Method for Determination of Antioxidant Content in Lubricating Oil by Linear Sweep Voltammetry

A linear scanning and anti-oxidant technology, applied in the field of electrochemical detection, can solve the problems of high-performance liquid chromatography, high test cost, unsuitable type for the determination of anti-oxidant, and long operation time of thin-layer chromatography, so as to improve sensitivity , rigorous measurement links, and the effect of expanding applicability

Active Publication Date: 2017-03-08
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 Determination of Antioxidant Content in Lubricating Oil by Linear Sweep Voltammetry
  • Method for Determination of Antioxidant Content in Lubricating Oil by Linear Sweep Voltammetry
  • Method for Determination of Antioxidant Content in Lubricating Oil by Linear Sweep Voltammetry

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Effect test

Embodiment 1

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

[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. Using PARSTAT 2273 electrochemical workstation, add different volumes of 2mg / ml 2,4-dimethyl-6-tert-butylphenol 96% (volume fraction) ethanol solution to 10ml homemade sulfuric acid, anhydrous In the electrolytic cell of the acidic electrolyte solution of ethanol and sodium dodecyl sulfonate, stir evenly with a glass rod, let it stand for a while, and insert the three-electrode system. The working electrode is a gold disc electrode and the auxiliary electrode is a platinum plate. The electrode is Ag / AgCl, and linear sweep voltammetry is used to sweep from 0.6v to 1.6v at a scanning speed of 5mv / s to obtain the characteristic voltammetric curves of diff...

Embodiment 2

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

[0044] The mineral oil (500SN) 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, 73h, 96h, 120h mineral oil (500SN) sample. Using PARSTAT 2273 electrochemical workstation, different volumes of 2mg / ml 2,4-dimethyl-6-tert-butylphenol 96% ethanol solution were added to 10ml homemade sulfuric acid, absolute ethanol and 12 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, and insert the three-electrode system. The working electrode is a gold disc electrode, the auxiliary electrode is a platinum plate, and the reference electrode is Ag / AgCl, using linear sweep voltammetry to sweep from 0.6v to 1.6v at a scanning speed of 5mv / s, to obtain the characteristic voltammetric curves ...

Embodiment 3

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

[0051] The mineral oil (500SN) containing 1% by mass of T501 was aged in an oven at 120°C, and samples of mineral oil (500SN) with aging time of 14h, 24h, 73h, 96h, and 120h were collected. Using PARSTAT 2273 electrochemical workstation, add different volumes of standard 2mg / ml T501 96% ethanol solution to the electrolytic cell containing 10ml of homemade sulfuric acid, absolute ethanol and sodium dodecyl sulfonate electrolyte. Stir the glass rod evenly, let it stand for a while, and insert the three-electrode system. The working electrode is a gold disc electrode, the auxiliary electrode is a platinum plate, and the reference electrode is Ag / AgCl. Linear scanning voltammetry is used at a scanning speed of 5mv / s. Sweep from 0.6v to 1.6v, get the characteristic voltammetry curve diagram of different concentration of T501 (see attached Figure 4 ), the concentrati...

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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 uses linear sweep voltammetry to measure the content of antioxidants in lubricating oil, and belongs to the technical field of electrochemical detection. Background technique [0002] The lubricating oil will deteriorate during use, and the lubricating oil will 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 make the oil change Thick and hard. 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 obviously improve the anti-oxidation ability of oil products and greatly extend the service life of oil products. However, during the use of lubricating oil, antioxidants will degrade at a certain rate, which depends on the conditions of use. When the lev...

Claims

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Application Information

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Patent Type & Authority Patents(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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