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A kind of asymmetric polystar polymer and its preparation method and application

A star-shaped polymer and polymer technology, applied in lubricating compositions, additives, petroleum industry, etc., can solve problems such as limited scope of application, poor high-temperature thickening ability, etc.

Inactive Publication Date: 2019-11-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide an asymmetric multi-star polymer to solve the problems of poor high-temperature thickening ability and limited application range of the existing asymmetric multi-star polymer used in lubricating oil viscosity index improvers. Polymers and their preparation methods and applications

Method used

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  • A kind of asymmetric polystar polymer and its preparation method and application
  • A kind of asymmetric polystar polymer and its preparation method and application

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preparation example Construction

[0025] The present invention also provides a method for preparing an asymmetric multi-star polymer, the method comprising:

[0026] Step 1: In an organic solvent, butyllithium is used as an initiator to initiate the polymerization of isoprene, and then divinylbenzene is added to obtain the active star polymer S1;

[0027] Step 2: In an organic solvent, butyllithium is used as an initiator to initiate the polymerization of butadiene or isoprene, and then add divinylbenzene to obtain the active star polymer S2;

[0028] Step 3: Mix the active star-shaped polymer S1 obtained in step 1 and the active star-shaped polymer S2 obtained in step 2, and then add a coupling agent for reaction to obtain an asymmetric multi-star polymer.

[0029] According to the present invention, in an organic solvent, butyllithium is used as an initiator to initiate the polymerization of isoprene, and then divinylbenzene is added as a coupling agent to continue the reaction. The reaction temperature is p...

Embodiment 1

[0036] In a 100mL flask, under the heating condition of a gas lamp, evacuate and replace with nitrogen for three times to remove impurities such as water and oxygen in the system, and finally cool to room temperature under nitrogen, add 50mL of toluene refined by sodium reflux and distilled refined Isoprene 5mL, refined tetrahydrofuran 0.5mL, n-butyl lithium 0.2ml (1.6mol / L), reaction temperature 50°C, react for 4 hours, then add divinylbenzene 0.2mL, continue to react for 3 hours to obtain active star type polymer S1;

[0037]Another 100mL flask was heated by a gas lamp, vacuumed and replaced with nitrogen for three times to remove impurities such as water and oxygen in the system, and finally cooled to room temperature under nitrogen, and added 50mL of toluene refined by sodium reflux and refined by distillation. 3mL of isoprene, 0.5mL of refined tetrahydrofuran, 0.5ml of n-butyl lithium (1.6mol / L), reaction temperature 50°C, react for 4 hours, then add 0.2mL of divinylbenze...

Embodiment 2

[0042] In a 100mL flask, under the heating condition of a gas lamp, evacuate and replace with nitrogen for three times to remove impurities such as water and oxygen in the system, and finally cool to room temperature under nitrogen, add 50mL of toluene refined by sodium reflux and distilled refined 5mL of isoprene, 0.5mL of refined tetrahydrofuran, 0.25mL of n-butyl lithium (1.6mol / L), reaction temperature 50°C, react for 4 hours, then add 0.2mL of divinylbenzene, continue to react for 3 hours to obtain active star type polymer S1;

[0043] Another 100mL flask was heated by a gas lamp, vacuumed and replaced with nitrogen for three times to remove impurities such as water and oxygen in the system, and finally cooled to room temperature under nitrogen, and added 50mL of toluene refined by sodium reflux and refined by distillation. Butadiene 3mL, refined tetrahydrofuran 0.5mL, n-butyllithium 0.6mL (0.2mol / L), reaction temperature 50°C, react for 4 hours, then add divinylbenzene 0...

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Abstract

The invention provides an asymmetrical poly star polymer as well as a preparation method and application thereof, and belongs to the field of a high-molecular polymer. The polymer has a structural general formula of (S1)nT(S2)m, wherein S1 is X1-(EP)a; X1 is polydivinylbenzene cores; EP is polyisoprene arms; a is the arm number; the value range of the a is 3 to 20; S2 is X2-(EB)b; the X2 is polydivinylbenzene cores; EB is polybutadiene arms or the polyisoprene arms; b is the arm number; the value range of the b is 3 to 20; the m and the n are positive integers; the value ranges of the m and the n are both 1 to 20; T is a coupling agent. The invention also provides a preparation method of the asymmetrical poly star polymer. The invention also provides application of the asymmetrical poly star polymer as a lubricating oil viscosity index improving agent. The low-temperature performance is ensured; meanwhile, the high-temperature thickening capability of a viscosity index agent is furtherimproved; the use range is wide; the application to various kinds of basic oil can be realized.

Description

technical field [0001] The invention belongs to the field of high-molecular polymers, and in particular relates to an asymmetric multi-star polymer and its preparation method and application. Background technique [0002] With the rapid development of the machinery industry, higher and higher requirements are put forward for the performance of lubricating oil. As an additive to improve the viscosity-temperature performance of lubricating oil, lubricating oil viscosity indicator (viscosity index agent) can make lubricating oil play a role in various complex environments, thereby improving the reliability and service life of mechanical operation. At present, ethylene-propylene copolymer (OCP) is mainly used in the market, which is mainly due to its readily available raw materials and relatively simple synthesis process. Although the thickening ability of ethylene-propylene copolymer is good, its shear stability and low temperature performance are poor, especially the low temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F301/00C08F2/26C10M143/12C10N30/02
CPCC08F2/26C08F301/00C10M143/12C10M2205/04C10M2205/06C10N2030/02C10N2020/073
Inventor 周光远聂赫然苏小龙张丽黄河张文铎
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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