偏钛酸性质结构对颜料钛白的影响

Effects of Properties and Structure of Metatitanic Acid on Rutile White Pigment via Short Sulfate Process

硫酸法钛白短流程工艺中,水解偏钛酸的性质结构(晶体结构、粒度分布、杂质含量等)对金红石型钛白的结构与颜料性能有重要影响,并存在内在影响规律。为制备结构良好、颜料性能优异的金红石TiO_2,优化条件为:控制偏钛酸的晶粒尺寸小于8.9 nm并接近7.9 nm,能有效促进金红石的晶型转变和晶粒生长,获得良好晶体结构和晶型完整的金红石;偏钛酸适宜的粒度大小及分布对获得窄粒径分布的金红石钛白影响明显,钛白的粒径大小影响其散射力,宜控制在0.20μm附近;可控制水解条件以减小偏钛酸的比表面积,进而减少杂质铁吸附。

The properties and structure of metatitanic acid, such as crystal structure, particle size distribution and impurity iron's content, have great effects on the structure and pigment properties of rutile titanium dioxide, and there exists inherent relationship between them. The rutile Ti02 white pigment was produced via short sulfate process by using unenriched low concentration industrial titanyl sulfate solution as titanium source. In order to produce rutile Ti02 with good structure and excellent pigment properties, the optimal conditions are as following. Controlling the grain size of metatitanic acid less than 8.9 nm and about 7.9 nm can effectively promote the crystal transformation and grain growth of the rutile pigment, and obtain rutile pigment with good and integrated crystal structure. The appropriate particle size distribution of metatitanic acid has an obvious effect on rutile titanium dioxide with narrow particle size distribution, and rutile pigment of near 0.20μm in the particle size can obtain higher relative scat!ering force. The hydrolysis conditions should be controlled to reduce the specific surface area of metatitanic acid, aiming at reduction of the iron impurity adsorption.