Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE The L-37 automotive test5 is used to evaluate the load-carrying,
wear protection and extreme-pressure proper-ties of gear lubricants in final hypoid drive axles. The severity of the test was increased to challenge Elevance Aria™ WTP 40 to the absolute limits in gear lube performance. Test conditions were low-speed, high-torque for 24 hours at 135o
C. Elevance Aria™ WTP 40 was
formulated similar to prior testing (vide supra). The L-37 wear test results in Table 2 indicate strong pass.
No.103 page 4
designed interaction with the metal surface. We’re seeing that the formulation flexibility with Elevance Aria™ WTP 40 allows these additives to perform at their most optimal level.
Figure 9. L-60-1 automotive gear oil test The L-60-1 automotive gear oil test6
measures an oil’s resistance Table 2. L37 Automotive drive axle test
to thermal/oxidative degradation under high temperature conditions. In addition to the evaluation of the gear components (see photos in Figure 9), the L-60-1 test evaluated the viscosity change and sludge generated of the used oil. The Elevance Aria™ WTP 40 formulation passed all of the GL-5 specifications while it also outperformed the PAO/ester formulation in varnish measurement.
Figure 8.
6. Conclusions Elevance renewable building blocks offer a new tool for synthesising novel, high-performance lubricant base stocks. Elevance Aria™ WTP 40 is a base stock that can help meet today’s high-performance base stock demands for severe applications. The molecular design of Elevance Aria™ with chemically bound ester shows advantages over the PAO/ester blend in additive compatibility, seal compatibility, foam control, friction, wear, cleanliness and tribological performance. The improved performance of Elevance Aria™ WTP 40 could be attributed to its stronger and thicker adsorbed fluid film and intramolecular interactions. Elevance Aria™ WTP 40 is showing great promise and more formulating and testing will help demonstrate the ideal applications.
References [1] [2]
In automotive differentials the ring and pinion are spiral-cut, hypoid gears. They slide more on each other than other types of gears. Extreme-pressure additives are used to protect these gears when the lubricant film is wiped away or ruptured. The photos in Figure 8 complement the data showing very little wear, pitting and scoring and no corrosion or deposition. These results demonstrate that the inherent polarity of Elevance Aria™ WTP 40 allows for additive solvency without disrupting the additive
[3] [4] [5] [6]
http://www.nobelprize.org/nobel_prizes/chemistry /laureates/2005/
press.html
http://www.chemicalstechnology.com/news/ newswilmar--elevance-jv- commissions-indonesian-biorefinery
Kline Global Lubricant Basestocks Report 2011 DIN 51350-6
http://www.astm.org/Standards/D6121.htm http://www.astm.org/Standards/D5704.htm
LINK
www.elevance.com
LUBE MAGAZINE NO.132 APRIL 2016 39
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