油漆和清漆的粘合剂 - 皂化值的测定 - 滴定法

[中文适用范围]： 本文件规定了测定油漆和清漆粘合剂中酯化酸含量的滴定方法，所得结果中必须包括游离酸和酸酐。 由于不同的粘合剂的耐皂化性不同，因此该文献的适用性有限。 如果需要，可以通过使用更长的皂化时间、更浓的氢氧化钾溶液或更高沸点的醇作为溶剂达到更严格的条件下重复试验来检查皂化的完全性。 附录 A 规定了适用于皂化困难的粘合剂的程序。 该方法不适用于那些与碱发生超出正常皂化作用的进一步反应的材料。 [外文原描述]： This document specifies a titrimetric method for determining the esterified-acid content in binders for paints and varnishes, free acids and acid anhydrides being necessarily included in the result obtained. Because different binders vary in their resistance to saponification, this document is of limited applicability. If necessary, completeness of saponification can be checked by repeating the test under more severe conditions achieved by the use of longer saponification time, more concentrated potassium hydroxide solution, or a higher-boiling alcohol as solvent. Annex A specifies a procedure suitable for binders that saponify with difficulty. The method is not applicable to those materials that show further reaction with alkalis beyond normal saponification.