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Supported metallocene catalyst and application thereof

A technology of metallocene catalysts and metallocene compounds, which is applied in the field of metallocene polyethylene and supported catalysts, can solve the problems of poor processability, narrow distribution of branch chains, and high melt strength of polymers, etc., and achieve the effect of improving processability

Active Publication Date: 2018-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the field of olefin polymerization, traditional metallocene catalysts catalyze olefin polymerization to obtain polymers with narrow molecular weight distribution, narrow branch chain distribution, good mechanical properties, but poor processing performance, which is reflected in high energy consumption and low processing efficiency in practical applications.
From the perspective of practical application, the processing performance of the resin is reflected in the melt flow ratio of the resin, that is, the value of MFR (MI21.6 / MI2.16), the MFR of the traditional metallocene catalyst (non-bridged metallocene catalyst) polymer Between 16 and 20, the polymer melt has high strength and is difficult to process
Some bridged metallocene catalyst polymers have excellent processability due to the presence of long chain branches, but have some impact on mechanical properties. After loading, the molecular weight distribution of the product will be broadened. When producing medium and high density products, MFR is greater than >50, which is not good for the mechanical properties of the product

Method used

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  • Supported metallocene catalyst and application thereof
  • Supported metallocene catalyst and application thereof
  • Supported metallocene catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 (comparison)

[0034] Co-catalyst loading

[0035] Add 20 grams of silica carrier to the 250 ml glass bottle replaced with nitrogen, add 30 ml of toluene, raise the temperature of the system to 50 ° C, dropwise add the toluene solution of MAO (11 g MAO), react for 4 hours, filter, and wash with 30 ml of toluene for 3 times, then washed twice with hexane, and dried to obtain a white carrier with good fluidity.

[0036] Preparation of Supported Metallocene Catalysts

[0037]In the 250ml glass bottle that has been replaced with nitrogen, add 2g of the cocatalyst after the load of above-mentioned preparation, add 20ml toluene, start to stir, add dropwise 10ml twos (1-butylcyclopentadienyl) zirconium chloride (A) and The toluene solution of metallocene compound (B) rac-ethylene bridging bis-indenyl zirconium chloride, the molar ratio of compound B:A is 1:1, and the molar ratio of MAO to the sum of B and A is calculated as MAO:Zr 100:1, reacted for 30min under...

Embodiment 2

[0040] Embodiment 2 (comparison)

[0041] Same as Example 1, except that the molar ratio of compound B:A is 2:1. See Table 1 for the data.

Embodiment 3

[0043] Same as Example 1, except that the molar ratio of compound B:A is 3:1. See Table 1 for the data.

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Abstract

The invention relates to a supported metallocene catalyst. The supported metallocene catalyst is prepared with a method comprising the following steps: S1, treating a supporter with a cocatalyst to obtain a supporter-supported cocatalyst; S2, supporting a non-bridged metallocene compound and a bridged metallocene compound on the supporter-supported cocatalyst to obtain the catalyst. The catalyst can be used for olefin polymerization, such as ethylene polymerization, and medium-high-density metallocene polyethylene with density being 0.930-0.945 g / cm<3>, molecular weight distribution being 2.9-5.5 and MFR being 20-80 is obtained.

Description

technical field [0001] The invention relates to a metallocene polyethylene and a supported catalyst, in particular to a supported metallocene catalyst and the easy-to-process metallocene polyethylene obtained by catalyzing ethylene copolymerization. Background technique [0002] In the field of olefin polymerization, traditional metallocene catalysts catalyze olefin polymerization to obtain polymers with narrow molecular weight distribution, narrow branch chain distribution, good mechanical properties, but poor processing performance, which is reflected in high energy consumption and low processing efficiency in practical applications. . From the perspective of practical application, the processing performance of the resin is reflected in the melt flow ratio of the resin, that is, the value of MFR (MI21.6 / MI2.16), the MFR of the traditional metallocene catalyst (non-bridged metallocene catalyst) polymer Between 16 and 20, the polymer melt has high strength and is difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/6592C08F4/02C08F210/16C08F210/14
CPCC08F4/025C08F4/65925C08F4/65927C08F10/02C08F210/16C08F210/14C08F2500/04C08F2500/12
Inventor 郑刚马蓓蓓刘长城
Owner CHINA PETROLEUM & CHEM CORP