External electron donor component, alkene polymerization catalyst containing external electron donor component and application thereof

An external electron donor and olefin polymerization technology, which is applied in the application field of tactic polypropylene, random copolymer polypropylene and impact-resistant copolymer polypropylene, can solve the problems of inconvenience, low ethylene content, poor product performance, etc., and achieve product Excellent performance, high ethylene content, high isotactic effect

Inactive Publication Date: 2013-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In patent EP0385765, Mitsui Chemicals uses equimolar compounded dicyclopentyldimethoxysilane (DCPDMS, referred to as DCP) and propyltriethoxysilane to prepare high flow and wide distribution PP, and discusses in patent EP0601496 How to use compound external electron donors in industrial devices, proposed to use a single external electron donor in two polymerization tanks, and then put the polymers in these two polymerization tanks into a larger tank for polymerization, which can be PP with high flow and wide distribution is obtained on industrial devices, but this method has many inconveniences in practical application
[0005] Lei Hua et al studied the catalytic system using a mixture of tetraethoxysilane (TEOS) and DCP or diisobutyldimethoxysilane (DIBDMS, DIB for short) as an external electron donor in the domestic patent CN101735351A. Or when DIB accounts for 0.1~10% of the total molar weight of the mixture, a polypropylene product with high flow and wide molecular weight distribution is prepared, but the ethylene content in the copolymerization product of this catalytic system is low, and the product performance is poor

Method used

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  • External electron donor component, alkene polymerization catalyst containing external electron donor component and application thereof
  • External electron donor component, alkene polymerization catalyst containing external electron donor component and application thereof
  • External electron donor component, alkene polymerization catalyst containing external electron donor component and application thereof

Examples

Experimental program
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Embodiment 1

[0021] This embodiment is carried out in a 10L high-pressure polymerization kettle, and the reaction temperature and stirring speed are controlled by the DCS system. Firstly, the polymerization tank is purged with nitrogen, then components A, B, and C in the catalyst are added to the catalyst feeder under the protection of nitrogen, and the liquid propylene pressurized by the diaphragm pump is brought into the polymerization tank, and measured with an electronic balance. Control the excess of propylene to ensure that there is still propylene monomer in the reactor when the reaction ends. Then, hydrogen gas is introduced, and the hydrogen gas is measured by pressure difference. After the material is added, the temperature is raised rapidly, the temperature is controlled at 70±0.1°C, the stirring speed is 240 rpm, and the polymerization reaction time is 60 minutes. Finally, open the feeding valve to release the material, dry the material, weigh it, and analyze and test it. The s...

Embodiment 1-0

[0027] Example 1-0, the catalyst ratio is Al / Ti=100 / 1 (mol / mol), Si / Ti=10 / 1 (mol / mol), and the amount of hydrogen added is 5L;

[0028] Example 1-1, the catalyst ratio is Al / Ti=100 / 1 (mol / mol), Si / Ti=10 / 1 (mol / mol), and the amount of hydrogen added is 10L;

Embodiment 1-2

[0029] Example 1-2, the catalyst ratio is Al / Ti=100 / 1 (mol / mol), Si / Ti=5 / 1 (mol / mol), and the amount of hydrogen added is 15L;

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PUM

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Abstract

The invention relates to an external electron donor component and an alkene polymerization catalyst containing the external electron donor component, and also relates to an application of the alkene polymerization catalyst in preparation of isotactic polypropylene, polypropylene randon copolymer and impact resistance copolymerization polypropylene. The external electron donor component is composed of isobutyl triethoxysilane and diisobutyldimethoxysilane or dicyclopentyl dimethoxyl silane, and isobutyl triethoxysilane accounts for 80-98% of total mole of the external electron donor component. The alkene polymerization catalyst is composed of a component A, a component B and a component C, the component A is a titanium catalyst component, the component B is an aluminum alkyl compound, and the component C is the external electron donor component of the invention, the mol ratio of aluminum in the component B to silicon in the component C to titanium in the component A is 20-250:1, and the mol ratio of Si to Ti is 1-50:1. The catalyst of the invention has high hydrogen modulation sensitivity and higher stereoregularity adjusting performance, and the ethene content in the copolymerization product is high.

Description

technical field [0001] The present invention relates to an external electron donor component and an olefin polymerization catalyst containing the external electron donor component, and also relates to the use of the olefin polymerization catalyst in the preparation of isotactic polypropylene, random copolymer polypropylene and impact-resistant copolymer polypropylene Applications. Background technique [0002] Polypropylene (PP) is mainly produced by liquid-phase bulk polymerization, gas-phase polymerization, solution polymerization or various combinations of these polymerization forms, and specifically different production devices can be used. The catalyst system used generally consists of a Ziegler-Natta type catalyst component, an aluminum alkyl compound and an external electron donor. The role of the external electron donor is to selectively suppress or transform the non-stereotactic active sites present on the surface of the solid catalyst, thereby improving the isotac...

Claims

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Application Information

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IPC IPC(8): C08F10/00C08F4/646C08F10/06
Inventor 李栋王兴仁徐宏彬笪文忠柏基业
Owner CHINA PETROLEUM & CHEM CORP
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