Cobalt Chromite Spinel Pigments: AnNIR Reflective Green Pigment for Automotive Coatings

The new application of CoCr2O4 as a high near-infrared (NIR) reflective inorganic pigment has been developed. CoCr2O4spinel pigments with different average sizes have been synthesized throughsolid-state route with thecalcination temperature increasing from 900to 1300 ºC. Results show that calcination temperature has strong effect on the crystallinity, morphology and optical properties of the pigments. The pigment prepared at 1300 ºC known as the optimum sample due to phase purity, homogenous morphology and higher reflectance properties. The prepared CoCr2O4 pigments can be well served as colored cool colorant especially for automotive coatings.

Keywords:

NIR reflective pigments , solid state reaction , automotive cool coatings , spectrophotometry