In order to develop a kind of packaged emulsion explosive with full appearance and long storage period, the formulation of the packaged emulsion explosive with the best natural storage performance was selected as the reference object. The corresponding emulsion matrix was prepared by testing different kinds and proportions of emulsifiers, and the corresponding packaged emulsion explosive was prepared by physical sensitization and chemical sensitization. The storage stability of each emulsion explosive was evaluated by means of high-low temperature cycle tests and water solubility tests. The results show that the stability of the emulsion explosive prepared by polymer emulsifier LZ2832 is better than that prepared by polymer emulsifier EPE-3002. Among the composite emulsifiers, the stability is best when the ratio of emulsifier Span80 to emulsifier LZ2832 is 1∶9, which can be subjected to at least 40 high-low temperature cyclic tests. It is expected that this packaged emulsion explosive product can be stored naturally for more than 24 months. In explosive sensitization, hollow glass microspheres with a matrix mass of 1.2% are first physically sensitized. In addition, accelerant #2 with 0.2% matrix mass and a sensitizer with 0.3% matrix mass are used for chemical sensitization when the temperature dropped to 50~55 ℃. The aftereffect of explosive sensitization is obvious, and the final density is controlled at 1.05 to 1.10 g/cm³. The results of batch production tests on the production line are consistent with the experimental results, and the full and elastic packaged emulsion explosive product with a long storage period has been successfully developed. The explosive has remained stable in natural storage for 12 months with the detonation velocity more than 4500 m/s, the brisance more than 16 mm, and the detonation distance more than 6 cm.

packaged emulsion explosive  /  storage period  /  compound emulsifier  /  compound sensitization