Catalyst for olefin polymerization, preparation method and applications thereof

An olefin polymerization and catalyst technology, applied in the field of olefin polymerization, can solve the problems of inability to prepare, low isotacticity of polypropylene, and poor stereo-orientation ability.

Active Publication Date: 2018-01-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN1580034A, CN1580035A, CN1580033A, CN1436766A and CN1552740A disclose the use of glycol ester compounds as electron donors for propylene polymerization Ziegler-Natta catalysts, which are characterized in that the molecular weight distribution is wider and the polymerization activity is higher. However, when containing carboxylic acid When the spherical catalyst of the electron donor in the glycol ester is used for the polymerization of propylene, the stereospecificity is poor, and the isotacticity of the obtained polypropylene is low.
[0007] Disclosed in CN1974612A is the application of a kind of phosphoric acid ester in polypropylene catalyst as internal electron donor, but the existence of a large amount of phosphoric acid esters in the catalyst will finally bring the problem of aftertreatment
The catalyst is used for the polymerization of propylene and cannot produce products with high melt flow rate and high isotacticity at the same time

Method used

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  • Catalyst for olefin polymerization, preparation method and applications thereof
  • Catalyst for olefin polymerization, preparation method and applications thereof
  • Catalyst for olefin polymerization, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0032] According to a preferred embodiment of the present invention, the heteroatom is at least one of oxygen, nitrogen and halogen atoms, more preferably a halogen atom.

[0033] Specifically, the external electron donor can be selected from, for example, cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane Dimethoxysilane, diphenyldimethoxysilane, methyl tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxy Silane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane and (1,1,1-,trifluoro-2-propyl)-methyl at least one of dimethoxysilanes.

[0034] According to a preferred embodiment of the present invention, the external electron donor is selected from at least one of diisobutyldimethoxysilane, dicyclopentyldimethoxysilane and diisopropyldimethoxysilane One, most preferably diisobutyldimethoxysilane.

[0035] The present invention is not particularly limited to...

Embodiment 1

[0067] This example is used to illustrate the catalyst for olefin polymerization provided by the present invention and its preparation method and application.

[0068] (1) Preparation of catalyst components

[0069] In a 300ml glass reaction bottle, add 90ml (820mmol) of titanium tetrachloride and cool to -20°C, add 37mmol of magnesium halide carrier (prepared according to the method disclosed in CN1330086A Example 1) in terms of magnesium element , and then the temperature was raised to 110°C, and 0.3mmol of tributyl phosphate and 7.3mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added during the heating process, at 110°C After maintaining for 30 minutes, the liquid was filtered off, washed twice with titanium tetrachloride and five times with hexane, and dried in vacuum to obtain the catalyst component Cat-1.

[0070] As measured by X-ray fluorescence spectrometry, the phosphorus content in the catalyst component Cat-1 calculated as phosphorus element is 0.011% b...

Embodiment 2

[0074] This example is used to illustrate the catalyst for olefin polymerization provided by the present invention and its preparation method and application.

[0075] Preparation of catalyst components, catalyst and implementation of propylene liquid phase bulk polymerization according to the method of Example 1, the difference is that tributyl phosphate and 2-isopropyl-2-isoamyl-1,3 - The amount of dimethoxypropane is 1 mmol and 10 mmol, respectively, to obtain the catalyst component Cat-2.

[0076] As measured by X-ray fluorescence spectrometry, the phosphorus content in the catalyst component Cat-2 calculated as phosphorus element is 0.025% by weight.

[0077] The obtained propylene homopolymer was weighed and analyzed after drying, and the results are shown in Table 1.

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Abstract

The present invention relates to the field of olefin polymerization, particularly provides a catalyst for olefin polymerization, a preparation method and applications thereof. The catalyst for olefinpolymerization contains (i) a catalyst component, (ii) at least an alkyl aluminum compound and (iii) an external electron donor, wherein the catalyst component contains the product obtained by carrying out a reaction on a magnesium source, a titanium source and an internal electron donor, the internal electron donor contains a phosphate compound and a diether compound, the phosphorus content (calculated as the phosphorus element) in the catalyst component is not more than 0.06 wt% by using the total weight of the catalyst component as the reference, and the external electron donor has a structure represented by a formula (1). According to the present invention, the catalyst does not contain phthalate compounds (plasticizers), has high hydrogen response sensitivity and high stereospecificity, and can be used in olefin polymerization so as to obtain the polymer having narrow molecular weight distribution. The formulas (1) is (R17)x(R18)ySi(OR19)z.

Description

technical field [0001] The invention relates to the field of olefin polymerization, in particular to a catalyst for olefin polymerization, a preparation method of the catalyst, and an application of the catalyst for olefin polymerization in olefin polymerization. Background technique [0002] In plastic processing, melt flow rate is an important index used to measure the fluidity of plastic melt, and it is also an important reference for selecting plastic processing materials and grades. The melt flow rate depends largely on the molecular weight of the polymer, with low molecular weight polymers having a high melt flow rate. In order to obtain an olefin polymer with a high melt flow rate, it is generally necessary to add a large amount of hydrogen during polymerization, thereby reducing the molecular weight of the polymer. However, the upper limit of the amount of hydrogen that can be added is limited by the pressure resistance of the polymerization reactor. In order to ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F110/06C08F4/649C08F4/646
Inventor 夏先知赵瑾刘月祥任春红谭扬凌永泰李威莅高富堂彭人琪张天一陈龙
Owner CHINA PETROLEUM & CHEM CORP
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