Star polymer used as lubricating oil viscosity index improver, preparation method and application thereof

A star-shaped polymer and lubricating oil composition technology, applied in lubricating compositions, additives, petroleum industry, etc., can solve the problem of viscosity increasing effect, namely viscosity index, shear stability, i.e. viscosity loss value, low temperature performance is not significantly improved, Low temperature cold start viscosity and low temperature pumping performance are not significantly improved, viscosity loss and low temperature cold start performance are not significantly improved, etc., to achieve excellent viscosity increasing effect, excellent shear stability, low temperature pumping performance and low temperature start performance.
CN102731739BInactive Publication Date: 2013-11-06FUYANG JINGLUE CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FUYANG JINGLUE CHEM TECH
Publication Date
2013-11-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a star polymer used as a lubricating oil viscosity index improver, a preparation method of the star polymer and application of the star polymer. The star polymer has asymmetrical arms and consists of two different types of polymer arms, wherein the first type of polymer arm is a hydrogenation polyisoprene homopolymer, and the second type of polymer arm is a copolymer in a hydrogenation polyisoprene-hydrogenation polybutadiene-polystyrene block structure; and in the copolymer arm, the polystyrene section is close to the core of the star polymer, the hydrogenation polybutadiene section is in the middle of the arm, and the hydrogenation isoprene section is outside the arm. The structure of the star polymer contains 2-15% of polybutadiene block by weight, and at least a part of the polyisoprene block and the polybutadiene block in the structure of the start polymer is hydrogenated. The star polymer has an excellent tackifying effect and excellent shear resistance stability, and is lower in pumping viscosity and low-temperature start viscosity during blending of thickened engine oil, and crystal or gel cannot be formed in the engine oil by the star polymer.
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Description

technical field

[0001] The invention relates to a star polymer used as a lubricating oil viscosity index improver, its preparation method and application. Background technique

[0002] Viscosity index improver (viscosity index improver, referred to as VII) is one of the important additives of lubricating oil, currently widely used viscosity index improver includes four categories: polymethacrylate (PMA), polyisobutylene (PIB), Ethylene-propylene copolymer (OCP) and hydrogenated styrene-diene copolymer (HSD), among which HSD has linear and star polymers, and the other VIIs are linear polymers. In order to meet the different needs of multi-grade oil, aviation hydraulic oil, gear oil, automatic transmission oil, etc., it is necessary to choose viscosity index improvers with different structures. The lightweight and miniaturization of modern automobiles requires lubricating oils to still have good performance under high temperature and high shear conditions. Although the thicke...

Claims

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