表面改性对Nano-SiO_2表面电位及乳状液稳定性的影响  

Influence of Surface Modification on Surface Potential and Emulsion Stability of Nano-Silicon Dioxide

作　　者：周志斌 王杰祥[1] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《石油化工高等学校学报》2015年第6期29-33,60,共6页Journal of Petrochemical Universities

基　　金：国家863计划课题(2009AA063402);中石化油气开发重要先导项目(KF-2010-18)

摘　　要：使用硅烷偶联剂KH-550对纳米二氧化硅(Nano-SiO_2)进行表面有机改性。使用Zetasizer 3000电位仪,系统分析KH-550的用量、改性时间以及改性温度等因素对Nano-SiO_2表面ζ电位的影响,得到不同改性条件对Nano-SiO_2表面ζ电位的作用规律,从而建立改性Nano-SiO_2表面ζ电位与有机改性条件的关系。将改性前后的Nano-SiO_2与石油磺酸盐-PS复配,得到改性二氧化硅/表面活性剂(KH550-g-Nano-SiO_2-PS)复合体系。采用界面张力仪(TX-500c),系统研究该复合体系降低油/水界面张力能力,并利用Turbiscan Lab型乳状液稳定性分析仪,系统研究油/水乳状液的稳定性。结果表明,当石油磺酸盐表面活性剂质量分数为0.5%时,该体系油/水界面张力降低至2.30×10^(-2) mN/m,然而当KH550质量分数为5%时,KH550-g-Nano-SiO_2-PS体系能使油/水界面张力降低至5.42×10^(-3)mN/m,达到超低界面张力,且乳化液稳定性最大,此时KH550-g-Nano-SiO_2-PS体系表面ζ电位为-50.1mV,通过表面ζ电位的变化分析了油水界面张力变化及乳状液稳定机理。Nano-silicon dioxide was organic modified with silane coupling agent KH550.The influence of modification conditions on surfaceζ-potential of nano-silicon dioxide was characterized by Zetasizer 3000.The modified nano-silicon dioxide was respectively compounded with petroleum sulfonate.The ability of the composite system for reducing the oil water interfacial tension was measured by interfacial tensiometer TX-500.Turbiscan Lab was applied to analyze the stability of oilwater emulsion.The results showed that petroleum sulfonate system could reduce the oil water interfacial tension to about 2.30×10^-2 mN/m,and modified nano-silicon dioxide and petroleum sulfonate composite system could reduce that to about 5.42×10^-3） mN/m,when the concentration of surfactant was 0.5% and the modified nano-silicon dioxide surface zeta potential was-50.1mV.The oil-water interfacial tension change and mechanism of emulsion stability were analyzed through the changes of surface zeta potential of modified nano-silicon dioxide.

关 键 词：纳米二氧化硅 有机改性 Ζ电位 复合驱油体系 提高采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]