A kind of hydrogenated styrene diene copolymer viscosity index improver and preparation method thereof

A viscosity index improvement, diene copolymer technology, applied in additives, lubricating compositions, petroleum industry, etc., can solve problems such as difficult control of graft ratio and functionalization degree, easy coupling and degradation, and affecting product performance. , to achieve the effect of easy control of product structure, improved soot dispersion, low probability of cross-linking and degradation

Active Publication Date: 2018-11-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis processes of the above two viscosity index improvers have the same defect, that is, they both include a free radical reaction process and a condensation reaction process, both of which require high temperatures (free radical reaction: 140°C; condensation reaction: 180-250°C) , thus increasing energy consumption, side reactions such as coupling and degradation are also prone to occur under high temperature conditions, seriously affecting the performance of the product
In addition, the grafting rate and the degree of functionalization are difficult to control, and the reproducibility of the reaction is poor

Method used

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  • A kind of hydrogenated styrene diene copolymer viscosity index improver and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Dissolve 1.62g of butadiene in 61.0g of toluene through gasification absorption, store in the reactor, then add 18.1g of isoprene to the reactor, mix well; add diglyme and sec-butyl Lithium (the molar ratio of diethylene glycol dimethyl ether to sec-butyllithium is 1:5), the amount of sec-butyllithium added is 1.0mmol, and the reaction temperature is 70°C; when the monomer conversion rate exceeds 95% 0.4 g of styrene was added to the reactor to continue the reaction for 60 minutes, at which point the molecular weight of the polymer was 20600. Raise the temperature of the reactor to 90° C., add 3.0 mmol of divinylbenzene into the reactor at one time, and after 60 minutes of coupling reaction, add 0.1 g of 2-vinylpyridine into the reaction system for 30 minutes to react. After the reaction was completed, 1.0 mmol of isopropanol was added to the reaction system to terminate the reaction.

[0030] The above-mentioned solution is transferred in the hydrogenation reactor, and...

Embodiment 2

[0035] 3.1g of butadiene is dissolved in 180.2g of cyclohexane by gasification absorption, stored in the reactor, then 14.9g of isoprene is added to the reactor, and mixed uniformly; add tetrahydrofuran and n-butyllithium (tetrahydrofuran and The molar ratio of n-butyllithium is 5:1), the addition of n-butyllithium is 0.4mmol, and the reaction temperature is 60°C; when the monomer conversion exceeds 95%, add 2.1g styrene to the reactor to continue After 60 minutes of reaction, the molecular weight of the polymer was 49800. Add 3.0 mmol of divinylbenzene into the reactor, feed continuously, and the feeding is completed within 30 minutes. After 60 minutes of coupling reaction, 0.2 g of 4-vinylpyridine is added into the reaction system for 30 minutes to react. After the reaction was completed, 0.4 mmol of isopropanol was added to the reaction system to terminate the reaction.

[0036] The above-mentioned solution is transferred in the hydrogenation reactor, and 2-ethylhexanoic a...

Embodiment 3

[0039] Dissolve 12.0g of butadiene in 180.0g of n-hexane through gasification absorption, store in the reactor, then add 6.9g of isoprene into the reactor, mix well; add tetramethylethylenediamine and sec-butyl base lithium (the molar ratio of tetramethylethylenediamine to sec-butyllithium is 2:1), the addition of sec-butyllithium is 1.0mmol, and the reaction temperature is 50°C; when the monomer conversion rate exceeds 95%, 1.1 g of styrene was added to the reactor and the reaction was continued for 60 minutes. At this time, the molecular weight of the polymer was 19800. Add 20.0mmol of divinylbenzene into the reactor in four times, 5.0mmol each time, with an interval of 20 minutes between each addition, and then react for 60 minutes after the addition, and add 0.16g of 2-vinylpyridine into the reaction system to react 30 minutes. After the reaction was completed, 1.0 mmol of isopropanol was added to the reaction system to terminate the reaction.

[0040] The above-mentione...

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Abstract

The invention relates to a viscosity index improver for a hydrogenated styrene-diene copolymer and a preparation method thereof. The copolymer is a hydrogenated star polymer; and at least 95% of the unsaturated double bonds of diolefin are hydrogenated, and at most 10% of the unsaturated bonds of aromatic hydrocarbon are hydrogenated. The polymer has the following characteristics before hydrogenation: the core of the polymer is a poly(divinylbenzene) residue; the arms of the polymer are two-block copolymers, and a block I is an isoprene-butadiene copolymer while a block II is polystyrene; the number of the arms is 3; single-arm molecular weight is 20, 000 to 100, 000; and the contents of polystyrene, polyisoprene and polybutadiene by mass are 2 to 15%, 30 to 90% and 5 to 60%, respectively. The improver has excellent thickening capability, shearing stability and soot dispersibility.

Description

technical field [0001] The invention relates to an oil-soluble polymer which can be used as a viscosity index improver, especially the polymer has the properties of a viscosity index improver and a dispersant. Background technique [0002] With the advancement of automobile engine technology, the requirements for engine oil are becoming more and more stringent. Especially with the adoption of some new technologies, such as fuel delayed injection technology, turbocharging technology, exhaust gas recirculation technology, etc., more and more soot will be produced during the combustion process of fuel. The lubricating effect of the oil will deteriorate rapidly, resulting in a significant reduction in the service life of the oil, which not only increases the burden on consumers, but may also cause damage to the engine in severe cases. There are usually two ways to solve the above problems: one is to add a dispersant to the engine oil to disperse the soot; the other is to add an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F297/04C08F8/04C08F8/30C10M143/12C10N30/02
Inventor 张雪涛于军张东恒魏观为
Owner PETROCHINA CO LTD
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