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Method for preparing metallocene polypropylene catalyst

A metallocene polypropylene and metallocene compound technology, applied in the field of preparation of metallocene polypropylene catalysts, can solve the problems of increasing the production cost of polypropylene products and restricting industrial applications

Inactive Publication Date: 2018-01-09
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metallocene catalysts need to add a large amount of MAO to improve polymerization activity, which greatly increases the production cost of polypropylene products and limits its industrial application.

Method used

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  • Method for preparing metallocene polypropylene catalyst
  • Method for preparing metallocene polypropylene catalyst
  • Method for preparing metallocene polypropylene catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Accurately weigh 1 g of silica gel pretreated at 600 °C, suspend in 20 mL of toluene, add 1 mmol BF 3 solution, stirred at room temperature for 2h, and then the solid part was washed 3 times with 20mL toluene to obtain BF 3 Modified SiO 2 . Add 27mmol aluminoxane solution, stir at 50°C for 2h, then wash the solid part with 20mL toluene 3 times to obtain aluminoxane-modified SiO 2 . Then add 20ml of toluene, then add a certain amount of rac-dimethylsilanediylbis(2-methyl-4-phenylindenyl) zirconium dichloride, stir at room temperature for 2h, and wash the solid part with 20mL of toluene for 3 Once, the solvent was removed at room temperature to obtain the supported catalyst CAT3 (loaded zirconium amount: 5mgZr / gSiO 2 ).

[0052] polymerization process

[0053] 10 mmol TEA and 1200 g liquid propylene were added to a 4 L stainless steel jacketed reactor equipped with a magnetic drive stirrer and catalyst feeder. After stirring for 10 minutes, a total of 100 mg of catal...

Embodiment 2

[0055] Catalyst CAT4 preparation method is the same as embodiment 1, but adds 2mmol BF in every gram of silica gel 3 solution.

Embodiment 3

[0057] Accurately weigh 1 g of silica gel pretreated at 600 °C, suspend in 20 mL of toluene, add 2 mmol BF 3 solution, stirred at room temperature for 2h, and then the solid part was washed 3 times with 20mL toluene to obtain BF 3 Modified SiO 2 . Add 27mmol aluminoxane solution, stir at 50°C for 2h, then wash the solid part with 20mL toluene 3 times to obtain aluminoxane-modified SiO 2 . Then add 20ml of toluene, and then add a certain amount of rac-CH 2 (2-tert-butyl-1-indenyl) 2 ZrMe 2 , stirred at room temperature for 2h, the solid part was washed 3 times with 20mL toluene, and the solvent was removed at room temperature to obtain the supported catalyst CAT5 (zirconium loading: 5mgZr / gSiO 2 ).

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Abstract

The invention relates to a polypropylene catalyst, in particular to a method for preparing a metallocene polypropylene catalyst. The method comprises the following steps of: adding a carrier materialinto a contact container under a condition of nitrogen protection, adding solvent so as to disperse the carrier material, adding a carrier modifier into the contact container so as to enable the carrier modifier to react with the carrier material, and then washing reactants with the solvent; adding a cocatalyst into the contact container so as to carry out a reaction with the carrier material, andthen washing reactants with the solvent; dissolving a metallocene compound in the solvent, adding the obtained solution of the metallocene compound to the contact container so as to enable the metallocene compound to react with the carrier material, then washing reactants with the solvent, and conducting heating and drying on the obtained reactants to obtain the metallocene polypropylene catalyst. The invention provides the method for preparing the metallocene polypropylene catalyst, through the prepared metallocene polypropylene catalyst, the activity of polymerization of alkene can be improved, and the production cost of a polymerization product can be reduced.

Description

technical field [0001] The invention relates to a polypropylene catalyst, in particular to a preparation method of a metallocene polypropylene catalyst. Background technique [0002] In industrial production, it is hoped that the activity of metallocene catalysts can be improved to reduce the production cost of olefin polymerization. Typically, one or more catalytic components can be supported on a porous support. Usually the metallocene is deposited onto the support in the solution state. At the same time, or separately, an activator, such as methylaluminoxane (MAO) and / or an alkylaluminum compound and / or an ionizing activator, is also deposited on the support. The catalyst may be dissolved in one or more liquid monomers, or in a solvent containing one or more monomers. The monomers used can be polymerized during impregnation of the support or evaporation of the solvent. [0003] Zhang Puyu et al. (Chemical Research, 2003, 14(3): 21-23) provided a method for preparing a...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F110/06C08F4/6592C08F4/02
Inventor 李留忠李功韬周建勇严婕朱卫东
Owner CHINA PETROLEUM & CHEM CORP
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