Black is the new black

Black is the new black

“Any color, as long as it’s black.” Henry Ford’s famous words referred to the rationalization of early car production. Black paint quite simply dried the fastest. A century later, rationalization, this time at oil refineries worldwide, could again open the door for black – Nynas’ highly viscous base oil BBT 28.

In a comparative study, Nynas prepared several lithium- based greases based on base oil blends with different viscosities (235, 370 and 505 mm2/s) where the starting point was a solvent neutral (SN 500). Since the viscosity of SN 500 was around 90 mm2/s, various amounts of bright stock or BBT 28 were required in order to reach the final viscosities, before a battery of tests were conducted. Overall, BBT 28-based greases showcased some interesting behaviors, such as lower thickener content, good shear stability, good low-temperature flowability and superior water spray-off.

How would the greases behave in cold weather? Tests such as flow pressure or rheological measurements such as a temperature sweep program could give valuable information regarding the flowability of lubricating greases. Such test programs were applied to the greases down to –25 °C. The outcome revealed that paraffinic-based greases had a significantly higher elastic modulus at –25 °C than the paraffinic/naphthenic-based greases, due to the further wax crystallization of the bright stock. Notably, further study found that BBT 28 had an excellent thickening effect; in order to obtain a shear stable NLGI grade 2, less than 4 (wt%) of the lithium-based thickener was needed.  

Nynas™ BBT 28

■ Significant reduction in thickener content

■ Good shear stability

■ Very good water spray-off, probably due to BBT 28’s higher adhesivity

■ Similar wear scar as the bright stock-based greases

■ Cost-effective

■ Comes in the never-out-of-fashion colour black

1.6.2017
6119

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