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Method for preparing bipeak molecular weight distribution polyethylene by calalyst comixing system

A molecular weight distribution and catalyst technology, applied in the field of preparing bimodal molecular weight distribution polyethylene

Inactive Publication Date: 2007-02-14
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of blended product with bimodal distribution and high branching degree in high molecular weight part and low branching degree in low molecular weight part has never been reported.

Method used

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  • Method for preparing bipeak molecular weight distribution polyethylene by calalyst comixing system
  • Method for preparing bipeak molecular weight distribution polyethylene by calalyst comixing system
  • Method for preparing bipeak molecular weight distribution polyethylene by calalyst comixing system

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Under ethylene atmosphere, in 2L reactor, add catalyst a to be 0.0372g, be equivalent to 60μmol Co, anhydrous toluene 1300ml, 2mol / L modified methyl aluminoxane (MMAO) 45ml, adjust ethylene pressure to be 10 atmospheres, room temperature Polymerize for 60 minutes, pour the reaction mixture into 2000ml of 1% hydrochloric acid ethanol solution, make it fully precipitate and filter. The product was washed with ethanol and acetone respectively, and then vacuum-dried at 60° C. for 24 hours to obtain a monomodal molecular weight distribution polyethylene product 1 with a yield of 198.22 g. The catalytic efficiency is 1637Kg polyethylene / molNi·h, the relative weight average molecular weight is 22.87Kg / mol, the relative molecular weight distribution is 3.03, and the relative molecular weight distribution is a narrow single peak. pass 13 C-NMR spectrum analysis proves that it is a linear structure, and its melting temperature is 133.1°C, crystallization temperature is 120.8°C a...

Embodiment 2

[0027] Under ethylene atmosphere, in 2L reactor, add catalyst b to be 0.0432g, be equivalent to 60 μ mol Ni, other operation is the same as embodiment 1, obtain the product 9 of monomodal molecular weight distribution polyethylene, output is 129.5g, catalytic efficiency 2158Kg polyethylene / molNi h, the relative weight average molecular weight is 252.42Kg / mol, the relative molecular weight distribution is 2.80, and the relative molecular weight distribution is a relatively narrow single peak. pass 13 C-NMR spectrum analysis calculates that its branching degree reaches 30.43%, and there is no melting and crystallization in the polyethylene sample as tested by DSC.

Embodiment 3

[0029] Under an ethylene atmosphere, in a 2L reactor, mix the two catalysts with a molar mass ratio of 7:1, add catalyst a 0.0326g, equivalent to 53 μmol Co and catalyst b 0.0054g, equivalent to 7 μmol Ni, and the rest of the operations are the same as in Example 1. Obtain the product 2 of bimodal molecular weight distribution polyethylene, output is 100.98g, catalytic efficiency 1683Kg polyethylene / molCat h, relative weight average molecular weight is 111.55Kg / mol, relative molecular weight distribution is 10.36, and relative molecular weight distribution is wider double peak. The low relative molecular weight component content is 79.21%, and the high relative molecular weight component content is 20.79%. According to DSC test, its melting temperature is 132.1°C, its crystallization temperature is 119.3°C, and its crystallinity is 73%.

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Abstract

The present invention relates to high pressure polymerization reaction process catalyzed with the mixture of two kinds of post-transition metal catalyst to prepare polyethylene with double molecular weight distribution peaks. These two kinds of catalyst are mixed in different ratio and are acted with co-catalyst modified methyl aluminoxane to catalyze the ethylene polymerization in single high pressure reaction kettle, so as to obtain blended polyethylene with double peak molecular weight distribution through one-step reaction. The produced blended polyethylene includes high molecular weight component with high branching degree and low molecular weight component with linear structure and greatly improved mechanical performance and machining performance.

Description

technical field [0001] The invention relates to a method for preparing polyethylene with bimodal molecular weight distribution from a catalyst blending system, in particular to a method for preparing polyethylene with bimodal molecular weight distribution by blending two late transition metal catalysts. technical background [0002] Bimodal molecular weight distribution polyethylene is a general-purpose resin with a wide range of uses and a good market prospect. The research on bimodal molecular weight distribution polyethylene at home and abroad has made great progress. The key field is the research on the preparation process and catalyst of bimodal molecular weight distribution polyethylene. The key technology is how to control the bimodal molecular weight and its distribution. The bimodal molecular weight distribution not only greatly affects the characteristics of the final product, but also has a great influence on the post-processing process. Generally, the relative m...

Claims

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Application Information

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IPC IPC(8): C08F110/02C08F4/70
Inventor 李悦生潘莉李彦国
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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