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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AI-Extracted Technical Summary

Problems solved by technology

The combination of diether and siloxane can also achieve the purpose of regulating the isotacticity, molecular weight...

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.

Application Domain

Bulk chemical production

Technology Topic

Tetraethyl orthosilicatePolypropylene +13

Examples

Experimental program(17)
Comparison scheme(3)

Example Embodiment

[0030] Example 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%.

Example Embodiment

[0032] Example 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%.

Example Embodiment

[0034] Example 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%.

PUM

Property	Measurement	Unit
Melt index	107.0	g
Isotacticity	0.107 ~ 0.985
Isotacticity	0.157 ~ 0.982

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