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High-melt-strength propylene/ethylene copolymer and preparation method thereof

A technology of ethylene copolymer and high melt strength, which is applied in the preparation of propylene/ethylene random copolymer and the field of high melt strength propylene/ethylene random copolymer, can solve the problem that supermolecules cannot be prepared and mechanical properties cannot be obtained. Properties and Processability of Propylene Polymers and Other Issues

Active Publication Date: 2012-12-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the methods described in these patents are used to produce polypropylene, when small molecules are prepared in the first stage, the external electron donor, which is highly sensitive to hydrogen modulation, will also work in the second stage, so supermacromolecules cannot be prepared in the second stage
Likewise, high melt strength propylene polymers with superior mechanical properties and processability are not available in these patents

Method used

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  • High-melt-strength propylene/ethylene copolymer and preparation method thereof
  • High-melt-strength propylene/ethylene copolymer and preparation method thereof
  • High-melt-strength propylene/ethylene copolymer and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0069] 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:

[0070] (1) Prepolymerization reaction:

[0071] 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 %.

[0072] 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 reaction, the prepolymerization 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 condi...

Embodiment 2

[0081] With embodiment 1, only the ethylene addition in the first loop reactor becomes 35000ppmV; The ethylene addition in the second loop reactor is adjusted to 30000ppmV; Simultaneously, the hydrogen amount in the second loop reactor is adjusted to 9000ppmv .

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Abstract

The invention provides a method for preparing random high-melt-strength propylene / ethylene copolymer by direct polymerization. The method includes that during different serially operated polymerization reaction steps, according to requirements of different molecular grades, the propylene / ethylene copolymers with wide molecule distribution and 'overhigh molecular weight grade' can be prepared by controlling types and proportions of electron donor components in a Ziegler-Natta catalyst system in different reaction steps. The invention further provides random high-melt-strength propylene / ethylene copolymer which has great mechanical property, optical performance, in particular high impact strength, low melting point and high melt strength. Compared with homopolymer high-melt-strength polypropylene, the copolymerized high-melt-strength polypropylene is more applicable to preparation of multiplying-power foaming products and can be utilized in post processing for molding multiplying-power foaming beads with lower energy consumption, and the foaming beads are higher in cohesive strength and better in toughness.

Description

technical field [0001] The invention relates to a method for preparing polypropylene with high melt strength, in particular to a method for preparing a propylene / ethylene random copolymer. The present invention also relates to a propylene / ethylene random copolymer having high melt strength. technical background [0002] The tailoring of the propylene polymer structure makes it widely used in injection molding, extrusion, casting, biaxial stretching and other processing fields, but ordinary polypropylene molecules limit their use in thermoforming due to their low melt strength. , foaming and blow molding applications. Therefore, the development of polypropylene with high melt strength and good ductility has always been a subject of interest. The so-called high melt strength polypropylene (HMSPP) means that the melt can withstand a higher force when it breaks under tension. In the prior art, a propylene polymer having a melt flow rate MFR of about 2 g / 10 min has a relativel...

Claims

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Application Information

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IPC IPC(8): C08F210/06C08F210/02C08F2/38C08F4/654C08F4/646C08J9/16
Inventor 宋文波张师军郭梅芳魏文骏于鲁强胡慧杰张晓萌乔金樑
Owner CHINA PETROLEUM & CHEM CORP
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