| 摘要 |
A process for producing a urethane-modified polyisocyanurate foam comprises mixing a polyisocyanate component, a polyl component containing an aromatic polyester polyol, a catalyst, a foaming agent, a surfactant and other additives under high pressure in a mixing head and then spraying the resultant mixture to expand the foaming ingredient therein. The process uses, as the catalyst, at least three compounds of N,N',N''-tris(dimethylaminopropyl)-S-hexahydrotriazine, an alkali metal carboxylate and a lead compound in combination.
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