| abstract |
A method for producing a low-density rigid polyurethane foam having excellent filling properties, dimensional stability, adhesiveness, and initial curing properties (curing properties) of a foam by water foaming, and production of an integrally molded article by the production method. Provide a method. In a method for producing a rigid polyurethane foam by reacting a mixture containing an active hydrogen-containing compound, a foaming agent, a catalyst and a foam stabilizer with an organic polyisocyanate, the foaming agent contains water as a main component, and the catalyst contains carbon. It is a potassium organic carboxylate and N-alkylmorpholine having a number of 2 to 4, and in the reaction of the mixture with the organic polyisocyanate, an equivalent ratio of active hydrogen to NCO group is caused to react at a ratio of 100 to 90 to 150. A method for producing a water-foamed rigid polyurethane foam and a method for producing an integrally molded article by the production method. [Selection diagram] Fig. 1 |