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A catalyst for the polymerization of olefins

A technology for olefin polymerization and catalyst, which is applied in the field of olefin polymerization catalyst system and can solve problems such as different polymer properties

Active Publication Date: 2017-07-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many compounds are known to act as external electron donors, the use of different external electron donor compounds for a particular catalyst may result in different polymer properties

Method used

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  • A catalyst for the polymerization of olefins
  • A catalyst for the polymerization of olefins
  • A catalyst for the polymerization of olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1A, preparation of titanium-containing solid catalyst component A

[0044] Add 100ml of titanium tetrachloride to a 300ml stirring glass reaction bottle fully replaced by high-purity nitrogen, cool to -20°C, add spherical magnesium chloride alcoholate (see Chinese patent CN1330086A for the preparation method), and slowly raise the temperature in stages To 110°C, add 3.9mmol of dibutyl phthalate during the heating process, and keep the temperature at 110°C for 0.5h, filter off the liquid, add titanium tetrachloride to treat twice, then wash with hexane five times, and vacuum dry Finally, the titanium-containing solid catalyst component A (main catalyst) is obtained.

[0045] 1B. Polymerization of propylene

[0046] In a 5-liter autoclave, use a nitrogen stream to purge at 70°C for 1 hour, then replace the polymerization vessel 3 times with gas-phase propylene, and introduce 5 ml of a hexane solution of triethylaluminum (triethylaluminum) under nitrogen protection. The ...

Embodiment 2～35

[0048] The solid catalyst prepared in 1A of Example 1 was polymerized according to the method of propylene polymerization in 1B of Example 1, respectively according to different hydrogenation amounts, different external electron donor additions, different polymerization temperatures and other conditions. The external electron donor added during the polymerization is a hexane solution of alkene-based trihydrocarbyloxysilane, and the polymerization and test results are shown in Table 1 and Table 2.

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Abstract

The present invention relates to a catalyst for the polymerization of olefins, in which an olefin-based trihydrocarbyloxysilane compound is added as an external electron donor to a titanium-containing solid spherical catalyst component that uses a carboxylate compound as an internal electron donor when olefins are polymerized Compounds can greatly improve the hydrogen adjustment sensitivity of the catalyst, and at the same time, the isotactic index of the obtained polymer decreases very little when the amount of hydrogen added is high.

Description

technical field [0001] The present invention relates to a catalyst for the polymerization of olefins, more particularly to a spherical catalyst component containing a titanium compound, the internal electron donor being a carboxylate, a co-catalyst and an external electron donor compound being an olefinic group Catalyst systems for olefin polymerization with trihydrocarbyloxysilanes. [0002] technical background [0003] Catalysts comprising titanium compounds and electron donor compounds supported on active magnesium halides are well known in the art. The catalyst system used in the homopolymerization or copolymerization of α-olefins generally consists of three parts, which are: (1) main catalyst (solid catalyst), (2) cocatalyst (usually an alkyl aluminum compound) and ( 3) External electron donor compound added during polymerization. [0004] The transition metal in the main catalyst is usually a compound of titanium, zirconium or vanadium, preferably a titanium compound...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F110/06C08F4/649C08F4/646C08F4/02
Inventor 张天一夏先知刘月祥万真张志会段瑞林林洁马长友
Owner CHINA PETROLEUM & CHEM CORP