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Method for rapid assessing high-temperature oxidation resistance of lubricating grease

A high-temperature anti-oxidation and anti-oxidation performance technology, applied in the field of grease, can solve the problems of restricting the development and research of grease products, low test temperature, long test time, etc., and achieve rapid monitoring of service life, good accuracy, and simple operation Effect

Inactive Publication Date: 2013-02-20
中国人民解放军空军勤务学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since grease is used to lubricate bearings, gears and other operating parts of the engine, its quality needs to be evaluated through the specified engine program, but due to the high cost of bench test evaluation and the relatively long test time, the development and research of grease products is limited
At present, the method of evaluating the anti-oxidation performance of lubricating grease is relatively more using the evaluation method of simulated oxidation test, the most typical method is the rotating oxygen bomb test, but the test temperature is low (usually 100 ℃), and the high temperature of lubricating grease cannot be effectively measured. Anti-oxidation performance, and the test preparation is cumbersome and the test time is long (usually 100h); in addition, aberration scanning calorimetry (DSC), pressurized differential scanning calorimetry (PDSC) micro-oxidation test and dielectric spectrum technology, Although the high-temperature oxidation resistance of lubricating grease can be quickly measured, there is no test method involving the evaporation loss performance of lubricating grease, and the test results can only show the length of the oxidation induction period of lubricating grease, and there is a lack of effective analysis methods for the oxidation process. The extent to which the oxidation reaction proceeds during the oxidation process, changes in the composition of the grease and its additives are unknown
Moreover, these advanced instruments are expensive and require high maintenance costs

Method used

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  • Method for rapid assessing high-temperature oxidation resistance of lubricating grease
  • Method for rapid assessing high-temperature oxidation resistance of lubricating grease
  • Method for rapid assessing high-temperature oxidation resistance of lubricating grease

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Test conditions

[0028] The lubricating grease used in the test is self-prepared, in which sample component 1 is composed of lithium complex grease and 1.0% amine antioxidant; sample component 2 is composed of lithium complex grease, 1.5% amine antioxidant and 1.0% phenolic Antioxidant composition. The amount of test sample is 40mg, the low-carbon steel metal grease cup, the heating temperature is 220 ℃, no air is introduced, the oxidation time is 20min, 30min, 40min, 50min, 60min, 70min, the washing solvent is petroleum ether, analytically pure.

[0029] (2) Test results

[0030] Table 1 Oxidation performance test results of different grease components

[0031]

[0032]

[0033] From the evaporation loss results of sample component 1 and sample component 2 in Table 1, it can be seen that as the oxidation time increases, the evaporation loss of the grease gradually increases, and the oxidation degree of the grease continues to deepen. The evaporation loss ...

Embodiment 2

[0035] (1) Test conditions

[0036] The greases used in the test are commercially available calcium-based grease A, aluminum-based grease B, lithium-based grease C, and barium-based grease D. The amount of test sample is 20mg, the copper metal grease cup, the heating temperature is 180°C, and the air flow rate is 80mL·min -1 , the oxidation time is 40min, 50min, 60min. The washing solvent is isopropanol, analytically pure.

[0037] (2) Test results

[0038] Table 3 Oxidation performance test results of different soap base greases

[0039]

[0040] It can be seen from the measurement results of the oxidation properties of the four soap-based greases in Table 2 that in the inventive method, there is a good correlation between the evaporation loss value of each grease sample and its oxidation induction time at the same oxidation time It fully shows that the anti-oxidation behavior of lubricating grease is very related to the numerical value of the two indexes. By comparin...

Embodiment 3

[0042] (1) Test conditions

[0043] The greases used in the test are commercially available lithium complex grease D, calcium complex grease E, and aluminum complex grease F. The amount of test sample is 80mg, the steel metal grease cup, the heating temperature is 230°C, and the air flow is 20mL·min -1 , the oxidation time is 30min, 40min, 50min. The washing solvent is petroleum ether, analytically pure.

[0044] (2) Test results

[0045] Table 3 Oxidation performance measurement results of different complex soap base greases

[0046]

[0047]As can be seen from the measurement results of the oxidation properties of three kinds of complex soap-based greases in Table 3, in the inventive method, the evaporation loss value and the oxidation induction time of each grease sample under the same oxidation time are superior to those of composite lithium-based grease D. Composite calcium-based grease E and composite aluminum-based grease F; From the comparison of the measurement...

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Abstract

The invention discloses a method for rapid assessing high-temperature oxidation resistance of lubricating grease and belongs to the technical field of the lubricating grease. The method comprises the steps of weighing a small quantity of lubricating grease sample into a testing grease cup, placing the grease cup contained with the sample into an oxidimetry instrument heating groove with constant temperature, leading a certain flow of air into the groove, taking out the grease cup oxidized in different time, weighing the mass of the grease cup before and after the sample is oxidized, calculating an evaporation loss value of the sample in different testing time, using a solvent to wash the lubricating grease sample in the grease cup and performing infrared spectroscopic analysis to confirm the oxidation induction time of the lubricating grease sample. The oxidation resistance of lubricating grease can be rapidly assessed according to the evaporation loss value and the oxidation induction time. The method for rapid assessing the high-temperature oxidation resistance of the lubricating grease has the advantages of being simple in test device and operation process, short in detection time, accurate in detection result and good in repeatability.

Description

technical field [0001] The invention relates to a rapid evaluation method for the high-temperature oxidation resistance performance of lubricating grease, which belongs to the technical field of lubricating grease. Background technique [0002] As we all know, during the storage and use of grease, due to heat and contact with air, coupled with the catalysis of the storage container or the metal at the friction part, the grease will be oxidized and deteriorated, resulting in an increase in acid value and poor performance. Causes problems such as corrosion and oil separation, and mechanical failure in severe cases. Therefore, the oxidation stability of lubricating grease is a very important factor related to its maximum service temperature and service life, and its performance directly affects the use quality and storage stability of lubricating grease. With the rapid development of mechanical technology, the requirements for high temperature performance and extended service ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N5/04G01N21/3563
Inventor 胡建强张永国费逸伟杨士钊郭力谢凤季峰郝敬团
Owner 中国人民解放军空军勤务学院
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