CN103837566B - A kind of method of the detection viscosity index improver containing hypocrystalline glue - Google Patents
A kind of method of the detection viscosity index improver containing hypocrystalline glue Download PDFInfo
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- CN103837566B CN103837566B CN201210490514.0A CN201210490514A CN103837566B CN 103837566 B CN103837566 B CN 103837566B CN 201210490514 A CN201210490514 A CN 201210490514A CN 103837566 B CN103837566 B CN 103837566B
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Abstract
The method that the present invention relates to a kind of detection viscosity index improver containing hypocrystalline glue, comprises the following steps: dry glue separated from glutinous finger agent；Dry glue sample is placed in crucible, under DSC pattern, eliminates thermal history；Heating scan recording curve is carried out under MDSC pattern；Melted endothermic peak on curve 40 DEG C ~ 60 DEG C intervals is integrated and calculates heat enthalpy value；Size according to heat enthalpy value judges whether contain hypocrystalline glue in the agent of glutinous finger；The feature of the method is to eliminate the interference of the factors such as sample viscosity, base oil kind, second the third glue batch, can detect the glue that hypocrystalline glue and unformed glue ratio are even lower for 1:9, has sensitivity and the reliability of height.
Description
Technical field
The present invention relates to the detection method of a kind of lube oil additive, a kind of method being used for the accurately detection viscosity index improver containing hypocrystalline glue.
Background technology
Ethylene-propylene copolymer viscosity index improver (hereinafter referred to as glutinous finger agent) is to produce a kind of additive that consumption of lubricating oil is maximum at present.It is to be completely dissolved in base oil by a certain proportion of second the third glue to be formed, and plays and increase viscosity and improve the effect of Viscosity Index in oil product.Second the third glue is divided into unformed glue and two kinds of hypocrystalline glue, and the ethylene contents of usual hypocrystalline glue is 65% or higher, and the ethylene contents of unformed glue is then between 45% ~ 55%.When hypocrystalline glue has identical shear stability index with unformed glue, the former thickening ability is higher, therefore has more obvious economic worth.But owing to hypocrystalline glue has higher ethylene contents, in its immanent structure, ethylene sequence is the most longer.When hypocrystalline glue is used in paraffin base oil, longer ethylene sequence is easily and base oil forms eutectic structure, so that the cryogenic property of oil product suffers damage, is embodied in pour point rising, low-temperature pumpability variation etc..After oil product uses a period of time, this phenomenon is particularly evident.Therefore, in medium-to-high grade lubricating oil, should avoid using semicrystalline second the third glue as far as possible.
At present, can detect in the agent of glutinous finger whether contain semicrystalline second the third glue by infrared method, detailed process is: first second the third dry glue in glutinous finger agent separated with extraction equipment for fat, again with the ethylene contents of infrared spectrometer detection second the third glue, judge the most whether contain hypocrystalline glue by ethylene contents.Even if same second the third glue producer also is difficult to ensure that the product of its different batches has identical ethylene contents, if therefore simply mixing a small amount of hypocrystalline glue in glutinous finger agent, such as about 1%, then infrared spectrometer is used accurately to detect.
Chinese invention patent discloses the method for hypocrystalline glue content in a kind of estimated viscosity index improver of Application No. 200910242072.6, the method uses small rotary viscometer (MRV) to measure the yield stress of glue at-10 DEG C, calculates the content of hypocrystalline glue according to the size of measured value.Hypocrystalline glue can be measured by the method with the glue that unformed glue ratio is 2/8 or above, and test result depends on the viscosity of glue, therefore it is required that the 100 of each sample DEG C of dynamic viscosities are at 670 ~ 720mm2/ s, and 100 of the sample on actual market DEG C of dynamic viscosities are at 500 ~ 3000mm2/ s, it is difficult to meeting the detection range limited, therefore the method application is restricted.Additionally, the yield stress size that glue is at low temperatures is not only relevant with the content of hypocrystalline glue, also the type of contained base oil is closely related with glutinous finger agent.In the base oil such as cycloalkyl or alkylnaphthalene, hypocrystalline glue is difficult to and the structure of base oil molecules formation eutectic, and therefore yield value of stress also can lower；In I class, II class, Group III and PAO base oil, the performance of yield stress the most difference, therefore the method is not suitable for the detection sample containing dissimilar base oil.
Summary of the invention
The method that it is an object of the invention to provide a kind of detection viscosity index improver containing hypocrystalline glue, the method detection sensitivity is high, and accurately, reliably, method is simple for testing result.
Detection of the present invention contains the method for the viscosity index improver of hypocrystalline glue, and the method comprises the following steps:
A. second the third glue separates: by petrochemical industry and oil product industry standard SH/T0034, separated by second the third glue from ethylene-propylene copolymer viscosity index improver glue；
B. differential calorimetric scan instrument (DSC) is opened under nitrogen or other inert gas shielding, and with nitrogen or other inert gas purge DSC instrument during whole detection, air-flow size keeps stable；
C. eliminate thermal history: entered by second the third mucilage binding separated in differential calorimetric scan instrument DSC sealed aluminum crucible, seal, as sample crucible with sample-pressing device compacting；Take a same empty crucible, seal as reference crucible with sample-pressing device compacting, sample crucible and reference crucible are put into DSC sample cell, sample is under common DSC pattern, heating rate with 1 ~ 20 DEG C/min, rise between 100 DEG C ~ 300 DEG C after any one temperature from room temperature, then be down to less than 0 DEG C with 1 ~ 20 DEG C/min slow cooling speed；
Under D, adjustment differential calorimetric scan instrument to modulating mode (MDSC), rise to 140 DEG C with the heating rate of 1 ~ 20 DEG C/min from less than 0 DEG C, record temperature-rise period, form heating curve；
E, under modulating mode (MDSC) heating curve process, under conditions of melted endothermic peak exists, more smooth place, both sides takes at 2 and sets up a base-line extension, if summit temperature o'clock is between 40 DEG C～60 DEG C, calculates the heat enthalpy value J/g of melted endothermic peak phase transformation；
F, draw testing result:
If MDSC heating curve occurs melted endothermic peak between 40 DEG C～60 DEG C, being integrated processing to it, Integral Processing result is heat enthalpy value > 0.1J/g, it is determined that containing hypocrystalline glue in this sample；
If MDSC heating curve does not occurs that between-20 DEG C～140 DEG C melted endothermic peak or curve may occur faint fluctuation somewhere, but Integral Processing result is heat enthalpy value < 0.1J/g, it is determined that this sample is formed by unformed peptization solution completely.
In step C, sample, under common DSC pattern, with the heating rate of 1 ~ 20 DEG C/min, rises to any one temperature between 150 DEG C ~ 300 DEG C from room temperature.
In step C, sample, under common DSC pattern, is down to less than-20 DEG C with 3 ~ 10 DEG C/min slow cooling speed.
In step C, D, rising gentle rate of temperature fall is 3 DEG C/min ~ 10 DEG C/min.
The feature of this method is: first separated from viscosity index improver glue by second the third glue, then uses modulation system differential calorimetric scan to carry out the detection of the viscosity index improver containing hypocrystalline glue.Second the third glue is separated from glue and detects again, the interference to testing result of glue sample initial viscosity, base oil kind can be got rid of, make testing result reliability higher.Hypocrystalline glue is due to the molecular structure of its uniqueness, during to its temperature scanning, there will be obvious thermal change in specific temperature range (usually 40 DEG C ~ 60 DEG C), and this change can be detected by differential calorimetric scan (DSC).Modulation system differential calorimetric scan (MDSC) is compared with the DSC of traditional mode, it is achieved that high-resolution and highly sensitive unification, even if hypocrystalline glue only has 1:9 with the relative scale of amorphous glue in second third glue of test, still accurately can be detected by MDSC.Therefore, the method that the present invention relates to has susceptiveness and the reliability of height.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 DSC curve figure without hypocrystalline glue sample；
Fig. 2 is the embodiment of the present invention 2 DSC curve figure containing part hypocrystalline glue sample；
Fig. 3 is the embodiment of the present invention 3 DSC curve figure containing hypocrystalline glue sample.
Detailed description of the invention
Embodiment 1
The present embodiment carries out detection according to the following steps and operates:
1, taking unformed glue and the base oil of 90% of 10%, join in beaker and mix, be heated to 80 DEG C, stirring to unformed glue is completely dissolved in base oil, and the ethylene-propylene copolymer viscosity index improver sample being configured to is placed under dry environment cooling.
2, by petrochemical industry and oil product industry standard SH/T0034, second the third glue is separated from ethylene-propylene copolymer viscosity index improver sample, and preserves in dry environments.
3, differential calorimetric scan instrument (DSC) is opened under nitrogen protective condition, and purge DSC instrument with drying nitrogen with stable air velocity during whole detection.
4, take second the third glue i.e. dry glue about 3.0mg ~ 4.0mg and load differential calorimetric scan instrument sealed aluminum crucible tongs, after covering crucible cover, seal, as sample crucible with sample-pressing device compacting.Take a same empty crucible tongs, after covering crucible cover, seal as reference crucible with sample-pressing device compacting, sample crucible and reference crucible are put into differential calorimetric scan instrument sample cell.
5, differential calorimetric scan instrument is in the normal mode, rises to 260 DEG C with the temperature rise speed of 10 DEG C/min from room temperature, is then down to-30 DEG C with the speed of 5 DEG C/min from 260 DEG C, eliminates the thermal history of dry glue.
6, adjusting differential calorimetric scan instrument under modulating mode, be warming up to 140 DEG C with the speed of 3 DEG C/min from-30 DEG C, modulation amplitude is ± 0.5 DEG C, and modulation period is 40s.Draw heating curve by temperature-rise period, see Fig. 1.It can be seen that there is not melted endothermic peak at 40 DEG C ~ 60 DEG C, therefore heat enthalpy value is 0.Testing result is without hypocrystalline glue in sample, and this result matches without hypocrystalline glue composition in preparation sample.
Embodiment 2
Detection sample preparation, joining in base oil by unformed glue and hypocrystalline glue in the ratio of 9:1, two kinds of dry glue account for the 10% of total amount, are heated to 100 DEG C, stirring is completely dissolved in base oil to dry glue, and the ethylene-propylene copolymer viscosity index improver sample being configured to is placed under dry environment cooling.
Detect according to the step in embodiment 1 and condition, the heating curve drawn is shown in Fig. 2, as can be seen from the figure, melted endothermic peak is occurred in that at 46.46 DEG C, after being integrated this peak processing, obtaining heat enthalpy value is 0.2354J/g, more than the criterion of 0.1J/g, testing result is containing hypocrystalline glue in sample, and this result is added with hypocrystalline glue composition in sample matches with preparing.
Embodiment 3
Detection sample preparation, joins the hypocrystalline glue of 10% in the base oil of 90%, is heated to 100 DEG C, and stirring is completely dissolved in base oil to dry glue, and the ethylene-propylene copolymer viscosity index improver sample being configured to is placed under dry environment cooling.
Detect according to the step in embodiment 1 and condition, the heating curve drawn is shown in Fig. 3, as can be seen from the figure, melted endothermic peak is occurred in that at 46.73 DEG C, after being integrated this peak processing, obtaining heat enthalpy value is 4.038J/g, more than the criterion of 0.1J/g, testing result is containing hypocrystalline glue in sample, and this result is added with hypocrystalline glue composition in sample matches with preparing.
Embodiment 4
Unformed glue and hypocrystalline glue are joined in base oil in the ratio of 8:2, two kinds of dry glue account for the 10% of total amount, being heated to 100 DEG C, stirring is completely dissolved in base oil to dry glue, and the ethylene-propylene copolymer viscosity index improver sample being configured to is placed under dry environment cooling.
By petrochemical industry and oil product industry standard SH/T0034, second the third glue is separated from ethylene-propylene copolymer viscosity index improver sample, and preserves in dry environments.
Differential calorimetric scan instrument (DSC) is opened under nitrogen protective condition, it would however also be possible to employ other noble gas, and purge DSC instrument with drying nitrogen with stable air velocity during whole detection.
Take second the third glue i.e. dry glue about 3.0mg ~ 4.0mg and load differential calorimetric scan instrument DSC sealed aluminum crucible tongs, after covering crucible cover, seal, as sample crucible with sample-pressing device compacting.Take a same empty crucible tongs, after covering crucible cover, seal as reference crucible with sample-pressing device compacting, sample crucible and reference crucible are put into differential calorimetric scan instrument sample cell.
Differential calorimetric scan instrument in the normal mode, rises to 100 DEG C with the temperature rise speed of 20 DEG C/min from room temperature, is then down to-10 DEG C with the speed of 1 DEG C/min from 100 DEG C, eliminates the thermal history of dry glue.
Adjusting differential calorimetric scan instrument under modulating mode, be warming up to 200 DEG C with the speed of 1 DEG C/min from-10 DEG C, modulation amplitude is ± 0.5 DEG C, and modulation period is 40s., there are melted endothermic peaks at 47.30 DEG C in record heating curve, its heat enthalpy value 0.5329J/g, and more than the criterion of 0.1J/g, testing result is containing hypocrystalline glue in sample, and this result is added with hypocrystalline glue composition in sample matches with preparing.
Embodiment 5
Unformed glue and hypocrystalline glue are joined in base oil in the ratio of 7:3, two kinds of dry glue account for the 10% of total amount, being heated to 100 DEG C, stirring is completely dissolved in base oil to dry glue, and the ethylene-propylene copolymer viscosity index improver sample being configured to is placed under dry environment cooling.
By petrochemical industry and oil product industry standard SH/T0034, second the third glue is separated from ethylene-propylene copolymer viscosity index improver sample, and preserves in dry environments.
Differential calorimetric scan instrument (DSC) is opened under the conditions of argon shield, and purges DSC instrument with dry argon gas with stable air velocity during whole detection.
Take second the third glue i.e. dry glue about 3.0mg ~ 4.0mg and load differential calorimetric scan instrument DSC sealed aluminum crucible tongs, after covering crucible cover, seal, as sample crucible with sample-pressing device compacting.Take a same empty crucible tongs, after covering crucible cover, seal as reference crucible with sample-pressing device compacting, sample crucible and reference crucible are put into differential calorimetric scan instrument sample cell.
Differential calorimetric scan instrument in the normal mode, rises to 100 DEG C with the temperature rise speed of 20 DEG C/min from room temperature, is then down to 0 DEG C with the speed of 10 DEG C/min from 100 DEG C, eliminates the thermal history of dry glue.
Adjusting differential calorimetric scan instrument under modulating mode, be warming up to 260 DEG C with the speed of 10 DEG C/min from 0 DEG C, modulation amplitude is ± 0.5 DEG C, and modulation period is 40s., there is melted endothermic peak, its heat enthalpy value 1.055J/g at 46.94 DEG C in record heating curve, and more than the criterion of 0.1J/g, testing result is containing hypocrystalline glue in sample.This result matches containing hypocrystalline glue composition with sample.
Embodiment 6
Unformed glue and hypocrystalline glue are joined in base oil in the ratio of 3:7, two kinds of dry glue account for the 10% of total amount, being heated to 90 DEG C, stirring is completely dissolved in base oil to dry glue, and the ethylene-propylene copolymer viscosity index improver sample being configured to is placed under dry environment cooling.
By petrochemical industry and oil product industry standard SH/T0034, second the third glue is separated from ethylene-propylene copolymer viscosity index improver sample, and preserves in dry environments.
Differential calorimetric scan instrument (DSC) is opened under helium protective condition, and purges DSC instrument by dry helium gas with stable air velocity during whole detection.
Take second the third glue i.e. dry glue about 3.0mg ~ 4.0mg and load differential calorimetric scan instrument DSC sealed aluminum crucible tongs, after covering crucible cover, seal, as sample crucible with sample-pressing device compacting.Take a same empty crucible tongs, after covering crucible cover, seal as reference crucible with sample-pressing device compacting, sample crucible and reference crucible are put into differential calorimetric scan instrument sample cell.
Differential calorimetric scan instrument in the normal mode, rises to 300 DEG C with the temperature rise speed of 15 DEG C/min from room temperature, is then down to-20 DEG C with the speed of 10 DEG C/min from 300 DEG C, eliminates the thermal history of dry glue.
Adjusting differential calorimetric scan instrument under modulating mode, be warming up to 140 DEG C with the speed of 5 DEG C/min from-20 DEG C, modulation amplitude is ± 0.5 DEG C, and modulation period is 40s., there is melted endothermic peak, its heat enthalpy value 3.311J/g at 48.01 DEG C in record heating curve, and more than the criterion of 0.1J/g, testing result is containing hypocrystalline glue in sample.This result matches with being added with hypocrystalline glue composition in sample.
Claims (4)
1. a method for the detection viscosity index improver containing hypocrystalline glue, is characterized in that the method comprises the following steps:
A. second the third glue separates: by petrochemical industry and oil product industry standard SH/T0034, separated by second the third glue from ethylene-propylene copolymer viscosity index improver glue；
B. differential calorimetric scan instrument DSC is opened under nitrogen or inert gas shielding, and with nitrogen or inert gas purge DSC instrument during whole detection, air-flow size keeps stable；
C. eliminate thermal history: entered by second the third mucilage binding separated in differential calorimetric scan instrument DSC sealed aluminum crucible, seal, as sample crucible with sample-pressing device compacting；Take a same empty crucible, seal as reference crucible with sample-pressing device compacting, sample crucible and reference crucible are put into DSC sample cell, sample is under common DSC pattern, heating rate with 1～20 DEG C/min, after any one temperature that room temperature rises between 100 DEG C～300 DEG C, then it is down to less than 0 DEG C with 1～20 DEG C/min slow cooling speed；
D. adjust differential calorimetric scan instrument under modulating mode MDSC, rise to more than 140 DEG C with the heating rate of 1～20 DEG C/min from less than 0 DEG C, record temperature-rise period, formation heating curve；
E. processing the heating curve under modulating mode MDSC, under conditions of melting peak exists, more smooth place, both sides takes at 2 and sets up a base-line extension, if summit temperature o'clock is between 40 DEG C～60 DEG C, calculates the heat enthalpy value J/g of melting peak phase transformation；
F. testing result is drawn:
If MDSC heating curve endothermic peak occurs between 40 DEG C～60 DEG C, being integrated processing to it, Integral Processing result is heat enthalpy value > 0.1J/g, it is determined that containing hypocrystalline glue in this sample；
If MDSC heating curve does not occurs that between-20 DEG C～140 DEG C endothermic peak or curve occur faint fluctuation somewhere, but Integral Processing result is heat enthalpy value < 0.1J/g, it is determined that this sample is formed by unformed peptization solution completely.
The method of a kind of detection the most according to claim 1 viscosity index improver containing hypocrystalline glue, it is characterized in that in step C, sample, under common DSC pattern, with the heating rate of 1-20 DEG C/min, rises to any one temperature between 150 DEG C～300 DEG C from room temperature.
The method of a kind of detection the most according to claim 1 viscosity index improver containing hypocrystalline glue, is characterized in that in step C, and sample, under common DSC pattern, is down to less than-20 DEG C with 3～10 DEG C/min slow cooling speed.
The method of a kind of detection the most according to claim 1 viscosity index improver containing hypocrystalline glue, is characterized in that in step C, D, and rising gentle rate of temperature fall is 3 DEG C/min～10 DEG C/min.
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| CN106770427A (en) * | 2017-01-19 | 2017-05-31 | 南京师范大学 | A kind of heat analysis method for determining each phase constituent content of hypocrystalline macromolecular material |
| CN106867465A (en) * | 2017-03-05 | 2017-06-20 | 江苏华盛节能科技有限公司 | A kind of phase-changing energy storage material technology |
| CN109030555A (en) * | 2018-08-17 | 2018-12-18 | 内蒙古蒙牛乳业（集团）股份有限公司 | A kind of test method of gel moisture holding capacity |
| CN110579692B (en) * | 2019-09-17 | 2021-07-06 | 国网四川省电力公司电力科学研究院 | Method for rapidly measuring crosslinking degree of XLPE cable on site |
| CN110726750B (en) | 2019-09-19 | 2022-06-03 | 江苏厚生新能源科技有限公司 | Method for detecting oil content of lithium battery diaphragm by using DSC (differential scanning calorimetry) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0559362A1 (en) * | 1992-03-02 | 1993-09-08 | Ta Instruments, Inc. | Method and apparatus for modulated differential analysis |
| CN102087190A (en) * | 2009-12-03 | 2011-06-08 | 中国石油天然气股份有限公司 | Method for measuring hemicrystalline glue content in viscosity index improver |
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| JP2003042985A (en) * | 2001-08-03 | 2003-02-13 | Seiko Instruments Inc | Differential scanning calorimeter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0559362A1 (en) * | 1992-03-02 | 1993-09-08 | Ta Instruments, Inc. | Method and apparatus for modulated differential analysis |
| CN102087190A (en) * | 2009-12-03 | 2011-06-08 | 中国石油天然气股份有限公司 | Method for measuring hemicrystalline glue content in viscosity index improver |
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