A Study On The Preparation And Performances Of The Superfine Powder Fire Extinguishing Agent

It was mainly studied in this dissertation that the reduction in the size of dry powder and the surface modification of superfine dry powder, which are the two key technology in the development of the superfine powder fire extinguishing agent.The suitable smashing method and its relevant pulverizer were proposed through cross-demonstration. The particle size of raw material was reduced to less than 5 u m. From this, a conclusion was obtained that the rotating rate of pulverizer, operation time, ball match and the load have important influence on the particle size and its distribution. In addition , aiming at the component and particle size of the superfine powder , the mechanical-chemical method and dispersing emulsifier were selected to modify the surface of superfine dry powder. The two methods are both effective to improve the powder's anti-gathering ability and fluidity. The results show that the modification effect of the dispersing emulsifier is better than mechanical-chemical method. But its process is more complicated than mechanical-chemical method. After that, the variety and concentration of surfactant, two key factors of modification, have important influence on the effect of modification.