Polymer polyols are made in a seeded process, in which styrene and acrylonitrile are polymerized in the presence of a base polyol, a seed dispersion and a solvent. The seed dispersion contains an unsaturated macromer. The process produces a polymer polyol in which the dispersed phase particles have a particle size of 1 to 3 μm and a particle size span of less than 1.25. The polymer polyols are very useful for making flexible polyurethane foam for cushioning applications, in which high airflows and good load bearing are needed.
聚合物多元醇是通过种子工艺制成的,在这种工艺中,
苯乙烯和
丙烯腈在基质多元醇、 种子分散体和溶剂的作用下发生聚合反应。种子分散体含有一种不饱和大单体。该工艺生产出的聚合物多元醇中,分散相颗粒的粒径为 1 至 3 μm,粒径跨度小于 1.25。这种聚合物多元醇非常适用于制造软质聚
氨酯泡沫塑料,用于需要高气流和良好承重的缓冲应用。