稠油降黏剂与树形大分子破乳剂的界面相互作用

利用界面膨胀流变仪和原子力显微镜(AFM)研究了2种稠油降黏剂OP 10和AES对树形大分子破乳剂SD 1的界面性质和聚集行为的影响,从界面膜角度分析2种降黏剂对稠油乳状液破乳的影响。结果表明,由于3种表面活性剂具有较高的表面活性,在界面层中具有较快的弛豫过程,因而界面弹性模量显示出明显的频率依赖性。在SD 1破乳体系中加入降黏剂OP 10后,因OP 10分子与界面聚集体之间存在快速交换过程,使界面弹性模量降低,促使脱水率升高。在SD 1破乳体系中加入降黏剂AES后,因AES分子能够插入SD 1分子聚集体中,减弱AES分子极性头基之间的静电斥力;同时SD 1分子中的EO基团在水中吸附质子带微弱正电荷,与AES分子产生微弱的静电引力,形成层状结构的混合胶束,致使混合界面膜的界面弹性模量高于SD 1吸附膜,因而脱水率降低。

The Interfacial Interactions Between Viscosity Reducer and Dendrimer Demulsifer

The interfacial expansion rheometer and atomic force microscopy were used to investigate the interfacial properties and aggregation behavior of OP 10 and AES viscosity reducers in the absence or presence of demulsification SD 1. The effects of the two viscosity reducers on the crude emulsion breaking were also studied from the perspective of oil water interfacial film. The results showed that the three surfactants mentioned above all provided the new fast relaxation process, involving the exchange of surfactant molecules between monomers and mixed micelles at interface, which resulted in time dependence of interface elastic modulus data due to their high surface activities. When OP 10 was added in the system containing SD 1, there was a rapid exchange process between the interfacial aggregates, causing the reduction of interface elastic modulus and the increase of dehydration rate. Addition of AES in the system containing SD 1 could make the interface elastic modulus increasing and the dehydration rate obvious decreasing due to the electrostatic interaction between SD 1 and AES.