Viscometric Characteristics of Viscosity Index Improvers - Structural Changes in PAO Solutions at Low Temperature 2001-01-1994
The evaluation of the effect of a Viscosity Index Improver (VII) in a mineral oil formulation at low temperatures becomes difficult when wax crystallization occurs, which modifies the oil viscosity-temperature behavior.
In this work, we studied the isolated influence of VII's in rheological characteristics of lubricants, using polyalphaolefin (PAO-4) as a wax free base oil. Brookfield viscosity results of the pure PAO-4 were compared to those of the VII solutions, in four concentrations, from -10°C to -40°C.
The VII thickening power was determined for two commercial polymers from their reduced and intrinsic viscosities in PAO-4 solutions. These parameters were then used to analyze the low temperature behavior of formulated ATF's with two kinds of base oils, one Group II and one Group III. The studied VII's are available in Brazil for the formulation of ATF fluids.
Citation: Pereira, N., Araújo, M., and Habert, A., "Viscometric Characteristics of Viscosity Index Improvers - Structural Changes in PAO Solutions at Low Temperature," SAE Technical Paper 2001-01-1994, 2001, https://doi.org/10.4271/2001-01-1994. Download Citation
Author(s):
Noely Francisca Pereira, Maria Adelina Santos Araújo, Alberto Cláudio Habert
Affiliated:
PETROBRAS Research and Development Center, Universidade Federal do Rio de Janeiro
Pages: 9
Event:
International Spring Fuels & Lubricants Meeting
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Lubricants
Polymers
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