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Preparation method for novel metallocene polypropylene catalyst

A metallocene polypropylene and catalyst technology, applied in the production of bulk chemicals, etc., can solve problems such as increasing the production cost of polypropylene products and restricting industrial applications.

Inactive Publication Date: 2019-02-26
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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  • Preparation method for novel metallocene polypropylene catalyst
  • Preparation method for novel metallocene polypropylene catalyst
  • Preparation method for novel metallocene polypropylene catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Accurately weigh 1 g of silica gel pretreated at 600°C, suspend it in 20 ml of toluene, and add 1 mmol of BF 3 The solution was stirred at room temperature for 2 h, and then the solid part was washed three times with 20 ml of toluene. get BF 3 Modified SiO 2 . Add 27 mmol MAO solution, stir at 50 °C for 2 h, and then wash the solid part with 20 ml of toluene 3 times to obtain MAO-modified SiO 2 . Add 20ml of toluene, then add dimethylsilanediylbis(2-methyl-4-phenylindenyl)zirconium dichloride and dimethylsilanediylbisindenylzirconium dichloride in an equimolar ratio. Stir at room temperature for 2h, the solid part is washed 3 times with 20ml of toluene, and the solvent is removed at room temperature to obtain a supported catalyst CAT4 (zirconium load: 5mgZr / gSiO 2 ).

Embodiment 2

[0057] Accurately weigh 1 g of pretreated silica gel at 600°C, suspend it in 20 ml of toluene, and add 2 mmol of BF 3 The solution was stirred at room temperature for 2h, and then the solid part was washed three times with 20ml of toluene to obtain BF 3 Modified SiO 2. Add 27 mmol MAO solution, stir at 50 °C for 2 h, and then wash the solid part with 20 ml of toluene 3 times to obtain MAO-modified SiO 2 . Add 20ml of toluene, then add dimethylsilanediylbis(2-methyl-4-phenylindenyl)zirconium dichloride and dimethylsilanediylbisindenylzirconium dichloride in an equimolar ratio. Stir at room temperature for 2 h, wash the solid part with 20 ml of toluene 3 times, and remove the solvent at room temperature to obtain a supported catalyst CAT5 (zirconium loading: 5 mgZr / gSiO) 2 ).

[0058] Aggregation process

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Abstract

The invention relates to a preparation method for a novel metallocene polypropylene catalyst. The preparation method comprises the following steps: (a) adding a dehydrated granular porous carrier material into a solvent for dispersion under the condition of nitrogen protection; (b) adding a carrier modifier, reacting the carrier modifier with the porous carrier material at -20 to 100 DEG C for 0.1to 48 h, and then washing a reaction product with a solvent; (c) adding a cocatalyst, reacting the cocatalyst with the porous carrier material at -20 to 200 DEG C for 0.1 to 48 h, and then washing areaction product with a solvent; (d) dissolving two metallocene compounds in a solvent, adding the solved compounds into a mixture obtained in the previous steps, and then carrying out a reaction withthe porous carrier material at -20 to 200 DEG C for 0.1 to 48 h. The catalyst prepared in the invention has high activity in catalyzing olefin polymerization and reduces the production cost of a polymerization product. According to the invention, the relative molecular mass of a polymer is increased; slurry and gas-phase polymerization are performed after loading of the catalyst; and conventionalindustrial apparatuses for olefin polymerization can be fully utilized.

Description

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

Claims

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Application Information

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IPC IPC(8): C08F110/06C08F4/6592C08F4/02
CPCC08F4/025C08F4/65927C08F110/06C08F2410/01C08F2420/01Y02P20/52
Inventor 李功韬李留忠周建勇严婕朱卫东
Owner CHINA PETROLEUM & CHEM CORP
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