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Polypropylene Catalyst Containing Carbonate External Electron Donor

A technology of external electron donor and internal electron donor, which is applied in the field of polypropylene catalysts and can solve problems such as uncontrollable temperature adjustment, parking, and increased heat release.

Active Publication Date: 2017-04-12
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, propylene polymerization is a violent exothermic reaction, and temperature control is very important. If the temperature is too high, it may cause sudden polymerization, blockage of the reactor, and shutdown
In the polymerization reaction, when the temperature rises, the polymerization rate will increase, and the heat release will further increase, which will often cause a runaway temperature, which will bring difficulties to the control of the reactor.
Moreover, siloxane-type external electron donors cannot control the temperature adjustment during the polymerization process. Therefore, people want to adjust the temperature during the polymerization process by adding a second type of external electron donor to control the smooth progress of the polymerization reaction.

Method used

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  • Polypropylene Catalyst Containing Carbonate External Electron Donor
  • Polypropylene Catalyst Containing Carbonate External Electron Donor
  • Polypropylene Catalyst Containing Carbonate External Electron Donor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Synthesis of di(secondary)octyl carbonate compound (the second type of external electron donor)

[0069] N 2 Under protection, add 238ml of secondary octanol and 45g of potassium carbonate in a three-necked flask with stirring and dropping funnel, heat up to liquid reflux, and slowly add 45ml of dimethyl carbonate dropwise. After the dropwise addition, the temperature was maintained at 140° C. for 5 hours. After the reaction was completed, filter through a G4 funnel, wash the filtered solid residue with 2-octanol, and collect the filtrate. The content of di(secondary) octyl carbonate in the filtrate was 60% according to GC test. Element composition: C: 71.28%; H: 11.96%; O: 16.76%.

Embodiment 2

[0071] Heat the 5L high-pressure reactor to vacuumize, remove air and water, replace with nitrogen, repeat three times, and then add MgCl 2 Loaded TiCl 4Catalyst solid component 20mg (internal electron donor is diisobutyl phthalate), the content of Ti in the solid component is 2.36wt%, the addition of triethylaluminum is Al / Ti (mol)=600, bicyclic Amyldimethoxysilane, bis (secondary) octyl carbonate, the molar ratio of the two is 10:90, the molar ratio of the two external electron donors to Ti is 20, and then 168mmol hydrogen and Ti are added. 1.2 kg of propylene. Close the reaction kettle, raise the temperature of the kettle to 70°C, and start polymerization. After 2 hours of reaction, unreacted propylene is discharged to obtain 700g of polypropylene particles, the catalytic activity is 35.0KgPP / g catalyst, and the melt index of polypropylene is 12.0gPP / 10min , The isotacticity is 99.2%.

Embodiment 3-15

[0073] The polymerization process was the same as in Example 1, only the type and ratio of the external electron donor were changed. The results are shown in Table 1.

[0074]

[0075] D1: the first type of electron donor, D2: the second type of electron donor.

[0076] D: Dicyclopentyldimethoxysilane, C: Methylcyclohexyldimethoxysilane, B: Diisobutyldimethoxysilane, P: Diisopropyldimethoxysilane, NPTMS: Normal Propyltrimethoxysilane, DPTMS: Cyclopentyltrimethoxysilane, DIP: Diperhydroisoquinolinedimethoxysilane.

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PUM

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Abstract

The invention provides a catalysis system containing a multi-element external electron donor. The catalysis system comprises a solid catalysis component (A), alkyl aluminium (B) and the multi-element external electron donor (C), wherein the component (A) is a magnesium chloride supported Ti solid component and contains a diester or diether internal electron donor; the component (B) is trialkylaluminium; the component (C) comprises a first external electron donor and a second external electron donor of which the molar ratio ranges from 1 / 99 to 99 / 1; the first external electron donor is silane at least including one C1-10 alkoxy; the second external electron donor is selected from one or more carbonic ester compounds.

Description

technical field [0001] The present invention relates to polypropylene catalysts containing carbonates as external electron donors. Specifically, the multi-component external electron donor contains carbonate compounds. Background technique [0002] Ziegler-Natta propylene polymerization catalyst compositions are well known in the art. Typically, these compositions include a procatalyst, an internal electron donor, an aluminum alkyl, and an external electron donor. [0003] Diester compounds are one of the essential components of catalyst components, and with the development of diester compounds, polyolefins, especially polypropylene catalysts, have been continuously updated. At present, a large number of electron-donating compounds have been disclosed. , such as polycarboxylic acid, monocarboxylic acid ester or polycarboxylic acid ester or polycarboxylic acid ester, acid anhydride, ketone, monoether or polyether, alcohol, amine, etc. and their derivatives, among which diba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/06C08F4/649
Inventor 李化毅周倩李倩张辽云胡友良
Owner INST OF CHEM CHINESE ACAD OF SCI