标准摘要
[中文适用范围]： 本部分 ISO 4629 规定了测定颜料和清漆结合剂及其溶液中游离羟基的乙酸酐法。这些羟基可能以多元醇、部分酯、聚酯胺或羟基化脂肪酸的形式存在。此方法不适用于同时含有羟基和环氧基团的树脂，因为后者也会被包含在结果中。此外，该方法也不适用于纤维素硝酸酯或酚醛树脂。注意：对于结合剂溶液，在测定结合剂的羟值时，必须考虑到结合剂溶液中的其他成分可能含有羟基的可能性。 [外文原描述]： ISO 4629-1:2016 specifies a titrimetric method for determining the free hydroxyl groups in binders and binder solutions for paints and varnishes. The hydroxyl groups may be present as polyhydric alcohols, partial esters, polyester end groups or hydroxylated fatty acids. This method is not applicable to resins containing both hydroxyl groups and epoxy groups, because the latter will also be included in the result. Also the method is not applicable to cellulose nitrate or to phenolic resins. NOTE 1 If, in the case of binder solutions, the hydroxyl value of the binder only is to be determined, the possibility that other constituents of the binder solution may contain hydroxyl groups has to be taken into account. NOTE 2 A method for the determination of the hydroxyl value of epoxy resins is specified in ISO 7142[1].
英文名称Binders for paints and varnishes — Determination of hydroxyl value — Part 1: Titrimetric method without using a catalyst