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Method for testing soot dispersing performance of engine oil

A technology of dispersion performance and testing method, applied in the direction of material inspection products, etc., can solve the problems of affecting dispersion bench correlation, simulate oil dispersion performance, etc., and achieve the effect of saving money and manpower, short test period and low cost

Active Publication Date: 2016-06-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the particularity of the soot particle structure and the substances contained on the surface, it is difficult to use carbon black to simulate the behavior of real soot in oil, and the subsequent viscosity method is not suitable for measuring non-Newtonian fluids containing soot; the oxidation method is also based on Viscosity method, the oxidized oil also exhibits non-Newtonian fluid properties, which affects its correlation with the dispersion bench
Therefore, so far there is no very simple and effective method to simulate the dispersion performance of oil products

Method used

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  • Method for testing soot dispersing performance of engine oil
  • Method for testing soot dispersing performance of engine oil
  • Method for testing soot dispersing performance of engine oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for testing engine oil soot dispersion performance, comprising the following steps:

[0026] A. Separation of the oil product tested on the CumminsISM bench test in an ultracentrifuge, the centrifuge speed is 10000-150000rpm, the separation time is 5h, the upper liquid is removed, the soot particles at the bottom are taken out and stirred evenly, then added to the engine oil, and stirred Mix evenly to form the oil sample to be tested. The oil sample to be tested is stirred at a speed of 2000-20000rpm, and the stirring time is 1-60min, but not limited to this; the oil added during the separation of the oil in the ultracentrifuge The dosage of the dispersant is (mass percentage) 4%, but not limited thereto.

[0027] B. The oil sample to be tested is placed in a rotational rheometer, and the viscosity of the oil sample is measured over time under a fixed shear rate and a fixed temperature. figure 1 As shown, the shear rate of the rotational rheometer is 10-300s ...

Embodiment 2

[0035] Separation of the oil product in the DV4 bench test in the ultracentrifuge, the centrifuge speed is 10000rpm, the separation time is 10 hours, the upper liquid is removed, the bottom soot particles are taken out and stirred evenly, then added to the engine oil, the soot particles and the engine The ratio of the oil is 10:90, and then stirred at a speed of 10000 rpm for 20 minutes under a high-speed mixer, and the two are mixed evenly to form the oil sample E to be tested. The oil sample E in this example is a commercial fully formulated engine oil with a quality grade of CF-4.

[0036] Put the oil sample E in the rotational rheometer, set the shear rate of the rotational rheometer to 100s-1, and the temperature to 40°C. Under these conditions, test for 1000 seconds, and measure the power of the oil from time t0 to time t1200 Viscosity increase value, and calculate its slope size, see figure 2 .

[0037] Then take oil sample F and oil sample G. The difference from oil...

Embodiment 3

[0043] Separation of the oil product in the MackT-8E bench test in an ultracentrifuge, the centrifuge speed is 80000rpm, the separation time is 16h, the upper liquid is removed, the soot particles at the bottom are taken out and stirred evenly, and then added to the engine oil. The ratio of the engine oil was 30:70, and then stirred at a speed of 5000 rpm for 40 minutes under a high-speed mixer, and the two were mixed evenly to form the oil sample H to be tested. The oil sample H in this example is a commercial fully formulated engine oil with a quality grade of CJ-4.

[0044] Put the oil sample H in the rotational rheometer, set the shear rate of the rotational rheometer to 200s-1, and the temperature to 120°C. Under these conditions, test for 800 seconds, and measure the power of the oil from time t100 to time t700 Viscosity increases and calculates its slope.

[0045] Take oil sample I again, the difference from oil sample H is that this oil sample is a laboratory blending...

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Abstract

The invention discloses a method for testing the soot dispersing performance of engine oil. The method includes steps of A, manufacturing to-be-tested oil samples, to be more specific, adding soot particles into the engine oil, and stirring and uniformly mixing the soot particles and the engine oil to form the to-be-measured oil samples; B, testing the dispersing performance, to be more specific, arranging the to-be-measured oil samples in a rotational rheometer and measuring time-varying curves of the viscosity of the oil samples under the conditions of fixed shear rates and fixed temperatures; C, acquiring the dispersing performance, to be more specific, computing viscosity increase values and slope in a certain period of time and measuring the slope. The dispersing capacity of the engine oil is good if the slope is low.

Description

technical field [0001] The invention relates to a method for analyzing and evaluating the performance of lubricating oil, in particular to a simulation test method for engine oil dispersion performance. Background technique [0002] High-grade heavy-duty diesel engine oil requires good dispersing properties to ensure that a large number of soot particles mixed into the oil are evenly dispersed into the oil. In the American Petroleum Institute (API) specification, the evaluation bench of CH-4 and CI-4 is MackT-8E, and the dispersion bench of CJ-4 is MackT-11. One hundred hours of time and higher costs severely restrict oil product development and product evaluation. [0003] A simple and quick simulation test method for simulating the dispersion of soot is very important for the development of oil products. At present, the main methods for evaluating the dispersion performance of engine oil soot in China are: spot method, electron microscope method, particle size analyzer m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/30
Inventor 张润香刘功德
Owner PETROCHINA CO LTD
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