Olefin polymerization catalyst as well as preparation method and application thereof

A technology of olefin polymerization and catalyst, which is applied in the field of preparation of multi-active center catalysts, can solve the problems of low catalytic activity, complicated preparation process, high preparation cost, etc., and achieve the effect of stable reaction efficiency

Active Publication Date: 2015-02-18
SHANGHAI RES INST OF CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The bimetallic catalyst is used in combination with a cocatalyst for ethylene polymerization, and the polyethylene produced has a wide molecular weight distribution between 7-20, but the catal

Method used

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  • Olefin polymerization catalyst as well as preparation method and application thereof
  • Olefin polymerization catalyst as well as preparation method and application thereof
  • Olefin polymerization catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Catalyst preparation

[0057] (1) Under the protection of anhydrous and oxygen-free nitrogen, add 100ml of hexane into a 250ml four-necked flask, then add hexane solvent containing 0.5g of dibutylmagnesium to it, and keep stirring all the time, add 0.67g Ethanol, heated to 70°C, reacted for 1 hour, then added 1.09 g of ethyl benzoate, reacted for 1 hour, then added 0.41 g of titanium tetrachloride, reacted for 2 hours, then added 4.35 g of silicon dioxide, reacted for 2 hours, and obtained Suspension a.

[0058] (2) Under the protection of anhydrous and oxygen-free nitrogen, add 100ml of hexane into a 250ml four-necked flask, then add hexane solvent containing 0.5g of dibutylmagnesium to it, and keep stirring all the time, add 0.67g Ethanol, heated to 70°C, reacted for 1 hour, then added 1.09 g of ethyl benzoate, reacted for 1 hour, then added 0.28 g of vanadium tetrachloride, reacted for 2 hours, then added 4.35 g of silicon dioxide, reacted for 2 hours, and obtained ...

Embodiment 2

[0064] The preparation of the catalyst is the same as in Example 1; in the polymerization evaluation conditions, the polymerization temperature is 60° C., and other conditions are the same as in Example 1.

[0065] 0.0548 g of catalyst was actually added to obtain 319 g of polyethylene, and the catalytic efficiency was 5821 g PE / g Cat. The density of the polymer is 0.9541g / cm 3 , the melt index is 12.48 (21.6kg / 10min)

Embodiment 3

[0067] The preparation of the catalyst is the same as in Example 1; in the polymerization evaluation conditions, the polymerization temperature is 70° C., and other conditions are the same as in Example 1.

[0068] 0.0537g of catalyst was actually added to obtain 321g of polyethylene, and the catalytic efficiency was 5977g PE / g Cat. The density of the polymer is 0.9550g / cm 3 , the melt index is 15.84 (21.6kg / 10min)

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Abstract

The invention relates to an olefin polymerization catalyst as well as a preparation method and application thereof. The olefin polymerization catalyst consists of a main catalyst component and a cocatalyst, wherein the main catalyst component is prepared by the following method: (1) reacting an organic magnesium compound with a hydroxyl group-containing compound in a carrier dispersant, adding a compound containing lone pair electrons for sufficient reaction, and then adding a titanium-containing compound and an inert carrier to obtain a suspension a; (2) reacting the organic magnesium compound with the hydroxyl group-containing compound in the carrier dispersant, adding the compound containing lone pair electrons for sufficient reaction, and then adding a vanadium-containing compound and the inert carrier to obtain a suspension b; (3) mixing the suspension a and the suspension b, adding an active center valence state regulator, and then drying through distillation to obtain the main catalyst component; the cocatalyst is at least one organic aluminum compound with the general formula of AlR5xCl3-x. Compared with the prior art, the olefin polymerization catalyst has the advantages of steady reaction efficiency within a relatively wide reaction temperature range, and the like.

Description

technical field [0001] The invention relates to a catalyst, in particular to a method for preparing a multi-active center catalyst for olefin polymerization. The catalyst can maintain a stable and uniform polymerization efficiency in the range of 50-90°C, and the polymer can be made The molecular weight distribution is greatly broadened. Background technique [0002] The molecular weight and molecular weight distribution of polyethylene have an important influence on the rheological properties of its melt and the mechanical properties of its products. Wide molecular weight distribution polyethylene is one of the important development fields of polyethylene technology in recent years. Unlike ordinary polyethylene materials, wide molecular weight distribution polyethylene can not only maintain the mechanical properties, hardness and environmental stress cracking resistance of high molecular weight polyethylene, Moreover, it can improve the processing performance of polyethyle...

Claims

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Application Information

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IPC IPC(8): C08F110/02C08F210/16C08F4/685C08F4/646
Inventor 郭宇李阳阳肖明威叶晓峰
Owner SHANGHAI RES INST OF CHEM IND
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