倍，峰值热量释放速率和总放热分别比纯SiF降低51.10％和46.00％，其防火性能指数提高了近13倍，而火灾增长指数值仅为纯SiF的13.18％。此外，硼酸锌的部分替代在阻燃性和抑烟性上都得到了实质性的改善。特别是，SiF8的峰值烟雾产生率和总烟雾产生率仅为纯SiF的38.46％和38.84％。