CN110441378A - A kind of evaluation method of oil ageing degree - Google Patents
A kind of evaluation method of oil ageing degree Download PDFInfo
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- CN110441378A CN110441378A CN201910688549.7A CN201910688549A CN110441378A CN 110441378 A CN110441378 A CN 110441378A CN 201910688549 A CN201910688549 A CN 201910688549A CN 110441378 A CN110441378 A CN 110441378A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/48—Systems using polarography, i.e. measuring changes in current under a slowly-varying voltage
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Abstract
The instrument that the invention belongs to use in lubricants performance test field more particularly to a kind of evaluation method and evaluation method of oil ageing degree.Present invention mainly solves the prior arts can not be at the scene in Fast Evaluation lubricating oil the problem of antioxidant degree of aging.The present invention realizes jointly by using the determining instrument and solution.Used instrument can apply voltage to linear by electrode, and to fixed pulse is loaded in voltage ladder, electrode can acquire generated electric current simultaneously.Used solution contains acetophenone, ethyl alcohol and selected from least one of lithium perchlorate, lithium chloride electrolyte；Wherein, the percentage by volume of acetophenone is 20-100%, the percentage by volume of ethyl alcohol is 10-80%；The concentration of electrolyte is 0.1-0.5 mol/L in solution.Above technical scheme preferably solves the problems, such as this, can be used for measuring amine antioxidant content in lubricating oil, to assess oil ageing degree.
Description
Technical field
The invention belongs to lubricants performance test field more particularly to a kind of oil ageing degree evaluation method and
The instrument used in evaluation method.
Background technique
Oil ageing situation depends primarily on the content of antioxidant in oil liquid, the content of antioxidant and the aging of oil product
Degree is closely bound up, therefore monitors in the decay trend and degree that will be helpful to understand lubricating oil with the content of antioxidant in oil,
Its residual life is assessed, determines the Best Times that machine is changed oil, avoids in advance or postpone the waste or harm of generation of changing oil.It is common
Amine antioxidant be alkyl diphenylamine and/or N- phenyl-a- naphthylamines, and with antioxidant and Lubricating Oil Technique progress, amine antioxygen
Agent has been not limited only to this.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of evaluation method of oil ageing degree, and should
The instrument used in evaluation method, mainly solving the prior art can not antioxidant degree of aging in Fast Evaluation lubricating oil at the scene
The problem of.Use the equipment can Accurate Determining weight percent concentration contain for amine antioxidant in the lubricating oil of 0.001-0.5%
Amount.
The evaluation method of oil ageing degree of the present invention, specifically includes the following steps:
In step 1, measurement lubricating oil when amine antioxidant content, electrolyte is added in vial and contains amine antioxidant
Lubricating oil, sufficiently oscillation are uniformly mixed lubricating oil with solution, and entire mixed liquor is in transparent and homogeneous shape；Contain in the electrolyte
Acetophenone, ethyl alcohol and be selected from least one of lithium perchlorate, lithium chloride electrolyte；Wherein, the percentage by volume of acetophenone is
20-100%, ethyl alcohol percentage by volume be 10-80%；The concentration of electrolyte is 0.1-0.5 mol/L in electrolyte.
Step 2, instrument for measuring the content of amine antioxidant in lubricating oil are that one kind can be by electrode to solution line
Property applies alive instrument, and to fixed pulse is loaded in voltage ladder, electrode can acquire generated electric current simultaneously；It is wet with ethyl alcohol
The electrode surface of the electrode cloth cleaning instrument of profit, inserting electrodes into vial submerges electrode surface by bottom liquid completely, fixed
Vial and electrode, record amine antioxidant pulse voltammetry scan appearance section.
Preferably, the volume ratio of the electrolyte and lubricating oil is 5-15.
Preferably, the amine antioxidant is fragrant amine type antioxidant, the fragrance amine type antioxidant be alkyl diphenylamine and/
Or N- phenyl-a- naphthylamines.
Preferably, the percentage by volume of the acetophenone is 20-80 volume %.
Preferably, the percentage by volume of the ethyl alcohol is 20-60 volume %.
Preferably, electrolyte concentration is 0.1-0.2 mol/L in the electrolyte.
Preferably, 0 volt~+1.0 volt of voltage range.
Preferably, the pulse height is from 50 millivolts to 100 millivolt.
In above-mentioned technical proposal, the range of linearity concentration of N- phenyl-a- naphthylamines is 0.005%-0.5% weight %.Electrolysis
Liquid utilizes the range of linearity concentration of Pulse Voltammetry scanning method measurement amine antioxidant after mixing with lubricating oil be 0.001%-0.5%.
Significant technical effect of the invention.
The measurement that amine antioxidant content can be carried out using present device can be pushed away by comparing the attenuation of amine antioxidant
Oil ageing degree is surveyed, preferable technical effect is achieved.
The electrochemical analysis method that the present invention uses is that one kind can measure antioxidant residual quantity in lubricating oil
Analysis method is that one kind can be according to the technology of antioxidant class discrimination and whole detection.When sufficiently large to electrode application one
Voltage when, electrochemical oxidation-reduction reaction occurs on inert glass-carbon electrode for antioxidant and other electroactive substances.
Oxidation reaction can occur on the electrode for amine antioxidant, to electrode release electronics to obtain voltage-current curve, different type
The oxidation potential value of antioxidant can be mutually distinguishable, and current strength and the antioxidant concentration in solution are linear.Electrochemistry side
Pulse Voltammetry scanning method in method is not limited only to the measurement of alkyl diphenylamine and/or N- phenyl-a- naphthylamines, is also applied for all amine
The measurement of antioxidant.
Detailed description of the invention
Fig. 1 is the typical amines antioxidant Electrochemical Scanning figure that the embodiment of the present invention obtains.
Fig. 2 is the amine antioxidant Electrochemical Scanning figure for the low concentration that the embodiment of the present invention obtains.
Fig. 3 is that lubricating oil of the embodiment of the present invention is added drop-wise to solution oscillation front and back picture, before oscillation is in a left side, after oscillation is in the right side.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.
Embodiment 1.
The typical amines antioxidant Electrochemical Scanning figure that the present embodiment obtains is shown in Fig. 1, and as 0.0V, current signal is very low in figure,
Without obvious peak.One is obtained since the reducing substances in solution are oxidized in 0.4V or so after voltage continues to increase
Very high oxidation peak, when voltage continues to increase since electrode surface reducing substances are consumed, electric current drops to minimum
Point.Amine antioxidant has similar peak type in 0.4-0.7V voltage range.
The amine antioxidant Electrochemical Scanning figure for the low concentration that the present embodiment obtains, is shown in Fig. 2, concentration range 0.005%-
0.01%.
Lubricating oil is added drop-wise to solution oscillation front and back and sees Fig. 3, and before vial is oscillation in left figure, the vial in right figure is vibration
After swinging.
Claims (8)
1. a kind of evaluation method of oil ageing degree, which is characterized in that specifically includes the following steps:
In step 1, measurement lubricating oil when amine antioxidant content, electrolyte and the lubrication containing amine antioxidant are added in vial
Oil, sufficiently oscillation are uniformly mixed lubricating oil with solution, and entire mixed liquor is in transparent and homogeneous shape；Contain benzene second in the electrolyte
Ketone, ethyl alcohol and be selected from least one of lithium perchlorate, lithium chloride electrolyte；Wherein, the percentage by volume of acetophenone is 20-
100%, the percentage by volume of ethyl alcohol is 10-80%；The concentration of electrolyte is 0.1-0.5 mol/L in electrolyte；
Step 2, the instrument for measuring the content of amine antioxidant in lubricating oil are that one kind can be applied by electrode to linear
Alive instrument, to fixed pulse is loaded in voltage ladder, electrode can acquire generated electric current simultaneously；It is moistened with ethyl alcohol
Electrode cloth cleans the electrode surface of instrument, and inserting electrodes into vial submerges electrode surface by bottom liquid completely, fixed glass
Bottle and electrode, record amine antioxidant pulse voltammetry scan appearance section.
2. the evaluation method of oil ageing degree as described in claim 1, which is characterized in that the electrolyte and lubricating oil
Volume ratio be 5-15.
3. the evaluation method of oil ageing degree as described in claim 1, which is characterized in that the amine antioxidant is fragrance
Amine type antioxidant.
4. the evaluation method of oil ageing degree as claimed in claim 3, which is characterized in that the fragrance amine type antioxidant
For alkyl diphenylamine and/or N- phenyl-a- naphthylamines.
5. the evaluation method of oil ageing degree as described in claim 1, which is characterized in that the volume hundred of the acetophenone
Score is 20-80 volume %；The percentage by volume of the ethyl alcohol is 20-60 volume %.
6. the evaluation method of oil ageing degree as described in claim 1, which is characterized in that electrolyte in the electrolyte
Concentration is 0.1-0.2 mol/L.
7. the evaluation method of oil ageing degree as described in claim 1, which is characterized in that 0.0 volt of the voltage range
~+1.0 volts.
8. the evaluation method of oil ageing degree as described in claim 1, which is characterized in that the pulse height from 50 milli
Volt is to 100 millivolts.
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| CN201910688549.7A CN110441378A (en) | 2019-07-29 | 2019-07-29 | A kind of evaluation method of oil ageing degree |
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| CN201910688549.7A CN110441378A (en) | 2019-07-29 | 2019-07-29 | A kind of evaluation method of oil ageing degree |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6152829B2 (en) * | 1980-02-02 | 1986-11-14 | Seisan Kaihatsu Kagaku Kenkyusho | |
| CN104237362A (en) * | 2014-09-24 | 2014-12-24 | 中国石油化工股份有限公司 | Electrolyte solution and application thereof |
| CN104345085A (en) * | 2013-08-01 | 2015-02-11 | 中国石油化工股份有限公司 | An electrolytic solution and uses thereof |
| WO2016073149A1 (en) * | 2014-11-03 | 2016-05-12 | Exxonmobil Research And Engineering Company | Low transition temperature mixtures or deep eutectic solvents and processes for preparation thereof |
| CN108659932A (en) * | 2018-06-21 | 2018-10-16 | 安徽意力电缆有限公司 | A kind of lubricating oil for track |
| CN109616323A (en) * | 2018-12-17 | 2019-04-12 | 中南大学 | A kind of aluminum electrolytic capacitor electrolyte and preparation method thereof |
-
2019
- 2019-07-29 CN CN201910688549.7A patent/CN110441378A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6152829B2 (en) * | 1980-02-02 | 1986-11-14 | Seisan Kaihatsu Kagaku Kenkyusho | |
| CN104345085A (en) * | 2013-08-01 | 2015-02-11 | 中国石油化工股份有限公司 | An electrolytic solution and uses thereof |
| CN104237362A (en) * | 2014-09-24 | 2014-12-24 | 中国石油化工股份有限公司 | Electrolyte solution and application thereof |
| WO2016073149A1 (en) * | 2014-11-03 | 2016-05-12 | Exxonmobil Research And Engineering Company | Low transition temperature mixtures or deep eutectic solvents and processes for preparation thereof |
| CN108659932A (en) * | 2018-06-21 | 2018-10-16 | 安徽意力电缆有限公司 | A kind of lubricating oil for track |
| CN109616323A (en) * | 2018-12-17 | 2019-04-12 | 中南大学 | A kind of aluminum electrolytic capacitor electrolyte and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 王德岩等: "一种测定润滑油抗氧剂的手段――伏安法", 《润滑油》 * |
| 龚佩等: "润滑油质量快速测定技术", 《现代科学仪器》 * |
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