Study On The Synthesis And Performance Of Fatty Alcohol Polyoxyethylene Ether Carboxylate

Fatty alcohol polyoxyethylene ether carboxylate?AEC?is a multifunctional green surfactant with the properties of vnon-ionic and anionic surfactants.It has good compatibility,can be mixed with other types of surfactants,has strong anti-ashing ability,etc.,and has good application prospects.Domestic research on this type of surfactant started late,with fewer species and yields.Therefore,it is of great significance to reduce the cost and synthesize high-yield alcohol ether carboxylates.In this paper,three high-yield fatty alcohol ether carboxylate surfactants(by using carboxymethylation method,fatty alcohol polyoxyethylene ether(AEO_n=3,9),sodium hydroxide,and sodium chloroacetate)were synthesized.AEC₉Na,AEC₃Na).The best process conditions are n?AEO₉?:n?Na OH?:n?Cl CH₂COONa?=1:0.9:1.5;alkaline reaction time is 2h for primary AEO₉,1.5h for secondary AEO₉,and 4h for carboxymethylation;reaction temperature is 110?,90?,percent conversion can reach 93.7%of secondary AEO₉ and 88.7%of primary AEO₉;n?AEO₃?:n?Na OH?:n?Cl CH₂COONa?=1:1.1:1.3,the reaction temperature is 160°C for alkalization,80°C for carboxymethylation,and reaction time For 3h and 4h,the anion content of the product can reach 88.93%after separation and purification.The infrared spectrum?FTIR?and nuclear magnetic spectrum?¹HNMR?of AEC₃Na and AEC₉Na confirmed the formation of the target products AEC₃Na and AEC₉Na.This paper also evaluates the physical and chemical properties and application properties of the produced target products AEC₃Na and AEC₉Na.The experimental results show that the minimum surface tension in hard water is 24.42 m N·m^-1.At the same concentration in soft water,AEC₃Na has a lower surface tension.When the mass fraction is 1%,the minimum surface tension of the AEC₃Na solution is 21.3 m N·m^-1,which is lower than the surface tension of commercial AEC₉Na,and has better wettability and foam stability.The average wetting time is 2.64s;in soft water,when the mass fraction of AEC₉Na is 1.2%,the surface tension of the primary AEC₉Na is24.2 m N·m^-1,the secondary AEC₉Na is 23.9 m N·m^-1,and the foaming properties of the primary AEC₉Na become better,the foam is the most stable,and the commercial AEC₉Na has poor foam stability.The primary AEC₉Na has the smallest average particle size,more uniform particles and better stability.In addition,AECNa has good dispersibility and antistatic property,which can significantly improve the dispersibility of chopped high-strength and high-density vinylon fibers in water;simultaneously,primary AEC₉Na,secondary AEC₉Na and AEC₃Na can reduce the specific resistance of polyester staple fibers to 6.5×10⁶?·cm?3.8×10⁶?·cm and1.2×10⁶?·cm respectively,suggesting the production has the potential to be widely employed as an anionic surfactant.