Study on the inhibition of explosion and combustion of coal dust based on the structure of core-shell microencapsulated polyurethane

In order to study the effect of core-shell microencapsulated ammonium polyphosphate modified materials on the suppression of explosion and combustion of different metamorphic coal, a core-shell microencapsulated ammonium polyphosphate explosion inhibitor was prepared using in-situ polymerization method. Through experiments on flame suppression and overpressure suppression during explosive combustion, the inhibitory effect of core-shell microencapsulated ammonium polyphosphate explosion suppressant on coal dust explosion was studied, revealing the coupling inhibition mechanism of thermal propagation isolation obstruction effect and group reaction reduction of key atoms. The experimental results show that when 60 wt% core-shell microencapsulated ammonium polyphosphate explosion suppressant is added, the suppression effect on the explosion and combustion of different metamorphic coal is significant, and the flame propagation and pressure rise of coal dust explosion can be basically achieved. By analyzing the substances before and after the explosion through characterization experiments, the inhibitory mechanism of core-shell microencapsulated ammonium polyphosphate explosion suppressant on different metamorphic coal was obtained. Expanding the application field of microcapsule materials provides important methods and theoretical basis for developing core shell microcapsule flame retardant and explosion suppression materials to prevent coal dust explosion disasters.