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

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

Active Publication Date: 2021-07-09
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, application of olefin polymerization catalyst, polyolefin and preparation method of polyolefin
  • External electron donor composition, olefin polymerization catalyst, application of olefin polymerization catalyst, polyolefin and preparation method of polyolefin
  • External electron donor composition, olefin polymerization catalyst, application of olefin polymerization catalyst, polyolefin and preparation method of polyolefin

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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 compound shown in formula I-1, the compound shown in formula I-2 and the compound shown in 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 to the second external electron donor compound is 1-10:1. Preferably, the molar ratio of the first external electron donor compound to 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 coordination between the first external electron donor compound and the active center of the catalyst can induce polymerization to obtain a polymer with high activity and high isotacticity; the second external electron donor compound and the catalyst The new active center formed by the coordination of the act...

preparation example 1

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

[0121]

[0122] (1) Preparation of Grignard reagent

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

[0124] (2) Synthesis of silane

[0125] Take a 2.5-liter three-neck flask with a magnet and a spherical condenser, add diphenyldichlorosilane (253 g, 1.0 mol) and 500 ml of tetrahydro...

preparation example 2

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

[0128]

[0129] According to the method of Preparation Example 1, the difference is that in step (1), an equivalent amount of 1-bromo-2-methoxy-3-methylbenzene Instead of o-bromoanisole, the obtained product was determined to be the first external electron donor compound B shown in formula I-2 (yield: 75% by weight) by proton nuclear magnetic resonance.

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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 an application thereof, 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, the first external electron donor compound is selected from at least one of compounds with a structure as shown in a formula I; the second external electron donor compound has a structure as shown in a formula II; and the molar ratio of the first external electron donor compound to the second external electron donor compound is (1-10): 1. The olefin polymerization catalyst prepared from the external electron donor composition is high in hydrogen regulation sensitivity, and polyolefin with wide molecular weight distribution and high melt index can be prepared with high catalytic activity when the olefin polymerization catalyst is used for olefin polymerization. The preparation of polypropylene with high MFR, high isotactic index and wide relative molecular mass distribution in a single reactor is realized.

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 its application, polyolefin and its preparation method. Background technique [0002] The relative molecular mass distribution of polypropylene affects its mechanical properties and processing properties. Ziggler-Natta (Z-N) catalyst based on the succinate of Italy BasellPoliofin and the cyanosuccinate developed by Beijing Research Institute of Chemical Industry of China Petroleum and Chemical Corporation (Sinopec for short) as an internal electron donor can be used to prepare 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 molecular mass distribution can be obtained. However, these catalysts have poor sensitivity to hydrogen adjustment, that is, und...

Claims

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Application Information

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Patent Type & Authority Applications(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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