Star-shaped hydrogenated styrene diene copolymer and preparation method thereof

A hydrogenated styrene and copolymer technology, applied in lubricating compositions, additives, petroleum industry, etc., can solve the problems of poor shear stability, poor dissolution, poor low temperature performance, etc., and achieve improved processing performance and thickening effect Good, the effect of improving processing performance

Active Publication Date: 2016-07-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the presence of double bonds, the star-shaped isoprene-b-butadiene styrene terpolymer in CN103382241A has poor chain flexibility and poor solubility in base oil, so that the star in CN103382241A The thickening ability of shaped isoprene-b-butadiene styrene terpolymer is relatively poor; In addition, due to the existence of double bonds, star-shaped isoprene-b-butadiene styrene The shear stability of the meta-copolymer is also poor; similarly, the presence of double bonds also makes the polymer relatively rigid, and its viscosity increases rapidly at low temperature, and its low-temperature performance is poor.

Method used

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  • Star-shaped hydrogenated styrene diene copolymer and preparation method thereof
  • Star-shaped hydrogenated styrene diene copolymer and preparation method thereof
  • Star-shaped hydrogenated styrene diene copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The star-shaped hydrogenated styrene diene copolymer prepared in this embodiment has a structural formula of (EP-SEB)n-C, and the preparation method is as follows:

[0036] 1) Add 180.0 g of refined cyclohexane and 15.0 g of refined isoprene to a 500 ml glass reaction bottle with magnetic stirring after three times of vacuuming and argon gas circulation, and add 180.0 g of refined cyclohexane and 15.0 g of refined isoprene. 0.4ml of n-butyl lithium with a concentration of 1.0M in n-hexane was reacted for 60 minutes, then 0.145g of tetrahydrofuran (THF), 2.0g of refined styrene and 3.0g of refined butadiene were added, and the reaction was continued for 60 minutes to obtain an active amphibolite segment (PI-SPB-Li).

[0037] 2) Add metered divinylbenzene ([DVB] / [Li]=3.0) to the reaction flask to couple the active block polymer chains, add metered isopropanol after 60 minutes of coupling reaction, isopropanol The molar ratio of alcohol to active lithium is 1:1, and then ...

Embodiment 2

[0045] Repeat Example 1, the mass of added monomers is respectively: 18g of isoprene, 0.4g of styrene, and 1.6g of butadiene; the polymerization temperature is 70°C, the reaction time is 90 minutes, and the initiator is sec-butyl Lithium base, the addition is 1mmol; the polar regulator is diethylene glycol dimethyl ether (2G), the addition is 0.2mmol; the coupling agent is silicon hexachloride, the addition is 1 / 6mmol, and the reaction temperature is 20°C, the reaction time is 180 minutes; the hydrogenation reaction catalyst is nickel naphthenate and triisobutylaluminum, the nickel addition is 2.0mg / g polymer, the Al / Ni molar ratio is 2:1, and the hydrogenation reaction temperature is 90 °C, the hydrogen pressure is 6.0MPa.

[0046] The structure and performance test results of the copolymer are shown in Table 1, and the performance test results of the copolymer as a viscosity index improver are shown in Table 2.

Embodiment 3

[0048] Repeat Example 1, the quality of added monomers is respectively: isoprene is 6.0g, styrene is 3.0g, butadiene is 11.0g; initiator addition is 0.2mmol, no polar additives are added, and the polymerization temperature is 50°C, the reaction time is 120 minutes, the amount of coupling agent added is 0.1mmol, the reaction temperature is 90°C, the reaction time is 30 minutes; the hydrogenation reaction temperature is 40°C, the catalyst is nickel naphthenate and triisobutylaluminum, The amount of nickel added is 20.0mg / g polymer, the molar ratio of Al / Ni is 3:1, the hydrogen pressure is 0.5MPa, and the reaction is carried out for 8 hours.

[0049] The structure and performance test results of the copolymer are shown in Table 1, and the performance test results of the copolymer as a viscosity index improver are shown in Table 2.

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Abstract

The invention relates to a star-shaped hydrogenated styrene diene copolymer which is used as a lubricating oil viscosity index improver. Each arm of the star-shaped hydrogenated styrene diene copolymer is a diblock copolymer including a block I being hydrogenated polyisoprene (EP) and a block II being and a block II being hydrogenated styrene-butadiene copolymer (SEB), and has a structural formula being (EP-SEB)n-C, wherein C is a core of a coupling agent, and n is the arm number of the copolymer and is no less than 3. The star-shaped hydrogenated styrene diene copolymer is finally prepared through polymerization, coupling, and hydrogenation. A novel copolymer is prepared through adjustment of numbers, ratio, and addition sequence of monomers in the arms of the copolymer and a microstructure. The copolymer is applied to a lubricating oil composition, and the thickening capacity, shear stability, low-temperature performance, and processing ability of lubricating oil are obviously improved. Meanwhile, the preparation method is simple and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of preparation of lubricating oil additives, and relates to a star-shaped hydrogenated styrene diene copolymer used as a viscosity index improver of lubricating oil and a preparation method thereof. Background technique [0002] Viscosity index improver (VII), also known as viscosifier, is mainly used in internal combustion engine oil, hydraulic oil, automatic transmission fluid and gear oil. The viscosity index improver can not only thicken the base oil, improve the viscosity-temperature performance of the oil, make the oil have good high-temperature lubricity and low-temperature fluidity, but also reduce the consumption of fuel and lubricating oil, and realize the generalization of the oil. According to data, in the global viscosity index improver market, ethylene-propylene copolymer occupies the largest share in the world market, which is 39%, and the second place is polymethacrylate, which is 29%. Shell ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/04C08F8/04C08F8/00C08F8/42C10M143/12C10N30/02
Inventor 张雪涛张东恒魏观为
Owner PETROCHINA CO LTD
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