INTRODUCTION Fly ash floating beads were aluminosilicate inorganic powder materials, extracted from fly ash, mainly composed of SiO2 and Al2O3, generally grey in colour, transparent hollow glass spheres under the microscope. Fly ash floating beads had a variety of features, such as light mass, wear resistance, reflective, radiation resistance, high temperature resistance, acid and alkali resistance, self-lubricating, etc 1-7 . Fly ash floating beads were widely used in rubber, plastics,

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... s, coatings and functional materials and other fields. Due to the physical and chemical characteristics of fly ash floating beads, the dispersion of fly ash floating beads in polymer and the interfacial adhesion between fly ash floating beads and polymer were poor, which might result in two-phase separation 8,9 . Therefore, fly ash floating beads needed to be modified to improve the compatibility with polymer. Because of the broad applicability and the better modified effect, silane coupling agent was widely used in the field of polymer. General principles of selecting silane coupling agent were as follows: vinyl silane for polyolefin, sulfur silane coupling agent for sulfur vulcanized rubber, epoxy or ammonia silane for epoxy resin. This paper studied the fire-resistant properties of ultra-thin fire retardant coatings for steel structure prepared by modified fly ash floating beads