表面活性剂对乳状液膜稳定性的影响

Influence of Surfactant on Stability of Multiple Emulsion Membrane

本文用显微镜分别考察了3种不同表面活性剂对液膜状态的影响,用激光粒度仪分析了表面活性剂对乳状液颗粒大小及分布的影响,用pH酸度计测定W/O/W多重乳状液膜体系外水相的pH值。结果表明:3种不同的表面活性剂(失水山梨糖醇酐单油酸酯span80、双烯基丁二酰亚胺T153、多烯基丁二酰亚胺T152)在膜溶剂含量为50 mL、载体含量2%、液体石蜡含量2%、内相NaOH浓度为0.5 mol/L及乳水比为1∶6条件下制得W/O/W型多重乳状液膜。span80所形成乳状液膜外水相pH值最大,膜破损严重;而T153所形成的乳状液膜外相pH值相对较小,乳状液膜较稳定。3种不同表面活性剂所形成的W/O乳状液在水分散相中平均粒径大小顺序为:T153(60.369μm)>T152(58.510μm)>span80(37.630μm),且T153形成乳状液的粒度分布最集中。乳水比为1∶5、初始硫离子含量为40 mg/L时,由T153所形成乳状液对硫离子的脱除率最高,达98%。

The influence of three different surfactants （sorbitan （Z）-mono-9-octadecenoate Span 80, dialkenyl succinimide T152, multialkenyl succinimide T153 ） on the state of liquid membrane was studied by microscope. The effect of surfactant types on the particle size distribution of emulsion was analyzed by laser particle analyzer, and the pH value of the aqueous phase out of the W/O/W multiples emulsion film system was tested by pH meter. The results showed that, when the W/O/W multiple emulsion film were prepared under the conditions of 50 mL of the film solvent, 2% of the carrier, 2% of the atoleine, 0. 5 mol/L of the interior phase NaOH and 1：6 of the emulsion water ratio. The pH value of the aqueous phase out of the emulsion film formed by Span 80 was the biggest and the film was damaged seriously, while the pH value formed by the T153 was smaller than others and the film was more stable. The mean grain size order of the aqueous dispersive phase in the W/O emulsion formed by the three surfactants was as follows ： T153 （60. 369 μm） 〉 T152 （58. 510μm） 〉 Span80 （37.630 μm）, moreover, the particle size distribution of the emulsion formed by T153 displayed the most intensively. When the emulsion/water ratio was 1：5 and the initial sulfide content was 40mg/L, the desulfuration efficiency of the W/O/W multiples emulsion film formed by T153 was the maximum, being of 98%.