Catalyst component and catalyst for olefin polymerization, application of catalyst component and catalyst and olefin polymerization method

Abstract

The invention provides a catalyst component for olefin polymerization, a catalyst, application of the catalyst and an olefin polymerization method, and the catalyst component comprises magnesium, titanium, halogen and an internal electron donor compound, the internal electron donor compounds comprise a first internal electron donor compound as shown in a general formula (I) and a second internal electron donor compound as shown in a general formula (II); the molar ratio of the first internal electron donor compound to the second internal electron donor compound is 1: (0.01-100); when the catalyst component or the catalyst is used for olefin polymerization reaction, the catalytic activity is high, the hydrogen regulation sensitivity is good, and the obtained olefin polymer is high in melt index, wide in molecular weight distribution and high in isotactic index.

Description

Technical Field

[0001] This invention belongs to the field of olefin polymerization catalysts, and specifically relates to a catalyst component, catalyst and its application for olefin polymerization, and a method for olefin polymerization. Background Technology

[0002] Solid titanium catalysts, with magnesium, titanium, halogens, and internal electron donors as basic components, can be used to catalyze the polymerization of α-olefins, especially in the polymerization of α-olefins with three or more carbon atoms, yielding polymers with high yields and high stereoregularity. Internal electron donor compounds are an essential component of these catalysts. The research and development of internal electron donor compounds has been a hot topic in novel polypropylene catalysts. With the development of internal electron donor compounds, polypropylene catalysts are constantly being updated, and many different internal electron donor compounds have been disclosed. For example, patent document CN85100997A uses di-n-butyl phthalate or diisobutyl phthalate as internal electron donor compounds; patent document CN1453298 uses glycol ester compounds; patent document CN1313869 uses succinate compounds; and patent document EP361494 uses diether compounds as internal electron donors. In industrial production, catalysts prepared from these internal electron-donating compounds have certain shortcomings. For example, the melt index of polymers obtained using phthalate or glycol ester catalysts needs to be further improved; catalysts using diethers have the problem of narrow molecular weight distribution of polymers. These disadvantages are not conducive to polymer processing and the development of new products.

[0003] Therefore, it is of great significance to develop a novel internal electron donor compound for olefin polymerization catalysts that can overcome the above-mentioned defects of existing technologies. Summary of the Invention

[0004] To address the aforementioned technical problems in the prior art, this invention provides a catalyst component, a catalyst, its application, and a method for olefin polymerization. When the catalyst component or catalyst of this invention is used in an olefin polymerization reaction, it exhibits high activity, good hydrogen sensitivity, and produces an olefin polymer with a high melt index, a wide molecular weight distribution, and a high isotactic index.

[0005] The objective of this invention is mainly achieved through the following technical solutions.

[0006] In a first aspect, the present invention provides a catalyst component for olefin polymerization, the catalyst component comprising magnesium, titanium, halogen and an internal electron donor compound, wherein the internal electron donor compound comprises a first internal electron donor compound represented by general formula (I) and a second internal electron donor compound represented by general formula (II).

[0007] The molar ratio of the first internal electron donor compound to the second internal electron donor compound is 1:0.01-100.

[0008]

[0009] In general formula (I), R1-R4 are each independently selected from hydrogen, C1-C 12 Straight-chain alkyl, C3-C 12 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 12 alkenyl, C2-C 12 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl, C4-C 20 Heterocyclic groups, halogens, hydroxyl groups, cyano groups, C1-C 12 Alkoxy and C1-C 12 At least one of the acyl groups; for R1-R4, the C1-C 12 Straight-chain alkyl, C1-C 12 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 12 alkenyl, C2-C 12 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl, C4-C 20 Heterocyclic group, hydroxyl group, C1-C 12 Alkoxy and C1-C 12 The hydrogen atom on the acyl group may optionally be replaced by a substituent.

[0010] R5 and R6 are each independently selected from C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl and C4-C 15 At least one of the heterocyclic groups; for R5 and R6, the C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C3-C 12Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl and C4-C 15 The hydrogen atom on the heterocyclic group can be optionally substituted with a substituent.

[0011] R7 and R8 can be arbitrarily connected to form a ring.

[0012] n is an integer between 0 and 4.

[0013] In general formula (II), R7 and R8 are each independently selected from C1-C 10 Straight-chain alkyl, C3-C 15 Branched alkyl, C3-C 15 Cyclic hydrocarbon group, C6-C 20 aryl, C7-C 20 aryl hydrocarbons and C7-C 20 At least one of the aromatic groups; for R7 and R8, the C1-C 10 Straight-chain alkyl, C3-C 15 Branched alkyl, C3-C 15 Cyclic hydrocarbon group, C6-C 20 aryl, C7-C 20 aryl hydrocarbons and C7-C 20 The hydrogen atom on the aromatic group can be optionally replaced by a substituent.

[0014] In R1-R4, R5-R6, and R7-R8, each substituent is independently selected from at least one of -OH, -NH2, C1-C6 alkyl-substituted amino, -CHO, -COOH, halogen, C1-C6 alkyl, and C1-C6 alkoxy.

[0015] Preferably, R1-R4 are each independently selected from C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C5-C 10 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 18 Aryl, C7-C 18 Hydrocarbon aryl, C7-C 18 Aromatic group, C6-C 18 heteroaryl, C4-C 18 Heterocyclic groups and C1-C 10At least one of alkoxy groups; preferably, R1-R4 are each independently selected from at least one of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloheptyl, cyclooctyl, phenyl, 4-methylphenyl, 4-ethylphenyl, benzyl; more preferably, R1-R4 are each independently selected from at least one of C1-C4 straight-chain alkyl, C3-C4 branched-chain alkyl, C5-C8 cycloalkyl, C2-C5 alkenyl, C6-C9 aryl, C7-C9 alkylaryl, C7-C9 aromaticyl, C6-C9 heteroaryl, and C1-C4 alkoxy groups.

[0016] Preferably, R5 and R6 are each independently selected from C1-C8 straight-chain alkyl, C3-C8 branched alkyl, and C4-C6 branched alkyl groups. 10 Cyclic hydrocarbon group, C2-C8 alkenyl group, C2-C8 alkynyl group, C6-C 15 Aryl, C7-C 15 Hydrocarbon aryl, C7-C 15 Aromatic group, C6-C 15 heteroaryl and C4-C 12 At least one of the heterocyclic groups. Preferably, R5 and R6 are each independently selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloheptyl, cyclooctyl, phenyl, naphthyl, 4-methylphenyl, 4-ethylphenyl, 4-n-propylphenyl, 4- At least one of isopropylphenyl, 4-n-butylphenyl, 4-isobutylphenyl, 4-tert-butylphenyl, 4-methoxyphenyl, 4-ethoxyphenyl, 2-methylphenyl, 2,4,6-trimethylphenyl, benzyl, phenethyl, phenyl-n-propyl, phenyl-n-butyl, phenyl-tert-butyl, phenyl isopropyl, and phenyl-n-pentyl; more preferably, R5 and R6 are each independently selected from C1-C4 straight-chain alkyl, C3-C4 branched alkyl, C5-C8 cyclic hydrocarbon, C2-C5 alkenyl, C6-C 10 Aryl, C7-C 10 Hydrocarbon aryl, C7-C 10 Aromatic groups and C4-C 12 At least one of the heterocyclic groups.

[0017] Preferably, R7 and R8 are each independently selected from C 1- C8 straight-chain alkyl, C3-C 10 Branched alkyl, C3-C10 cycloalkyl, C6-C 15 Aryl, C7-C 15 Alkyl and C7-C 15 At least one of the aryl groups.

[0018] Preferably, the first internal electron-donating compound is selected from 1,3-dioxolane-2,2-diethanol dibenzoate, 1,3-dioxolane-2,2-diethanol dicarboxylate, 1,3-dioxolane-2,2-diethanol diacetate, 1,3-dioxolane-2,2-diethanol dipropionate, 1,3-dioxolane-2,2-diethanol dibutyrate, 1,3-dioxolane-2,2-diethanol divalerate, 1,3-dioxolane-2,2-diethanol di(p-chlorobenzoic acid), 1,3-dioxolane-2,2-diethanol di(m-chlorobenzoic acid), 1,3-dioxolane-2,2-diethanol di(p-bromobenzoic acid), 1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 1,3-Dioxolane-2,2-diethanol di(4-methylbenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-diethanol dibenzoate, 4-methyl-1,3-dioxolane-2,2-diethanol dicarboxylate, 4-methyl-1,3-dioxolane-2,2-diethanol diacetate, 4 4-Methyl-1,3-dioxolane-2,2-diethanol dipropionate, 4-methyl-1,3-dioxolane-2,2-diethanol dibutyrate, 4-methyl-1,3-dioxolane-2,2-diethanol divalerate, 4-methyl-1,3-dioxolane-2,2-diethanol di(p-chlorobenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(m-chlorobenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(p-bromobenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(4-methyl ... 2-Dimethyl di(4-ethylbenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-propylbenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-butylbenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-methoxybenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-ethoxybenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl dibenzoate, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl dicarboxylate, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl diacetate, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl diacetate, 4,5-dimethyl-1,3-Dioxolane-2,2-diethanol dipropionate, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol dibutyrate, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol divalerate, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(p-chlorobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(m-chlorobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(p-bromobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-methylbenzoic acid), 4,5-Dimethyl-1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol dibenzoate, 4-ethyl-1,3-dioxolane-2,2-diethanol dicarboxylate ... 2-Dimethyl diacetate, 4-ethyl-1,3-dioxolane-2,2-dimethyl dipropionate, 4-ethyl-1,3-dioxolane-2,2-dimethyl dibutyrate, 4-ethyl-1,3-dioxolane-2,2-dimethyl divalerate, 4-ethyl-1,3-dioxolane-2,2-dimethyl di(p-chlorobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-dimethyl di(m-chlorobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-dimethyl di(p-bromobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-dimethyl di(o-bromobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-dimethyl di(4-methylbenzoic acid), 4-ethyl 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid), 4-butyl-1,3-dioxolane-2,2-diethanol dibenzoate, 4-butyl-1,3-dioxolane-2,2-diethanol dicarboxylate, 4-butyl-1,3-dioxolane-2,2-diethanol diacetate ...3-Dioxolane-2,2-dimethylpropionate, 4-Butyl-1,3-dioxolane-2,2-dimethyldibutyrate, 4-Butyl-1,3-dioxolane-2,2-dimethyldivalerate, 4-Butyl-1,3-dioxolane-2,2-dimethyldi(p-chlorobenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(m-chlorobenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(p-bromobenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(o-bromobenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(4-methylbenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(4-methylbenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(4-methylbenzoic acid) Di(4-ethylbenzoic acid) ester, 4-butyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid) ester, 4-butyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester, 4-butyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid) ester, 4-butyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid) ester, 1,3-dioxane-2,2-diethanol dibenzoate, 1,3-dioxane-2,2-diethanol dicarboxylate, 1,3-dioxane-2,2-diethanol diacetate, 1,3-dioxane-2,2-diethanol dipropionate, 1,3-dioxane-2,2-diethanol diacetate Butyrate, 1,3-dioxane-2,2-diethanol divalerate, 1,3-dioxane-2,2-diethanol di(p-chlorobenzoic acid), 1,3-dioxane-2,2-diethanol di(m-chlorobenzoic acid), 1,3-dioxane-2,2-diethanol di(p-bromobenzoic acid), 1,3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 1,3-dioxane-2,2-diethanol di(4-methylbenzoic acid), 1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid), 1,3-dioxane-2,2-diethanol di(4-propylbenzoic acid), 1,3-dioxane-2,2-diethanol di(4-butylbenzoic acid), 1,3-dioxane 2,2-Dimethanol di(4-methoxybenzoic acid) ester, 1,3-dioxane-2,2-dimethanol di(4-ethoxybenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol dibenzoate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol dicarboxylate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol diacetate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol dipropionate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol dibutyrate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol divalerate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol divalerate, 4,4,6-trimethyl-1,3-Dioxane-2,2-diethanol di(p-chlorobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(m-chlorobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(p-bromobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-methylbenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-propylbenzoic acid), 4, 4,6-Trimethyl-1,3-dioxane-2,2-diethanol di(4-butylbenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-methoxybenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-ethoxybenzoic acid), 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol dibenzoate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol dicarboxylate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol diacetate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol dipropionate, 4, 4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol dibutyrate, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol divalerate, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(p-chlorobenzoic acid), 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(m-chlorobenzoic acid), 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(p-bromobenzoic acid), 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-methyl) 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid) ester, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-propylbenzoic acid) ester, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-butylbenzoic acid) ester, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-methoxybenzoic acid) ester, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-ethoxybenzoic acid) ester, 4,7-Dimethyl-1,3-dioxane-2,2-diethanol dibenzoate, 4,7-Dimethyl-1,3-dioxane-2,2-diethanol dibenzoate,3-Dioxane-2,2-dimethyldicarboxylate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldiacetate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldipropionate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldibutyrate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldivalerate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldi(p-chlorobenzoic acid) ester, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldi(m-chlorobenzoic acid) ester, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldi(p-bromobenzoic acid) ester, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldi(p-bromobenzoic acid) ester, 4,7-dimethyl-1, At least one of the following: 3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-methylbenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-propylbenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-butylbenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-methoxybenzoic acid), and 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-ethoxybenzoic acid).

[0019] Preferably, the second internal electron-donating compound is selected from 2,2-dimethyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-di-n-propyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-di-n-butyl-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-di-n-pentyl-1,3-dimethoxypropane, 2,2-diisopentyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-n-propyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2- n-Butyl-1,3-dimethoxypropane, 2-methyl-2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-n-pentyl-1,3-dimethoxypropane, 2-methyl-2-isopentyl-1,3-dimethoxypropane, 2-ethyl-2-n-propyl-1,3-dimethoxypropane, 2-ethyl-2-isopropyl-1,3-dimethoxypropane, 2-ethyl-2-n-butyl-1,3-dimethoxypropane, 2-ethyl-2-isobutyl-1,3-dimethoxypropane, 2-ethyl-2-n-pentyl-1,3-dimethoxypropane, 2-ethyl-2-isopentyl-1,3-dimethoxypropane, 2-n-propyl-2-isopropyl-1,3-dimethoxypropane, 2-n-propyl-2-n-butyl -1,3-Dimethoxypropane, 2-n-propyl-2-isobutyl-1,3-dimethoxypropane, 2-n-propyl-2-n-pentyl-1,3-dimethoxypropane, 2-n-propyl-2-isopentyl-1,3-dimethoxypropane, 2-isopropyl-2-isobutyl-1,3-dimethoxypropane, 2-isopropyl-2-n-pentyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, 2-n-butyl-2-isobutyl-1,3-dimethoxypropane, 2-n-butyl-2-n-pentyl-1,3-dimethoxypropane, 2-n-butyl-2-isopentyl-1,3-dimethoxypropane, 2-isobutyl-2-n-pentyl-1,3-dimethoxypropane, 2-isobutyl -2-Isopentyl-1,3-dimethoxypropane, 2-isobutyl-2-phenyl-1,3-dimethoxypropane, 2-isopentyl-2-phenyl-1,3-dimethoxypropane, 2-(2-methyl-n-butyl)-2-benzyl-1,3-dimethoxypropane, 2-(2-ethylbutyl)-2-phenyl-1,3-dimethoxypropane, 2-(2-ethylhexyl)-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-ethyl-2-phenyl-1,3-dimethoxypropane, 2-isobutyl-2-benzyl-1,3-dimethoxypropane, 2-isopentyl-2-benzyl-1,3-dimethoxypropane, 2-(2-ethylbutyl)-2-benzyl-1,3-dimethoxypropane3-Dimethoxypropane, 2-(2-ethylhexyl)-2-benzyl-1,3-dimethoxypropane, 2-n-propyl-2-benzyl-1,3-dimethoxypropane, 2-isopropyl-2-benzyl-1,3-dimethoxypropane, 2-isobutyl-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-isopentyl-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-(2-methylbutyl)-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-(2-ethylhexyl)-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-methyl-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-ethyl-2 At least one of the following: (2-ethylbutyl)-1,3-dimethoxypropane, 2-isobutyl-2-(2-methylbutyl)-1,3-dimethoxypropane, 2-isopentyl-2-(2-methylbutyl)-1,3-dimethoxypropane, 2-(2-ethylhexyl)-2-(2-methylbutyl)-1,3-dimethoxypropane, 2-isobutyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopentyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-di(2-methylbutyl)-1,3-dimethoxypropane, 2,2-di(2-ethylhexyl)-1,3-dimethoxypropane, and 9,9-di(methoxymethyl)fluorene.

[0020] Preferably, the molar ratio of the first internal electron donor compound to the second internal electron donor compound is 1:0.02-50, more preferably 1:0.05-20, and even more preferably 1:0.2-6.

[0021] Preferably, the molar ratio of the magnesium, titanium, halogen and the internal electron donor compound is 1:0.5-150:0.1-800:0.02-0.4, more preferably 1:0.5-50:1-200:0.05-0.2.

[0022] In a second aspect, the present invention provides a catalyst for olefin polymerization, the catalyst comprising the catalyst components described in the first aspect, an organoaluminum compound, and optionally an external electron donor compound.

[0023] Thirdly, the present invention provides the application of the catalyst component described in the first aspect or the catalyst described in the second aspect in olefin polymerization reactions.

[0024] Fourthly, the present invention provides a method for olefin polymerization, the method comprising: contacting an olefin with the catalyst component described in the first aspect or the catalyst described in the second aspect under olefin polymerization conditions to carry out a polymerization reaction.

[0025] Preferably, the method further includes: prepolymerizing the olefin by contacting the catalyst component or catalyst prior to the polymerization reaction.

[0026] The catalyst component, catalyst, and their application, and the method for olefin polymerization involved in this invention have the following advantages:

[0027] When the catalyst combination or catalyst of the present invention is used in olefin polymerization, it not only has high catalytic activity (reaching more than 28 kg PP / gcat) and good hydrogen regulation sensitivity, but also produces an olefin polymer with a melt index of more than 6 g / 10 min and a molecular weight distribution of more than 5.2 at 230 °C and a loading of 2.16 kg, and has a high isotactic index (reaching more than 96.8%). Detailed Implementation

[0028] The inventors of this invention have discovered through research that by using a compound of 1,3-dioxane-2,2-diethanol diester and phthalate ester compounds with specific structures as internal electron donors, a catalyst with excellent comprehensive performance can be obtained. When this catalyst is used in olefin polymerization, it exhibits high activity, good hydrogen sensitivity, and the resulting polymer has a high melt index and a wide molecular weight distribution. Moreover, the resulting polymer also has a high isotactic index.

[0029] In a first aspect, the present invention provides a catalyst component for olefin polymerization, the catalyst component comprising magnesium, titanium, halogen and an internal electron donor compound, wherein the internal electron donor compound comprises a first internal electron donor compound represented by general formula (I) and a second internal electron donor compound represented by general formula (II);

[0030] The molar ratio of the first internal electron donor compound to the second internal electron donor compound is 1:0.01-100;

[0031]

[0032] In general formula (I), R1-R4 are each independently selected from hydrogen, C1-C 12 Straight-chain alkyl, C3-C 12 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 12 alkenyl, C2-C 12 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl, C4-C 20 Heterocyclic groups, halogens, hydroxyl groups, cyano groups, C1-C 12 Alkoxy and C1-C12 At least one of the acyl groups; for R1-R4, the C1-C 12 Straight-chain alkyl, C1-C 12 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 12 alkenyl, C2-C 12 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl, C4-C 20 Heterocyclic group, hydroxyl group, C1-C 12 Alkoxy and C1-C 12 The hydrogen atom on the acyl group may optionally be replaced by a substituent;

[0033] R5 and R6 are each independently selected from C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl and C4-C 15 At least one of the heterocyclic groups; for R5 and R6, the C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl and C4-C 15 The hydrogen atom on the heterocyclic group may optionally be substituted with a substituent;

[0034] R7 and R8 can be arbitrarily connected to form a ring;

[0035] n is an integer between 0 and 4;

[0036] In general formula (II), R7 and R8 are each independently selected from C1-C 10 Straight-chain alkyl, C3-C 15 Branched alkyl, C3-C 15 Cyclic hydrocarbon group, C6-C 20 aryl, C7-C20 aryl hydrocarbons and C7-C 20 At least one of the aromatic groups; for R7 and R8, the C1-C 10 Straight-chain alkyl, C3-C 15 Branched alkyl, C3-C 15 Cyclic hydrocarbon group, C6-C 20 aryl, C7-C 20 aryl hydrocarbons and C7-C 20 The hydrogen atom on the aromatic group can be optionally substituted with a substituent;

[0037] In R1-R4, R5-R6 and R7-R8, each substituent is independently selected from at least one of -OH, -NH2, C1-C6 alkyl-substituted amino, -CHO, -COOH, halogen, C1-C6 alkyl and C1-C6 alkoxy.

[0038] In a preferred embodiment of the present invention, the amino groups substituted with C1-C6 alkyl groups include -NHCH3 and / or -N(CH3)2; and / or, the halogens include at least one of fluorine, chlorine, bromine, and iodine; and / or, the C1-C6 alkyl groups include at least one of methyl, ethyl n-propyl, and isopropyl; and / or, the C1-C6 alkoxy groups include at least one of methoxy, ethoxy, n-propoxy, and isopropoxy.

[0039] In a preferred embodiment of the present invention, R1 is selected from hydrogen, halogens, and C1-C. 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C5-C 10 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 18 Aryl, C7-C 18 Hydrocarbon aryl, C7-C 18 Aromatic group, C6-C 18 heteroaryl, C4-C 18 Heterocyclic groups and C1-C 10At least one of alkoxy groups; preferably, R1 is selected from at least one of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloheptyl, cyclooctyl, phenyl, 4-methylphenyl, 4-ethylphenyl, benzyl; more preferably, R1 is selected from at least one of hydrogen, C1-C4 straight-chain alkyl, C3-C4 branched alkyl, C5-C8 cycloalkyl, C2-C5 alkenyl, C6-C9 aryl, C7-C9 alkylaryl, C7-C9 aromaticyl, C6-C9 heteroaryl, halogen, hydroxyl, cyano, and C1-C4 alkoxy groups.

[0040] In a preferred embodiment of the present invention, R2 is selected from hydrogen, halogens, and C1-C. 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C5-C 10 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 18 Aryl, C7-C 18 Hydrocarbon aryl, C7-C 18 Aromatic group, C6-C 18 heteroaryl, C4-C 18 Heterocyclic groups and C1-C 10 At least one of alkoxy groups; preferably, R2 is selected from at least one of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloheptyl, cyclooctyl, phenyl, 4-methylphenyl, 4-ethylphenyl, benzyl; more preferably, R2 is selected from at least one of hydrogen, C1-C4 straight-chain alkyl, C3-C4 branched alkyl, C5-C8 cycloalkyl, C2-C5 alkenyl, C6-C9 aryl, C7-C9 alkylaryl, C7-C9 aromaticyl, C6-C9 heteroaryl, halogen, hydroxyl, cyano, and C1-C4 alkoxy groups.

[0041] In a preferred embodiment of the present invention, R3 is selected from hydrogen, halogens, and C1-C. 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C5-C 10 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 18 Aryl, C7-C18 Hydrocarbon aryl, C7-C 18 Aromatic group, C6-C 18 heteroaryl, C4-C 18 Heterocyclic groups and C1-C 10 At least one of alkoxy groups; preferably, R3 is selected from at least one of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloheptyl, cyclooctyl, phenyl, 4-methylphenyl, 4-ethylphenyl, benzyl; more preferably, R3 is selected from at least one of hydrogen, C1-C4 straight-chain alkyl, C3-C4 branched alkyl, C5-C8 cycloalkyl, C2-C5 alkenyl, C6-C9 aryl, C7-C9 alkylaryl, C7-C9 aromaticyl, C6-C9 heteroaryl, halogen, hydroxyl, cyano, and C1-C4 alkoxy groups.

[0042] In a preferred embodiment of the present invention, R4 is selected from hydrogen, halogens, and C1-C. 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C5-C 10 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 18 Aryl, C7-C 18 Hydrocarbon aryl, C7-C 18 Aromatic group, C6-C 18 heteroaryl, C4-C 18 Heterocyclic groups and C1-C 10 At least one of alkoxy groups; preferably, R4 is selected from at least one of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloheptyl, cyclooctyl, phenyl, 4-methylphenyl, 4-ethylphenyl, benzyl; more preferably, R4 is selected from at least one of hydrogen, C1-C4 straight-chain alkyl, C3-C4 branched alkyl, C5-C8 cycloalkyl, C2-C5 alkenyl, C6-C9 aryl, C7-C9 alkylaryl, C7-C9 aromaticyl, C6-C9 heteroaryl, halogen, hydroxyl, cyano, and C1-C4 alkoxy groups.

[0043] In a preferred embodiment of the present invention, R5 is selected from C1-C8 straight-chain alkyl, C3-C8 branched alkyl, and C4-C6 branched alkyl. 10Cyclic hydrocarbon group, C2-C8 alkenyl group, C2-C8 alkynyl group, C6-C 15 Aryl, C7-C 15 Hydrocarbon aryl, C7-C 15 Aromatic group, C6-C 15 heteroaryl and C4-C 12 At least one of the heterocyclic groups; preferably, R5 is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloheptyl, cyclooctyl, phenyl, naphthyl, 4-methylphenyl, 4-ethylphenyl, 4-n-propyl At least one of phenyl, 4-isopropylphenyl, 4-n-butylphenyl, 4-isobutylphenyl, 4-tert-butylphenyl, 4-methoxyphenyl, 4-ethoxyphenyl, 2-methylphenyl, 2,4,6-trimethylphenyl, benzyl, phenethyl, phenyl-n-propyl, phenyl-n-butyl, phenyl-tert-butyl, phenyl-isopropyl, and phenyl-n-pentyl; more preferably, R5 is selected from C1-C4 straight-chain alkyl, C3-C4 branched alkyl, C5-C8 cyclic hydrocarbon, C2-C5 alkenyl, C6-C 10 Aryl, C7-C 10 Hydrocarbon aryl, C7-C 10 Aromatic groups and C4-C 12 At least one of the heterocyclic groups.

[0044] In a preferred embodiment of the present invention, R6 is selected from C1-C8 straight-chain alkyl, C3-C8 branched alkyl, and C4-C6 branched alkyl. 10 Cyclic hydrocarbon group, C2-C8 alkenyl group, C2-C8 alkynyl group, C6-C 15 Aryl, C7-C 15 Hydrocarbon aryl, C7-C 15 Aromatic group, C6-C 15 heteroaryl and C4-C 12At least one of the heterocyclic groups; preferably, R6 is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloheptyl, cyclooctyl, phenyl, naphthyl, 4-methylphenyl, 4-ethylphenyl, 4-n-propyl At least one of phenyl, 4-isopropylphenyl, 4-n-butylphenyl, 4-isobutylphenyl, 4-tert-butylphenyl, 4-methoxyphenyl, 4-ethoxyphenyl, 2-methylphenyl, 2,4,6-trimethylphenyl, benzyl, phenethyl, phenyl-n-propyl, phenyl-n-butyl, phenyl-tert-butyl, phenyl-isopropyl, and phenyl-n-pentyl; more preferably, R6 is selected from C1-C4 straight-chain alkyl, C3-C4 branched alkyl, C5-C8 cyclic hydrocarbon, C2-C5 alkenyl, C6-C 10 Aryl, C7-C 10 Hydrocarbon aryl, C7-C 10 Aromatic groups and C4-C 12 At least one of the heterocyclic groups.

[0045] In a preferred embodiment of the present invention, R7 is selected from C1-C8 straight-chain alkyl groups and C3-C4 straight-chain alkyl groups. 10 Branched alkyl, C3-C 10 cycloalkyl, C6-C 15 Aryl, C7-C 15 Alkyl and C7-C 15 At least one of the aryl groups.

[0046] In a preferred embodiment of the present invention, R8 is selected from C1-C8 straight-chain alkyl groups and C3-C4 straight-chain alkyl groups. 10 Branched alkyl, C3-C 10 cycloalkyl, C6-C 15 Aryl, C7-C 15 Alkyl and C7-C 15 At least one of the aryl groups.

[0047] In this invention, the term "cycloalkyl" refers to cycloalkyl, cycloalkenyl, or cycloynyl, "alkylaryl" refers to alkylaryl, alkenylaryl, or ynylaryl, and "aromatic" refers to aralkyl, arkenyl, or arynyl.

[0048] In a preferred embodiment of the present invention, the first internal electron-donating compound is selected from 1,3-dioxolane-2,2-diethanol dibenzoate, 1,3-dioxolane-2,2-diethanol dicarboxylate, 1,3-dioxolane-2,2-diethanol diacetate, 1,3-dioxolane-2,2-diethanol dipropionate, 1,3-dioxolane-2,2-diethanol dibutyrate, 1,3-dioxolane-2,2-diethanol divalerate, 1,3-dioxolane-2,2-diethanol di(p-chlorobenzoic acid), 1,3-dioxolane-2,2-diethanol di(m-chlorobenzoic acid), 1,3-dioxolane-2,2-diethanol di(p-bromo ... (o-bromobenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-methylbenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid) ester, 1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-diethanol dibenzoate, 4-methyl-1,3-dioxolane-2,2-diethanol dicarboxylate, 4-methyl-1,3-dioxolane-2,2-diethanol dicarboxylate, 4-methyl-1,3-dioxolane-2,2-diethanol dicarboxylate, 4-methyl-1,3-dioxolane-2,2-diethanol dicarboxylate, Dimethyl diacetate, 4-methyl-1,3-dioxolane-2,2-dimethyl dipropionate, 4-methyl-1,3-dioxolane-2,2-dimethyl dibutyrate, 4-methyl-1,3-dioxolane-2,2-dimethyl divalerate, 4-methyl-1,3-dioxolane-2,2-dimethyl di(p-chlorobenzoic acid), 4-methyl-1,3-dioxolane-2,2-dimethyl di(m-chlorobenzoic acid), 4-methyl-1,3-dioxolane-2,2-dimethyl di(p-bromobenzoic acid), 4-methyl-1,3-dioxolane-2,2-dimethyl di(o-bromobenzoic acid), 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-methylbenzoic acid), 4-methyl-1... 3-Dioxolane-2,2-diethanol di(4-ethylbenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol dibenzoate, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol dicarboxylate, 4,5-Dimethyl-1,3-dioxolane-2,2-diethanol dipropionate, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol dibutyrate, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol divalerate, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(p-chlorobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(m-chlorobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(p-bromobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di( 4-Methylbenzoic acid ester, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid) ester, 4-ethyl-1,3-dioxolane-2,2-diethanol dibenzoate, 4-ethyl-1,3-dioxolane-2,2-diethanol dicarboxylate, 4- Ethyl-1,3-dioxolane-2,2-diethanol diacetate, 4-ethyl-1,3-dioxolane-2,2-diethanol dipropionate, 4-ethyl-1,3-dioxolane-2,2-diethanol dibutyrate, 4-ethyl-1,3-dioxolane-2,2-diethanol divalerate, 4-ethyl-1,3-dioxolane-2,2-diethanol di(p-chlorobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(m-chlorobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(p-bromobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol Di(4-methylbenzoic acid) ester, 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid) ester, 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid) ester, 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester, 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid) ester, 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid) ester, 4-butyl-1,3-dioxolane-2,2-diethanol dibenzoate, 4-butyl-1,3-dioxolane-2,2-diethanol dicarboxylate ...2-Dimethyl diacetate, 4-butyl-1,3-dioxolane-2,2-dimethyl dipropionate, 4-butyl-1,3-dioxolane-2,2-dimethyl dibutyrate, 4-butyl-1,3-dioxolane-2,2-dimethyl divalerate, 4-butyl-1,3-dioxolane-2,2-dimethyl di(p-chlorobenzoic acid), 4-butyl-1,3-dioxolane-2,2-dimethyl di(m-chlorobenzoic acid), 4-butyl-1,3-dioxolane-2,2-dimethyl di(p-bromobenzoic acid), 4-butyl-1,3-dioxolane-2,2-dimethyl di(o-bromobenzoic acid), 4-butyl-1,3-dioxolane-2,2-dimethyl di(4-methylbenzoic acid), 4- Butyl-1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid), 4-butyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid), 4-butyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid), 4-butyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid), 4-butyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid), 1,3-dioxane-2,2-diethanol dibenzoate, 1,3-dioxane-2,2-diethanol dicarboxylate, 1,3-dioxane-2,2-diethanol diacetate, 1,3-dioxane-2,2-diethanol diacetate, 1,3-dioxane-2,2-diethanol dipropionic acid Esters, 1,3-dioxane-2,2-diethanol dibutyrate, 1,3-dioxane-2,2-diethanol divalerate, 1,3-dioxane-2,2-diethanol di(p-chlorobenzoic acid), 1,3-dioxane-2,2-diethanol di(m-chlorobenzoic acid), 1,3-dioxane-2,2-diethanol di(p-bromobenzoic acid), 1,3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 1,3-dioxane-2,2-diethanol di(4-methylbenzoic acid), 1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid), 1,3-dioxane-2,2-diethanol di(4-propylbenzoic acid), 1,3-dioxane-2,2-dimethylbenzoic acid Di(4-butylbenzoic acid) ester, 1,3-dioxane-2,2-diethanol di(4-methoxybenzoic acid) ester, 1,3-dioxane-2,2-diethanol di(4-ethoxybenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol dibenzoate, 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol dicarboxylate, 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol diacetate, 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol dipropionate, 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol dibutyrate, 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol dibutyrate, 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol dibutyrate,2-Dimethanol divalerate, 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(p-chlorobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(m-chlorobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(p-bromobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-methylbenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid), 4,4,6-trimethyl-1,3-dioxane- 2,2-Dimethanol di(4-propylbenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol di(4-butylbenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol di(4-methoxybenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol di(4-ethoxybenzoic acid) ester, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-dimethanol dibenzoate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-dimethanol dicarboxylate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-dimethanol diacetate, 4,4,6,6-tetramethyl-1, 3-Dioxane-2,2-dimethylpropionate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-dimethyldibutyrate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-dimethyldivalerate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-dimethyldi(p-chlorobenzoic acid), 4,4,6,6-tetramethyl-1,3-dioxane-2,2-dimethyldi(m-chlorobenzoic acid), 4,4,6,6-tetramethyl-1,3-dioxane-2,2-dimethyldi(p-bromobenzoic acid), 4,4,6,6-tetramethyl-1,3-dioxane-2,2-dimethyldi(o-bromobenzoic acid), 4,4,6,6-tetramethyl- 1,3-Dioxane-2,2-diethanol di(4-methylbenzoic acid), 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid), 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol di(4-propylbenzoic acid), 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol di(4-butylbenzoic acid), 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol di(4-methoxybenzoic acid), 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol di(4-ethoxybenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-Dimethyl dibenzoate, 4,7-dimethyl-1,3-dioxon-2,2-dimethyl dicarboxylate, 4,7-dimethyl-1,3-dioxon-2,2-dimethyl diacetate, 4,7-dimethyl-1,3-dioxon-2,2-dimethyl dipropionate, 4,7-dimethyl-1,3-dioxon-2,2-dimethyl dibutyrate, 4,7-dimethyl-1,3-dioxon-2,2-dimethyl divalerate, 4,7-dimethyl-1,3-dioxon-2,2-dimethyl di(p-chlorobenzoic acid), 4,7-dimethyl-1,3-dioxon-2,2-dimethyl di(m ... Di(p-bromobenzoic acid) ester, 4,7-dimethyl-1,3-dioxone-2,2-diethanol di(o-bromobenzoic acid) ester, 4,7-dimethyl-1,3-dioxone-2,2-diethanol di(4-methylbenzoic acid) ester, 4,7-dimethyl-1,3-dioxone-2,2-diethanol di(4-ethylbenzoic acid) ester, 4,7-dimethyl-1,3-dioxone-2,2-diethanol di(4-propylbenzoic acid) ester, 4,7-dimethyl-1,3-dioxone-2,2-diethanol di(4-butylbenzoic acid) ester, 4,7-dimethyl-1,3-dioxone-2,2-diethanol di(4-methoxy ...methylbenzoic acid) ester, 4,7-dimethyl-1,3-dioxone-2,2-diethanol di(4-methylbenzoic acid) ester, 4,7-dimethyl-1,3-dioxone-2,2-diethanol di(4-methylbenzoic acid) ester, 4,7-dimethyl-1,3-dioxone-2,2-diethanol di(4-methylbenzoic acid) ester, 4,7-dimethyl-1,3-dioxone- At least one of dimethyl di(4-ethoxybenzoic acid) ester; preferably selected from 1,3-dioxolane-2,2-dimethyl dibenzoate, 1,3-dioxolane-2,2-dimethyl di(4-methylbenzoic acid) ester, 1,3-dioxolane-2,2-dimethyl di(4-ethylbenzoic acid) ester, 1,3-dioxolane-2,2-dimethyl di(4-propylbenzoic acid) ester, 1,3-dioxolane-2,2-dimethyl di(4-butylbenzoic acid) ester, 1,3-dioxolane-2,2-dimethyl di(4-methoxybenzoic acid) ester, 1,3-dioxolane-2,2-dimethyl di(4-ethoxybenzoic acid) ester, 1,3-dioxane-2,2-dimethyl dibenzoate ... Cyclo-2,2-dimethyldi(4-methylbenzoic acid) ester, 1,3-dioxane-2,2-dimethyldi(4-ethylbenzoic acid) ester, 1,3-dioxane-2,2-dimethyldi(4-propylbenzoic acid) ester, 1,3-dioxane-2,2-dimethyldi(4-butylbenzoic acid) ester, 1,3-dioxane-2,2-dimethyldi(4-methoxybenzoic acid) ester, 1,3-dioxane-2,2-dimethyldi(4-ethoxybenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyldibenzoate, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyldi(4-methylbenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyldi(4-methylbenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyldi(4-methylbenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyldi(4-methylbenzoic acid) ester,2-Dimethyl di(4-ethylbenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl di(4-propylbenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl di(4-butylbenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl di(4-methoxybenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl di(4-ethoxybenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-dimethyl dibenzoate, 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-ethylbenzoic acid) ester ...ethylbenzoic acid ester, 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-ethylbenzoic acid) ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic acid ester, 4-ethylbenzoic 4-methyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid), 4-n-butyl-1,3-dioxolane-2,2-diethanol dibenzoate, 4-n-butyl-1,3-dioxolane-2,2-diethanol di(4-methylbenzoic acid), 4-n-butyl-1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid), 4-n-butyl-1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid), 4-n-butyl-1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid) Cyclo-2,2-dimethyl di(4-propylbenzoic acid) ester, 4-n-butyl-1,3-dioxolane-2,2-dimethyl di(4-butylbenzoic acid) ester, 4-n-butyl-1,3-dioxolane-2,2-dimethyl di(4-methoxybenzoic acid) ester, 4-n-butyl-1,3-dioxolane-2,2-dimethyl di(4-ethoxybenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethyl dibenzoate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethyl di(4-methylbenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethyl di(4-ethyl ...oxane-2,2-dimethyl di(4-ethylbenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dioxane- Hexane-2,2-dimethyl di(4-propylbenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethyl di(4-butylbenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethyl di(4-methoxybenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethyl di(4-ethoxybenzoic acid) ester, 4,7-dimethyl-1,3-dioxane-2,2-dimethyl dibenzoate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyl di(4-methylbenzoic acid) ester, 4,7-dimethyl-1,3-dioxane-2,2-dimethyl di(4-ethylbenzoic acid) ester, 4,7-dimethyl-1,3-dioxane-2,2-dimethyl di(4-ethylbenzoic acid) ester, 4,7-dimethyl-1,At least one of the following: 3-dioxane-2,2-diethanol di(4-propylbenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-butylbenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-methoxybenzoic acid), and 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-ethoxybenzoic acid).

[0049] In a preferred embodiment of the present invention, the second internal electron-donating compound is selected from 2,2-dimethyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-di-n-propyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-di-n-butyl-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-di-n-pentyl-1,3-dimethoxypropane, 2,2-diisopentyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-n-propyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, and 2-methyl-2-isopropyl-1,3-dimethoxypropane. 2-Methyl-2-n-butyl-1,3-dimethoxypropane, 2-methyl-2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-n-pentyl-1,3-dimethoxypropane, 2-methyl-2-isopentyl-1,3-dimethoxypropane, 2-ethyl-2-n-propyl-1,3-dimethoxypropane, 2-ethyl-2-isopropyl-1,3-dimethoxypropane, 2-ethyl-2-n-butyl-1,3-dimethoxypropane, 2-ethyl-2-isobutyl-1,3-dimethoxypropane, 2-ethyl-2-n-pentyl-1,3-dimethoxypropane, 2-ethyl-2-isopentyl-1,3-dimethoxypropane, 2-n-propyl-2-isopropyl-1,3-dimethoxypropane, 2-n-propyl- 2-n-Butyl-1,3-dimethoxypropane, 2-n-propyl-2-isobutyl-1,3-dimethoxypropane, 2-n-propyl-2-n-pentyl-1,3-dimethoxypropane, 2-n-propyl-2-isopentyl-1,3-dimethoxypropane, 2-isopropyl-2-isobutyl-1,3-dimethoxypropane, 2-isopropyl-2-n-pentyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, 2-n-butyl-2-isobutyl-1,3-dimethoxypropane, 2-n-butyl-2-n-pentyl-1,3-dimethoxypropane, 2-n-butyl-2-isopentyl-1,3-dimethoxypropane, 2- Isobutyl-2-isopentyl-1,3-dimethoxypropane, 2-isobutyl-2-phenyl-1,3-dimethoxypropane, 2-isopentyl-2-phenyl-1,3-dimethoxypropane, 2-(2-methyl-n-butyl)-2-benzyl-1,3-dimethoxypropane, 2-(2-ethylbutyl)-2-phenyl-1,3-dimethoxypropane, 2-(2-ethylhexyl)-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-ethyl-2-phenyl-1,3-dimethoxypropane, 2-isobutyl-2-benzyl-1,3-dimethoxypropane, 2-isopentyl-2-benzyl-1,3-dimethoxypropane, 2-(2-ethylbutyl)-2-benzyl-1,3-dimethoxypropane,3-Dimethoxypropane, 2-(2-ethylhexyl)-2-benzyl-1,3-dimethoxypropane, 2-n-propyl-2-benzyl-1,3-dimethoxypropane, 2-isopropyl-2-benzyl-1,3-dimethoxypropane, 2-isobutyl-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-isopentyl-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-(2-methylbutyl)-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-(2-ethylhexyl)-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-methyl-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-ethyl-2-(2-ethylbutyl)-1,3-dimethoxypropane, At least one of 2-isobutyl-2-(2-methylbutyl)-1,3-dimethoxypropane, 2-isopentyl-2-(2-methylbutyl)-1,3-dimethoxypropane, 2-(2-ethylhexyl)-2-(2-methylbutyl)-1,3-dimethoxypropane, 2-isobutyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopentyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-di(2-methylbutyl)-1,3-dimethoxypropane, and 9,9-di(methoxymethyl)fluorene; preferably 2-isopropyl-2-isopentyl-1,3-dimethoxypropane and / or 9,9-di(methoxymethyl)fluorene.

[0050] In a preferred embodiment of the present invention, the molar ratio of the first internal electron donor compound to the second internal electron donor compound is 1:0.02-50, preferably 1:0.05-20, more preferably 1:0.2-6, and even more preferably 1:0.2-4;

[0051] In a preferred embodiment of the present invention, the magnesium in the catalyst component is derived from a magnesium compound; preferably, the magnesium compound includes at least one of magnesium dihalide, magnesium alkoxy, alkyl magnesium, magnesium dihalide hydrate, magnesium dihalide ethanolate, derivatives of magnesium dihalide in which the halogen atom is substituted with an alkoxy group, and derivatives of magnesium dihalide in which the halogen atom is substituted with a haloalkoxy group; preferably, the alkoxy group in the derivatives of magnesium dihalide in which the halogen atom is substituted with an alkoxy group is C1-C. 10 alkoxy groups.

[0052] In a preferred embodiment of the present invention, the magnesium compound is selected from magnesium dihalides and / or magnesium dihalides alcohols, preferably selected from at least one of magnesium dichloride, magnesium dibromide, magnesium diiodide, magnesium dichloride alcohols, magnesium dibromide alcohols, and magnesium diiodide alcohols.

[0053] In a preferred embodiment of the present invention, the titanium in the catalyst component is derived from a titanium compound; preferably, the titanium compound comprises a compound with the general formula TiX. m (OR 1 ) 4-m At least one of the compounds, the TiX m (OR 1 ) 4-m R in 1 For C1-C 20 The hydrocarbon group, where X is a halogen, 1≤m≤4; preferably, R 1 For C1-C 20 Alkyl groups, more preferably C1-C 10 The alkyl group, more preferably a C1-C6 alkyl group.

[0054] In a preferred embodiment of the present invention, the titanium compound is selected from at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tetrabutoxy, titanium tetraethoxy, titanium monochlorotriethoxy, titanium dichlorodiethoxy, and titanium trichloromonoethoxy, preferably titanium tetrachloride.

[0055] In a preferred embodiment of the present invention, the molar ratio of magnesium, titanium, halogen, and the internal electron donor compound is 1:0.5-150:0.1-800:0.02-0.4, more preferably 1:0.5-50:1-200:0.05-0.2. Using this preferred content further improves the activity and hydrogen sensitivity of the catalyst components during olefin polymerization, and further improves the melt index and molecular weight distribution width of the resulting polymer. In this invention, the halogen is sourced from titanium compounds and magnesium compounds.

[0056] In this invention, the catalyst component can be prepared using conventional methods in the art. During the preparation of the catalyst component, the magnesium compound can be dissolved in a solvent system containing an organic epoxy compound and an organophosphorus compound, or it can be dissolved in a 1,3-diol ester compound.

[0057] According to some embodiments of the present invention, the organic epoxy compound includes at least one or more of C2-C8 aliphatic olefins, C2-C8 dienes, C2-C8 haloaliphatic olefins, oxides of C2-C8 dienes, glycidyl ethers, and C2-C8 internal ethers. Specific examples include, but are not limited to, at least one or more of ethylene oxide, propylene oxide, butane oxide, butadiene oxide, butadiene dioxide, epichlorohydrin, methyl glycidyl ether, diglycidyl ether, and tetrahydrofuran.

[0058] According to some embodiments of the present invention, the organophosphorus compound is a hydrocarbon ester or halohydrocarbon ester of phosphoric acid or phosphorous acid, and the specific compound is selected from trimethyl orthophosphate, triethyl orthophosphate, tributyl orthophosphate, triphenyl orthophosphate, trimethyl orthophosphate, triethyl orthophosphate, tributyl orthophosphate, triphenyl phosphite, etc.

[0059] Specifically, the catalyst component for olefin polymerization of the present invention can be prepared by the following method.

[0060] Preparation Method 1: The catalyst component was prepared according to the method disclosed in CN1506384A. First, a magnesium compound and an organic alcohol compound were mixed with an inert solvent at a molar ratio of 2-5, and the mixture was heated to 120-150°C and reacted for 1-5 hours at a magnesium / anhydride molar ratio of 5-10 and a magnesium / silicon molar ratio of 20-50. Then, the alcohol compound cooled to room temperature was added to a titanium compound solution pre-cooled to -15 to -40°C at a titanium / magnesium molar ratio of 20-50, and the mixture was heated to 90-110°C. An internal electron donor compound was added at a magnesium / ester molar ratio of 2-10, and the mixture was reacted at 100-130°C for 1-3 hours. The solid particles were then separated by filtration. Next, the solid particles were added to the titanium compound solution at a titanium / magnesium molar ratio of 20-50, stirred, and reacted at 100-130°C for 1.5-3 hours. The solid particles were then separated by filtration. Finally, the solid particles were washed with an inert solvent at 50-80°C and dried to obtain the catalyst component.

[0061] Preparation Method 2: The catalyst component is prepared according to the method disclosed in CN1006071B. First, a magnesium compound is dissolved in a solvent system composed of an organic epoxy compound, an organophosphorus compound, and an inert diluent to form a homogeneous solution. This solution is then mixed with a titanium compound, and a solid is precipitated in the presence of a precipitation aid. The solid is then treated with the internal electron donor compound of this invention to attach it to the solid. If necessary, the solid is further treated with titanium tetrahalide and an inert diluent.

[0062] Based on one mole of magnesium halide, the organic epoxy compound is 0.2 to 10 moles, the organophosphorus compound is 0.1 to 3 moles, the precipitation aid is 0 to 1.0 moles, the titanium compound is 0.5 to 150 moles, and the internal electron donor compound is 0.02 to 0.5 moles.

[0063] The precipitation aid is selected from at least one or more of organic anhydrides, organic acids, ethers, ketones, and esters. Examples include: acetic anhydride, phthalic anhydride, succinic anhydride, maleic anhydride, pyromellitic dianhydride, acetic acid, propionic acid, butyric acid, acrylic acid, methacrylic acid, acetone, methyl ethyl ketone, benzophenone, dimethyl ether, diethyl ether, propyl ether, butyl ether, pentyl ether, succinate, malonic ester, glutaric ester, 2,4-pentanediol ester, and 3,5-heptanediol ester.

[0064] Preparation Method 3: The catalyst component is prepared according to the method disclosed in CN1091748A. The magnesium chloride ethanolate melt is dispersed in a dispersant system of white oil and silicone oil by high-speed stirring to form an emulsion. This emulsion is then discharged into a cooling liquid for rapid cooling and solidification, forming magnesium chloride ethanolate microspheres. The cooling liquid is an inert hydrocarbon solvent with a low boiling point, such as petroleum ether, pentane, hexane, or heptane. The obtained magnesium chloride ethanolate microspheres are washed and dried to form a spherical carrier. The molar ratio of alcohol to magnesium chloride in the magnesium chloride ethanolate is 2–3, preferably 2–2.5. The carrier particle size is 10–300 μm, preferably 30–150 μm.

[0065] The spherical support was treated with an excess of titanium tetrachloride at low temperature, with the temperature gradually increased. An electron donor was added during the treatment process. After treatment, the catalyst was repeatedly thawed with an inert solvent and dried to obtain a solid powdered spherical catalyst. The molar ratio of titanium tetrachloride to magnesium chloride was 20–200, preferably 30–60; the initial treatment temperature was -30–0°C, preferably -25–-20°C; and the final treatment temperature was 80–136°C, preferably 100–130°C.

[0066] The obtained spherical catalyst has the following characteristics: titanium content 1.5–3.0 wt%; ester content 6.0–20.0 wt%; chlorine content 52–60 wt%; magnesium content 10–20 wt%; inert solvent content 1–6 wt%; and a catalyst specific surface area greater than 250 m². 2 / g.

[0067] Preparation Method 4: Dialkoxymagnesium is added to an aromatic hydrocarbon compound and stirred to form a suspension. The suspension is treated with tetravalent titanium chloride at -20 to 100°C and reacted at 0 to 130°C. During this process, an electron donor is added at -20 to 130°C to carry out the reaction. The resulting solid is washed with the aromatic hydrocarbon compound. Then, at 0 to 130°C, it is treated again with tetravalent titanium chloride in an aromatic hydrocarbon solvent. Finally, it is washed with an inert solvent and dried to obtain a solid catalyst. The amount of tetravalent titanium chloride used per mole of dialkylmagnesium is 0.5 to 100 mol, and the amount of electron donor is 0.01 to 10 mol.

[0068] Preparation method 5: Halogenate dialkoxymagnesium compounds such as magnesium dialkoxy or magnesium diaryloxy with TiCl4 or its aromatic solution at 80-130°C. The treatment with TiCl4 or its aromatic solution can be repeated once or multiple times, and an internal electron donor compound is added during one or more such treatments.

[0069] Preparation Method Six: The catalyst components are prepared according to the method disclosed in US4540679A. A transition metal compound (preferably a tetravalent titanium compound) and an alkoxy magnesium compound react with an electron donor in a certain ratio in an inert solvent, wherein the molar ratio of the transition metal element to magnesium element is at least 0.5:1, and the amount of the internal electron donor compound is at most 1.0 mol / g titanium atom. The inert solvent must be easily removable and must be dehydrated, deoxygenated, and free of gases that may poison the catalyst. The reaction is carried out at -10 to 170°C for a period of several minutes to several hours.

[0070] In this invention, the preparation method of the catalyst component further includes forming an emulsion of magnesium compound, electron donor, etc. in a diluent, adding titanium compound to fix it to obtain a spherical solid, and then processing it to obtain a solid catalyst.

[0071] In any of the above preparation methods, the required internal electron donor compound can be added either in the form of a compound or in other ways, such as by obtaining it in situ using an internal electron donor compound precursor. The internal electron donor compound can also be added in any step of the above catalyst preparation method.

[0072] In a preferred embodiment of the present invention, the method for preparing the first internal electron donor compound includes: in a solvent, in the presence of an acidic catalyst, contacting a first raw material represented by general formula (III) with a second raw material represented by general formula (IV) to carry out a cyclization reaction;

[0073]

[0074] In this invention, R5 and R6 in general formula (III) are the same as R5 and R6 in general formula (I); R1-R4 in general formula (IV) are the same as R1-R4 in general formula (I).

[0075] In a preferred embodiment of the present invention, the molar ratio of the first raw material to the second raw material is 1:0.8-10, preferably 1:1.5-4, and more preferably 1:1.5-2.5.

[0076] In a preferred embodiment of the present invention, the conditions for the cyclization reaction include: a reaction temperature of 30-150°C, preferably 60-120°C, and more preferably 105-115°C.

[0077] In this invention, water is generated during the cyclization reaction, and the presence of water hinders the smooth progress of the cyclization reaction. To improve the effect of the cyclization reaction, in a preferred embodiment, the preparation method further includes continuously discharging the water generated during the cyclization reaction; preferably, the water content in the reaction system of the cyclization reaction is less than 20%.

[0078] The present invention does not particularly limit the method of continuous drainage, and can use drainage devices or methods conventionally used in the art, such as the Dean-Stark device.

[0079] In a preferred embodiment of the present invention, the solvent is selected from at least one of benzene, toluene, xylene, fluorobenzene, petroleum ether, chloroform, hexane and heptane, preferably benzene and / or toluene.

[0080] In a preferred embodiment of the present invention, the acidic catalyst is selected from at least one of sulfuric acid, hydrochloric acid, p-toluenesulfonic acid, acetic acid, trifluoromethanesulfonic acid, and trifluoroacetic acid, preferably p-toluenesulfonic acid.

[0081] In this invention, the preparation method further includes separating and purifying the obtained compound to further improve its purity. The separation and purification methods are those conventionally used in the art, including but not limited to chromatography, recrystallization, and vacuum distillation.

[0082] In this invention, the first raw material can be prepared according to the method disclosed on pages 63-64 of WO2021188417A1, specifically, 1,3-dihydroxyacetone reacts with acyl chloride in pyridine to generate a compound with the general formula (II).

[0083] In a second aspect, the present invention provides a catalyst for olefin polymerization, the catalyst comprising the catalyst components described in the first aspect, an organoaluminum compound, and optionally an external electron donor compound.

[0084] In this invention, the external electron donor compound includes an organosilicon compound, the general formula of which is R. 3 k Si(OR 4 ) 4-k , 0≤k≤3; R 3 Selected from halogens, hydrogen, C1-C 20 Alkyl, C3-C 20 Cyclic hydrocarbon group, C6-C 20 Aryl, C1-C 20 At least one of alkyl halogroups and amino groups; R 4 Selected from C1-C 20 Alkyl, C3-C 20 Cyclic hydrocarbon group, C6-C 20 Aryl, C1-C 20 At least one of halogenated alkyl and amino groups; preferably, 1 ≤ k ≤ 3. Using this preferred external electron donor compound in combination with the 1,3-dioxane-2,2-dicarboxylic acid diester compound and the second internal electron donor compound can further improve the isotactic index of the polymerized olefin and the catalytic activity of the catalyst.

[0085] In a preferred embodiment of the present invention, the organosilicon compound is selected from trimethylmethoxysilane, trimethylethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, dicyclopentyldimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, di-n-propyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, n-propyltrimethoxysilane, isopropyltrimethoxysilane, n-butyltrimethoxysilane, isobutyltrimethoxysilane, vinyltrimethoxysilane, phenyltrimethoxysilane, n-propyltriethoxysilane, isopropyl The silane is selected from at least one of the following: methyltriethoxysilane, n-butyltriethoxysilane, isobutyltriethoxysilane, phenyltriethoxysilane, cyclohexylmethyldimethoxysilane, and methyl tert-butyldimethoxysilane, preferably selected from at least one of the following: n-propyltrimethoxysilane, n-butyltrimethoxysilane, di-n-propyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, cyclohexylmethyldimethoxysilane, diphenyldimethoxysilane, and dicyclopentyldimethoxysilane; more preferably selected from at least one of the following: cyclohexylmethyldimethoxysilane, diphenyldimethoxysilane, and dicyclopentyldimethoxysilane.

[0086] In a preferred embodiment of the present invention, the organoaluminum compound is an alkylaluminum compound; preferably, the alkylaluminum compound has the general formula AlR. 2 j X 3-j The R 2 It is hydrogen or C1-C 20 The hydrocarbon group is preferably hydrogen or C1-C8 alkyl, where X is a halogen and 1≤j≤3; more preferably, the alkyl aluminum compound is selected from at least one of triethylaluminum, tripropylaluminum, tri-n-butylaluminum, triisobutylaluminum, tri-n-octylaluminum, triisooctylaluminum, diethylaluminum monohydrogen, diisobutylaluminum monohydrogen, diethylaluminum monochloro, diisobutylaluminum monochloro, sesquiethylaluminum chloride, and diethylaluminum dichloro, and is even more preferably triethylaluminum or triisobutylaluminum.

[0087] In a preferred embodiment of the present invention, the molar ratio of aluminum to titanium in the alkylaluminum compound is 5-1000:1, preferably 25-100:1; and / or, the molar ratio of silicon to titanium in the external electron donor compound is 0.1-500:1, preferably 25-100:1. Using this preferred molar ratio can further improve the isotactic index of the catalytically obtained olefin polymer.

[0088] Thirdly, the present invention provides the application of the catalyst component described in the first aspect or the catalyst described in the second aspect in olefin polymerization reactions.

[0089] In this invention, the olefin polymerization reaction includes homopolymerization or copolymerization.

[0090] Fourthly, the present invention provides a method for olefin polymerization, the method comprising: contacting an olefin with the catalyst component described in the first aspect or the catalyst described in the second aspect under olefin polymerization conditions to carry out a polymerization reaction.

[0091] In a preferred embodiment of the present invention, the olefin comprises an olefin as shown in the general formula CH2=CHR, wherein R is hydrogen, C1-C 12 Alkyl or C1-C 12 The aryl group, preferably C1-C 12 Alkyl, more preferably C1-C6 alkyl.

[0092] In a preferred embodiment of the present invention, the olefin is selected from at least one of ethylene, propylene, 1-butene, 4-methyl-1-pentene and 1-hexene, preferably ethylene and / or propylene.

[0093] In this invention, the polymerization reaction employs conventional polymerization methods, such as slurry polymerization or gas-phase fluidized bed polymerization. Specifically, the polymerization reaction is carried out under the protection of an inert gas, in a liquid monomer or an inert solvent containing the monomer, or in the gas phase, or through a combined gas-liquid phase polymerization process.

[0094] In this invention, the polymerization reaction temperature is 0–150°C, preferably 60–90°C. The polymerization reaction pressure can be atmospheric pressure or higher, preferably 0.01–10 MPa, more preferably 0.01–6 MPa, and even more preferably 0.1–4 MPa. All pressures in this invention refer to gauge pressure. During the polymerization process, hydrogen can be added to the reaction system as a polymer molecular weight regulator to adjust the polymer's molecular weight and melt index. Furthermore, in the polymerization reaction of olefins, the types and amounts of inert gases and solvents are well known to those skilled in the art and will not be described further here.

[0095] The olefin polymerization method of the present invention can be a homopolymerization of a single olefin or a copolymerization of multiple olefins.

[0096] In a preferred embodiment of the present invention, the method further includes: prepolymerizing the olefin by contacting the catalyst component or catalyst prior to the polymerization reaction. In this invention, the term "prepolymerization" refers to polymerization with a lower degree of conversion.

[0097] In a preferred embodiment of the present invention, the prepolymerization ratio is: relative to 1g of catalyst component, 0.1-1000g of olefin polymer is obtained, preferably 0.5-20g of olefin polymer is obtained.

[0098] In this invention, the olefin used for prepolymerization may be the same as or different from the olefin used for polymerization. Preferably, the olefin used for prepolymerization is selected from ethylene or propylene.

[0099] In a preferred embodiment of the present invention, ethylene or propylene is prepolymerized with an α-olefin; preferably, the amount of the α-olefin is 0.1-20 mol% of the amount of ethylene or propylene.

[0100] Preferably, the conversion degree of the catalyst component participating in the prepolymerization is 0.2-800 g polymer / gram catalyst component.

[0101] In a preferred embodiment of the present invention, the prepolymerization is carried out in the liquid phase or the gas phase.

[0102] In a preferred embodiment of the present invention, the conditions for the prepolymerization reaction include: a polymerization temperature of -40 to 80°C, preferably -20 to 50°C; and a polymerization pressure of 0.01 to 10 MPa, preferably 0.01 to 6 MPa.

[0103] In this invention, the prepolymerization can be performed online as a step in the olefin polymerization method, or it can be performed independently in a batch operation, preferably independently in a batch operation.

[0104] In a preferred embodiment of the present invention, the prepolymerization is selected by preparing a polymer of 0.5-20 g / g solid catalyst component through batch operation.

[0105] The following detailed description of preferred embodiments of the present invention illustrates the principles of the invention and is not intended to limit the scope of the invention.

[0106] Test methods

[0107] 1) Polymer isotactic index: The isotactic index is determined by heptane extraction. 2g of dried polymer sample is placed in an extractor and extracted with boiling heptane for 6 hours. The residue is dried to constant weight. The ratio of the polymer weight (g) to 2 (g) is the isotactic index.

[0108] 2) Melt index (MI) of the polymer: determined according to GB / T 3682-2000; measurement temperature 230℃, load 2.16kg pressure.

[0109] 3) Polymer molecular weight distribution (MWD, MWD = M w / M nGel permeation chromatography was used, with trichlorobenzene as solvent in a PL-GPC220 column at 150℃ (standard: polystyrene, flow rate: 1.0 mL / min, column: 3x Plgel 10um M1xED-B 300x7.5nm).

[0110] Preparation Example 1

[0111] Preparation of 1,3-dioxolane-2,2-diethanol dibenzoate (ID-1):

[0112] (1) Take 7g of 1,3-dihydroxyacetone dibenzoate, 2.7mL of ethylene glycol and 0.5g of p-toluenesulfonic acid and disperse them in 100mL of toluene to carry out the cyclization reaction. Connect the Dean-Stark apparatus to continuously discharge the generated water and heat under reflux for 24h.

[0113] (2) Cool the reaction mixture obtained from the cyclization reaction to room temperature, add 50 mL of saturated sodium carbonate solution to wash and collect the aqueous phase, repeat the washing and collection of the aqueous phase until the washed organic phase is neutral; add 20 mL of toluene to the obtained aqueous phase for extraction, and combine the extracted organic phase with the organic phase obtained from the previous washing; then add 100 mL of saturated brine to wash the organic phase, and dry the organic phase with anhydrous sodium sulfate; filter the organic phase, remove the solvent by rotary evaporation of the filtrate, and obtain a pale yellow crude product solid.

[0114] The crude product was recrystallized from ethanol, filtered, and dried to obtain colorless crystals; upon testing, 1 ¹H NMR (δ, ppm, CDCl₃ / TMS, 500 MHz): 8.11–8.09 (4H, m, ArH), 7.63–7.59 (2H, m, ArH), 7.49–7.46 (4H, m, ArH), 5.09 (4H, s, CH₂), 4.51–4.49 (2H, m, CH₂), 4.13–4.11 (2H, m, CH₂). The colorless crystals were identified as 1,3-dioxolane-2,2-dimethylbenzene ester.

[0115]

[0116] Preparation Example 2

[0117] Preparation of 1,3-dioxane-2,2-diethanol dibenzoate (ID-2):

[0118] The preparation method is the same as in Example 1, except that ethylene glycol is replaced with 1,3-propanediol.

[0119] Colorless crystals were obtained. Analysis by 1H NMR (δ, ppm, CDCl3 / TMS, 500 MHz) showed the following precipitates: 8.11-8.09 (2H, m, ArH), 8.07-8.05 (2H, m, ArH), 7.63-7.60 (1H, m, ArH), 7.58-7.54 (1H, m, ArH), 7.49-7.46 (2H, m, ArH), 7.44-7.41 (2H, m, ArH), 5.09 (2H, s, CH2), 4.65 (2H, s, CH2), 4.06-4.04 (4H, t, CH2), 1.86-1.81 (2H, quintet, CH2). The crystals were identified as 1,3-dioxane-2,2-dimethylbenzene dibenzoate.

[0120] Preparation Example 3

[0121] Preparation of 1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester (ID-3):

[0122] The preparation method is the same as in Example 1, except that 1,3-dihydroxyacetone dibenzoate is replaced with 1,3-dihydroxyacetone di(4-butylbenzoic acid) ester.

[0123] Colorless crystals were obtained. Analysis by 1H NMR (δ, ppm, CDCl3 / TMS, 500 MHz): 7.92-7.90 (4H, m, ArH), 7.18-7.16 (4H, m, ArH), 4.97 (4H, s, CH2), 4.40-4.36 (2H, m, CH2), 4.03-3.96 (2H, m, CH2), 2.59-2.56 (4H, t, CH2), 1.55-1.49 (4H, quintet, CH2), 1.30-1.23 (4H, sextet, CH2), 0.85-0.82 (6H, t, CH3). The crystals were identified as 1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester.

[0124] Preparation Example 4

[0125] Preparation of 4-n-butyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester (ID-4):

[0126] The preparation method is the same as in Example 1, except that ethylene glycol is replaced with 1,2-hexanediol and 1,3-dihydroxyacetone dibenzoate is replaced with 1,3-dihydroxyacetone di(4-butylbenzoic acid) ester.

[0127] The obtained colorless crystals were analyzed by 1H NMR (δ, ppm, CDCl3 / TMS, 500 MHz): 7.92-7.90 (4H, m, ArH), 7.17-7.15 (4H, m, ArH), 4.91 (4H, s, CH2), 4.39-4.35 (2H, m, CH2), 4.06-3.98 (1H, m, CH), 2.59-2.55 (4H, t, CH2), 1.56-1.47 (4H, quintet, CH2), 1.38-1.22 (10H, m, CH2), 0.89-0.82 (9H, m, CH3), and identified as 4-n-butyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester.

[0128] Preparation Example 5

[0129] Preparation of 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol dibenzoate (ID-5):

[0130] The preparation method is the same as in Example 1, except that ethylene glycol is replaced with 2-methyl-2,4-pentanediol.

[0131] The obtained colorless crystals were analyzed by 1H NMR (δ, ppm, CDCl3 / TMS, 500 MHz): 8.11-8.09 (2H, m, ArH), 8.08-8.05 (2H, m, ArH), 7.63-7.59 (1H, m, ArH), 7.58-7.54 (1H, m, ArH), 7.49-7.45 (2H, m, ArH), 7.44-7. 40 (2H, m, ArH), 5.08 (2H, s, CH2), 4.66 (2H, s, CH2), 4.01-3.95 (1H, m, CH), 1.77-1.72 (2H, m, CH2), 1.26-1.18 (9H, m, CH3), identified as 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol dibenzoate.

[0132]

[0133] Examples 1-8

[0134] Step (1) Preparation of catalyst components

[0135] Nitrogen gas was introduced into the reactor to create a nitrogen atmosphere. Magnesium chloride 4.8 g, toluene 95 mL, epichlorohydrin 4 mL, and tributyl phosphate (TBP) 12.5 mL were added sequentially. The mixture was heated to 50 °C with stirring and maintained for 2.5 h.

[0136] After the solid has completely dissolved, add 1.4 g of phthalic anhydride, cool the solution to -25°C, add 56 mL of TiCl4 dropwise over 1 hour, maintain this temperature for 1 hour, and then slowly raise the temperature to 80°C. During the heating process, the solid gradually precipitates out.

[0137] Then, 6 mmol of the internal electron donor compound from Table 1 was added, and the mixture was kept at 80 °C for 1 h. After hot filtration, the resulting solid precipitate was washed twice with 150 mL of toluene. Then, 60 mL of toluene and 40 mL of TiCl4 were added to the washed solid precipitate, the temperature was raised to 110 °C, and the mixture was kept at 2 h before filtration. Then, 60 mL of toluene and 40 mL of TiCl4 were added to the resulting solid precipitate, the temperature was raised to 110 °C, and the mixture was kept at 2 h before filtration. Then, 70 mL of toluene was added to the resulting solid precipitate, and the mixture was washed at 110 °C. The washing was repeated three times, with each washing time being 10 min. Then, 60 mL of hexane was added to the washed solid precipitate, and the mixture was washed at room temperature. The washing was repeated twice, and then the mixture was dried under vacuum to obtain the solid catalyst component.

[0138] Step (2) Propylene polymerization experiment

[0139] In a 5L stainless steel reactor, after sufficient replacement with gaseous propylene, 2.5 mmol of AlEt3 (triethylaluminum) and 0.1 mmol of cyclohexylmethyldimethoxysilane (CHMDMS) were added to make Al:Si (mol) = 25:1. Then, 9 mg of the solid catalyst component prepared in step (1) and 1.2L of hydrogen were added, and 2.3L of liquid propylene was introduced. The temperature was raised to 70℃ for polymerization reaction and maintained at this temperature for 1h to obtain PP resin.

[0140] The melt index, isotactic index, and catalytic activity data of the prepared PP resin are shown in Table 1.

[0141] Example 9

[0142] The catalyst components were prepared and olefin polymerization was carried out in the same manner as in Example 1, except that in step (2) propylene polymerization, 0.05 mmol cyclohexylmethyldimethoxysilane was replaced with 0.05 mmol tetramethoxysilane.

[0143] Example 10

[0144] The catalyst components were prepared and olefin polymerization was carried out in the same manner as in Example 2. The difference was that in step (2) propylene polymerization experiment, after the gaseous propylene was fully replaced in a 5L stainless steel reactor, 32.5 mmol of AlEt and 0.012 mmol of methylcyclohexyldimethoxysilane (CHMDMS) were added to make Al:Si (mol) = 200:1. Then, 9 mg of the solid catalyst component prepared in step (1) and 1.2L of hydrogen were added, and 2.3L of liquid propylene was introduced. The temperature was raised to 70°C to carry out the polymerization reaction. This temperature was maintained for 1h to obtain PP resin.

[0145] The melt index, isotactic index, and catalytic activity data of the prepared PP resin are shown in Table 1.

[0146] Comparative Example 1

[0147] The catalyst component was prepared and propylene polymerization was carried out in the same manner as in Example 3, except that in step (1) of preparing the catalyst component, DE-1 (2-isopropyl-2-isopentyl-1,3-dimethoxypropane) was replaced with an equimolar amount of ID-1; thus, the catalyst component was obtained.

[0148] The melt index, isotactic index, and catalytic activity data of the prepared PP resin are shown in Table 1.

[0149] Comparative Example 2

[0150] The catalyst component was prepared and propylene polymerization was carried out in the same manner as in Example 3, except that in step (1) of preparing the catalyst component, ID-1 was replaced with an equimolar amount of DE-1; thus, the catalyst component was obtained.

[0151] The melt index, isotactic index, and catalytic activity data of the prepared PP resin are shown in Table 1.

[0152] Comparative Example 3

[0153] The catalyst component was prepared and propylene polymerization was carried out in the same manner as in Example 4, except that in step (1) of preparing the catalyst component, ID-1 was replaced with an equimolar amount of DE-2 (9,9-di(methoxymethyl)fluorene); thus obtaining the catalyst component.

[0154] The melt index, isotactic index, and catalytic activity data of the prepared PP resin are shown in Table 1.

[0155] Comparative Example 4

[0156] The catalyst component was prepared and propylene polymerization was carried out in the same manner as in Example 3, except that in step (1) the molar ratio of ID-1 to DE-1 was 1:150 in the preparation of the catalyst component; thus, the catalyst component was obtained.

[0157] The melt index, isotactic index, and catalytic activity data of the prepared PP resin are shown in Table 1.

[0158] Comparative Example 5

[0159] The catalyst component was prepared and olefin polymerization was carried out in the same manner as in Example 2, except that in step (1) of preparing the catalyst component, ID-1 was replaced with an equimolar amount of ethyl benzoate (EB); thus, the catalyst component was obtained.

[0160] The melt index, isotactic index, and catalytic activity data of the prepared PP resin are shown in Table 1.

[0161] Comparative Example 6

[0162] The catalyst component was prepared and olefin polymerization was carried out according to the method of Example 2, except that in step (1) of the preparation of the catalyst component, DE-1 was replaced with an equimolar amount of ethyl benzoate.

[0163] Table 1

[0164]

[0165]

[0166] As shown in Table 1, using a combination of 1,3-dioxane-2,2-diethanol diesters and diethers with specific structures as internal electron donors as catalyst components can maintain the high polymerization activity of the catalyst (reaching above 28.8 kg PP / gcat) while broadening the molecular weight distribution of the polymer (reaching above 5.2), and simultaneously improving the melt index (reaching above 6 g / 10 min) and isotactic index (reaching 96.8%) of the obtained polymer.

[0167] As can be seen from the above examples and comparative examples, compared with Example 9, in which cyclohexylmethyldimethoxysilane and tetramethoxysilane are combined as external electron donors in the catalyst, the external electron donor in the catalyst of Example 1 of the present invention is cyclohexylmethyldimethoxysilane, which is combined with 1,3-dioxane-2,2-diethanol diester and diether compounds as internal electron donors for catalyzing olefin polymerization. This not only effectively improves the polymerization activity of the catalyst, but also results in olefin polymers with higher isotactic index.

[0168] Compared to Example 10, where the amounts of alkylaluminum, organosilane external electron donors, and internal electron donors in the catalyst are not within the preferred range, Example 2 of the present invention uses a catalyst prepared with preferred amounts of alkylaluminum, organosilane external electron donors, and internal electron donors for olefin polymerization, which has a higher isotactic index. At the same time, the resulting polyolefin also has a higher isotactic index and a wider molecular weight distribution.

[0169] Compared to Comparative Example 1, which used ID-1 alone as an internal electron donor, the catalyst prepared in Example 3 using ID-1 and DE-1 in combination as internal electron donors exhibits higher catalytic activity for olefin polymerization, reaching over 46.3 kg PP / gcat, and effectively improves the isotactic index of the olefin polymer (reaching over 97.5%).

[0170] Compared to Comparative Example 2, which used only DE-1 as an internal electron donor, Example 2 used a combination of ID-1 and DE-1 as internal electron donors to prepare a catalyst. The olefin polymer obtained by catalyzing olefin polymerization had a higher melt index and molecular weight distribution (MWD), with a melt index reaching 6.6 g / 10 min and a molecular weight distribution reaching 5.3. It also had a high isotactic index (reaching 97.6%), and the prepared catalyst also had high catalytic activity.

[0171] Compared to Comparative Example 3, which used only DE-2 as an internal electron donor, Example 4 used a combination of ID-1 and DE-2 as internal electron donors to prepare a catalyst. The olefin polymer obtained by catalyzing olefin polymerization had a higher melt index and molecular weight distribution (MWD), with a melt index reaching 6.4 g / 10 min and a molecular weight distribution reaching 5.2. It also had a high isotactic index, and the prepared catalyst also had high catalytic activity.

[0172] Compared to Comparative Example 4, which used an ID-1:DE-1 = 1:150 blend as an internal electron donor, Example 3 used a preferred ID-1:DE-1 = 1:4 blend as an internal electron donor to prepare a catalyst for olefin polymerization. The resulting olefin polymer had a higher melt index (up to 6.6 g / 10 min) and a wider molecular weight distribution (up to 5.3), as well as a higher isotactic index and catalytic activity.

[0173] Compared to Comparative Example 5, which uses EB and DE-1 as internal electron donors, and Comparative Example 6, which uses EB and ID-1 as internal electron donors, Example 2 uses a catalyst prepared with the preferred DE-1 and ID-1 combination as internal electron donors for olefin polymerization. This not only effectively improves the isotactic index and melt index of the olefin polymer and makes the molecular weight distribution of the polymer wider, but also improves the polymerization activity of the catalyst.

[0174] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A catalyst component for olefin polymerization, characterized in that, The catalyst components include magnesium, titanium, halogens and internal electron donor compounds, wherein the internal electron donor compounds include a first internal electron donor compound represented by general formula (I) and a second internal electron donor compound represented by general formula (II); The molar ratio of the first internal electron donor compound to the second internal electron donor compound is 1:0.01-100; In general formula (I), R1-R4 are each independently selected from hydrogen, C1-C 12 Straight-chain alkyl, C3-C 12 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 12 alkenyl, C2-C 12 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl, C4-C 20 Heterocyclic groups, halogens, hydroxyl groups, cyano groups, C1-C 12 Alkoxy and C1-C 12 At least one of the acyl groups; for R1-R4, the C1-C 12 Straight-chain alkyl, C1-C 12 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 12 alkenyl, C2-C 12 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl, C4-C 20 Heterocyclic group, hydroxyl group, C1-C 12 Alkoxy and C1-C 12 The hydrogen atom on the acyl group may optionally be replaced by a substituent; R5 and R6 are each independently selected from C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl and C4-C 15 At least one of the heterocyclic groups; for R5 and R6, the C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C3-C 12 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 20 Aryl, C7-C 20 Hydrocarbon aryl, C7-C 20 Aromatic group, C6-C 20 heteroaryl and C4-C 15 The hydrogen atom on the heterocyclic group may optionally be substituted with a substituent; n is an integer between 0 and 4; In general formula (II), R7 and R8 are each independently selected from C1-C 10 Straight-chain alkyl, C3-C 15 Branched alkyl, C3-C 15 Cyclic hydrocarbon group, C6-C 20 aryl, C7-C 20 aryl hydrocarbons and C7-C 20 At least one of the aromatic groups; for R7 and R8, the C1-C 10 Straight-chain alkyl, C3-C 15 Branched alkyl, C3-C 15 Cyclic hydrocarbon group, C6-C 20 aryl, C7-C 20 aryl hydrocarbons and C7-C 20 The hydrogen atom on the aromatic group can be optionally substituted with a substituent; R7 and R8 can be arbitrarily connected to form a ring; In R1-R4, R5-R6 and R7-R8, each substituent is independently selected from at least one of -OH, -NH2, C1-C6 alkyl-substituted amino, -CHO, -COOH, halogen, C1-C6 alkyl and C1-C6 alkoxy.

2. The catalyst component according to claim 1, characterized in that, R1-R4 are each independently selected from C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl, C5-C 10 Cyclic hydrocarbon group, C2-C 10 alkenyl, C2-C 10 alkynyl group, C6-C 18 Aryl, C7-C 18 Hydrocarbon aryl, C7-C 18 Aromatic group, C6-C 18 heteroaryl, C4-C 18 Heterocyclic groups and C1-C 10 At least one of alkoxy groups; preferably, R1-R4 are each independently selected from at least one of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloheptyl, cyclooctyl, phenyl, 4-methylphenyl, 4-ethylphenyl, benzyl; more preferably, R1-R4 are each independently selected from at least one of C1-C4 straight-chain alkyl, C3-C4 branched-chain alkyl, C5-C8 cycloalkyl, C2-C5 alkenyl, C6-C9 aryl, C7-C9 alkylaryl, C7-C9 aryl, C6-C9 heteroaryl, and C1-C4 alkoxy groups; And / or, R5 and R6 are each independently selected from C1-C8 straight-chain alkyl, C3-C8 branched alkyl, C4-C6 branched alkyl, C5-C6 branched alkyl, C6-C6 branched alkyl, C7-C8 branched alkyl, C8-C6 ... 10 Cyclic hydrocarbon group, C2-C8 alkenyl group, C2-C8 alkynyl group, C6-C 15 Aryl, C7-C 15 Hydrocarbon aryl, C7-C 15 Aromatic group, C6-C 15 heteroaryl and C4-C 12 At least one of the heterocyclic groups; preferably, R5 and R6 are each independently selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloheptyl, cyclooctyl, phenyl, naphthyl, 4-methylphenyl, 4-ethylphenyl, 4-n-propyl At least one of phenyl, 4-isopropylphenyl, 4-n-butylphenyl, 4-isobutylphenyl, 4-tert-butylphenyl, 4-methoxyphenyl, 4-ethoxyphenyl, 2-methylphenyl, 2,4,6-trimethylphenyl, benzyl, phenethyl, phenyl-n-propyl, phenyl-n-butyl, phenyl-tert-butyl, phenyl-isopropyl, and phenyl-n-pentyl; more preferably, R5 and R6 are each independently selected from C1-C4 straight-chain alkyl, C3-C4 branched alkyl, C5-C8 cyclic hydrocarbon, C2-C5 alkenyl, C6-C 10 Aryl, C7-C 10 Hydrocarbon aryl, C7-C 10 Aromatic groups and C4-C 12 At least one of the heterocyclic groups; And / or, R7 and R8 are each independently selected from C 1- C8 straight-chain alkyl, C3-C 10 Branched alkyl, C3-C 10 cycloalkyl, C6-C 15 Aryl, C7-C 15 Alkyl and C7-C 15 At least one of the aryl groups.

3. The catalyst component according to claim 1 or 2, characterized in that, The first internal electron-donating compound is selected from 1,3-dioxolane-2,2-diethanol dibenzoate, 1,3-dioxolane-2,2-diethanol dicarboxylate, 1,3-dioxolane-2,2-diethanol diacetate, 1,3-dioxolane-2,2-diethanol dipropionate, 1,3-dioxolane-2,2-diethanol dibutyrate, 1,3-dioxolane-2,2-diethanol divalerate, 1,3-dioxolane-2,2-diethanol di(p-chlorobenzoic acid), 1,3-dioxolane-2,2-diethanol di(m-chlorobenzoic acid), 1,3-dioxolane-2,2-diethanol di(p-bromobenzoic acid), 1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 1,3 Dioxolane-2,2-dimethyldi(4-methylbenzoic acid) ester, 1,3-dioxolane-2,2-dimethyldi(4-ethylbenzoic acid) ester, 1,3-dioxolane-2,2-dimethyldi(4-propylbenzoic acid) ester, 1,3-dioxolane-2,2-dimethyldi(4-butylbenzoic acid) ester, 1,3-dioxolane-2,2-dimethyldi(4-methoxybenzoic acid) ester, 1,3-dioxolane-2,2-dimethyldi(4-ethoxybenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-dimethyldibenzoate, 4-methyl-1,3-dioxolane-2,2-dimethyldicarboxylate, 4-methyl-1,3-dioxolane-2,2-dimethyldiacetate, 4-methyl 4-Methyl-1,3-dioxolane-2,2-diethanol dipropionate, 4-methyl-1,3-dioxolane-2,2-diethanol dibutyrate, 4-methyl-1,3-dioxolane-2,2-diethanol divalerate, 4-methyl-1,3-dioxolane-2,2-diethanol di(p-chlorobenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(m-chlorobenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(p-bromobenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(4-methylbenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(4-methylbenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(4-methylbenzoic acid), 4-methyl-1,3-dioxolane-2,2-diethanol di(4-methylbenzoic acid), 2-Dimethyl di(4-ethylbenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-propylbenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-butylbenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-methoxybenzoic acid) ester, 4-methyl-1,3-dioxolane-2,2-dimethyl di(4-ethoxybenzoic acid) ester, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl dibenzoate, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl dicarboxylate, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl diacetate, 4,5-dimethyl-1,3-dioxolane-2,2-dimethyl diacetate, 4,5-dimethyl-1,3-Dioxolane-2,2-diethanol dipropionate, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol dibutyrate, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol divalerate, 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(p-chlorobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(m-chlorobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(p-bromobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(o-bromobenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-methylbenzoic acid), 4,5-Dimethyl-1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid), 4,5-dimethyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol dibenzoate, 4-ethyl-1,3-dioxolane-2,2-diethanol dicarboxylate ... 2-Dimethyl diacetate, 4-ethyl-1,3-dioxolane-2,2-dimethyl dipropionate, 4-ethyl-1,3-dioxolane-2,2-dimethyl dibutyrate, 4-ethyl-1,3-dioxolane-2,2-dimethyl divalerate, 4-ethyl-1,3-dioxolane-2,2-dimethyl di(p-chlorobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-dimethyl di(m-chlorobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-dimethyl di(p-bromobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-dimethyl di(o-bromobenzoic acid), 4-ethyl-1,3-dioxolane-2,2-dimethyl di(4-methylbenzoic acid), 4-ethyl 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-ethylbenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid), 4-ethyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid), 4-butyl-1,3-dioxolane-2,2-diethanol dibenzoate, 4-butyl-1,3-dioxolane-2,2-diethanol dicarboxylate, 4-butyl-1,3-dioxolane-2,2-diethanol diacetate ...3-Dioxolane-2,2-dimethylpropionate, 4-Butyl-1,3-dioxolane-2,2-dimethyldibutyrate, 4-Butyl-1,3-dioxolane-2,2-dimethyldivalerate, 4-Butyl-1,3-dioxolane-2,2-dimethyldi(p-chlorobenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(m-chlorobenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(p-bromobenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(o-bromobenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(4-methylbenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(4-methylbenzoic acid), 4-Butyl-1,3-dioxolane-2,2-dimethyldi(4-methylbenzoic acid) Di(4-ethylbenzoic acid) ester, 4-butyl-1,3-dioxolane-2,2-diethanol di(4-propylbenzoic acid) ester, 4-butyl-1,3-dioxolane-2,2-diethanol di(4-butylbenzoic acid) ester, 4-butyl-1,3-dioxolane-2,2-diethanol di(4-methoxybenzoic acid) ester, 4-butyl-1,3-dioxolane-2,2-diethanol di(4-ethoxybenzoic acid) ester, 1,3-dioxane-2,2-diethanol dibenzoate, 1,3-dioxane-2,2-diethanol dicarboxylate, 1,3-dioxane-2,2-diethanol diacetate, 1,3-dioxane-2,2-diethanol dipropionate, 1,3-dioxane-2,2-diethanol diacetate Butyrate, 1,3-dioxane-2,2-diethanol divalerate, 1,3-dioxane-2,2-diethanol di(p-chlorobenzoic acid), 1,3-dioxane-2,2-diethanol di(m-chlorobenzoic acid), 1,3-dioxane-2,2-diethanol di(p-bromobenzoic acid), 1,3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 1,3-dioxane-2,2-diethanol di(4-methylbenzoic acid), 1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid), 1,3-dioxane-2,2-diethanol di(4-propylbenzoic acid), 1,3-dioxane-2,2-diethanol di(4-butylbenzoic acid), 1,3-dioxane 2,2-Dimethanol di(4-methoxybenzoic acid) ester, 1,3-dioxane-2,2-dimethanol di(4-ethoxybenzoic acid) ester, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol dibenzoate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol dicarboxylate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol diacetate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol dipropionate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol dibutyrate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol divalerate, 4,4,6-trimethyl-1,3-dioxane-2,2-dimethanol divalerate, 4,4,6-trimethyl-1,3-Dioxane-2,2-diethanol di(p-chlorobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(m-chlorobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(p-bromobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-methylbenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-propylbenzoic acid), 4, 4,6-Trimethyl-1,3-dioxane-2,2-diethanol di(4-butylbenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-methoxybenzoic acid), 4,4,6-trimethyl-1,3-dioxane-2,2-diethanol di(4-ethoxybenzoic acid), 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol dibenzoate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol dicarboxylate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol diacetate, 4,4,6,6-tetramethyl-1,3-dioxane-2,2-diethanol dipropionate, 4, 4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol dibutyrate, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol divalerate, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(p-chlorobenzoic acid), 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(m-chlorobenzoic acid), 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(p-bromobenzoic acid), 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-methyl) 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid) ester, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-propylbenzoic acid) ester, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-butylbenzoic acid) ester, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-methoxybenzoic acid) ester, 4,4,6,6-Tetramethyl-1,3-dioxane-2,2-diethanol di(4-ethoxybenzoic acid) ester, 4,7-Dimethyl-1,3-dioxane-2,2-diethanol dibenzoate, 4,7-Dimethyl-1,3-dioxane-2,2-diethanol dibenzoate,3-Dioxane-2,2-dimethyldicarboxylate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldiacetate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldipropionate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldibutyrate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldivalerate, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldi(p-chlorobenzoic acid) ester, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldi(m-chlorobenzoic acid) ester, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldi(p-bromobenzoic acid) ester, 4,7-dimethyl-1,3-dioxane-2,2-dimethyldi(p-bromobenzoic acid) ester, 4,7-dimethyl-1, At least one of the following: 3-dioxane-2,2-diethanol di(o-bromobenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-methylbenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-ethylbenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-propylbenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-butylbenzoic acid), 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-methoxybenzoic acid), and 4,7-dimethyl-1,3-dioxane-2,2-diethanol di(4-ethoxybenzoic acid).

4. The catalyst component according to any one of claims 1-3, characterized in that, The second internal electron-donating compound is selected from 2,2-dimethyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-di-n-propyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-di-n-butyl-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-di-n-pentyl-1,3-dimethoxypropane, 2,2-diisopentyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-n-propyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-n-butyl -1,3-Dimethoxypropane, 2-Methyl-2-isobutyl-1,3-dimethoxypropane, 2-Methyl-2-n-pentyl-1,3-dimethoxypropane, 2-Methyl-2-isobutyl-1,3-dimethoxypropane, 2-Ethyl-2-n-propyl-1,3-dimethoxypropane, 2-Ethyl-2-isopropyl-1,3-dimethoxypropane, 2-Ethyl-2-n-butyl-1,3-dimethoxypropane, 2-Ethyl-2-isobutyl-1,3-dimethoxypropane, 2-Ethyl-2-n-pentyl-1,3-dimethoxypropane, 2-Ethyl-2-isobutyl-1,3-dimethoxypropane, 2-Ethyl-2-n-pentyl-1,3-dimethoxypropane, 2-Ethyl-2-isobutyl-1,3-dimethoxypropane, 2-n-propyl-2-n-butyl-1 3-Dimethoxypropane, 2-n-propyl-2-isobutyl-1,3-dimethoxypropane, 2-n-propyl-2-n-pentyl-1,3-dimethoxypropane, 2-n-propyl-2-isopentyl-1,3-dimethoxypropane, 2-isopropyl-2-isobutyl-1,3-dimethoxypropane, 2-isopropyl-2-n-pentyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, 2-n-butyl-2-isobutyl-1,3-dimethoxypropane, 2-n-butyl-2-n-pentyl-1,3-dimethoxypropane, 2-n-butyl-2-isopentyl-1,3-dimethoxypropane, 2-isobutyl-2-n-pentyl-1,3-dimethoxypropane, 2-isobutyl- 2-Isopentyl-1,3-dimethoxypropane, 2-isobutyl-2-phenyl-1,3-dimethoxypropane, 2-isopentyl-2-phenyl-1,3-dimethoxypropane, 2-(2-methyl-n-butyl)-2-benzyl-1,3-dimethoxypropane, 2-(2-ethylbutyl)-2-phenyl-1,3-dimethoxypropane, 2-(2-ethylhexyl)-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-ethyl-2-phenyl-1,3-dimethoxypropane, 2-isobutyl-2-benzyl-1,3-dimethoxypropane, 2-isopentyl-2-benzyl-1,3-dimethoxypropane, 2-(2-ethylbutyl)-2-benzyl-1,3-dimethoxypropane3-Dimethoxypropane, 2-(2-ethylhexyl)-2-benzyl-1,3-dimethoxypropane, 2-n-propyl-2-benzyl-1,3-dimethoxypropane, 2-isopropyl-2-benzyl-1,3-dimethoxypropane, 2-isobutyl-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-isopentyl-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-(2-methylbutyl)-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-(2-ethylhexyl)-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-methyl-2-(2-ethylbutyl)-1,3-dimethoxypropane, 2-ethyl-2 At least one of the following: (2-ethylbutyl)-1,3-dimethoxypropane, 2-isobutyl-2-(2-methylbutyl)-1,3-dimethoxypropane, 2-isopentyl-2-(2-methylbutyl)-1,3-dimethoxypropane, 2-(2-ethylhexyl)-2-(2-methylbutyl)-1,3-dimethoxypropane, 2-isobutyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopentyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-di(2-methylbutyl)-1,3-dimethoxypropane, 2,2-di(2-ethylhexyl)-1,3-dimethoxypropane, and 9,9-di(methoxymethyl)fluorene.

5. The catalyst component according to any one of claims 1-4, characterized in that, The molar ratio of the first internal electron donor compound to the second internal electron donor compound is 1:0.02-50, preferably 1:0.05-20, and more preferably 1:0.2-6; And / or, the magnesium in the catalyst component is derived from magnesium compounds; Preferably, the magnesium compound includes at least one of magnesium dihalide, magnesium alkoxy, alkyl magnesium, magnesium dihalide hydrate, magnesium dihalide alcohol, derivatives of magnesium dihalide in which the halogen atom is replaced by an alkoxy group, and derivatives of magnesium dihalide in which the halogen atom is replaced by a haloalkoxy group. More preferably, the alkoxy group in the magnesium dihalide derivative in which the halogen atom is replaced by an alkoxy group is C1-C. 10 alkoxy groups; Preferably, the magnesium compound is selected from magnesium dihalides and / or magnesium dihalides alcohols, more preferably from at least one of magnesium dichloride, magnesium dibromide, magnesium diiodide, magnesium dichloride alcohols, magnesium dibromide alcohols, and magnesium diiodide alcohols. And / or, the titanium in the catalyst component is derived from titanium compounds; Preferably, the titanium compound comprises the general formula TiX. m (OR 1 ) 4-m At least one of the compounds, the TiX m (OR 1 ) 4-m R in 1 For C1-C 20 Alkyl groups, where X is a halogen, and 1 ≤ m ≤ 4; More preferably, R 1 For C1-C 10 Alkyl groups, preferably C1-C6 alkyl groups; More preferably, the titanium compound is selected from at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tetrabutoxy, titanium tetraethoxy, titanium monochlorotriethoxy, titanium dichlorodiethoxy, and titanium trichloromonoethoxy. And / or, the molar ratio of the magnesium, titanium, halogen and the internal electron donor compound is 1:0.5-150:0.1-800:0.02-0.4, more preferably 1:0.5-50:1-200:0.05-0.

2.

6. A catalyst for olefin polymerization, characterized in that, The catalyst comprises the catalyst component of any one of claims 1-5, an organoaluminum compound, and optionally an external electron donor compound.

7. The catalyst according to claim 6, characterized in that, The external electron donor compound includes an organosilicon compound, the general formula of which is R. 3 k Si(OR 4 ) 4-k 0≤k≤3, preferably 1≤k≤3; R 3 Selected from halogens, hydrogen, C1-C 20 Alkyl, C3-C 20 Cyclic hydrocarbon group, C6-C 20 Aryl, C1-C 20 At least one of alkyl halogens and amino groups; R 4 Selected from C1-C 20 Alkyl, C3-C 20 Cyclic hydrocarbon group, C6-C 20 Aryl, C1-C 20 At least one of alkyl halogens and amino groups; Preferably, the organosilicon compound is selected from at least one of trimethylmethoxysilane, trimethylethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, dicyclopentyldimethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, di-n-propyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, n-propyltrimethoxysilane, isopropyltrimethoxysilane, n-butyltrimethoxysilane, isobutyltrimethoxysilane, vinyltrimethoxysilane, phenyltrimethoxysilane, n-propyltriethoxysilane, isopropyltriethoxysilane, n-butyltriethoxysilane, isobutyltriethoxysilane, phenyltriethoxysilane, cyclohexylmethyldimethoxysilane, and methyltert-butyldimethoxysilane.

8. The catalyst according to claim 6 or 7, characterized in that, The organoaluminum compound is an alkylaluminum compound; Preferably, the alkylaluminum compound has the general formula AlR 2 j X 3-j The R 2 It is hydrogen or C1-C 20 Hydrocarbon group, preferably hydrogen or C1-C8 alkyl, X is a halogen, 1≤j≤3; More preferably, the alkylaluminum compound is selected from at least one of triethylaluminum, tripropylaluminum, tri-n-butylaluminum, triisobutylaluminum, tri-n-octylaluminum, triisooctylaluminum, diethylaluminum monohydrogen, diisobutylaluminum monohydrogen, diethylaluminum monochloro, diisobutylaluminum monochloro, sesquiethylaluminum chloride, and diethylaluminum dichloro. And / or, the molar ratio of aluminum to titanium in the alkylaluminum compound is 5-1000:1, preferably 25-100:1; And / or, the molar ratio of silicon to titanium in the external electron donor compound is 0.1-500:1, preferably 25-100:

1.

9. The use of the catalyst component of any one of claims 1-5 or the catalyst of any one of claims 6-8 in olefin polymerization reactions.

10. A method for olefin polymerization, characterized in that, The method includes: contacting an olefin with a catalyst component according to any one of claims 1-5 or a catalyst according to any one of claims 6-8 under olefin polymerization conditions to carry out a polymerization reaction; Preferably, the method further includes: prepolymerizing the olefin by contacting the catalyst component or catalyst prior to the polymerization reaction; Preferably, the olefin comprises an olefin as shown in the general formula CH2=CHR, wherein R is hydrogen, C1-C2, C2 ... 12 Alkyl or C1-C 12 aryl; More preferably, R is a C1-C6 alkyl group; More preferably, the olefin is selected from at least one of ethylene, propylene, 1-butene, 4-methyl-1-pentene, and 1-hexene; And / or, the conditions for the polymerization reaction include: a polymerization temperature of 0 to 150°C, preferably 60 to 90°C; The polymerization pressure is 0.01-10 MPa, preferably 0.01-6 MPa; And / or, the conditions for the prepolymerization reaction include: a polymerization temperature of -40 to 80°C, preferably -20 to 50°C; The polymerization pressure is 0.01-10 MPa, preferably 0.01-6 MPa.

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