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
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[0055] In the second aspect, embodiments of the present invention provide a method for preparing an ethylene-α-olefin polymer, the method comprising:
[0056] Add polymerization solvent and α-olefin into the polymerization kettle, charge ethylene into the polymerization kettle, and add a molecular weight regulator to dissolve ethylene in the polymerization solvent to saturation;
[0057] Add the above-mentioned catalyst composition to the polymerization kettle, and polymerize ethylene and α-olefin at a preset temperature and a preset pressure to obtain a polymerization mixture;
[0058] Adding a terminator to the polymerization mixture, and sequentially washing, distilling, 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 catalyst in the catalyst composition after ...
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[0079] Example 1
[0080] This embodiment provides an ethylene-α-olefin polymer. The ethylene-α-olefin polymer is prepared by the following method: mixing ethylene and hydrogen with a molar ratio of 1:0.02 through a circulating compressor. The polymerizer with a volume of 5L was vacuum treated for 1h, and then 2000 mL of hexane and 100 mL of 1-octene were added to the polymerizer. Start the circulating compressor, and feed a mixture of ethylene and hydrogen into the polymerization vessel, so that the ethylene is dissolved in hexane to reach saturation. Then add 10mL of hexane solution containing 0.4mmol of 2,6-di-tert-butyl-p-methyloxy vanadyl chloride, 4mmol of trichlorotriethyl dialuminum, 2mmol of 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 polymerizer is controlled to 50°C, the pressure is 0.5MPa, and the polymeri...
Example Embodiment
[0081] Example 2
[0082] This embodiment provides an ethylene-α-olefin polymer. The ethylene-α-olefin polymer is prepared by the following method: mixing ethylene and hydrogen with a molar ratio of 1:0.01 through a circulating compressor. A polymerizer with a volume of 5L was vacuum treated for 1h, and then 2000 mL of hexane and 100 mL of 1-octene were added to the polymerizer. Start the circulating compressor, and feed a mixture of ethylene and hydrogen into the polymerization vessel, so that the ethylene is dissolved in hexane to reach saturation. Then add 10 mL of a hexane solution containing 0.4 mmol of 2,6-di-tert-butyl-p-methyloxy vanadyl chloride, 4 mmol of trichlorotriethyl aluminum, 1.2 mmol of 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 polymerizer is controlled to 55°C, the pressure is 0.7MPa, and the polymeriz...
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