Solid catalyst component for olefin polymerization as well as preparation method, catalyst and application of solid catalyst component

Abstract

The invention belongs to the technical field of olefin polymerization, and relates to a solid catalyst component for olefin polymerization, and a preparation method, a catalyst and application thereof. The catalyst component comprises reaction products of the following components: a magnesium source, a titanium source and an internal electron donor, wherein the internal electron donor comprises a succinic acid monoester compound. The preparation method comprises the following steps: carrying out a contact reaction on a magnesium source and a titanium source, adding an internal electron donor in one or more time periods before, during and after the contact reaction of the magnesium source and the titanium source, then carrying out one or more times of treatment by adopting the titanium source, and then washing by using an inert solvent to obtain the solid catalyst component. According to the invention, the succinic acid monoester compound is used as an internal electron donor, and the catalyst has significantly low stereospecificity, good hydrogen regulation sensitivity and polymerization activity, and can be used for preparing low-isotacticity polypropylene.

Description

Technical Field

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

[0002] Low isotactic polypropylene has good application prospects due to its good adhesion, excellent hydrophobicity, chemical resistance, electrical insulation, bonding and good compatibility. Low isotactic polypropylene has different forms and uses according to its isotacticity and molecular weight. Products with lower isotacticity and smaller molecular weight are usually amorphous and can be used in hot melt adhesives, improved asphalt waterproofing materials, building sealants and rubber and plastic material performance improvers. Products with higher isotacticity and larger molecular weight can be used as thermoplastic elastomers for films, filaments, fibers, sheets and other uses requiring elasticity.

[0003] The production of low isotactic polypropylene in the early stage was separated from the polypropylene product, which was complicated and costly. At present, existing patents disclose a catalyst preparation method for directly synthesizing low isotactic polypropylene, such as WO1988009348 discloses a catalyst preparation method, wherein chlorine or hydrogen chloride reacts with an alkyl magnesium compound to form a carrier, and then reacts with titanium tetrachloride to prepare a catalyst, wherein the catalyst activity is about 3kgPP / gcat, and the isotacticity of the obtained polypropylene is about 30%. CN1124740A discloses a catalyst preparation method, wherein a suspension of magnesium chloride alcohol solution and silicon dioxide is treated with alkyl aluminum to obtain a carrier, and then reacted with titanium tetrachloride to obtain a catalyst, and the catalyst is used for propylene polymerization, wherein the catalyst activity is about 1-3kgPP / gcat, and the isotacticity of the obtained polypropylene is about 30%. CN1262283A discloses a catalyst preparation method, wherein a suspension of magnesium halide alcohol solution and clay is treated with alkyl aluminum to obtain a carrier, and then reacted with titanium tetrachloride to obtain a catalyst, and the catalyst is used for propylene polymerization, wherein the activity is about 2-3kgPP / gcat, and the isotacticity of the obtained polypropylene is about 25-40%. CN1693316A discloses a method for preparing a catalyst, wherein magnesium chloride and aluminum chloride are co-grinded and then reacted with titanium tetrachloride to obtain a catalyst, and the catalyst is used for propylene polymerization, and the activity is about 6×10 3 -1.0×10 4 gPP / gTi, the isotacticity of the obtained polypropylene is about 25-40%. The catalyst polymerization activity provided in the above patents is relatively low, and the preparation process is relatively complicated. The isotacticity of the prepared polymer is mostly below 40%, and the mechanical and thermal properties are poor, which is difficult to meet the application requirements of medium isotacticity and large molecular weight.

[0004] If a catalyst with low stereospecificity and high polymerization activity can be developed, low isotactic polypropylene can be directly polymerized, eliminating the complicated separation process and having better industrial prospects than the existing technology. The polymerization product can be used as a thermoplastic elastomer for films, filaments, fibers, sheets and other uses requiring elasticity. Summary of the invention

[0005] The inventors unexpectedly discovered during their research that when a succinic acid monoester compound is used as an internal electron donor, the catalyst has significantly low stereospecificity, good hydrogen sensitivity and polymerization activity, and can be used to prepare low-isotactic polypropylene. Based on this discovery, the present invention is proposed.

[0006] In order to achieve the purpose of the present invention, the first aspect of the present invention provides a catalyst component for olefin polymerization, which 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 succinic acid monoester compound.

[0007] The second aspect of the present invention provides a method for preparing the solid catalyst component for olefin polymerization, comprising the following steps:

[0008] A magnesium source is contacted with a titanium source for reaction, and an internal electron donor is added in one or more time periods before, during and after the contact reaction of the magnesium source and the titanium source, and then the titanium source is treated once or multiple times, and then washed with an inert solvent to obtain the solid catalyst component.

[0009] A third aspect of the present invention provides a catalyst for olefin polymerization, the catalyst comprising the reaction product of the following components:

[0010] (i) the catalyst component;

[0011] (ii) at least one alkylaluminum compound; and

[0012] (iii) Optional external electron donor.

[0013] The fourth aspect of the present invention provides use of the catalyst for olefin polymerization in olefin polymerization reactions.

[0014] The present invention adopts succinic acid monoester compounds as internal electron donors, and the catalyst has significantly low stereospecificity, good hydrogen adjustment sensitivity and polymerization activity, and can be used for preparing low-isotactic polypropylene.

[0015] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0016] 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.

[0017] In order to achieve the purpose of the present invention, the first aspect of the present invention provides a catalyst component for olefin polymerization, which 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 succinic acid monoester compound.

[0018] According to the present invention, based on the total weight of the internal electron donor, the total amount of the succinic acid monoester compound is 80-100 weight %, preferably 90-100 weight %.

[0019] According to the present invention, based on the total weight of the catalyst component, the total weight of the internal electron donor in the catalyst component is 5-25 wt%.

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

[0021]

[0022] In formula (1), R1 is C1-C 20 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Alkyl or C7-C 20 R2 to R5 are each independently selected from hydrogen, C1-C 20 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Alkyl or C7-C 20 The aralkyl group may contain a heteroatom, and R2 to R5 attached to the same carbon atom may be bonded to form a ring.

[0023] Preferably, R1 is C1-C 10 Straight chain alkyl, C3-C 10 Branched alkyl, C3-C 10 Cycloalkyl, C6-C 10 Aryl, C7-C 10 Alkyl or C7-C 10 R2 to R5 are each independently selected from hydrogen, C1-C 10 Straight chain alkyl, C3-C10 Branched alkyl, C3-C 10 Cycloalkyl, C6-C 10 Aryl, C7-C 10 Alkyl or C7-C 10 The aralkyl group may contain a heteroatom, and R2 to R5 bonded to the same carbon atom may be bonded to form a ring.

[0024] Further preferably, the succinic acid monoester compound is selected from at least one of 4-methoxy-4-oxobutyric acid, 4-ethoxy-4-oxobutyric acid, 4-propoxy-4-oxobutyric acid, 4-tert-butoxy-4-oxobutyric acid, and 4-benzyl-4-oxobutyric acid; more preferably, the succinic acid monoester compound is 4-tert-butoxy-4-oxobutyric acid.

[0025] In the present invention, the magnesium source can be various magnesium-containing compounds that can be used for olefin polymerization catalysts, 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.

[0026] 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 C1-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.

[0027] In the present invention, the amounts of magnesium source, titanium source and internal electron donor can be conventional amounts in the prior art, for example, the molar ratio of the amount of magnesium source calculated as magnesium element, the amount of titanium source calculated as titanium element and the amount of internal electron donor can be 1:10-180:0.1-1. Preferably, the molar ratio of the amount of magnesium source calculated as magnesium element, the amount of titanium source calculated as titanium element and the amount of internal electron donor is 1:15-150:0.2-0.9.

[0028] The second aspect of the present invention provides a method for preparing the solid catalyst component for olefin polymerization, comprising the following steps:

[0029] A magnesium source is contacted with a titanium source for reaction, and an internal electron donor is added in one or more time periods before, during and after the contact reaction of the magnesium source and the titanium source, and then the titanium source is treated once or multiple times, and then washed with an inert solvent to obtain the solid catalyst component.

[0030] Preferably, the reaction of the magnesium source and the titanium source can be carried out in the following manner: the titanium source is cooled to below 0°C (preferably -5 to -25°C), and then the magnesium source is added and stirred and mixed at this temperature, preferably for 10-90 minutes, and then the temperature is gradually raised to the reaction temperature (i.e., about 70-130°C), and maintained at the reaction temperature for 0.2-10 hours, preferably 0.5-6 hours. In the preparation method of the catalyst component for olefin polymerization, the internal electron donor is added in one or more time periods before, during or 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.

[0031] A third aspect of the present invention provides a catalyst for olefin polymerization, the catalyst comprising the reaction product of the following components:

[0032] (i) the catalyst component;

[0033] (ii) at least one alkylaluminum compound; and

[0034] (iii) Optional external electron donor.

[0035] 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, where, R 16 , R 16 ′ and R 16 "each independently represents a C1-C8 alkyl group or a halogen group, but they are not halogen groups at the same time, and the hydrogen atoms on the alkyl group are optionally replaced by halogen atoms.

[0036] Specific examples of the C1-C8 alkyl group may include, but are not limited to, methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl, and n-octyl, and the halogen may include fluorine, chlorine, bromine, and iodine.

[0037] 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.

[0038] 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 50-800:1, more preferably 100-500:1.

[0039] In the present invention, the external electron donor can be any external electron donor commonly used in the art. For example, the external electron donor can be selected from carboxylic acids, carboxylic anhydrides, carboxylates, ketones, ethers, alcohols, lactones, organophosphorus compounds and organosilicon compounds.

[0040] 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 C1-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 C3-C 10 The alkyl or cycloalkyl group may contain heteroatoms; R 19 Preferably C1-C 10 The alkyl group may contain heteroatoms.

[0041] 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.

[0042] 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 1:5-500, preferably 1:20-200.

[0043] 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.

[0044] The fourth aspect of the present invention provides use of the catalyst for olefin polymerization in olefin polymerization reactions.

[0045] 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.

[0046] 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.

[0047] The catalyst of the present invention is particularly suitable for the general formula CH2=CHR 1 Homopolymerization and copolymerization of olefins, wherein R 1 is hydrogen, C1-C6 alkyl or C6-C 12 The aromatic group.

[0048] 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.

[0049] Parameters not limited in the present invention are all conventional technical means in the art.

[0050] The present invention will be further described below in conjunction with embodiments, but the scope of the present invention is not limited to these embodiments.

[0051] The polymer melt index in the present invention is measured according to GB3682-2000 at 230°C and a load of 2.16 kg.

[0052] The isotactic index of the polymer in the present invention is determined by the heptane extraction method (heptane boiling extraction for 6 hours), that is, 2 g of a dry polymer sample is taken, placed in an extractor and extracted with boiling heptane for 6 hours, then the residue is dried to constant weight, and the ratio of the obtained polymer weight (g) to 2 is the isotactic index.

[0053] Examples 1 to 4 are used to illustrate the catalyst component and catalyst for olefin polymerization and their application according to 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 33mmol 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 8.8mmol of 4-tert-butoxy-4-oxobutanoic acid 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, 2mL of triethylaluminum hexane solution (concentration of 0.5mmol / mL), 0.4mL of cyclohexylmethyldimethoxysilane (CHMMS) hexane solution (concentration of 0.1mmol / mL) and 9mg of the above-mentioned catalyst component Cat-1 for olefin polymerization were added to the reactor in sequence. The autoclave was closed, and 1.5NL of hydrogen and 2.3L of liquid propylene were added. The temperature was raised to 70°C, and after reacting for 1 hour, 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 the amount of 4-tert-butoxy-4-oxobutyric acid added during the heating process was 9.2 mmol, 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 amount of 4-tert-butoxy-4-oxobutyric acid added during the heating process was 7.6 mmol, to obtain a 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 8 mmol of 4-ethoxy-4-oxobutyric acid was added during the heating process to obtain a 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] Comparative Example 1

[0069] The commercial DQC catalyst (produced by Beijing Aoda Branch) was used to carry out liquid phase bulk polymerization of propylene according to the method of Example 1; the obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0070] Table 1

[0071]

[0072] As can be seen from Table 1, compared with conventional commercial catalysts, the catalyst of the present invention has high hydrogen adjustment sensitivity and low stereospecificity, and the prepared polymer has a high melt index and a low isotactic index, which can meet the application requirements of low isotactic polypropylene. Compared with low isotactic catalysts, the catalyst of the present invention has high polymerization activity, and the preparation method is simple, and the industrialization prospect is good.

[0073] 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.

[0074] The endpoints and any values ​​of the ranges disclosed in this article 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 each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

Claims

1. A catalyst component for olefin polymerization, characterized in that The catalyst component comprises the reaction product of the following components: a magnesium source, a titanium source and an internal electron donor, wherein the internal electron donor comprises a succinic acid monoester compound.

2. The catalyst component for olefin polymerization according to claim 1, wherein Based on the total weight of the internal electron donor, the total amount of the succinic acid monoester compound is 80-100 weight %, preferably 90-100 weight %.

3. The catalyst component for olefin polymerization according to claim 1, wherein Based on the total weight of the catalyst component, the total weight of the internal electron donor in the catalyst component is 5-25 weight %.

4. The catalyst component for olefin polymerization according to claim 1, wherein The succinic acid monoester compound is selected from at least one of the succinic acid monoester compounds shown in formula (1), In formula (1), R1 is C1-C 20 Straight chain alkyl, C3-C 20 Branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Alkyl or C7-C 20 R2 to R5 are each independently selected from hydrogen, C1-C 20 Straight chain alkyl, C3-C 20 Branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Alkyl or C7-C 20 The aralkyl group may contain a heteroatom, and R2 to R5 attached to the same carbon atom may be bonded to form a ring; Preferably, R1 is C1-C 10 Straight chain alkyl, C3-C 10 Branched alkyl, C3-C 10 Cycloalkyl, C6-C 10 Aryl, C7-C 10 Alkyl or C7-C 10 R2 to R5 are each independently selected from hydrogen, C1-C 10 Straight chain alkyl, C3-C 10 Branched alkyl, C3-C 10 Cycloalkyl, C6-C 10 Aryl, C7-C 10 Alkyl or C7-C 10 The aralkyl group may contain a heteroatom, and R2 to R5 attached to the same carbon atom may be bonded to form a ring; Further preferably, the succinic acid monoester compound is at least one selected from 4-methoxy-4-oxobutyric acid, 4-ethoxy-4-oxobutyric acid, 4-propoxy-4-oxobutyric acid, 4-tert-butoxy-4-oxobutyric acid and 4-benzyl-4-oxobutyric acid; More preferably, the succinic acid monoester compound is 4-tert-butoxy-4-oxobutanoic acid.

5. The catalyst component for olefin polymerization according to claim 1, wherein The magnesium source is at least one of a magnesium halide, a magnesium alcoholate or a halogenated alcoholate and a magnesium halide adduct carrier; preferably, the magnesium source is at least one of magnesium chloride, magnesium bromide, diethoxymagnesium and ethoxymagnesium chloride; The titanium source is of the general formula Ti(OR′) 3-a Z a and Ti(OR′) 4-b Z b At least one of the compounds shown, wherein R′ is C1-C 20 The alkyl group is preferably C1-C 12 An alkyl group, more preferably a C1-C6 alkyl group, Z is a halogen, a is an integer of 1-3, and b is an integer of 1-4; Preferably, the titanium source is at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, tributoxytitanium chloride, dibutoxytitanium dichloride, butoxytitanium trichloride, triethoxytitanium chloride, diethoxytitanium dichloride, ethoxytitanium trichloride and titanium trichloride.

6. 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 1:10-180:0.1-1, preferably 1:15-150:0.2-0.

9.

7. The method for preparing a catalyst component for olefin polymerization according to any one of claims 1 to 6, characterized in that: The steps include: A magnesium source is contacted with a titanium source for reaction, and an internal electron donor is added in one or more time periods before, during and after the contact reaction of the magnesium source and the titanium source, and then the titanium source is treated once or multiple times, and then washed with an inert solvent to obtain the solid catalyst component.

8. 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 6; (ii) at least one alkylaluminum compound; and (iii) Optional external electron donor.

9. The catalyst for olefin polymerization according to claim 8, wherein The alkyl aluminum compound is selected from the general formula AlR 16 R 16 ′R 16 At least one of the compounds shown in ″, wherein R 16 , R 16 ′ and R 16 "each independently represents a C1-C8 alkyl group or a halogen group, and they are not halogen groups at the same time, and the hydrogen atoms on the alkyl group are optionally replaced by halogen atoms; Preferably, the alkylaluminum compound is selected from at least one 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.

10. The catalyst for olefin polymerization according to claim 8, wherein The external electron donor is selected from at least one of carboxylic acid, carboxylic anhydride, carboxylic ester, ketone, ether, alcohol, lactone, organophosphorus compound and organosilicon compound; preferably, the external electron donor is selected from 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, R 17 , R 18 Preferably C3-C 10 The alkyl or cycloalkyl group may contain heteroatoms; R 19 Preferably C1-C 10 An alkyl group optionally containing heteroatoms; Preferably, 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.

11. The catalyst for olefin polymerization according to claim 8, wherein The molar ratio of the solid catalyst component calculated as titanium element to the alkyl aluminum compound calculated as aluminum element is 1:1-2000, preferably 1:50-800, more preferably 1:100-500; The molar ratio of the external electron donor to the alkyl aluminum compound calculated as aluminum element is 1:5-500, preferably 1:20-200.

12. Use of the catalyst for olefin polymerization according to any one of claims 8 to 11 in olefin polymerization reactions.

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