In order to develop a binder system suitable for low temperature curing of PBX pouring explosives,epoxy hydroxy-terminated polybutadiene(EHTPB)was selected as binder.The viscosity changes with time at 45℃ of 5 kinds of curing agents including dimeric acid diisocyanate(DDI),toluene diisocyanate(TDI),hmethylene diisocyanate trimer(HDI trimer),isophor-one diisocyanate(IPDI)and diphenylmethane diisocyanate(MDI)were studied by viscosity growth method.The catalytic re-action effects of copper carbonyl compound(YKT),dibutyltin dilaurate(T12),triethylenediamine(DABCO),stannous capry-late(T9)and triphenylbismuth(TPB)on the EHTPB-DDI binder system were studied at 35℃.The curing reaction kinetics of EHTPB-DDI-YKT binder system was calculated by constant temperature rheological technique.The results show that DDI and IPDI have similar curing activity at 45℃,and both of them can be used as an ideal curing agent.At 35℃,the catalyst influ-ences the curing reaction rate of EHTPB-DDI in the following order:T12＞T9＞DABCO＞YKT＞TPB.Besides,the application period of YKT is 5.45 h with YKT added,which meets the curing process requirements.According to the reaction rate,the cu-ring reaction of EHTPB-DDI-YKT binder system is an autocatalytic reaction.It is calculated that the apparent activation energy of the binder system is 91.65kJ/mol and the reaction order is 0.836.The EHTPB-DDI-YKT binder system can effectively re-duce the curing temperature of the binder system and realize the low temperature curing of the EHTPB-based PBX pouring explo-sive.
维普
万方数据