Fluorine-containing phosphate surfactant and preparation method thereof

Abstract

The invention discloses a fluorine-containing phosphate surfactant and a preparation method thereof. The preparation method comprises that 4-perfluoroalkenoxybenzene sulfonyl chloride and 2-methylaminoethanol as raw materials undergo a reaction in an organic solvent in the presence of an acid binding agent at a temperature of 0-150 DEG C for 2-12h, the product is treated to form N-ethoxy-N-methyl-4-perfluoroalkenoxybenzsulfamide, the N-ethoxy-N-methyl-4-perfluoroalkenoxybenzsulfamide and an inorganic phosphorus compound are mixed and undergo a reaction at a temperature of 30-200 DEG C for 2-24h, an alkali liquid is added into the reaction product and undergoes a reaction, the reaction solution is separated and the precipitates are subjected to dewatering and drying so that the fluorine-containing phosphate surfactant is obtained. The preparation method has simple processes. The fluorine-containing phosphate surfactant has excellent performances, a high reaction yield, low surface tension, high activity, good water and oil resistance, wettability, emulsibility and good environmental friendliness and can be used as an emulsifier and a wetting agent in an actual life.

Description

technical field [0001] The invention relates to the field of surfactants, in particular to a fluorine-containing phosphate surfactant and a preparation method thereof. Background technique [0002] Due to the special properties of "three highs and two phobias", fluorosurfactants have attracted more and more attention from people. They are currently the most active category of all surfactants. They are mainly used in special occasions with high technical requirements or in general In areas where surfactants are difficult to perform and have poor application effects, its fluorine-containing hydrocarbon group is both hydrophobic and oil-repellent [New Chemical Materials, 2004, 32(8): 46]. In the 21st century, fluorine-containing surfactants are gradually developing in the direction of environmental friendliness, high surfactant and low cost. The development of fluorine-containing surfactants abroad and in my country is mainly based on 8-carbon perfluorooctyls as raw materials ...

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Problems solved by technology

The branched fluorocarbon surfactant developed with hexafluoropropylene trimer as raw material is easy to degrade under various physical and chemical conditions, and has low bioaccumulation. It is an ideal substitute for PFOS / PFOA. Reported ethylene, tetrafluoroethylene, perfluoroalkyl iodide telomerization in US8049040 B2, and then through a series of reaction steps to prepare the technological process of ethylene-tetrafluoroethylene phosphate composition fluorocarbon anion surfactant, the surface activity of this patent obtained The surface performance of the agent is excellent, but the telomerization process of ethylene, tetrafluoroethylene, and perfluoroalkyl iodide is complex and the yield is low, resulting in high cost and difficult industrialization. Patent US20110092410A1 reports the preparation of perfluoroalkane with hexafluoropropylene dimer as raw material A new process for phosphate-based fluorocarbon anionic surfactants, but the process has too many reaction steps, complicated process, and expensive reagents such as cesium fluoride and propylene bromide are used, and the production cost is relatively high. Patent WO 9104978 (JP 3123786 A ) reported a preparation method of monophosphate fluorocarbon anion surfactant, but the raw material does not have ω-H fluorinated alkyl alcohol, the raw material is difficult to obtain, and the production cost is high

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