通过添加二(1-硫代-1-磷杂-2,6,7-三氧杂双环[2,2,2]辛烷-4-亚甲基)二甲基硅烷(Si-SPEPA)与液态磷系阻燃剂磷酸三乙酯(TEP),制得不同磷硅配比阻燃硬质聚氨酯泡沫塑料(RPUF),并对其泡孔结构、阻燃性能、力学性能以及热性能等进行了分析。结果表明:P/Si=3.6为该磷硅协效阻燃RPUF体系的最佳比值,此时阻燃RPUF的泡孔结构较好,极限氧指数(LOI)为26.9%,冲击强度可达到0.152 kJ/m2,压缩强度为0.200 MPa,且此时700℃下的残炭率有明显提高,其值为44.2%。 (Si-SPEPA) by adding bis (1-thio-1-phospha-2,6,7-trioxabicyclo [2,2,2] octane-4-methylene) Liquid phosphorus-based flame retardant triethyl phosphate (TEP), different phosphorus and silicon flame retardant rigid polyurethane foam (RPUF), and its cell structure, flame retardant, mechanical properties and thermal properties were Analysis. The results show that P / Si = 3.6 is the best ratio of the flame retardant RPUF system. The cell structure of the flame retardant RPUF is better, the LOI is 26.9% and the impact strength can reach 0.152 kJ / m2, the compressive strength is 0.200 MPa, and the carbon residue rate at 700 ℃ increases obviously at 44.2%.