Method for measuring antioxidant content in lubricating oil by use of linear sweep voltammetry

A linear scanning, antioxidant technology, applied in the field of electrochemical detection, can solve the problems of high test cost of high performance liquid chromatography, long operation time of thin layer chromatography, unsuitable type for the determination of antioxidants, etc., to improve the sensitivity , the measurement process is rigorous, and the effect of expanding the applicability

Active Publication Date: 2015-05-06
WUHAN RES INST OF MATERIALS PROTECTION
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Problems solved by technology

[0003] At present, the methods for determining the content of antioxidants in lubricating oil mainly include infrared spectroscopy, high performance liquid chromatography, gas chromatography-mass chromatography, and thin-layer chromatography. The types of antioxidants are limited and are not suitable for the determination of trace amounts of antioxidants. High-performance liquid chromatography has high testing costs, uses toxic solvents and complicated sample preparation, and thin-layer chromatography takes too long to operate.

Method used

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  • Method for measuring antioxidant content in lubricating oil by use of linear sweep voltammetry
  • Method for measuring antioxidant content in lubricating oil by use of linear sweep voltammetry
  • Method for measuring antioxidant content in lubricating oil by use of linear sweep voltammetry

Examples

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Embodiment 1

[0036]Determination of antioxidant 2,4-dimethyl-6-tert-butylphenol in trimethylolpropane oleate (TMPTO) at aging temperature of 120°C under different aging times:

[0037] The TMPTO containing 1% by mass of 2,4-dimethyl-6-tert-butylphenol was aged in an oven at 120°C, and the aging time was 14h, 24h, 48h, 73h, 96h, 120h TMPTO sample. Adopt PARSTAT 2273 electrochemical workstation, the 96% (volume fraction) ethanol solution of the 2,4-dimethyl-6-tert-butylphenol of standard sample 2mg / ml of different volumes is added to containing 10ml self-made sulfuric acid, anhydrous In the electrolytic cell of the acidic electrolyte solution of ethanol and sodium dodecylsulfonate, stir it evenly with a glass rod, let it stand for a while, insert a three-electrode system, in which the working electrode is a gold disc electrode, the auxiliary electrode is a platinum sheet, and the reference Electrode is Ag / AgCl, adopts linear sweep voltammetry to sweep from 0.6v to 1.6v with the scanning spe...

Embodiment 2

[0043] Determination of antioxidant 2,4-dimethyl-6-tert-butylphenol in mineral oil (500SN) at aging temperature of 120°C under different aging times:

[0044] Mineral oil (500SN) containing 1% by mass of 2,4-dimethyl-6-tert-butylphenol was aged in an oven at 120°C, and the collection aging time was 14h, 24h, 73h, 96h, 120h of mineral oil (500SN) samples. Using PARSTAT 2273 electrochemical workstation, add different volumes of 2mg / ml standard 2,4-dimethyl-6-tert-butylphenol 96% ethanol solution to 10ml homemade sulfuric acid, absolute ethanol and dodecyl In the electrolytic cell of the acidic electrolyte solution of sodium alkyl sulfonate, stir evenly with a glass rod, let it stand for a while, insert a three-electrode system, wherein the working electrode is a gold disc electrode, the auxiliary electrode is a platinum sheet, and the reference electrode is Ag / AgCl, adopt linear sweep voltammetry to sweep from 0.6v to 1.6v with the scanning speed of 5mv / s, obtain the character...

Embodiment 3

[0050] Determination of antioxidant T501 under different aging times in mineral oil (500SN) at 120°C aging temperature:

[0051] Mineral oil (500SN) containing 1% by mass of T501 was aged in an oven at 120°C, and samples of mineral oil (500SN) were collected with aging times of 14h, 24h, 73h, 96h, and 120h. Adopt PARSTAT 2273 electrochemical workstation, join the 96% ethanol solution of the T501 of the standard sample 2mg / ml of different volumes in the electrolytic cell that contains 10ml self-made sulfuric acid, absolute ethanol and sodium dodecylsulfonate electrolyte, use Stir the glass rod evenly, let it stand for a while, and insert it into a three-electrode system, in which the working electrode is a gold disc electrode, the auxiliary electrode is a platinum sheet, and the reference electrode is Ag / AgCl. Linear sweep voltammetry is used at a scanning speed of 5mv / s Sweep from 0.6v to 1.6v, obtain the characteristic voltammetry curves of different concentrations of T501 (s...

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Abstract

The invention provides a method for measuring the antioxidant content in a lubricating oil by use of linear sweep voltammetry, and belongs to the technical field of electrochemical detection. The method comprises the following steps: adding an ethanol solution of which the antioxidant concentration is known to an electrolyte, measuring by use of the linear sweep voltammetry to obtain the characteristic voltage-current curve of the electrolyte, calculating the characteristic peak area of the curve, establishing a working curve of the antioxidant concentration and the characteristic peak area, extracting new lubricating oil with the known antioxidant content and lubricating oil with unknown antioxidant content by using ethanol, adding the supernatant liquid to the electrolyte, measuring by use of the linear sweep voltammetry to obtain the characteristic voltage-current curve of the electrolyte, calculating the characteristic peak area of the curve, and substituting the characteristic peak area of the known antioxidant into the working curve to obtain the correction coefficient of the lubricating oil of the antioxidant to obtain the unknown antioxidant content. The method is simple, convenient and quick to operate, and high in sensitivity, and can be widely applied to the measurement of the antioxidant content in synthetic oil or mineral oil lubricating oil and the rapid evaluation of the oxidative stability of the lubricating oil.

Description

technical field [0001] The invention discloses a method for measuring antioxidant content in lubricating oil by linear sweep voltammetry, belonging to the technical field of electrochemical detection. Background technique [0002] Lubricating oil will deteriorate during use, causing the lubricating oil to lose its proper lubricating effect. The main reason for the deterioration is that oxidation produces acid, sludge, and precipitation. Acid causes corrosion and wear of metal parts; sludge and precipitation cause oil to change. Thick, hardened. In order to improve the oxidation resistance of lubricating oil, it is necessary to add specific compounds to improve the oxidation stability of lubricating oil. The addition of antioxidants can significantly improve the anti-oxidation ability of the oil and greatly prolong the service life of the oil. However, during the use of lubricating oil, antioxidants will degrade at a certain speed, and the degradation rate depends on its us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
Inventor 段海涛向亚玲李健钱绪政金永亮陈亚平
Owner WUHAN RES INST OF MATERIALS PROTECTION
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