A heterogeneous propylene copolymer and its continuous gas-phase fluidized bed polymerization process

A technology of propylene copolymer and comonomer, applied in the field of heterophasic propylene copolymer, can solve the problems such as insufficient material residence time, limited control range of production process, and difficulty in meeting the requirements of the rubber phase content of impact-resistant polypropylene products. , to achieve excellent impact resistance and the effect of rigidity and toughness

Active Publication Date: 2021-05-25
JIUTAI ENERGY ZHUNGEER CO LTD
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Problems solved by technology

However, for the existing domestic polymerization production equipment, due to the limitation of the design and construction scale of the gas phase reactor, when the material level of the fluidized bed reaches the maximum limit, the residence time of the material in the gas phase copolymerization stage is still not long enough, and the control range of the production process Limited, the rubber phase content of impact polypropylene products is difficult to meet the index requirements

Method used

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  • A heterogeneous propylene copolymer and its continuous gas-phase fluidized bed polymerization process
  • A heterogeneous propylene copolymer and its continuous gas-phase fluidized bed polymerization process
  • A heterogeneous propylene copolymer and its continuous gas-phase fluidized bed polymerization process

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[0059]In the titanium-containing solid catalyst component used in the examples, Ti is 2.6 wt%, Mg is 17.0 wt%, and internal electron donor dibutyl phthalate is 15.2 wt%. In the first gas-phase fluidized bed reactor, add titanium-containing solid catalyst components, triethylaluminum, external electron donor diisopropyldimethoxysilane, propylene, and optionally ethylene to carry out polymerization. Wherein, the feeding rate of titanium-containing solid catalytic component is respectively 0.66g / hr, Al / Ti (mol / mol)=168.33, Al / Si (mol / mol)=6.21; Reactor material level 90%, polymerization time 90 minutes, obtain crystalline propylene polymer;

[0060] In the second gas-phase fluidized bed reactor, in the presence of a crystalline propylene polymer, ethylene and propylene are fed for polymerization. The material level in the reactor was 45%, and the polymerization time was 50 minutes to obtain a heterophasic propylene copolymer. The specific process conditions are shown in Table 1...

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Abstract

A heterophasic propylene copolymer produced by a continuous gas phase fluidized bed polymerization process which produces a heterophasic propylene copolymer with a high ethylene or rubbery content without fouling and without loss of yield. The heterophasic propylene copolymer obtained by the method has relatively high ethylene content and rubber component content, and exhibits excellent impact resistance and a balance between rigidity and toughness.

Description

technical field [0001] The present invention relates to a method and product of gas-phase polymerization of propylene, in particular to a continuous gas-phase fluidized-bed polymerization method for preparing a heterophasic propylene copolymer and the obtained heterophasic propylene copolymer. Background technique [0002] Homopolypropylene exhibits poor impact resistance and flexibility due to high crystallinity. However, these properties can be significantly improved by blending ethylene-propylene copolymer elastomers with crystalline homopolypropylene, resulting in polyolefin blends known as "heterophasic propylene copolymers". [0003] One way of preparing such heterophasic propylene copolymers is by melt extrusion of ethylene-propylene copolymer elastomers with crystalline homopolypropylene in an extruder or kneader. A disadvantage of this method is that it is particularly difficult to mix the two components in a homogeneous manner, since the melt viscosities of the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/06C08F210/16C08F2/34C08F4/649
CPCC08F210/06C08F210/16C08F2/34C08F4/6494
Inventor 张庆海刘鑫邵永飞卢振林刘永志安宝玉王宏亮李先亮李凤
Owner JIUTAI ENERGY ZHUNGEER CO LTD
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