Superfine Spherical Hollow Ammonium Dihydrogen Phosphate Fire-Extinguishing Particles Prepared by Spray Drying

摘要

Superfine spherical hollow ammonium dihydrogen phosphate fire-extinguishing particles are prepared by spray drying and modified in situ with silicon oil emulsion. The results show that the amount of rough particles increased observably when the proportion of silicon oil emulsion is increased from 9 to 15wt%, while no significant difference is detected when the proportion of silicon oil emulsion was varied from 0 to 9wt%. The flowability of particles is improved with an increase in the proportion of silicon oil emulsion;; 9.0 wt% is the optimal proportion of silicon oil emulsion for improving the hydrophobic performance of particles. Fire-extinguishing tests show that the fire-extinguishing capability of spray-dried superfine spherical hollow ammonium dihydrogen phosphate fire-extinguishing particles is much better than the two varieties of existing superfine dry chemical fire-extinguishing agents.