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›› 2009, Vol. 9 ›› Issue (6): 1222-1226.

• 材料工程专栏 • 上一篇    下一篇

甲基含氢硅油对喷雾干燥磷铵灭火粉性能的影响

张晓静 沈志刚 傅宪辉 蔡楚江 郑艳红   

  1. 北京航空航天大学北京市粉体技术重点实验室 北京航空航天大学北京市粉体技术重点实验室 北京航空航天大学北京市粉体技术重点实验室 北京航空航天大学北京市粉体技术重点实验室 北京航空航天大学北京市粉体技术重点实验室
  • 收稿日期:2009-06-17 修回日期:2009-09-07 出版日期:2009-12-20 发布日期:2009-12-20
  • 通讯作者: 张晓静

Influence of Methylhydrosiloxane on Ammonium Dihydrogen Phosphate Fire-extinguishing Powder in Spray-drying Process

ZHANG Xiao-jing SHEN Zhi-gang FU Xian-hui CAI Chu-jiang ZHENG Yan-hong   

  1. Beijing Key Laboratory for Powder Technology Research and Development, Beijing University of Aeronautics and Astronautics Beijing Key Laboratory for Powder Technology Research and Development, Beijing University of Aeronautics and Astronautics Beijing Key Laboratory for Powder Technology Research and Development, Beijing University of Aeronautics and Astronautics Beijing Key Laboratory for Powder Technology Research and Development, Beijing University of Aeronautics and Astronautics Beijing Key Laboratory for Powder Technology Research and Development, Beijing University of Aeronautics and Astronautics
  • Received:2009-06-17 Revised:2009-09-07 Online:2009-12-20 Published:2009-12-20
  • Contact: ZHANG Xiao-jing

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摘要： 采用喷雾干燥法制备了球形空心超细NH4H2PO4灭火粉，并添加甲基含氢硅油乳液、氟碳表面活性剂FK-510对粉体进行原位改性，研究了表面活性剂甲基含氢硅油对NH4H2PO4灭火粉的疏水性、表面元素、表面形貌、分散性及粒度分布的影响. 结果表明，干燥过程中甲基含氢硅油及FK-510迁移聚集于颗粒表面，且FK-510位于最外层而甲基含氢硅油位于次外层，明显提高灭火粉疏水性；添加甲基含氢硅油明显改善了粉体分散性，当硅油添加量为NH4H2PO4质量的3%时，所得产品疏水性、分散性和球形度良好，活化指数提高到93.7%.

关键词: 甲基含氢硅油, 磷酸二氢铵, 灭火粉, 喷雾干燥, 疏水性

Abstract: Superfine spherical fire-extinguishing powder, ammonium dihydrogen phosphate, was prepared using spray-drying, and modified in situ with silicon oil emulsion and fluorocarbon surfactant FK-510. The influences of methylhydrosiloxane dosage on activation index, surface element, surface morphology, dispersion and particle size distribution of ammonium dihydrogen phosphate were studied. The results indicate that methylhydrosiloxane and FK-510 congregates on the particle surface, with FK-510 outermost and methylhydrosiloxane second outer, which improves particle hydrophobicity and bring fine dispersion. When methylhydrosiloxane dosage is 3%(w) of ammonium dihydrogen phosphate, powder activation index reaches 93.7%, and powder gets nicer hydrophobicity, dispersion and sphericity, so it is the optimal dosage of surfactant.

Key words: methylhydrosiloxane, ammonium dihydrogen phosphate, fire-extinguishing powder, spray-drying, hydrophobicity

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