哑铃状含氟聚合物在柴油乳液中破乳及机理

Demulsification Performance and Mechanism of Fluorinated Copolymers with Dumbbell-shaped Structure in Diesel Emulsions

摘要:

评价了3种具有不同聚乙二醇（PEG）亲水链段长度的哑铃状含氟多嵌段聚合物(Fluorinated Multi-block Copolymers with Dumbbell-shaped Structure, FMCDSs)在0#柴油/水乳液中的破乳性能，并对比了聚醚类破乳剂、哑铃状的聚缩水甘油醚-PEG聚合物的破乳性能。结果显示：FMCDSs比碳氢类聚合物有更佳的破乳性能；FMCDSs的PEG链段长度对破乳性能有显着影响，以PEG-4000为亲水链段的FMCDSs在300 mg/L添加浓度下，30 ℃静置30 min后，可以达到95％的分油率。此外，通过界面张力、界面扩张流变性能表征发现：FMCDSs可以有效吸附到柴油/水界面，而含氟部分是产生良好破乳性能的主要因素。

Abstract:

The demulsification performance of 3 fluorinated multi-block copolymers with dumbbell-shaped structure (FMCDSs) containing different hydrophilic polyethylene glycol (PEG) segment in diesel/water emulsion were investigated, and compared with the demulsification performance of polyether demulsifiers and dumbbell-shaped polyglycerol-PEG polymers. The results show: FMCDSs have better demulsification performance than hydrocarbon polymers; the chain length of PEG has a significant effect on the demulsification performance, and the FMCDSs with PEG-4000 as hydrophilic segments separated 95% oil from the emulsion within 30 min at a dosage of 300 mg/L(30℃). In addition, based on the results of interfacial tension and interfacial dilation rheology measurements, it can be found that FMCDSs can effectively adsorbed to the diesel-water interface, and the fluorined groups are the major factor in producing good demulsification properties.