水性纳米二氧化钛浆料的研制

Preparation of waterborne nanometer titanium dioxide slurry

研制了一种纳米TiO2水性浆料。研究了钛酸酯偶联剂、分散剂、pH、有机膨润土以及分散方法对浆料稳定性的影响。获得了最佳配方:0.12%钛酸酯偶联剂B,0.5%分散剂3275,pH=11,0.5%有机膨润土,分散方法为高速剪切30min+砂磨10h+超声波分散30min。获得了稳定性可达到3个月以上的水性纳米TiO2浆料。紫外加速老化试验表明,当纳米TiO2浆料占清漆的3%时,经过1000h的加速老化实验后,清漆不变色。

A waterborne nano-TiO2 slurry was prepared. The influences of titanate coupling agent, dispersing agent, pH, organobentonite and dispersing method on the stability of slurry were studied. The optimal formula was obtained as follows： titanium coupling agent B 0.12%, dispersant 3275 0.5%, pH 11, organobentonite 0.5%, dispersing by high-speed shearing 30 min ＋ sand grinding 10 h ＋ ultrasonic dispersing 30 min. The stability of the waterborne nano-TiO2 slurry was up to more than three months. UV accelerated aging tests showed that the varnish does not change its color after 1 000 h of accelerated aging experiment when nano- TiO2 slurry accounts for 3% of the varnish.