Carrier for olefin polymerization catalyst and application thereof, catalyst for olefin polymerization and application thereof, and olefin polymerization method

A method for preparing a spherical catalyst carrier, comprising:

• (1) subjecting a component A to a first contact and then applying a shear force on a resulting mixture to obtain a first product, the component A comprising a magnesium halide of MgXY and a first alcohol of R1OH;
• (2) subjecting the first product and a component B to a second contact to obtain a second product, the component B comprising an oxirane compound of Formula II:
• (3) subjecting the second product and a component C to a third contact to obtain a third product, the component C comprising a halogenated alcohol of R4OH and a second alcohol of R5OH;
• and
• (4) spray drying the third product,
• wherein,
• R1 is a C1-10 alkyl;
• R2 and R3 are, each independently, selected from the group consisting of H, C1-10 alkyl groups, and C1-10 alkyl groups substituted by 1 to 10 halogen atoms;
• R4 is selected from the group consisting of C1-10 alkyl groups substituted by at least one halogen atom and C6-20 aryl groups substituted by at least one halogen atom;
• R5 is a C1-5 alkyl;
• X is selected from the group consisting of fluorine, chlorine, bromine, and iodine;
• and Y is selected from the group consisting of fluorine, chlorine, bromine, iodine, C1-6 alkyl, C1-6 alkoxy, C6-14 aryl, and C6-14 aryloxy;
• and the component A, the component B and the component C used are such that the resulting spherical catalyst carrier comprises a magnesium-containing compound having a structure represented by Formula I:
• wherein, m is 0.1 to 1.9, n is 0.1 to 1.9, and m+n=2;
• 0<q<0.2;
• 0<a<0.1;
• and
• wherein, in step (3), an amount of the halogenated alcohol used is from 0.05 to 6.5 mol, and an amount of the second alcohol used is from 5 to 100 mol, relative to 1 mole of the magnesium halide used.