| 摘要 |
To provide a process capable of producing a light-weight rigid open-cell foam by a spraying method using mainly or solely water as a blowing agent, wherein a polyol system liquid is excellent in storage stability even when the blowing agent is used in a large amount, and the foam is excellent in dimensional stability without sagging and capable of forming a uniform thermal insulation layer having an excellent appearance for the purpose of constructing a whole house. A liquid component (X) which comprises a polyol (P) comprising polyols (A), (B) and (C) in a prescribed ratio, a blowing agent, a surfactant and a catalyst, and a liquid component (Y) which comprises a polyisocyanate compound, are mixed and reacted for curing by a spraying method. (A) is a polyol that has a hydroxy value of from 100 to 900 mgKOH/g, contains no nitrogen atom and has from 2 to 8 functionality. (B) is a terminal oxyethylene group-containing polyol that has a hydroxy value of from 20 to 56 mgKOH/g, contains no nitrogen atom and has from 2 to 8 functionality. (C) is a polyol that has a hydroxy value of from 50 to 350 mgKOH/g, contains nitrogen atoms, has from 3 to 5 functionality, and contains oxyethylene groups and other oxyalkylene groups. |
