Solid catalyst component for the polymerization of olefins, catalyst and use thereof

Abstract

This invention discloses a solid catalyst component for olefin polymerization, the catalyst, and its application. The solid catalyst component comprises titanium, magnesium, halogen, and an electron-donating compound selected from compounds of general formula (I): wherein R 1 Selected from hydrogen or C1-C 18 Alkyl group; R 2 Selected from C1-C 18 Alkyl group; R is selected from C1-C 18 Alkyl groups, with or without substituents, C6-C 30 aryl, with or without substituents, C7-C 30 Aryl groups, with or without substituents, C5-C 30 Cycloalkyl groups. The novel solid catalyst component provided by this invention, along with the catalyst and prepolymerization catalyst prepared using said solid catalyst component, exhibits excellent overall performance. It demonstrates high activity in olefin polymerization, particularly propylene polymerization, and produces polypropylene with high isotacticity, showing promising application prospects.

Description

Technical Field

[0001] This invention relates to a solid catalyst component for olefin polymerization, and more specifically, to a solid catalyst component for olefin polymerization containing an ether ester electron donor compound. The invention also relates to a catalyst prepared from the above-mentioned solid catalyst component and its application in olefin polymerization. Background Technology

[0002] It is well known that titanium-containing solid catalyst components, with titanium, magnesium, halogens, and electron donors as basic components, can be used in the polymerization of olefins (CH2=CHR), especially in the polymerization of α-olefins with three or more carbon atoms, where polymers with high stereoregularity can be obtained in high yields. Electron donor compounds are an essential component of the catalyst, and the discovery of new internal electron donor compounds has led to the continuous upgrading of polyolefin catalysts. Currently, a large number of electron donor compounds have been disclosed, such as polycarboxylic acids, monocarboxylic acid esters or polycarboxylic acid esters, acid anhydrides, monoethers or polyethers, ketones, alcohols, amines and their derivatives, etc. Among them, aromatic dicarboxylic acid esters are more commonly used, such as di-n-butyl phthalate or diisobutyl phthalate. Catalysts containing phthalate diesters have low activity, and the resulting polymers have a narrow molecular weight distribution. External electron donors are required during polymerization to achieve high catalytic activity and obtain polymers with high isotacticity.

[0003] In the 1990s, Himont disclosed a class of 1,3-diether electron-donating compounds in Chinese patent CN1041752A. Using catalysts containing 1,3-diether compounds can yield highly isotactic polypropylene with high catalytic activity; however, the resulting polymer has a narrow molecular weight distribution, which is detrimental to polymer processing. Furthermore, 1,3-diether compounds are prepared by O-alkylation of the corresponding 1,3-diol. The synthesis process of the intermediate compound 1,3-diol involved in the preparation is complex and yields low amounts. The O-alkylation reaction conditions are harsh, requiring the use of strong bases such as potassium tert-butoxide or sodium hydride for dehydrogenation, and the O-alkylating agent iodomethane is a highly toxic chemical. Summary of the Invention

[0004] This invention provides a solid catalyst component containing a novel ether ester electron donor compound and the catalyst prepared therefrom, which exhibits excellent comprehensive performance. The solid catalyst component and the catalyst are used for olefin polymerization, especially propylene polymerization, and have high catalytic activity, good stereoregularity of the polymer, and have good application prospects.

[0005] A first aspect of the present invention is to provide a solid catalyst component comprising titanium, magnesium, a halogen, and an electron-donating compound, said electron-donating compound being selected from at least one of compounds of general formula (I):

[0006]

[0007] In equation (Ⅰ), R 1 Selected from hydrogen or C1-C 18 Alkyl group; R 2 Selected from C1-C 18 Alkyl group; R is selected from C1-C 18 Alkyl, with or without substituents, C6-C 30 aryl, with or without substituents, C7-C 30 Aryl groups, with or without substituents, C5-C 30 Cycloalkyl, i.e., R is selected from C1-C2. 18 Alkyl, with or without substituents, C6-C 30 aryl, with or without substituents, C7-C 30 Aryl groups, with or without substituents, C5-C 30 One of the cycloalkyl groups.

[0008] According to a preferred embodiment of the present invention, in the compound represented by general formula (I), R 1 It is selected from hydrogen or C1-C6 alkyl groups, preferably hydrogen or C1-C4 alkyl groups, and more preferably hydrogen, methyl, or ethyl.

[0009] According to a preferred embodiment of the present invention, R 2 The alkyl group is selected from C1-C6, preferably C1-C4, and more preferably methyl or ethyl.

[0010] According to a preferred embodiment of the present invention, R is selected from C1-C6 alkyl groups, with or without substituents, and C6-C6 alkyl groups. 20 aryl, with or without substituents, C7-C 20 Aryl groups, with or without substituents, C5-C 20 Cycloalkyl, preferably C1-C4 alkyl, with or without substituents, C6-C 10 aryl, with or without substituents, C7-C 10 Aryl groups, with or without substituents, C5-C 10 Cycloalkyl, more preferably C1-C3 alkyl, phenyl with or without substituents, naphthyl with or without substituents, benzyl with or without substituents, phenethyl with or without substituents, or cyclohexyl with or without substituents.

[0011] In one embodiment of the above-described solid catalyst components, in the compound represented by general formula (I), R 1 Selected from hydrogen or C1-C6 alkyl groups, preferably hydrogen or C1-C4 alkyl groups, more preferably hydrogen, methyl, or ethyl; R 2 The alkyl group selected from C1-C6, preferably C1-C4, more preferably methyl or ethyl; R is selected from C1-C6 alkyl, with or without substituents, C6-C 20 aryl, with or without substituents, C7-C 20 Aryl groups, with or without substituents, C5-C 20 Cycloalkyl, preferably C1-C4 alkyl, with or without substituents, C6-C 10 aryl, with or without substituents, C7-C 10 Aryl groups, with or without substituents, C5-C 10 Cycloalkyl, more preferably C1-C3 alkyl, phenyl with or without substituents, naphthyl with or without substituents, benzyl with or without substituents, phenethyl with or without substituents, or cyclohexyl with or without substituents.

[0012] According to a preferred embodiment of the present invention, the substituent is selected from C1-C2. 18 Alkyl, C1-C 18 The alkoxy group or halogen is preferably a C1-C6 alkyl group, a C1-C6 alkoxy group, or a halogen, more preferably a C1-C4 alkyl group, a C1-C4 alkoxy group, chlorine, or bromine, and most preferably methyl, ethyl, methoxy, ethoxy, or chlorine.

[0013] Specific examples of the compounds represented by general formula (I) in the above-mentioned solid catalyst components include:

[0014] The electron-donating compound is selected from at least one of the following compounds: 2-methoxyphenyl acetate, 2-methoxyphenyl propionate, 2-methoxyphenyl butyrate, 2-methoxyphenyl isobutyrate, 2-methoxyphenyl benzoate, 2-ethoxybenzoate, 2-methoxyphenyl benzoate, 2-ethylbenzoate, 2-methylbenzoate, 2-chlorobenzoate, 2-ethoxyphenyl benzoate, 4-methoxyphenyl benzoate, 4-methoxyphenyl benzoate, 4-ethylbenzoate, 4-methylbenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate. 2-Methoxyphenyl Naphthoic acid, 2-Methoxyphenyl 2-phenylacetic acid, 2-(2-ethoxyphenyl)acetic acid, 2-(2-methoxyphenyl)acetic acid, 2-(2-ethylphenyl)acetic acid, 2-(2-methylphenyl)acetic acid, 2-(2-chlorophenyl)acetic acid, 2-(4-ethoxyphenyl)acetic acid, 2-(4-methoxyphenyl)acetic acid, 2-(4-ethylphenyl)acetic acid, 2-(4-methylphenyl)acetic acid, 2-(4-chlorophenyl)acetic acid, 2-methoxyphenyl 3-phenylpropionic acid, 3-(2-ethoxyphenyl)acetic acid, 2-(2-ethoxyphenyl)acetic acid, 2-(4-ethylphenyl)acetic acid, 2-(4-methylphenyl)acetic acid, 2-(4-chlorophenyl)acetic acid, 2-methoxyphenyl 3-phenylpropionic acid, 2 ...4-ethylphenyl)acetic acid, 2-(4-ethylphenyl)acetic acid, 2-(4-chlorophenyl)acetic acid, 2-methoxyphenyl 3-phenylpropionic acid, 2-(2-ethoxyphenyl)acetic acid, 2-(4-ethylphenyl)acetic acid, 2-(4-ethylphenyl)acetic acid, 2-(4-ethylphenyl)acetic acid, 2-methoxyphenyl 3-phenylpropionic acid, 2-(2-ethoxyphenyl)acetic acid, 2-(2-ethylphenyl)acetic acid, 2-(4-ethylphenyl)acetic acid 2-Methoxyphenyl propionate, 3-(2-methoxyphenyl)propionate, 2-methoxyphenyl 3-(2-ethylphenyl)propionate, 2-methoxyphenyl 3-(2-methylphenyl)propionate, 2-methoxyphenyl 3-(2-chlorophenyl)propionate, 2-methoxyphenyl 3-(4-ethoxyphenyl)propionate, 2-methoxyphenyl 3-(4-methoxyphenyl)propionate, 2-methoxyphenyl 3-(4-ethylphenyl)propionate, 2-methoxyphenyl 3-(4-methylphenyl)propionate, 2-methoxyphenyl 3-(4-chlorophenyl)propionate, 2-methoxyphenyl cyclohexanecarboxylate, 2-ethoxyphenyl acetate, 2-ethoxyphenyl propionate, 2-ethoxyphenyl butyrate, 2-ethoxyphenyl isobutyrate, benzoyl... 2-Ethoxyphenyl ester, 2-Ethoxybenzoic acid 2-ethoxyphenyl ester, 2-Methoxybenzoic acid 2-ethoxyphenyl ester, 2-Ethoxyphenyl ester 2-Ethylbenzoic acid 2-ethoxyphenyl ester, 2-Methylbenzoic acid 2-ethoxyphenyl ester, 2-Chlorobenzoic acid 2-ethoxyphenyl ester, 4-Ethoxybenzoic acid 2-ethoxyphenyl ester, 4-Methoxybenzoic acid 2-ethoxyphenyl ester, 4-Ethylbenzoic acid 2-ethoxyphenyl ester, 4-Methylbenzoic acid 2-ethoxyphenyl ester, 4-Chlorobenzoic acid 2-ethoxyphenyl ester, 2,4,6-Trimethylbenzoic acid 2-ethoxyphenyl ester, 1-Naphthoic acid 2-ethoxyphenyl ester, 2-Phenylacetic acid 2-ethoxyphenyl ester, 2-(2-ethoxyphenyl)acetic acid 2-ethoxyphenyl ester, 2-(2-Methoxyphenyl)acetic acid 2-ethoxyphenyl ester2-(2-Ethylphenyl)acetic acid 2-ethoxyphenyl ester, 2-(2-Methylphenyl)acetic acid 2-ethoxyphenyl ester, 2-(2-Chlorophenyl)acetic acid 2-ethoxyphenyl ester, 2-(4-Ethoxyphenyl)acetic acid 2-ethoxyphenyl ester, 2-(4-Methoxyphenyl)acetic acid 2-ethoxyphenyl ester, 2-(4-Ethylphenyl)acetic acid 2-ethoxyphenyl ester, 2-(4-Methylphenyl)acetic acid 2-ethoxyphenyl ester, 2-(4-Chlorophenyl)acetic acid 2-ethoxyphenyl ester, 3-Phenylacetic acid 2-ethoxyphenyl ester, 3-(2-Ethoxyphenyl)propionic acid 2-ethoxyphenyl ester, 3-(2-Methoxyphenyl)propionic acid 2-ethoxyphenyl ester, 3-(2-Ethylphenyl)propionic acid 2-ethoxyphenyl ester, 3-(2-Methylphenyl)propionic acid 2- Ethoxyphenyl ester, 2-ethoxyphenyl 3-(2-chlorophenyl)propionic acid, 2-ethoxyphenyl 3-(4-ethoxyphenyl)propionic acid, 2-ethoxyphenyl 3-(4-methoxyphenyl)propionic acid, 2-ethoxyphenyl 3-(4-ethylphenyl)propionic acid, 2-ethoxyphenyl 3-(4-methylphenyl)propionic acid, 2-ethoxyphenyl 3-(4-chlorophenyl)propionic acid, 2-ethoxyphenyl cyclohexanecarboxylic acid, 2-methoxy-4-methylphenyl acetate, 2-methoxy-4-methylphenyl propionate, 2-methoxy-4-methylphenyl butyrate, 2-methoxy-4-methylphenyl isobutyrate, 2-methoxy-4-methylphenyl benzoate, 2-methoxy-4-methylphenyl 2-ethoxybenzoic acid, 2-methoxybenzoic acid 2-Methylbenzoic acid 2-methoxy-4-methylphenyl ester, 2-methylbenzoic acid 2-methoxy-4-methylphenyl ester, 2-chlorobenzoic acid 2-methoxy-4-methylphenyl ester, 4-ethoxybenzoic acid 2-methoxy-4-methylphenyl ester, 4-methoxybenzoic acid 2-methoxy-4-methylphenyl ester, 4-ethylbenzoic acid 2-methoxy-4-methylphenyl ester, 4-methylbenzoic acid 2-methoxy-4-methylphenyl ester, 4-chlorobenzoic acid 2-methoxy-4-methylphenyl ester, 2,4,6-trimethylbenzoic acid 2-methoxy-4-methylphenyl ester, 1-naphthoic acid 2-methoxy-4-methylphenyl ester, 2-phenylacetic acid 2-methoxy-4-methylphenyl ester, 2-(2-ethoxyphenyl)acetic acid 2-methoxy-4-methylphenyl ester 2-Methylphenyl ester, 2-(2-methoxyphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(2-ethylphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(2-methylphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(2-chlorophenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(4-ethoxyphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(4-methoxyphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(4-ethylphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(4-methylphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(4-chlorophenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-phenylpropionic acid 2-methoxy-4-methylphenyl ester2-Methoxy-4-methylphenyl 3-(2-ethoxyphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(2-methoxyphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(2-ethylphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(2-methylphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(2-chlorophenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(4-ethoxyphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(4-methoxyphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(4-ethylphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(4-methylphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(4-chlorophenyl)propionic acid 2-Methylphenyl ester, 2-methoxy-4-methylphenyl ester cyclohexanecarboxylic acid, 2-ethoxy-4-methylphenyl ester acetic acid, 2-ethoxy-4-methylphenyl ester propionic acid, 2-ethoxy-4-methylphenyl ester butyric acid, 2-ethoxy-4-methylphenyl ester isobutyric acid, 2-ethoxy-4-methylphenyl ester benzoic acid, 2-ethoxy-4-methylphenyl ester 2-ethoxybenzoic acid, 2-ethoxy-4-methylphenyl ester 2-ethylbenzoic acid, 2-ethoxy-4-methylphenyl ester 2-methylbenzoic acid, 2-ethoxy-4-methylphenyl ester 2-chlorobenzoic acid, 2-ethoxy-4-methylphenyl ester 4-ethoxybenzoic acid, 2-ethoxy-4-methylphenyl ester 4-methoxybenzoic acid, 4- 2-Ethoxy-4-methylphenyl ethylbenzoate, 2-ethoxy-4-methylphenyl 4-methylbenzoate, 2-ethoxy-4-methylphenyl 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 2-ethoxy-4-methylphenyl 1-naphthoic acid, 2-ethoxy-4-methylphenyl 2-phenylacetic acid, 2-ethoxy-4-methylphenyl 2-(2-ethoxyphenyl)acetic acid, 2-ethoxy-4-methylphenyl 2-(2-methoxyphenyl)acetic acid, 2-ethoxy-4-methylphenyl 2-(2-ethylphenyl)acetic acid, 2-ethoxy-4-methylphenyl 2-(2-methylphenyl)acetic acid, 2-ethoxy-4-methylphenyl 2-(2-chlorophenyl)acetic acid, 2 2-(4-ethoxyphenyl)acetic acid 2-ethoxy-4-methylphenyl ester, 2-(4-methoxyphenyl)acetic acid 2-ethoxy-4-methylphenyl ester, 2-(4-ethylphenyl)acetic acid 2-ethoxy-4-methylphenyl ester, 2-(4-methylphenyl)acetic acid 2-ethoxy-4-methylphenyl ester, 2-(4-chlorophenyl)acetic acid 2-ethoxy-4-methylphenyl ester, 3-phenylpropionic acid 2-ethoxy-4-methylphenyl ester, 3-(2-ethoxyphenyl)propionic acid 2-ethoxy-4-methylphenyl ester, 3-(2-methoxyphenyl)propionic acid 2-ethoxy-4-methylphenyl ester, 3-(2-ethylphenyl)propionic acid 2-ethoxy-4-methylphenyl ester, 3-(2-methylphenyl)propionic acid 2-ethoxy-4-methylphenyl ester2-Ethoxy-4-methylphenyl 3-(2-chlorophenyl)propionic acid, 2-ethoxy-4-methylphenyl 3-(4-ethoxyphenyl)propionic acid, 2-ethoxy-4-methylphenyl 3-(4-methoxyphenyl)propionic acid, 2-ethoxy-4-methylphenyl 3-(4-ethylphenyl)propionic acid, 2-ethoxy-4-methylphenyl 3-(4-methylphenyl)propionic acid, 2-ethoxy-4-methylphenyl 3-(4-chlorophenyl)propionic acid, 2-ethoxy-4-methylphenyl cyclohexanecarboxylate, 2-methoxy-4-ethylphenyl acetate, 2-methoxy-4-ethylphenyl propionate, 2-methoxy-4-ethylphenyl butyrate, 2-methoxy-4-ethylphenyl isobutyrate, 2-methoxy-4-ethylphenyl benzoate 2-Ethoxybenzoic acid 2-methoxy-4-ethylphenyl ester, 2-methoxybenzoic acid 2-methoxy-4-ethylphenyl ester, 2-ethylbenzoic acid 2-methoxy-4-ethylphenyl ester, 2-methylbenzoic acid 2-methoxy-4-ethylphenyl ester, 2-chlorobenzoic acid 2-methoxy-4-ethylphenyl ester, 4-ethoxybenzoic acid 2-methoxy-4-ethylphenyl ester, 4-methoxybenzoic acid 2-methoxy-4-ethylphenyl ester, 4-ethylbenzoic acid 2-methoxy-4-ethylphenyl ester, 4-methylbenzoic acid 2-methoxy-4-ethylphenyl ester, 4-chlorobenzoic acid 2-methoxy-4-ethylphenyl ester, 2,4,6-trimethylbenzoic acid 2-methoxy-4-ethylphenyl ester, 1-naphthoic acid 2-methoxy-4-ethylphenyl ester, 2 2-Methoxy-4-ethylphenyl ester of phenylacetic acid, 2-(2-ethoxyphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(2-methoxyphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(2-ethylphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(2-methylphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(2-chlorophenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(4-ethoxyphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(4-methoxyphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(4-ethylphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(4-methylphenyl)acetic acid 2-methoxy-4-ethylphenyl ester 2-(4-Chlorophenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 3-phenylpropionic acid 2-methoxy-4-ethylphenyl ester, 3-(2-ethoxyphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(2-methoxyphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(2-ethylphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(2-methylphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(2-chlorophenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(4-ethoxyphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(4-methoxyphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(4-ethylphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(4-ethylphenyl)propionic acid 2-methoxy-4-ethylphenyl ester2-Methoxy-4-ethylphenyl 3-(4-methylphenyl)propionic acid, 2-Methoxy-4-ethylphenyl 3-(4-chlorophenyl)propionic acid, 2-Methoxy-4-ethylphenyl cyclohexanecarboxylate, 2-Ethoxy-4-ethylphenyl acetate, 2-Ethoxy-4-ethylphenyl propionate, 2-Ethoxy-4-ethylphenyl butyrate, 2-Ethoxy-4-ethylphenyl isobutyrate, 2-Ethoxy-4-ethylphenyl benzoate, 2-Ethoxy-4-ethylphenyl 2-ethoxybenzoate, 2-Methoxybenzoate, 2-Ethoxy-4-ethylphenyl 2-ethylbenzoate, 2-Ethoxy-4-ethylphenyl 2-methylbenzoate, 2-Chlorobenzoate 4-Ethylphenyl ester, 2-ethoxy-4-ethylphenyl ester of 4-ethoxybenzoic acid, 2-ethoxy-4-ethylphenyl ester of 4-methoxybenzoic acid, 2-ethoxy-4-ethylphenyl ester of 4-ethylbenzoic acid, 2-ethoxy-4-ethylphenyl ester of 4-methylbenzoic acid, 2-ethoxy-4-ethylphenyl ester of 4-chlorobenzoic acid, 2-ethoxy-4-ethylphenyl ester of 2-4,6-trimethylbenzoic acid, 2-ethoxy-4-ethylphenyl ester of 1-naphthoic acid, 2-ethoxy-4-ethylphenyl ester of 2-phenylacetic acid, 2-ethoxy-4-ethylphenyl ester of 2-(2-ethoxyphenyl)acetic acid, 2-ethoxy-4-ethylphenyl ester of 2-(2-methoxyphenyl)acetic acid, 2-(2-ethylphenyl)acetic acid... Ethoxy-4-ethylphenyl ester, 2-(2-methylphenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(2-chlorophenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(4-ethoxyphenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(4-methoxyphenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(4-ethylphenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(4-methylphenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(4-chlorophenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 3-phenylpropionic acid 2-ethoxy-4-ethylphenyl ester, 3-(2-ethoxyphenyl)propionic acid 2-ethoxy-4-ethylphenyl ester, 3-(2-methyl ...methylphenyl)propionic acid 2-ethoxy-4-ethylphenyl ester, 3-methylphenyl)propionic acid 2-ethoxy-4-ethylphenyl ester, 3-methylphenyl)propionic 2-Ethoxy-4-ethylphenyl 3-(2-ethylphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(2-methylphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(2-chlorophenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(4-ethoxyphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(4-methoxyphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(4-ethylphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(4-methylphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(4-chlorophenyl)propionate, 2-ethoxy-4-ethylphenyl cyclohexanecarboxylate.

[0015] The method for preparing the ether ester compound in this invention includes:

[0016] The para-substituted or unsubstituted o-alkoxyphenol shown in Formula N is esterified with the acyl halide shown in Formula S in a solvent under the action of an acid-binding agent to obtain an ether ester compound as shown in Formula M.

[0017] In formula S, X is a halogen.

[0018] As an example, the ether ester compounds according to the present invention can be obtained by the following preparation method:

[0019] An esterification reaction is carried out between para-substituted or unsubstituted o-alkoxyphenol (formula N) and acyl chloride (formula S) in a solvent (such as THF) under the action of an acid-binding agent (such as Et3N) to obtain an ether ester compound as shown in formula M:

[0020]

[0021] According to the present invention, X is a halogen, preferably X is Cl.

[0022] In this invention, the acid-binding agent includes, but is not limited to, triethylamine.

[0023] According to the present invention, the molar ratio of the acid-binding agent to the o-alkoxyphenol can be selected within a wide range. In a preferred embodiment of the present invention, the molar ratio of the acid-binding agent to the o-alkoxyphenol is (1.3-1.7):1.

[0024] According to the present invention, the solvent includes, but is not limited to, tetrahydrofuran.

[0025] According to the present invention, the amount of solvent can be selected within a wide range. In a preferred embodiment of the present invention, the amount of solvent is 1-5 ml relative to 1 mmol of o-alkoxyphenol.

[0026] According to the present invention, the molar ratio of the o-alkoxyphenol to the acyl halide can be selected within a wide range. In a preferred embodiment of the present invention, the molar ratio of the o-alkoxyphenol to the acyl halide is 1:(0.8-1.2).

[0027] In a preferred embodiment of the present invention, the esterification reaction conditions include: reacting at a temperature of 15-80°C (preferably the reflux temperature of the solvent) for 7-24 hours under a protective atmosphere; preferably, the preparation method includes:

[0028] Under a protective atmosphere (e.g., nitrogen and / or inert gas), the o-alkoxyphenol, the acid-binding agent, and the solvent are mixed, and a solution containing the acyl halide is added dropwise at 10-20°C, followed by reflux reaction at the solvent's reflux temperature for 7-24 hours.

[0029] According to a preferred embodiment of the present invention, based on a total weight of 100 wt% of the solid catalyst components, the content of the compound represented by general formula (I) is 3 to 25 wt%, for example, 3 wt%, 5 wt%, 8 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%, and any two values ​​or any range of any two values; the content of titanium is 1 to 8 wt%, for example, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, and any two values ​​or any range of any two values; and the content of magnesium is 8 to 30 wt%, for example, 8 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%, 30 wt%, and any two values ​​or any range of any two values.

[0030] More preferably, based on the total weight of the solid catalyst components as 100 wt%, the content of the compound represented by general formula (I) is 5-25 wt%, the content of titanium is 1-6 wt%, and the content of magnesium is 10-25 wt%.

[0031] According to the present invention, preferably, the solid catalyst component comprises a titanium compound, a magnesium compound, and a reaction product selected from compounds represented by general formula (I).

[0032] Preferably, the magnesium compound is selected from magnesium dihalides, magnesium alkoxy compounds, alkyl magnesium compounds, hydrates or alcohols of magnesium dihalides, and derivatives of magnesium dihalides in which one halogen atom in the molecular formula is replaced by a hydrocarbon or halohydroxyl group, preferably magnesium dihalides or their alcohols. Specific examples include magnesium dichloride, magnesium dibromide, magnesium diiodide, and their alcohols.

[0033] Preferably, the titanium compound is of the general formula TiX. m (OR1) 4-m Compounds, where R1 is C1 to C2. 20 The hydrocarbon group, where X is a halogen, 1≤m≤4, preferably m is an integer. Examples include: titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tetrabutoxy, titanium tetraethoxy, titanium monochlorotriethoxy, titanium dichlorodiethoxy, titanium trichloromonoethoxy, with titanium tetrachloride being the preferred one.

[0034] The solid catalyst component in this invention can be prepared, for example, by the following method: first, a magnesium compound is dissolved in a solvent system comprising an organic epoxy compound, an organic phosphorus compound, and an inert diluent to form a homogeneous solution, which is then mixed with a titanium compound, and a solid is precipitated in the presence of a precipitation aid; this solid is treated with a compound selected from general formula (I) to attach it to the solid, and if necessary, the solid is further treated with titanium tetrahalide and an inert diluent.

[0035] The magnesium compounds, titanium compounds, and compounds of general formula (I) are as described above. The organic epoxy compounds, organophosphorus compounds, and precipitation aids are disclosed in Chinese Patent CN85100997, the contents of which are incorporated herein by reference. For example, organic epoxy compounds may be selected from oxides, glycidyl ethers, and internal ethers of aliphatic olefins, dienes, or halogenated aliphatic olefins or dienes having 2 to 8 carbon atoms. Specific compounds include: ethylene oxide, propylene oxide, butane oxide, butadiene oxide, butadiene dioxide, epichlorohydrin, methyl glycidyl ether, diglycidyl ether, and tetrahydrofuran. Organophosphorus compounds may include hydrocarbon esters or halogenated hydrocarbon esters of orthophosphoric acid or phosphorous acid, specifically: trimethyl orthophosphate, triethyl orthophosphate, tributyl orthophosphate, triphenyl orthophosphate, trimethyl orthophosphate, triethyl orthophosphate, tributyl orthophosphate, and triphenyl methyl orthophosphate. The precipitation aids may be selected from organic anhydrides, organic acids, ethers, ketones, and esters. Specifically, these 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, malonate, glutarate, 2,4-pentanediol ester, and 3,5-heptanediol ester.

[0036] Preferably, the amount of each component, per mole of magnesium compound (i.e., relative to each mole of magnesium compound), is 0.2 to 10 moles of organic epoxy compound, 0.1 to 3 moles of organic phosphorus compound, 0 to 1.0 moles of precipitation aid, 0.5 to 150 moles of titanium compound, and 0.01 to 1.0 moles of the compound represented by general formula (I).

[0037] The solid catalyst component described in this invention can also be prepared by other methods, specifically including the methods listed below.

[0038] Method 1: The catalyst component is prepared according to the method disclosed in patent CN1506384. First, a magnesium compound and an organic alcohol compound are mixed with an inert solvent at a molar ratio of 2-5, and the mixture is heated to 120-150°C and reacted for 1-5 hours at a magnesium / anhydride molar ratio of 5-10. Then, the alcohol compound cooled to room temperature is 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 is heated to 90-110°C. A compound selected from general formula (I) is added at a magnesium / internal electron donor molar ratio of 2-10, and the mixture is reacted at 100-130°C for 1-3 hours. The solid particles are then separated by filtration. Next, the solid particles are 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 are then separated by filtration. Finally, the solid particles are washed with an inert solvent at 50-80°C and dried to obtain the catalyst component.

[0039] Method 2: A solid catalyst component is prepared by reacting the titanium compound of the present invention, specifically TiCl4, with an adduct of the general formula MgCl2·pROH. In MgCl2·pROH, p is a number from 0.1 to 6, preferably from 2 to 3.5, and R is a hydrocarbon group having 1 to 18 carbon atoms. The adduct can be suitably prepared into spherical form by mixing an alcohol (ROH) and MgCl2 in the presence of an inert hydrocarbon immiscible with the adduct, and then rapidly cooling the emulsion to solidify the adduct into spherical particles. The adduct thus obtained can react directly with the titanium compound, or it can be pre-treated with a thermally controlled dealcoholization process (80–130 °C) before reacting with the titanium compound to obtain an adduct, wherein the molar number of the alcohol is generally less than 3, preferably between 0.1 and 2.7. The reaction with the titanium compound can be carried out by suspending the adduct (de-alcoholized or the adduct itself) in cold TiCl4 (generally 0°C) and then heating the mixture to 80–130°C and maintaining it at this temperature for 0.1–2 hours. The TiCl4 treatment can be performed once or multiple times. During the TiCl4 treatment, the compound of general formula (I) of the present invention described above can be added, and this treatment can also be repeated once or multiple times.

[0040] Method 3: The catalyst component is prepared according to the method disclosed in patent CN1091748. The magnesium chloride alcohol 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 and rapidly cooled and solidified to form magnesium chloride alcohol 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 alcohol microspheres are washed and dried to form a spherical carrier. The molar ratio of alcohol to magnesium chloride is 2–3, preferably 2–2.5. The carrier particle size is 10–300 micrometers, preferably 30–150 micrometers.

[0041] The above-mentioned spherical support was treated with an excess of titanium tetrachloride at low temperature, and the temperature was gradually increased. During the treatment, an electron donor of general formula (I) of this invention was added. After treatment, the sample was washed multiple times with an inert solvent and dried to obtain a solid powdered spherical catalyst component. The molar ratio of titanium tetrachloride to magnesium chloride was 20–200, preferably 30–60; the initial treatment temperature was -30–0℃, preferably -25–-20℃; and the final treatment temperature was 80–136℃, preferably 100–130℃.

[0042] Method 4: Alternatively, magnesium dialkoxy can be 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 of general formula (I) of this invention is added at -20 to 130°C to react with the reaction. The resulting solid is washed with an 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 the solid catalyst component. The amount of tetravalent titanium chloride used per mole of dialkyl magnesium is 0.5 to 100 mol, and the amount of electron donor is 0.01 to 10 mol.

[0043] Method 5: Halogenating 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 a compound of general formula (I) of the present invention is added during one or more such treatments.

[0044] Method Six: The catalyst component is prepared according to the method disclosed in patent US4540679. First, magnesium alkoxide and carbon dioxide are reacted to obtain a hydrocarbon-based magnesium carbonate support. Then, a transition metal compound (preferably a tetravalent titanium compound) and the hydrocarbon-based magnesium carbonate support are reacted with the electron donor of general formula (I) of the present invention in a certain proportion 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 electron donor of general formula (I) of the present invention is at most 1.0 mol per gram of titanium atoms. The inert solvent must be purified to remove substances that easily poison the catalyst, such as water, oxygen, and carbon dioxide. The reaction is carried out at -10 to 170°C for a period of several minutes to several hours.

[0045] Another method for preparing solid catalyst components is to form an emulsion of magnesium compounds, electron donors, etc. in a diluent, add titanium compounds to fix it to obtain spherical solids, and then process it to obtain solid catalyst components.

[0046] In any of the above preparation methods, the desired electron donor compound (I) can be added either in the form of a compound or in other ways, such as by obtaining it in situ using a suitable precursor of the electron donor compound (I), which can be converted into the desired electron donor compound through, for example, a known chemical reaction such as esterification.

[0047] A second aspect of the present invention is to provide a catalyst for olefin polymerization comprising a reaction product containing the following components:

[0048] a) The solid catalyst components described in the first aspect;

[0049] b) Alkyl aluminum compounds, with the general formula AlR n X 3-nIn the formula, R is hydrogen or C1~C 20 The hydrocarbon group, where X is a halogen, 1≤n≤3; preferably n is an integer.

[0050] Specific examples of the alkylaluminum compounds in the above catalysts include triethylaluminum, tripropylaluminum, tri-n-butylaluminum, triisobutylaluminum, tri-n-octylaluminum, triisobutylaluminum, diethylaluminum monohydrogen, diisobutylaluminum monohydrogen, diethylaluminum monochloro, diisobutylaluminum monochloro, sesquiethylaluminum chloride, and dichloroethylaluminum, with triethylaluminum and triisobutylaluminum being preferred.

[0051] For applications requiring highly stereoregular olefin polymers, an external electron donor component (c) needs to be added to the catalyst. The external electron donor component (c) is selected from the general formula R. 2’ k Si(OR 3’ ) 4-k Compounds, where 0 ≤ k ≤ 3, preferably k is an integer, R 3’ Selected from alkyl, cycloalkyl, aryl, and haloalkyl groups, R 2’ Selected from alkyl, cycloalkyl, aryl, haloalkyl, amino, substituted amino, halogen, and hydrogen atoms. Examples include: trimethylmethoxysilane, trimethylethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, phenyltriethoxysilane, phenyltrimethoxysilane, vinyltrimethoxysilane, cyclohexylmethyldimethoxysilane, and methyl tert-butyldimethoxysilane, preferably cyclohexylmethyldimethoxysilane and diphenyldimethoxysilane.

[0052] According to a preferred embodiment of the present invention, the molar ratio of component a) to component b) is 1:(5-5000) in terms of titanium:aluminum, preferably 1:(20-500); and / or,

[0053] The molar ratio of component a) to component c) is 1:(0-500) in terms of titanium:silicon, preferably 1:(3-100).

[0054] A third aspect of the present invention is to provide a prepolymerization catalyst for olefin polymerization, the prepolymerization catalyst comprising a prepolymer obtained by prepolymerization of the catalyst described in the second aspect with an olefin, wherein the prepolymerization ratio is 0.1 to 1000 based on the mass ratio of the olefin polymer to the solid catalyst component, that is, the prepolymerization catalyst comprises the prepolymer obtained by prepolymerization of the above-mentioned catalyst with an olefin, wherein the prepolymerization ratio is 0.1 to 1000 g olefin polymer / g solid catalyst component.

[0055] In this invention, "prepolymerization catalyst" refers to a catalyst that undergoes a polymerization step with a low degree of conversion. According to the invention, prepolymerization can be carried out using the same α-olefin as the olefin used in the polymerization, wherein the olefin used for prepolymerization is preferably ethylene or propylene. Specifically, it is particularly preferred to use ethylene or a mixture thereof with one or more α-olefins in an amount of up to 20 mol%. Preferably, the degree of conversion of the prepolymerization catalyst component is about 0.2 to 500 g polymer / g solid catalyst component.

[0056] The prepolymerization process can be carried out in a liquid or gas phase at temperatures ranging from -20 to 80°C, preferably from 0 to 50°C. The prepolymerization step can be performed online as part of a continuous polymerization process or independently in a batch operation. For preparing polymers with a catalyst component concentration of 0.5 to 20 g / g, batch prepolymerization of the catalyst of the present invention with ethylene is particularly preferred. The polymerization pressure is 0.01 to 10 MPa.

[0057] Preferably, the olefin used in the prepolymerization is ethylene or propylene.

[0058] A fourth aspect of the present invention is to provide a method for olefin polymerization, wherein the olefin is polymerized under the action of the catalyst described in the second aspect or the prepolymerization catalyst described in the third aspect.

[0059] The catalyst of the present invention can be directly added to the reactor for use in the polymerization process, or the catalyst can be prepolymerized with olefins to obtain a prepolymerized catalyst and then added to the reactor.

[0060] The olefin polymerization reaction of the present invention is carried out according to known polymerization methods, which can be carried out in the liquid phase or gas phase, or in a combination of liquid phase and gas phase polymerization stages. Conventional techniques such as slurry polymerization and gas-phase fluidized bed polymerization are employed. Preferably, the following reaction conditions are used: polymerization temperature 0–150°C, preferably 60–90°C. In one specific embodiment, the polymerization is slurry polymerization.

[0061] The olefins described in this invention have the general formula CH2=CHR, where R is hydrogen or C1~C1. 12 Alkyl or aryl groups. Such as those selected from ethylene, propylene, 1-butene, 4-methyl-1-pentene, and 1-hexene. Preferably selected from ethylene or propylene. Such as homopolymerization of propylene and / or copolymerization of propylene with other olefins.

[0062] The method of the present invention is also applicable to homopolymerization of ethylene and copolymerization of ethylene with α-olefins such as propylene, butene, pentene, hexene, octene, and 4-methyl-1-pentene.

[0063] Through the above technical solution, this invention provides a novel solid catalyst component and a catalyst and prepolymerization catalyst prepared using the aforementioned solid catalyst component by employing an ether ester compound as an internal electron donor. These catalysts exhibit excellent overall performance, demonstrating high activity in olefin polymerization, particularly propylene polymerization, and producing polymers with high isotacticity, showing promising application prospects. The preparation method of the ether ester compound is simple, the reaction conditions are mild, the operation is simple and safe, and the raw materials are inexpensive and readily available. Detailed Implementation

[0064] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the content of the present invention are still within the scope of protection of the present invention.

[0065] The present invention will be further described below with reference to specific embodiments, but this does not constitute any limitation on the present invention.

[0066] Test methods

[0067] Nuclear magnetic resonance (NMR) measurements: Measured using a Bruke DMX300 NMR spectrometer. 1 H-NMR (300MHz, solvent CDCl3, TMS as internal standard, measurement temperature 300K).

[0068] Polymer isotactic index: determined by heptane extraction method (boiling heptane extraction for 6 hours): 2 g of dry 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) obtained to 2 is the isotactic index.

[0069] I. Synthesis of Compounds

[0070] Preparation of Compound (1) in Example 1

[0071] The synthesized ether ester compound (1) has the following structure:

[0072]

[0073] Under nitrogen protection, 20 mmol of 2-methoxyphenol, 30 mmol of triethylamine, and 20 ml of tetrahydrofuran (THF) were added to a 250 ml three-necked flask and stirred. The mixture was cooled to 10 °C in an ice bath, and 10 ml of 20 mmol of acetyl chloride in THF solution was added dropwise at 10-20 °C. After the addition was complete, the ice bath was removed, and the mixture was allowed to warm naturally to room temperature. The mixture was then heated to the reflux temperature of THF and refluxed for 7-24 hours, with the reaction monitored by TLC. After the reaction was complete, the mixture was cooled to room temperature. The mixture was washed with 30 ml of water, separated, and the aqueous phase was extracted twice with 25 ml of diethyl ether. The organic phases were combined. The mixture was washed with 30 ml of 1N HCl, then with 50 ml of saturated NaHCO3 solution, and then with 50 ml of water. The organic phase was dried over 10 g of anhydrous Na2SO4, concentrated under vacuum to remove the solvent, and purified by column chromatography to obtain the target ether ester compound (1).

[0074] use 1 The structure of the synthesized ether ester compound (1) was confirmed by 1H NMR.

[0075] 1 ¹H NMR (300MHz, CDCl₃, TMS as internal standard, δ / ppm): 6.91-7.22 (m, 4H), 3.82 (s, 3H), 2.31 (s, 3H).

[0076] Preparation of compounds (2) to (11) in Examples 2-11

[0077] Following a similar synthetic method to that of compound (1) above, different para-substituted or unsubstituted o-alkoxyphenols (II) and different acyl chlorides (RCOCl) were used as raw materials for esterification reactions to synthesize a series of ether ester compounds (2) to (11) with general formula (I). And using... 1 ¹H NMR confirmed the structure of the synthesized compound. The para-substituted or unsubstituted o-alkoxyphenol (II) and acyl chloride (RCOCl), as well as R in the product structural formula (I), were also present. 1 R 2 See Table 1 for R.

[0078]

[0079] Table 1 Ethers and Esters

[0080]

[0081]

[0082] II. Preparation and Application of Solid Catalyst Components

[0083] Example 1

[0084] In a reactor fully purged with high-purity nitrogen, 4.8 g of magnesium chloride, 95 mL of toluene, 4 mL of epichlorohydrin, and 12.5 mL of tributyl phosphate were added sequentially. The mixture was heated to 50 °C with stirring and maintained for 2.5 h until the solid completely dissolved. Then, 1.4 g of phthalic anhydride was added and the mixture was maintained for another 1 h. The solution was cooled to below -25 °C, and 56 mL of TiCl4 was added dropwise over 1 h. The temperature was slowly raised to 80 °C, and a solid gradually precipitated during the heating process. 6 mmol of the compound (1) prepared above was added as an internal electron donor, and the temperature was maintained for 1 h. After filtration, the solid precipitate was washed twice with 70 mL of toluene to obtain a solid precipitate. Then, 60 mL of toluene and 40 mL of TiCl4 were added, and the temperature was raised to 110 °C and maintained for 2 h. After the filtrate was drained, the same operation was repeated once. The solid precipitate was then washed three times with 70 mL of toluene at 110 °C for 10 min each time. Finally, 60 mL of hexane was added, and the solid catalyst component (containing 3 wt% Ti) was obtained.

[0085] A dry 250 mL three-necked flask was fully purged with nitrogen and propylene, respectively. 100 mL of heptane was added, and the mixture was heated to 70 °C. Then, 2.0 mmol of AlEt3 and 0.1 mmol of methylcyclohexyldimethoxysilane (CHMMS) were added under normal pressure to ensure an Al / Si ratio of 20 mol. At this temperature, 10 mg of the prepared solid catalyst was added, and the reaction was allowed to proceed for 2 hours. The reaction was then terminated with ethanol. The polymer was washed with anhydrous ethanol and dried under vacuum to obtain the final polymer. Experimental data are shown in Table 2.

[0086] Example 2

[0087] Same as Example 1, except that the added internal electron donor is compound (2). Data are shown in Table 2.

[0088] Example 3

[0089] Same as Example 1, except that the added internal electron donor is compound (3). Data are shown in Table 2.

[0090] Example 4

[0091] Same as Example 1, except that the added internal electron donor is compound (4). Data are shown in Table 2.

[0092] Example 5

[0093] Same as Example 1, except that the added internal electron donor is compound (5). Data are shown in Table 2.

[0094] Example 6

[0095] Same as Example 1, except that the added internal electron donor is compound (6). Data are shown in Table 2.

[0096] Example 7

[0097] Same as Example 1, except that the added internal electron donor is compound (7). Data are shown in Table 2.

[0098] Example 8

[0099] Same as Example 1, except that the added internal electron donor is compound (8). Data are shown in Table 2.

[0100] Example 9

[0101] Same as Example 1, except that the added internal electron donor is compound (9). Data are shown in Table 2.

[0102] Example 10

[0103] Same as Example 1, except that the added internal electron donor is compound (10). Data are shown in Table 2.

[0104] Example 11

[0105] Same as Example 1, except that the added internal electron donor is compound (11). Data are shown in Table 2.

[0106] Table 2 Results of propylene polymerization catalyzed by catalysts

[0107]

[0108] As can be seen from Table 2, the solid catalyst components and catalysts prepared using the ether ester compounds of the present invention as electron donors exhibit good activity and high polymer isotacticity when used for olefin polymerization.

[0109] 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.

[0110] All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those skilled in the art. In case of conflict, the definitions in this specification shall prevail.

[0111] When this specification uses the prefixes “known to those skilled in the art,” “prior art,” or similar terms to derive materials, substances, methods, steps, apparatus, or components, the objects derived from such prefixes cover those commonly used in the art at the time of this application, but also include those that are not currently commonly used but will become generally recognized in the art as suitable for similar purposes.

[0112] The endpoints and any values ​​of the ranges disclosed in this application are not limited to the precise ranges or values; such ranges or values ​​should be understood to include values ​​close to them. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein. In principle, various technical solutions can be combined with each other to obtain new technical solutions, which should also be considered as specifically disclosed herein.

[0113] In the context of this specification, except where expressly stated otherwise, any matters or issues not mentioned shall apply directly to those known in the art without any modification.

[0114] Furthermore, any implementation described herein can be freely combined with one or more other implementations described herein, and the resulting technical solutions or technical ideas shall be regarded as part of the original disclosure or original record of the present invention, and should not be regarded as new content not disclosed or anticipated herein, unless those skilled in the art consider the combination to be obviously unreasonable.

Claims

1. A solid catalyst component comprising titanium, magnesium, a halogen, and an electron-donating compound, said electron-donating compound being selected from at least one of compounds of general formula (I): Equation (I); In formula (I), in the compound represented by general formula (I), R 1 Selected from hydrogen or C1-C6 alkyl groups, R 2 R is selected from C1-C6 alkyl groups, with or without substituents, and is a C6-C6 alkyl group. 20 aryl, with or without substituents, C7-C 20 Aryl groups, with or without substituents, C5-C 20 Cycloalkyl.

2. The solid catalyst component according to claim 1, characterized in that, In the compound represented by general formula (Ⅰ), R 1 It is hydrogen or a C1-C4 alkyl group; and / or, R 2 It is a C1-C4 alkyl group; and / or, R is a C1-C4 alkyl group, or a C6-C group with or without substituents. 10 aryl, with or without substituents, C7-C 10 Aryl groups, with or without substituents, C5-C 10 Cycloalkyl.

3. The solid catalyst component according to claim 1, characterized in that, In the compound represented by general formula (Ⅰ), R 1 It is hydrogen, methyl, or ethyl; and / or, R 2 Methyl or ethyl; and / or, R is a C1-C3 alkyl group, a phenyl group with or without substituents, a naphthyl group with or without substituents, a benzyl group with or without substituents, a phenethyl group with or without substituents, or a cyclohexyl group with or without substituents.

4. The solid catalyst component according to claim 1, characterized in that, The substituent is selected from C1-C1. 18 Alkyl, C1-C 18 Alkyl groups and halogens.

5. The solid catalyst component according to claim 1, characterized in that, The substituents are C1-C6 alkyl groups, C1-C6 alkoxy groups, or halogens.

6. The solid catalyst component according to claim 1, characterized in that, The substituents are C1-C4 alkyl, C1-C4 alkoxy, chlorine, or bromine.

7. The solid catalyst component according to claim 1, characterized in that, The substituents are methyl, ethyl, methoxy, ethoxy, and chlorine.

8. The solid catalyst component according to claim 1, characterized in that, The electron-donating compound is selected from at least one of the following compounds: 2-methoxyphenyl acetate, 2-methoxyphenyl propionate, 2-methoxyphenyl butyrate, 2-methoxyphenyl isobutyrate, 2-methoxyphenyl benzoate, 2-ethoxybenzoate, 2-methoxyphenyl benzoate, 2-ethylbenzoate, 2-methylbenzoate, 2-chlorobenzoate, 2-ethoxyphenyl benzoate, 4-methoxyphenyl benzoate, 4-methoxyphenyl benzoate, 4-ethylbenzoate, 4-methylbenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate. 2-Methoxyphenyl Naphthoic acid, 2-Phenylacetic acid 2-Methoxyphenyl ester, 2-(2-ethoxyphenyl)acetic acid 2-Methoxyphenyl ester, 2-(2-methoxyphenyl)acetic acid 2-Methoxyphenyl ester, 2-(2-ethylphenyl)acetic acid 2-Methoxyphenyl ester, 2-(2-methylphenyl)acetic acid 2-Methoxyphenyl ester, 2-(2-chlorophenyl)acetic acid 2-Methoxyphenyl ester, 2-(4-ethoxyphenyl)acetic acid 2-Methoxyphenyl ester, 2-(4-methoxyphenyl)acetic acid 2-Methoxyphenyl ester, 2-(4-ethylphenyl)acetic acid 2-Methoxyphenyl ester, 2-(4-methylphenyl)acetic acid 2-Methoxyphenyl ester, 2-(4-chlorophenyl)acetic acid 2-Methoxyphenyl ester, 3-Phenylacetic acid 2-Methoxyphenyl ester, 3-(2-ethoxyphenyl) 2-Methoxyphenyl propionate, 3-(2-methoxyphenyl)propionate, 2-methoxyphenyl 3-(2-ethylphenyl)propionate, 2-methoxyphenyl 3-(2-methylphenyl)propionate, 2-methoxyphenyl 3-(2-chlorophenyl)propionate, 2-methoxyphenyl 3-(4-ethoxyphenyl)propionate, 2-methoxyphenyl 3-(4-methoxyphenyl)propionate, 2-methoxyphenyl 3-(4-ethylphenyl)propionate, 2-methoxyphenyl 3-(4-methylphenyl)propionate, 2-methoxyphenyl 3-(4-chlorophenyl)propionate, 2-methoxyphenyl cyclohexanecarboxylate, 2-ethoxyphenyl acetate, 2-ethoxyphenyl propionate, 2-ethoxyphenyl butyrate, 2-ethoxyphenyl isobutyrate, benzoyl... 2-Ethoxyphenyl ester, 2-Ethoxybenzoic acid 2-ethoxyphenyl ester, 2-Methoxybenzoic acid 2-ethoxyphenyl ester, 2-Ethoxyphenyl ester 2-Ethylbenzoic acid, 2-Methylbenzoic acid 2-ethoxyphenyl ester, 2-Chlorobenzoic acid 2-ethoxyphenyl ester, 4-Ethoxybenzoic acid 2-ethoxyphenyl ester, 4-Methoxybenzoic acid 2-ethoxyphenyl ester, 4-Ethylbenzoic acid 2-ethoxyphenyl ester, 4-Methylbenzoic acid 2-ethoxyphenyl ester, 4-Chlorobenzoic acid 2-ethoxyphenyl ester, 2,4,6-Trimethylbenzoic acid 2-ethoxyphenyl ester, 1-Naphthoic acid 2-ethoxyphenyl ester, 2-Phenylacetic acid 2-ethoxyphenyl ester, 2-(2-Ethoxyphenyl)acetic acid 2-ethoxyphenyl ester, 2-(2-Methoxyphenyl)acetic acid 2-ethoxyphenyl ester2-(2-Ethylphenyl)acetic acid 2-ethoxyphenyl ester, 2-(2-Methylphenyl)acetic acid 2-ethoxyphenyl ester, 2-(2-Chlorophenyl)acetic acid 2-ethoxyphenyl ester, 2-(4-Ethoxyphenyl)acetic acid 2-ethoxyphenyl ester, 2-(4-Methoxyphenyl)acetic acid 2-ethoxyphenyl ester, 2-(4-Ethylphenyl)acetic acid 2-ethoxyphenyl ester, 2-(4-Methylphenyl)acetic acid 2-ethoxyphenyl ester, 2-(4-Chlorophenyl)acetic acid 2-ethoxyphenyl ester, 3-Phenylacetic acid 2-ethoxyphenyl ester, 3-(2-Ethoxyphenyl)propionic acid 2-ethoxyphenyl ester, 3-(2-Methoxyphenyl)propionic acid 2-ethoxyphenyl ester, 3-(2-Ethylphenyl)propionic acid 2-ethoxyphenyl ester, 3-(2-Methylphenyl)propionic acid 2- Ethoxyphenyl ester, 2-ethoxyphenyl 3-(2-chlorophenyl)propionic acid, 2-ethoxyphenyl 3-(4-ethoxyphenyl)propionic acid, 2-ethoxyphenyl 3-(4-methoxyphenyl)propionic acid, 2-ethoxyphenyl 3-(4-ethylphenyl)propionic acid, 2-ethoxyphenyl 3-(4-methylphenyl)propionic acid, 2-ethoxyphenyl 3-(4-chlorophenyl)propionic acid, 2-ethoxyphenyl cyclohexanecarboxylic acid, 2-methoxy-4-methylphenyl acetate, 2-methoxy-4-methylphenyl propionate, 2-methoxy-4-methylphenyl butyrate, 2-methoxy-4-methylphenyl isobutyrate, 2-methoxy-4-methylphenyl benzoate, 2-methoxy-4-methylphenyl 2-ethoxybenzoic acid, 2-methoxybenzoic acid 4-Methylphenyl ester, 2-ethylbenzoic acid 2-methoxy-4-methylphenyl ester, 2-methylbenzoic acid 2-methoxy-4-methylphenyl ester, 2-chlorobenzoic acid 2-methoxy-4-methylphenyl ester, 4-ethoxybenzoic acid 2-methoxy-4-methylphenyl ester, 4-methoxybenzoic acid 2-methoxy-4-methylphenyl ester, 4-ethylbenzoic acid 2-methoxy-4-methylphenyl ester, 4-methylbenzoic acid 2-methoxy-4-methylphenyl ester, 4-chlorobenzoic acid 2-methoxy-4-methylphenyl ester, 2,4,6-trimethylbenzoic acid 2-methoxy-4-methylphenyl ester, 1-naphthoic acid 2-methoxy-4-methylphenyl ester, 2-phenylacetic acid 2-methoxy-4-methylphenyl ester, 2-(2-ethoxyphenyl)acetic acid 2-methoxy-4- 2-Methylphenyl ester, 2-(2-methoxyphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(2-ethylphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(2-methylphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(2-chlorophenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(4-ethoxyphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(4-methoxyphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(4-ethylphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(4-methylphenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-(4-chlorophenyl)acetic acid 2-methoxy-4-methylphenyl ester, 2-phenylpropionic acid 2-methoxy-4-methylphenyl ester2-Methoxy-4-methylphenyl 3-(2-ethoxyphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(2-methoxyphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(2-ethylphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(2-methylphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(2-chlorophenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(4-ethoxyphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(4-methoxyphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(4-ethylphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(4-methylphenyl)propionic acid, 2-Methoxy-4-methylphenyl 3-(4-chlorophenyl)propionic acid 2-Methylphenyl ester, 2-methoxy-4-methylphenyl ester cyclohexanecarboxylic acid, 2-ethoxy-4-methylphenyl ester acetic acid, 2-ethoxy-4-methylphenyl ester propionic acid, 2-ethoxy-4-methylphenyl ester butyric acid, 2-ethoxy-4-methylphenyl ester isobutyric acid, 2-ethoxy-4-methylphenyl ester benzoic acid, 2-ethoxy-4-methylphenyl ester 2-ethoxybenzoic acid, 2-ethoxy-4-methylphenyl ester 2-ethylbenzoic acid, 2-ethoxy-4-methylphenyl ester 2-methylbenzoic acid, 2-ethoxy-4-methylphenyl ester 2-chlorobenzoic acid, 2-ethoxy-4-methylphenyl ester 4-ethoxybenzoic acid, 2-ethoxy-4-methylphenyl ester 4-methoxybenzoic acid, 4- 2-Ethoxy-4-methylphenyl ethylbenzoate, 2-ethoxy-4-methylphenyl 4-methylbenzoate, 2-ethoxy-4-methylphenyl 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 2-ethoxy-4-methylphenyl 1-naphthoic acid, 2-ethoxy-4-methylphenyl 2-phenylacetic acid, 2-ethoxy-4-methylphenyl 2-(2-ethoxyphenyl)acetic acid, 2-ethoxy-4-methylphenyl 2-(2-methoxyphenyl)acetic acid, 2-ethoxy-4-methylphenyl 2-(2-ethylphenyl)acetic acid, 2-ethoxy-4-methylphenyl 2-(2-methylphenyl)acetic acid, 2-ethoxy-4-methylphenyl 2-(2-chlorophenyl)acetic acid, 2 2-(4-ethoxyphenyl)acetic acid 2-ethoxy-4-methylphenyl ester, 2-(4-methoxyphenyl)acetic acid 2-ethoxy-4-methylphenyl ester, 2-(4-ethylphenyl)acetic acid 2-ethoxy-4-methylphenyl ester, 2-(4-methylphenyl)acetic acid 2-ethoxy-4-methylphenyl ester, 2-(4-chlorophenyl)acetic acid 2-ethoxy-4-methylphenyl ester, 3-phenylpropionic acid 2-ethoxy-4-methylphenyl ester, 3-(2-ethoxyphenyl)propionic acid 2-ethoxy-4-methylphenyl ester, 3-(2-methoxyphenyl)propionic acid 2-ethoxy-4-methylphenyl ester, 3-(2-ethylphenyl)propionic acid 2-ethoxy-4-methylphenyl ester, 3-(2-methylphenyl)propionic acid 2-ethoxy-4-methylphenyl ester2-Ethoxy-4-methylphenyl 3-(2-chlorophenyl)propionic acid, 2-ethoxy-4-methylphenyl 3-(4-ethoxyphenyl)propionic acid, 2-ethoxy-4-methylphenyl 3-(4-methoxyphenyl)propionic acid, 2-ethoxy-4-methylphenyl 3-(4-ethylphenyl)propionic acid, 2-ethoxy-4-methylphenyl 3-(4-methylphenyl)propionic acid, 2-ethoxy-4-methylphenyl 3-(4-chlorophenyl)propionic acid, 2-ethoxy-4-methylphenyl cyclohexanecarboxylate, 2-methoxy-4-ethylphenyl acetate, 2-methoxy-4-ethylphenyl propionate, 2-methoxy-4-ethylphenyl butyrate, 2-methoxy-4-ethylphenyl isobutyrate, 2-methoxy-4-ethylphenyl benzoate 2-Ethoxybenzoic acid 2-methoxy-4-ethylphenyl ester, 2-methoxybenzoic acid 2-methoxy-4-ethylphenyl ester, 2-ethylbenzoic acid 2-methoxy-4-ethylphenyl ester, 2-methylbenzoic acid 2-methoxy-4-ethylphenyl ester, 2-chlorobenzoic acid 2-methoxy-4-ethylphenyl ester, 4-ethoxybenzoic acid 2-methoxy-4-ethylphenyl ester, 4-methoxybenzoic acid 2-methoxy-4-ethylphenyl ester, 4-ethylbenzoic acid 2-methoxy-4-ethylphenyl ester, 4-methylbenzoic acid 2-methoxy-4-ethylphenyl ester, 4-chlorobenzoic acid 2-methoxy-4-ethylphenyl ester, 2,4,6-trimethylbenzoic acid 2-methoxy-4-ethylphenyl ester, 1-naphthoic acid 2-methoxy-4-ethylphenyl ester, 2 2-Methoxy-4-ethylphenyl ester of phenylacetic acid, 2-(2-ethoxyphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(2-methoxyphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(2-ethylphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(2-methylphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(2-chlorophenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(4-ethoxyphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(4-methoxyphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(4-ethylphenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 2-(4-methylphenyl)acetic acid 2-methoxy-4-ethylphenyl ester 2-(4-chlorophenyl)acetic acid 2-methoxy-4-ethylphenyl ester, 3-phenylpropionic acid 2-methoxy-4-ethylphenyl ester, 3-(2-ethoxyphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(2-methoxyphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(2-ethylphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(2-methylphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(2-chlorophenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(4-ethoxyphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(4-methoxyphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(4-ethylphenyl)propionic acid 2-methoxy-4-ethylphenyl ester, 3-(4-ethylphenyl)propionic acid 2-methoxy-4-ethylphenyl ester2-Methoxy-4-ethylphenyl 3-(4-methylphenyl)propionic acid, 2-Methoxy-4-ethylphenyl 3-(4-chlorophenyl)propionic acid, 2-Methoxy-4-ethylphenyl cyclohexanecarboxylate, 2-Ethoxy-4-ethylphenyl acetate, 2-Ethoxy-4-ethylphenyl propionate, 2-Ethoxy-4-ethylphenyl butyrate, 2-Ethoxy-4-ethylphenyl isobutyrate, 2-Ethoxy-4-ethylphenyl benzoate, 2-Ethoxy-4-ethylphenyl 2-ethoxybenzoate, 2-Methoxybenzoate, 2-Ethoxy-4-ethylphenyl 2-ethylbenzoate, 2-Ethoxy-4-ethylphenyl 2-methylbenzoate, 2-Chlorobenzoate 4-Ethylphenyl ester, 2-ethoxy-4-ethylphenyl ester of 4-ethoxybenzoic acid, 2-ethoxy-4-ethylphenyl ester of 4-methoxybenzoic acid, 2-ethoxy-4-ethylphenyl ester of 4-ethylbenzoic acid, 2-ethoxy-4-ethylphenyl ester of 4-methylbenzoic acid, 2-ethoxy-4-ethylphenyl ester of 4-chlorobenzoic acid, 2-ethoxy-4-ethylphenyl ester of 2,4,6-trimethylbenzoic acid, 2-ethoxy-4-ethylphenyl ester of 1-naphthoic acid, 2-ethoxy-4-ethylphenyl ester of 2-phenylacetic acid, 2-ethoxy-4-ethylphenyl ester of 2-(2-ethoxyphenyl)acetic acid, 2-ethoxy-4-ethylphenyl ester of 2-(2-methoxyphenyl)acetic acid, 2-(2-ethylphenyl)acetic acid... Ethoxy-4-ethylphenyl ester, 2-(2-methylphenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(2-chlorophenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(4-ethoxyphenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(4-methoxyphenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(4-ethylphenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(4-methylphenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 2-(4-chlorophenyl)acetic acid 2-ethoxy-4-ethylphenyl ester, 3-phenylpropionic acid 2-ethoxy-4-ethylphenyl ester, 3-(2-ethoxyphenyl)propionic acid 2-ethoxy-4-ethylphenyl ester, 3-(2-methyl ...methylphenyl)propionic acid 2-ethoxy-4-ethylphenyl ester, 3-methylphenyl)propionic acid 2-ethoxy-4-ethylphenyl ester, 3-methylphenyl)propionic acid 2-ethoxy-4-ethylphenyl ester, 3-methylphenyl)propionic acid 2 2-Ethoxy-4-ethylphenyl 3-(2-ethylphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(2-methylphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(2-chlorophenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(4-ethoxyphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(4-methoxyphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(4-ethylphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(4-methylphenyl)propionate, 2-ethoxy-4-ethylphenyl 3-(4-chlorophenyl)propionate, 2-ethoxy-4-ethylphenyl cyclohexanecarboxylate.

9. The solid catalyst component according to any one of claims 1-8, characterized in that, Based on the total weight of the solid catalyst components as 100wt%, the content of the compound represented by the general formula (Ⅰ) is 3~25wt%, the content of titanium is 1~8wt%, and the content of magnesium is 8~30wt%.

10. The solid catalyst component according to any one of claims 1-8, characterized in that, Based on the total weight of the solid catalyst components being 100wt%, the content of the compound represented by the general formula (Ⅰ) is 5~25wt%, the content of titanium is 1~6wt%, and the content of magnesium is 10~25wt%.

11. The solid catalyst component according to any one of claims 1-8, characterized in that, The solid catalyst component comprises titanium compounds, magnesium compounds, and reaction products selected from compounds represented by general formula (I).

12. The solid catalyst component according to claim 11, characterized in that, The magnesium compound is selected from magnesium dihalides, magnesium alkoxy compounds, alkyl magnesium compounds, hydrates or alcohols of magnesium dihalides, and derivatives of magnesium dihalides in which one halogen atom in the molecular formula is replaced by a hydrocarbon or halohydroxyl group; and / or, The titanium compound has the general formula TiX. m (OR1) 4-m Compounds, where R1 is C1~C 20 The hydrocarbon group, where X is a halogen, and 1 ≤ m ≤ 4.

13. A catalyst for olefin polymerization, comprising a reaction product containing the following components: a) The solid catalyst component according to any one of claims 1 to 12; b) Alkyl aluminum compounds, with the general formula AlR n X 3-n In the formula, R is hydrogen or C1~C 20 The hydrocarbon group, where X is a halogen, and 1 ≤ n ≤ 3.

14. The catalyst according to claim 13, characterized in that, The catalyst contains an external electron donor component (c), which is selected from the general formula R. 2’ k Si(OR 3’ ) 4-k Compounds, where 0 ≤ k ≤ 3, R 3’ Selected from alkyl, cycloalkyl, aryl, and haloalkyl groups, R 2’ It is selected from alkyl, cycloalkyl, aryl, haloalkyl, amino, substituted amino, halogen, and hydrogen atom.

15. The catalyst according to claim 13 or 14, characterized in that, The molar ratio of component a) to component b) is 1:(5~5000) in terms of titanium:aluminum; and / or, The molar ratio of component a) to component c) is 1:(0~500) in terms of titanium:silicon.

16. The catalyst according to claim 13 or 14, characterized in that, The molar ratio of component a) to component b) is 1:(20~500) in terms of titanium:aluminum; and / or, The molar ratio of component a) to component c) is 1:(3~100) in terms of titanium:silicon.

17. A prepolymerization catalyst for olefin polymerization, said prepolymerization catalyst comprising a prepolymer obtained by prepolymerizing an olefin with a catalyst according to any one of claims 13 to 16, wherein the prepolymerization ratio is 0.1 to 1000 based on the mass ratio of the olefin polymer to the solid catalyst component.

18. The prepolymerization catalyst for olefin polymerization according to claim 17, characterized in that, The olefin used in the prepolymerization is ethylene or propylene.

19. A method for olefin polymerization, wherein the olefin is polymerized under the action of a catalyst according to any one of claims 13 to 16 or a prepolymerization catalyst according to claims 17 or 18.

20. The method according to claim 19, characterized in that, The olefin has the general formula CH2=CHR, where R is hydrogen or C1 to C2. 12 Alkyl or aryl groups.

21. The method according to claim 20, characterized in that, The olefin is selected from ethylene or propylene.

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