Fluorine-free, robust, flame-retardant superhydrophobic coating based on a novel branched thiol-ene alkylated siloxane nanocomposite

Controlling the structure, chemical and thermal properties of the material surface is crucial to improve the utilization of resources and reduce energy consumption. In this work, a simple, fluorine-free spraying strategy is adopted to build a high-performance superhydrophobic coating. The superhydrophobic layer is obtained by mixing the adhesive (prepared by UV-assisted click reaction) with particles of different scales. Octa(3-glycidyloxypropyl) polyhedral oligomeric silsesquioxanes (GPOSS) with phenylphosphonic acid are added to achieve flame-retardant effect. The coating exhibits the excellent superhydrophobicity (WCA = 165°), self-cleaning and mechanochemical durability even under severe environments such as harsh abrasion, high temperatures, UV exposure and other strong alkaline substances. In addition, the coating has anti-icing, resistant to metal corrosion and exhibits excellent flame-retardant properties (pkHRR reduced by 30.2 %). The technology can provide technical support and theoretical basis for the application of high-performance special wetting materials in the field of energy conservation and environmental protection.