Catalyst component for olefin polymerization, catalyst and application

Abstract

The invention belongs to the technical field of olefin polymerization catalysts, and discloses a catalyst component for olefin polymerization, a catalyst and an application thereof, wherein the catalyst component comprises a reaction product of the following components: a magnesium source, a titanium source and an internal electron donor, wherein the internal electron donor comprises a monoether compound and a diether compound; the molar ratio of the amount of the magnesium source calculated by the magnesium element, the amount of the titanium source calculated by the titanium element and the internal electron donor is 1:15-180:0.1-0.9, and the amount of the monoether compound is 0.05-0.9 moles per mole of the diether compound. The catalyst has high polymerization activity.

Description

Technical Field

[0001] The present invention belongs to the technical field of olefin polymerization catalysts, and more specifically, relates to a catalyst component for olefin polymerization, a catalyst containing the catalyst component, and application of the catalyst in olefin polymerization reactions. Background Art

[0002] As is known to all, the ZN catalyst system is generally composed of three parts, including: (1) main catalyst (solid catalyst component), (2) co-catalyst (usually alkyl aluminum compound) and (3) external electron donor compound. Since its advent, it has been continuously developed and has become the main body of the catalyst system for industrial olefin polymerization. The electron donor compound is one of the indispensable components of the catalyst component. It plays a decisive role in important indicators such as polymerization activity, polymer isotacticity, polymer molecular weight and molecular weight distribution. With the development of electron donors, olefin polymerization catalysts are constantly updated.

[0003] As the internal electron donor that promotes the development of ZN catalysts, it has developed from the monobasic acid esters of the third-generation ZN catalysts, such as ethyl benzoate and ethyl p-ethoxybenzoate, to dibasic acid esters, such as di(iso)butyl phthalate with good comprehensive performance of the fourth-generation ZN catalysts. Phthalate compounds (plasticizers) are currently the most commonly used internal electron donors in polypropylene catalysts. Research has found that they can cause serious damage to the growth and development and reproductive system of animals, and may also have similar effects on humans.

[0004] Therefore, there is an urgent need to develop a catalyst that is highly active and does not contain phthalate compounds (plasticizers). Summary of the invention

[0005] The inventors unexpectedly discovered during their research that the use of an internal electron donor containing both a monoether compound and a diether compound can effectively improve the polymerization activity of the catalyst. Based on this discovery, the present invention is proposed.

[0006] A first aspect of the present invention provides a catalyst component for olefin polymerization, the catalyst component comprising a reaction product of the following components: a magnesium source, a titanium source and an internal electron donor, wherein the internal electron donor comprises a monoether compound and a diether compound;

[0007] The molar ratio of the magnesium source calculated as magnesium element, the titanium source calculated as titanium element and the internal electron donor is 1:15-180:0.1-0.9, and the amount of the monoether compound is 0.05-0.9 mole per mole of the diether compound.

[0008] A second aspect of the present invention provides a catalyst for olefin polymerization, the catalyst comprising the reaction product of the following components:

[0009] (i) the above-mentioned catalyst components;

[0010] (ii) at least one alkylaluminum compound; and

[0011] (iii) Optional external electron donor.

[0012] The third aspect of the present invention provides use of the above catalyst in olefin polymerization.

[0013] The invention adopts an internal electron donor containing both monoether compounds and diether compounds, which can effectively improve the polymerization activity of the catalyst and does not contain phthalate compounds.

[0014] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0015] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0016] According to a first aspect of the present invention, there is provided a catalyst component for olefin polymerization, the catalyst component comprising a reaction product of the following components: a magnesium source, a titanium source and an internal electron donor, wherein the internal electron donor comprises a monoether compound and a diether compound.

[0017] In the present invention, the amounts of the magnesium source, the titanium source and the internal electron donor can be conventional amounts in the prior art, for example, the molar ratio of the amount of the magnesium source calculated as magnesium element, the amount of the titanium source calculated as titanium element and the amount of the internal electron donor can be 1:15-180:0.1-0.9. Preferably, the molar ratio of the amount of the magnesium source calculated as magnesium element, the amount of the titanium source calculated as titanium element and the amount of the internal electron donor is 1:18-130:0.15-0.6.

[0018] According to the present invention, based on the total weight of the internal electron donor, the total amount of the monoether compound and the diether compound is 70-100 weight %, preferably 80-100 weight %, more preferably 90-100 weight %, and most preferably 100 weight %.

[0019] According to the present invention, the monoether compound and the diether compound in the internal electron donor can produce a synergistic effect. The amount of the monoether compound can be 0.05-0.9 mole per mole of the diether compound, preferably 0.1-0.7 mole. The two can be better synergistically formulated using the above preferred amounts, thereby obtaining a catalyst with higher polymerization activity.

[0020] In the present invention, the monoether compound may be any monoether compound that can be used as an electron donor in a catalyst for olefin polymerization. Preferably, the monoether compound is selected from at least one of the monoether compounds represented by formula (1):

[0021] R 1 OR 2 Formula (1)

[0022] In formula (1), R 1 and R 2 Each independently selected from C 1 -C 10 Straight or branched alkyl, C 3 -C 20 Cycloalkyl, C 6 -C 20 The aromatic group, C 7 -C 20 Aralkyl or C 7 -C 20 The groups may be optionally bonded to form a ring, and the hydrogen atoms on the alkyl, aryl, alkaryl and aralkyl groups may be optionally substituted by halogen atoms.

[0023] Preferably, the monoether compound is selected from at least one of ethyl ether, tetrahydrofuran, ethylene oxide, methyl butyl ether, butyl ether, ethyl butyl ether, dimethyl ether, chloroethyl n-propyl ether, dipropyl ether, methyl ethyl ether, anisole, 1,2-propylene oxide, and 3-chloro-1,2-propylene oxide; more preferably, the monoether compound is butyl ether.

[0024] According to the present invention, the diether compound may be any diether compound that can be used as an electron donor in a catalyst for olefin polymerization. Preferably, the diether compound is selected from at least one of the diether compounds represented by formula (2):

[0025]

[0026] In formula (2), R I , R II , R III , R IV , RV and R VI are the same or different, each independently selected from hydrogen, halogen atoms, C 1 -C 20 Straight or branched alkyl, C 3 -C 20 Cycloalkyl, C 6 -C 20 The aromatic group, C 7 -C 20 Aralkyl or C 7 -C 20Alkyl, RI-R VIVI The groups of R may be optionally bonded to form a ring; VII and R VIII The same or different, each independently selected from C 1 -C 20 Straight or branched alkyl, C 3 -C 20 Cycloalkyl, C 6 -C 20 The aromatic group, C 7 -C 20 Alkyl or C 7 -C 20 of aralkyl.

[0027] Preferably, the diether compound is 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, 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-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.

[0028] More preferably, the diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane or 9,9-dimethoxymethylfluorene.

[0029] In the present invention, the magnesium source can be various magnesium-containing compounds that can be used as catalysts for olefin polymerization, for example, the magnesium source can be a magnesium halide, an alcoholate of magnesium, a halogenated alcoholate of magnesium, or a magnesium halide adduct carrier, etc. The magnesium halide can be, for example, magnesium chloride and / or magnesium bromide. The alcoholate of magnesium can be, for example, diethoxymagnesium. The halogenated alcoholate of magnesium can be, for example, ethoxymagnesium chloride. The types of the magnesium halide adduct carrier are well known to those skilled in the art, for example, the magnesium halide adduct carriers disclosed in patent documents CN1091748, CN101050245, CN101486722, CN102796132B, CN102796129B and CN102796128B, and the relevant contents disclosed in these patent documents are all introduced into the present invention as a reference.

[0030] According to the present invention, the titanium source can be a conventional choice in the art, for example, the titanium source can be a titanium source having a general formula of Ti(OR′) 3-a Z a and / or Ti(OR′) 4-b Z b A titanium compound wherein R′ is C 1 -C 20 alkyl, Z is F, Cl, Br or I, a is an integer of 1 to 3, and b is an integer of 1 to 4. Preferably, the titanium source is one or more of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, tributoxytitanium chloride, dibutoxytitanium dichloride, butoxytitanium trichloride, triethoxytitanium chloride, diethoxytitanium dichloride, ethoxytitanium trichloride and titanium trichloride.

[0031] The catalyst component for olefin polymerization of the present invention can be prepared by conventional methods. For example, the preparation method of the catalyst component includes: contacting a magnesium source with a titanium source, and adding an internal electron donor in one or more time periods before, during and after the contact reaction of the magnesium source with the titanium source. The components of the internal electron donor can be added separately or simultaneously. The internal electron donor contains monoether compounds and diether compounds.

[0032] Specifically, the reaction of the magnesium source and the titanium source can be carried out in the same manner as in the prior art, for example, the titanium source can be cooled to below 0°C (preferably -5 to -25°C), then the magnesium source is added, and the mixture is stirred and mixed at this temperature for 10-60 minutes, and then the temperature is raised to the reaction temperature (i.e., about 60-130°C), and maintained at the reaction temperature for 0.5-10 hours. In the method for preparing the catalyst component for olefin polymerization, the internal electron donor is added in one or more time periods before, during and after the reaction of the magnesium source and the titanium source. The time period before the reaction of the magnesium source and the titanium source refers to the time period after the magnesium source is added to the reactor and before the temperature is raised to the reaction temperature.

[0033] According to a second aspect of the present invention, the present invention provides a catalyst for olefin polymerization, the catalyst comprising a reaction product of the following components:

[0034] (i) the above-mentioned catalyst components;

[0035] (ii) at least one alkylaluminum compound; and

[0036] (iii) Optional external electron donor.

[0037] In the present invention, the alkyl aluminum compound may be any of various alkyl aluminum compounds commonly used in the art. For example, the general formula of the alkyl aluminum may be AlR 16 R 16 ′R 16 ″, where R 16 , R 16 ′ and R 16 ″ are each independently C 1 -C 8 wherein one or both of the groups are optionally halogen, and the hydrogen on the alkyl group is optionally substituted by a halogen atom.

[0038] The C 1 -C 8 Specific examples of the alkyl group may include, but are not limited to, methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl, n-octyl, and the halogen may be fluorine, chlorine, bromine, or iodine.

[0039] Specifically, the alkylaluminum compound can be selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum monochloride, diisobutylaluminum monochloride, di-n-butylaluminum monochloride, di-n-hexylaluminum monochloride, monoethylaluminum dichloride, monoisobutylaluminum dichloride, mono-n-butylaluminum dichloride and mono-n-hexylaluminum dichloride.

[0040] According to the present invention, the amount of the alkyl aluminum compound can be the conventional amount in the art. The molar ratio of aluminum in the alkyl aluminum compound to titanium in the catalyst component can be 1-2000:1, preferably 20-500:1, more preferably 30-200:1.

[0041] In the present invention, the external electron donor can be any of various external electron donors commonly used in the art. For example, the external electron donor can be selected from at least one of carboxylic acids, carboxylic anhydrides, carboxylic esters, ketones, ethers, alcohols, lactones, organophosphorus compounds and organosilicon compounds.

[0042] Preferably, the external electron donor is selected from a group containing at least one Si-OR 19 bond, and the general formula is (R 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, where R 17 , R 18 and R 19 C 1 -C 18 The hydrocarbon group optionally contains heteroatoms, x and y are each independently an integer of 0-2, z is an integer of 1-3, and the sum of x, y, and z is 4. 17 , R 18 Preferably C 3 -C 10 The alkyl or cycloalkyl group may contain heteroatoms; R 19 Preferably C 1 -C 10 The alkyl group may contain a heteroatom.

[0043] Specifically, the external electron donor can be selected from at least one of cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl-tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane and (1,1,1-, trifluoro-2-propyl)-methyldimethoxysilane.

[0044] According to the present invention, the amount of the external electron donor can be a conventional amount in the art. The molar ratio of the external electron donor to the aluminum in the alkyl aluminum compound can be 1:2-200, preferably 1:2.5-100.

[0045] According to the present invention, in the preparation process of the catalyst for olefin polymerization, the alkyl aluminum compound and the optional external electron donor can be mixed with the catalyst components for olefin polymerization separately and then reacted, or the alkyl aluminum compound and the optional external electron donor can be mixed first and then mixed with the catalyst components for olefin polymerization and reacted.

[0046] The third aspect of the present invention provides use of the above catalyst in olefin polymerization.

[0047] When the catalyst of the present invention is used for olefin polymerization, the catalyst components, alkyl aluminum compound, and optional external electron donor can be added to the polymerization reactor separately, or mixed and added to the polymerization reactor, or the olefin can be prepolymerized by a prepolymerization method known in the industry and then added to the polymerization reactor.

[0048] In the present invention, the specific type of olefin, the polymerization method and conditions of olefin can be conventionally selected according to the prior art.

[0049] The catalyst of the present invention is particularly suitable for 2 =CHR 1 Homopolymerization and copolymerization of olefins, wherein R 1 It is hydrogen, C 1 -C 6 Alkyl or C 6 -C 12 The aromatic group.

[0050] According to the present invention, the polymerization reaction of the olefin can be carried out according to the existing method, specifically, under the protection of an inert gas, in a liquid phase monomer or an inert solvent containing a polymerizable monomer, or in a gas phase, or by a combined polymerization process in a gas-liquid phase. The temperature of the polymerization reaction can generally be 0-150°C, preferably 60-90°C. The pressure of the polymerization reaction can be normal pressure or higher, for example, 0.01-10MPa, preferably 0.01-5MPa, more preferably 0.1-4Mpa, and the pressure of the present invention refers to the gauge pressure. In the polymerization process, hydrogen can be used as a polymer molecular weight regulator and added to the reaction system to adjust the molecular weight and melt index of the polymer. In addition, in the polymerization process of the olefin, the type and amount of the inert gas and solvent are well known to those skilled in the art and will not be repeated here.

[0051] Parameters not limited in the present invention are all conventional technical means in the art.

[0052] The present invention will be further described below with reference to the following examples, but is not limited to these examples.

[0053] Examples 1 to 5 are used to illustrate the catalyst component and catalyst for olefin polymerization and application of the present invention.

[0054] Example 1

[0055] (1) Preparation of catalyst components

[0056] In a 300mL glass reaction bottle, add 80mL of titanium tetrachloride and cool to -20°C, add 37mmol of a magnesium halide carrier (prepared according to the method disclosed in Example 1 of CN1267508C) in terms of magnesium element, then heat to 110°C, and add 1.8mmol of butyl ether and 7.8mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane during the heating process. After maintaining at 110°C for 30min, filter out the liquid, wash with titanium tetrachloride, then wash with hexane, and vacuum dry to obtain the catalyst component Cat-1 for olefin polymerization.

[0057] (2) Propylene liquid phase bulk polymerization

[0058] The bulk polymerization of propylene in liquid phase was carried out in a 5L stainless steel autoclave. Under nitrogen protection, 1mL of triethylaluminum hexane solution (concentration of 0.5mmol / mL), 0.1mL of cyclohexylmethyldimethoxysilane (CHMMS) hexane solution (concentration of 0.1mmol / mL) and 7mg of the above-mentioned catalyst component Cat-1 for olefin polymerization were added to the reactor in sequence. The autoclave was closed, and 6.5L of hydrogen (standard volume) and 2.3L of liquid propylene were added. After heating to 70°C and reacting for 2 hours, the temperature was lowered, the pressure was released, and the material was discharged. The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0059] Example 2

[0060] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was not added during the heating process, and the amounts of butyl ether and 9,9-dimethoxymethylfluorene added were 1.2 mmol and 9 mmol, respectively, to obtain a catalyst component Cat-2 for olefin polymerization.

[0061] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0062] Example 3

[0063] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that the amounts of butyl ether and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane added during the heating process were 3 mmol and 8 mmol, respectively, to obtain catalyst component Cat-3 for olefin polymerization.

[0064] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0065] Example 4

[0066] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that the amounts of butyl ether and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane added during the heating process were 4.7 mmol and 7 mmol, respectively, to obtain catalyst component Cat-4 for olefin polymerization.

[0067] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0068] Example 5

[0069] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that the amounts of methyl butyl ether and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane added during the heating process were 1 mmol and 8.5 mmol, respectively, to obtain catalyst component Cat-5 for olefin polymerization.

[0070] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0071] Comparative Example 1

[0072] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that in the preparation process of the catalyst component, no butyl ether was added, and only 9.6 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was added to obtain the catalyst component DCat-1 for olefin polymerization; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0073] Comparative Example 2

[0074] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that in the preparation process of the catalyst component, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was not added, and only 9.6 mmol of butyl ether was added to obtain the catalyst component DCat-2 for olefin polymerization; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0075] Table 1

[0076]

[0077] It can be seen from Table 1 that when the internal electron donor contains both a monoether compound and a diether compound, the polymerization activity of the catalyst can be effectively improved, and the catalyst component of the present invention does not contain phthalate compounds (plasticizers).

[0078] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A catalyst component for olefin polymerization, characterized in that The catalyst component comprises a reaction product of the following components: a magnesium source, a titanium source and an internal electron donor, wherein the internal electron donor is a combination of a monoether compound and a diether compound; The molar ratio of the magnesium source calculated as magnesium element, the titanium source calculated as titanium element and the internal electron donor is 1:15-180:0.1-0.9, and the amount of the monoether compound is 0.05-0.9 mole per mole of the diether compound; The monoether compound is selected from at least one of the monoether compounds represented by formula (1): R1OR2 formula (1) In formula (1), R1 and R2 are each independently selected from C1-C 10 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Arylalkyl or C7-C 20 The alkylaryl groups may be optionally bonded to form a ring, and the hydrogen atoms on the alkyl, aryl, alkylaryl and aralkyl groups may be optionally replaced by halogen atoms; The diether compound is selected from at least one of the diether compounds represented by formula (2): In formula (2), R Ⅰ , R Ⅱ , R Ⅲ , R Ⅳ , R Ⅴ and R Ⅵ the same or different, each independently selected from hydrogen, halogen atoms, C1-C 20 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Arylalkyl or C7-C 20 The alkylaryl group, R Ⅰ -R Ⅵ The groups of R may be optionally bonded to form a ring; Ⅶ and R Ⅷ The same or different, each independently selected from C1-C 20 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Alkyl or C7-C 20 of aralkyl.

2. The catalyst component for olefin polymerization according to claim 1, wherein The molar ratio of the magnesium source calculated as magnesium element, the titanium source calculated as titanium element and the internal electron donor is 1:18-130:0.15-0.6, and the amount of the monoether compound is 0.1-0.7 mole per mole of the diether compound.

3. The catalyst component for olefin polymerization according to claim 1, wherein The monoether compound is selected from at least one of ethyl ether, methyl butyl ether, butyl ether, ethyl butyl ether, dimethyl ether, chloroethyl n-propyl ether, dipropyl ether, methyl ethyl ether and anisole.

4. The catalyst component for olefin polymerization according to claim 3, wherein The monoether compound is butyl ether.

5. The catalyst component 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-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, 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-(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, 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 at least one of 9,9-dimethoxymethylfluorene.

6. The catalyst component for olefin polymerization according to claim 5, wherein The diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane or 9,9-dimethoxymethylfluorene.

7. The catalyst component for olefin polymerization according to claim 1, wherein The magnesium source is selected from magnesium halide, magnesium alcoholate, magnesium haloalcoholate or magnesium halide adduct carrier; The titanium source is selected from the general formula Ti(OR′) 3-a Z a and / or Ti(OR′) 4-b Z b A titanium compound wherein R′ is C1-C 20 wherein the alkyl group is an alkyl group, Z is F, Cl, Br or I, a is an integer of 1-3, and b is an integer of 1-4.

8. The catalyst component for olefin polymerization according to claim 7, wherein The magnesium source is selected from magnesium chloride, magnesium bromide, diethoxymagnesium or ethoxymagnesium chloride carrier.

9. The catalyst component for olefin polymerization according to claim 7, wherein The titanium source is selected from one or more of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, tributoxytitanium chloride, dibutoxytitanium dichloride, butoxytitanium trichloride, triethoxytitanium chloride, diethoxytitanium dichloride, ethoxytitanium trichloride and titanium trichloride.

10. A catalyst for olefin polymerization, characterized in that The catalyst comprises the reaction product of: (i) the catalyst component according to any one of claims 1 to 9; (ii) at least one alkylaluminum compound; and (iii) Optional external electron donor.

11. The catalyst for olefin polymerization according to claim 10, wherein The general formula of the alkyl aluminum compound is AlR 16 R 16 ′R 16 ″, where R 16 , R 16 ′ and R 16 "each independently represents a C1-C8 alkyl group, and one or two of the groups are optionally halogen, and the hydrogen on the alkyl group is optionally replaced by a halogen atom; The molar ratio of aluminum in the alkyl aluminum compound to titanium in the catalyst component is 1-2000:

1.

12. The catalyst for olefin polymerization according to claim 11, wherein The alkylaluminum compound is selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum monochloride, diisobutylaluminum monochloride, di-n-butylaluminum monochloride, di-n-hexylaluminum monochloride, monoethylaluminum dichloride, monoisobutylaluminum dichloride, mono-n-butylaluminum dichloride and mono-n-hexylaluminum dichloride.

13. The catalyst for olefin polymerization according to claim 11, wherein The molar ratio of aluminum in the alkyl aluminum compound to titanium in the catalyst component is 20-500:

1.

14. The catalyst for olefin polymerization according to claim 13, wherein The molar ratio of aluminum in the alkyl aluminum compound to titanium in the catalyst component is 30-200:

1.

15. The catalyst for olefin polymerization according to claim 10, wherein The external electron donor is selected from a group containing at least one Si-OR 19 bond, and the general formula is (R 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, where R 17 , R 18 and R 19 C1-C 18 A hydrocarbon group optionally containing heteroatoms, x and y are each independently an integer of 0-2, z is an integer of 1-3, and the sum of x, y, and z is 4; The molar ratio of the external electron donor to the aluminum in the alkyl aluminum compound is 1:2-200.

16. The catalyst for olefin polymerization according to claim 15, wherein R 17 , R 18 C3-C 10 The alkyl or cycloalkyl group may contain heteroatoms; R 19 C1-C 10 The alkyl group may contain a heteroatom.

17. The catalyst for olefin polymerization according to claim 16, wherein The external electron donor is selected from at least one of cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl-tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane and (1,1,1-trifluoro-2-propyl)-methyldimethoxysilane.

18. The catalyst for olefin polymerization according to claim 15, wherein The molar ratio of the external electron donor to the aluminum in the alkyl aluminum compound is 1:2.5-100.

19. Use of the catalyst according to any one of claims 10 to 18 in olefin polymerization.

Images