超细磷酸二氢铵灭火剂的振动球磨法制备与表面改性

Preparation of Superfine Ammonium Phosphate Dry Chemical Fire Extinguishing Agent by Using Vibratory Milling Method and Surface Modification

采用振动球磨方式并添加少量粉碎助剂对磷酸二氢铵干粉进行超细化,制得了超细磷酸二氢铵粉体.再利用甲基含氢硅油在高速粉体混合机内对其表面改性,制得了粒子表面形态规整,中位径4.12μm,比表面积880.43 m2/kg的超细磷酸二氢铵灭火剂.所制得的干粉灭火剂疏水性好,抗结块性强,吸湿率为1.7%,抗结块性(以针入度表示)为30.5 mm.实验表明:经超细化和改性制得的磷酸二氢铵干粉灭火剂喷射率为98.7%,喷射时间为10 s,灭火时间为3 s,平均灭火用量为60 g/m3.

By using the vibratory milling method and adding abrasive,superfine powder of ammonium phosphate was produced from the ammonium phosphate dry powder.The superfine ammonium phosphate dry chemical fire extinguishing agent,of which the average diameter was 4.12 μm and the average specific surface area was 880.43 m2/kg,was produced through the special surface modification by using the hydric cymene silicon oil in the mixing equipment.The fire extinguishing agent featured better hydrophobicity.It was anti-caking,and its moisture adsorption rate was 1.7%.The anti-agglomeration was 30.5 mm（by penetration degree）.The experiments showed that the ejection rate was 98.7%,the ejection time was 10 s,the fire extinguishing time was 3 s,and the average fire extinguishing quantity was 60 g/m3.