以Si69为改性剂,无水乙醇为溶剂,设计正交试验,对沉淀法白炭黑粉体进行有机湿法改性,探究实验最佳工艺.采用X射线衍射、傅里叶红外光谱、热失重分析仪、接触角仪、纳米粒度及Zeta电位仪、扫描电镜等对改性前后白炭黑的结构形貌及其性能进行表征,主要考察了Si69改性剂对沉淀法白炭黑的疏水性及分散性的影响.结果表明:实验的最佳工艺为反应温度55℃,反应时间4h,pH值为7.当Si69用量为0.375 g时,改性白炭黑的分散性最好.改性后的白炭黑仍为无定形态,物相结构没有变化;改性过后的白炭黑其表面羟基数减小,疏水性增强,接触角由改性前的9°增大到97°;改性使白炭黑表面极性减弱,粒径分布变窄,降低了颗粒团聚程度,分散性得到明显提高.
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