Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
NYCOBASE 9600X appears to be an interesting candidate for the purpose of the study, as it demonstrates:
• A very low volatility, which translates into little evaporation in operation
• An outstanding resistance to oxidation, resulting in a low tendency to polymerize
• A low coking propensity, which means that the oil will eventually burn – cleanly.
In a second step, NYCO utilized its expertise in the formulation of last generation, high temperature jet engine oils to design a specific antioxidant system showing excellent response in neopolyol esters. This technology provides superior protection against thermo-oxidative degradation.
Comparison between this technology (NYCOPERF AO 337) and traditional combinations of aminic anti-oxidants (dioctyl diphenylamine, octylated phenyl alpha-naphthylamine, for instance) clearly demonstrates superior performance of NYCO’s technology, as shown in aluminium pan evaporation test results at 200°C on 2 formulated esters, and on micro-coking test results (Figure 3).
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The expected phenomena taking place on severely heated oils are: • Evaporation, resulting in mass loss
• Thermal decomposition, resulting in lighter, volatile compounds and mass loss
• Oxidation, resulting in a variety of oxygen containing products
• Polymerization of degradation products, resulting in deposit and varnish
True evaporation is most probably a negligible phenomenon compared to thermo-oxidative mechanisms. It is noticeable that NYCOBASE 9600X, because of its chemical nature, seems to have an inherenty low coking propensity.
Antioxidants, through their inhibiting action on thermal decomposition and oxidation, seem to delay the induction time, when rapid decomposition starts increasing exponentially. They probably do not change the way the product degrades. This seems to be confirmed by the general profile of the evaporation curves that remains unchanged whatever the type of anti-oxidant.
In order to obtain the best possible base fluid for the formulation of high temperature greases and maximize thermo-oxidative properties, we quite naturally chose to combine highly thermally stable ester NYCOBASE 9600X with NYCO’s high performance anti-oxidant system NYCOPERF AO 337.
Oxidation tests confirm such a combination leads to outstanding results in terms of resistance to thermo-oxidative degradation and coking propensity (Figure 4, Table 4: thermal stability of formulated fluid). Such properties are taken advantage of in applications like high temperature chain oils for instance, where temperatures sometimes as high as 300°C can be met. This technology is patented as a high performance anti-oxidant system in high temperature chain oils (1).
Figure 3. Pan test, evaporation graphs, 200°C.
Micro-coking test, 230-280°C, Comparison of AO systems - Formulated oils.
Figure 4. Pan test at 230°C and thermogravimety of NYCOBASE 9600X with NYCOPERF AO337.
LUBE MAGAZINE NO.123 OCTOBER 2014 31
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