A catalyst component for ethylene polymerization, its preparation method and application

A technology for ethylene polymerization and catalysts, which is applied in the field of supported chromium-based catalyst components, and can solve problems such as undisclosed chromium-based catalyst systems

Active Publication Date: 2019-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no chromium-based catalyst system disclosed in the prior art, which has good activity during polymerization and can obtain polymers with a wide molecular weight distribution

Method used

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  • A catalyst component for ethylene polymerization, its preparation method and application
  • A catalyst component for ethylene polymerization, its preparation method and application
  • A catalyst component for ethylene polymerization, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take 10g silica gel (W.R.Grece&Co.–Com 955, the pore volume is about 1.1-1.8cm 3 / g, the surface area is about 245-375m 2 / g) Dry at 200°C for 4 hours under nitrogen fluidization. Add 0.5 g of bis(triphenylsilyl) chromate to the reactor fully replaced with anhydrous and oxygen-free nitrogen, and then add 300 ml of hexane, and stir at room temperature to completely dissolve the solid to form a solution. Add 10g of dried silica gel to the above solution. After stirring, add 2ml (1.3M) diethyl aluminum ethoxide in hexane. After stirring for 1 hour at room temperature, add 2.4mmol of 4,4'-di (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)biphenyl was stirred at room temperature for 1 hour and the solvent was removed to obtain a chromium-containing catalyst component. The polymerization evaluation results of the catalyst are shown in Table 1.

Embodiment 2

[0049] Take 10g silica gel (W.R.Grece&Co.–Com 955, the pore volume is about 1.1-1.8cm 3 / g, the surface area is about 245-375m 2 / g) Dry at 200°C for 4 hours under nitrogen fluidization. Add 0.5 g of bis(triphenylsilyl) chromate to the reactor fully replaced with anhydrous and oxygen-free nitrogen, and then add 300 ml of hexane, and stir at room temperature to completely dissolve the solid to form a solution. Add 10g of dried silica gel to the above solution. After stirring, add 2.4mmol of 4,4'-bis(4,4,5,5-tetramethyl-1,3,2-dioxole Alk-2-yl) biphenyl, after stirring at room temperature for 1 hour, add 2ml (1.3M) diethyl aluminum ethoxide in hexane solution, after stirring at room temperature for 1 hour, remove the solvent to obtain a chromium-containing catalyst component. The polymerization evaluation results of the catalyst are shown in Table 1.

Embodiment 3

[0051] Take 10g silica gel (W.R.Grece&Co.–Com 955, the pore volume is about 1.1-1.8cm 3 / g, the surface area is about 245-375m 2 / g) Dry at 200°C for 4 hours under nitrogen fluidization. Add 0.5 g of bis(triphenylsilyl) chromate to the reactor fully replaced with anhydrous and oxygen-free nitrogen, and then add 300 ml of hexane, and stir at room temperature to completely dissolve the solid to form a solution. The dried 10g silica gel was added to the above solution, and after stirring, 2ml (1.3M) hexane solution of diethyl aluminum ethoxide and 2.4mmol of 4,4'-bis(4,4,5,5 -Tetramethyl-1,3,2-dioxaborolan-2-yl)biphenyl, stirred at room temperature for 2 hours and then removed the solvent to obtain a chromium-containing catalyst component. The polymerization evaluation results of the catalyst are shown in Table 1.

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Abstract

The invention provides a catalyst component used for ethylene polymerization, which comprises a chromium compound, an organic aluminum compound and an organic boron compound loaded on a carrier, and the organic boron compound contains a B-R0-B structure. The invention also provides a preparation method of the catalyst component, and an ethylene polymerization catalyst based on the catalyst component, the catalyst has good polymerization activity when used for ethylene homopolymerization or ethylene and alpha-alkene copolymerization, and can obtain the polyethylene with wide molecular weight distribution.

Description

Technical field [0001] The invention relates to a supported chromium catalyst component, a preparation method of the catalyst component and its application in ethylene polymerization. Background technique [0002] Ethylene polymers have been widely used in various products, and ethylene polymers are required to have different characteristics according to processing methods and purposes. For example, polymers with lower molecular weight and narrow molecular weight distribution are suitable for products made by injection molding films. On the other hand, polymers with higher molecular weight and broad molecular weight distribution are suitable for products made by blow molding or air-filled film production. In many applications (such as pipe applications) medium to high molecular weight polyethylene is required. Such polyethylene should have sufficient strength and good processing properties. [0003] Ethylene polymers with broad molecular weight distribution can be prepared using ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F4/69C08F10/02
Inventor 崔楠楠王洪涛周俊领闫力欣万艳红刘树军
Owner CHINA PETROLEUM & CHEM CORP
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