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Preparation method and application of compounded carrier supported olefin polymerization catalyst

A compound carrier and olefin polymerization technology, which is applied in the field of supported olefin polymerization catalysts, can solve the problems of poor polymer morphology, low catalytic activity, and easy breakage, and achieve adjustable and controllable viscosity-average molecular weight of ultra-high molecular weight polyethylene. , high bulk density and moderate molecular weight distribution

Inactive Publication Date: 2015-04-29
TIANJIN XIQING DISTRICT RUNTIAN JINCHENG TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Catalysts supported on anhydrous magnesium chloride show high catalytic activity in olefin polymerization, but such catalysts are very brittle and break easily in the polymerization reactor, resulting in poor polymer morphology
Silica-supported catalysts have good fluidity and can be used in gas-phase fluidized bed polymerization, but silica-supported metallocene and non-metallocene catalysts show low catalytic activity

Method used

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  • Preparation method and application of compounded carrier supported olefin polymerization catalyst
  • Preparation method and application of compounded carrier supported olefin polymerization catalyst

Examples

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preparation example Construction

[0015] The invention relates to a preparation method of a composite carrier-supported olefin polymerization catalyst, comprising the following steps: dissolving a magnesium compound in a solvent in the presence of alcohol to obtain a magnesium compound solution, adding a porous carrier and mixing the magnesium compound solution, Obtain a mixed slurry, and then add a precipitant or dry the mixed slurry to obtain a composite carrier, and pass the composite carrier through a silicon-containing compound such as a siloxane compound, a halosiloxane compound or a silicon halide and a compound selected from IVB The chemical treatment agents of group metal halides are sequentially treated to obtain a compound carrier-supported olefin polymerization catalyst.

[0016] According to the present invention, examples of the magnesium compound include magnesium halide, alkoxymagnesium halide, alkoxymagnesium and alkylmagnesium halide.

[0017] Specifically, the magnesium halide is selected fr...

Embodiment 1

[0095] Anhydrous magnesium chloride is used as the magnesium compound, tetrahydrofuran is used as the solvent, ethanol is used as the alcohol, and silica gel is used as the porous carrier. First, the silica gel is thermally activated by continuously roasting the silica gel at 600° C. for 4 hours under a nitrogen atmosphere. The silicon-containing compound adopts tetraethoxy silicon, and the IVB group chemical treatment agent adopts titanium tetrachloride.

[0096] Weigh 5 grams of magnesium compound, add it to the solvent, then add alcohol, completely dissolve at room temperature to obtain a magnesium compound solution, then add a porous carrier, stir for 2 hours to obtain a mixed slurry, then evenly heat to 80 ° C, and directly vacuum dry , to obtain the composite carrier. Add the composite carrier to the hexane solvent, add the silicon-containing compound dropwise within 5 minutes at room temperature, and after 15 minutes of reaction, add the IVB group chemical treatment agent...

Embodiment 2

[0101] Basically the same as Example 1, but with the following changes:

[0102] The magnesium compound was changed to isobutoxymagnesium chloride, the alcohol was changed to n-butanol, the solvent was changed to toluene, the porous carrier was changed to titanium dioxide, and thermal activation was achieved by continuous calcination at 400°C for 4 hours under a nitrogen atmosphere. The silicon-containing compound was changed to tetraisobutoxy silicon, and the chemical treatment agent was changed to zirconium tetrachloride (ZrCl 4 ).

[0103] The mixed slurry was changed to adding a precipitating agent hexane to make it completely precipitated, filtered and washed three times with a precipitating agent, and then vacuum-dried at 60°C.

[0104] The ratio is as follows: the mass ratio of magnesium compound to porous carrier is 1:1; the molar ratio of magnesium to alcohol is 1:1; the ratio to solvent is 1mol:250ml; the molar ratio to chemical treatment agent is 1 : 0.30; the mol...

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Abstract

The invention relates to a preparation method and application of a compounded carrier supported olefin polymerization catalyst. The method is characterized in that a compounded carrier formed by a magnesium compound and a porous carrier is treated through a silicon-containing compound and a chemical treating agent containing group IVB (titanium, zirconium and hafnium) metal halides, and filtering, washing and drying are then carried out to obtain the compounded carrier supported olefin polymerization catalyst. The catalyst exhibits a high polymerization activity when used for olefin polymerization, and an obtained polymer achieves a high bulk density, uniform particle distribution, as well as moderate molecular weight distribution. The catalyst is particularly suitable for the manufacture of ultra-high molecular weight polyethylene.

Description

technical field [0001] The invention relates to a supported olefin polymerization catalyst. Specifically, the present invention relates to a compound carrier-supported olefin polymerization catalyst, its preparation method and its application in olefin homopolymerization / copolymerization. [0002] Background technique [0003] Supported olefin polymerization catalysts are suitable for slurry polymerization and polymerization processes. It is manifested as appropriately reducing the initial activity of the catalyst to a certain extent, prolonging the polymerization activity life of the catalyst, reducing or even avoiding the phenomenon of agglomeration or sudden aggregation during the polymerization process, improving the morphology of the polymer, and increasing the apparent density of the polymer , and then adapt to industrial scale application. Such catalysts mainly include titanium-based catalysts supported by magnesium chloride, titanium-based, chromium-based and vana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F10/02C08F4/02C08F4/646
Inventor 唐忠利李国宾郑中东姜云鹏徐爱国
Owner TIANJIN XIQING DISTRICT RUNTIAN JINCHENG TECH DEV
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