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Compositionally Driven Viscometric Behaviors of Poly (Alkyl Methacrylates) in lubricating oils

Advances in Chemical Engineering and Science 2022年第2期12卷 65-86页

作者： Reid A. Patterson Christopher P. Kabb David M. Nickerson Eugene Pashkovski Research and Development The Lubrizol Corporation Wickliffe USA

Viscosity index (VI) and shear stability index (SSI) are standard methods used in the lubricant industry to determine temperature-viscosity dependency and resistance to product degradation, respectively. A variety of oil-soluble polymers, including poly(alkyl methacrylates) (PAMAs) are routinely used to control these properties in fully-formulated liquid lubricants. In this report, we use reversible addition-fragmentation chain transfer (RAFT) polymerization to precisely target identical degrees of polymerization in a family of PAMAs with varying lauryl, hexyl, butyl, ethyl, and methyl groups. Then, expanding on previous methodology reported in the literature, we establish structure property relationships for these PAMAs, specifically looking at how intrinsic viscosity [η] and Martin interaction parameters KM relate to VI and SSI characteristics. While the intrinsic viscosity [η] is associated with the volume of macromolecules at infinite dilution, the parameter KM reflects the hydrodynamic interactions of polymer chains at actual polymer concentrations in lubricating oils. In this paper, we show that the dependence of VI on the non-dimensional concentration c/c* (or c[η]) can be presented in a form of master curve with shift factors proportional to KM that decreases with increasing size of alkyl groups. This finding implies that even in the dilute regime, the coil-expansion theory used to explain the effect of macromolecules on VI should be complemented with the idea of hydrodynamic interactions between polymer molecules that can be controlled by the choice of alkyl chains in the family of PAMAs.

关键词： Viscosity Index Shear Stability Index Polymethacrylates lubricating oils

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A Generalized Correlation for Characterization of lubricating Base-oils from Their Viscosities

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Chinese Journal of Chemical Engineering 2010年第4期18卷 642-647页

作者： A.H.Mehrkesh S.Hajimirzaee M.S.Hatamipour Islamic Azad University Majlesi BranchIsfahanIran Gas Processing & Transmission Engineering Department Petroleum University of TechnologyAhwazIran Chemical Engineering Department University of IsfahanIsfahanIran

lubricating mineral base oils are normally extracted from lube-oil cuts with furfural *** content in the raffinate phase from extraction process is an essential parameter that affects the quality of the lubricating *** determination of aromatic content by the usual ASTM D3238 method,density,refractive index and molecular weight of the raffinate are *** this work,a new generalized correlation is developed for de-termination the aromatic content by using only the measured viscosity of lubricating *** a mole fraction of aromatic compounds,the kinematic viscosity may be obtained at any temperature between 60-100°C along with their molecular weight and refractive index.

关键词： lubricating oils aromatic content kinematic viscosity molecular weight refractive index

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Laboratory Assessment of Lubricants for Wheel/Rail Lubrication

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Journal of Materials Science & Technology 1997年第1期13卷 57-60页

作者： Zhao, XZ Liu, JJ Zhu, BL Wang, CY ZHENGZHOU RES INST MECH ENGN ZHENGZHOU 450052PEOPLES R CHINA

The antiwear properties of two wheel/rail lubricating oils were tested and compared on an Amsler machine. Under same testing conditions, oil A (developed by authors) showed much better wear resistance and higher load-carrying capacity than oil B (imported from abroad). The X-ray diffraction (XRD) analyses of the worn surfaces showed that different extreme pressure (EP) lubricating films were formed on the surfaces when the rollers were lubricated with different oils under boundary lubrication condition. The EP film of oil A was a composite film containing three compounds, FeO, FeSx and FeP, while oil B formed only a simple EP film of FePO4. The composite EP film showed lower shear strength and better antiwear property than the simple EP film, which brought about different wear resistance df the two wheel/rail lubricating oils.

关键词： lubricating oils

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New Progress in Design and EngineeringDevelopment of Hydrogenation Units3 - Engineering Development and Commercial Application of Lube Oil Hydrogenation Technology

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China Petroleum Processing & Petrochemical Technology 2000年第4期2卷 23-27页

作者： Liu Jiaming SINOPEC Beijing Design Institute China

　　1 Introduction　　 With the automotive industry embarking on the development route toward high speed, energy conservation,low fuel consumption, low emissions and extended oil condemning limits in the 1990s, better quality lubricant products are needed. The previous approach for improving the performance of lubricant products through adjustment of additive composition can no more meet the demand. Higher requirements for the quality of lube base stocks are raised. These requirements are:(1) higher oxidation stability; (2) better viscosity temperature performance; (3) better low temperature flow property; and (4) excellent shearing stability and antiwear property. In the meantime, the development of industrial technology and stricter environmental and safety requirements have raised their demand for highquality industrial lubricating oils. The quality of mineral lubricating oils made by traditional means of lube technology has been reaching its limits without room for further improvement. In addition the crude oil resources that are suitable for making lube oils are depleting. The lube oil production is forced to opt for the inferior heavy crude, posing a difficult dilemma for the traditional petroleum processing industry.……

关键词： Lube Oil lubricating oils oxidation stability automotive industry fuel consumption low temperature oil production high speed crude oil

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高性能润滑油的分子科学与工程应用

高性能润滑油的分子科学与工程应用

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2015年第十四届全国应用化学年会

作者：刘维民中国科学院兰州化学物理研究所

本文简述了润滑的发展历程,指出人类先后经历了使用动物脂肪、植物油、矿物基润滑油、合成润滑油、固体润滑等作为润滑材料的历史进程。重点介绍了合成酯类润滑油、航天航空用合成润滑油、离子液体润滑剂的设计制备方法及其性能特点,认... 详细信息

本文简述了润滑的发展历程,指出人类先后经历了使用动物脂肪、植物油、矿物基润滑油、合成润滑油、固体润滑等作为润滑材料的历史进程。重点介绍了合成酯类润滑油、航天航空用合成润滑油、离子液体润滑剂的设计制备方法及其性能特点,认为合成润滑油可按特殊的环境

关键词： lubricating oils synthetic lubricants molecular design engineering application

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