Estudo do desempenho tribológico em sistemas de emulsão/microemulsão para aplicação em fluidos de corte
Development of new cut fluids constitutes an important field of scientific and technological activity, since most of the fluids are part of the consumption of petroleum source, which is limited and not renewable. Recently, emulsion systems have been studied as an alternative to improve tribologic...
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| Format: | doctoralThesis |
| Idioma: | pt_BR |
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Brasil
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| Accés en línia: | https://repositorio.ufrn.br/jspui/handle/123456789/27368 |
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| Sumari: | Development of new cut fluids constitutes an important field of scientific and technological
activity, since most of the fluids are part of the consumption of petroleum source, which is
limited and not renewable. Recently, emulsion systems have been studied as an alternative
to improve tribological applications as lubricant fluids. Thus, this work aimed to formulate,
characterize and study the tribological performance for O/A emulsions and A/O
microemulsion systems with different anionic surfactants (soap base) and non-ionic
nonylphenol polyethoxylates with different degrees of ethoxylation to apply as cutting
fluids. Epoxidized vegetable oil was use for the development of emulsion and
microemulsion systems. The main physico-chemical properties were determined for the
formulations, such as density, acidity, iodo index, oxirane index, small angle X-ray
scattering analysis (SAXS), particle size, rheological measurements and contact angle. In
order to evaluate the tribological performance of the systems, a High Frequency
Reciprocating Rig (HFRR) tribromometer, consisting of a plane type ball wear test. There
are none, it can be concluded that the physicochemical properties analyzed are suitable for
the fluid as lubricants. The lower concentration of anionic surfactant (1%) presented lower
Friction coeficients for the studied emulsions. The emulsions developed with 5% surfactant
showed higher Friction coeficients and wear rate. The microemulsion systems have
cylindrical shapes, in which it contributes to higher viscosity in the systems. When
comparing the Friction coeficients in systems formulated with different surfactants NP4EO,
NP6EO and NP9.5EO, it was observe that the Friction coeficients tends to increase in the
systems (M1-M3) as the degree of ethoxylation increased along with the increase of
sufactant concentration. |
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