Superior anti‐smudge and flame retardancy of polydimethylsiloxane composite coating with phosphorus modified CO0.5Ni0.5Fe2O4

In this work, the CO0.5Ni0.5Fe2O4 nanoparticles modified by phosphoric acid and NCO groups were prepared as flame‐retardants and cross‐linking centers. After modification, the dispersibility and flame‐retardant properties of the nanoparticles were effectively improved. On this basis, a kind of two‐component polyester‐based anti‐smudge and flame retardant hybrid coating in situ polymerization was prepared by using dihydroxy mono‐terminated PDMS to provide low surface energy, dipentaerythritol (Di‐PE) as a charring agent to provide sufficient cross‐linking sites. Water, ink, pump oil, and cooking oil could slide off the coated surface without leaving any traces. These novel hybrid coatings exhibit excellent anti‐graffiti properties and corrosion resistance even with 2 wt% PDMS and 3 wt% modified nanoparticles content. Moreover, Si, P, and CO0.5Ni0.5Fe2O4 all resulted in the formation of a char protective layer during burning. The thermal properties and flame retardant properties of the hybrid coatings were significantly improved. The peak heat release rate (PHRR) curves and the smoke production rate (PSPR) of hybrid coatings (3 wt% modified CO0.5Ni0.5Fe2O4) decreased by 44.2%, 55.7%, respectively, compared with pure composites. Besides, the hybrid coatings can be applied to a variety of substrates, including glass, steel, and fabric.