Disclosed are novel polyol blends comprising a polyester polyol, a tertiary amine polyurethane catalyst, and an organic carboxylic acid having a dissociation constant less than 1 x 10⁻³ and which does not readily decarboxylate wherein the carboxylic acid is present in the proportions that its equivalent weight is at least equal to the equivalent weight of the tertiary amine. Also disclosed is the method for stabilizing blends of the above polyester polyols and tertiary amines by adding the carboxylic acid in at least equal equivalent weight to the amine present in the blend.
Both polyurethane and polyurethane-polyisocyanurate foams prepared from the novel blends are also disclosed.
公开了新型多元醇混合物,该混合物包含聚酯多元醇、叔胺聚
氨酯催化剂和离解常数小于 1 x 10-³且不易脱羧的有机
羧酸,其中
羧酸的存在比例为其等效重量至少等于叔胺的等效重量。此外,还公开了稳定上述聚酯多元醇和叔胺混合物的方法,即在混合物中加入与胺至少等当量的
羧酸。
还公开了用新型混合物制备的聚
氨酯和聚
氨酯-聚异
氰脲酸酯泡沫塑料。