CL‐20 Based Ultraviolet Curing Explosive Composite with High Performance

Abstract

Abstract The integration of the Ultraviolet (UV) curable resin into energetic materials, has been a new direction in the field of explosive inks with high curing speed and high solid loading. In this ink formulation, polyurethane acrylate (PUA), 2,4,6‐trimethylbenzoyl‐diphenylphosphine oxide (TPO) and hexanitrohexaazaisowurtzitane (CL‐20) were selected as binder, photoinitiator and main explosive, respectively. The CL‐20 based UV‐curing explosive composite was prepared by UV‐curing and direct ink writing (DIW) technology. The rate of curing, micro‐scale structure, morphology, crystal type, impact sensitivity, and detonation ability of the sample were characterized and analyzed. The results show that the curing process of CL‐20 based UV‐curing explosive ink could be completed within 7 minutes after UV‐curing for 3 minutes, revealing rapid curing speed. In the preparation process of CL‐20 based explosive composite, the crystal type of CL‐20 do not change. Compared with raw CL‐20, the explosive composite has a lower impact sensitivity. Moreover, the critical detonation size is around 1×0.078 mm, and the detonation velocity is 7357 m s −1 .