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Catalyst component for vinyl polymerization and preparation method and application of catalyst component

An ethylene polymerization and catalyst technology, applied in the field of polyethylene catalysts, can solve the problems of decreased catalyst activity, long synthesis process of catalyst components, low efficiency and the like

Inactive Publication Date: 2014-10-29
RENQIU LIHE TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1400979A discloses a prepolymerization catalyst used for ethylene polymerization through propylene prepolymerization, but the prepolymerization time is relatively long, the efficiency is low, and the catalyst activity has a certain degree of decline
However, this type of catalyst is pre-polymerized after obtaining the solid catalyst dry powder first, and the synthesis process of the catalyst component is relatively long; at the same time, it is difficult to control the mild reaction conditions, and the catalyst activity is excessively exerted during the pre-polymerization, resulting in the final catalyst particles. The problem of low activity

Method used

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  • Catalyst component for vinyl polymerization and preparation method and application of catalyst component
  • Catalyst component for vinyl polymerization and preparation method and application of catalyst component

Examples

Experimental program
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Effect test

Embodiment 1

[0074] 1. Preparation of catalyst components:

[0075] In a 500ml stirred 5-neck flask fully replaced by nitrogen, add 10g of diethoxymagnesium and 80mL of toluene to prepare a suspension, then maintain 0°C and add 20mL of titanium tetrachloride dropwise, and then slowly raise the temperature to 110°C The temperature was kept constant for 2 hours, and then the liquid was press-filtered to remove the liquid, and the obtained solid was washed three times with 100 mL of toluene at 90°C. Then, a mixed solution of 20 ml of titanium tetrachloride and 80 ml of toluene was added and stirred at 110° C. for 1 hour, and the liquid was filtered off. The obtained solid was washed 5 times with 100 mL of hexane at 60° C., and the liquid was filtered off. Add 300mL of n-hexane into the flask, add 4ml of 0.5mol / L triethylaluminum hexane solution, control the temperature at 5°C, and keep the temperature constant for 5 minutes; feed ethylene gas through a mass flow meter, and control the feedin...

Embodiment 2

[0084] 1. Preparation of catalyst components:

[0085] Add 4.76g of anhydrous magnesium chloride, 28.1ml of decane and 16.3g of isooctyl alcohol into a 100ml three-necked flask with stirring fully replaced by nitrogen, heat to 130°C, and react for 3 hours to form a uniform solution. The above solution was cooled to 50°C, 3.1 g of tetraethoxy silicon was added, and stirred for 2 hours. The above solution was cooled to room temperature, and then added dropwise to a 1 L three-necked flask with 200 mL of titanium tetrachloride kept at 0° C. within 1 hour. After the dropwise addition, the temperature was slowly raised to 110° C. and kept at a constant temperature for 2 hours. Then the liquid is press-filtered clean, the liquid is filtered off, and the obtained solid is washed twice at 110° C. with a decane solution of titanium tetrachloride with a volume fraction of 40%. °C wash twice. The obtained solid was washed twice with 150 mL of hexane at 60°C and twice at room temperatur...

Embodiment 3

[0094] 1. Preparation of catalyst components:

[0095] In a 500ml stirred 5-neck flask fully replaced by nitrogen, add 4.0g of anhydrous magnesium chloride, 50mL of toluene, 4.0ml of epichlorohydrin, 4.0ml of tributyl phosphate, and 6.4ml of ethanol in sequence, and heat up to 70 ℃, when the solid is completely dissolved to form a homogeneous solution, react for another 1 hour. The solution was cooled to -5°C, 40 mL of titanium tetrachloride was slowly added dropwise, and then 3 g of tetraethoxy silicon was added. Slowly raise the temperature to 80°C and keep the temperature for 2 hours, then press filter the liquid and remove the liquid. Then, a mixed solution of 20 ml of titanium tetrachloride and 80 ml of toluene was added and stirred at 110° C. for 1 hour, and the liquid was filtered off. The obtained solid was washed 5 times with 100 mL of hexane at 60° C., and the liquid was filtered off. Add 300mL of n-hexane into the flask, add 2ml of 0.5mol / L tri-n-hexylaluminum he...

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Abstract

The invention provides a catalyst component for vinyl polymerization. The catalyst component comprises Ti, Mg, halogens and 1-99% of olefin polymers. The catalyst component for vinyl polymerization not only has the characteristics of high activity, high bulk density, low breaking rate of polymeric particles and low fine powder content, but also has good hydrogen regulating performance.

Description

technical field [0001] The present invention relates to a catalyst component for polyolefin, in particular to a catalyst component for ethylene polymerization, its preparation method and its application in catalyzing ethylene (co)polymerization. The invention belongs to the field of polyethylene catalysts. Background technique [0002] High-performance catalysts for olefin polymerization in industrial applications are generally obtained by loading titanium compounds on active magnesium halides, and then using the solid catalyst, alkylaluminum and / or electron donors together for olefin polymerization. Patents such as USP4,298,718 first disclosed the application of such compounds in polyolefin catalysts. [0003] The control of polymer fine powder content has always been one of the key control indicators for olefin polymerization catalysts. The reason is that: too high fine powder content is one of the main reasons for the local overheating of the reactor and the fouling of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/645C08F4/646
Inventor 王志武李树行代金松马庆利张军伟李华姝王敬禹
Owner RENQIU LIHE TECH LTD
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