衣康酸单酯羧酸盐Bola表面活性剂性能

Properties of Itaconic Acid Based Monoester Carboxylate Bola Surfactant

摘要:

以衣康酸酐(IAn)和聚丙二醇400 (PPG 400)为原料，经过酯化反应和酸碱中和反应制备出衣康酸基聚丙二醇单酯羧酸盐Bola型表面活性剂(Saa-K)。利用1H NMR、FT IR对其结构进行了表征。对Saa-K的表面张力、临界胶束浓度(CMC)、润湿性、泡沫性能等进行了测试，考察了电解质对Saa-K溶液的表面张力和CMC的影响。结果表明：常温常压下，Saa-K的表面张力为32.46 mN/m、临界胶束浓度为1.715×10-2 mol/L；当溶液中Saa-K的质量分数为1%时，Saa-K的第一临界相变温度TK1＜0 ℃；第二临界相变温度TK2为54.3 ℃；当溶液中Saa-K和月桂酸钾(PL)的质量分数均为1%时，Saa-K的起泡高度和泡沫寿命分别为51.13 mL和1940 min，而月桂酸钾的起泡高度和泡沫寿命分别为98.53 mL和2200 min。在阴离子强度相同或阳离子强度相同的情况下，无机电解质的加入均会使Saa-K溶液的表面张力和CMC显著降低，降低程度分别为：LiCl＜NaCl＜KCl和NaBr＜NaCl＜NaF。

Abstract:

Carboxyl-terminated itaconic acid based polypropylene glycol (400) monoester (IPM) was synthesized by itaconic anhydride (IAn) and polypropylene glycol 400 (PPG 400) as the raw material through esterification reaction, and its structure was characterized by Nuclear Magnetic Resonance (1H NMR) and Infrared Spectrometer (FT IR). And then the itaconic acid based polypropylene glycol (400) monoester carboxylate Bola surfactant (Saa-K) was synthesized by neutralization of IPM with potassium hydroxide (KOH). The surface tension, critical micelle concentration (CMC), foaming characteristics, etc. were studied. The surface tension of Saa-K was 32.46 mN/m, CMC was 2.193×10-3 mol/L; TK1 was less than 0 °C, TK2 was 54.3 °C, foaming volume was 55.13 mL, and foaming life was 1940 min.