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Ziegler-Natta olefin polymerization catalysts with single-site center property

A single active site, olefin polymerization technology, applied in the field of Ziegler-Natta olefin polymerization catalysts, can solve the problems of a large number of co-catalysts, low stability of the main catalyst, and difficult synthesis

Active Publication Date: 2010-08-11
SHANGHAI INST OF ORGANIC CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development and application of these new catalysts are greatly restricted due to the low stability of the main catalyst, difficulty in synthesis, difficulty in storage, need for a large amount of expensive co-catalysts, and difficulty in operating on current polymerization process devices.
[0004] Utilizing Ziegler-Natta catalysts to control the structure and properties of polymers, and obtaining polymers with narrow molecular weight distribution (1.6-3.8) and uniform comonomer distribution with high activity have not been reported yet.

Method used

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  • Ziegler-Natta olefin polymerization catalysts with single-site center property
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  • Ziegler-Natta olefin polymerization catalysts with single-site center property

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Experimental program
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Effect test

Embodiment 1

[0066] The preparation of embodiment 1 catalyst 1:

[0067] (1) Heat treatment of the carrier

[0068] Get ES70 type silica gel (product of PQ company) and bake under nitrogen atmosphere. The calcination conditions are as follows: treat at 200°C for 2 hours, then raise the temperature to 400°C for 2 hours, then treat at 600°C for 4 hours, and cool naturally under nitrogen atmosphere. Denoted as ES70 vector.

[0069] (2) The electron donor is:

[0070]

[0071] Add 1.0g of anhydrous magnesium chloride to 40mL of tetrahydrofuran (hereinafter referred to as THF), stir at 60°C for 2h; add dropwise 3.4mmol of TiCl 4, reacted at 60°C for 4h, then added 1.0g of ES70 carrier after heat treatment, reacted at 60°C for 4h; finally added 4.0mmol of electron donor L1 prepared above, reacted at 60°C for 12h. After the reaction, the solvent was evaporated under reduced pressure, and the product was washed with hexane (3×20 mL), and then dried under reduced pressure to obtain Catalyst ...

Embodiment 2

[0072] The preparation of embodiment 2 catalyst 2

[0073] The electron donor is:

[0074]

[0075] Add 1.0g of anhydrous magnesium chloride to 40mL of tetrahydrofuran (hereinafter referred to as THF), stir at 60°C for 2h; add dropwise 3.4mmol of TiCl 4 , reacted at 60°C for 4h, then added 1.0g of ES70 carrier after heat treatment, reacted at 60°C for 4h; finally added 4.0mmol of electron donor L2 prepared above, reacted at 60°C for 12h. After the reaction, the solvent was evaporated under reduced pressure, and the product was washed with hexane (3×20 mL), and then dried under reduced pressure to obtain catalyst 2. Ti content: 2.81wt-%

Embodiment 3

[0076] The preparation of embodiment 3 catalyst 3

[0077] The electron donor is:

[0078] Add 1.0g of anhydrous magnesium chloride to 40mL of tetrahydrofuran (hereinafter referred to as THF), stir at 60°C for 2h; add dropwise 3.4mmol of TiCl 4 , reacted at 60°C for 4h, then added 1.0g of the above heat-treated ES70 carrier, reacted at 60°C for 4h; finally added 4.0mmol of the electron donor L3 prepared above, and reacted at 60°C for 12h. After the reaction, the solvent was evaporated under reduced pressure, and the product was washed with hexane (3×20 mL), and then dried under reduced pressure to obtain catalyst 3 with a Ti content of 3.57 wt-%.

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Abstract

The invention relates to novel Ziegler-Natta olefin polymerization catalysts with single-site center property. The catalysts are characterized in that the catalysts are obtained by adopting a one-pot method and adding novel multidentate ligands (I), magnesium compounds, metal compounds and carriers to tetrahydrofuran solution for treatment. Under the action of alkylaluminium or alkylaluminoxane and other cocatalysts, the catalysts can obtain ethylene copolymer and homopolymer products with controllable molecular weight distribution (1.6-40) and uniformly distributed comonomers through high activity. The catalysts can realize catalytic ethylene polymerization, as well as the slurry-process or gas-phase-process homopolymerization or copolymerization of ethylene and 1-olefin, annular olefin, polar monomer and the like.

Description

technical field [0001] The invention relates to a new type of Ziegler-Natta olefin polymerization catalyst with single active center property. The catalyst uses a novel class of multidentate ligands as organic electron donors. Under the action of a co-catalyst, the catalyst can be used to catalyze the homopolymerization of ethylene or the copolymerization of ethylene and alpha-olefin to obtain a structure-controllable olefin polymer. Background technique [0002] With the rapid development of the polyolefin industry, the production of high-performance polyolefin materials has attracted more and more attention. At present, international research believes that the production of high-performance polyolefin materials can be realized in two ways: 1) using Ziegler-Natta catalysts, relying on the improvement of chemical processes; 2) using new single-site catalysts including metallocene catalysts and Non-generic catalysts. Since the discovery of Ziegler-Natta catalyst in the 195...

Claims

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Application Information

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IPC IPC(8): C08F10/00C08F4/658C08F4/656C08F4/654C08F4/02C08F10/02C08F2/06C08F2/34
Inventor 唐勇卫兵李军方孙秀丽
Owner SHANGHAI INST OF ORGANIC CHEMISTRY - CHINESE ACAD OF SCI
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