Synthesis and properties of novel betaine fluorocarbon surfactants

Abstract

In this study, a series of new betaine fluorocarbon surfactants (abbreviated as FSC-m) were synthesized with N,N-dimethyl-1,3-propane diamine, perfluoroalkyl sulfonyl fluoride, and sodium chloroacetate. The novel surfactants were characterized by FI-IR, ¹H-NMR and ¹⁹F-NMR. The surface activity of these surfactants at the air-water interface was investigated. The oil-water interfacial tension, adsorption, and wettability were studied on the oily drilling cuttings. The results showed that the novel surfactants have excellent surface and interfacial activities and low CMC. The novel surfactants can rapidly absorb at oily drilling cuttings, and their isotherm adsorption curve is L-shaped, with single-molecule Langmuir adsorption characteristics. FSC-m dramatically affected the wettability of oily drilling cuttings, such that the oil drop contact angle increased to 75.5° and the water drop contact angle increased to 117.2°, thus reducing the adhesion of the oil phase to the drilling cuttings. These surfactants can be applied to the oil removal technology of oily drilling cutting and they have a broad application prospect.

Graphical Abstract

Keywords:

• Betaine fluorocarbon surfactant
• surface activity
• adsorption
• wettability
• oily drilling cuttings

Disclosure statement

The authors declare no conflicts of interest regarding the publication of this manuscript.

Additional information

Funding

This article were funded by China Petroleum Fundamental Scientific Research and Strategic Reserve Technology Research Fund (2017D-5008); special topic “Mechanism and Technology Research on Preparation of Micro-nano Adsorbent Materials and Removal of Oil-Based Drilling Oil Pollutants”; China Petroleum Fundamental Scientific Research and Strategic Reserve Technology Research Fund.