With around 1000 employees, two independent production facilities in Europe as well as offices in over 30 countries, Nynas is dedicated to researching, producing and supplying specialty naphthenic oils and bitumen for a growing global market. Together with our customers, we have the know-how to find new applications and meet new challenges that can help shape society.
Nynas is a key global supplier of highly refined, hydrotreated naphthenic base oils. These Naphthenic Specialty Products (NSP) are applied as base oils for industrial lubricants and lubricating greases, or as process oils for rubber and plastics (and many other uses).
The naphthenic base oils have many attractive properties for the formulation of industrial lubricants, and have found widespread application due to the following properties:
On average, Industrial Gear Oils account for almost 3% of the global lubricants market. Total global consumption is expected to reach well over 1 million tonnes by 2020, with Naphthenic oils poised to increase their market share in this application.
Industrial gear oils are generally formulated with 95-98% of base oil. The other 2-5% often consists of an industrial gear oil additive package. A traditional Industrial Gear oil in the VG range 150 to 460 is typically formulated from paraffinic Bright Stock and SN 500/600 in different proportions according to the needs of the different Viscosity Grades.
For the upper viscosity grades, ISO VG 680, 1000 and 1500, Viscosity Modifiers (VM) like PIB, or Viscosity Index Improvers (VII:s) are employed to create viscosities above what can be reached using typical paraffinic Bright Stock (KV at 40 °C ca 500 cSt)
Naphthenic base oils for industrial lubricants offer benefits with regards to high additive solvency and low temperature properties. Naphthenic base oils do not, however, on their own have the required Viscosity Index (VI) required in the common ISO VG grades for many industrial lubricants. In, for example, Industrial Gear Oil standards such as ISO 12925-1 and DIN 51517-3, a minimum viscosity index of 90 or 85 is required.
Therefore, to be able to formulate gear oils based on NYNAS® Naphthenic specialty base oils, we have created a set of model base fluids meeting these Kinematic Viscosity (KV) and Viscosity Index (VI) requirements. We have shown that all ISO VG classes relevant for industrial gear oils indeed can be formulated from NYNAS® T 110, BT 150, T 400 and T 600 with the addition of Viscosity Index Improvers (VII), Viscosity Modifiers (VM) or high VI base fluids.
We managed to meet KV and VI requirements for seven ISO VG classes: 150, 220, 320, 460, 680, 1000 and 1500 in least one of the model base fluid formulations in each ISO VG class.
Five (5) different commercially available viscosity modifiers were successfully employed, Table 1. The required content of VII, VM or high VI base fluid needed in each model formulation varied from 7% to 43%, and the average treat rate level was around 10-15%.
Please see Table 2 for more examples
We thus can propose starting formulations for industrial gear oils, and other industrial lubricant and greases needing high base oil viscosity. A wide viscosity range, 150 to 1500 cSt, utilizing four different high viscosity NYNAS® Naphthenic base oils and five different VI Improvers representing different chemical compositions, have been made. We are now ready to share these results with formulator eager to explore the span of opportunities offered by NYNAS® Naphthenic base oils in industrial lubricant applications.
– Thomas Norrby
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