摘要：采用沉降法研究了不同分散剂对超细二氧化钛粉末在水溶液中分散性的影响。结果表明:SDS、TPB、聚丙烯酸钠、乙二醇是超细二氧化钛粉末的有效分散剂。通过测定颗粒表面Zeta电位、悬浮体系粘度,分析了分散剂的作用机理。实验结果表明:SDS、TPB、聚丙烯酸钠能显著提高水溶液中二氧化钛表面Zeta电位绝对值,增大了颗粒间静电排斥力,改善了悬浮液稳定性,降低了体系的粘度。而乙二醇能在颗粒表面形成良好的溶剂化层,提高了二氧化钛在水溶液中的分散稳定性。

关键词：超细二氧化钛;分散;Zeta电位;稳定性;粘度;

Abstract: The sedimentation method is used to determine the effects ofdispersant on the dispersion of ultrafine TiO₂ particles in aqueous solution. The results show that SDS、TPB、sodium polyacrylate are effectivedispersants for TiO₂ particles in aqueous solution. The dispersion mechanism is analysed by testing Zeta potential and the viscosity of the suspensions. SDS、TPB、sodium polyacrylate can significantly increase the abso-lute value of Zeta potential, and ethylene glycol can form a good solventlayer on the particle surfaces. This lead to the enhancement of the stability of the TiO₂ suspensions.

Keywords: ultrafine TiO₂; dispersion; zeta potential; stability; viscosity