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
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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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