A catalyst for olefin polymerization and an olefin polymerization method

Abstract

This invention belongs to the field of olefin polymerization catalyst technology, and relates to a catalyst and a method for olefin polymerization. The catalyst comprises the following reaction products: 1) a solid catalyst component comprising titanium, magnesium, halogen, and an internal electron donor compound; the internal electron donor compound includes a polyol ester compound; 2) an alkylaluminum compound; 3) a complex external electron donor compound comprising an ester compound and a hydrocarbon dihydroxysilane; the ester compound is selected from at least one compound shown in formula (I); in formula (I), R... 1 R 2 Each is independently selected from straight-chain alkyl, branched alkyl, cycloalkyl, alkylaryl, aralkyl, fused-ring aryl, or olefinic groups; R 3 Selected from straight-chain alkyl, branched-chain alkyl, or alkyl groups; R 4 The catalyst is selected from straight-chain alkyl, branched alkyl, cycloalkyl, alkylaryl, aralkyl, or fused-ring aryl groups. The catalyst of this invention exhibits improved polymerization activity and enhanced hydrogen sensitivity.

Description

Technical Field

[0001] This invention belongs to the field of olefin polymerization catalyst technology, and more specifically, relates to a catalyst for olefin polymerization and an olefin polymerization method. Background Technology

[0002] Catalyst systems used in homopolymerization or copolymerization of α-olefins generally consist of three parts: (1) a main catalyst (a solid catalyst component containing titanium and magnesium or a catalyst suspension), (2) a co-catalyst (usually an alkylaluminum compound) and (3) an external electron donor compound added during polymerization.

[0003] It is well known to those skilled in the art that external electron donors (EEGs) are used in polymerization reactions to control the stereoregularity and morphology of polymers. Besides affecting the stereoregularity of polymers, EEGs often influence other aspects of catalyst performance to varying degrees. Although many compounds are known to act as EEGs, different EEGs for specific catalysts may produce different polymer properties. Selecting a suitable EEG that is particularly compatible with a specific catalyst system—that is, finding a suitable EEG can significantly improve certain properties of the polymer product—is highly advantageous.

[0004] CN1169845C and CN1213080C describe catalyst components using polyol ester compounds as internal electron donors, and also use different external electron donors commonly used in industry, such as diisobutyldimethoxysilane and dicyclopentyldimethoxysilane in addition to methylcyclohexyldimethoxysilane. The catalyst system exhibits high activity, high orientation ability and a wide molecular weight distribution of the prepared polymer.

[0005] Patent documents CN02100896.5, CN02100900.7, CN03109781.2, CN03140565.7, CN200410073623.8, and CN200410073621.9 describe catalyst components using polyol esters and phthalic acid esters as internal electron donors. When this catalyst component is used for propylene polymerization, the external electron donor, alkyldihydroxysilane, is a commonly used external electron donor in industry, such as methylcyclohexyldimethoxysilane (CHMMS).

[0006] CN101724102B, CN102234339B, CN1121368C, CN100348624C, CN101560273A, CN1743348A, and US9133286 describe catalyst components that use diether compounds alone or in combination with polyol ester compounds as internal electron donors. When these catalyst components are used for propylene polymerization, the external electron donors used are alkyldihydroxysilanes, which are commonly used in industry, such as methylcyclohexyldimethoxysilane (CHMMS).

[0007] Current research on olefin polymerization catalysts mainly focuses on improving the polymerization activity and stereoregularity of polymers, and these goals have been achieved. However, with the type of external electron donor remaining constant, it is difficult to control polymer properties (such as isotactic index and melt index) to a certain extent by adjusting the amount of external electron donor, thus limiting the application of olefin polymerization catalysts. Therefore, it is necessary to develop a new catalyst to solve this problem. Summary of the Invention

[0008] During their research, the inventors unexpectedly discovered that when a catalyst component containing titanium, magnesium, halogens, and a specific internal electron donor compound is combined with an external electron donor containing a specific structured ester compound during olefin polymerization, polymers with excellent overall performance can be obtained under the same polymerization conditions when combined with the specific catalyst component. By adjusting the polymerization conditions and the composition of the external electron donor, the resulting catalyst maintains high orientation capability while improving polymerization activity and hydrogen sensitivity. Based on this discovery, this invention is proposed.

[0009] To achieve the objectives of this invention, a first aspect of this invention provides a catalyst for olefin polymerization, the catalyst comprising the reaction product of the following components:

[0010] 1) Solid catalyst components, comprising titanium, magnesium, halogens and an internal electron donor compound; wherein the internal electron donor compound is a polyol ester compound;

[0011] 2) Alkyl aluminum compounds;

[0012] 3) A compound of external electron donors, wherein the compound of external electron donors comprises an ester compound and a hydrocarbon dialkyloxysilane;

[0013] The ester compound is selected from at least one of the compounds shown in formula (I);

[0014]

[0015] In equation (Ⅰ), R 1 R 2 Each is independently selected from C1-C20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C7-C 20 alkylaryl, C7-C 20 Aryl groups, C 10 -C 20 Fused ring aryl or C2-C 20 olefinic group; R 3 Selected from C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl or C3-C 20 cycloalkyl; R 4 Selected from C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C7-C 20 alkylaryl, C7-C 20 Aryl or C 10 -C 20 Fused ring aryl groups.

[0016] A second aspect of the present invention provides an olefin polymerization method, the method comprising: contacting one or more olefins with the catalyst for olefin polymerization under olefin polymerization reaction conditions.

[0017] Compared with conventional external electron donors such as C-donor and D-donor, the composite external electron donor compound in the catalyst system of this invention is combined with the solid catalyst components. While maintaining the good overall performance of the catalyst, by adjusting the polymerization conditions and the composition of the composite external electron donor, the resulting catalyst maintains high orientation ability while improving the catalyst polymerization activity and hydrogen sensitivity.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Detailed Implementation

[0019] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0020] To achieve the objectives of this invention, a first aspect of this invention provides a catalyst for olefin polymerization, the catalyst comprising the reaction product of the following components:

[0021] 1) Solid catalyst components, comprising titanium, magnesium, halogens and an internal electron donor compound; wherein the internal electron donor compound is a polyol ester compound;

[0022] 2) Alkyl aluminum compounds;

[0023] 3) A compound of external electron donors, wherein the compound of external electron donors comprises an ester compound and a hydrocarbon dialkyloxysilane;

[0024] The ester compound is selected from at least one of the compounds shown in formula (I);

[0025]

[0026] In equation (Ⅰ), R 1 R 2 Each is independently selected from C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C7-C 20 alkylaryl, C7-C 20 Aryl groups, C 10 -C 20 Fused ring aryl or C2-C 20 olefinic group; R 3 Selected from C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl or C3-C 20 cycloalkyl; R 4 Selected from C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C7-C 20 alkylaryl, C7-C 20 Aryl or C 10 -C 20 Fused ring aryl groups.

[0027] According to the present invention, preferably, the ester compound is selected from dimethyl 2-methoxybenzyl methylene malonate, dimethyl 3-methoxybenzyl methylene malonate, dimethyl 4-methoxybenzyl methylene malonate, dimethyl 2-ethoxybenzyl methylene malonate, dimethyl 3-ethoxybenzyl methylene malonate, dimethyl 4-ethoxybenzyl methylene malonate, dimethyl 2-propoxybenzyl methylene malonate, dimethyl 3-propoxybenzyl methylene malonate, dimethyl 4-propoxybenzyl methylene malonate, dimethyl 2-isopropoxybenzyl methylene malonate, dimethyl 3-isopropoxybenzyl methylene malonate, dimethyl 4-isopropoxybenzyl methylene malonate, dimethyl 2-butoxybenzyl methylene malonate, dimethyl 3-butoxybenzyl methylene malonate, dimethyl 4-but ...2-butoxybenzyl methylene malonate, dimethyl 2-butoxybenzyl methylene malonate, dimethyl 2-butoxybenzyl methylene malonate, dimethyl 2-butoxybenzyl methylene malonate, dimethyl 2-butoxybenzyl methylene malonate, dimethyl 2-butoxybenzyl methylene ma Dimethyl 2-isobutoxybenzyl methylene malonate, dimethyl 2-isobutoxybenzyl methylene malonate, dimethyl 3-isobutoxybenzyl methylene malonate, dimethyl 4-isobutoxybenzyl methylene malonate, diethyl 2-methoxybenzyl methylene malonate, diethyl 3-methoxybenzyl methylene malonate, diethyl 4-methoxybenzyl methylene malonate, diethyl 2-ethoxybenzyl methylene malonate, diethyl 3-ethoxybenzyl methylene malonate, diethyl 4-ethoxybenzyl methylene malonate, diethyl 2-propoxybenzyl methylene malonate, diethyl 3-propoxybenzyl methylene malonate, diethyl 4-propoxybenzyl methylene malonate, diethyl 2-isopropoxybenzyl methylene malonate, diethyl 3-isopropoxybenzyl methylene malonate, diethyl 4-iso ...2-isopropoxybenzyl methylene malonate, diethyl 3-isopropoxybenzyl methylene malonate, diethyl 4-isopropoxybenzyl methylene malonate, diethyl 2-isopropoxybenzyl methylene malonate, diethyl 2-isopropoxybenz Diethyl methyl malonate, 2-butoxybenzyl methylene malonate, 3-butoxybenzyl methylene malonate, 4-butoxybenzyl methylene malonate, 2-isobutoxybenzyl methylene malonate, 3-isobutoxybenzyl methylene malonate, 4-isobutoxybenzyl methylene malonate, 2-methoxybenzyl methylene malonate, 3-methoxybenzyl methylene malonate, 4-methoxybenzyl methylene malonate, 2-ethoxybenzyl methylene malonate, 3-ethoxybenzyl methylene malonate, 4-ethoxybenzyl methylene malonate, 2-propoxybenzyl methylene malonate, 3-propoxybenzyl methylene malonate, 4-propoxybenzyl methylene malonate Dipropyl ester, 2-isopropoxybenzyl methylene malonate dipropyl ester, 3-isopropoxybenzyl methylene malonate dipropyl ester, 4-isopropoxybenzyl methylene malonate dipropyl ester, 2-butoxybenzyl methylene malonate dipropyl ester, 3-butoxybenzyl methylene malonate dipropyl ester, 4-butoxybenzyl methylene malonate dipropyl ester, 2-isobutoxybenzyl methylene malonate dipropyl ester, 3-isobutoxybenzyl methylene malonate dipropyl ester, 4-isobutoxybenzyl methylene malonate dipropyl ester, 2-methoxybenzyl methylene succinate dimethyl ester, 3-methoxybenzyl methylene succinate dimethyl ester, 4-methoxybenzyl methylene succinate dimethyl ester, 2-ethoxybenzyl methylene succinate dimethyl ester, 3-ethoxybenzyl methylene succinate dimethyl ester, 4-ethoxybenzyl methylene succinate dimethyl ester,Dimethyl 2-propoxybenzyl succinate, dimethyl 3-propoxybenzyl succinate, dimethyl 4-propoxybenzyl succinate, dimethyl 2-isopropoxybenzyl succinate, dimethyl 3-isopropoxybenzyl succinate, dimethyl 4-isopropoxybenzyl succinate, dimethyl 2-butoxybenzyl succinate, dimethyl 3-butoxybenzyl succinate, dimethyl 4-butoxybenzyl succinate, dimethyl 2-isobutoxybenzyl succinate, dimethyl 3-isobutoxybenzyl succinate, dimethyl 4-isobutoxybenzyl succinate Diethyl 2-methoxybenzyl succinate, diethyl 3-methoxybenzyl succinate, diethyl 4-methoxybenzyl succinate, diethyl 2-ethoxybenzyl succinate, diethyl 3-ethoxybenzyl succinate, diethyl 4-ethoxybenzyl succinate, diethyl 2-propoxybenzyl succinate, diethyl 3-propoxybenzyl succinate, diethyl 4-propoxybenzyl succinate, diethyl 2-isopropoxybenzyl succinate, diethyl 3-isopropoxybenzyl succinate, diethyl 4-isopropoxybenzyl succinate, diethyl 2-butanediol Diethyl butyroxene benzene succinate, 3-butyroxene benzene succinate, 4-butyroxene benzene succinate, 2-isobutyroxene benzene succinate, 3-isobutyroxene benzene succinate, 4-isobutyroxene benzene succinate, 2-methoxybenzene benzene succinate, 3-methoxybenzene benzene succinate, 4-methoxybenzene benzene succinate, 2-ethoxybenzene benzene succinate, 3-ethoxybenzene benzene succinate, 4-ethoxybenzene benzene succinate, 2-propoxybenzene benzene At least one of the following: dipropyl methylene succinate, 3-propoxybenzyl methylene succinate, 4-propoxybenzyl methylene succinate, 2-isopropoxybenzyl methylene succinate, 3-isopropoxybenzyl methylene succinate, 4-isopropoxybenzyl methylene succinate, 2-butoxybenzyl methylene succinate, 3-butoxybenzyl methylene succinate, 4-butoxybenzyl methylene succinate, 2-isobutoxybenzyl methylene succinate, 3-isobutoxybenzyl methylene succinate, and 4-isobutoxybenzyl methylene succinate.

[0028] In this invention, the ester compound can be prepared using conventional synthetic methods or purchased using general chemical product procurement methods.

[0029] According to the present invention, preferably, the hydrocarbon dihydroxysilane is selected from at least one of the compounds represented by formula (II);

[0030]

[0031] In equation (II), R1, R2, R3, and R4 may be the same or different, and each is independently selected from C. 1～ C 20 Straight-chain alkyl, C3-C 20 Branched alkyl or C3-C 20 cycloalkyl groups.

[0032] Preferably, the hydrocarbon dihydroxysilane is selected from at least one of methylcyclohexyldimethoxysilane, diisopropyldimethoxysilane, diisobutyldimethoxysilane, dicyclohexyldimethoxysilane, dicyclopentyldimethoxysilane, methylcyclohexyldiethoxysilane, diisopropyldiethoxysilane, diisobutyldiethoxysilane, dicyclohexyldiethoxysilane, dicyclopentyldiethoxysilane, methylcyclohexyldipropoxysilane, diisopropyldipropoxysilane, diisobutyldipropoxysilane, dicyclohexyldipropoxysilane, dicyclopentyldipropoxysilane, methylcyclohexyldibutoxysilane, diisopropyldibutoxysilane, diisobutyldibutoxysilane, dicyclohexyldibutoxysilane, and dicyclopentyldibutoxysilane.

[0033] More preferably, the hydrocarbon dihydroxysilane is methylcyclohexyldimethoxysilane and / or dicyclopentyldimethoxysilane.

[0034] In this invention, the hydrocarbon dihydroxysilane can be prepared in the laboratory using common synthetic methods, or it can be purchased commercially according to general chemical product procurement methods.

[0035] According to the present invention, preferably, the amount of the ester compound is 0.001-1.0 moles based on aluminum in each mole of the alkylaluminum compound, and the amount of the alkyldialkoxysilane is 0.001-1.0 moles; the two can be added together or separately; and the molar ratio of the ester compound to the alkyldialkoxysilane is 1:100 to 100:1, preferably 1:50-50:1.

[0036] During the polymerization process, the external electron-donating compound can be added after pre-contacting the solid catalyst components for a period of time, or after being mixed with the solid catalyst components for a short time, or at different stages of polymerization.

[0037] The solid catalyst component of the present invention can be prepared according to conventional methods in the prior art. The solid catalyst component can be prepared by the following method:

[0038] Method 1: In an inert diluent, a magnesium compound and an organic epoxy compound are brought into contact to form a homogeneous solution. Then, in the presence of a precipitation aid, the homogeneous solution is brought into contact with a titanium compound and an internal electron donor compound to react and obtain a solid catalyst component.

[0039] Method 2: React titanium compounds, magnesium compounds, and internal electron donor compounds to obtain solid catalyst components;

[0040] Preferably, it includes the following steps:

[0041] 1) At a temperature of -30℃ to 0℃, titanium compounds are mixed with spherical magnesium halide alcohol carriers to obtain a carrier suspension;

[0042] 2) The carrier suspension is heated to 80-130℃, and an internal electron donor compound is added during the heating process. The mixture is kept at a constant temperature for 0.2-2 hours to obtain a solid precipitate.

[0043] 3) The solid precipitate is washed and dried to obtain the solid catalyst component.

[0044] Optionally, in step 3), the solid precipitate is treated with a titanium compound before washing. This treatment may be performed once or multiple times. The inert solvent used for washing may be one or more of hexaane, heptane, octane, decane, and toluene.

[0045] Additionally, in step 1), the mixing may optionally be carried out in the presence of an inert solvent.

[0046] According to the present invention, preferably, the polyol ester compound is a diol ester compound. When the internal electron donor compound is a diol ester compound, in preferred cases, non-limiting examples of the internal electron donor compound include: 2-isopropyl-2-isopentyl-1,3-propanediol dibenzoate, 2,4-pentanediol dibenzoate, 3,5-heptanediol dibenzoate, 4-ethyl-3,5-heptanediol dibenzoate, 9,9-bis(benzylcarboxymethyl)fluorene, etc.

[0047] According to the present invention, preferably, the content of the internal electron donor compound in the solid catalyst component is 0.01-5 moles per mole of magnesium.

[0048] According to the present invention, preferably, the internal electron donor compound further includes a carboxylic acid ester compound and / or an ether compound.

[0049] According to the present invention, preferably, the carboxylic acid ester compound is a mono- or poly-aliphatic carboxylic acid ester and / or an aromatic carboxylic acid ester compound.

[0050] Preferably, the carboxylic acid ester compound is selected from at least one of benzoate, phthalate, malonate, succinate and glutarate.

[0051] More preferably, the carboxylic acid ester compound is selected from ethyl benzoate, diethyl phthalate, diisobutyl phthalate, di-n-butyl phthalate, diisooctyl phthalate, di-n-octyl phthalate, diethyl malonate, dibutyl malonate, diethyl 2,3-diisopropylsuccinate, diisobutyl 2,3-diisopropylsuccinate, di-n-butyl 2,3-diisopropylsuccinate, dimethyl 2,2-dimethylsuccinate. The first of the following: diisobutyl ester, diisobutyl 2-ethyl-2-methylsuccinate, diethyl 2-ethyl-2-methylsuccinate, diethyl adipate, dibutyl adipate, diethyl sebacate, dibutyl sebacate, diethyl maleate, di-n-butyl maleate, diethyl naphthalene dicarboxylate, dibutyl naphthalene dicarboxylate, triethyl trimellitate, tributyl trimellitate, triethyl phenyltrimethylbenzene, tributyl phenyltrimethylbenzene, tetraethyl pyromellitic acid, and tetrabutyl pyromellitic acid.

[0052] More preferably, the carboxylic acid ester compound is dibutyl phthalate or diisobutyl phthalate.

[0053] According to the present invention, preferably, the ether compound is a diether compound, preferably selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2-phenylethyl)-1,3-dimethoxypropane, 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(p-chlorophenyl)-1,3-dimethoxypropane, 2-(diphenylmethyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane. Propane, 2,2-dicyclopentyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2,2-bis(2-cyclohexyl) 2-Methyl-2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-bis(cyclohexylmethyl)-1,3-dimethoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2-(1-methylbutyl)-2-isopropyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, 2-phenyl-2-isopropyl-1,3-dimethyl At least one of oxypropane, 2-phenyl-2-sec-butyl-1,3-dimethoxypropane, 2-benzyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclohexyl-2-sec-butyl-1,3-dimethoxypropane, 2-isopropyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane, and 9,9-dimethoxymethylfluorene; more preferably 2-isopropyl-2-isopentyl-1,3-dimethoxypropane.

[0054] Preferably, the molar ratio of the polyol ester compound to the carboxylic acid ester compound and / or ether compound is 1:10-10:1.

[0055] In the preparation process of the solid catalyst component of the present invention, if two or more internal electron donors are contained, the internal electron donor compounds can be used in a variety of ways, can be used in different steps and under different conditions, or can be added at the same time, and the order of addition of the internal electron donor compounds is not important.

[0056] The specific operation of Method 1 can be carried out according to the preparation method of solid catalyst disclosed in patent documents CN102464746A and CN1258684A, and all relevant contents disclosed therein are incorporated into this invention as reference.

[0057] Specifically, the magnesium compound is selected from magnesium halides, preferably magnesium chloride.

[0058] Preferably, the organic epoxy compound is selected from at least one of aliphatic olefins, dienes, or oxides of halogenated aliphatic olefins or dienes having 2-8 carbon atoms, glycidyl ethers, and internal ethers, and more preferably from at least one of ethylene oxide, propylene oxide, epibutylene oxide, epichlorohydrin, methyl glycidyl ether, diglycidyl ether, and tetrahydrofuran.

[0059] Preferably, the precipitation aid is selected from at least one of organic anhydrides, organic acids, ethers, and ketones, and more preferably from at least one of 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, and pentyl ether.

[0060] Preferably, the amount of organic epoxy compound used is 0.2-10 moles relative to each mole of magnesium element, and the amount of precipitation aid used is 0.03-1 mole.

[0061] In Method 2, the spherical magnesium halide alcohol support can be obtained by referring to the preparation methods of CN1091748A, CN1330086A, CN101050245A, US6020279A, CN1580136A and CN1463990A, and all relevant contents disclosed therein are incorporated herein by reference.

[0062] Specifically, the preparation method of spherical magnesium halide alcohol carriers may include: mixing magnesium halide and low-carbon alcohols, heating the mixture to generate a magnesium halide alcohol melt at a temperature of 90–140°C, subjecting it to high shear in a dispersion medium, and then placing it in a cooled inert medium to form spherical magnesium halide alcohol particles. After washing and drying, the spherical carrier is obtained. The high shear can be obtained using conventional methods, such as high-speed stirring (e.g., CN00109216.2), spraying (e.g., US6020279A), high-gravity rotating bed (e.g., CN1580136A), and emulsifier methods (e.g., CN1463990A). The dispersant system can use hydrocarbon inert solvents, such as kerosene, white oil, silicone oil, paraffin oil, and petrolatum oil. The cooled inert medium can be selected from pentane, hexane, heptane, petroleum ether, and raffinate oil.

[0063] According to the present invention, preferably, the titanium compound has the general formula Ti(OR) w ) 4-k X' k , where R w For C1-C 20 Alkyl group, X' being Cl, Br, or I, and k being an integer from 0 to 4; 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, titanium trichloroethoxy, and titanium trichloride, more preferably titanium tetrachloride.

[0064] Preferably, in the solid catalyst component, the content of the titanium compound is 0.5-150 moles per mole of magnesium.

[0065] According to the present invention, preferably, the alkylaluminum compound has the general formula AlR”' d X 1 3-d , where R”' is C l -C8 alkyl, X 1 For halogens, 0 < d ≤ 3, when there are two or three R”’, each R”’ may be the same or different.

[0066] Preferably, the alkylaluminum compound is triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, or Al(n-C6H) 13 3. Al(n-C8H) 17 At least one of )3 and AlEt2Cl.

[0067] Preferably, the molar ratio of aluminum in the alkylaluminum compound to titanium in the solid catalyst component is 1-1000:1, more preferably 1-500:1.

[0068] In this invention, the alkylaluminum compound and the external electron donor compound can be contacted with the solid catalyst component alone or as a mixture of the two components.

[0069] Depending on the different requirements for polymer performance, the catalyst described in this invention can be directly used in the polymerization reaction of olefins; alternatively, it can be prepolymerized with prepolymerized olefins to generate a prepolymerized catalyst, and then polymerized with olefins.

[0070] A second aspect of the present invention provides an olefin polymerization method, the method comprising: contacting one or more olefins with the catalyst for olefin polymerization under olefin polymerization reaction conditions.

[0071] In this invention, the general formula of the olefin can be CH2=CH-R. V , where R V It is hydrogen or C1 to C6 alkyl.

[0072] Non-limiting examples of the olefins include: ethylene, propylene, butene, pentene, hexene, octene, and 4-methyl-1-pentene. Preferably, the olefin is propylene and / or ethylene; more preferably, the olefin is propylene.

[0073] In addition, depending on the specific application requirements, the olefin can undergo polymerization in the presence of a small amount of diene.

[0074] In this invention, the olefin polymerization reaction can be carried out in the liquid phase (liquid phase monomer or monomer dissolved in an inert solvent) or the gas phase, or it can be carried out in a combination of liquid phase and gas phase polymerization stages. The olefin polymerization reaction can be carried out according to known polymerization techniques, such as conventional techniques like slurry polymerization, gas-phase fluidized bed polymerization, etc.

[0075] The olefin polymerization conditions include: a polymerization temperature of 0–150°C, preferably 60–90°C, and a polymerization pressure of atmospheric pressure or higher.

[0076] The present invention will be further described below with reference to the embodiments, but the scope of the present invention is not limited to these embodiments.

[0077] In the following examples and comparative examples,

[0078] 1) The isotactic index of polymers is determined by the n-heptane extraction method. According to GB / T 2412-2008, 2g of dried polymer sample is placed in an extractor and extracted with boiling n-heptane for 6 hours. The residue is then dried to constant weight. The ratio of the obtained polymer weight (g) to 2 is the isotactic index.

[0079] 2) Polymer melt index: determined according to GB3682-2000 at 230℃ and 2.16kg load.

[0080] Preparation Example 1

[0081] This preparation example illustrates the preparation of solid catalyst components.

[0082] In a 300 mL stirred glass reaction flask fully purged with high-purity nitrogen, 90 mL of titanium tetrachloride and 10 mL of hexane were added. The mixture was cooled to -20 °C, and 8 g of spherical magnesium chloride ethanolate (prepared according to the method of Example 1, CN1330086A, with a molar ratio of ethanol to magnesium chloride of 2.62 in the support) was added. Then, under stirring, the temperature was slowly increased in stages. When the temperature reached 40 °C, 4.9 mmol of 2,4-pentanediol dibenzoate and 4.5 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added. The temperature was further increased to 110 °C and held for 0.5 h to obtain a solid precipitate. The liquid was filtered off, and 100 mL of titanium tetrachloride was added to the solid each time, treating it at 110 °C for 1 hour. This treatment step was repeated 3 times. The solid was then washed 5 times with hexane and finally dried under vacuum to obtain solid catalyst component A.

[0083] Preparation Example 2

[0084] This preparation example illustrates the preparation of solid catalyst components.

[0085] In a 300 mL stirred glass reaction flask that has been fully purged with high-purity nitrogen, 100 mL of titanium tetrachloride was added, and the mixture was cooled to -20 °C. 8 g of spherical magnesium chloride ethanolate (prepared according to the method of Example 1, CN1330086A, with a molar ratio of ethanol to magnesium chloride of 2.62 in the carrier) was added. The mixture was slowly heated to 110 °C in stages. During the heating process, 2.5 mmol of 2,4-pentanediol dibenzoate and 3.9 mmol of dibutyl phthalate prepared in Example 1 were added. After maintaining the temperature at 110 °C for 0.5 h, a solid precipitate was obtained. The liquid was filtered off, and the mixture was treated twice with 100 mL of titanium tetrachloride each time. The mixture was then washed five times with hexane and dried under vacuum to obtain solid catalyst component B.

[0086] Preparation Example 3

[0087] This preparation example illustrates the preparation of the solid catalyst components of the present invention.

[0088] 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 (TBP) were added sequentially. The mixture was heated to 50 °C with stirring and maintained for 2.5 hours to allow the solid to completely dissolve. Then, 1.4 g of phthalic anhydride was added, and the temperature was maintained for another hour. The solution was cooled to below -25 °C, and 56 mL of TiCl4 was added dropwise over one hour. The temperature was slowly raised to 80 °C, during which a solid gradually precipitated. 6 mmol of 2,4-pentanediol dibenzoate was added, and the temperature was maintained for one hour. After filtration, 70 mL of toluene was added, and the mixture was washed twice to obtain a solid precipitate. Then, 60 mL of toluene and 40 mL of TiCl4 were added to this solid, and the temperature was raised to 100 °C and treated for 2 hours. After discarding the filtrate, this treatment process was repeated. 60 mL of toluene was added, and the mixture was washed three times in a boiling state. Then, 60 mL of hexane was added, and the mixture was washed twice in a boiling state to obtain solid catalyst component C.

[0089] Examples 1 to 30 illustrate the catalyst and olefin polymerization method of the present invention.

[0090] Examples 1-8

[0091] In a 5-liter high-pressure reactor, the reactor was purged with a nitrogen stream at 70°C for 1 hour. Then, the reactor was replaced three times with gaseous propylene. Under nitrogen protection, 5 mL of a hexane solution of triethylaluminum (TEAL) (0.5 mmol / mL), a hexane solution of a composite external electron donor (0.1 mmol / mL), 10 mL of anhydrous hexane, and 4–12 mg of solid catalyst component A were introduced. The high-pressure reactor was closed, and a predetermined amount of hydrogen and 1.0–1.2 kg of liquid propylene were introduced. The reactor temperature was rapidly raised to 70°C with stirring. After polymerization at 70°C for 1 hour (polymerization time experiment see notes), stirring was stopped, unpolymerized propylene monomers were removed, the polymer was collected, and vacuum dried at 70°C for 2 hours to obtain polypropylene. The added external electron donors were one of dimethyl 4-methoxyphenylmethylene malonate (DMPMBM) and 1,3-diethyl 2-[(3-methoxyphenyl)methylene]malonate (MPMPDE). The composition and ratio of the external electron donors, the amount of hydrogen added, and the polymerization performance of the catalyst are shown in Table 1.

[0092] Examples 9-22

[0093] Propylene polymerization was carried out according to the methods of Examples 1-8, except that catalyst B was used as the main catalyst during polymerization. The composition and ratio of external electron donors, hydrogenation amount, and catalyst polymerization performance are shown in Table 1.

[0094] Examples 23-30

[0095] Propylene polymerization was carried out according to the methods of Examples 1-8, except that catalyst C was used as the main catalyst during polymerization. The composition and ratio of external electron donors, hydrogenation amount, and catalyst polymerization performance are shown in Table 1.

[0096] Comparative Examples 1-2

[0097] The polymerization method was the same as in Examples 1-8, except that catalyst A was used as the main catalyst, and the added external electron donor was replaced with a hexane solution of methylcyclohexyldimethoxysilane (C-donor) (C-donor concentration was 0.1 mmol / mL), thereby obtaining polypropylene. The hydrogenation amount and catalyst polymerization performance are shown in Table 1.

[0098] Comparative Examples 3-6

[0099] The polymerization method was the same as in Examples 1-8, except that catalyst B was used as the main catalyst, and the added external electron donor was replaced with a hexane solution of methylcyclohexyldimethoxysilane (C-donor) or dicyclopentyldimethoxysilane (D-donor) (the concentration of C-donor was 0.1 mmol / mL), thereby obtaining polypropylene. The hydrogenation amount and catalyst polymerization performance are shown in Table 1.

[0100] Comparative Examples 7-10

[0101] The polymerization method was the same as in Examples 1-8, except that catalyst C was used as the main catalyst, and the added external electron donor was replaced with a hexane solution of methylcyclohexyldimethoxysilane (C-donor) or dicyclopentyldimethoxysilane (D-donor) (the concentrations of C-donor and D-donor were 0.1 mmol / mL), thereby obtaining polypropylene. The hydrogenation amount and catalyst polymerization performance are shown in Table 1.

[0102] Table 1

[0103]

[0104]

[0105] in:

[0106] DMPMBM, dimethyl 4-methoxybenzyl methylene malonate;

[0107] MPMPDE, 1,3-diethyl 2-[(3-methoxyphenyl)methylene]-malonic acid;

[0108] C-donor, cyclohexylmethyldimethoxysilane;

[0109] D-donor, dicyclopentyldimethoxysilane.

[0110] As shown in Table 1, using the composite external electron donor of this invention, combined with different main catalysts, yields polymers with superior performance. Specifically, the catalyst of this invention maintains high orientation capability while exhibiting improved polymerization activity and enhanced hydrogen sensitivity.

[0111] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0112] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. 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.

Claims

1. A catalyst for olefin polymerization, characterized in that, The catalyst comprises the following reaction products: 1) Solid catalyst components, comprising titanium, magnesium, halogens and internal electron donor compounds; wherein the internal electron donor compounds are glycol ester compounds and diether compounds; the molar ratio of glycol ester compounds and diether compounds is 1:10-10:1; 2) Alkyl aluminum compounds; 3) A compound of external electron donors, wherein the compound of external electron donors is an ester compound and a hydrocarbon dialkoxysilane; and the molar ratio of the ester compound and the hydrocarbon dialkoxysilane is 1:1; The ester compound is selected from at least one of the compounds shown in formula (I); Equation (I) In equation (Ⅰ), R 1 R 2 Each is independently selected from C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C7-C 20 alkylaryl, C7-C 20 Aryl groups, C 10 -C 20 Fused ring aryl or C2-C 20 olefinic group; R 3 Selected from C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl or C3-C 20 cycloalkyl; R 4 Selected from C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C7-C 20 alkylaryl, C7-C 20 Aryl or C 10 -C 20 Fused ring aryl groups.

2. The catalyst for olefin polymerization according to claim 1, wherein, The ester compound is selected from dimethyl 2-methoxybenzyl methylene malonate, dimethyl 3-methoxybenzyl methylene malonate, dimethyl 4-methoxybenzyl methylene malonate, dimethyl 2-ethoxybenzyl methylene malonate, dimethyl 3-ethoxybenzyl methylene malonate, dimethyl 4-ethoxybenzyl methylene malonate, dimethyl 2-propoxybenzyl methylene malonate, dimethyl 3-propoxybenzyl methylene malonate, dimethyl 4-propoxybenzyl methylene malonate, dimethyl 2-isopropoxybenzyl methylene malonate, dimethyl 3-isopropoxybenzyl methylene malonate, dimethyl 4-isopropoxybenzyl methylene malonate, dimethyl 2-butoxybenzyl methylene malonate, dimethyl 3-butoxybenzyl methylene malonate, dimethyl 4-but ...2-butoxybenzyl methylene malonate, dimethyl 3-butoxybenzyl methylene malonate, dimethyl 2-butoxybenzyl methylene malonate, dimethyl 3-butoxybenzyl methylene malonate, dimethyl 2-butoxybenzyl methylene malonate, dimethyl 3- Dimethyl methoxybenzyl malonate, 2-isobutoxybenzyl malonate, 3-isobutoxybenzyl malonate, 4-isobutoxybenzyl malonate, 2-methoxybenzyl malonate, 3-methoxybenzyl malonate, 4-methoxybenzyl malonate, 2-ethoxybenzyl malonate, 3-ethoxybenzyl malonate, 4-ethoxybenzyl malonate, 2-propoxybenzyl malonate, 3-propoxybenzyl malonate, 4-propoxybenzyl malonate, 2-isopropoxybenzyl malonate, 3-propoxybenzyl malonate, 4-propoxybenzyl malonate, 2-isopropoxybenzyl malonate, 3-isopropoxybenzyl malonate, 4-isopropoxybenzyl malonate Diethyl ester, 2-butoxybenzyl methylene malonate diethyl ester, 3-butoxybenzyl methylene malonate diethyl ester, 4-butoxybenzyl methylene malonate diethyl ester, 2-isobutoxybenzyl methylene malonate diethyl ester, 3-isobutoxybenzyl methylene malonate diethyl ester, 4-isobutoxybenzyl methylene malonate diethyl ester, 2-methoxybenzyl methylene malonate dipropyl ester, 3-methoxybenzyl methylene malonate dipropyl ester, 4-methoxybenzyl methylene malonate dipropyl ester, 2-ethoxybenzyl methylene malonate dipropyl ester, 3-ethoxybenzyl methylene malonate dipropyl ester, 4-ethoxybenzyl methylene malonate dipropyl ester, 2-propoxybenzyl methylene malonate dipropyl ester, 3-propoxybenzyl methylene malonate dipropyl ester, 4-propoxybenzyl methylene malonate dipropyl ester 2-Isopropoxybenzyl methylene malonate dipropyl ester, 3-Isopropoxybenzyl methylene malonate dipropyl ester, 4-Isopropoxybenzyl methylene malonate dipropyl ester, 2-Butoxybenzyl methylene malonate dipropyl ester, 3-Butoxybenzyl methylene malonate dipropyl ester, 4-Butoxybenzyl methylene malonate dipropyl ester, 2-Isobutoxybenzyl methylene malonate dipropyl ester, 3-Isobutoxybenzyl methylene malonate dipropyl ester, 4-Isobutoxybenzyl methylene malonate dipropyl ester, 2-Methoxybenzyl methylene succinate dimethyl ester, 3-Methoxybenzyl methylene succinate dimethyl ester, 4-Methoxybenzyl methylene succinate dimethyl ester, 2-Ethoxybenzyl methylene succinate dimethyl ester, 3-Ethoxybenzyl methylene succinate dimethyl ester, 4-Ethoxybenzyl methylene succinate dimethyl ester,Dimethyl 2-propoxybenzyl succinate, dimethyl 3-propoxybenzyl succinate, dimethyl 4-propoxybenzyl succinate, dimethyl 2-isopropoxybenzyl succinate, dimethyl 3-isopropoxybenzyl succinate, dimethyl 4-isopropoxybenzyl succinate, dimethyl 2-butoxybenzyl succinate, dimethyl 3-butoxybenzyl succinate, dimethyl 4-butoxybenzyl succinate, dimethyl 2-isobutoxybenzyl succinate, dimethyl 3-isobutoxybenzyl succinate, dimethyl 4-isobutoxybenzyl succinate Diethyl 2-methoxybenzyl succinate, diethyl 3-methoxybenzyl succinate, diethyl 4-methoxybenzyl succinate, diethyl 2-ethoxybenzyl succinate, diethyl 3-ethoxybenzyl succinate, diethyl 4-ethoxybenzyl succinate, diethyl 2-propoxybenzyl succinate, diethyl 3-propoxybenzyl succinate, diethyl 4-propoxybenzyl succinate, diethyl 2-isopropoxybenzyl succinate, diethyl 3-isopropoxybenzyl succinate, diethyl 4-isopropoxybenzyl succinate, diethyl 2-butanediol Diethyl butyroxene benzene succinate, 3-butyroxene benzene succinate, 4-butyroxene benzene succinate, 2-isobutyroxene benzene succinate, 3-isobutyroxene benzene succinate, 4-isobutyroxene benzene succinate, 2-methoxybenzene benzene succinate, 3-methoxybenzene benzene succinate, 4-methoxybenzene benzene succinate, 2-ethoxybenzene benzene succinate, 3-ethoxybenzene benzene succinate, 4-ethoxybenzene benzene succinate, 2-propoxybenzene benzene At least one of the following: dipropyl methylene succinate, 3-propoxybenzyl methylene succinate, 4-propoxybenzyl methylene succinate, 2-isopropoxybenzyl methylene succinate, 3-isopropoxybenzyl methylene succinate, 4-isopropoxybenzyl methylene succinate, 2-butoxybenzyl methylene succinate, 3-butoxybenzyl methylene succinate, 4-butoxybenzyl methylene succinate, 2-isobutoxybenzyl methylene succinate, 3-isobutoxybenzyl methylene succinate, and 4-isobutoxybenzyl methylene succinate.

3. The catalyst for olefin polymerization according to claim 1, wherein, The hydrocarbon dihydroxysilane is selected from at least one of the compounds shown in formula (II); Formula (II) In equation (II), R1, R2, R3, and R4 may be the same or different, and each is independently selected from C1-C2. 20 Straight-chain alkyl, C3-C 20 Branched alkyl or C3-C 20 cycloalkyl groups.

4. The catalyst for olefin polymerization according to claim 3, wherein, The alkyl dihydroxysilane is selected from at least one of methylcyclohexyldimethoxysilane, diisopropyldimethoxysilane, diisobutyldimethoxysilane, dicyclohexyldimethoxysilane, dicyclopentyldimethoxysilane, methylcyclohexyldiethoxysilane, diisopropyldiethoxysilane, diisobutyldiethoxysilane, dicyclohexyldiethoxysilane, dicyclopentyldiethoxysilane, methylcyclohexyldipropoxysilane, diisopropyldipropoxysilane, diisobutyldipropoxysilane, dicyclohexyldipropoxysilane, dicyclopentyldipropoxysilane, methylcyclohexyldibutoxysilane, diisopropyldibutoxysilane, diisobutyldibutoxysilane, dicyclohexyldibutoxysilane, and dicyclopentyldibutoxysilane.

5. The catalyst for olefin polymerization according to claim 4, wherein, The hydrocarbon-based dihydroxysilane is methylcyclohexyldimethoxysilane and / or dicyclopentyldimethoxysilane.

6. The catalyst for olefin polymerization according to claim 1, wherein, The amount of the ester compound used is 0.001-1.0 mol based on aluminum per mole of the alkylaluminum compound, and the amount of the hydrocarbon dialkoxysilane used is 0.001-1.0 mol.

7. The catalyst for olefin polymerization according to claim 1, wherein, The solid catalyst component is prepared by either method one or method two: Method 1: In an inert diluent, magnesium halide and an organic epoxy compound are brought into contact to form a homogeneous solution. Then, in the presence of a precipitation aid, the homogeneous solution is brought into contact with a titanium compound and an internal electron donor compound to react and obtain a solid catalyst component. Method 2: React titanium compounds, spherical magnesium halide alkoxides, and internal electron donor compounds to obtain solid catalyst components.

8. The catalyst for olefin polymerization according to claim 7, wherein, Method 2 includes the following steps: 1) At a temperature of -30℃ to 0℃, titanium compounds are mixed with spherical magnesium halide alcohol carriers to obtain a carrier suspension; 2) The carrier suspension is heated to 80-130℃, and an internal electron donor compound is added during the heating process. The mixture is kept at a constant temperature for 0.2-2 hours to obtain a solid precipitate. 3) The solid precipitate is washed and dried to obtain the solid catalyst component.

9. The catalyst for olefin polymerization according to claim 1 or 8, wherein, In the solid catalyst component, the content of the internal electron donor compound is 0.01-5 moles per mole of magnesium.

10. The catalyst for olefin polymerization according to claim 9, wherein, The diol ester compound is selected from at least one of 2-isopropyl-2-isopentyl-1,3-propanediol dibenzoate, 2,4-pentanediol dibenzoate, 3,5-heptanediol dibenzoate and 4-ethyl-3,5-heptanediol dibenzoate.

11. The catalyst for olefin polymerization according to claim 1, wherein, The diether compound is selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-n-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2-phenylethyl)-1,3-dimethoxypropane, 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(p-chlorophenyl)-1,3-dimethoxypropane, 2-(diphenylmethyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl ... Cyclopentyl-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-methyl-2-n-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2,2- Bis(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-methyl-2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-bis(cyclohexylmethyl)-1,3-dimethoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2-(1-methylbutyl)-2-isopropyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, At least one of 2-phenyl-2-isopropyl-1,3-dimethoxypropane, 2-phenyl-2-sec-butyl-1,3-dimethoxypropane, 2-benzyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclohexyl-2-sec-butyl-1,3-dimethoxypropane, 2-isopropyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane, and 9,9-dimethoxymethylfluorene.

12. The catalyst for olefin polymerization according to claim 11, wherein, The diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane.

13. The catalyst for olefin polymerization according to claim 7, wherein, In Method 1, The organic epoxy compound is selected from at least one of aliphatic olefins, dienes, or oxides of halogenated aliphatic olefins or dienes, glycidyl ethers, and internal ethers having 2-8 carbon atoms. The precipitation aid is selected from at least one of organic acid anhydrides, organic acids, ethers, and ketones; Of these, the amount of organic epoxy compound used is 0.2-10 moles per mole of magnesium, and the amount of precipitation aid used is 0.03-1 mole.

14. The catalyst for olefin polymerization according to claim 7, wherein, The magnesium halide is magnesium chloride.

15. The catalyst for olefin polymerization according to claim 13, wherein, The organic epoxy compound is selected from at least one of ethylene oxide, propylene oxide, butane oxide, epichlorohydrin, methyl glycidyl ether, diglycidyl ether, and tetrahydrofuran.

16. The catalyst for olefin polymerization according to claim 13, wherein, The precipitation aid is selected from at least one of 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, methyl ether, diethyl ether, propyl ether, butyl ether, and pentyl ether.

17. The catalyst for olefin polymerization according to claim 7, wherein, In Method 2, the structural formula of the magnesium halide alkoxide support is MgX2·p(ROH), where X is Cl, Br, or I; and R is C1-C2. 18 Alkyl group; p = 0.1-6.

18. The catalyst for olefin polymerization according to claim 17, wherein, X is Cl.

19. The catalyst for olefin polymerization according to claim 17, wherein, R is a C2-C4 straight-chain alkyl group.

20. The catalyst for olefin polymerization according to claim 7, wherein, The general formula of the titanium compound is Ti(OR) w ) 4-k X' k , where R w For C1-C 20 Alkyl group, where X' is Cl, Br, or I, and k is an integer from 0 to 4; In the solid catalyst component, the content of the titanium compound is 0.5-150 moles per mole of magnesium.

21. The catalyst for olefin polymerization according to claim 20, wherein, The titanium compound is selected from at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tetrabutoxy, titanium tetraethoxy, titanium monochlorotriethoxy, titanium dichlorodiethoxy, titanium trichloromonethoxy, and titanium trichloride.

22. The catalyst for olefin polymerization according to claim 21, wherein, The titanium compound is titanium tetrachloride.

23. The catalyst for olefin polymerization according to claim 1, wherein, The general formula of the alkylaluminum compound is AlR''' d X 1 3-d Where R''' is C l -C8 alkyl, X 1 For halogens, 0 < d ≤ 3, when there are two or three R''', each R''' may be the same or different; The molar ratio of aluminum in the alkylaluminum compound to titanium in the solid catalyst component is 1-1000:

1.

24. The catalyst for olefin polymerization according to claim 23, wherein, The alkylaluminum compound is triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, or Al(n-C6H) 13 3. Al(n-C8H) 17 At least one of )3 and AlEt2Cl.

25. The catalyst for olefin polymerization according to claim 23, wherein, The molar ratio of aluminum in the alkylaluminum compound to titanium in the solid catalyst component is 1-500:

1.

26. A method for olefin polymerization, characterized in that, The method comprises: contacting one or more olefins with a catalyst for olefin polymerization as described in any one of claims 1-25 under olefin polymerization reaction conditions; wherein the olefin has the general formula CH2=CH-R. V , where R V It is hydrogen or C1-C6 alkyl; The olefin polymerization reaction conditions include: polymerization temperature of 0-150℃ and polymerization pressure of atmospheric pressure or higher.

27. The olefin polymerization method according to claim 26, wherein, The olefin is propylene and / or ethylene.

28. The olefin polymerization method according to claim 27, wherein, The olefin is propylene.

29. The olefin polymerization method according to claim 26, wherein, The polymerization temperature is 60-90℃.

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