Abstract
Emulsion explosives are one type of main industrial explosives. The emergence of the large cartridge emulsion explosives has brought new security incidents. The differential scanning calorimeter (DSC) and the accelerating rate calorimeter (ARC) were selected for the preliminary investigation of the thermal stability of emulsion explosives. The results showed that the initial thermal decomposition temperatures were in the range of 232–239 °C in nitrogen atmosphere (220–232 °C in oxygen atmosphere) in DSC measurements and 216 °C in ARC measurements. The slow cook-off experiments were carried out to investigate the critical temperature of the thermal decomposition (Tc) of the large cartridge emulsion explosives. The results indicated that the larger the diameter of the emulsion explosives, the smaller the Tc is. For the large cartridge emulsion explosives with diameter of 70 mm, the Tc was 170 °C at the heating rate of 3 °C h−1. It is a dangerous temperature for the production of the large cartridge emulsion explosives and it should cause our attention.
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