In order to investigate the curing time of different curing agents used in casting polymer bonded explosives,Fourier trans-form infrared spectrometer,rotary rheometer and Shore A hardness tester were used to investigate the effects of toluene diisocyanate(TDI),dimeric acid diisocyanate(DDI)and TDI/DDI mixed curing agent on curing rate,pot life and curing time of pouring PBX slurry.The results show that the reaction rate of HTPB with different curing agents at 55 ℃ is kTDI＞kTDI/DDI＞kDDI,and the reaction follows the second-order reaction rule.For cast PBX slurry with high solid content,at a curing ratio of 1.2 and curing temperature of 55 ℃,using TDI curing agent,suitable pot life was 4 hours,curing time was 72 hours;Using DDI curing agent,pot life can reach more than 5 hours,but its curing time was 128 hours.Using TDI/DDI mixed curing agent,curing time is 96 hours,pot life can reach more than 5 hours,curing effect is more ideal.
pot lifecuring timetoluene diisocyanatedimer acid diisocyanatecasting PBX slurry
维普
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