粒径对钛白粉光学性能的影响

Influence of Particle Size on the Optical Properties of Titanium Dioxide Pigment

研究了210~260 nm范围内粒径对金红石型钛白粉颜料性能及漆膜遮盖力的影响,使用扫描电镜对粒子粒径及形貌进行了表征。试验结果表明:钛白粉粒径由216 nm增大到259 nm,消色力逐渐增大,蓝相值逐渐减小。亮度随粒径增大而增大,从95.36增大到96.18,增加约0.8,粒径达到250 nm后,亮度基本不变。钛白粉制成的油墨样品遮盖力随粒径增大而逐渐变大,增长速率由快变慢。250~260 nm为最佳粒度范围,消色力达到2100雷诺数以上,蓝相值在3.5~3.8,亮度大于95.9,遮盖力大于78.9%。

The influence of particle size ranging from 210 to 260 nm on the pigment properties and hiding power of rutile titanium dioxide was studied.Scanning electronic microscopy(SEM) was utilized to characterize the particle size and morphology of titanium dioxide. The experimental results show that the tinting strength(TCS) increases whereas the spectral characteristics(SCX) decreases gradually when the particle size of titanium dioxide increases from 216 to 259 nm. The increasing particle size causes the increase of brightness(Jasn) from 95.36 to 96.18. When the particle size is greater than 250 nm,Jasn almost keeps constant.The hiding power of ink film pigmented with titanium dioxide also increases with increasing the particle size,and the rising rate becomes slow gradually.The best optical properties can be obtained when the particle size is 250 ~ 260 nm with TCS over 2100 Ranolds,SCX between 3.5 and 3.8,Jasn more than95.9 and hiding power over 78.9%.