Method for preparing pigment changeable colors along with angle in iron, titanium series

Abstract

A process for preparing the FeTi-series pigments whose color is changeable with the visual angle includes such steps as providing mica titanium with different interference colors, pretreating, regulating pH value, depositing an iron hydroxide layer on its surface, and calcining to convert iron hydroxide to alpha-Fe2O3.

Description

technical field

[0001] The invention relates to a method for preparing iron-titanium series variable-color pigments. Background technique

[0002] The angle-dependent pigment refers to the color of the pigment changes with the different viewing angles under the irradiation of light, or the color of the pigment changes accordingly when the viewing angle remains unchanged and the illumination angle of the light source is changed. This kind of pigment is widely used in industries such as cosmetics, inks, paints, building materials, and ceramics, as well as anti-counterfeiting marks such as currency, certificates, trademarks, and securities.

[0003] According to the search, the methods for preparing the angle-variable pigments mainly include: (1) US Patents US4705300, US4705356, US5084351, etc. adopt the physical vapor deposition method, that is, the Fabry-Perot stacking method (FP method for short). The angle-dependent pigment produced by this method has a double sandwich str...