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

Lubricants

Rajendra Badoni¹  Eltepu Sayanna²  Ravi Dixena² 

[1] College of Engineering Studies, University of Petroleum and Energy Studies, DehradunPIN-248007, India;Indian Oil Corporation Limited, R&D Centre, Sector-13, Faridabad PIN-121007, Haryana, India;

关键词: lubricating grease;    rheology;    polypropylene;    high density polyethylene;    oil separation;    heat stability;   

DOI  :  10.3390/lubricants2040237

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown