A facile approach to fabricate bright blue heat-resisting paint with self- cleaning ability based on CoAl_2O_4/kaolin hybrid pigment

摘要

A bright blue and low-cost heat resisting paint with excellent self-cleaning ability was prepared by adding superhydrophobic CoAl2O4/Kcaolin hybrid pigment (K -HP). Kaolin (K) was served as a suitable matrix for anchoring CoAl2O4 nanoparticles to prepare K -HP, and then it was modified with hexadecyltrimethoxysilane to construct the superhydrophobic hybrid pigment based on the rough structure of K -HP. The sprayed coating of the superhydrophobic heat -resisting paints exhibited the good self-cleaning performance with high water contact angle of 164.3 degrees and low sliding angle of 1.2 degrees below 380 degrees C, as well as the excellent color properties (L* = 41.72, a* = 3.01, b* = 62.93) and thermal stability even at 800 degrees C. Incorporation of K -HP not only improves the thermal stability of the heat -resisting paint, but also effectively protects steel plate substrate from damage during the calcining process. Therefore, it is expected to provide a facile approach to fabricate the chromatic self-cleaning heat-resisting paint with excellent thermal stability.