选用了多种改性剂,用超声波为分散手段,将纳米ATO粉体在有机单体介质中进行表面改性和分散,研究了改性剂种类、改性剂用量、改性时间、超声波输出功率和超声波处理时间等对纳米ATO-单体分散液稳定性的影响,探讨了纳米ATO表面改性机理.结果表明,硅烷偶联剂KH-570是纳米ATO的最佳改性剂,当其用量为纳米ATO的15%(质量分数),改性时间为24h,超声波输出功率为90%,超声波处理时间为12min时,纳米ATO-单体分散液具有最佳的分散稳定性.KH-570主要通过在纳米ATO表面水解产生硅羟基的自缩合,形成包覆改性.
Nanometer-sized antimony doped tin oxide (ATO) particles have been surface-modified and dispersed in organic monomer medium with different kinds of modifiers by using ultrasonic. The effects of modifier type, the amount of modifier,modification time,ultrasonic power output,and ultrasonic time on the dispersion stability of nanometer-sized ATO-monomer dispersion were studied and the surface modification mechanism was discussed. The results show that the nanometer-sized ATOmonomer dispersion with the optimal dispersion stability can be obtained by using silane coupling agent KH-570 as modifier, with the ratio of KH-570 to nanometer sized ATO of 15wt%,modification time of 24h,ultrasonic power output of 90% and ultrasonic time of 12min.The main modification mechanism is that the silanol groups of KH-570 formed by hydrolyzing can be coated on the surface of nanometer-sized ATO particles by self-condensation.
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