Catalyst system for ethylene polymerization

A catalyst and system technology, applied in the direction of organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, organic chemistry, etc., can solve the inconvenience of production and operation, the inability to produce high molecular weight polymers, Can not produce ethylene oligomers and other problems, to achieve the effect of simple synthesis

Inactive Publication Date: 2010-02-17
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the R4 group increases the electron-donating ability of the ligand, the β-H transfer rate increases, and the main product of the polymerization is an oligomer, which cannot produce a high molecular weight polymer.
[0009] The Chinese patent with the application number 200710070353.9 discloses a post-transition catalytic system for catalyzing iron acetylacetonate with bridged pyridine diimine compounds. This type of catalyst can effectively produce bimodal molecular weight polyethylene, but cannot produce ethylene oxide. polymer
In addition, although this type of catalyst has low raw material cost and is easy to synthesize, it must be prepared under anhydrous and oxygen-free conditions like the original olefin catalyst, and it needs to be stored under the protection of an inert gas, which brings great harm to production and operation. inconvenient

Method used

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  • Catalyst system for ethylene polymerization
  • Catalyst system for ethylene polymerization
  • Catalyst system for ethylene polymerization

Examples

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preparation example Construction

[0048] Preparation of pyridinediimine ligand

[0049] (1) 2,6-bis[1-(2,6-dimethylphenylimino)ethyl]pyridine (L 1 )Synthesis

[0050] Dissolve 3g (18.4mmol) of 2,6-diacetylpyridine and 8.9g (73.6mmol) of 2,6-dimethylaniline in 50ml of absolute ethanol, add 5 drops of glacial acetic acid, and heat to reflux for 48h. The system was cooled to room temperature, most of the solvent was distilled off under reduced pressure, and crystallized at -18°C. After suction filtration, it was dissolved in 25ml of hot alcohol and crystallized at -18°C. Suction filtration, drying, and weighing obtained 4.83 g of solid, namely 2,6-bis[1-(2,6-dimethylbenimino)ethyl]pyridine, with a yield of 71.0%.

[0051] (2) 2,6-bis[1-(2-methyl-6-isopropylphenylimino)ethyl]pyridine (L 2 )Synthesis

[0052] Dissolve 3g (18.4mmol) of 2,6-diacetylpyridine and 11g (73.6mmol) of 2-methyl-6-isopropylaniline in 50ml of absolute ethanol, add 5 drops of glacial acetic acid, and heat to reflux for 48h. The system was...

Embodiment 1

[0068] In a 250ml glass reactor, add 100ml of toluene and keep the temperature at 30°C. Then add 2umol2,6-bis[1-(2,6-dimethylbenimino)ethyl]pyridine (L 1 ), 2umol iron acetylacetonate and 400umol MAO. Feed ethylene gas under stirring, the ethylene pressure is normal pressure, react for 30 minutes, terminate the reaction with 10ml hydrochloric acid ethanol solution with a weight percent concentration of hydrochloric acid of 10%, filter the solvent, and vacuum dry at 50°C to obtain the poly vinyl. This reactivity is 3.00×10 6 g polyethylene / (mol Fe·hatm). The properties of polyethylene are shown in Table 1.

Embodiment 2

[0070] In a 250ml glass reactor, add 100ml of toluene and keep the temperature at 30°C. Then add 2umol2,6-bis[1-(2-methyl-6-isopropylphenylimino)ethyl]pyridine (L 2 ), 10umol cobalt acetylacetonate and 3000umol MAO. Feed ethylene gas under stirring, the ethylene pressure is normal pressure, react for 30 minutes, terminate the reaction with 10ml hydrochloric acid ethanol solution with a weight percent concentration of hydrochloric acid of 10%, filter the solvent, and vacuum dry at 50°C to obtain the poly vinyl. This reaction activity is 7.10×10 4 g polyethylene / (mol Fe·hatm). The properties of polyethylene are shown in Table 1.

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Abstract

The invention discloses a catalyst system for ethylene polymerization, comprising three components a, b and c. The component a is a pyridine diimine ligand with a structural formula (I) or a structural formula (II); the component b is an acetylacetone salt compound; the component c is an aid catalyst; a mol ratio of the component b to the component a is (0.01-100):1; and a mol ratio of the component c to the component b is (10-10,000):1. The invention also discloses the applications of the catalyst system in the preparation of single-peak distributed polyethylene, double-peak distributed polyethylene, polyethylene with super high molecular weight and an ethylene oligomer by the ethylene polymerization.

Description

technical field [0001] The invention relates to the field of olefin polymerization catalysts, in particular to a catalyst system for ethylene polymerization and its application in the preparation of unimodal polyethylene, bimodal polyethylene, ethylene oligomers and ultra-high molecular weight polyethylene. Background technique [0002] Polyethylene is a very important synthetic plastic. At present, most of the industrial production of polyethylene is a heterogeneous Zieglar-Natta catalyst. It is Zieglar et al. who are studying AlEt 3 Found when catalyzing the oligomerization of ethylene, the main catalyst is an early transition metal complex such as titanium, zirconium, chromium and vanadium, and the co-catalyst is AlEt 3 、Al(iBu) 3 , ZnEt 2 and other alkyl compounds, the carrier is mostly magnesium compounds, such as MgCl 2 , Mg(OH) 2 , Mg(OH)Cl, MgO and other carriers. [0003] The catalytic system composed of metallocene and methylaluminoxane (MAO) can complete the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/70B01J31/22C07C2/32
CPCY02P20/52
Inventor 阳永荣历伟黄杏冰张乐天秦伟吴晶王靖岱蒋斌波黄正梁
Owner ZHEJIANG UNIV
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