Catalyst for olefin polymerization and preparation method thereof, catalyst composition for olefin polymerization and application thereof
A technology of olefin polymerization and catalyst, which is applied in the production of bulk chemicals, etc. It can solve the problems of low fine powder content, high isotacticity of polymers, and low fine powder content, so as to reduce initial activity, not easy to attenuate activity, and fine powder The effect of content reduction
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[0098] The second aspect of the present invention provides a method for preparing the catalyst of the present invention, characterized in that the method comprises the following steps:
[0099] 1) under the protection of inert gas, metal magnesium, ethanol and 2-ethylhexanol are subjected to reflux reaction in the presence of a halogenating agent to obtain an alkoxymagnesium carrier;
[0100] 2) in the presence of an inert diluent, the alkoxymagnesium carrier, the electron donor compound and the titanium compound are subjected to a contact reaction, and washed and dried with an inert solvent to obtain a catalyst solid component;
[0101] 3) mixing the catalyst solid component and the alkane solvent, adding an organoaluminum compound to carry out the first treatment, to obtain a catalyst precursor, and then feeding the olefin for the second treatment;
[0102] 4) the product obtained in step 3) is washed with alkane and / aromatic hydrocarbon, filtered and dried to obtain a catal...
preparation example 1
[0201] After fully replacing the 16L pressure-resistant reactor with a stirrer with nitrogen, 10L of ethanol, 300mL of 2-ethylhexanol, 11.2g of iodine, 8g of magnesium chloride and 640g of magnesium powder were added to the reactor. While stirring, the temperature of the system was raised to 75° C. for reflux reaction. After the reaction for about 5 hours, the system no longer discharged hydrogen, and the reaction was stopped. Wash with 3 L of ethanol, filter and dry to obtain alkoxymagnesium carrier A1. The obtained alkoxymagnesium carrier D50=30.2 μm, SPAN value 0.81, m value 0.015.
preparation example 2
[0203] After fully replacing the 16 L pressure-resistant reactor with a stirrer with nitrogen, 10 L of ethanol, 2500 mL of 2-ethylhexanol, 5 g of iodine, 40 g of magnesium chloride and 400 g of magnesium powder were added to the reactor. While stirring, the temperature of the system was raised to 62° C. and the reaction was refluxed. After the reaction for about 8 hours, there was no more hydrogen to be discharged from the system, and the reaction was stopped. Wash with 3 L of ethanol, filter and dry to obtain alkoxymagnesium carrier A2. The obtained alkoxymagnesium carrier D50=65.9 μm, SPAN value 0.65, m value 0.19.
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