ASTM D2024-09(2023)由美国材料与试验协会 US-ASTM 发布于 2023-08-02。
ASTM D2024-09(2023)在国际标准分类中归属于: 71.100.40 表面活性剂及其他助剂。
ASTM D2024-09(2023) 非离子表面活性剂浊点的标准测试方法的最新版本是哪一版?
最新版本是 ASTM D2024-09(2023) 。
1.1 This test method covers a procedure to determine the “cloud point” of nonionic surfactants or detergent systems. Cloud Point is the temperature at which dissolved components (solids or liquids) are no longer completely soluble, precipating as a second phase giving the fluid a cloudy appearance. It is limited to those surfactants and detergent systems for which the visible solubility change occurs over a range of 1 °C or less at concentrations of 0.5 % to 1.0 % in DI water between 30 °C and 95 °C. 1.2 Chemical Limitations— Nonionic surfactants that exhibit a characteristic cloud point in general terms consist of a water-in-soluble moiety condensed with 50 % to 75 % by weight of ethylene oxide. If the level of ethoxylation is too low the surfactant may not be water soluble at temperatures less than 30 °C, and if it is too high no cloud point may exist. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
介绍浊点是非离子表面活性剂的特征,代表在一定温度下表面活性剂与水之间的相互作用被破坏。这是由于构成表面活性剂的亲水性基团对水的亲和力降低而发生的。盛泰仪器SH412全自动浊点测定仪 各种添加剂(包括无机盐,非离子和离子表面活性剂,水溶性聚合物和醇)对三种线性非离子表面活性剂的浊点具有影响已被调查。...
浊点 对非离子表面活性剂来说,亲水性取决于醚键的多少,醚与水分子的结合是放热反应。 当温度上升,水分子逐渐脱离醚键,而出现混浊现象,刚刚出现混浊时的温度称浊点。此时表面活性剂失去作用。浊点越高,使用的温度范围广。...
非离子型表面活性剂通过聚氧乙烯基醚醚水合而变为水溶性。含有醚氧的环氧乙烷的较长链更易水合,因此溶解度更高。温度升高导致环氧乙烷基团的醚氧与水合氢之间的氢键断裂成醚氧。结果,胶束的聚集数增加,聚氧乙烯非离子表面活性剂的胶束变得越来越大,直到它们变得如此大以致溶液变得明显混浊 盛泰SH412全自动浊点测定仪 。...
浊点对非离子表面活性剂来说,亲水性取决于醚键的多少,醚与水分子的结合是放热反应。当温度上升,水分子逐渐脱离醚键,而出现混浊现象,刚刚出现混浊时的温度称浊点。此时表面活性剂失去作用。浊点越高,使用的温度范围广。...
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