Polyether and polyester poloyols and polyurethane foams are stabilized by including therein stabilizers selected from (1) diphenylaminomethylbenzotriazole substituted by alkyl or phenylalkyl groups or (2) synergistic compositions consisting of (a) benzotriazole or alkylbenzotriazole and (b) secondary aromatic amine substituted by alkyl or phenylalkyl groups wherein the benzotriazole and amine is present in critical ratios.
Furthermore, a method is disclosed for preparation of polyurethane foams from polyols and polyisocyanate that have reduced discoloration due to scorch by adding diphenylamino methylbenzotriazole or compositions of benzotriazole and secondary aromatic amine as scorch inhibitors to the polyol, foaming the polyol and curing.
聚醚和聚酯多元醇以及聚
氨酯泡沫的稳定剂选自 (1) 被烷基或苯基烷基取代的二苯基
氨基甲基苯并三唑或 (2) 由 (a) 苯并三唑或烷基苯并三唑和 (b) 被烷基或苯基烷基取代的仲芳香族胺组成的增效组合物,其中苯并三唑和胺以临界比例存在。
此外,还公开了一种用多元醇和多
异氰酸酯制备聚
氨酯泡沫的方法,通过向多元醇中添加二苯基
氨基甲基苯并三唑或苯并三唑和仲芳香族胺的组合物作为焦烧
抑制剂,使多元醇发泡并固化,从而减少焦烧引起的变色。