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Lubricating-oil viscosity index improver and preparation method thereof

A technology for improving viscosity index and lubricating oil, used in lubricating compositions, additives, petroleum industry, etc., can solve the problems of narrow molecular weight distribution, poor low temperature fluidity, low viscosity index, etc., and achieve high shear stability and oxidation resistance. Increase, the effect of excellent low temperature fluidity

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The present invention aims at the problems of low viscosity index and poor low-temperature fluidity of the lubricating oil modified by the styrene-butadiene viscosity index improver in the prior art, and aims to provide a hydrogenated polymer with narrow molecular weight distribution, complex structure and good chemical stability. Isoprene-b-polybutadiene-b-polystyrene triblock copolymer, the lubricating oil modified by the copolymer has strong thickening ability, high shear stability and good oxidation stability and excellent low temperature fluidity

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 3000ml of pure cyclohexane (water value2 o 2 Oxidize the glue, stir and react for 30 minutes, then wash with 50mL citric acid, centrifuge, stand still, separate the water to remove the heavy metal ions in the glue, and condense the water vapor of the glue after removing the metal ions to obtain the viscosity index of lubricating oil Improver.

[0042] Add lubricating oil viscosity index improver to 150SN neutral wax-based lubricating oil at a mass fraction of 1%, test its kinematic viscosity at 40°C and 100°C with an automatic capillary viscometer, and measure it with a diesel nozzle shear stability index meter The shear stability index (SSI) of oil products, and the pour point of petroleum products are measured with a pour point apparatus for freezing point.

[0043] The test results are as follows:

[0044] GPC analysis results: the number average molecular weight of the polymer is 138,000, and the molecular weight distribution is 1.06;

[0045] HNMR analysis r...

Embodiment 2

[0066] The preparation process is the same as that in Example 1, and the addition amount of initiator n-butyllithium is changed to synthesize viscosity index modifiers with different molecular weights, which are used for the modification of lubricating oil. The experimental results are shown in Table 1:

[0067] Table 1 Performance Test Results of Viscosity Index Improvers Modified Lubricating Oils with Different Molecular Weights

[0068]

Embodiment 3

[0070] The preparation process is the same as in Example 1, changing the ratio of diene and styrene to synthesize viscosity index modifiers with different styrene contents, which are used to modify lubricating oil. The experimental results are shown in Table 3:

[0071] Table 3 Performance Test Results of Viscosity Index Improver Modified Lubricating Oils with Different Styrene Contents

[0072]

[0073]

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Abstract

The invention discloses a lubricating-oil viscosity index improver and a preparation method thereof. The lubricating-oil viscosity index improver is obtained by performing hydrogenation modification on a polyisoprene-b-polybutadiene-b-polystyrene triblock copolymer. The preparation method comprises, adding an adjusting agent into a polymerization reaction kettle with the temperature of 60-70 DEG C and the pressure of 0.1-0.5 MPa, and then successively adding an isoprene monomer, a butadiene monomer and a styrene monomer for polymerization reaction; and obtaining the polyisoprene-b-polybutadiene-b-polystyrene triblock copolymer after the polymerization reaction is finished, and performing hydrogenation reaction on the obtained triblock copolymer, so as to obtain the lubricating-oil viscosity index improver. The preparation method is rapid and convenient in operation and simple in process, and the prepared hydrogenated polyisoprene-b-polybutadiene-b-polystyrene triblock copolymer is narrow in molecular weight distribution, complex in structure and good in chemical stability. Lubricating oil modified by the copolymer possesses the characteristics of strong thickening capability, high shearing stability, good oil-product oxidation stability and excellent low-temperature fluidity, and has wide application prospect.

Description

technical field [0001] The invention relates to a lubricating oil viscosity index improver and a preparation method thereof, which belong to the field of modification of viscosifiers. Background technique [0002] Lubricating oil is one of the effective substances to reduce machine friction and wear. When the machine is in operation, the viscosity of lubricating oil will decrease with the rise of temperature. The most commonly used method to indicate the trend of viscosity change with temperature is viscosity index (VII). Calculate the viscosity index of lubricating oil according to the method of GB / T1995-88. Viscosity The larger the index, the smaller the viscosity change with temperature. In order to ensure the normal operation of the equipment, simply using pure base oil as lubricating oil can no longer meet the actual needs, and it is necessary to add a series of additives to make lubricating oil with better performance. Lubricating oil additives are divided into two c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M143/12C08F236/08C08F236/06C08F212/08C08F8/04C10N20/02C10N30/10
Inventor 梁红文莫笑君彭红丽严绍敏文强邱为
Owner CHINA PETROLEUM & CHEM CORP
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