丙烯酸酯橡胶对CL-20的包覆降感及改性

摘要

Using CL-20 as the main explosive, three types of acrylic rubber (ACM)(AR-71、AR-12、AR-14) and Estane 5703 as binder and dioctyl adipate (DOA) as plasticizer, the molecular dynamics simulation was conducted and then six kinds of CL-20-based PBXs were prepared by solution-water slurrying method and characterized by FE-SEM, XRD and DSC, and their impact sensitivities were tested.The results show that the plasticizer and ACM are coated on the surface of CL-20 crystal and the particles are spherical or ellipsoidal.CL-20 crystal is still ε type after being coated.The thermal stability of CL-20 is the best when CL-20 is coated by AR-71.The critical temperature of thermal explosion of CL-20 coated by AR-71 is 2.07℃ higher than that of CL-20 coated by Estane 5703.At the same time, the thermal stability of CL-20/AR-71 system is better than that of CL-20/AR-12 and CL-20/AR-14 in three types of CL-20 coated by the ACM.The binder AR-71 plays a very good role on reducing the sensitivity of CL-20.The introduction of plasticizer can effectively improve the thermal stability of CL-20/AR-71 and CL-20/Estane 5703 composite particles.The thermal stability and thermal safety of CL-20/AR-71/DOA system are the best, while the plasticizer also makes the mechanical sensitivity of CL-20/AR-71 and CL-20/Estane 5703 composite particles decrease.%以六硝基六氮杂异伍兹烷(CL-20)为主体炸药、分别以3种类型丙烯酸酯橡胶(ACM)(AR-71、AR-12、AR-14)和Estane 5703为黏结剂、以己二酸二辛酯(DOA)为增塑剂,进行分子动力学(MD)模拟.采用溶液-水悬浮法制备了6种CL-20基PBX,采用FE-SEM、XRD、DSC对其进行表征,并测试了其撞击感度.结果表明,ACM和增塑剂包覆在CL-20晶体表面,颗粒呈球形或椭球形,包覆后CL-20晶型仍为ε型.AR-71包覆的CL-20热安定性最好,热爆炸临界温度比Estane5703包覆的CL-20高2.07℃,同时在3种ACM包覆CL-20体系中,CL-20/AR-71体系的热安定性优于CL-20/AR-12和CL-20/AR-14.AR-71对CL-20降感起到很好的作用.增塑剂的引入有效改善了CL-20/AR-71和CL-20/Estane 5703复合粒子的热稳定性.其中CL-20/AR-71/DOA体系的热稳定性和热安全性最好,同时增塑剂也使CL-20/AR-71和CL-20/Estane5703复合粒子的机械感度降低.