Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of high-tacticity polypropylene

A technology of tacticity and polypropylene is applied in the field of preparation of high tacticity polypropylene to achieve the effects of improving product performance, simple and effective operation, and convenient direct switching.

Inactive Publication Date: 2016-05-11
SINOPEC YANGZI PETROCHEM +1
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of mixed cocatalysts to tune propylene polymerization properties has not been reported in the published literature

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
  • Preparation method of high-tacticity polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The reactor for preparing high isotactic polypropylene is a steel pressure-resistant reactor with a mechanical stirring device and a temperature control jacket, and the volume of the kettle is 10L. The lid of the reaction kettle is equipped with a gaseous monomer feed port and valve, a catalyst feed port, a pressure gauge and an exhaust pipeline with a pressure controller, and a discharge valve is provided at the bottom of the reactor. Before the reaction, the temperature of the kettle was raised to 100°C, and the kettle was evacuated for 2 hours through the catalyst feed port to remove moisture and air in the kettle, and then the temperature of the kettle was lowered to 20-25°C, and the stirring speed was adjusted to 250 rpm. Add hydrogen to 0.1MPa, add 1.5 kg of polymerization-grade liquid propylene through the gaseous monomer feed port of the kettle cover, and add mixed cocatalysts triethylaluminum (TEA) and trimethylaluminum (TMA) in sequence from the catalyst feed p...

Embodiment 6

[0026] In Example 6, the amount of the main catalyst is 51.0 mg, and the mixed cocatalyst triethylaluminum (TEA) and trimethylaluminum (TMA) used are in a molar ratio of 4:1 (2M n-heptane solution). Electron donor diisobutyldimethoxysilane (P-donor, 0.5M n-heptane solution) and other operating procedures and polymerization conditions are the same as in Example 1. The catalytic efficiency of the polymerization reaction was 36.5 kg polypropylene / g catalyst. The polymer reactions and test results are listed in Table 1.

Embodiment 7

[0028] In Example 7, the amount of the main catalyst is 50.1 mg, and the mixed cocatalyst triethylaluminum (TEA) and trimethylaluminum (TMA) used are in a molar ratio of 4:2 (2M n-heptane solution). Electron donor diisobutyldimethoxysilane (P-donor, 0.5M n-heptane solution) and other operating procedures and polymerization conditions are the same as in Example 1. The catalytic efficiency of the polymerization reaction was 38.8 kg polypropylene / g catalyst. The polymer reactions and test results are listed in Table 1.

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 discloses a preparation method of high-tacticity polypropylene. The method is characterized in that a monomer propylene is homopolymerized with MgCl2 / ID / TiCl4 (ID is an internal electron donor) supported catalyst as a main catalyst, mixed trialkylaluminum as a cocatalyst and R1R2Si(OCH3)2 as an external electron donor to prepare the high-tacticity polypropylene; and the mixed cocatalyst is trimethylaluminum, triethylaluminum, a triisobutyl compound, or an arbitrary mixture thereof. The spherical efficient supported Ziegler-Natta catalyst with magnesium chloride as a carrier is adopted in the invention, so the high-tacticity polypropylene polymerized through above steps are nearly spherical or regularly spherical particles with the diameter of 0.5-2mm, and the fluidity of the particles is good.

Description

technical field [0001] The invention relates to a method for preparing polypropylene with high stereoregularity. Background technique [0002] Isotactic polypropylene is a partially crystalline polymer material with high strength, stiffness, hardness and heat resistance. The crystallization behavior, mechanical properties and material structure of isotactic polypropylene are closely related to the tacticity (isotacticity). Isotactic polypropylene with high stereoregularity has excellent mechanical properties such as high rigidity, high modulus, and high impact resistance, and has a wider range of applications. Therefore, improving the isotacticity of polypropylene has important practical application value. Generally, the methods for adjusting the isotacticity of polypropylene include: improving the organic electron donor compound (internal electron donor) added in the preparation process of the main catalyst, and adding the organosilicon compound R of the external electron...

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): C08F110/06C08F4/649C08F4/646C08F4/02
Inventor 屠嵩涛李栋王兴仁柴子斌笪文忠
Owner SINOPEC YANGZI PETROCHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com