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Catalyst component for ethylene polymerization, preparation method and application

An ethylene polymerization and catalyst technology, which is applied to the catalyst components, preparation and application fields for ethylene polymerization, can solve the problems of a large number of fine powders, reduce the molecular weight distribution of polyethylene resin, and be easily broken, and achieve high bulk density and high co-polymerization. Polymerization catalytic activity, low content effect

Active Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] CN200780043013.5 uses α, ω-diether compound to prepare polyethylene catalyst, which can obviously reduce the molecular weight distribution of polyethylene resin, but this catalyst uses spherical magnesium chloride as carrier, because the magnesium chloride carrier is easily broken during the polymerization process, it will cause a lot of fine particles. pink

Method used

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  • Catalyst component for ethylene polymerization, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1) Preparation of magnesium chloride / silica gel carrier (prepared according to the method of Chinese patent application 200710176589)

[0058] Under nitrogen protection, in a glass reactor, 1.04 g of anhydrous magnesium chloride was added at room temperature, then 700 ml of dried tetrahydrofuran was added, and after stirring was started, 2.42 g of silica gel (GRACE Sylopol 2485, under nitrogen, was roasted at 150° C. for 2.5 hours. Heat up to 300°C for 2 hours, then bake at 600°C for 5 hours) into the reactor, raise the temperature to 65°C, stir and dissolve for 2 hours, then evaporate the solvent at 80°C to obtain a white solid powder. The white solid powder was vacuum-dried at 100° C. for 2 hours, and then vacuum-dried at 300° C. for 10 hours to obtain 3.40 g of solid powder with good fluidity. According to gas chromatography analysis, no tetrahydrofuran was detected.

[0059] 2), the preparation of catalyst component A

[0060] 0.928 grams (2.93mmolMgCl) of magnesiu...

Embodiment 2

[0062] Preparation of Catalyst Component B

[0063] 1.161 grams (3.67 mmol) of the magnesium chloride / silica gel carrier obtained by the preparation method in Example 1 was added to 30 milliliters of hexane under nitrogen protection, and heated to 70° C. for 0.5 hours under stirring, and then added 0.33 milliliters of normal butanol, stirred for 0.5 hour, removed the supernatant, added 30 ml of hexane to the reaction flask, and added 1.75 ml of TiCl with stirring 4 , heated to 70°C and stirred for 1 hour, lowered to room temperature, added 0.30 milliliters (1.91 mmol) of 1,5 dimethoxypentane, raised to 50.0°C for 2 hours, then removed the supernatant, and the solid was washed with ethyl alcohol Wash with alkane solvent for 3 times until the mother liquor in the upper layer is colorless, and dry it with nitrogen at 50°C until it becomes fluid to obtain the solid B catalyst component. After analysis, the Ti content was 6.0%wt.

Embodiment 3

[0065] Preparation of Catalyst Component C

[0066] 0.660 g (2.08 mmol) of the magnesium chloride / silica gel carrier obtained by the preparation method in Example 1 was added to 30 ml of hexane under nitrogen protection, and heated to 70° C. for 0.5 hour reaction under stirring, and then 0.19 ml of normal butanol, stirred for 0.5 hours, removed the supernatant, added 30 ml of hexane to the reaction flask, and added 1.0 ml of TiCl with stirring 4 , heated to 70°C and stirred for 1 hour, lowered to room temperature, added 0.34 ml (2.13 mmol) of 1,5 dimethoxypentane, raised to 50.0°C for 2 hours, then took off the supernatant, and the solid was washed with ethyl alcohol Wash with alkane solvent for 3 times until the mother liquor in the upper layer is colorless, and dry it with nitrogen gas at 50°C until it is in a fluid state to obtain a solid C catalyst component. After analysis, the Ti content was 9.6%wt.

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Abstract

The invention relates to a Ziegler-Natta catalyst component which comprises a Ti compound, MgCl2, silica gel, and alpha, omega-diether compound. The catalyst system has a relatively high catalytic activity when used for ethylene copolymerization, the obtained polyethylene is relatively narrow in molecular weight distribution, and polymer particles contain low fine powder.

Description

technical field [0001] The invention relates to a Ziegler-Natta catalyst component for preparing polyethylene with narrow molecular weight distribution, its preparation method, and its application in olefin polymerization. technical background [0002] Molecular weight distribution is an important index of resin, which has a certain influence on the use performance and processing performance of the product. In order to improve the performance of polyethylene and expand its application fields, people continue to develop new polyethylene products with different molecular weight distributions to meet the needs of polyethylene resins in different fields. [0003] The metallocene catalyst is a single-site catalyst that can produce polyethylene with a narrow molecular weight distribution. Due to its significantly reduced oligomer content, the odor generated during resin processing is reduced, and the material properties are significantly improved, but the metallocene catalyst The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/658C08F4/656C08F4/654C08F4/649C08F4/646C08F4/02
Inventor 刘东兵袁海朋李岩高榕廖浩瀚黄廷杰周俊领王洪涛
Owner CHINA PETROLEUM & CHEM CORP
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