Research On Recycling Of Retired SF-3 Propellants

Faced with the problems in detonation of perfusion explosives made with retired SF-3 propellants,foamed SF-3 propellants,which were synthesized by a two-stage batch foaming process in supercritical fluid CO2 with different saturation time and foaming temperature,were first used to make perfusion explosives.The foamed SF-3 propellants were characterized by scanning electron microscopy(SEM)to investigate the change of inner structure after foaming process and the effect of foaming process on it.From the electron microscope photograph,massive pores generated in the SF-3 propellants after foaming process,and the pores become larger as the saturation time increases,and also become larger as the foaming temperature rises.To investigate regularities of the polymerization of acrylamide in gaps of propellant grains,four propellants of different specifications were chosen to supply different polymerization conditions for acrylamide monomer.The relative molecular mass of the prepared polyacrylamide was tested by GPC.From the experiment data,the relative molecular mass of polyacrylamide reduces as the gap size of propellants decrease.The experiments detonation velocity test,underwater detonation and test-board detonation were carried out to investigate the detonation velocity,underwater detonation performance and test-board detonation performance of the perfusion explosives respectively,and effects of foaming process on detonation performance of them.From the results of experiments,after foaming process,perfusion explosives detonated and the detonation velocity exceeds 6000 m/s,but perfusion explosives using unfoamed SF-3 propellants did not detonate;after foaming process,the shock wave energy of perfusion explosive in underwater detonation were at least three times as those using unfoamed SF-3 propellants;after foaming process,the perfusion explosives penetrated A3 steel plate of 12-mm-thick,but those using unfoamed SF-3 propellants did not penetrated.The detonation performance of perfusion explosives using foamed SF-3 propellants was overall superior than those using unfoamed SF-3 propellants,because of the massive pores and hotspots generated in the SF-3 propellants.The detonation performance of perfusion explosives declines as the saturation time(exceeds 1h)in supercritical CO2 increases,and also declines as the foaming temperature rises.