| abstract |
A polyurethane foam excellent in flame retardancy is formed on-site. An in-situ foaming system for on-site formation of a flame retardant polyurethane foam comprises: (A) a first liquid containing polyisocyanate; (B) a second liquid containing polyol; (C) a trimerization catalyst; (D) foaming agent, (E) foam stabilizer, and (F) red phosphorus, phosphate ester, phosphate-containing flame retardant, bromine-containing flame retardant, boric acid-containing flame retardant, antimony-containing flame retardant, and metal And an additive containing at least one selected from hydroxides. [Selection figure] None |