pearlescent pigments are widely used in additives of cosmetics, construction materials, paints, inks and coatings due to its exceptional chemical stability, moderately high tinting strength and excellent hiding power. The pearlescent pigments have the various advantages, but recent pearlescent pigments demanded numerous functions more than the previous advantages by increase for user''s needs. In these variety feature, magnetic property is significant feature at division of industrial and cosmetic pigment at recent most. Among metal oxide materials, Fe3O4 (magnetite) draw much attention for the possible application on soft magnetic ferrite storage device due to its harmless, excellent electrical and magnetic properties. Generally Fe3O4 was fabricated at high-temperature and high-pressure, that was not a suitable method for pigment manufacturing process.
In this study Fe3O4 particle was precipitated on pearlescent pigments at atmospheric pressure and temperature below 100 ℃ by hydrothermal method, which is suitable for pigment manufacturing process.
The overall objective of this research was found the optimum condition in order to obtain high purity of Fe3O4 particle on Ti coated nature mica by adjusting Fe2+ ion and Fe3+ ion mole ratio in precursor solution based on hydrothermal method. Fe3O4 was prepared on the TiO2 coated natural mica substrate for suitable pigment industry. The natural mica has an paticle size of about 22 ㎛. The TiO2 particle were coated on nature mica using a hydrothermal synthesis method under pH 1.5 ~ 2.5 at 75℃. Fe precursor solution was prepared by mixing a FeSO4 for Fe2+ ion and FeCl3 for Fe3+ ions with different molar ratio such as 1/2, 1/1, 2/1, and 3/0(Fe3O4 only). Follow after FeSO4 obtained from ideal condition of molar ratio between FeSO4 and FeCl3 was coated on TiO2 coated natural mica by a hydrothermal synthesis method under pH 9.0 at 80℃.
The result of X-ray Diffractometer(XRD) indicated that is on FeCl3 and FeSO4 molar ratio. As the result, Fe3O4 crystal phase was increased by growth of FeSO4 ratio. only using FeSO4, that was suitable composition of precursor in this condition. ScanningElectronMicroscope(SEM)-EnergyDispersiveX-ray(EDX) and Mossbauer results show the on the molar ratio, Fe3SO4 shows crystal structure.