Preparation method of polyurethane-nano kaolin composite material

The invention relates to a preparation method of a polyurethane-nano kaolin composite material. The composite material mainly comprises polyurethane and nano kaolin. The preparation method is as follows: firstly, carrying out organic intercalation modification on the nano kaolin to obtain organically modified nano kaolin with larger interlamellar spacing; and then using a body-(in-situ) intercalative polymerization method to prepare the polyurethane-nano kaolin composite material. The preparation method is characterized in that the nano kaolin with lower price and better performance is utilized, the composite material is a novel efficient halogen-free retardant agent, and no benzene, toluene, N,N'-dimethyl formamide, ethyl acetate and other harmful solvents are used, therefore environmental requirements are met. By adding a small amount of kaolin, the mechanical property, heat insulation performance and heat resistance of the polyurethane elastomer can be significantly improved. In addition, the material has simple preparation process, low cost and excellent integrated performance, and can be widely applied to mining equipment, sports equipment, area pavement materials and other industries, thereby having wide market prospects.