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External electron donor composition, olefin polymerization catalyst and application thereof, and polyolefin and preparation method thereof

An external electron donor and olefin polymerization technology, applied in the field of olefin polymerization, can solve the problems of narrow molecular weight distribution of polypropylene and achieve the effects of wide relative molecular weight distribution, high isotactic index, and high MFR

Active Publication Date: 2022-07-26
CHINA ENERGY GRP NINGXIA COAL IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of narrow molecular weight distribution of polypropylene in the prior art, and to provide an external electron donor composition, an olefin polymerization catalyst and its application, polyolefin and its preparation method

Method used

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  • External electron donor composition, olefin polymerization catalyst and application thereof, and polyolefin and preparation method thereof
  • External electron donor composition, olefin polymerization catalyst and application thereof, and polyolefin and preparation method thereof
  • External electron donor composition, olefin polymerization catalyst and application thereof, and polyolefin and preparation method thereof

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Experimental program
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specific Embodiment approach

[0044] According to a preferred embodiment of the present invention, the first external electron donor compound is selected from the group consisting of the compound represented by formula I-1, the compound represented by formula I-2 and the compound represented by formula I-3 At least one of:

[0045]

[0046] In some embodiments of the present invention, the molar ratio of the first external electron donor compound and the second external electron donor compound is 1-10:1. Preferably, the molar ratio of the first external electron donor compound and the second external electron donor compound is 2.5-9:1, more preferably 3-8:1, further preferably 3-5:1. In the present invention, the new active center formed by the coordination between the first external electron donor compound and the active center of the catalyst can induce polymerization to obtain a polymer with both high activity and high regularity; The new active center formed by the coordination of the active center...

preparation example 1

[0120] Preparation Example 1 is used to prepare the first external electron donor compound A represented by formula I-1:

[0121]

[0122] (1) Preparation of Grignard reagent

[0123] Take a 500 ml three-necked flask with a magnetron, a spherical condenser and a constant pressure dropping funnel, add magnesium powder (28.8 g, 1.2 mol) and a little iodine under nitrogen protection; add ortho-bromine to the constant pressure dropping funnel Anisole (1.0 mol) and tetrahydrofuran (200 ml), then 5 ml of o-bromoanisole in tetrahydrofuran was added dropwise to the flask, stirred for 3-5 minutes to initiate the reaction; then o-bromoanisole was added dropwise tetrahydrofuran solution; after the dropwise addition is completed, heat under reflux for 1 hour to complete the preparation of Grignard reagent.

[0124] (2) Synthesis of Silane

[0125] Take a 2.5-liter three-necked flask with a magnetron and a spherical condenser, add diphenyldichlorosilane (253 g, 1.0 mol) and 500 mL of ...

preparation example 2

[0127] Preparation Example 2 is used to prepare the first external electron donor compound B represented by formula I-2:

[0128]

[0129] According to the method of Preparation Example 1, the difference is that in step (1), an equal amount of 1-bromo-2-methoxy-3-methylbenzene is used In place of o-bromoanisole, the obtained product was identified as the first external electron donor compound B represented by formula I-2 (the yield was 75% by weight) through hydrogen nuclear magnetic resonance spectroscopy.

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Abstract

The invention relates to the field of olefin polymerization, and discloses an external electron donor composition, an olefin polymerization catalyst and its application, as well as a polyolefin and a preparation method thereof. The external electron donor composition contains a first external electron donor compound and a second external electron donor compound, wherein the first external electron donor compound is selected from at least one of compounds having the structure shown in formula I: The two external electron donor compounds have the structure shown in formula II: the molar ratio of the first external electron donor compound and the second external electron donor compound is 1-10:1. The olefin polymerization catalyst obtained by using the external electron donor composition of the present invention has high hydrogen modulation sensitivity, and when used in olefin polymerization, it can prepare polyolefins with wider molecular weight distribution and higher melt index with higher catalytic activity. The production of polypropylene with high MFR, high tactical index and broad relative molecular mass distribution in a single reactor is achieved.

Description

technical field [0001] The invention relates to the field of olefin polymerization, in particular to an external electron donor composition, an olefin polymerization catalyst and application thereof, and a polyolefin and a preparation method thereof. Background technique [0002] The relative molecular mass distribution of polypropylene affects its mechanical properties and processability. Ziggler-Natta (Z-N) catalyst based on the succinate of Basell Poliolefin Company in Italy and the cyanosuccinate developed by the Beijing Research Institute of Chemical Industry of China Petrochemical Corporation (Sinopec) as the internal electron donor, can be used for the preparation of wide Relative molecular mass distribution of polypropylene. In addition, when dicyclopentyldimethoxysilane (DCPDMS) is used as the external electron donor of the Z-N catalyst, polypropylene with a wider relative molecular mass distribution can be obtained. However, these catalysts have poor hydrogen tun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F4/649
CPCC08F110/06C08F4/6498Y02P20/52
Inventor 焦洪桥李化毅张彤辉李倩张利军罗志张荣胡友良王伟袁小军
Owner CHINA ENERGY GRP NINGXIA COAL IND CO LTD
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