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Compound catalyst for olefin polymerization

An olefin polymerization and catalyst technology, applied in the field of composite catalyst and its preparation, can solve the problem of low catalyst activity, and achieve the effect of high activity and improved performance

Active Publication Date: 2005-09-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the activity of the catalyst is low, and the polymerization reaction of ethylene needs to be carried out under higher pressure

Method used

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  • Compound catalyst for olefin polymerization
  • Compound catalyst for olefin polymerization

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Effect test

Embodiment

[0047] 1. For the synthesis of Ziegler-Natta catalyst components, refer to the preparation method of Chinese Patent ZL98101108.X Example 1:

[0048] In the high-purity N 2 In the fully replaced reactor, sequentially add 0.042mol anhydrous MgCl 2 , 60ml of toluene, 0.032mol of epichlorohydrin, 0.022mol of tributyl phosphate, 0.017mol of ethanol, heated to 50°C under stirring, and maintained for 15 minutes to completely dissolve the solid to form a uniform solution, then add 0.0074mol of phthalic anhydride , maintained for another 1 hour, cooled the solution to -2.5°C, then dropped 0.5mol titanium tetrachloride into it, then slowly raised the temperature to 80°C, reacted for 3 hours, filtered and washed 6 times with toluene and hexane respectively, Vacuum dried to obtain a solid catalyst component.

[0049] 2. Synthesis of late transition metal catalyst components:

[0050] (1) Synthesis of 2,6-diiminopyridine ligand

[0051] In the high-purity N 2 In a fully replaced glass...

example 1

[0058] 1. Synthesis of composite catalyst: after high-purity N 2 In the fully replaced glass stirring bottle, add Ziegler-Natta catalyst component 2.5g and 15mL MAO prepared above at room temperature under nitrogen protection and stir for 20min, add 50mL iron catalyst toluene solution prepared above (containing 2,6-di[1 -(2,6-Diisopropylphenylimine)ethyl]pyridineFeCl 2 0.5g+50mL MAO) and stirred for 30min, added 75mL of hexane and stirred for 20min, filtered, washed 6 times with 50mL of hexane, and vacuum dried to obtain a powdery solid catalyst.

[0059] 2. Polymerization of ethylene: in Example 1 of the polymerization method, 4.0 mL of 1M triethylaluminum hexane solution was used as a cocatalyst.

[0060] Polymerization activity: 2730gPE / gcat

[0061] Molecular weight of polymer powder and its distribution Mn=67209, Mw=977490, Mw / Mn=14.54

Embodiment 2

[0063] Catalyst is the same as embodiment 1, when only polymerizing with AlEt 3 Change to MAO2.3ml with a concentration of 1.66M.

[0064] Polymerization activity: 2456gPE / gcat

[0065] Polymer powder molecular weight and its distribution Mn=16323, Mw=766741, Mw / Mn=46.971 Catalyst component 16mg, polymerization method is the same as embodiment 1, just changes cocatalyst into 1.66M MAO2.3ml.

[0066] Polymerization activity: 1663 gPE / gcat.

[0067] Polymer molecular weight and its distribution Mn=623447, Mw=1586213, Mw / Mn=2.544

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Abstract

This invention provides a complex type catalyst. At least one catalyst component of Ziegler-Natta contains titanium, one catalyst component contains offspring transition metal and one reaction product of activator. Wider molecular weight distributing polymer an be made when the catalyst is glomerated with ethane, its activity is high, and the polymer got can has good chain structure, so the capability of resin will be improved greatly.

Description

technical field [0001] The invention relates to a catalyst for olefin polymerization, more specifically, to a composite catalyst containing double active centers for ethylene polymerization or copolymerization and its preparation method and application. Background technique [0002] As we all know, realizing the high performance of polyethylene resin is an important issue in the current development of polyethylene technology, and how to achieve a balance between the mechanical properties and processing properties of the resin at a higher level and improve the application grade of materials is the key to high performance of polyethylene. An important aspect for which there is increasing focus on the development of broad molecular weight distribution or bimodal molecular weight distribution polyethylene resins. Usually, the ideal bimodal molecular weight distribution polyethylene resin should have long-segment polyethylene and relatively short-segment polyethylene, in which th...

Claims

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Application Information

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IPC IPC(8): C08F4/70C08F10/00
Inventor 金茂筑陈齐王毅孙怡菁高克京邢宝泉朱宝兰
Owner CHINA PETROLEUM & CHEM CORP
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