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

1 . A spherical catalyst carrier, comprising a magnesium-containing compound having a structure represented by Formula (1):

wherein,

R 1 is a C 1-10 alkyl;

R 2 and R 3 are, each independently, selected from the group consisting of H, C 1-10 alkyl groups, and C 1-10 alkyl groups substituted by 1 to 10 halogen atoms;

R 4 is selected from the group consisting of C 1-10 alkyl groups substituted by at least one halogen atom and C 6-20 aryl groups substituted by at least one halogen atom;

R 5 is a C 1-5 alkyl;

X is selected from the group consisting of fluorine, chlorine, bromine, and iodine;

m is 0.1 to 1.9, n is 0.1 to 1.9, and m+n=2; 0<q<0.2; and

0<a<0.1.

2 . The spherical catalyst carrier according to claim 1 , wherein R 1 , R 2 , R 3 , R 4 , R 5 , or X satisfies at least one of definitions selected from the group consisting of:

R 1 is a C 1-8 alkyl;

R 2 and R 3 are, each independently, selected from the group consisting of H, C 1-5 alkyl groups, and C 1-5 alkyl groups substituted by 1 to 10 halogen atoms;

R 4 is selected from the group consisting of C 1-10 alkyl groups substituted by at least two halogen atoms and C 6-20 aryl groups substituted by at least two halogen atoms;

R 5 is a C 1-2 alkyl; and

X is chlorine or bromine.

3 . The spherical catalyst carrier according to claim 1 , having an average particle size of from 2 to 100 microns and a particle size distribution of less than 2.

4 . The spherical catalyst carrier according to claim 1 , wherein R 1 is a C 1-6 alkyl.

5 . The spherical catalyst carrier according to claim 1 , having an average particle size of from 2 to 19 microns and a particle size distribution of from 0.6 to 1.6.

6 . A catalyst comprising the spherical catalyst carrier of claim 1 .

7 . A process for olefin polymerization, comprising contacting at least one C 2 -C 10 olefin monomer and optionally a comonomer with the catalyst of claim 6 under polymerizable conditions to form an olefin polymer, and recovering the olefin polymer.

8 . 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 R 1 OH;

(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 R 4 OH and a second alcohol of R 5 OH; and

(4) spray drying the third product,

wherein,

R 1 is a C 1-10 alkyl;

R 2 and R 3 are, each independently, selected from the group consisting of H, C 1-10 alkyl groups, and C 1-10 alkyl groups substituted by 1 to 10 halogen atoms;

R 4 is selected from the group consisting of C 1-10 alkyl groups substituted by at least one halogen atom and C 6-20 aryl groups substituted by at least one halogen atom;

R 5 is a C 1-5 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, C 1-6 alkyl, C 1-6 alkoxy, C 6-14 aryl, and C 6-14 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.

9 . The method according to claim 8 , satisfying at least one of conditions selected from:

in MgXY, X is chlorine or bromine, and Y is selected from the group consisting of chlorine, bromine, C 1-5 alkyl, C 1-5 alkoxy, C 6-10 aryl, and C 6-10 aryloxy;

MgXY is at least one selected from the group consisting of magnesium chloride, magnesium bromide, phenoxymagnesium chloride, isopropoxymagnesium chloride and n-butoxymagnesium chloride;

R 1 is a C 1-8 alkyl;

R 1 OH is at least one selected from the group consisting of ethanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, n-hexanol, n-octanol, and 2-ethylhexanol;

in Formula II, R 2 and R 3 are, each independently, selected from the group consisting of H, C 1-5 alkyl, and C 1-5 alkyl substituted by 1 to 10 halogen atoms;

the oxirane compound is at least one selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, epichlorohydrin, epoxy chlorobutane, epoxy bromopropane, and epoxy bromobutane;

in_R 4 OH, R 4 is selected from the group consisting of C 1-10 alkyl groups substituted by at least two halogen atoms and C 6-20 aryl groups substituted by at least two halogen atoms;

the halogenated alcohol is at least one selected from the group consisting of 2,2,2-trichloroethanol, 2,2-dichloroethanol, 1,2-dichloroethanol, 1,3-dichloropropanol, and 1,4-dichlorobutanol;

in R 5 OH, R 5 is a C 1-2 alkyl;

relative to 1 mole of the magnesium halide used, an amount of the first alcohol used is from 6 to 22 moles, an amount of the oxirane-type compound used is from 2 to 6 moles, the amount of the halogenated alcohol used is from 1 to 5 moles, and the amount of the second alcohol compound used is from 8 to 80 moles;

in step (1), the first contact is performed under stirring at a temperature of from 80 to 120° C. for 0.5 to 5 h;

in step (1), the first contact is carried out at a temperature of from 80 to 100° C. for 0.5 to 3 h;

in step (2), the second contact is carried out at a temperature of from 50 to 120° C. for 20 to 60 min;

in step (2), the second contact is carried out a temperature of from 80 to 100° C. for 20 to 50 min;

in step (3), the third contact is carried out under stirring at a temperature of from 0 to 120° C. for 0.5 to 6 hours; and

in step (4), the spray drying is carried out at a temperature of from 60 to 200° C.

10 . The spherical catalyst carrier prepared by the method according to claim 8 .

11 . A catalyst comprising the spherical catalyst carrier of claim 10 .

12 . A process for olefin polymerization, comprising contacting at least one C 2 -C 10 olefin monomer and optionally a comonomer with the catalyst of claim 11 under polymerizable conditions to form an olefin polymer, and recovering the olefin polymer.