摘要
以环氧氯丙烷、二甲胺和溴代烃为原料合成了低聚季铵盐MD-I和MD-II。通过衰减全反射-傅立叶变换红外光谱( ATR-FTIR)、X射线衍射(XRD)、扫描电镜(SEM)分析以及测定接触角研究了MD-I和MD-II在天然岩心上的吸附行为。ATR-IR分析表明MD-I和MD-II在岩心上均吸附成膜，且分子在膜中具有特定的排列取向；XRD分析表明经MD-I或MD-II处理后岩心晶面间距未发生明显变化，晶形结构未发生改变；SEM照片显示经MD-I处理的岩心表面微观结构未发生明显改变，而经MD-II处理的岩心表面有细长突起。接触角测定结果表明油湿表面天然岩心薄片(水接触角为96.7°) 分别吸附有两种低聚季铵盐MD-I和MD-II后转变为弱水湿，水在经MD-I或MD-II处理后天然岩心表面的接触角分别为34.1°和44.5°)，其中MD-I吸附平衡后改变岩石表面润湿性能力更明显。
Abstract
Oligomeric quaternary ammonium salts MD-I and MD-II were synthesized from epichlorohydrin, dimethylamine and bromo hydrocarbons. Adsorption behaviors of the cationic oligomeric quaternary ammonium salt on natural sandstone surface were studied through attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), X ray diffraction (XRD), scanning electron microscopy (SEM) analysis and the determination of contact angle. ATR-IR analysis showed that MD-I and MD-II were adsorbed on the surface of the sandstone to form thin film, moreover, MD-I and MD-II molecules in the membrane had a specific alignment; X ray diffraction analysis indicated that the crystal plane spacing and the crystalline structure of two treated cores was not significantly changed; Environmental scanning electron microscopy results showed that surface structure of the sandsone treated by MD-I had not significantly altered, however, the surface of the sandstone treated by MD-II gave some slender materials. And oil wet surface of natural sandstone slice (water contact angle of 96.7°) adsorbed by two aqueous oligomeric quaternary ammonium salt(MD-I and MD-II), respectively, turned to be water-wet (water contact angle of 34.1° and 44.5°, respectively), thereinto, after adsorption equilibrium, MD-I could change the wettability of surface of the sandstone more obviously.
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