On Safe Combustibility of Mixtures of Propellants and Polymers for Mines and Quarries

Mixtures of single-base propellant with chlorine and bromine-containing polymers in different ratios, applied in mines and quarries abroad, were investigated. The exoeffects: maximum temperature of the peak, quantity of released heat and loss of mass were determined by a differential scanning calorimetry, after a standard aging of 120 and 240 hours under conditions imitating the sunshine. Combustibility of mixtures was analyzed according to a standardized factor of combustibility (К), Mixtures were subdivided into four groups depending on their values: easily combustible, combustible, self-extinguishing and non-combustible. Effective action of selected compounds depended on speed of formation of combustion retardants, which depended on temperature of thermal destruction. That was the reason for mixing propellants with polymers, whose initial temperature of destruction had been lower than the temperature individual combustion of propellant. Thus effective combustion retardant was created in the initial stage of mixture heating. Controllable fuel characteristics of recipes improve the safety of transport, storage and use of offered materials.