A composition and process useful to make flexible polyurethane foams and in particular flexible molded polyurethane foams is disclosed. The usage of dipolar aprotic liquids such as DMSO, DMI, sulfolane, N-methyl-acetoacetamide, N, N-dimethylacetoacetamide as well as glycols containing hydroxyl numbers OH# ≤ 1100 as cell opening aides for 2-cyanoacetamide or other similar molecules containing active methylene or methine groups to make a polyurethane foam is also disclosed. The advantage of using cell opener aids results in a) no foam shrinkage; b) lower use levels of cell opener; c) foam performance reproducibility d) optimum physical properties. In addition, combining the acid blocked amine catalyst together with the cell opener and the cell opener aid results in a less corrosive mixture as well as provides a method that does not require mechanical crushing for cell opening.
本发明公开了一种用于制造软质聚
氨酯泡沫,特别是软质模塑聚
氨酯泡沫的组合物和工艺。本发明还公开了使用二极性烷基液体,如
二甲基亚砜、
二甲基亚砜、N-甲基乙酰乙酰胺、N, N-二甲基乙酰乙酰胺以及含有羟基数 OH# ≤ 1100 的
乙二醇作为 2-
氰基乙酰胺或其他含有活性亚甲基或甲基的类似分子的开孔助剂来制造聚
氨酯泡沫。使用开孔助剂的优点是:a) 泡沫不会收缩;b) 开孔剂用量较少;c) 泡沫性能可再现;d) 物理性能最佳。此外,将酸性封端胺催化剂与开孔剂和开孔助剂结合在一起,可产生腐蚀性较低的混合物,并提供了一种无需机械破碎即可开孔的方法。