超细Al（OH）3粉体的表面改性与表征

目的 对超细Al(OH)3粉体的表面进行改性,增强其相容性、水溶性.方法 选用硬脂酸、有机硅、六偏磷酸钠、乙二醇对超细Al(OH)3粉体进行湿法改性,通过活化指数、润湿角、红外光谱和沉降分析,对改性Al(OH)3粉体的表面润湿性、改性前后粉体的表面键型的变化,以及改性粉体在水溶液中的分散稳定性进行测试,表征和评价了粉体表面改性的效果.结果 硬脂酸、有机硅、六偏磷酸钠、乙二醇对超细Al(OH)3粉体的改性后的活化指数均大于0.90;硬脂酸和有机硅增强了Al(OH)3粉体的亲油性,六偏磷酸钠和乙二醇增强了Al(OH)3粉体的亲水性.结论 硬脂酸、有机硅、六偏磷酸钠、乙二醇对超细Al(OH)3粉体都能起到显著的表面改性.

Surface Modification and Evaluation of Ultrafine Al(OH)3 Powder

The surface modification of ultrafine Al(OH)3 powder is studied in this paper.The ultrafine Al(OH)3 powder was wetly modified with stearic acid,organosilicon,sodium hexametaphosphate and glycol.By the analysis of activation index,wetting contact angle,infrared spectrum and sedimentation,we tested the surface wettability of modified powder,the surface bond type changes of the powder and the dispersing stability of modified ultrafine Al(OH)3 powder in aquatic solution.We also characterized and evaluated the powder surface modification effect.The test results show that the activation index are more than 0.90 when stearic acid,organosilicon,sodium hexametaphosphate and glycol have modified the ultrafine Al(OH)3 powder.Lipophilicity is reinforced by stearic acid and organosilicon,and hydrophilicity by sodium hexametaphosphate and glycol.Stearic acid,organosilicon,sodium hexametaphosphate and glycol have obvious surface modification on ultrafine Al(OH)3 powder.