CAJ | 학술논문

采用喷雾干燥法制备了球形空心超细NH_4H_2PO_4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NH_4H_2PO_4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NH_4H_2PO_4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%.
채용분무간조법제비료구형공심초세NH_4H_2PO_4멸화분,병첨가갑기함경규유유액、불탄표면활성제FK-510대분체진행원위개성,연구료표면활성제갑기함경규유대NH_4H_2PO_4멸화분적소수성、표면원소、표면형모、분산성급립도분포적영향.결과표명,간조과정중갑기함경규유급FK-510천이취집우과립표면,차FK-510위우최외층이갑기함경규유위우차외층,명현제고멸화분소수성;첨가갑기함경규유명현개선료분체분산성,당규유첨가량위NH_4H_2PO_4질량적3%시,소득산품소수성、분산성화구형도량호,활화지수제고도93.7%.
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%(ω) 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.