Porous ceramsite loaded nano composite flame retardant and coating method

The invention belongs to the technical field of asphalt pavement safety, provides a porous ceramsite loaded nano composite flame retardant and a coating method and solves problems of direct mixing, low mixing amount, component singleness, proneness to agglomeration, quickness in release and poor flame retardation and smoke inhibition effects. The method includes: cleaning and drying porous ceramsite, adding the porous ceramsite into TiCl4 solution, performing water bath complete evaporation and drying, and adopting NaOH for washing ceramsite to neutral; then, dipping the treated porous ceramsite into salt solution containing nano composite flame retardant ions, and well stirring and mixing; adding ammonium hydroxide, well stirring at a room temperature, depositing the nano composite flameretardant on the inner surfaces of the porous ceramsite in a liquid phase, and calcining in a muffle furnace; finally, uniformly coating the nano composite flame retardant particle porous ceramsite with epoxy resin to form a