Synthesis And Properties Of Fatty Alcohol Ether Carboxylic Ester Surfactants

Acid and salt-type fatty alcohol ether carboxylic ester?AE_nCE-H and AE_nCE-Na,n=3,5,7,9?surfactants were successfully synthesized with a green and efficient method using fatty alcohol ether with different ethylene oxide?EO?numbers?AEO_n,n=3,5,7,9?,succinic anhydride and NaOH as raw materials.In this paper,molecular structure,physicochemical property,application property of AE_nCE-H and AE_nCE-Na?n=3,5,7,9?as well as compatibility property of AE_nCE-Na with cationic surfactants were investigated.The conclusions are as follows:?1?Study on the preparation and characterization of fatty alcohol ether carboxylic ester.Nonionic acid-type fatty alcohol ether carboxylic ester with different EO numbers?AE_nCE-H,n=3,5,7,9?were obtained by one-step method using AEO_n?n=3,5,7,9?and succinic anhydride as raw materials.On the one hand,the conversion rate of AEO_n was determined by the acid values before and after the reaction.And on the other hand,the structure of products also was verified by Fourier transform infrared?FT-IR?spectroscopy,Nuclear magnetic resonance?¹H-NMR?spectroscopy and Matrix-assisted laser desorption/ionization time of flight mass spectrometry?MALDI-TOF-MS?.Finally,nonionic acid-type products AE_nCE-H?n=3,5,7,9?with different EO numbers were neutralized to obtain the solution of salt-type anionic fatty alcohol ether carboxylic ester?AE_nCE-Na,n=3,5,7,9?with corresponding EO numbers.?2?Study on the physicochemical property of fatty alcohol ether carboxylic ester.The influences of structure-activity relationship including EO numbers,types of surfactants and solution concentration on the physicochemical property of fatty alcohol ether carboxylic ether were investigated by static surface tension,dynamic contact angle and dynamic surface tension.The results showed that among AE_nCE-H and AE_n CE-Na?n=3,5,7,9?,AE₇CE-H and AE₃CE-Na have the highest surface activity,respectively,as well as AE₅CE-H and AE₃CE-Na have the strongest wettability on the hydrophobic paraffin film,respectively.AE_nCE-Na have faster diffusion rate than AE_nCE-H with the same EO numbers.The adsorption energy of AE_nCE-H and AE_nCE-Na?n=3,5,7,9?are all low,which belong to mixed diffusion-kinetic adsorption.?3?Study on the application property of fatty alcohol ether carboxylic ester.The influences of EO numbers and types of surfactants on the application performances of fatty alcohol ether carboxylic ester were discussed through the characterization of wetting,emulsification,foam and detergency.The results showed that among AE_nCE-H and AE_nCE-Na?n=3,5,7,9?,AE₇CE-H and AE₃CE-Na have the best wettability and emulsification.AE_nCE-H?n=3,5,7,9?are low-foam surfactants,while AE_nCE-Na?n=3,5,7,9?have better foam performances.The cleanability of AE_nCE-Na is better than that of AE_nCE-H?n=3,5,7,9?with the same EO numbers.?4?Study on the compatibility property of salt-type fatty alcohol ether carboxylic ester.The mixed systems AE₉CE-Na/DEQ and AE₅CE-Na/CTAB composed of AE₉CE-Na and AE₅CE-Na with DEQ and CTAB respectively showed synergistic effect in terms of surface activity and application performance.In addition,the mixed system AE₉CE-Na/DEQ also exhibited various self-assembly behaviors.