Viscosity index improver and preparation method thereof

A viscosity index improvement, viscosity index technology, applied in the field of viscosity index improver and its preparation, can solve the problem of high energy consumption

Inactive Publication Date: 2019-11-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a viscosity index improver and its preparation method, in order to solve the problem of high energy consumption caused by high temperature in the preparation process of the existing ethylene-propylene copolymer viscosity index improver

Method used

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  • Viscosity index improver and preparation method thereof

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preparation example Construction

[0024] It can be seen from the background art that there is an urgent need to provide an ethylene-propylene rubber lubricating oil viscosity index improver with high thickening ability and low shear stability index in the prior art. The inventors of the present invention have conducted research on the above-mentioned problems and provided a preparation method of a viscosity index improver, which includes the following steps: S1, mixing a graft initiator, an acrylic compound, an ethylene-propylene rubber polymer and a solvent and performing grafting Branching reaction to obtain the first solution of ethylene-propylene copolymer grafted with acrylic compound; S2, mixing the first solution with amine compound and performing amination reaction to obtain a viscosity index improver.

[0025] The low-temperature stability, high-temperature thickening ability, and shear stability of the ethylene-propylene copolymer viscosity index improver product obtained by the above-mentioned prepar...

Embodiment 1

[0041] The initial temperature of ethylene-propylene polymer hexane solution in the present embodiment is between 15~25 ℃, and solid content is 4.0%, and the content of the molecular chain unit corresponding to ethylene is 48.5%, polymer Mooney viscosity (ML 1+4 100 ° C) was 6.0, the number average molecular weight of the polymer was 79,000, the weight average molecular weight was 158,000, and the relative molecular mass distribution was 2.00.

[0042] Get above-mentioned polymer hexane solution 0.6L and add in the reactor, add benzoyl peroxide and acrylic acid, the weight of acrylic acid is 1.0% of ethylene propylene rubber polymer weight, the weight of benzoyl peroxide is ethylene propylene rubber polymer 2.0% by weight, the stirring speed is 125r / min, the internal temperature of the reactor is 80℃~82℃, the pressure of the reactor is 0.115MPa~0.120MPa, after 4 hours of reaction, stop stirring, and slowly open the gas phase outlet valve for flash operation , the discharged g...

Embodiment 2

[0045] The difference between this embodiment and embodiment 1 is:

[0046] The solid content of the ethylene-propylene polymer hexane solution was 8.1%, and the solid content of the glue after flash evaporation was 12.0%.

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Abstract

The invention provides a viscosity index improver and a preparation method thereof. The preparation method of the viscosity index improver comprises the following steps: S1, mixing a grafting initiator, an acrylate compound, an ethylene propylene rubber polymer and a solvent and carrying out a grafting reaction to obtain a first solution which comprises an acrylic compound grafted ethylene-propylene copolymer; S2, mixing the first solution with an amine compound for amination to obtain the viscosity index improver. Since the acrylic compound is an organic acid and the amine compound is an organic amine, the two of which are prone to acid-base neutralization, the preparation process of the ethylene-propylene copolymer viscosity index improver can be carried out at a low temperature, and experiments prove that the ethylene-propylene copolymer viscosity index improver prepared by the preparation method can reach T-615 levels in low temperature stability, high temperature thickening capacity and shearing stability.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a viscosity index improver and a preparation method thereof. Background technique [0002] Viscosity index improvers, also known as viscosifiers, are mainly used in internal combustion engine oils, hydraulic oils, automatic transmission fluids and gear oils. In the scope of lubricating oil additives, their usage is second only to detergents and dispersants. The viscosity index improver is an oil-soluble chain polymer compound, which is soluble in the hydrocarbon base oil used for lubricants. At low temperature, the polymer coil of the viscosity index improver shrinks, which has little effect on the internal friction of the base oil. Therefore, the influence on the viscosity of the oil is relatively small; at high temperature, the polymer coil of the viscosity index improver swells and stretches, and the hydrodynamic volume and surface area increase, which significantly incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/04C08F8/32C10M133/54C10N30/02C10N30/08
CPCC08F8/32C08F255/04C10M133/54C10M2215/26C08F220/06
Inventor 王刚单振国郑翔金春玉王萍陶青海孙文秀王怀宇
Owner PETROCHINA CO LTD
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