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Propylene homopolymer and preparation method thereof

A technology of homopolymer and propylene, which is applied in the field of propylene homopolymer and its preparation, can solve the problems that propylene homopolymer cannot be produced, and achieve the effect of enhancing catalytic activity and stereospecificity

Active Publication Date: 2018-06-26
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a propylene homopolymer and its preparation method, so as to solve the problem that the propylene homopolymer with wide molecular weight distribution and low xylene solubles cannot be prepared by using the existing preparation method

Method used

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  • Propylene homopolymer and preparation method thereof

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[0019] As described in the prior art, the propylene homopolymer prepared by the prior art has the defect that low xylene soluble content and broad molecular weight distribution cannot be achieved simultaneously, which makes the propylene homopolymer product poor in impact resistance. In order to solve the above problems, the present invention provides a method for preparing a propylene homopolymer, comprising the following steps: S1, after mixing a catalyst, a cocatalyst, an external electron donor, hydrogen and propylene, a first polymerization reaction is performed to obtain a first polymerization reaction. A product system, the first product system contains the first polymer; S2, the first product system, hydrogen and propylene are mixed and subjected to a second polymerization reaction to obtain a propylene homopolymer, and the propylene homopolymer contains the first polymer and the second polymer.

[0020] The gas phase polymerization process applied in the present inven...

Embodiment 1

[0035] The first polymerization reaction and the second polymerization reaction were carried out in two reactors, respectively. The CD catalyst, dicyclopentyldimethoxysilane and triisobutylaluminum, as well as hydrogen and propylene are mixed in the first reactor, and the first polymerization reaction is carried out under the conditions of a reaction temperature of 60° C. and 2.5 MPa to form The first product system. Among them, in terms of the molar ratio of Al element to Si element, the dosage ratio of the cocatalyst to the external electron donor is 15. During the first polymerization reaction in step S1, the first product system is obtained after monitoring the melt flow rate of the first polymer to make it reach 0.5 g / 10min.

[0036] Then, after the first product system, hydrogen and propylene are mixed in the second reactor, the second polymerization reaction is carried out under the conditions of a reaction temperature of 70° C. and 2.0 MPa to obtain a propylene homopo...

Embodiment 2

[0038] The first polymerization reaction and the second polymerization reaction were carried out in two reactors, respectively. The CD catalyst, tri-n-butylaluminum, dicyclopentyldimethoxysilane, and hydrogen and propylene are mixed in the first reactor, and the first polymerization reaction is carried out under the condition that the reaction temperature is 70° C. and 2.0 MPa to form The first product system. Wherein, in terms of the molar ratio of Al element to Si element, the dosage ratio of the cocatalyst to the external electron donor is 1. During the first polymerization reaction in step S1, after monitoring the melt flow rate of the first polymer to make it reach 4.0 g / 10min, the first product system is obtained.

[0039] Then, after mixing the first product system, hydrogen and propylene in the second reactor, the second polymerization reaction is carried out under the conditions of the reaction temperature of 60 ° C and 2.5 MPa, and then the propylene homogenate is o...

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Abstract

The invention provides noblen and a preparation method thereof. The preparation method comprises the following steps of (S1) mixing a catalyst, a co-catalyst, an external electron donor, hydrogen and propene and performing first polymerization reaction to obtain a first product system which comprises first polymer; and (S2) mixing the first product system, the hydrogen and the propene and performing second polymerization reaction to obtain the noblen. The noblen comprises second polymer and first polymer. The catalyst comprises at least one internal electron donor; and the co-catalyst is an organic aluminum compound. In a propene polymerization process, the external electron donor and the catalyst containing the internal electron donor are used, the catalytic activity and the stereoselectivity of the catalyst are improved, the isotacticity of the first polymer and the second polymer is improved, and the noblen of a low dimethylbenzene soluble matter can be prepared. A gas phase polymerization technology is successively used twice, so that the noblen has wide molecular weight distribution.

Description

technical field [0001] The invention relates to the field of polymer preparation, in particular to a propylene homopolymer and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the automobile industry, high-speed trains, construction industry, electronics and communication industries and the high performance of polypropylene products, the output and demand of polypropylene have increased significantly, and it has become the fastest growing demand in the past ten years. General purpose plastic. Low xylene soluble polypropylene is one of the new polypropylene products developed and high-performance products, and its price is about 10-15% higher than that of ordinary polypropylene. [0003] Low xylene soluble polypropylene has high crystallinity, crystallization speed, crystallization temperature, thermoplastic temperature, surface wear resistance and gloss, which greatly expands its application range and makes polypropy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F4/649C08F4/646C08F4/645C08F2/34
Inventor 吴国祥刘义郭晓东王勇高文刚杜善明关丰忠王鹤鸣
Owner CHNA ENERGY INVESTMENT CORP LTD
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