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A Method for Measuring Effective Components of Synthetic Lubricating Grease Using Gas Chromatography

A technology of gas chromatography and active ingredients, which is applied in the field of determining the composition of lubricating grease, can solve the problems of lack of detection standards for synthetic lubricating grease, and achieve the effects of lowering the vaporization point, good reproducibility, and reducing load

Active Publication Date: 2018-09-04
FOSHAN SHUNDE FUYANSHENG LUBRICANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is a lack of testing standards for the effective components of synthetic grease in the national standard, so it is necessary to propose a component detection method to determine the active components of synthetic grease

Method used

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  • A Method for Measuring Effective Components of Synthetic Lubricating Grease Using Gas Chromatography
  • A Method for Measuring Effective Components of Synthetic Lubricating Grease Using Gas Chromatography
  • A Method for Measuring Effective Components of Synthetic Lubricating Grease Using Gas Chromatography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In this example, the singleness comparison is adopted, petroleum ether is selected as the extraction agent, and two commonly used additives are selected for gas chromatography detection to obtain the chromatogram of the additive detection solution. These two additives are antioxidants and rust inhibitors respectively. , each group of additives was carried out 5 times in parallel, and the chromatographic peak retention time of the obtained additive test solution was summarized in Table 1, and the chromatographic peak retention time range of the two additives was obtained.

[0050] Table 1

[0051]

[0052] In this embodiment, the antioxidant is diphenylamine, the rust inhibitor is sorbitan monooleate, and the chromatogram of the obtained additive test solution is a single peak chromatogram. In order to improve the reliability of the test, ensure that the retention time of the chromatographic peak in Table 1 is the retention time of the peak of the additive detection s...

Embodiment 2

[0054] The base oil used in the sample of this embodiment is a synthetic oil containing pentaerythritol tetraester oil. This pentaerythritol tetraester oil is generated by the esterification reaction between pentaerythritol and two fatty acids. Its active ingredients contain 5 effective substances, and, Since this reaction is an incomplete reversible reaction, besides additives, there are active ingredients and incompletely reacted by-products in the sample.

[0055] The sample quantitative test needs to carry out at least 3 parallel tests, and the present embodiment carries out 4 parallel tests altogether, and the chromatogram of the sample test liquid of gained is as follows Figure 2-Figure 5 As shown, the retention time of each component chromatographic peak in the sample is obtained.

[0056] Calculation of analysis results of active ingredients

[0057] Using the area normalization algorithm, the content of component i is calculated by the following formula:

[0058] ...

Embodiment 3

[0070] Embodiment 3: The base oil used in the sample of this embodiment is a synthetic oil containing pentaerythritol tetraester oil. This pentaerythritol tetraester oil is generated by the esterification reaction between pentaerythritol and two fatty acids. Its active ingredients contain 5 effective substances, and since this reaction is an incomplete reversible reaction, in addition to additives, there are active ingredients and incompletely reacted by-products in the sample.

[0071] Take 0.16g sample and dilute it to 10ml with petroleum ether, measure 0.8μl sample test liquid and inject, carry out gas chromatography analysis and detection, set up the chromatogram of sample test liquid, the chromatogram of gained sample test liquid is as follows Image 6 As shown, the retention time of each component chromatographic peak in the sample is obtained.

[0072] analyze Image 6 , there are 10 chromatographic peaks in the sample test solution, and the separation process of each ...

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Abstract

The invention discloses a method for determining active ingredients of synthetic grease by using gas chromatography. The method comprises the following steps: S1, extracting an additive by using petroleum ether or chromatographic methanol to obtain additive detection liquor; S2, regulating and optimizing gas chromatography parameters, performing quantitative sample injection on the tested additiveliquid, performing gas chromatography analysis and detection, establishing a chromatogram of the tested additive liquid to obtain a chromatographic peak retention time range of the additive, and establishing a chromatogram group of the additive detection liquor; S3, diluting and extracting the samples by using petroleum ether or alkane and other organic solvents so as to obtain sample detection liquor; S4, holding the gas chromatography a parameters, performing quantitative sample injection on the samples, performing gas chromatography analysis and detection, and establishing a chromatogram of the sample liquid tested; and S5, analyzing and calculating the chromatogram of the sample liquid tested, and determining the content of the active ingredients in the samples. According to the method, the ratio of each component in the synthetic grease can be easily analyzed, the detection result is accurate, and the method is time-saving and high-efficiency.

Description

technical field [0001] The invention relates to a method for determining the components of lubricating grease used in machine parts, vehicles or other lubricating mechanisms, in particular to a method for determining the effective components of synthetic lubricating grease using gas chromatography. Background technique [0002] Synthetic lubricating grease is a semi-solid lubricant for mechanical parts made of synthetic lubricating oil as the base oil, adding corresponding thickeners and lubricating additives. Compared with petroleum lubricating grease, this kind of lubricant has better high and low temperature resistance, High vacuum resistance, chemical stability, flame retardancy and radiation resistance, etc., used for lubrication parts of military and civilian equipment with harsh working conditions. Synthetic lubricating grease is generally composed of 10%-20% thickener, 75%-90% base oil, less than 5% additives and fillers. The conversion rate of reaction into active i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 张军霍庆权
Owner FOSHAN SHUNDE FUYANSHENG LUBRICANT