Catalyst active component for ethylene polymerization or copolymerization and catalyst precursor comprising the active component and preparation method thereof

An active component, ethylene polymerization technology, applied in the production of bulk chemicals, etc., can solve the effect of decomposition degree on catalytic activity, polymer morphology and hydrogen adjustment sensitivity, easy to decompose, no modification of metal active center or poor modification Strong and other issues

Active Publication Date: 2008-03-12
BEIJING JINDINGKE CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this preparation method, although the added tetraalkoxysilane electron donor has great benefits to keep the catalyst form and the form of the obtained polymer, it is easy to decompose, and its decomposition degree has a great influence on catalytic activity, polymer form and hydrogen modulation sensitivity are greatly affected
[0009]Chemical modification of the support by adding a suitable internal electron donor can indeed improve the morphology of the catalyst, but only the support can be modified, and there is no effect on the metal active center. Modified or less modified

Method used

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  • Catalyst active component for ethylene polymerization or copolymerization and catalyst precursor comprising the active component and preparation method thereof
  • Catalyst active component for ethylene polymerization or copolymerization and catalyst precursor comprising the active component and preparation method thereof
  • Catalyst active component for ethylene polymerization or copolymerization and catalyst precursor comprising the active component and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1～38

[0098] Preparation of magnesium composite support

[0099] Under a nitrogen atmosphere, 8 grams of magnesium powder (150 μm) and 360 mL of hexane solvent were added to the reactor, and then 5.0 grams of Davison955 silica gel (produced by Grace, USA), 36 mL of n-chlorobutane, 20 mL of Si(OC 2 h 5 ) 4 , 5mL Ti(OC 4 h 9 ) 4 and 0.4 g I 2 Initiate at 60°C. After initiation, slowly add 110mL of n-chlorobutane and 140mL of hexane mixed solvent dropwise. After the dropwise addition, raise the temperature to 70°C for 2 hours to prepare the magnesium composite carrier.

[0100] Preparation of catalyst precursor

[0101] Place 4.76 grams of the prepared magnesium composite carrier in a reaction flask, add 50 mL of n-hexane, and sequentially add 3.1 mL of isooctyl alcohol (0.02 mol), 1.65 mL of γ-chloropropyltrimethoxysilane and 1.65 mL of γ- Chloropropyltriethoxysilane was heated to 50°C for 1 hour reaction, then 10ml of toluene solution dissolved with 4.6mmol of a catalytic accele...

preparation example 39

[0107] The catalyst precursor of the present invention was prepared by the same method as in Example 1 except that the amount of α-acetylnaphthol was 2.3 mmol. The Ti content and Mg content of the prepared catalyst precursor were as follows: Ti mass %: 2.41; Mg mass %: 21.02.

preparation example 40

[0109] The catalyst precursor of the present invention was prepared by the same method as in Example 1 except that the amount of α-acetylnaphthol was 6.9 mmol. The Ti content and Mg content of the prepared catalyst precursor were as follows: Ti mass %: 7.2; Mg mass %: 14.31.

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Abstract

The present invention provides catalyst active components used in ethylene polymerization or polymerization, the catalyst precursors as well as the preparation method of the catalyst active components. The catalyst active components in the present invention comprise: magnesium compounds; titanium compounds Ti (OR) 4-n X n , where X is halogen, R is alkyl, n is O or an integer less than or equals 4; catalytic accelerant which is of chelate function and is of matching iron of [O,O] or[O,N]; Electron donor with silicon; Organic ester R'OH, where R' represents alkyl; and halogenated hydrocarbon. The catalyst precursors provided in the present invention are firm particles with high catalytic activity, stable dynamics and good polymerization and hydrogen-sensitive performance. The polyethylene products obtained from the catalyst precursors are particles of good shape, with the particle diameter evenly distributed. The density of the particles is high.

Description

technical field [0001] The invention relates to a catalyst active component for ethylene polymerization or copolymerization, a catalyst precursor comprising the active component and a preparation method thereof. Background technique [0002] The requirements for catalysts for ethylene polymerization or copolymerization are getting higher and higher. Not only are they required to have high catalytic activity, but they are also required to have long-term performance. More importantly, they are required to have strong copolymerization performance, hydrogen modulation Good sensitivity. At the same time, it is also required that the molecular weight and molecular weight distribution of the polymer prepared by using the catalyst can be controlled, and the obtained polyethylene should have a large bulk density, a uniform particle size distribution, and less fine powder, so as to stabilize the process and improve operating efficiency. . This is the direction of future polyethylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/645C08F4/649
CPCY02P20/52
Inventor 徐江
Owner BEIJING JINDINGKE CHEM TECH
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