Thermally stable color pigments with nanofiber coating
AssigneeHong Kong Baptist University
InventorsCham Fai LEUNG, Chung Yan YICK
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Abstract
A method to coat oxide-based color pigments with an ultrasound-assisted coating of nanofiber or other nanostructures in order to enhance heat-fastness and color performance to said color pigments is presented. In particular, the present invention provides a method to coat oxide-based color pigments with nano-coating materials, including but not limited to, alumina and/or silica at different dosage levels, with nanospike, nanoneedle, nanoplate, and/or nanoflower morphology towards enhancing the heat-fastness and color performance of said color pigments.
Claims20
A method of increasing the thermal stability of iron oxide pigments comprising:
- placing iron oxide pigment in a coating material precursor solution, wherein the coating material precursor solution is a precursor of one or more of aluminum oxide and silicon oxide;
- treating the iron oxide pigment and the coating material precursor solution with ultrasound at a temperature of less than 100° C. to promote nanoparticle formation on the iron oxide pigment;
- and
- growing a coating from the coating material precursor solution to grow nanoparticles of one or more of the aluminum oxide and the silicon oxide on a surface of the iron oxide pigment such that the resulting iron oxide pigment is thermally stable to a temperature of at least 230° C.
Yellow iron oxide pigment coated with one or more of aluminium oxide and silicon oxide nanoparticles selected from nanofibers, nanoneedles, nanospikes, nanoplates, or nanoflowers or mixtures thereof that is thermally stable to at least approximately 230° C.
Dependencies are inferred from the claim text.