Cobalt blue hybrid pigment doped with magnesium derived from sepiolite

• Published in: Applied clay science Vol. 157; pp. 111 - 120
• Main Authors: Zhang, Anjie, Mu, Bin, Li, Huaming, An, Xingcai, Wang, Aiqin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2018
• Subjects: Bright blue; Cobalt blue; Heat-resistant; Organosilica coating; Sepiolite; Bright blue; Heat-resistant; Organosilica coating; Cobalt blue; Sepiolite
• ISSN: 0169-1317; 1872-9053
• DOI: 10.1016/j.clay.2018.02.032

Owing to the scarcity in nature of cobalt ores and the disadvantages of cobalt blue prepared via traditional solid-phase method, the high cost of cobalt blue pigment severely restricted their wide application in the relevant fields. Here, sepiolite was employed to fabricate the bright blue cobalt blue hybrid pigment via combining chemical co-precipitation and calcination process. The introduction of sepiolite not only dramatically decreased the cost of cobalt blue pigment, but also enhanced its color property presumably due to the doping of magnesium derived from sepiolite. The hybrid pigment calcined at 1100 °C for 2 h exhibited good color properties (L⁎ = 55.8, a⁎ = −2.3, b⁎ = −55.0), excellent thermal stability and suspension stability. The as-prepared hybrid pigments as a coloring pigment could effectively improve the heat-resistant performance after being incorporated into organosilica coating. In addition, the hybrid pigments could be well sprayed onto various substrates via a facile procedure. Thus it is expected to apply this low-cost bright blue cobalt blue hybrid pigments into various fields. [Display omitted] •Sepiolite was employed to fabricate the bright blue cobalt blue hybrid pigment.•Introducing of sepiolite decreased the calcining temperature to form spinel-type CoAl2O4.•Mg2+ derived from sepiolite entered into the tetrahedrally coordinated sites of CoAl2O4.•Hybrid pigments exhibited good color properties, excellent thermal stability and suspension stability.•Hybrid pigments could improve the heat-resistant performance of organosilicane coating.