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

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 than 95.9 and hiding power over 78.9%.