【摘要】 在制备聚脲多元醇(PHD)时,如果参与聚合反应的羟基过少,随着反应的进行,聚脲分子量增大,当分子量增大到不能溶于多元醇溶液时,变成固体颗粒并逐步沉淀析出,生成的分散体很不稳定,放置一段时间容易产生沉淀物,通过实践发现在制备PHD中加入少许稳定剂可以很好地提高PHD的稳定性。更多还原

【Abstract】 In the polyaddition reaction, if the proportion of co - reacting hydroxyl functional molecules is too small, the dispersions formed are in danger of being unstable. We find it is surprisingly possible to use some reagents that the dispersions are formed which so stable that they do not sediment.更多还原