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Polyethylene catalyst component with narrow molecular weight distribution, preparation method and application

A technology of narrow molecular weight distribution and catalyst, which is applied in the field of narrow molecular weight distribution polyethylene catalyst components, preparation and application, can solve the problems of high cost of loading, low catalyst activity and reduction, etc., and achieve the goal of reducing molecular weight distribution and high bulk density Effect

Active Publication Date: 2014-08-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 cost of loading is relatively expensive, and the activity of the loaded catalyst is low, which limits its application to a certain extent

Method used

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  • Polyethylene catalyst component with narrow molecular weight distribution, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1) Preparation of magnesium chloride / silica gel carrier (prepared according to the method of Chinese patent application 200710176589)

[0057] Under nitrogen protection, in a glass reactor, add 1.04 grams of anhydrous magnesium chloride at room temperature, then add 700 milliliters of dried tetrahydrofuran, start stirring, and 2.42 grams of silica gel (GRACESylopol 2485, under nitrogen, roast at 150 ° C for 2.5 hours, heat up to 300°C for 2 hours, then at 600°C for 5 hours) into the reactor, heated to 65°C, stirred and dissolved for 2 hours, then evaporated at 80°C to remove the solvent 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.

[0058] 2), the preparation of catalyst component A

[0059] 0.683 grams (2.15mmolMgCl) of magnesium chloride / silica g...

Embodiment 2

[0061] Preparation of Catalyst Component B

[0062] 0.648 grams (2.05 mmol) of magnesium chloride / silica gel carrier obtained with the preparation method in Example 1, under nitrogen protection, was added in 30 milliliters of hexanes, under stirring, was heated to 70 ℃ and reacted for 0.5 hours, then added 0.18 milliliters of normal butanol, stirred for 0.5 hour, removed the supernatant, added 30 milliliters of hexane to the reaction flask, and added 0.98 milliliters of TiCl under stirring. 4 , heated to 70°C and stirred for 1 hour, lowered to room temperature, added 0.630 ml (8.04 mmol) of epichlorohydrin, raised to 50.0°C for 2 hours, then removed the supernatant, and washed the solid with hexane solvent for 3 times When the mother liquor in the upper layer was colorless, it was blown dry with nitrogen gas at 50° C. until it was in a fluid state to obtain a solid B catalyst component. After analysis, the Ti content was 3.78%wt.

Embodiment 3

[0064] Preparation of Catalyst Component C

[0065] 0.737 grams (2.33 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, then added 0.21 milliliters of normal butanol, stirred for 0.5 hours, removed the supernatant, added 30 ml of hexane to the reaction flask, and added 1.11 ml of TiCl 4 , heated to 70°C and stirred for 1 hour, lowered to room temperature, added 1.430 ml (18.2 mmol) of epichlorohydrin, raised to 50.0°C for 2 hours, then took off the supernatant, and washed the solid for 3 times with hexane solvent When the mother liquor in the upper layer was colorless, it was blown dry with nitrogen gas at 50°C until it was in a fluid state to obtain a solid C catalyst component. After analysis, the Ti content was 3.80%wt.

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Abstract

The invention relates to a Ziegler-Natta catalyst component which comprises a Ti compound, MgCl2, silica gel, and halogenated alkylene oxide. The catalyst has a relatively high activity when used for ethylene polymerization or copolymerization, and can produce polyethylene resin with relatively narrow molecular weight distribution.

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 Patents(China)
IPC IPC(8): C08F110/02C08F210/02C08F4/646C08F4/658C08F4/654C08F4/656
CPCY02P20/52
Inventor 刘东兵袁海朋廖浩瀚高榕李岩黄廷杰周俊领王洪涛
Owner CHINA PETROLEUM & CHEM CORP
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