Polyurethane Foam is generally room temperature foam molding process is relatively simple. Construction can be divided according to the degree of mechanization and mechanical foaming foaming hand; foaming pressing force can be divided into low-pressure and high-pressure foam foam; press molding can be divided into pouring foam and spray foam. First, the advantages of foamed polyurethane Foamed polyurethane two-component composition, divided into Group A polyol, isocyanate into Group B, the construction of the two components into the mixing spraying machine spray, mist, one minute solidified foam molding. This material is introduced only in recent years for building insulation waterproof after two or three years of use, there is more understanding, it has many advantages, using a wide range. 1, good insulation properties. Thermal conductivity of about 0.025, better than polystyrene board, building insulation is the preferred material. 2, waterproof performance. Foam hole is closed, the closure rate of 95%, the rain will not seep from the past between the holes. 3, because the scene spraying, to form an overall waterproof layer, no seams, no less than the polymer membrane, reduce maintenance workload. 4, good bonding properties. Able to wood, metal, masonry, glass and other materials bond very strong, not afraid of wind lift. 5, for the new crop or old roofing roof repair are particularly suitable for the repair of the old roof, do not eradicate the original waterproof layer and the insulation layer, simply clear the gray surface of the sand debris, you can spray. 6, the construction is simple and fast. Per day per worker can be sprayed over 200 square meters, it is conducive to grab progress. 7, endcaps simple structure. Spray polyurethane foam endcaps, without special treatment, greatly simplified. Such as the use of the web, in the parapet, which needs to stay groove, closed head in the groove; if not leave grooves required flat iron nail close the first seal, but also painted caulk. 8, good economic returns. If the insulation layer and the water layer separated, not only the high cost and long duration, and foamed polyurethane once survived. 9. A good anti-aging. According to foreign engineering summary and have been informed by research and testing, anti-aging life of up to 30 years. Second, the application of foamed polyurethane 1, flat roofing insulation Exalted roof plus a color spray paint as a protective layer; Master roof, sitting on the tile pulp. 2, tile roof sloping roof will foamed polyurethane spray in sight along the board, tile board seat syrup in sight, the slide does not occur. 3, wall insulation polyurethane foam used as wall insulation installed more advantages. Large wall with spray plate intercostal, bonding good and tight. Such as hollow blocks, foamed polyurethane can be sprayed in a hole, stuffed full of filling the walls of cold storage, spraying is preferred. The current reform of the wall insulation technology is very critical, foamed polyurethane can be grand plans. 4, basement waterproofing wall insulation, polyurethane foam is the site to show their talents, both insulation, waterproof, and eliminates the need for additional protective layer, one fell swoop, too. Third, the disadvantage of foamed polyurethane Although urethane foam there are so many advantages, but it is not a panacea, there are weaknesses and inappropriate place. 1, at a temperature of 10 ℃ with BU, the foaming rate. So obviously restricted season use. 2, bathroom toilet waterproof and not just insulation, polyurethane foam should not be used. 3, foamed polyurethane spray forming speed, easy to spray very smooth, rugged part of the normal. For roofing insulation, flatness can be relaxed, but the gutters, gutter flatness is not good, it will affect the drainage flow rate. It needs to be used in conjunction with other waterproof material, in which the amount of polyurethane products in the second only to soft polyurethane foam. Polyurethane foam, mostly closed-cell structure, a heat insulation, light weight, high strength, easy construction and other excellent features, but also with noise, vibration, electrical insulation, heat, cold, solvent resistance and other characteristics, widely used refrigerator, freezer box insulation, cold storage, refrigerated trucks and other insulation materials, buildings, storage tanks and pipe insulation materials, a small amount for non-adiabatic occasions, such as imitation wood, packaging materials. In general, the lower density polyurethane foam is mainly used as insulation (insulation) material, high-density polyurethane foam used as structural materials (imitation wood). Polyurethane Foam is generally room temperature foam molding process is relatively simple. Construction can be divided according to the degree of mechanization and mechanical foaming foaming hand; foaming pressing force can be divided into low-pressure and high-pressure foam foam; press molding can be divided into pouring foam