Design and Application of Binder System for Castable Polymer Bonded Explosive

In order to improve the solid content and mechanical properties, and decrease the plasticizer migration of hydroxyl terminated polybutadiene (HTPB) based castable polymer bonded explosive (PBX), a compound plasticizer (AI) was designed according to the approximation principle of solubility parameter using dioctyl adipate and isodecyl pelargonate as substances. The solid phase content of castable PBX based on HTPB/AI binder system reachs 90% using conventional practice. The influence of binder system on mechanical sensitivity, compatibility, performance and other properties were investigated. The results show that AI decreases the tensile modulus of HTPB film, thus decreasing its mechanical sensitivity. The viscosity at the end of mix of PBX slurry is decreased and the performance is improved due to the high solid content. Vacuum high temperature rotary evaporation of raw materials removes impurities and keeps plasticizer from leakage with the ideal compatibility.