Polypropylene with high melt strength and product thereof

A high melt strength, propylene technology, used in the fields of thermoforming products, blown films and blow molded products, preparation of foamed products, and biaxially oriented films

Active Publication Date: 2011-07-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the above-mentioned method for preparing homopolypropylene with a wide molecular weight distribution through multiple reactors, the ideal state is to make the molecular weight and isotacticity of the high molecular weight fraction that determine the mechanical properties of the polymer as high as possible, especially with a certain amount Fractions with a very high molecular weight, and the lower the molecular weight of the fraction that determines the extrusion performance (processing performance) of the polymer, the better, and it must have a higher content, but because the components and characteristics of the catalyst in the above-mentioned patent are in two There is no change in the reactor, so the reaction sensitivity of the catalyst to the molecular weight modifier (hydrogen) is consistent in the two stages of polymerization, which has certain limitations on the control or adjustment of the polymer chain properties

Method used

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  • Polypropylene with high melt strength and product thereof
  • Polypropylene with high melt strength and product thereof
  • Polypropylene with high melt strength and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The polymerization reaction was carried out on a polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor. Polymerization method and steps are as follows:

[0058] (1) Prepolymerization reaction:

[0059] The main catalyst (titanium-containing solid catalyst active component) is obtained by the method described in Example 1 of Chinese Patent CN93102795, its Ti content: 2.4wt%, Mg content 18.0wt%, di-n-butyl phthalate content: 13wt %.

[0060] The main catalyst, co-catalyst (triethylaluminum), and the first external electron donor (dicyclopentyldimethoxysilane, DCPMS) were pre-contacted at 10°C for 20 minutes, and then continuously added to the pre-polymerization reactor for pre-polymerization. In the polymerization reactor, the pre-polymerization is carried out in the environment of the propylene liquid phase body, the temperature is 15°C, and the residence time is about 4 minutes. Under this conditi...

Embodiment 2

[0069] Same as Example 1, except that a small amount of hydrogen is added to the make-up propylene feed of the first loop reactor, and the hydrogen concentration detected by online chromatography is 230 ppmV. The hydrogen feed amount in the make-up propylene feed to the second loop reactor was adjusted to 8500 ppmV. By adjusting the feed amount of the external electron donor, the Al / Si-I was adjusted to 45 (weight ratio), and the Al / Si-II was adjusted to 4.2 (weight ratio). The addition amount of cocatalyst triethylaluminum is unchanged.

Embodiment 3

[0071] Same as Example 2, except that the Al / Si-I is adjusted to 85 (weight ratio) by adjusting the feed amount of the external electron donor. The addition amount of cocatalyst triethylaluminum is unchanged. .

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Abstract

The invention provides homo-polypropylene with high isotacticity and high melt strength, which is characterized in that: (1) the melt index is (190 DEG C/2.16kg)1.0-10g/min; (2) the molecular weight distribution Mw/Mn=6-20; (3) the content of molecules with the molecular weight of greater than 5 million fractions is greater than or equal to 0.8wt%; and (4) Mz+1/Mn is greater than or equal to 70. The polymer can be used for producing foamed products, hot forming products, biaxially oriented films, blown films and blow molding products.

Description

technical field [0001] The present invention relates to a propylene polymer, more particularly to a propylene homopolymer with high melt strength, especially suitable for the preparation of foamed products, thermoformed products, biaxially oriented films, blown films and blown films plastic products. technical background [0002] The tailored structure of propylene homopolymer makes it widely used in processing fields such as injection molding, extrusion, casting, and biaxial stretching. However, the ordinary polypropylene molecular chain has a linear structure, unlike amorphous polymers (such as PS), which have rubber-like elastic regions in a wide temperature range, so polypropylene cannot be processed in a wide temperature range. Thermoforming. At the same time, the softening point of polypropylene is close to the melting point. When the temperature is higher than the melting point, its melt strength and melt viscosity drop sharply, resulting in uneven wall thickness of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F4/649
Inventor 郭梅芳张师军宋文波黄红红刘涛魏文俊徐焕
Owner CHINA PETROLEUM & CHEM CORP
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