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A method for detecting viscosity index improvers containing semi-crystalline gums

A technology of viscosity index and improver, which is applied in the detection field of lubricating oil additives, and can solve the problems such as the reduction of yield stress value

Active Publication Date: 2016-08-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In base oils such as naphthenic or alkyl naphthalene, semi-crystalline gums are not easy to form a eutectic structure with base oil molecules, so the yield stress value will also be reduced; in type I, type II, type III and PAO base oils, The performance of yield stress is also different, so the method is not suitable for testing samples containing different types of base oils

Method used

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  • A method for detecting viscosity index improvers containing semi-crystalline gums
  • A method for detecting viscosity index improvers containing semi-crystalline gums
  • A method for detecting viscosity index improvers containing semi-crystalline gums

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The present embodiment carries out detection operation according to the following steps:

[0024] 1. Take 10% amorphous rubber and 90% base oil, add them into a beaker and mix, heat to 80°C, stir until the amorphous rubber is completely dissolved in the base oil, and improve the viscosity index of the prepared ethylene-propylene copolymer The reagent samples were cooled in a dry environment.

[0025] 2. According to the petrochemical and petroleum product industry standard SH / T0034, separate the ethylene propylene rubber from the ethylene propylene copolymer viscosity index improver sample and store it in a dry environment.

[0026] 3. Turn on the differential calorimetry scanner (DSC) under nitrogen protection conditions, and purge the DSC instrument with dry nitrogen at a stable airflow rate during the entire detection process.

[0027] 4. Take about 3.0mg~4.0mg of ethylene-propylene glue and dry glue, put it into a differential calorimetry scanner to seal the alumin...

Embodiment 2

[0031] Test sample preparation, add amorphous glue and semi-crystalline glue to the base oil at a ratio of 9:1, the two dry glues account for 10% of the total, heat to 100°C, and stir until the dry glue is completely dissolved in the base oil , Place the prepared ethylene-propylene copolymer viscosity index improver sample in a dry environment to cool.

[0032] Detect according to the step and condition in embodiment 1, the temperature rising curve that draws is shown in figure 2 , it can be seen from the figure that a melting endothermic peak appeared at 46.46°C. After integrating the peak, the enthalpy value was 0.2354J / g, which was greater than the criterion of 0.1J / g. The test result was that the sample Contains semi-crystalline gum, which is consistent with the addition of semi-crystalline gum in the prepared sample.

Embodiment 3

[0034] Test sample preparation, add 10% semi-crystalline rubber to 90% base oil, heat to 100°C, stir until the dry rubber is completely dissolved in the base oil, and place the prepared ethylene-propylene copolymer viscosity index improver sample Cool in a dry environment.

[0035] Detect according to the step and condition in embodiment 1, the temperature rising curve that draws is shown in image 3 , it can be seen from the figure that a melting endothermic peak appears at 46.73°C. After integrating the peak, the enthalpy value is 4.038J / g, which is greater than the criterion of 0.1J / g. The test result is that the sample Contains semi-crystalline gum, which is consistent with the addition of semi-crystalline gum in the prepared sample.

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Abstract

The invention relates to a method for detecting a viscosity index improving agent containing hypocrystalline glue. The method comprises the following steps: separating dry glue from a viscosity index agent; placing a dry glue sample in a crucible, removing heat history under a DSC (Differential Scanning Calorimetry) mode; performing temperature rise scanning under an MDSC (Modulated Differential Scanning Calorimetry) mode and recording a curve; integrating a fusion endothermic peak in an interval of 40-60 DEG C on the curve and calculating a heat enthalpy value; judging whether the viscosity index contains the hypocrystalline glue according to the heat enthalpy value. The method has the characteristics of eliminating interference of factors such as sample viscosity, base oil variety and ethylene-propylene rubber batch, being capable of detecting a glue solution with a ratio of the hypocrystalline glue to an amorphous glue of 1:9 or even lower, and being high in sensitivity and reliability.

Description

technical field [0001] The invention relates to a method for detecting lubricating oil additives, in particular to a method for accurately detecting a viscosity index improver containing semi-crystalline glue. Background technique [0002] Ethylene-propylene copolymer viscosity index improver (hereinafter referred to as viscosity index agent) is currently the most widely used additive in the production of lubricating oil. It is formed by fully dissolving a certain proportion of ethylene propylene rubber in the base oil, which can increase the viscosity and increase the viscosity index in the oil. Ethylene-propylene rubber is divided into two types: amorphous rubber and semi-crystalline rubber. Usually, the ethylene content of semi-crystalline rubber is 65% or higher, while the ethylene content of amorphous rubber is between 45% and 55%. When the semi-crystalline gum has the same shear stability index as the amorphous gum, the former has a stronger thickening ability and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
Inventor 肖奇孙树好于军陆沁莹刘洋逄翠翠
Owner PETROCHINA CO LTD
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