A polyether polyol-based premix was prepared, and bulky rigid polyurethane based on it was prepared by free foaming techniope. Some factors in core-scorch controlling are discussed.

• 制备了聚醚组合料，并采用自由发泡工艺制备大体积硬质聚氨酯泡沫塑料，讨论了控制泡沫烧芯的有关因素。