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Post-transition metal catalytic system for synthesizing branched polyethylene and its use

A late-transition metal and branched polyethylene technology, which is applied in the field of late-transition metal composite catalytic systems, achieves the effects of low price, simple polymerization process, and easy synthesis

Inactive Publication Date: 2006-10-18
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention solves the problems of the interference and compatibility of the two catalysts in the catalyst system, and provides a late-transition metal bifunctional catalytic system, that is, the same co-catalyst is used to activate the two main catalysts at the same time, so that In situ copolymerization of ethylene to obtain branched polyethylene

Method used

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  • Post-transition metal catalytic system for synthesizing branched polyethylene and its use

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Embodiment 11

[0029] Example 11 is the polymerization result obtained by adopting late transition metal catalyst ethylene homopolymerization

[0030] The specific description of embodiment is as follows:

Embodiment 1

[0032] (1) Synthesis of catalyst

[0033]At room temperature, weigh two parts of 2,6-diacetylpyridine, 0.5g each, 2ml of 2-methylaniline and 4ml of 2,6-dimethylaniline, and mix the above-mentioned part of 2,6-diacetylpyridine with 2 -Methylaniline was added to a round-bottomed flask, another part of 2,6-diacetylpyridine and 2,6-dimethylaniline was added to another round-bottomed flask, and then (30ml) 1,2 -dichloroethane, finally add five drops of formic acid, reflux cooling at 50°C for 48h, evaporate the solvent, add methanol and freeze at low temperature to obtain pale yellow crystal ligands A and B. Weigh 0.3g each of ligands A and B, add them to two single-necked flasks protected by argon and contain 20ml THF respectively, add 50mg metal halides to each, and carry out the reaction at room temperature for 2h. After the reaction, add 20ml diethyl ether, Finally, it was filtered and vacuum-dried at room temperature for 2 hours to obtain the blue iron oligomerization catalyst...

Embodiment 2

[0038] (1) Synthesis of catalyst

[0039] At room temperature, weigh two portions of 2,6-diacetylpyridine, 0.5g each, 2-methyl-4-chloroaniline (3ml) and 2,6-dimethylaniline (4ml), and the above-mentioned portion of 2, Add 6-diacetylpyridine and 2-methyl-4-chloroaniline to one round bottom flask, and another part of 2,6-diacetylpyridine and 2,6-dimethylaniline to another round bottom flask In the flask, add (30ml) 1,2-dichloroethane respectively, and finally add five drops of formic acid each, reflux cooling at 50°C for 48h, evaporate the solvent, add methanol and freeze at low temperature to obtain light yellow crystal ligands C and D until. Weigh 0.3g each of ligands C and D, add them to two single-necked flasks containing 20ml THF protected by argon, add 45mg of metal halides to each, react at room temperature for 2h, and add 20ml diethyl ether after the reaction , and finally filtered and dried in vacuum at room temperature for 2 hours to obtain the blue iron oligomerizat...

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Abstract

The post-transition metal catalytic system for synthesizing branched polyethylene and its application belong to the post-transition metal compound catalytic system and application for preparing branched polyethylene. The invention solves the problem of interference between the two catalysts in the main catalyst and can use the same cocatalyst. The catalytic system consists of a main catalyst and a co-catalyst. The main catalyst includes an oligomerization catalyst and a copolymerization catalyst; the oligomerization catalyst is a post-transition metal catalyst with steric hindrance of small substituents, and the copolymerization catalyst is a post-transition metal catalyst with steric hindrance of large substituents. Metal catalysts. This catalytic system has good catalytic activity, with an activity of 1×10 5 ~1×10 6 gPE / (mol·h·M), the monomer insertion rate is 7 to 3%. Under the action of cocatalyst alkylaluminoxane, the main catalyst makes ethylene as the only polymerization monomer perform series polymerization to obtain branched polyethylene resin. Its molecular weight range is 1×10 5 ~3×10 5 , melting point is 122~103℃.

Description

technical field [0001] The invention belongs to a post-transition metal composite catalytic system for preparing branched polyethylene and its application. By changing different catalytic reaction ratios, catalyst structures and different reaction conditions to regulate the performance of the polymer product, the structure of the polymer can be controlled. Background technique [0002] Branched polyethylene is a kind of polyethylene with excellent properties, which can be divided into short-chain branched polyethylene and long-chain branched polyethylene according to the length of the branch chain. Short chain branched polyethylene generally refers to linear low density polyethylene (LLDPE). It is obtained by the copolymerization of ethylene and α-olefin, mainly by the copolymerization of ethylene and butene-1. At present, it occupies about 40% of the polyethylene market with its excellent material properties. Long-chain branched polyethylene has better molding and proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F4/42
Inventor 闫卫东李贺新黄英娟杨敏李海青张旭胡友良
Owner HEBEI UNIV OF TECH
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