摘要:

AbstractAs lubricant classification of different types of two‐stroke oil moves towards realisation, the need has emerged for environmentally friendly two‐stroke lubricants suitable for different operating conditions and applications. In this paper the authors report results on ester‐based synthetic lubricants according to various test regimes, and show the superiority of synthetics in these tests. Outboard and chainsaw 2T lubricants are disc

ISSN:0265-6582    

DOI:10.1002/jsl.3000080202

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractVarious workers have developed different viscosity ‐temperature relationships for fluids for many years. These relationships are suitable for a narrow temperature range, but they are unsuitable over the wide temperature ranges of synthetic lubricants. This paper describes a modified ASTM 0341 viscosity‐temperature relationship developed by a least‐squares treatment of large amount of available experimental viscosity data for synthetic lubricants. The modified relationship reads:\documentclass{article}\pagestyle{empty}\begin{document}$$ ln(ln(Z)) = A + B\,ln\,\,(T) + C/T \\ Z = v + 0.7\,\,\,\,\,\,\,\,\,\,\,\,\,(v > 2\,mm^2 /s) \\ Z = v + 0.7 + exp\,(- 1.47 - 1.84*v - 0.51*v^2)(v = 2\,or\,v < 2mm^2 /s) \\ $$\end{document}.The relationship can adequately describe viscosity‐temperature characteristics of synthetic lubricants over a wide temperature range. The relationship was examined for various synthetic lubricants. It was found capable of correlating the available experimental viscosity data with an average absolute error of less than 2% between calculated values and experimentally determined values over the temperature ranges studied for 14 synthetic lub

ISSN:0265-6582    

DOI:10.1002/jsl.3000080203

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractThe production of polyalphaolefins (PAOs), an important class of synthetic functional fluids, can be better controlled to form materials with given sets of desired properties than can the production of analogous petroleum based fluids. Until now, commercial PAOs have been based almost exclusively on 1‐decene as the starting material. Furthermore, they have been sold on the basis of the viscosity at 100 °C. Work at the authors' company has shown the need to focus attention on other physical properties for various alternative applications. Important properties may or may not include low temperature viscosity, pour point, volatility, high temperature stability, flash and fire point, and oxidative stability. The current work shows how the physical properties of the PAO product can be controlled by the judicious choice of starting olefin, reaction catalyst and co‐catalyst, reaction temperature, reaction time, and other pertinent reaction parameters. Comparisons are made between PAOs and hydrocracked mineral

ISSN:0265-6582    

DOI:10.1002/jsl.3000080204

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractA lubricating fluid's flow characteristics are affected by fluid deformation resulting from the action of mechanical forces: flow resistance, dissipation of mechanical energy, transfer and dampening of mechanical disturbances. These in turn affect the lubricating ability of the fluid through energy absorption, power transfer and other properties. Synthetic fluids can display various thixotropic characteristics and non‐Newtonian effects. In this paper, experimental work on these phenomena are reporte

ISSN:0265-6582    

DOI:10.1002/jsl.3000080205

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000080206

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000080207

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000080208

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000080201

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY