摘要:本文研究了聚氨酯（PU）微囊化聚磷酸銨（APP）膨脹型阻燃劑的制備及其在聚丙烯（PP）材料中的應用。使用一種異氰酸酯混合物（PMDI），與賽克（THEIC）在APP表面進行溶液聚合反應，制備膨脹型阻燃微膠囊（MCAPP）以及PP/MCAPP阻燃復合材料。對產物MCAPP進行紅外光譜、溶解度、熱失重等測試分析，對PP/MCAPP進行熱失重、相容性、阻燃性能、拉伸強度以及燃燒性能等測試分析。測試結果表明：MCAPP中出現明顯的聚氨酯特征峰；MCAPP的溶解度相比純APP降低了68.1%；初始分解溫度（T-5wt%）為291.5℃，比純APP有所降低；對APP進行包覆后可以提高PP/MCAPP復合材料的熱穩定性和相容性；加入MCAPP的PP/MCAPP復合材料的極限氧指數達到33；其最大熱釋放速率與PP相比下降70%，總熱釋放量下降17.7%。因此合成的微膠囊化膨脹型阻燃劑可以提高阻燃體系的阻燃性能與熱穩定性，同時相容性與力學性能也得到了提升。

關鍵詞：聚磷酸銨；賽克；微膠囊；耐水性；相容性

Abstract：This paper researched the microencapsulation of ammonium polyphosphate（APP） with a polyurethane shell and its application on polypropylene(PP). Using of theic and a mixture of diphenylmethane-4,4'-diisocyanate (MDI) prepare the microencapsule of APP by solution polymerization on the surface of APP.MCAPP was then incorporated into PP. The properties of the product were studied by using the fourier transform infrared(FT-IR), thermo gravimetric analysis(TGA),scanning electron microscopy(SEM)and cone calorimeter(CONE).The characteristic peaks of polyurethane appeared obviously. The water solubility of MCAPP decreased 68.1%. The product of the T-5wt% is 291.5℃，And MCAPP can enhance its thermal stability and compatibility of PP/MCAPP. The limiting oxygen index(LOI)values of the PP/MCAPP composites can reach 33. The composites’ HRR and THR decreased 70% and17.7%. Compared to APP, MCAPP possesses better flame retardancy and thermal stability, and the compatibility and tensile strength are improved．

Key words：Ammonium Polyphosphate；Theic；Microcapsule；water solubility；compatibility