塑料

[中文适用范围]： 本文件规定了两种测量用作聚氨酯原料的多元醇羟基数的方法。确定多元醇的羟基含量以正确配制聚氨酯体系。方法 A 主要适用于易酯化的聚醚多元醇。它也适用于具有显著空间位阻的多元醇，例如基于糖的多元醇。方法 B 适用于聚醚多元醇、聚合物多元醇和胺引发多元醇，但对于空间位阻多元醇，结果会很低。如果采取预防措施来验证适用性，则可以通过这些方法分析其他多元醇。这些方法可用于研究以及质量控制和规范目的。 [外文原描述]： This document specifies two methods for the measurement of the hydroxyl number of polyols used as polyurethane raw materials. The hydroxyl content of polyols are determined to properly formulate polyurethane systems. Method A is primarily applicable to readily esterified polyether polyols. It is also intended for polyols which have significant steric hindrance, such as those based on sugars. Method B is intended for polyether polyols, polymer polyols and amine-initiated polyols, but can give low results for sterically hindered polyols. Other polyols can be analysed by these methods if precautions are taken to verify applicability. These methods can be used for research and for quality control and specification purposes.