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Preparation method of 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 limiting industrial applications and increasing the production cost of polypropylene products

Active Publication Date: 2021-02-26
CHINA PETROLEUM & CHEM CORP +1
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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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  • Preparation method of metallocene polypropylene catalyst
  • Preparation method of metallocene polypropylene catalyst
  • Preparation method of metallocene polypropylene catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049]In the catalyst preparation bottle under the protection of nitrogen, add 27mmol MAO toluene solution (10wt%), then add 34.7mg dimethylsilyl bis(2-methyl-4-phenylindenyl) zirconium dichloride, use ultrasonic For treatment, the ultrasonic frequency is 20KHz and the mixture is stirred for 2h at room temperature. Add 1g of silica gel pretreated at 600℃ and 20mL of toluene accurately weighed into the catalyst preparation bottle, stir at 50℃ for 2h, wash the solid part with 20mL of toluene 3 times, remove the solvent at room temperature to obtain the supported catalyst CAT4.

Embodiment 2

[0051]In the catalyst preparation bottle under the protection of nitrogen, add 27mmol MAO toluene solution (10wt%), then add 34.7mg dimethylsilyl bis(2-methyl-4-phenylindenyl) zirconium dichloride, use ultrasonic For treatment, the ultrasonic frequency was 40KHz and the mixture was stirred at room temperature for 2h. Add 1g of silica gel pretreated at 600℃ and 20mL of toluene accurately weighed into the catalyst preparation bottle, stir at 50℃ for 2h, wash the solid part with 20mL of toluene 3 times, and remove the solvent at room temperature to obtain the supported catalyst CAT5.

Embodiment 3

[0053]In the catalyst preparation bottle under the protection of nitrogen, add 27mmol MAO toluene solution (10wt%), and then add 34.7mg dimethylsilyl bis(2-methyl-4-phenylindenyl) zirconium dichloride, using ultrasound For treatment, the ultrasonic frequency is 60KHz and the mixture is stirred for 2h at room temperature. Add 1g of silica gel pretreated at 600℃ and 20mL of toluene accurately weighed into the catalyst preparation bottle, stir at 50℃ for 2h, wash the solid part with 20mL of toluene 3 times, remove the solvent at room temperature to obtain the supported catalyst CAT6.

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Abstract

The invention relates to a polypropylene catalyst, in particular to a preparation method of a metallocene polypropylene catalyst. The preparation method comprises the following steps: (1) adding a cocatalyst and a metallocene compound into a contact container, and carrying out ultrasonic treatment to obtain a catalyst precursor; (2) adding the carrier material into the contact container under theprotection of nitrogen, and adding a solvent to disperse the carrier material; and (3) dissolving the catalyst precursor obtained in the step (1) in a solvent, adding into a contact container to reactwith a carrier material, washing a reactant by using the solvent, and heating and drying to obtain the polypropylene catalyst. The catalyst prepared in the invention has high olefin polymerization catalysis activity, the production cost of a polymerization product is reduced, and the isotacticity of polypropylene is improved.

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, people hope to increase the activity of the metallocene catalyst to reduce the production cost of olefin polymerization. Generally, one or more catalytic components can be supported on a porous support. Usually the metallocene is deposited on the support in a solution state. At the same time, or separately, an activator such as methylaluminoxane (MAO) and / or an alkyl aluminum compound and / or an ionizing activator is also deposited on the support. The catalyst can be dissolved in one or more liquid monomers, or in a solvent containing one or more monomers. The monomers used can undergo polymerization during the impregnation of the carrier or the evaporation of the solvent.[0003]Zhang Puyu et al. (Chemical Research, 2003, 14(3): 21-23) provided a method for preparing a metallocene catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F4/6592
CPCC08F110/06C08F2500/15C08F4/65927Y02P20/52
Inventor 李功韬严婕周建勇朱卫东裴小静李晓庆鲍春伟徐晓范大鹏
Owner CHINA PETROLEUM & CHEM CORP
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