EDTA interfacial chelation Ca2+ incorporates superhydrophobic coating for scaling inhibition of CaCO3 in petroleum industry
Mingliang Zhu, Huijuan Qian, Ruixia Yuan, Dongyan Zhao, Haichao Huang, Huaiyuan Wang
Abstract
Abstract In this paper, the superhydrophobic poly(vinylidene fluoride)/fluorinated ethylene propylene/SiO 2 /CNTs-EDTA (PFSC-EDTA) composite coating was successfully fabricated and applied for anti-scaling performance. The deposition of CaCO 3 on the surface of the superhydrophobic PFSC-EDTA composite coating reached 0.0444 mg/cm 2 for 192-h immersion into the supersaturated CaCO 3 solution, which was only 11.4% that of the superhydrophobic PFSC composite coating. At the interface between the CaCO 3 solution and the PFSC-EDTA coating, the Ca 2+ could be firstly chelated by EDTA that was benefit for improving the anti-scaling performance of the superhydrophobic PFSC-EDTA composite coating. In another hand, the addition of EDTA to the CNTs played an important role in fabricating the SiO 2 -centric and CNTs-EDTA-surrounded multilevel micro–nanostructure in the superhydrophobic PFSC-EDTA composite coating, in favor of maintaining the air film under the water and the stability of the superhydrophobic surface. The research supplies a new way of improving anti-scaling performance of superhydrophobic coating by incorporating the organic chelating agent at the interface and changing the traditional way of scale prevention.