Alves, Salete MartinsSantos, Hugo Vinicius Silva dos2023-04-122023-04-122022-12-08SANTOS, Hugo Vinicius Silva dos. Desenvolvimento e caracterização físico-química de aditivados com líquidos iônicos. Orientadora: Salete Martins Alves. 2022. 10 f. Trabalho de Conclusão de Curso (Graduação em Engenharia Mecânica) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2022.https://repositorio.ufrn.br/handle/123456789/52106The study on ionic liquids has a great importance in the development of lubricants, because they improve thermal stability, improve tribofilm formation, promote lower waste emissions, etc., when used as lubricants or additives for lubricants. This article aims to evaluate the addition of ionic liquids to lubricating oils and their influence on physical and chemical characteristics. To understand the changes in these characteristics, we studied a base oil (epoxidized soybean oil), and mixtures of two ionic liquids, Chloride of 1-Ethyl-3-Methylimidazolium [EMIC] and Octil Sulfide of 1-Butyl-3-Methylimidalium [BMIM OSU], in different percentages by weight (0.5, 1.0 and 1.5% p/p%). The properties investigated were viscosity, thermal conductivity, chemical characterization (determined in FT-IR spectroscopy), wetability (through the contact angle of the ionic liquid with a sae 1045 steel surface) and acidity (pH measurement). With this information, you can have a primary direction for the application in the manufacturing industry. The main hypothesis of the study is an improvement in the properties related to the performance of lubricants according to the increase in the concentration of ionic liquids in the base oil. The results showed that lubricants with ionic liquids are an efficient alternative for the industry, because for the proportions of the two additives studied, there was little variation in their thermal and rheological characteristics, maintaining the good characteristics of the base lubricant. Analysis of FT-IR spectra also revealed a more stable product. On the other hand, the acidity presented a more acidic characteristic, which disfavors its primary applicability. However, there was an increase in steel wettability with the increase in the proportion of ionic liquids, with the base oil presenting an average contact angle of 30.56º, while the EMIC showed values that started from 29.37º and reaching 28.86º, and the BMIM obtained values that went from 29.75 to 28.88º for concentrations that went from 0.5 to 1.5% (w/p%) in oil, which favors the lubrication process in metal contacts.Attribution-NonCommercial-ShareAlike 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-sa/3.0/br/Líquidos iônicosEficiênciaLubrificantesPropriedadesIndústria de petróleoIonic liquidsEfficiencyLubricantsPropertiesOil industrybachelorThesisCNPQ::ENGENHARIAS