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Propylene polymerized catalyst system, preparationmethod and usage

A technology for propylene polymerization and catalyst, applied in the field of preparation of catalytic system, can solve the problems of decreased activity, complicated polymerization process and the like

Inactive Publication Date: 2004-10-27
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a catalyst system for propylene polymerization, which overcomes the need to use external electron donors in order to obtain high-isotactic polymers in the prior art, resulting in decreased activity and complicated polymerization processes. The disadvantages; the catalyst is prepared by adding a new type of 1,3-diether, and it does not need to add an external electron donor during polymerization, which shows high activity and stereospecificity, which simplifies the production process

Method used

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  • Propylene polymerized catalyst system, preparationmethod and usage
  • Propylene polymerized catalyst system, preparationmethod and usage
  • Propylene polymerized catalyst system, preparationmethod and usage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Catalyst preparation

[0078] Add 4.3 grams of microspherical magnesium chloride alcoholate particles to 140 ml of titanium tetrachloride liquid at -20°C, react for 1.5 hours, slowly heat up to 40°C and add 0.5 grams of 1,1-bis(methoxymethane Base)-cyclobutane, reacted at 120°C for 2 hours, filtered, then added 140 ml of titanium tetrachloride, reacted at 120°C for 2 hours, filtered, washed five times with 100 ml of hexane at 60°C, and washed with 100 milliliters of hexane was washed once, and the magnesium chloride supported catalyst was obtained after vacuum drying. The above operations were all completed under anhydrous and oxygen-free conditions.

[0079] slurry polymerization

[0080] In 250 milliliters of vacuum-dried reaction flasks fully replaced with nitrogen and propylene gas, add 100 milliliters of anhydrous and anaerobic-treated heptane, keep the pressure in the bottle at 1 atmosphere, and keep the temperature at 40 ° C. Add the alkylaluminum solution, sti...

Embodiment 2

[0082] Except that when preparing the procatalyst, the amount of 1,1-bis(methoxymethyl)-cyclobutane was changed from 0.5 gram to 0.75 gram, others were the same as in Example 1.

[0083] The aggregated relevant data are listed in Table 1.

Embodiment 3～5

[0085] According to the polymerization method of embodiment 1, the molar ratio of the titanium in the main catalyst and the aluminum in the cocatalyst is respectively 1: 40 / 20 / 100, and other are identical with embodiment 1.

[0086] The aggregated relevant data are listed in Table 1.

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Abstract

A catalyst system for the polymerization of propylene is composed of primary catalyst and secondary catalyst which is alkyl aluminium compound. Said primary catalyst is prepared through reaction between microspheric magnesium chloride-alcohol addition, titanium halide solution and 1,3-diether, filtering, washing and drying. Its advantages are high activity and high stereostructure regularity.

Description

technical field [0001] The present invention relates to a catalytic system for the polymerization of propylene. [0002] The invention also relates to a process for the preparation of a catalytic system for the polymerization of propylene. Background technique [0003] In the past ten years, the research on catalysts used in olefin polymerization has made great progress, and the performance of the produced catalysts has also been continuously improved. At the same time, the requirements for polymer processability are getting higher and higher, which requires better polyolefin catalysts. [0004] US 4298718 describes this type of catalyst for the first time, which catalyst is formed by supporting titanium tetrachloride on active magnesium halide. Although the catalyst is highly active in propylene polymerization, it is not very stereospecific. [0005] In GB 2111066, a homogeneous solution of magnesium chloride alcoholate is contacted with a liquid titanium compound, and a...

Claims

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Application Information

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IPC IPC(8): C08F4/645C08F10/06
Inventor 胡友良崔楠楠张志成
Owner INST OF CHEM CHINESE ACAD OF SCI
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