Pearlescent pigment gives substrate special optical effect such as metallic feelings and gloss. In external decoration, plastics, and cosmetics field, there are a growing number of demands on pearlescent effect for developing the value of product. In this study, colored pearlescent pigment that simultaneously express external and interferecent color was prepared by coating ferric ferrocyanide, cobalt oxide, and brilliant blue pigment on titanated mica that has blue interference color, overcoming disadvantage like expression of various color.
Ferric ferrocyanide was coated on titanated mica adding potassium ferrocynide 3.6 wt% and iron(Ⅲ) chloride 3.1 wt% at pH 4.5, leading to well dispersed coating. The cobalt oxide coating showed blue and green color depending on the composition and type of cobalt chloride and metal salt precursor. The case that precursor composition ratio is 1 : 2 ratio of cobalt chloride to aluminum chloride, 1 : 2 ratio of cobalt chloride to magnesium chloride, 1 : 2 ratio of cobalt chloride to calcium chloride, 1 : 1 ratio of cobalt chloride and zinc chloride showed the most vivid color. When 3.6 g of aluminum chloride was used as the coagulant in the coating of brilliant blue, the chroma value was 34.52, and the uniformity of the particles was the highest. When hydrochloric acid and aluminum chloride were used as coagulants, surface coagulation occurred a lot, but the highest chroma value was 38.18, which was the brightest color.
The coating stability of the synthesized blue pearl luster pigment and the degree of elution in aqueous solution were confirmed to be stable coatings in the order of ferric ferrocyanide, brilliant blue and cobalt oxide. The eye shadow containing the synthesized blue pearlescent pigment was stable even after 1 month exposure to ultraviolet light. Various color change characteristics of pigments were confirmed by colorimetry. The physicochemical properties of the synthesized pigments were investigated by SEM, XRD, FT-IR, EDS.