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Catalyst for olefin high-temperature polymerization and preparation and use thereof

A high-temperature polymerization and catalyst technology, which is applied to catalysts for high-temperature polymerization of olefins and the fields of their preparation and use, can solve the problems of isotacticity and molecular weight reduction of polymerization active polymers, and achieve satisfactory polymerization activity, simple synthesis method, high The effect of regularity and average molecular weight

Inactive Publication Date: 2005-06-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when the polymerization temperature of the catalysts used for propylene polymerization is higher than 80°C, the polymerization activity, as well as the isotacticity and molecular weight of the prepared polymer will be greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a 500 ml reaction flask, add 200 ml of toluene and 0.2 mol of triethylaluminum successively. The obtained solution was cooled to -78°C, and 0.1 mol of water was slowly added dropwise with sufficient stirring for 0.5 hours. After the water was added dropwise, it was naturally returned to room temperature, and the reaction was continued for 3 hours to obtain a colorless and transparent toluene solution of aluminoxane, referred to as b1, for use. Under the protection of inert gas, add octane, cocatalyst b1, external electron donor Ph 2 Si(OCH 3 ) 2 , at a constant temperature of 90 ° C, the inert gas in the reactor was replaced with propylene gas at a pressure of 0.1 MPa, stirred (500 rpm) for 0.5 hours, and then DQ catalyst was added to start the reaction, and the pressure of propylene was raised to 0.4 MPa. After 1 hour of reaction, 200 ml of acidified ethanol was injected to terminate the polymerization reaction. The product was filtered, washed, dried under vacu...

Embodiment 2

[0026] In a 500 ml reaction flask, add 200 ml of toluene and 0.2 mol of triethylaluminum successively. The obtained solution was cooled to -78°C, and 0.13 mol of water was slowly added dropwise with sufficient stirring for 0.5 hours. After the water was added dropwise, it was naturally returned to room temperature, and the reaction was continued for 3 hours to obtain a colorless and transparent toluene solution of aluminoxane, referred to as b2, for use. Under the protection of inert gas, add octane, cocatalyst b2, external electron donor Ph 2 Si(OCH 3 ) 2 , at a constant temperature of 90 ° C, the inert gas in the reactor was replaced with propylene gas at a pressure of 0.1 MPa, stirred (500 rpm) for 0.5 hours, and then DQ catalyst was added to start the reaction, and the pressure of propylene was raised to 0.4 MPa. After 1 hour of reaction, 200 ml of acidified ethanol was injected to terminate the polymerization reaction. The product was filtered, washed, dried under vac...

Embodiment 3

[0028] In a 500 ml reaction flask, add 200 ml of toluene and 0.2 mol of triethylaluminum successively. The obtained solution was cooled to -78°C, and 0.16 mol of water was slowly added dropwise with sufficient stirring for 0.5 hours. After the water was added dropwise, it was naturally returned to room temperature, and the reaction was continued for 3 hours to obtain a colorless and transparent toluene solution of aluminoxane, referred to as b3, for use. Under the protection of inert gas, add octane, cocatalyst b3, external electron donor Ph 2 Si(OCH 3 ) 2 , at a constant temperature of 90 ° C, the inert gas in the reactor was replaced with propylene gas at a pressure of 0.1 MPa, stirred (500 rpm) for 0.5 hours, and then DQ catalyst was added to start the reaction, and the pressure of propylene was raised to 0.4 MPa. After 1 hour of reaction, 200 ml of acidified ethanol was injected to terminate the polymerization reaction. The product was filtered, washed, dried under vac...

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Abstract

The present invention discloses catalyst for high temperature olefin polymerization and its preparation process and use. The catalyst includes: supported Ziegler-Natta catalyst of titanium halide compound and organic electron donor compound supported with MgCl2 alcoholate carrier; aluminoxane prepared with trialkyl aluminum and water; and one kind of organic electron donor, such as organosilicon compound R2Si(OCH3)2, where R is phenyl, isopropyl, isobutyl or cyclopentyl. The said catalyst can catalyze propylene polymerizing reaction at 50-120 deg.c in excellent catalytic activity, and the prepared polymer has isotactivity index of 85-99 %, number average molecular weight of 43000-104000 g / mol, molecular weight distribution index of 4.5-10.6.

Description

technical field [0001] The invention relates to a catalyst for high-temperature polymerization of olefins, a preparation method and application thereof. Background technique [0002] Polypropylene and copolymers of propylene and ethylene or other α-olefins are widely used synthetic polymer materials. Supported Ziegler-Natta catalyst is one of the most important industrial catalysts for the synthesis of propylene polymers. In the industrial production process, the usual polymerization temperature is 70-80°C. A higher polymerization temperature, such as higher than 80°C, is beneficial to the removal of heat and the improvement of production efficiency in the industrial production process. However, the new supercritical propylene polymerization process that has recently appeared requires polymerization at a temperature higher than 90 °C. At present, when the polymerization temperature of the catalysts used for propylene polymerization is higher than 80°C, the polymerization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/00C08F4/645C08F10/06
Inventor 王齐张振华曹昆范志强
Owner ZHEJIANG UNIV
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