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Catalyst composition for preparing polypropylene with high melt index, preparation method and application thereof

A technology of high melt index and catalyst, which is applied in the field of preparing high melt index polypropylene catalyst composition and preparing high melt index polypropylene, and can solve the problems such as poor effect

Active Publication Date: 2011-09-07
DATANG INT CHEM TECH RESINST
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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 melt index (MFR) of polypropylene (US5869418), but its effect is not as obvious as that of the combination of two silanes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 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)=600, adds 30mmol hydrogen, isobutyl isopropyl dimethoxysilane (IBIPDMS) , n-propyltrimethoxysilane (NPTMS), the molar percentage of the two is 5: 95, and the total add-on of two kinds of silanes is calculated as Al / Si (mol)=20 by silicon, then adds hydrogen and 1.2 kilograms of propylene, 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 830g of polypropylene particles. The calculated catalytic activity is 41.5KgPP / g catalyst, and the melt index of polypropylene is 10.7gPP / 10min, the isotacticity of polypropylene is 9...

Embodiment 2

[0039] 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, adds 30mmol hydrogen, isobutylcyclohexyldimethoxysilane (IBCHDMS), N-propyltrimethoxysilane (NPTMS), the molar percentage of the two is 5: 95, and the total addition amount of two kinds of silanes is calculated as Al / Si (mol)=20 by silicon, then adds hydrogen and 1.2 kilograms of propylene, hydrogen The molar ratio to propylene is 2.94 mmol / mol. Close the reactor, 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 / After 10 minutes, the isotacticity of polypropylene is 98.1%.

Embodiment 3

[0041] 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)=600, adds 30mmol hydrogen, isobutyl isopropyl dimethoxysilane (IBIPDMS) , n-propyltriethoxysilane (NPTES), the molar percentage of the two is 5:95, and the total addition amount of the two silanes is calculated as Al / Si (mol)=20 according to silicon, and then hydrogen and 1.2 kilograms of propylene are added , the molar ratio of hydrogen to propylene is 2.94 mmol / mol. Close the reactor, 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 16.2gPP / After 10 minutes, the isotacticity of polyp...

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Abstract

The invention discloses a catalyst composition for preparing polypropylene with high melt index, which is characterized by comprising the following components: (a) MgCl2-loaded TiCl4 type Ziegler-Natta catalyst which contains a diester internal electron donor; (b) a trialkyl aluminum compound; (c) isobutyl isopropyl dimethoxy silane and / or isobutyl cyclohexyl dimethoxy silane; and (d) n-propyl trimethoxy silane and / or n-propyl triethoxy silane. The catalyst composition can be used to catalyze propylene to polymerize to generate the polypropylene with high melt index in the presence of hydrogen. In addition, the invention further discloses a method for preparing the polypropylene with high melt index from the catalyst composition and the application of the catalyst composition.

Description

technical field [0001] The invention belongs to the technical field of material preparation and catalytic application, in particular, the invention relates to a catalyst composition for preparing high melt index polypropylene, a method for preparing high melt index polypropylene by using the catalyst composition and the Use of the catalyst composition. Background technique [0002] Polypropylene (PP) is cost-effective and widely used. When polypropylene is used in production processes such as injection molding, extrusion, blow molding, etc., in order to improve processing efficiency and be able to prepare large injection molded parts, it is usually necessary to increase the melt index of polypropylene to meet processing requirements. Generally use MgCl 2 The supported Ziegler-Natta catalyst carries out the polymerization of propylene to produce polypropylene, and hydrogen is added as a molecular weight regulator during the polymerization of propylene. Hydrogen can reduce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F4/646
Inventor 李春启李化毅李金阁李倩黄河忻仕河胡友良邱波
Owner DATANG INT CHEM TECH RESINST
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