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Recycled and Virgin HDPEs as Bleed Inhibitors and Their Rheological Influences on Lubricating Greases Thickened with PP and mPP

1
Indian Oil Corporation Limited, R&D Centre, Sector-13, Faridabad PIN-121007, Haryana, India
2
College of Engineering Studies, University of Petroleum and Energy Studies, Dehradun PIN-248007, India
*
Author to whom correspondence should be addressed.
Lubricants 2014, 2(4), 237-248; https://doi.org/10.3390/lubricants2040237
Received: 7 August 2014 / Revised: 18 September 2014 / Accepted: 24 September 2014 / Published: 18 December 2014
(This article belongs to the Special Issue Lubricating Greases)
Polypropylene (PP) thickened lubricating grease exhibits high oil bleed tendency at low temperatures, which makes it a promising candidate for low temperature applications. At elevated temperatures, PP thickened lubricating grease exhibits excessive oil bleeding, which limits its use at high temperatures. Excessive oil bleed adversely affects the lubricating performance of the PP thickened grease. The present work is focused on the study of the oil bleed tendency of PP and Maleated Polypropylene (mPP) thickened greases at various temperatures by incorporating virgin and recycled high density polyethylene (HDPE) into the thickener system. Grease containing various percentages of PP and mPP thickeners were prepared and modified with different percentages of virgin and recycled HDPE. Polymers were characterized through differential scanning calorimetry (DSC) techniques. The oil bleed performance of these greases was evaluated by the conical sieve method (ASTM D 6184) at various temperatures. Storage (G′) and loss modulus (G″) of greases was determined by rheometry at 25 °C. Incorporation of HDPE and recycled HDPE in PP thickened grease decreased oil bleeding compared to the base grease. View Full-Text
Keywords: lubricating grease; rheology; polypropylene; high density polyethylene; oil separation; heat stability lubricating grease; rheology; polypropylene; high density polyethylene; oil separation; heat stability
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Dixena, R.; Sayanna, E.; Badoni, R. Recycled and Virgin HDPEs as Bleed Inhibitors and Their Rheological Influences on Lubricating Greases Thickened with PP and mPP. Lubricants 2014, 2, 237-248.

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