Spray-coating type polyurethane combined material for waterproofing and heat insulation of building and application method thereof

The invention discloses a spray-coating type polyurethane combined material for waterproofing and heat insulation of building, which is prepared from the following raw materials: polymer polyol, isocyanate, a chain extender, a flame retardant, a catalyst, a foaming agent and a foam stabilizer. According to the patent of invention, the excellent-performance flame-retardant polyurethane combined material for waterproofing and heat insulation of building is researched, and then a field spray coating manner is adopted, namely A and B raw materials are respectively injected into spray guns according to the ratio from metering pumps, uniformly mixed in a mixing chamber under high pressure action, and atomized and sprayed to rapidly foam and form, so that a layer of continuous, compact and jointless foams is formed on the surface of the building, can play a role of heat insulation, can also play roles of sound insulation, waterproofing and the like, and simultaneously has better flame retardancy. The novel building waterproof and heat-insulation material has the characteristics of superior performance, simpleness and convenience for construction, low construction cost, long service life and the like.