Thermoanalytical and rheological characterization of automotive mineral lubricants after thermal degradation

Santos, José Carlos Oliveira; Santos, I. M. G.; Souza, A. G.; Sobrinho, Eledir V.; Fernandes, Valter J.; Silva, Arilson José N.

doi:10.1016/j.fuel.2004.06.016

Cited by 66 publications

(44 citation statements)

References 12 publications

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“…FT-IR and NMR spectroscopy have already been used to identify the oxidation products and to investigate the oxidation kinetics [46,[49][50][51][52][53][54]. The appearance of two broad absorption bands in the 1850-1685 cm -1 and in the 1300-850 cm -1 regions of the FT-IR spectrum, corresponding, respectively, to the stretching vibration of the C=O and C-O bonds, has been used to follow the oil-aging process [46,50,53].…”

Section: Oxidation Of the Base Oilmentioning

confidence: 99%

Reactivity of Triphenyl Phosphorothionate in Lubricant Oil Solution

2009

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Investigating the thermo-oxidative reactivity of anti-wear additives in lubricant oil solution at high temperature can significantly contribute to an understanding of the mechanism of thermal film and tribofilm formation on metal surfaces. In this study, the reactivity of triphenyl phosphorothionate (TPPT) in lubricant oil solution at high temperature (423 and 473 K) has been studied by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. The results show that the TPPT molecule was highly thermally stable and did not completely decompose in oil solution even upon heating at 423 K for 168 h and at 473 K for 72 h. The degradation of the TPPT molecule, which turned out to be a first-order reaction, started taking place after 6 h at both temperatures, leading to the breakage of the P=S bond with the formation of triphenyl phosphate. During these heating experiments, no oil-insoluble compounds were detected. The oxidation of the base oil as a result of the prolonged heating demonstrated that the TPPT molecule did not effectively act as oxidation inhibitor.

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Section: Oxidation Of the Base Oilmentioning

confidence: 99%

Reactivity of Triphenyl Phosphorothionate in Lubricant Oil Solution

2009

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“…The majority of today's lubricants-and certainly all of tomorrow's-will be required to operate in a wide range of conditions that demand performance otherwise not possible without viscosity index improvers. [3] Examples of viscosity index improvers include polyisobutylenes, polymethacrylates. When a high molecular weight compound (a polymer) is dissolved in a fluid, the viscosity of the fluid increases.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Evaluation of Some Terpolymers as Lube Oil Additives

Nasser

Ahmed

Kamal

2011

Journal of Dispersion Science and Technology

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“…The presence of -OH, C=O, C=C and other functional groups in the infrared spectra shows that the PAO lubricating oil was oxidized to decay under high temperature and generated olefins, alcohols, acids and other products [12][13][14][15]. But the infrared spectra can't descript the effects of antioxidants on the oil sample degradation quantitatively because of the little amount of products.…”

Section: Figure 1 Infrared Spectra Of Paos After Oxidation Testmentioning

confidence: 99%

Studies on Thermal Oxidation Stability of Aviation Lubricating Oils

Zong

Fei³

2017

MATEC Web Conf.

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Abstract.Simulating the operating condition of aviation engine via autoclave experiment of high temperature and pressure, we studied the physic-chemical property of poly-α-olefin base oil samples mixed with antioxidants of 2,6-di-tert-butyl-4-methylphenol and p,p'-diisooctyl diphenylamine at different temperature. The mechanism of degradation of PAO aviation lubricating oil was analyzed according to the oxidized products by modern analytical instruments. The results showed that the aviation lubricating oil produced a large number of low molecule compounds while increasing the temperature, and resulted in the viscosity decreasing and acid value increasing which indicated that the thermal oxidation of the oil sample underwent a radical process.

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Thermoanalytical and rheological characterization of automotive mineral lubricants after thermal degradation

Cited by 66 publications

References 12 publications

Reactivity of Triphenyl Phosphorothionate in Lubricant Oil Solution

Reactivity of Triphenyl Phosphorothionate in Lubricant Oil Solution

Preparation and Evaluation of Some Terpolymers as Lube Oil Additives

Studies on Thermal Oxidation Stability of Aviation Lubricating Oils

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