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Olefin polymer-containing catalyst component and catalyst used for olefin polymerization

An olefin polymer and olefin polymerization technology, which is applied in the field of polyolefin catalysts, can solve problems such as large temperature fluctuations, high fine powder content, polymer agglomeration, etc., and achieve the advantages of increasing particle strength, good hydrogen adjustment performance, and maintaining polymerization activity Effect

Inactive Publication Date: 2016-06-08
RENQIU LIHE TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a catalyst component containing olefin polymers for olefin polymerization and a catalyst containing the catalyst component, which can solve the problems of large temperature fluctuations and easy polymerization reactions in the olefin polymerization process. Hot spots lead to polymer agglomeration and high fines content in polymer powder

Method used

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  • Olefin polymer-containing catalyst component and catalyst used for olefin polymerization
  • Olefin polymer-containing catalyst component and catalyst used for olefin polymerization
  • Olefin polymer-containing catalyst component and catalyst used for olefin polymerization

Examples

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Embodiment approach

[0036] According to an exemplary embodiment of the present invention, the olefin polymerization catalyst includes at least one of a Ziegler-Natta solid catalyst, a metallocene catalyst, and a non-metallocene catalyst. Specific catalysts in the above-mentioned several types of catalysts can be adjusted, improved, evaluated and screened by common technical means known in the art, so as to select catalysts satisfying the above-mentioned conditions for use in the preparation of olefin polymerization of the present invention. In the present invention, the olefin polymer catalyst is preferably a Ziegler-Natta solid catalyst.

[0037] According to an exemplary embodiment of the present invention, the activator is an alkylaluminum compound or an oxygen-containing organoaluminum compound, such as a trialkylaluminum compound and / or methylaluminoxane, modified methylaluminoxane, and the like. Specifically, the activator includes, but is not limited to: triethylaluminum, triisobutylalumin...

Embodiment 1

[0062] 1. Preparation of catalyst components

[0063] In a 500ml 5-necked flask with stirring fully replaced by nitrogen, add 300mL of normal hexane, 20ml of 0.5mol / L triisobutylaluminum hexane solution, 10g of the catalyst prepared in Comparative Example 1, and control the temperature at 5 ℃, constant temperature for 5 minutes; feed propylene through a mass flow meter, control the feeding rate of propylene to 20 g / h, and react for 60 minutes. Stop entering propylene, wash with n-hexane, filter, and vacuum-dry to obtain 27.8 g of solid, the analyzed titanium content is 0.8 (wt) %, and the polymer content is 64.0 (wt) %. The catalyst was stored in the form of dry powder at room temperature under the protection of nitrogen, and the storage time was recorded.

[0064] 2. Propylene polymerization

[0065] Catalysts were used for polymerization evaluation after storage at room temperature for 24 hours. After the 5L stainless steel reactor was fully replaced by nitrogen, 5 mL of ...

Embodiment 2

[0069] The only difference between using the catalyst component prepared in Example 1 and the polymerization conditions in Example 1 is that the catalyst component was placed at room temperature for 12 hours. The analysis results are shown in Table 1.

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Abstract

The invention discloses an olefin polymer-containing catalyst component used for olefin polymerization. The catalyst component is obtained by pre-polymerizing an olefin polymerization catalyst, an activator and olefin, and then storing offline, wherein the conditions of storing offline are as follows: the storage period is greater than 1 minute and less than 10 years, the storage temperature is -50 DEG C to 80 DEG C, A(Time, Temp) of the catalyst component is greater than or equal to A(0-1, Temp)*50%(g polymer / g reactive metal center), and when the fluctuation range of the storage temperature is within -10 DEG C to 10 DEG C, A(Time2, Temp) is greater than or equal to A(Time1, Temp)*50%(g polymer / g reactive metal center). The invention also discloses a catalyst used for olefin polymerization, comprising the olefin polymer-containing catalyst component, an aluminium compound and optionally, an external electron donor compound. When the catalyst component and the catalyst are applied in olefin polymerization, the problems of aggregation, caking and the like caused by catalyst particle breakage and local hot points can be avoided, and the fine powder content can be reduced.

Description

technical field [0001] The invention relates to a catalyst component and a catalyst for olefin polymerization containing olefin polymers, belonging to the field of polyolefin catalysts. Background technique [0002] At present, high-activity polyolefin catalysts have been used on a large scale in the polyolefin industry. However, the disadvantage of this type of catalyst is that its initial activity is mostly relatively high, which often leads to large temperature fluctuations in the initial stage of the polymerization reaction and hot spots in the polymerization reaction. This leads to problems such as polymer agglomeration, catalyst breakage, and high fine powder content in the polymer powder. To solve this problem, it is necessary to reduce the initial activity of the catalyst and at the same time increase the strength of the catalyst particles. [0003] In view of the above problems, the currently widely used method in industry is to introduce an "on-line" prepolymeriza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F10/06C08F4/646C08F210/16C08F4/645
CPCC08F10/00C08F10/06C08F210/16C08F4/6465C08F4/6457C08F4/6455
Inventor 王志武李树行代金松马庆利王敬禹李华姝张军伟
Owner RENQIU LIHE TECH LTD
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