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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of mixed cocatalysts to tune propylene polymerization

Method used

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  • Preparation method of high-tacticity polypropylene

Examples

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Example Embodiment

[0023] Example 1

[0024] The reactor for preparing high-tactic polypropylene is a steel pressure-resistant reaction kettle with a mechanical stirring device and a temperature-controlling jacket, and the volume of the kettle is 10L. The reactor lid is provided with a gaseous monomer feed port and valve, a catalyst feed port, a pressure gauge and an exhaust line with a pressure controller, and a discharge valve is provided at the bottom of the autoclave. 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 to 25°C, and the stirring speed was adjusted to 250 rpm. Add hydrogen to 0.1MPa, add 1.5kg of polymer-grade liquid propylene through the gaseous monomer feed port of the kettle cover, and add the mixed co-catalysts triethylaluminum (TEA) and trimethylaluminum (TMA) in sequence from the cat...

Example Embodiment

[0025] Example 2

Example Embodiment

[0026] In Example 6, the amount of the main catalyst was 51.0 mg, and the mixed cocatalysts used were triethylaluminum (TEA) and trimethylaluminum (TMA), and the molar ratio of the two was 4:1 (2M n-heptane solution). The electron donor diisobutyldimethoxysilane (P-donor, 0.5M n-heptane solution) and other operating procedures and polymerization conditions are the same as those 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.

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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

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Application Information

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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
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