Catalyst composition, and ethylene-alpha-olefin polymer and preparation method thereof

A catalyst and composition technology, applied in the field of polyolefin elastomers, can solve problems such as low efficiency of ethylene-α-olefin polymers, and achieve the effects of improving catalytic effect, reducing cost and high efficiency

Active Publication Date: 2019-06-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a catalyst composition, ethylene-α-olefin polymer and its preparation method, which can solve the problem of low efficiency of polymerization to obtain ethylene-α-olefin polymer

Method used

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  • Catalyst composition, and ethylene-alpha-olefin polymer and preparation method thereof
  • Catalyst composition, and ethylene-alpha-olefin polymer and preparation method thereof

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preparation example Construction

[0055] In a second aspect, an embodiment of the present invention provides a method for preparing an ethylene-α-olefin polymer, the method comprising:

[0056] Adding polymerization solvent and α-olefin to the polymerization kettle, filling ethylene into the polymerization kettle, and adding a molecular weight regulator, so that ethylene is dissolved in the polymerization solvent to saturation;

[0057] Adding the above-mentioned catalyst composition into the polymerization kettle, and at a preset temperature and a preset pressure, ethylene and α-olefin are polymerized to obtain a polymerization mixture;

[0058] adding a terminator to the polymerization mixture, followed by washing, distillation, and drying to obtain an ethylene-α-olefin polymer;

[0059] Wherein, the volume ratio of polymerization solvent to α-olefin is 12.5-50:1;

[0060] The molar ratio of ethylene to molecular weight regulator is 1:0.01~0.03;

[0061] The molar concentration of the vanadium-based cataly...

Embodiment 1

[0080]This embodiment provides an ethylene-α-olefin polymer, which is prepared by the following method: mixing ethylene and hydrogen at a molar ratio of 1:0.02 uniformly through a circulating compressor. The polymerization kettle with a volume of 5 L was vacuum treated for 1 hour, and then 2000 mL of hexane and 100 mL of 1-octene were added into the polymerization kettle. Start the circulation compressor, feed a mixture of ethylene and hydrogen into the polymerization kettle, and dissolve ethylene in hexane to reach saturation. Then add 10 mL of hexane solution containing 0.4 mmol 2,6-di-tert-butyl-p-methyloxyvanadyl dichloride, 4 mmol trichlorotriethyl dialuminum, 2 mmol ethyl trichloroacetate to the polymerization kettle, and make The molar ratio of Al in the alkylaluminum halide, V in the vanadium-based catalyst, and ethyl trichloroacetate is 10:1:5, the temperature of the polymerization kettle is controlled at 50°C, the pressure is 0.5MPa, and the polymerization reaction t...

Embodiment 2

[0082] This embodiment provides an ethylene-α-olefin polymer, which is prepared by the following method: mixing ethylene and hydrogen at a molar ratio of 1:0.01 by a circulating compressor to make a homogeneous mixture. The polymerization kettle with a volume of 5 L was vacuum treated for 1 hour, and then 2000 mL of hexane and 100 mL of 1-octene were added into the polymerization kettle. Start the circulation compressor, feed a mixture of ethylene and hydrogen into the polymerization kettle, and dissolve ethylene in hexane to reach saturation. Then add 10mL hexane solution containing 0.4mmol 2,6-di-tert-butyl-p-methyloxyvanadyl dichloride, 4mmol trichlorotriethyldialuminum, 1.2mmol ethyl trichloroacetate to the polymerization kettle, and The molar ratio of Al in the alkylaluminum halide, V in the vanadium-based catalyst, and ethyl trichloroacetate is 10:1:3, the temperature of the polymerization kettle is controlled at 55°C, the pressure is 0.7MPa, and the polymerization react...

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Abstract

The invention discloses a catalyst composition, and an ethylene-alpha-olefin polymer and a preparation method thereof, and belongs to the field of polyolefin elastomers. The catalyst composition comprises: a vanadium-based catalyst, alkylaluminum halide and an activator, wherein the vanadium-based catalyst has a general formula of VO(OR)nClm, V is the positive pentavalent central atom of vanadium,OR and Cl are ligands, OR is phenoxy, n is 1, 2 or 3, m is 0, 1 or 2, m+n is equal to 3, and a molar ratio of Al in the alkylaluminum halide to V in the vanadium-based catalyst to the activator is 1-100:1:1-20. According to the present invention, by adding the activator, the vanadium-based catalyst permanently maintains catalytic activity; through the synergetic effect of the vanadium-based catalyst and the alkylaluminum halide, the catalyst composition has excellent catalytic effect; with the method, the consumption of the catalyst composition is reduced, and the cost is reduced; and the efficiency of the ethylene-alpha-olefin polymer obtaining through the polymerization of the catalyst composition is high, and the obtained ethylene-alpha-olefin polymer has advantages of excellent resilience, excellent flexibility and excellent Mooney viscosity.

Description

technical field [0001] The invention relates to the field of polyolefin elastomers, in particular to a catalyst composition, an ethylene-alpha-olefin polymer and a preparation method thereof. Background technique [0002] Ethylene-α-olefin polymer is a polyolefin elastomer (Polyolefin elastomer, abbreviated as POE), which has the advantages of light weight, high transparency, low hardness, good resilience, good flexibility, and good weather resistance. It can replace EPDM (Ethylene-Propylene-Diene Monomer, abbreviated as EPDM) is used in automotive, industrial, medical, packaging and other fields. Moreover, the ethylene-α-olefin polymer has the property of easy processing and molding, and no plasticizer needs to be added during the processing and molding process. Based on the above, it is necessary to synthesize and use a large amount of ethylene-α-olefin polymers. At present, ethylene-α-olefin polymers are mainly obtained by polymerizing ethylene and α-olefins under the a...

Claims

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Application Information

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IPC IPC(8): C08F210/16C08F210/14C08F4/68
Inventor 王笑海王刚刘振国张春英杨博
Owner PETROCHINA CO LTD
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