A polyurethane polyether polyurethane hull and methods for their preparation and production

The present invention discloses a method of producing a polyurethane hull and polyurethane polyethers and their preparation, the polyether comprises: 40-60 parts of polyether polyol A, 10-30 parts of a polyether polyol B, 10-30 parts retardant polyester polyol C, 1.5-2.5 parts of a silicone foam stabilizer, 0.8-1.1 parts of water, 1.4-1.9 parts of catalyst, and 8-14 parts of a physical blowing agent 20-30 parts of a flame retardant; polyether polyol alcohol A 8310 and SU-450L from the complex, the polyether polyol B 305 and / or MN500, flame retardant polyester polyol C is CF625; the polyether and polyphenyl polymethylene polyisocyanates by 1 : (1.2-1.3) were mixed, poured into the closed mold foam molding vessel, i.e., a polyurethane hull. Polyurethane of the present invention the hull of light weight, high compressive strength, low water absorption, good dimensional stability, corrosion resistance, aging resistance, good flame resistance.