无机盐和尿素对直链烷基苯磺酸钠浓溶液粘度性质的影响

The Effect of Inorganic Salts and Urea on the Viscosity Behavior of Sodium Linear Alkyl Benzesulfonat Solution with High Concentration

在303.2±0.1K,测定了直链烷基苯磷酸钠广(SLABS)、硫酸锂、硫酸钠、碘化钠和尿素溶液对水的相对粘度-浓度曲线;SLABS与添加剂的混合溶液对原 SLABS溶液的相对粘度-浓度曲线·测定表明,无机盐对 SLABS浓溶液有显著的增粘效果.各种盐所达到的最大粘度有显著差别.盐达到一定浓度会与SLABS形成沉淀,其增粘能力达到极限.这些结果用胶团溶液结构,离子与胶团的相互作用,离子的水合能力,水结构改变和活度积效应来解释.尿素明显地降低SLABS浓溶液的粘度 用硫酸钠增粘时,尿素浓度越高最大粘度越低,相应的盐浓度越高.这些结果用尿素与水合单体(表面活性剂)形成尿合单体,使参与水合单体与胶团平衡的SLABS实际浓度降低来解释.

The relative viscosity-concentration curves of sodium linear alkyl benzesulfonat (SLABS), 1/2·Li2SO4, 1/2·Na2SO4, NaI and N2H4 CO solutions vs. water and of mixed solutions of SLABS and additive vs the SLABS solution have been determined at 303.2± 0.1K. The determinations show, the thickening efficiency of inorganic salts is remarkable for concentrated SLABS solutions. The maximum viscosity values which various salts can reach are markedly different. When the salt concentration reaches a certain value, SLABS forms a precipitate with the salt and the thickening ability of the salt reaches its limit. These results are interpreted in terms of the structure of the micelle solution, electrostatic interactions between ions and micelles, ionic hydratability, changes in the water structure and an activity product effect. Urea diminishes markedly the viscosity values of concentrated SLABS solutions. When using 1 / 2·Na2SO4 as a thickening agent, the higher the concentrations of urea are, the lower the maximum viscosity values are and the higher the concentrations of salt corresponding to the values. These results are interpreted in terms of forming the individual of urea adduct between urea and the hydrated individual (of surfactant), and dimishing SLABS actual concentration of the equilibria between the hydrated individual and micelle.