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Preparation method for propylene polymer and propylene polymer prepared by using same

A technology for polymerizing propylene polymers and olefins, which is applied in the direction of coating, etc., can solve the problems of low melt strength, inability to be used as coating materials, and low melt flow rate of polypropylene compositions, and achieve high melt strength Effect

Active Publication Date: 2014-02-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polypropylene compositions prepared according to the process of this patent application have a low melt flow rate and low melt strength and cannot be used as coating materials

Method used

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  • Preparation method for propylene polymer and propylene polymer prepared by using same
  • Preparation method for propylene polymer and propylene polymer prepared by using same

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Experimental program
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preparation example Construction

[0014] According to one aspect of the present invention, the present invention provides a kind of preparation method of propylene polymer, this method comprises: under polymerization reaction condition, make the olefin reaction material containing propylene and olefin polymerization catalyst and the first external electron donor component Carry out the first contact reaction in the first reactor, and carry out the second contact reaction in the second reactor with the mixture obtained after the first contact reaction and the second external electron donor component, the first external electron donor group is different from the second external electron donor component, and the molar ratio of the second external electron donor component to the first external electron donor component is greater than 9.

[0015] Preferably, in order to further improve the melt strength, fluid flow rate and molecular weight distribution coefficient of the finally prepared propylene polymer, the mola...

Embodiment approach

[0018] According to the first preferred embodiment of the present invention, the first external electron donor component is dicyclopentyldimethoxysilane (DCPMS), and the second external electron donor component is tetraethoxy Silane

[0019] (TEOS) and / or cyclohexylmethyldimethoxysilane (CHMMS). In this case, the propylene polymer prepared by this method has further improved melt strength, fluid flow rate and molecular weight distribution coefficient.

[0020] According to a second preferred embodiment of the present invention, the first external electron donor component is diisopropyldimethoxysilane (DIPMS), and the second external electron donor component is tetraethoxy Silane (TEOS) and / or Diisobutyldimethoxysilane (DIBMS). In this case, the propylene polymer prepared by this method has further improved melt strength, fluid flow rate and molecular weight distribution coefficient.

[0021] According to a third preferred embodiment of the present invention, the first exter...

Embodiment 1

[0038] This example is used to illustrate the preparation method of the propylene polymer of the present invention and the propylene polymer prepared by the method.

[0039] The catalyst used in this embodiment is composed of a main catalyst (a solid active center component containing titanium) and a cocatalyst. The main catalyst is prepared according to the method of Example 1 in the patent application CN1091748A. In the main catalyst, the titanium element The content of titanium is 2.2% by weight, the content of magnesium in terms of magnesium element is 18.0% by weight, the content of di-n-butyl phthalate (DNBP) is 11.2% by weight; the cocatalyst is triethylaluminum.

[0040] The main catalyst, co-catalyst and dicyclopentyldimethoxysilane (DCPMS, industrial first-grade product) were mixed and pretreated at 10°C for 20min, and then the pretreated material and propylene were continuously added to a volume of 2L In an autoclave, and in the liquid phase bulk environment of prop...

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Abstract

The invention provides a preparation method for a propylene polymer and a propylene polymer prepared by using the same. The preparation method for the propylene polymer comprises the following steps of: under a polymerization reaction condition, undergoing a first contact reaction on a propylene-containing olefin reaction raw material, an olefin polymerization catalyst and a first external donor component in a first reactor; undergoing a second contact reaction on a mixture obtained in the first contact reaction and a second external donor component in a second reactor, wherein the first external donor component is different from the second external donor component, and the molar ratio of the second external donor component to the first external donor component is larger than 9. Due to the adoption of the method provided by the invention, a propylene polymer with a high melt flow speed, high melt strength and wide molecular weight distribution can be obtained, and the propylene polymer is suitable for serving as a coating.

Description

technical field [0001] The invention relates to a method for preparing a propylene polymer and a propylene polymer prepared by the method. Background technique [0002] Polypropylene coating materials are suitable for surface coating of plastic woven bags, paper-plastic composite, film composite, etc. The coated packaging bag produced with polypropylene coating material has the characteristics of crisp and beautiful appearance, good waterproof performance and high strength. With the development of the packaging industry, the application of coated packaging bags is becoming more and more extensive, which makes the market demand for coated polypropylene grow rapidly. [0003] Generally, polypropylene coating materials are required to have high fluidity, and the melt flow rate (MFR) value is generally required to be 20-35g / 10min, so as to ensure good processing and film-forming properties of the coating material. At the same time, polypropylene coating materials require high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/06C08F4/646C09D123/10
Inventor 于佩潜宋文波郭梅芳魏文骏张师军胡慧杰张晓萌
Owner CHINA PETROLEUM & CHEM CORP