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Lubricating oil viscosity index improver and preparation thereof

A technology for improving viscosity index and lubricating oil, which is applied in lubricating compositions, additives, petroleum industry, etc. It can solve the problem of decreased shear stability and achieve good thickening ability, good compatibility, and excellent shear stability sexual effect

Active Publication Date: 2009-05-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to ensure the thickening ability, it is necessary to increase the molecular weight of the polymer, which reduces the shear stability of the product

Method used

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  • Lubricating oil viscosity index improver and preparation thereof
  • Lubricating oil viscosity index improver and preparation thereof
  • Lubricating oil viscosity index improver and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: 3500 milliliters of pure cyclohexane, 5.5 milliliters of tetrahydrofuran, and 6.4 mmol of n-butyllithium were added to a 10-liter polymerization kettle replaced with pure nitrogen, and the temperature was raised to 60 ° C under stirring, and then 56 g of styrene and 224g of butadiene monomer mixture is continuously added to the polymerization tank, the feeding time is controlled to be 45-75 minutes, the polymerization temperature is 60-85°C, and the monomers are added and then reacted for 0-15 minutes, and then 13.4mmol of diethylene is added Benzene is used for coupling reaction, the temperature of the coupling reaction is controlled at 60-85°C, and the coupling reaction time is 30-60 minutes. After the coupling reaction is completed, the glue is introduced into the hydrogenation tank, and dimethyl phthalate is used as a cocatalyst Dicyclopentadiene titanium dichloride is the main catalyst, and the hydrogenation reaction is carried out under the conditions of...

Embodiment 2

[0052] Embodiment 2: The preparation process is the same as in Example 1, changing the addition amount of initiator n-butyllithium to synthesize polymers with different single-arm molecular weights, and keeping the molar ratio of n-butyllithium and divinylbenzene in the coupling reaction as 2.2. The experimental results are shown in Table 1.

[0053] Table 1 Results of polymer modified lubricating oils with different single-arm molecular weights

[0054]

Embodiment 3

[0055] Example 3: The preparation process is the same as in Example 1, but the ratio of styrene and butadiene is changed to synthesize polymers with different styrene contents. The experimental results are shown in Table 2.

[0056] Table 2 Results of polymer modified lubricating oils with different styrene contents

[0057]

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Abstract

The invention provides a lubricating oil viscosity index improver and a preparation method thereof; the lubricating oil viscosity index improver has stable chemical performance, oxidation resistance, shear resistance and good compatibility with lubricating oil; in addition to good thickening ability to the lubricating oil, the lubricating oil viscosity index improver further has excellent anti-shear stability and viscosity-temperature performance. The viscosity index of the lubricating oil after modification is greater than 150, and low-temperature kinematic viscosity is less than 1600mpa.s. The lubricating oil viscosity index improver can not only be used for preparing multi-level lubricating oil, but also be used for improving the viscosity index of base oil of the lubricating oil with the low viscosity index, thereby having broad application prospects.

Description

technical field [0001] The invention relates to a lubricating oil viscosity index improver and a preparation method thereof. Background technique [0002] Viscosity index improver (VII), also known as tackifier or viscosity agent, is an important additive added to improve the viscosity-temperature performance of lubricating oil. Viscosity index improvers are oil-soluble chain polymers with molecular weights ranging from tens of thousands to millions. Viscosity index improvers are dissolved in lubricating oil, and they exist in the form of silk rolls at low temperatures, which have little effect on the viscosity of lubricating oil. The resistance increases, resulting in a relatively significant increase in the viscosity of the lubricating oil. Since the viscosity index improver has different forms at different temperatures and has different effects on the viscosity, it can increase the viscosity and improve the viscosity-temperature performance, so the viscosity index impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M143/10C08F297/04C08F8/04C10N30/02
Inventor 邬智勇余磊梁红文李望明李万英张君花朱和菊
Owner CHINA PETROLEUM & CHEM CORP
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