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Catalyst composition for long-chain α-olefin polymerization and method for catalyzing long-chain α-olefin polymerization

A technology of olefin polymerization and catalyst, which is applied in the field of olefin polymerization catalysts, and can solve the problems of poor thermal stability and high molecular weight of catalyzed long-chain α-olefins

Active Publication Date: 2020-12-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a catalyst combination for the polymerization of long-chain α-olefins in view of the technical deficiencies such as the poor thermal stability of the existing α-diimine nickel metal catalyst and the high molecular weight of catalyzed long-chain α-olefins The compound and its method for catalyzing the polymerization of long-chain α-olefins enable the catalyst composition to have high catalytic activity and good thermal stability when catalyzing the chain transfer polymerization of α-olefins, and are used for synthesizing products with narrow molecular weight distribution and controllable molecular weight. polyalphaolefin

Method used

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  • Catalyst composition for long-chain α-olefin polymerization and method for catalyzing long-chain α-olefin polymerization
  • Catalyst composition for long-chain α-olefin polymerization and method for catalyzing long-chain α-olefin polymerization
  • Catalyst composition for long-chain α-olefin polymerization and method for catalyzing long-chain α-olefin polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Vacuumize the 100ml three-necked reaction flask, replace it with nitrogen three times, add 7.2mg (10μmol) complex 3, 15ml 1-decene, 0.8ml methylaluminoxane (MAO) (1.53mol / l toluene solution) , 0.5ml of diethylzinc (1.0mol / l toluene solution), the polymerization reaction stopped after 2 hours at 60°C, and the reaction system was black and viscous. Terminate the reaction with dilute hydrochloric acid-ethanol solution, dissolve the obtained polymer in tetrahydrofuran, precipitate in methanol, repeat this process three times, and finally put the sample in a vacuum drying oven for 24 hours to obtain 1.67g of a white solid polymer with certain elasticity . The catalytic efficiency of the catalytic system is 167kg mol -1 Ni, the weight-average molecular weight of the polymer measured at the end of the reaction was Mw=169,800, and the molecular weight distribution Mw / Mn=2.31.

Embodiment 2

[0058] Vacuumize the 100ml three-necked reaction flask, replace it with nitrogen three times, add 7.2mg (10μmol) complex 3, 15ml 1-decene, 0.8ml methylaluminoxane (MAO) (1.53mol / l toluene solution) , 1.0ml of diethylzinc (1.0mol / l toluene solution), the polymerization reaction stopped after 2 hours at 60°C, and the reaction system was black and viscous. The reaction was terminated with dilute hydrochloric acid-ethanol solution, the obtained polymer was dissolved in tetrahydrofuran, and methanol was precipitated. This was repeated three times. Finally, the sample was dried in a vacuum oven for 24 hours to obtain 1.82 g of a polymer with certain elasticity. The catalytic efficiency of the catalytic system is 182kgmol -1 Ni, the weight-average molecular weight of the polymer measured at the end of the reaction was Mw=108,800, and the molecular weight distribution Mw / Mn=2.06.

Embodiment 3

[0060] Vacuumize the 100ml three-necked reaction flask, replace it with nitrogen three times, add 7.2mg (10μmol) complex 3, 15ml 1-decene, 0.8ml methylaluminoxane (MAO) (1.53mol / l toluene solution) , 2.0ml of diethylzinc (1.0mol / l toluene solution), the polymerization reaction stopped after 2 hours at 60°C, and the reaction system was black and viscous. The reaction was terminated with dilute hydrochloric acid-ethanol solution, the obtained polymer was dissolved in tetrahydrofuran, and methanol was precipitated. This was repeated three times. Finally, the sample was dried in a vacuum oven for 24 hours to obtain 1.04 g of a polymer with certain elasticity. The catalytic efficiency of the catalytic system is 104kgmol -1 Ni, the weight-average molecular weight of the polymer measured at the end of the reaction was Mw=52,400, and the molecular weight distribution Mw / Mn=1.87.

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Abstract

The invention provides catalyst composition for long-chain alpha-olefin polymerization and a method for catalyzing long-chain alpha-olefin polymerization by the catalyst composition. The catalyst composition contains a main catalyst, a catalyst promoter and a chain transfer agent, wherein the main catalyst is a complex with the chemical structure shown in the description, R<1>-R<10> are the same or different and are independently selected from hydrogen, saturated or unsaturated alkyl, alkoxy or halogen, and X is selected from halogen; the catalyst promoter is selected from at least one of alkylaluminoxane, aromatic boron and borate; the chain transfer agent is selected from trialkylaluminium and / or dialkylzinc. The method for catalyzing long-chain alpha-olefin polymerization by the catalyst composition comprises the step as follows: long-chain alpha-olefin, the main catalyst, the catalyst promoter and the chain transfer agent are contacted for the polymerization reaction in the presence of inert gas. When catalyzing chain-transfer polymerization of alpha-olefin, the catalyst composition has higher catalytic activity and good heat stability and is used for synthesizing poly alpha-olefin with controllable molecular weight.

Description

technical field [0001] The present invention relates to the technical field of catalysts for olefin polymerization, and more specifically, to a catalyst composition for chain transfer polymerization of long-chain α-olefins and a method for catalyzing the polymerization of long-chain α-olefins. Background technique [0002] Poly-α-olefin synthetic oil (PAO) is a high-purity oil produced by oligomerization and hydrogenation saturation of α-olefins under the action of a catalyst. Compared with mineral oil, PAO has the characteristics of high viscosity index, low pour point, high flash point and excellent high and low temperature performance, and it is still irreplaceable in many oil products. A significant issue in the preparation of α-olefin synthetic oils is to explore ways to control the viscosity index of polyα-olefins, that is, to control the molecular weight and distribution of polyα-olefins. [0003] Single-site polyolefin catalysts can well control the microstructure o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/14C08F110/14C08F4/70C08F2/38
CPCC08F10/14C08F110/14C08F4/7006C08F2/38C08F2500/03
Inventor 高榕赖菁菁李岩刘东兵郭子芳周俊领廖浩瀚黄廷杰
Owner CHINA PETROLEUM & CHEM CORP
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