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Method for preparing polyethylene catalyst

A technology for polyethylene and catalyst is applied in the field of polyethylene catalyst to prepare high-branched polyethylene by using single ethylene as raw material, and the preparation field of polyethylene catalyst, and achieves the effects of reducing production cost, improving the difficulty of continuous polymerization and having good particle shape.

Active Publication Date: 2017-07-07
谢炳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of oligomerization catalysts in the prior art, and realize the catalytic system of preparing high branched polyethylene in situ by using ethylene as a single monomer through a double active center catalyst

Method used

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  • Method for preparing polyethylene catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) prepare magnesium alkoxide solution

[0051] Add 100ml of cyclohexanone into a reaction vessel with a condensing device fully replaced with nitrogen, pass through nitrogen, slowly add 0.1 mole of ethoxymagnesium with the stirring turned on, and raise the temperature to 100°C for 3 hours. After the reaction is completed, Filtrate hot, and filter out the residue under the reaction vessel under the protection of nitrogen.

[0052] (2) Treatment of cyanocene compounds

[0053] Add 0.02 mol of IndCpZrCl to another reaction vessel fully replaced with nitrogen 2 , add 20ml of 10% MAO toluene solution under stirring, raise the temperature to 100°C and react for 4 hours, cool to room temperature after the reaction is completed, filter off the supernatant, wash with hexane, dry and add to the solution as described in (1) above for later use .

[0054] (3) Catalyst preparation

[0055] Add the solution obtained in the above (2) into a nitrogen-protected spray dryer, and se...

Embodiment 2

[0057] (1) prepare magnesium alkoxide solution

[0058] Add 85ml of isooctyl alcohol into a reaction vessel with a condensing device fully replaced with nitrogen, pass through nitrogen, slowly add 0.1 mole of ethoxymagnesium with the stirring turned on, and raise the temperature to 85°C for 3 hours. After the reaction is completed, Filtrate hot, and filter out the residue under the reaction vessel under the protection of nitrogen.

[0059] (2) Treatment of cyanocene compounds

[0060] In another reaction vessel fully replaced with nitrogen, add 0.01, mole Cp 2 ZrCl 2 , add 30ml of 10% MAO toluene solution under stirring, raise the temperature to 100°C and react for 4 hours, after the reaction is completed, cool to room temperature, filter off the supernatant, wash with hexane, dry and add to the solution as described in (1) above spare.

[0061] (3) Catalyst preparation

[0062] Add the solution obtained in the above (2) into a nitrogen-protected spray dryer, set the feed...

Embodiment 3

[0064] (1) prepare magnesium alkoxide solution

[0065] Add 110 ml of cyclohexanone and 1,3 propylene oxide mixture (volume ratio 1:1) into a reaction vessel with a condensing device fully replaced with nitrogen, feed nitrogen, and slowly add 0.03 mol of Magnesium methoxide was heated to 30°C for 3 hours to react. After the reaction was completed, it was heated and filtered, and the residue under the container was filtered out under the protection of nitrogen.

[0066] (2) Treatment of cyanocene compounds

[0067] Add 0.01 mole of Cp to another reaction vessel fully replaced with nitrogen 2 ZrMe 2 , add 20ml of 10% MAO toluene solution under stirring, raise the temperature to 100°C and react for 4 hours, cool to room temperature after the reaction is completed, filter off the supernatant, wash with hexane, dry and add to the solution as described in (1) above for later use .

[0068] (3) Catalyst preparation

[0069] Add the solution obtained in the above (2) into a nitro...

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Abstract

The invention discloses a method for preparing a polyethylene catalyst. The method comprises the following steps that 1, in the presence of inert gas nitrogen, organic oxide and an alkoxy magnesium compound are subjected to a haptoreaction to form a homogeneous system; 2, a granular metallocene compound is added into the homogeneous system, stirring is carried out, and uniform slurry is formed; 3, the slurry is spray-dried, and microsphere particles are obtained; 4, the microsphere particles and a titanium active component are subjected to a haptoreaction, and the solid catalyst is obtained. Ethylene is adopted as a unique monomer, different active components in the catalyst act at the same time, and the polyethylene product with a high branch degree is prepared. It is avoided that when a branched polyethylene product is produced, expensive short-branch alpha olefin is used, and the product production cost is reduced. The problems that in the prior art, multiple compounded catalysts are complex in preparation process, and matching performance is hard to achieve are solved.

Description

technical field [0001] The invention belongs to the field of polyethylene catalysts, and in particular relates to a preparation method of the polyethylene catalyst and the use of the polyethylene catalyst to prepare high-branched polyethylene by using single ethylene as a raw material. Background technique [0002] Traditional Z-N catalysts have good catalytic activity for ethylene polymerization, and can prepare polyethylene products with different branching degrees, but the products have low branching degrees and have defects in product performance. In order to obtain branched polyethylene products, it is necessary to copolymerize with α-olefin to increase the branching degree of the product, but the high cost of comonomer α-olefin increases the cost of polyethylene products. At the same time, due to the single chain length of the comonomer alpha olefin, it is difficult to obtain long-chain branched polyethylene products. The catalytic system made by the diimine complexes...

Claims

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Application Information

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IPC IPC(8): C08F4/02C08F4/642C08F4/6592C08F110/02C08F210/02
CPCC08F110/02C08F210/02C08F4/02C08F4/6421C08F4/6592Y02P20/52
Inventor 谢炳
Owner 谢炳
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