Process for preparing rigid foam polyurethane, and polyurethane foam rigid

摘要

Process for preparing rigid polyurethane foams, and rigid polyurethane foam.The invention relates to a method for producing materials of hard foam polyurethane reacting if) poly isocyanates with (b) compounds having at least two hydrogen atoms reactive with two groups of isocyanate in the presence of (c) foaming agents.Characterized in that the compounds having at least two hydrogen atoms reactive with the two groups of isocyanate comprises at least one alcohol polyether B1) having the functionality of 2 to 8 and a hydroxyl number of 200 to 800 mg KOH / g,The said alcohol having been produced through the formation of alkylene oxides B1B) compounds having at least two atom reactive with alkylene oxides B1a) indicated below as starting substances, usnado an amine B1C) as a catalyst.