A novel silicon, phosphorus and nitrogen synergistic flame retardant, aminoethylpiperazine phosphoric acid methyl ester modified siloxane (EPSO-P) was synthesized, the structure of EPSO-P was confirmed by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). The limiting oxygen index (LOI) value of cotton fabrics treated by EPSO-P increased to 31.4 %, and passed the vertical flammability test (VFT) with a residual char length of 6.3 cm. The thermal stability of samples is obviously improved after processing, and the char residue maintained 43 % at 700 °C in nitrogen atmosphere. The burning behavior of cotton fabrics showed that the peak heat release rate decreased from 232.1 kW/m² to 74.5 kW/m², and the total heat release decreased from 6.3 MJ/m² to 2.8 MJ/m² after flame retardant treatment. The flame retardant mechanism of the samples was analyzed by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and thermogravimetric analysis coupled with fourier transform infrared analysis (TG-FTIR). The results indicated that the EPSO-P can prevent the fabrics from burning in gas phase and condensed phase. This work proved that EPSO-P is enlightening for the production of flame retardant cotton fabrics with considerable properties.

合成了一种新型硅磷氮协同阻燃剂氨基乙基哌嗪磷酸甲酯改性硅氧烷（EPSO-P），EPSO-P的结构经傅里叶变换红外光谱（FTIR）和核磁共振（NMR）证实。经EPSO-P处理的棉织物的极限氧指数（LOI）值提高到31.4%，并通过了垂直燃烧试验（VFT），残留炭长为6.3 cm。处理后样品的热稳定性明显提高，700℃氮气氛下炭渣保持43%。棉织物的燃烧行为表明，峰值放热率从232.1 kW/m ²下降到74.5 kW/m ²，总放热从6.3 MJ/m ²下降阻燃处理后²～2.8 MJ/m ²。通过扫描电子显微镜（SEM）、能量色散光谱（EDS）、热重分析结合傅里叶变换红外分析（TG-FTIR）对样品的阻燃机理进行了分析。结果表明EPSO-P可以防止织物在气相和凝聚相中燃烧。这项工作证明EPSO-P对于生产具有相当性能的阻燃棉织物具有启发意义。