SYNTHESIS AND STUDY OF THE PROPERTIES OF A NONIONOGENIC SURFACTANT BASED ON FATTY ACIDS OF CORN OIL AND DIETHANOLAMINE
Abstract
A new product has been obtained with the use of diethanolamine and corn oil fatty acids. The series of experiments have been performed to learn its composition, physico-chemical and colloid-chemical properties with the use of modern devices and methods. The results of IR-spectroscopy have approved the presence of specific functuonal groups: carboxilic, hydroxilic, and ester groups. The results of the experiments have shown that the synthesized substance posesses the surfactant properties and emulsifying ability, belongs to the group of high-dispersity and mono-dispersity systems. The particle size before reaching the critical point of micelle formation is 154.5 nm, at the CMC point - 294.7 nm, and after - 346.5 nm. Measuring the values of surface tension by the Du Nouy method allowed defining the critical concentration of micelle formation (0.25-0.5 g/dm3), at which the maximum wetting is achieved. It was shown that the contact angle of wetting of the water solution of a substance is less than 90° on a hydrophilic (gelatinous) surface. It was found that the synthesized diethanolamide is characterized by high resistance to aggregation, since the obtained values of the zeta potential below ± 10 mV were not observed. It was established that the synthesized product has an emulsifying ability in comparison with industrial oil. Besides, the highest stability of the emulsion is observed at a product concentration of 2.0 g/dm3. The developed substance belongs to non-ionic surfactants, the pH of the water solution is 6-7, it dissolves well in various organic solvents (toluene, hexane, xylene, dimethylformamide, acetone, white spirit, ethyl and isopropyl alcohols), and is slightly soluble in water. According to the calculations of the hydrophilic-lipophilic balance, it belongs to the oil-in-water emulsifiers.
For citation:
Lutfullina G.G., Fatkhutdinova A.A. Synthesis and study of the properties of a nonionogenic surfactant based on fatty acids of corn oil and diethanolamine. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2022. V. 65. N 11. P. 20-26. DOI: 10.6060/ivkkt.20226511.6640.
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