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Propylene polymerization method

A technology of propylene polymerization and bulk polymerization, applied in the field of propylene polymerization, can solve the problems of difficult to maintain temperature and pressure balance, limited solubility, and difficulty in device operation, and achieve the effects of unique addition method, improved MFR, and good mechanical properties.

Inactive Publication Date: 2011-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The polymerization process involved in the present invention is a combined process of liquid-phase bulk and gas-phase fluidized bed, and the liquid-phase bulk reaction is a gas-liquid-solid three-phase contact reaction, with a high degree of correlation between temperature and pressure, and the commonly used chain transfer agent hydrogen is due to The dissolving ability of propylene monomer is very limited, too much hydrogen will make it difficult to maintain the balance of temperature and pressure in the kettle, which will bring difficulties to the operation of the device

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add isobutyltriethoxysilane to D201, add diisobutyldimethoxysilane to D202, isobutyltriethoxysilane accounts for 95% of the total mol ratio of the two, and the rest is diisobutyldimethoxysilane Silane, hydrogen was added to D201 and D202, the addition amount was 3g / h and 2g / h respectively, and kept stable and homopolymerized.

Embodiment 2

[0017] Add isobutyltriethoxysilane to D201, add diisobutyldimethoxysilane to D202, isobutyltriethoxysilane accounts for 95% of the total mol ratio of the two, and the rest is diisobutyldimethoxysilane Base silane, hydrogen was added to D201, D202, D203 and D204, and the addition amount was 5g / h and 2g / h, 3g / h and 2g / h respectively, and kept stable and homopolymerized.

Embodiment 3

[0019] Add isobutyltriethoxysilane to D201, add diisobutyldimethoxysilane to D202, isobutyltriethoxysilane accounts for 85% of the total mol ratio of the two, and the rest is diisobutyldimethoxysilane Silane, hydrogen was added to D201 and D202, 3g / h and 2g / h respectively, the addition amount remained stable and homopolymerized.

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PUM

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Abstract

The invention relates to a propylene polymerization method which uses a bulk polymerization process and adopts a polymerization process route in which Zieggler-Natta is used as a main catalyst, alkyl aluminium is used as an assistant catalyst and two liquid phase reaction kettles and two gas-phase fluidized bed reactors are provided. The propylene polymerization method provided by the invention uses triethoxyisobutylsilane and diisobutyldimethoxysilane as electron donors and respectively adds the electron donors into different liquid phase reactors to improve hydrogen response of the catalyst, broaden the distribution of molecular weight, achieve the maximum melt index (MFR) of polypropylene homopolymer of 200 g / 10 MFR, achieve the maximum MFR of impact polypropylene co-polymer of 120 g / 10 min, achieve the maximum MFR of polypropylene random copolymer of 50 g / 10 min and achieve the maximum Mw / Mn of 9, so that the polymer also has good mechanical properties.

Description

technical field [0001] The present invention relates to the production and preparation process of polypropylene material with high fluidity and broad molecular weight distribution. The specific method of the present invention is mainly to adopt a novel external electron donor to be added independently or in combination under the in-situ liquid phase stirred tank and gas phase tank connection polymerization process, and the two types of electron donors in the combination have different hydrogen modulation response characteristics , and affect the polymerization kinetics of the catalytic system. Through this combination of external electron donors, polypropylene homopolymers or copolymers with ethylene with higher fluidity can be prepared, and the products may have higher molecular weight distribution, high impact properties and good processing properties. Background technique [0002] High-flow polypropylene brings a lot of convenience to polypropylene processing and applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F2/02C08F2/01C08F4/649
Inventor 徐宏斌王兴仁笪文忠赵飞梅利李栋
Owner CHINA PETROLEUM & CHEM CORP