改性皂类渗透剂壬基苯氧乙酸钠的合成及性能

Synthesis and Properties of Sodium 2-(4-Nonylphenoxy) Acetate: a Modified Soap-like Penetrating Agent

摘要:

在普通脂肪酸钠皂的直链烷基中引入苯氧基，合成了一种改性羧酸皂类表面活性剂——壬基苯氧乙酸钠(SNA)。采用FT-IR和1H-NMR方法对其结构进行表征，通过两相滴定法和HPLC法测得产品纯度>98%。测定了SNA的Krafft点(TK)及其在pH 7和pH 10条件下的表面张力、润湿力、泡沫力、钙离子稳定性、钙皂分散剂消耗量和乳化力等性能，并与油酸钠(SOA)及十二烷基苯磺酸钠(LAS)比较。实验结果表明：SNA具有极好的低温溶解性(TK < 0 °C)；不依赖于pH的优秀的润湿性能(润湿时间< 25 s)，远远优于SOA的润湿力(>15 min)；且具有不依赖于浓度的很好的消泡性能。因此，SNA具有作为羧酸皂类低泡渗透剂的应用潜能。

Abstract:

By introducing a phenoxy group into the straight alkyl group of the sodium soap of ordinary fatty acids, a novel modified soap——sodium 2-(4-nonylphenoxy) acetate (SNA) was synthesized. The molecular structure of the product was identified by FT-IR and 1H-NMR, and the purity of 98% of the product was confirmed by the results of two phase titration and HPLC measurement. Performance of SNA was measured both at pH 7 and pH 10, such as Krafft point (TK), surface tension, wetting time (WT), foam ability, calcium stability, lime soap dispersing requirement and emulsifying power, which was further compared with sodium soap of oleic acid (SOA) and sodium dodecylbenzene sulfonate (LAS). The experimental results show that SNA has the excellent solubility at low temperature (TK < 0 °C); the excellent pH-independent wettability (WT = 25 s) compared to SOA (WT  15 min); and the good concentration-independent defoamability. Therefore, SNA has the potential as a novel low-foaming soap-type penetrating agent.