六(4-醛基苯氧基)环三磷腈对三元乙丙包覆层性能的影响

Influence of hexa(4-aldehydephenoxy) cyclotriphosphazene on EPDM inhibitor for solid rocket propellant

以六(4-醛基苯氧基)环三磷腈(HAPCP)为有机填料,研究了其对三元乙丙橡胶(EPDM)包覆层力学性能、耐高温和耐烧蚀性能、阻燃性能以及与推进剂的粘结性能的影响。通过实验结果可以看出,添加HAPCP的EPDM包覆层与推进剂药柱粘接性良好;随着HAPCP添加量的增加,EPDM包覆层的拉伸强度不断增大,而延伸率则随之下降;耐高温和耐烧蚀性能也随着HAPCP添加量的增加而显著提高,线烧蚀率由0. 18 mm/s下降至0. 148~0. 088 mm/s,800℃的残焦量由5. 24%最大可升高至51. 09%;当HAPCP添加量增至4 g/100 g EPDM以上时,EPDM包覆层的极限氧指数大于27%,属难燃材料。

Hexa(4-aldehydephenoxy)cyclotriphosphazene(HAPCP)is prepared as an organic filling and its influence on EPDM inhibitor,including mechanical properties,heat-and ablative-resistance,flame retardancy and binding properties,are studied.Through experiments on ten formulas,it can be found that EPDM inhibitor appending HAPCP possesses superior binding properties with solid rocket propellant.With increasing content of HAPCP,the tensile strength of EPDM inhibitor shows an upward trend whereas the elongation decreases,the linear ablation rate falls from 0.18 mm·s-1 to 0.148-0.088 mm·s-1 and the maximum char yield at 800oC increases from 5.24%to 51.09%.In addition,limiting oxygen index of EPDM inhibitor exceeds 27%when the content of HAPCP is more than 4 g per 100 g EPDM,indicating that EPDM inhibitor can be assigned to nonflammable material.