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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.

Inactive Publication Date: 2013-11-06
FUYANG JINGLUE CHEM TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN1114683C discloses a lubricating oil viscosity index improver, which is a hydrogenated polyisoprene-polybutadiene-polyisoprene and a polystyrene tetrablock star polymer, the polymer in Although lubricating oil has higher viscosity at high temperature and high shear rate, and better low temperature performance, the viscosity increasing effect (viscosity index), shear stability (viscosity loss value, and low temperature performance) are not significantly improved compared with conventional polymers. For example, the Chinese The viscosity index of polymer 1 in Table 2 of the patent specification changes with time, and the viscosity loss and low-temperature cold start performance of polymers 1, 2, and 3 are not significantly improved compared with conventional polymers. Although the high-temperature high-shear rate viscosity is larger than that of conventional polymers, the high-temperature high-shear rate viscosity values ​​are smaller, and the low-temperature cold-start viscosity and low-temperature pumping performance are not significantly improved or even worse than conventional polymers
In addition, the star-shaped polymer is a tetrablock polymer. During the preparation process, monomers need to be added sequentially four times. The manufacturing process of the product is relatively complicated, and the requirements for the purity of the raw materials are also very high. If the raw materials contain impurities, oligomers are likely to be formed. Thus affecting the performance of the viscosity index improver

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

Examples

Experimental program
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Effect test

Embodiment 1

[0043] In this example, a star polymer with polystyrene block, hydrogenated isoprene block and hydrogenated butadiene block is prepared, the structure of which is (EP 1 ) n1 -X-(S-EB-EP 2 ) n2 , wherein the polymer solution concentration is 10% by weight. Polymer preparation methods include:

[0044] 1) Add 2250g of cyclohexane and 250g of isoprene into the 5L jacketed Reactor A that has been fully replaced by purified nitrogen, heat to 60°C, and then add 7.69mL of 0.5M normal The butyllithium cyclohexane solution was reacted for 60 minutes, and the maximum temperature during the polymerization reaction did not exceed 90°C to obtain an active polyisoprene block (I1-Li). After the isoprene polymerization was completed, the active polyisoprene The number average molecular weight (Mn) of the block (I1-Li) is 65000;

[0045] 2) Add 2,835g of cyclohexane and 250g of isoprene to a 10L jacketed reactor B that has been fully replaced with refined nitrogen, heat to 60°C, and add 1...

Embodiment 2

[0054] Basically repeat Example 1, except that the initiator for polymerization is sec-butyllithium, the starting temperature of the polymerization reaction in step 1) is 40°C, the reaction time is 120 minutes, the maximum temperature in the reaction process does not exceed 70°C, and the molecular weight of EP1 before hydrogenation is 30000; the initial temperature of the polymerization reaction of the isoprene segment in step (2) is 40°C, the reaction time is 120 minutes, the reaction time after adding butadiene and styrene is 120 minutes, and the maximum temperature during the reaction is not Over 80°C, the molecular weight of EP2 before hydrogenation is 20,000, the molecular weight of EB before hydrogenation is 3,000, the 1,4-structure content of polybutadiene block (B) is 88%, and the molecular weight of S is 3,000. The amount of divinylbenzene added was 4 moles of divinylbenzene per mole of active polymer. The catalyst used for hydrogenation is a mixture of nickel naphthe...

Embodiment 3

[0056] Basically repeat Example 1, except that the solvent for polymerization is n-hexane, the starting temperature of the polymerization reaction in step (1) is 70°C, the reaction time is 30 minutes, the maximum temperature during the reaction process does not exceed 110°C, and the molecular weight of EP1 before hydrogenation is 110,000 ; The initial temperature of the polymerization reaction of the isoprene segment in step (2) is 70°C, the reaction time is 30 minutes, the reaction time after adding butadiene and styrene is 60 minutes, and the maximum temperature during the reaction does not exceed 110 °C, the molecular weight of EP2 before hydrogenation was 80,000, the molecular weight of EB before hydrogenation was 6,000, the 1,4-structure content of the polybutadiene block (B) was 92%, and the molecular weight of S was 12,000. The catalyst used for hydrogenation is a mixture of nickel octoate and triisobutylaluminum, in which the molar ratio of Al / Ni is 6:1, the amount of c...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F297/04C08F136/08C08F8/00C08F8/04C10M143/12C10N30/02
Inventor 孙育成金莹孙经略
Owner FUYANG JINGLUE CHEM TECH
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