球磨时间对BC干粉灭火剂形态特征的影响

Influence of Milling Time on Morphologic Characters of BC Dry Powder Extinguish Agents

为了探究球磨时间对BC干粉灭火剂形态特征的影响机理,以常用的BC干粉灭火剂为原料,硬脂酸镁为表面改性剂,采用机械粉磨法对其进行粉磨,并测定其形态特征.结果表明,当球磨时间为0.5～4 h时,粉体表观中位粒径呈现先减小后增大的趋势,粉体形貌由较为松散的团聚体变为较密实的球形团聚体,转折点为球磨时间2h,球磨工艺的最优表观中位粒径为3.82 μm,最佳球磨时间为2h,极限粒径约为0.9～1.2 μm.

To investigate the influence mechanism of milling time on morphologic characters of BC dry powder extinguish agents, the BC dry powder extinguish agents were prepared by utilizing planetary ball milling apparent to grind the mixture powders which were consisted of BC dry powder extinguish agents and magnesium stearates. The morphologic characters of the milling and commercial powders were measured. The results show that the apparent median particle size decreases firstly and then increases when the milling time is between 0.5 and 4 h. The morphology turns from a loose aggregate to a dense spherical aggregate. The critical milling time is 2 h. The optimal apparent median particle size is 3.82μm. The optimum milling time is 2 h. The limit particle size is between 0.9 and 1.2 μm.