Síntese e caracterização de tensoativo não iônico derivado do ácido ricinoleico: uma aplicação cosmética

• Autor(a) principal: Cruz, Francisco Jarbas Bezerra da
• Data de Publicação: 2021
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• dARK ID: ark:/83112/001300000nk4b
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/62550
• topic: Aminólise direta; Óleo de mamona; Ácido ricinoleico; Cocamide DEA; Cosmetologia

Coconut fatty acid diethanolamide is a nonionic surfactant derived from coconut oil that compounds various cosmetic and sanitizing formulations (2 to 8%) in order to stabilize foam, and, when combined with sulfated anionic surfactants, increase the viscosity of the system. In addition, it has an overgreasing effect on the skin and helps in the solubilization of essences. This product is obtained from coconut oil. Castor oil is one of the cheapest and most abundant materials, with excellent biodegradability, and is therefore a biomass that is widely used for the development of new products. Thus, this work aims to synthesize and characterize a diethanolamide from castor oil and ricinoleic acid, defining the optimal reaction conditions, and to investigate its potential as a secondary surfactant in cosmetic formulations under the aspects already mentioned. Initially, diethanolamide was produced in a batch system under reflux and heating for both starting materials, verifying the reaction progress by thin-layer chromatography. Then, the sample of diethanolamide obtained from castor oil was purified using chromatographic column containing silica gel as adsorbent, and solutions of hexane, ethyl acetate and ethanol in different proportions as eluent. Then, Fourier transform infrared spectroscopy (FTIR) analyses were performed to characterize the molecule. Finally, a liquid soap formulation was prepared using the produced diethanolamide to evaluate the viscosity and foam stability. In addition, essence solubility tests were performed. The results were acceptable reaching a yield of 72% and a conversion of 79.6%, for the reaction with oil and for the reaction with acid, respectively. The liquid soap sample formulated with ricinoleic acid diethanolamide and thickened with sodium chloride showed a maximum viscosity value of 254.09 cP. In foam stability, the surfactant performed satisfactorily even though it was not pure. The surfactant was able to produce stable emulsions with three of the five essences tested.