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Catalyst and polymerization method for preparing high MFR polypropylene with hydrogen regulation method

A catalytic system and catalytic component technology, applied in the production of bulk chemicals, etc., can solve problems such as poor and obvious effects

Active Publication Date: 2011-10-26
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of diether and siloxane can also achieve the purpose of regulating the isotacticity, molecular weight distribution and MFR of polypropylene (US5869418), but its effect is not as obvious as the combination of two silanes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Heat the 5L high-pressure reactor to vacuumize, remove air and water, replace with nitrogen, repeat three times, and then add MgCl 2 Loaded TiCl 4Catalyst solid component 20mg, the content of Ti in the solid component is 2.36wt%, triethylaluminum add-on is Al / Ti (mol)=600, isobutyl isopropyl dimethoxysilane (IBIPDMS), 3-chloro Propyl trimethoxysilane (3-ClPTMS), the molar ratio of the two is 5: 95, the total addition amount of two kinds of silanes is calculated as Si / Ti (mol)=20 by silicon, then add 84mmol hydrogen and 1.2 kilograms of propylene , the molar ratio of hydrogen to propylene is 2.94 mmol / mol. Close the reaction kettle, raise the temperature of the kettle to 70°C, and start polymerization. After 2 hours of reaction, unreacted propylene is discharged to obtain 830g of polypropylene particles, the catalytic activity is 41.5KgPP / g catalyst, and the melt index of polypropylene is 10.7gPP / 10min , The isotacticity is 98.5%.

Embodiment 2

[0033] Heat the 5L high-pressure reactor to vacuumize, remove air and water, replace with nitrogen, repeat three times, and then add MgCl 2 Loaded TiCl 4 Catalyst solid component 20mg, the content of Ti in the solid component is 2.36wt%, the addition of triethylaluminum is Al / Ti (mol)=300, isobutylcyclohexyldimethoxysilane (IBCHDMS), 3-chloropropane Base trimethoxysilane (3-ClPTMS), the molar ratio of the two is 5: 95, and the total addition amount of two kinds of silanes is calculated as Si / Ti (mol)=20 by silicon, then adds 84mmol hydrogen and 1.2 kilograms of propylenes, The molar ratio of hydrogen to propylene was 2.94 mmol / mol. Close the reaction kettle, raise the temperature of the kettle to 70°C, and start polymerization. After 2 hours of reaction, unreacted propylene is discharged to obtain 810g of polypropylene particles, the catalytic activity is 40.5KgPP / g catalyst, and the melt index of polypropylene is 15.7gPP / 10min , The isotacticity is 98.2%.

Embodiment 3

[0035] Heat the 5L high-pressure reactor to vacuumize, remove air and water, replace with nitrogen, repeat three times, and then add MgCl 2 Loaded TiCl 4 Catalyst solid component 20mg, the content of Ti in the solid component is 2.36wt%, triethylaluminum add-on is Al / Ti (mol)=600, isobutyl isopropyl dimethoxysilane (IBIPDMS), 3-chloro Propyl triethoxysilane (3-ClPTES), the molar ratio of the two is 5: 95, the total addition amount of two kinds of silanes is calculated as Si / Ti (mol)=15 by silicon, then adds 84mmol hydrogen and 1.2 kilograms The molar ratio of propylene, hydrogen and propylene is 2.94 mmol / mol. Close the reaction kettle, raise the temperature of the kettle to 70°C, and start polymerization. After 2 hours of reaction, unreacted propylene is discharged to obtain 790g of polypropylene particles, the catalytic activity is 39.5KgPP / g catalyst, and the melt index of polypropylene is 16.2gPP / 10min , The isotacticity is 98.3%.

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Abstract

A catalyst system containing multiple external electron donors comprises a solid catalytic component (A), aluminum alkyl (B) and the multiple external electron donors (C); the component (A) which is a magnesium chloride loaded Ti solid component contains phthalate internal electron donors; the component (B) is aluminum trialkyl; the component (C) comprises a first type external electron donor anda second type external electron donor with a molar ratio of 1-70:30-99; the first type external electron donor is selected from dialkyl dimethoxy silicon, 9,9-bis(methoxymethyl)fluorene or 2,2-diisobutyl-1,3-dimethoxypropane or a mixture of above substances; and the second type external electron donor is selected from tetraethoxysilane, n-propenyltriethoxysilane, n-propyltrimethoxysilane, 3-halopropyltrimethoxysilane or 3-halopropyltriethyoxyl silicon or a mixture of above substances. In the presence of hydrogen, a proportion of a silane type external electron donor and a hydrogen adding amount can be regulated and controlled, and the MFR of polypropylene can be regulated and controlled in a range of 10 to 250 g / 10min under the condition of high catalytic activity.

Description

technical field [0001] The invention relates to a catalyst and a polymerization method for preparing high melt index polypropylene by a hydrogen adjustment method. Specifically, it relates to a catalytic system containing multiple external electron donors, and a polymerization method for preparing high melt index polypropylene under the catalytic system. Background technique [0002] Polypropylene is cost-effective and widely used. Polypropylene can be used in injection molding, extrusion, blow molding and other production processes. In injection molding and extrusion processes, in order to improve processing efficiency and prepare large injection molded parts, it is usually necessary to increase the melt index of polypropylene to meet processing requirements. In general, propylene polymerization uses MgCl 2 Prepared by supported Ziegler-Natta catalyst, adding hydrogen as a molecular weight regulator during propylene polymerization, hydrogen can reduce the molecular weight...

Claims

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Application Information

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IPC IPC(8): C08F4/649C08F4/646C08F4/02C08F10/06C08F2/38
CPCY02P20/52
Inventor 李化毅黄河李倩胡友良
Owner INST OF CHEM CHINESE ACAD OF SCI
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