| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for easily producing a polyisocyanurate foam having initial adhesive strength on expansion and permanent adhesive strength, high dimensional stability and good flame retardancy by using water as the foaming agent in particular, without varying reaction balance and reaction product composition through improving both the miscibility and flowability of a stock solution during expansion reaction. SOLUTION: This method for producing a polyisocyanurate foam involves using (A) an organic polyisocyanate, (B) polyol(s), (C) a trimerization catalyst, (D) a foaming agent, (E) a foam stabilizer, (F) a flame retardant and (G) an auxiliary, wherein it is characteristic that the polyol(s) B essentially comprises a phthalic acid-based polyester polyol b1, the equivalent ratio of the total isocyanate groups to total active hydrogen groups is 1.5-8.0, and as the auxiliary G, at least one kind of compound of the formula (1): R1 -(O-R3 )n -O-R2 (R1 and R2 are each a >=1C univalent hydrocarbon group; R3 is at least one >=2C bivalent hydrocarbon group; and (n) is an integer of >=1) is added at 0.2-4.0 mass% based on the polyurethane foam raw materials. |
