摘要
为揭示不同结构表面活性剂的性能特征，对棕榈酸二乙醇胺聚氧乙烯醚磺酸盐钠（PDES）和油酸二乙醇胺聚氧乙烯醚磺酸盐钠（ODES）两种磺酸盐型阴-非离子表面活性剂的表面活性性能进行了研究。结果表明： DPES和ODES溶液的临界胶束浓度ccmc分别为1.14×10-3、6.67×10-4 mol/L，相对应的表面张力γcmc分别为38.40和35.68 mN/m；随着温度和矿化度升高，ccmc逐渐减小，γcmc逐渐降低。DPES和ODES的Krafft点均低于常规阴离子表面活性剂，分别为17℃和14℃，浊点均大于110℃，溶解性好，具有优良的抗高温性能。质量分数0.5%的PEDS和ODES在Na+浓度为100 g/L或Ca2+浓度为4 g/L的矿化水溶液中均未出现沉淀，表现出了极强的耐盐性能。
Abstract
anionic-nonionic sulfonate surfactant has advantages both of anionic surfactants and nonionic surfactants, containing one hydrophobic chain and two hydrophilic-chains consisted of ethylene oxide chain (EO) and sulfo group,which endow the surfactants with unique surface-active properties, especially in temperature resistance and salt tolerance. The surface activie properties of two surfactants, named as sodium palm diethanolamine polyoxyethylene ethers sulfonate (abbreviated as PDES), sodium oleic acid diethanolamine polyoxyethylene ethers sulfonate (abbreviated as ODES) were investigated. The results showed that, the critical micelle concentrations ccmc of the PEES and ODES were 1.14×10-3 and 6.67×10-4 mol/L, respectively, the relative surface tensions γcmc were 38.40 and 35.68 mN/m, respectively. With the salinity and temperature increasing, the values of ccmc and γcmc decreased a little. The Kraftt points of PEDS and ODES was lower than that of the conventional anionic surfactants, being of 17℃and 14℃, respectively, and their cloud point were both higher than 110℃, exhibiting good water-solubility and temperature resistance. In addition , when the PEDS or ODES solutions with mass fraction of 0.5% in 100 g/L Na+ salt solution or 4 g/L Ca2+ salt solution, there was no precipitation, which indicated that PEDS and ODES had excellent salt-tolerant ability.
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