ISO 4327-1979 非离子表面活性剂 聚烷氧基化衍生物 羟值的测定 邻苯二甲酸酐法

标准号：ISO 4327-1979
中文标准名称：非离子表面活性剂 聚烷氧基化衍生物 羟值的测定 邻苯二甲酸酐法
英文标准名称：Non-ionic surface active agents; Polyalkoxylated derivatives; Determination of hydroxyl value; Phthalic anhydride method
标准类型：G72
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：G72
国际标准分类号：71.100.40
适用范围：The hydroxyl groups are esterified by phthalic anhydride in pyridine solution. The excess of phthalic anhydride is hydrolyzed with water containing in the sodium hydroxide solution used for the neutralization. The acidity which appears during the esterification and of the phthalic acid formed during the hydrolysis is neutralized by sodium hydroxide solution in the presence of phenolphthalein as indicator. The hydroxyl value is calculated from the difference between the volumes of sodium hydroxide solution used for the titration of the blank and of the test solution.