纳米ATO粉体的高度均匀与稳定分散研究

Research on the dispersion uniformity and stability of nano-ATO

纳米氧化锡锑(ATO)粉体的高效分散和长期稳定是制备纳米透明隔热材料的关键因素。首先考查了分散剂、pH值、粉体表面特性、分散工艺、粘度等参数对分散稳定性的影响,采用沉降法、分光光度计法、电镜法对分散效果进行表征。结果表明,采用复合分散剂,其添加量占粉体质量5%,同时采用超声和球磨相结合的分散方式可以使分散效果达到最佳;通过增加粉体表面球度和分散介质粘度的方法可以有效提高粉体的分散稳定性,pH值对粉体分散稳定性影响不大。最后,通过优化分散工艺得到了高度均匀、长期稳定的纳米ATO分散液及纳米透明隔热涂料。

The efficient dispersion and long-term stability of nano-ATO are the key factors to prepare nano transparent insulation material.Influences of the value of pH,type and content of dispersants,surface characteristics of particles,dispersing technology,and viscosity on the dispersion stability are discussed.The dispersion effect is characterized by methods of sedimentation,spectrophotometry and scanning electron microscope.The results show that the dispersion effect can reach the optimal state by using compound dispersant with its dosage being 5%of particles mass,and adopting dispersion ways of combining ultrasound and ball milling.The stability of particles can be effectively improved by increasing the sphericity of particles and the viscosity of dispersion medium.The value of pH has a little impact on dispersion stability.The nano-ATO dispersion paste and nano transparent insulation coating with high uniformity and long-term stability is obtained by optimizing dispersion process.