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A kind of olefin polymerization catalyst system and its application

A technology of olefin polymerization and catalyst, which is applied in the field of olefin polymerization, can solve problems such as difficulties, and achieve the effects of simple polymerization method, high polymerization activity, and improved hydrogen adjustment sensitivity

Active Publication Date: 2019-06-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But from the general situation, in the prior art, it is difficult to effectively adjust the overall performance of the catalyst through the external electron donor or the composition of the external electron donor compound, that is, to obtain a catalyst with superior polymerization activity and melt index.

Method used

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  • A kind of olefin polymerization catalyst system and its application
  • A kind of olefin polymerization catalyst system and its application
  • A kind of olefin polymerization catalyst system and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0101] According to a specific embodiment of the present invention, the specific preparation method of the magnesium halide alcoholate carrier includes: mixing anhydrous magnesium halide and lower carbon alcohol, and heating up to react to form a magnesium halide alcoholate melt, and the reaction temperature is 90-140°C, after high-shearing in the dispersion medium, put it into the cooled inert medium to form spherical magnesium halide alcoholate particles, and obtain spherical carriers after washing and drying. High shear can be obtained by conventional methods, such as high-speed stirring method (such as CN1330086), spray method (such as US6020279), and high-gravity rotating bed (such as CN1580136A) and emulsifier method (CN1463990A). The dispersant system uses hydrocarbon inert solvents, such as kerosene, white oil, silicone oil, paraffin oil, vaseline oil, etc. The cooling medium is selected from pentane, hexane, heptane, petroleum ether, raffinate and the like.

[0102] ...

preparation example

[0114]In a 300ml stirred glass reaction bottle fully replaced by high-purity nitrogen, add 100ml of titanium tetrachloride, cool to -20°C, add spherical magnesium chloride alcoholate (see Chinese patent CN1330086A for the preparation method), and slowly heat up to 110 ℃, add 2.5mol of glycol ester compound and 3.9mmol of carboxylate compound in the process of heating up, after keeping the temperature at 110℃ for 0.5h, filter off the liquid, add titanium tetrachloride to treat twice, then wash five times with hexane, The titanium-containing solid catalyst component A was obtained after vacuum drying.

Embodiment

[0116] According to the ingredients in Examples 1-15 and Comparative Examples 1-4 in Table 1, and referring to the following conditions, the polymerization of propylene was carried out.

[0117] In a 5-liter autoclave, nitrogen flow was used to purging at 70°C for 1 hour, then the polymerization vessel was replaced 3 times with gas-phase propylene, and 5ml of alkylaluminum compound (the concentration of triethylaluminum was 0.5 mmol / ml), 1ml of the hexane solution of the external electron donor (the concentration of the external electron donor is 0.1mmol / ml), 10ml of anhydrous hexane and 8-12mg of titanium-containing solid catalyst component A. Close the autoclave, introduce a certain volume of hydrogen (at 25°C, atmospheric pressure) (L) and 1.0-1.2Kg of liquid propylene; quickly raise the internal temperature to 70°C while stirring. After polymerization at 70°C for 1 hour, the stirring was stopped, unpolymerized propylene monomer was removed, the polymer was collected, and v...

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Abstract

The present invention relates to the field of olefin polymerization, and discloses a catalyst system, which comprises a titanium-containing solid catalyst component, an alkyl aluminum compound and an external electron donor compound, wherein the titanium-containing solid catalyst component comprises at least two internal electron donor compounds such as a diol ester compound and a carboxylic acid ester, and the external electron donor compound is the combination of an ether ester compound and alkyl dialkoxysilane. The present invention further provides applications of the catalyst in olefin polymerization reactions. According to the present invention, when the solid catalyst component using the diol ester compound and the carboxylic acid ester as the internal electron donors is subjected to the olefin polymerization reaction, the compounding of the ether ester compound and the alkyl dialkoxysilane is added and used as the external electron donor used in the olefin polymerization reaction, such that the catalyst can maintain the high activity, and the melt index of the obtained polymer can be improved.

Description

technical field [0001] The invention relates to the field of olefin polymerization, in particular, the invention relates to a catalyst system and its application in olefin polymerization. Background technique [0002] As we all know, 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 alkyl aluminum compounds) and (3) an external electron donor compound added during polymerization. [0003] The use of one or several external electron donor compounds to control the stereoregularity and morphology of polymers during polymerization is well known to those skilled in the art. In addition to affecting the stereoregularity of the polymer, the external electron donor often affects other aspects of the performance of the catalyst to varying degrees. Although many compounds are known to act as external electron donors, the use of different externa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F4/649C08F4/646C08F110/06
Inventor 张天一夏先知刘月祥
Owner CHINA PETROLEUM & CHEM CORP
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