摘要：采用水介质中机械力研磨复合方法制备以滑石为包核、表面包覆TiO₂的滑石-TiO₂复合白色颜料, 对复合颜料的性能和结构进行表征, 对其在涂料中的应用进行研究。结果表明:复合颜料的颗粒以滑石表面紧密、牢固包覆TiO₂颗粒为特征, 粒径分布均匀;复合颜料性能与钛白粉相当, 复合60%和70%TiO₂颜料的遮盖力分别达钛白粉的82%和98.9%;添加滑石-TiO₂复合白色颜料15%~20%的涂料涂膜对比率分别≥0.90和≥0.93, 达到国标一等品或优等品指标要求, 且具有良好的抗紫外老化性能。

关键词：滑石；二氧化钛；白色颜料；涂料

Abstract：A kind of composite white pigment was prepared using the talc as cores and coating on the surface by TiO₂ by means of mechano-chemical method. The properties and structure of talc-TiO₂ composite white pigment were characterized, and its application in coating was studied. The results show that TiO₂ particles tightly coates talc particles' surface. The size of composite particles distributes evenly. The composite particles has a similar pigment properties like titanium dioxide. The hiding power rates two composite powders, contenting TiO₂ of 60% and70%, respectively reach 82% and 98.9% of titanium dioxide.When the amount of pigment is added to 15%~20%, the contrast ratio of these two kinds of composite pigment exceeds the value formulated by the national standard grade index required (≥0.90) and quality indexes (≥0.93) , and composite powders of titanium dioxide have a considerable ultraviolet absorption capacity.

Keywords: talc；titanium dioxide；white pigment；coating