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

A high melt strength, butene copolymerization technology, used in the preparation of propylene/ethylene/butene ternary random copolymers, and the field of propylene/ethylene/butene random copolymers, can solve the problem that mechanical properties and processing cannot be obtained. Performance propylene polymers, inability to prepare supermolecules, etc.

Active Publication Date: 2012-12-12
CHINA PETROLEUM & CHEM CORP +1
View PDF14 Cites 23 Cited by
  • 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 wo

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-melt-strength propylene/ethylene/butene copolymer and preparation method thereof
  • High-melt-strength propylene/ethylene/butene copolymer and preparation method thereof
  • High-melt-strength propylene/ethylene/butene copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] 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:

[0072] (1) Prepolymerization reaction:

[0073] 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 %.

[0074] The main catalyst, co-catalyst (triethylaluminum), and the first external electron donor (dicyclopentyldimethoxysilane, DCPMS) are 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 condit...

Embodiment 2

[0083] With embodiment 1, just the ethylene addition in the first loop reactor becomes 30000ppm, and the butene addition becomes 15mol%; The ethylene addition in the second loop reactor becomes 30000ppm, and the butene addition is adjusted to 15mol%. At the same time, the amount of hydrogen in the second loop reactor was adjusted to 9300 ppmv.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for adopting a direct polymerization method to prepare a high-melt-strength propylene/ethylene/butene random copolymer. The method comprises during different polymerization reaction stages of series connection operation, controlling categories and proportions of external electron donor components in a Ziegler-Natta catalyst system at different reaction stages according to the requirements of different molecular weight fractions, so that the propylene/ethylene/butene random copolymer with wide molecular weight distribution and extremely high molecular weight fractions can be prepared. The invention further correspondingly provides the propylene/ethylene/butene random copolymer with high melt strength. Compared with homopolymerized high-melt-strength polypropylene, the propylene/ethylene/butene random copolymer has good mechanical property and optical performance, extremely low melting point and extremely high melt strength and is suitable for preparing high-magnification foaming products, post processing energy consumption is low when the propylene/ethylene/butene random copolymer is applied to molding of high-magnification foaming beads, and the foaming beads are high in adhesion strength and good 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 / butene ternary random copolymer. The present invention also relates to a propylene / ethylene / butene 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 / ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08F210/06C08F210/02C08F210/08C08F2/38C08F4/654C08F4/646C08J9/16
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap