Method for testing soot-related viscosity increase

Details Method for testing soot-related viscosity increase Method for testing soot-related viscosity increase

1994-04-28

1996-11-05

Brock, Michael

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Lubricant testing

73 6141, G01N 3328

Patent

active

055719503

ABSTRACT:
A method for testing a sample for soot-related viscosity increase comprising: (a) preparing the sample which comprises a major amount of an oil of lubricating viscosity, (b) measuring the viscosity of the sample (c) preparing a stable sample/paste dispersion of the sample and a carbon black paste, (d) equilibrating the sample/paste dispersion, and (e) measuring the viscosity of the sample/paste dispersion, and a method for predicting physical effects of soot-loading on a sample in a test which measures viscosity increase comprising: (1) measuring viscosity increase for a series of reference fluids in the test, (2) measuring viscosity increase for the series of reference fluids in a method having steps (a) to (e), (3) developing a curve, (4) evaluating the sample using the method having steps (a) to (e), and (5) interpolating a viscometric effect for the sample using the curve.

REFERENCES:
patent: 4794787 (1989-01-01), Gordon
patent: 4873004 (1989-10-01), Beverwijk
patent: 5089158 (1992-02-01), Van Kruchten
"Kinetic Approach to Engine Oil. 3. Increase in Viscosity of Diesel Oil Caused by Soot Contamination"; Ing. Eng. Chem. Prod. Res. Dev., vol. 20, No. 3, 1981, pp. 540-544 (S. Yasutomi).
"Mechanisms and Control of Viscosity Increase in Railroad Diesel Engine Lubricants"; Lubricating Engineering, vol. 42, No. 6, Jun. 1986, pp. 350-356 (M. R. Logan).
"Some Aspects of Tribological Behavior on Dispersed-phase System"; Lubricating Engineering, vol. 44, No. 11, Nov. 1988, pp. 913-921 (K. Yoshida).
PCT Search Report (Sep. 14, 1995).

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