Polymerizing process for improving flowability of copolypropylene powder

A technology for polypropylene powder and flow properties, which is applied in the field of polymerization to improve the flow properties of copolymerized polypropylene powder, can solve the problems of large addition amount, reduced production volume, influence catalyst activity, etc. , the effect of improving the stability of the production process

Inactive Publication Date: 2002-01-09
SINOPEC YANGZI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when the domestic Himont and Hypol production processes are used to produce multi-block copolymers, a small amount of substances harmful to the activity of the polymer are often used as surface passivators in the gas phase reactor, such as low-purity nitrogen containing oxygen and other organic substances. , so that the activity of the surface of the polymer particles is deactivated, and the surface of the particles cannot generate ethylene-propylene copolymerized substance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Example 1-21 Ethylene-propylene multi-block copolymerization using ultra-fine talc powder and high-efficiency series Ti catalysts, the change of flow properties of copolymerized PP powder, see Table 1, superfine talc powder and high-efficiency series Ti catalysts are used for the polymerization reaction Add a 2L polymerization kettle, add a certain amount of propylene, after a period of polymerization reaction, adjust the pressure of the polymerization kettle to 1.5Mpa, feed a certain amount of mixed gas with a certain amount of ethylene and propylene components, and carry out copolymerization. Polymerized PP powder, the ethylene content in the product is measured by infrared to characterize the flow properties of PP powder. Use a special conical funnel to measure the time for 100ml of powder to flow freely.

[0025] Example 22-36 Ethylene-propylene multi-block copolymerization of ultrafine calcium carbonate and high-efficiency series Ti catalysts, changes in flow proper...

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PUM

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Abstract

A polymerizing process for improving the flowability of copolypropylene powder features that the Z-N type Ti-series polypropylene catalyst system is used in the multi-phase block polymerization of polypropylene, the superfine inorganic material, said catalyst system, the trialkyl aluminium (triethyl aluminium or aluminium diethylchloride) as co-catalyst, and the alkoxyl silane as electron provider are used, and the mechanical stirring is combined with ultrasonic for uniformly dispersing said inorganic material chosen from saperfine talc powder and superfine calcium carbonate.

Description

(1) Technical field [0001] The present invention relates to the improvement of the polymerization method of copolymerized polypropylene, in particular to the polymerization method for improving the flowability of the copolymerized polypropylene powder. (2) Background technology [0002] Isotactic polypropylene (IPP) has the advantages of high melting point, high rigidity, and good processability, but its high glass transition temperature (about 0°C) and low impact strength limit its application fields. In order to broaden the application of PP, it is expected to have moderate softness, high transparency and good low temperature impact resistance. This kind of PP can only be obtained by copolymerization, and random copolymerization and heterogeneous block copolymerization (commonly known as block copolymerization) of propylene and ethylene are widely used in industry to prepare random copolymerized PP and block copolymerized PP. However, no matter when Himont production proc...

Claims

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Application Information

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IPC IPC(8): C08F2/38C08F10/06
Inventor 王兴仁朱维平柏基业吴新源
Owner SINOPEC YANGZI PETROCHEM
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