| 초록 |
This presentation studies the experimental method that uses the homogeneous precipitation method to prepare mica flakes coated anatase-type titania pearlescent pigment with urea as precipitant. The optimum technology parameters, the chemical composition, the microstructure, and the color property of resulting pigments are discussed. The coating principle of mica coated titania with various coating thickness is analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy(TEM) and tested by spectrophotometer analysis. The colored nanocrystalline pigments with different morphology and coating thickness 45–170 nm were prepared by homogeneous precipitation treatment of TiOSO4(titanum oxysulfate) aqueous solutions. Mica of particle size in the ranges 10–100 μm was suspended in water, metal sulphates, and urea were added to the mixture which was heated to boiling. The influences of homogeneous precipitation treatment conditions on the formation features, composition, coating thickness, morphology, and optical properties of the products were investigated and discussed. Characterizations on the pigments show that the properties of the pigment depend mainly on mica size, thickness of the metal oxide deposit and its chemical composition and crystal structure. “This work was supported by the Grant of the Korean Ministry of Education, Science and Technology (The Regional Core Research Program / Medical & Bio-Material Research Center)" |
