A solid catalyst component for olefin polymerization, its preparation method, catalyst, and application.

Abstract

This invention belongs to the field of olefin polymerization technology, and relates to a solid catalyst component for olefin polymerization, its preparation method, the catalyst, and its application. 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 includes a succinic acid monoester compound. The process includes the following steps: contacting a magnesium source with a titanium source, adding the internal electron donor before, during, and after the contacting reaction, then treating with the titanium source once or multiple times, and finally washing with an inert solvent to obtain the solid catalyst component. This invention uses a succinic acid monoester compound as the internal electron donor, and the catalyst exhibits significantly low stereotacticity, good hydrogen sensitivity, and polymerization activity, and can be used to prepare low-isotactic polypropylene.

Description

Technical Field

[0001] This invention belongs to the field of olefin polymerization technology, and more specifically, relates to a solid catalyst component for olefin polymerization, a method for preparing the solid catalyst component, a catalyst comprising the solid catalyst component, and the application of the catalyst in olefin polymerization reactions. Background Technology

[0002] Low-isotactic polypropylene (LOP) has promising applications due to its excellent adhesion, hydrophobicity, chemical resistance, electrical insulation, bonding properties, and good compatibility. LOP exhibits different forms and uses depending on its isotacticity and molecular weight. Lower isotactic and lower molecular weight products are typically amorphous and can be used in hot melt adhesives, asphalt waterproofing materials, building sealants, and as performance modifiers for rubber and plastic materials. Higher isotactic and higher molecular weight products can be used as thermoplastic elastomers in films, filaments, fibers, sheets, and other applications requiring elasticity.

[0003] Early production of low-isotactic polypropylene involved separation from polypropylene products, a complex and costly process. Currently, several patents disclose methods for preparing catalysts for the direct synthesis of low-isotactic polypropylene. For example, WO1988009348 discloses a method for preparing a catalyst by reacting chlorine or hydrogen chloride with an alkyl magnesium compound to form a support, which is then reacted with titanium tetrachloride to obtain the catalyst. The catalyst activity is approximately 3 kg PP / gcat, yielding polypropylene with an isotacticity of approximately 30%. CN1124740A discloses a method for preparing a catalyst by treating a magnesium chloride alcohol solution and a silica suspension with alkyl aluminum to obtain a support, which is then reacted with titanium tetrachloride to obtain the catalyst. This catalyst is used for propylene polymerization, with an activity of approximately 1-3 kg PP / gcat, yielding polypropylene with an isotacticity of approximately 30%. CN1262283A discloses a method for preparing a catalyst by treating a magnesium halide alcohol solution and a clay suspension with alkyl aluminum to obtain a support, which is then reacted with titanium tetrachloride to obtain the catalyst. This catalyst is used for propylene polymerization, with an activity of approximately 2-3 kg PP / gcat, yielding polypropylene with an isotacticity of approximately 25-40%. CN1693316A discloses a method for preparing a catalyst, which involves co-grinding magnesium chloride and aluminum chloride, followed by reacting them with titanium tetrachloride. This catalyst is used for propylene polymerization and exhibits an activity of approximately 6 × 10⁻⁶. 3 -1.0×10 4 The isotacticity of polypropylene obtained by using gPP / gTi is approximately 25-40%. The catalysts provided in the above patents have relatively low polymerization activity and complex preparation processes, resulting in polymers with isotacticity mostly below 40%, exhibiting poor mechanical and thermal properties, making them unsuitable for applications requiring medium isotacticity and larger molecular weights.

[0004] If a catalyst with low stereotactic orientation and high polymerization activity can be developed, low isotactic polypropylene can be directly polymerized, eliminating the need for complex separation processes and showing greater promise for industrialization compared to existing technologies. The polymerized product can be used as a thermoplastic elastomer in films, filaments, fibers, sheets, and other applications requiring elasticity. Summary of the Invention

[0005] During their research, the inventors unexpectedly discovered that when succinic acid monoester compounds are used as internal electron donors, the catalyst exhibits significantly lower stereoregulation, good hydrogen sensitivity, and polymerization activity, making it suitable for preparing low-isotactic polypropylene. Based on this discovery, this invention is proposed.

[0006] To achieve the objectives of the present invention, a first aspect of the present invention provides a catalyst composition for olefin polymerization, the catalyst composition comprising the 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.

[0007] A 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 and a titanium source are brought into contact and reacted. An internal electron donor is added before, during, and after the contact and reaction of the magnesium source and the titanium source. The mixture is then treated once or multiple times with a titanium source and 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 components described herein;

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

[0012] (iii) An optional external electron donor.

[0013] A fourth aspect of the invention provides the application of the catalyst described above for olefin polymerization in olefin polymerization reactions.

[0014] This invention uses succinic acid monoester compounds as internal electron donors. The catalyst has significantly low stereotacticity, good hydrogen sensitivity and polymerization activity, and can be used to prepare low isotactic polypropylene.

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

[0016] 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.

[0017] To achieve the objectives of the present invention, a first aspect of the present invention provides a catalyst composition for olefin polymerization, the catalyst composition comprising the 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.

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

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

[0020] In this invention, the succinic acid monoester compound can be any succinic acid monoester compound capable of serving as an internal electron donor in a catalyst for olefin polymerization. Preferably, the succinic acid monoester compound is selected from at least one of the compounds shown in formula (1):

[0021]

[0022] In equation (1), R1 is C1-C 20 Straight-chain or branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 alkylaryl or C7-C 20 The aralkyl group, R2 to R5, are each independently selected from hydrogen, C1-C6. 20 Straight-chain or branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 alkylaryl or C7-C 20 The aralkyl group, optionally containing heteroatoms, and R2 to R5 attached to the same carbon atom can be bonded to form a ring.

[0023] Preferably, R1 is C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl groups, C3-C 10 cycloalkyl, C6-C 10 aryl, C7-C 10 alkylaryl or C7-C 10 The aralkyl group, R2 to R5, are each independently selected from hydrogen, C1-C6. 10 Straight-chain alkyl, C3-C10 Branched alkyl groups, C3-C 10 cycloalkyl, C6-C 10 aryl, C7-C 10 alkylaryl or C7-C 10 The aralkyl group, optionally containing heteroatoms, and R2 to R5 optionally bonded to the same carbon atom to form a ring.

[0024] More 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 this invention, the magnesium source can be any magnesium-containing compound suitable for use as an olefin polymerization catalyst. For example, the magnesium source can be magnesium halide, magnesium alcohol, magnesium halohydride, or magnesium halide adduct support. The magnesium halide can be, for example, magnesium chloride and / or magnesium bromide. The magnesium alcohol can be, for example, magnesium diethoxy. The magnesium halohydride can be, for example, magnesium ethoxychloride. The types of magnesium halide adduct supports are well known to those skilled in the art. For example, magnesium halide adduct supports disclosed in patent documents CN1091748, CN101050245, CN101486722, CN102796132B, CN102796129B, and CN102796128B are included in this invention for 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 of the general formula Ti(OR′). 3-a Z a And / or Ti(OR′) 4-b Z b Titanium compounds, wherein R′ is C1-C 20 The alkyl group, Z is F, Cl, Br or I, a is an integer from 1 to 3, and b is an integer from 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 this invention, the amounts of magnesium source, titanium source, and internal electron donor can be those conventionally used in the prior art. For example, the molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor can be 1:10-180:0.1-1. Preferably, the molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor is 1:15-150:0.2-0.9.

[0028] A 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 and a titanium source are brought into contact and reacted. An internal electron donor is added before, during, and after the contact and reaction of the magnesium source and the titanium source. The mixture is then treated once or multiple times with a titanium source and washed with an inert solvent to obtain the solid catalyst component.

[0030] Preferably, the reaction between the magnesium source and the titanium source can be carried out as follows: the titanium source is cooled to below 0°C (preferably -5 to -25°C), then the magnesium source is added, and the mixture is stirred at this temperature for 10-90 minutes. The temperature is then gradually increased to the reaction temperature (approximately 70-130°C) and maintained at this temperature for 0.2-10 hours, preferably 0.5-6 hours. In the method for preparing the catalyst component for olefin polymerization, the internal electron donor is added during one or more time periods before, during, or after the reaction between the magnesium source and the titanium source. The time period before the reaction between the magnesium source and the titanium source refers to the period after the magnesium source is added to the reactor and before the temperature is increased 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 components described herein;

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

[0034] (iii) An optional external electron donor.

[0035] In this invention, the alkylaluminum compound can be any of the various alkylaluminum compounds conventionally used in the art; for example, the general formula of the alkylaluminum can be AlR. 16 R 16 'R 16 ",wherein, among which, R 16 R 16 ′ and R 16 "Each is independently a C1-C8 alkyl or halogen, and not both simultaneously halogens, with the hydrogen on the alkyl group optionally replaced by a halogen atom."

[0036] Specific examples of the C1-C8 alkyl groups 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.

[0037] Specifically, the alkylaluminum compound may be selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, di-n-hexylaluminum chloride, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, and di-n-hexylaluminum chloride.

[0038] According to the present invention, the amount of the alkylaluminum compound can be a conventional amount in the art. The molar ratio of aluminum in the alkylaluminum compound to titanium in the catalyst component can be 1-2000:1, preferably 50-800:1, and more preferably 100-500:1.

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

[0040] Preferably, the external electron donor is selected from those containing at least one Si-OR. 19 The key and the general formula is (R) 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, wherein R 17 R 18 and R 19 For C1-C 18 The hydrocarbon group, optionally containing heteroatoms, has x and y as independent integers from 0 to 2, z as integers from 1 to 3, and the sum of x, y, and z is 4. R 17 R 18 Preferably C3-C 10 Alkyl or cycloalkyl groups, optionally containing heteroatoms; R 19 Preferably C1-C 10 Alkyl groups, optionally containing heteroatoms.

[0041] Specifically, the external electron donor may 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 aluminum in the alkylaluminum compound can be 1:5-500, preferably 1:20-200.

[0043] According to the present invention, in the preparation of the catalyst for olefin polymerization, the alkylaluminum compound and the optional external electron donor can be reacted separately with the catalyst components for olefin polymerization, or the alkylaluminum compound and the optional external electron donor can be mixed first and then mixed with the catalyst components for olefin polymerization and reacted.

[0044] A fourth aspect of the invention provides the application of the catalyst described above for olefin polymerization in olefin polymerization reactions.

[0045] When the catalyst of the present invention is used in an olefin polymerization reaction, the catalyst components, alkylaluminum compounds, and optional external electron donors can be added to the polymerization reactor separately, or they can be mixed and then added to the polymerization reactor. Alternatively, the olefins can be prepolymerized using a prepolymerization method known in the industry before being added to the polymerization reactor.

[0046] In this invention, the specific types of olefins, the polymerization reaction methods and conditions of the olefins can all be conventionally selected based on existing technologies.

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

[0048] According to the present invention, the polymerization reaction of the olefin can be carried out according to existing methods, specifically, under the protection of an inert gas, in a liquid monomer or an inert solvent containing the monomer, or in the gas phase, or through a combined gas-liquid phase polymerization process. The polymerization temperature is generally 0-150°C, preferably 60-90°C. The polymerization pressure can be atmospheric pressure or higher, for example 0.01-10 MPa, preferably 0.01-5 MPa, more preferably 0.1-4 MPa; all pressures in this invention refer to gauge pressure. During the polymerization process, hydrogen can be added to the reaction system as a polymer molecular weight regulator to adjust the polymer's molecular weight and melt index. Furthermore, the types and amounts of the inert gas and solvent used in the olefin polymerization reaction are well known to those skilled in the art and will not be described further here.

[0049] Parameters not specified in this invention are all conventional techniques in the field.

[0050] 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.

[0051] The polymer melt index in this invention was determined according to GB3682-2000 at 230°C and a load of 2.16 kg.

[0052] In this invention, the polymer isotactic index is determined by the heptane extraction method (boiling heptane extraction for 6 hours). Specifically, 2g of dried polymer sample is placed in an extractor and extracted with boiling heptane for 6 hours. Afterward, the residue is dried to constant weight, and the ratio of the obtained polymer weight (g) to 2 is the isotactic index.

[0053] Examples 1-4 illustrate the catalyst components, catalysts, and applications of the present invention for olefin polymerization.

[0054] Example 1

[0055] (1) Preparation of catalyst components

[0056] In a 300 mL glass reaction flask, 80 mL of titanium tetrachloride was added and cooled to -20 °C. 33 mmol of magnesium halide support (prepared according to the method disclosed in Example 1 of CN1267508C) was added, and then the temperature was raised to 110 °C. During the heating process, 8.8 mmol of 4-tert-butoxy-4-oxobutyric acid was added. After maintaining the temperature at 110 °C for 30 min, the liquid was filtered off, washed with titanium tetrachloride, then washed with hexane, and dried under vacuum to obtain the catalyst component Cat-1 for olefin polymerization.

[0057] (2) Propylene liquid-phase bulk polymerization

[0058] Propylene liquid-phase bulk polymerization was carried out in a 5L stainless steel high-pressure reactor. Under nitrogen protection, 2 mL of triethylaluminum in hexane (0.5 mmol / mL), 0.4 mL of cyclohexylmethyldimethoxysilane (CHMMS) in hexane (0.1 mmol / mL), and 9 mg of the above-mentioned catalyst component Cat-1 for olefin polymerization were added sequentially to the reactor. The high-pressure reactor was closed, and 1.5L 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 product was discharged. The resulting 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, resulting in the 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, resulting in the 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 the 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] Propylene liquid-phase bulk polymerization was carried out using a commercially available DQC catalyst (produced by Beijing Aoda Branch) according to the method of Example 1; the resulting propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0070] Table 1

[0071]

[0072] As shown in Table 1, compared with conventional commercial catalysts, the catalyst of this invention exhibits high hydrogen sensitivity and low stereoregulation, producing a polymer with a high melt index and low isotactic index, which can meet the application requirements of low isotactic polypropylene. Compared with low isotactic catalysts, the catalyst of this invention has high polymerization activity, a simple preparation method, and good prospects for industrialization.

[0073] 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.

[0074] 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 component for olefin polymerization, characterized in that, The catalyst component comprises the reaction products of the following components: magnesium source, titanium source and internal electron donor, wherein the internal electron donor is a succinic acid monoester compound; Based on the total weight of the catalyst components, the total weight of the internal electron donors in the catalyst components is 5-25% by weight. The succinic acid monoester compound is selected from at least one of the succinic acid monoester compounds shown in formula (1). Equation (1) In equation (1), R1 is C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 alkylaryl or C7-C 20 The aralkyl group, R2 to R5, are each independently selected from hydrogen, C1-C6. 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 alkylaryl or C7-C 20 Aryl groups, the C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 alkylaryl or C7-C 20 The aralkyl group optionally contains heteroatoms, and R2 to R5 are optionally bonded to the same carbon atom to form a ring.

2. The catalyst component for olefin polymerization according to claim 1, wherein, R1 is C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl groups, C3-C 10 cycloalkyl, C6-C 10 aryl, C7-C 10 alkylaryl or C7-C 10 The aralkyl group, R2 to R5, are each independently selected from hydrogen, C1-C6. 10 Straight-chain alkyl, C3-C 10 Branched alkyl groups, C3-C 10 cycloalkyl, C6-C 10 aryl, C7-C 10 alkylaryl or C7-C 10 Aryl groups, the C1-C 10 Straight-chain alkyl, C3-C 10 Branched alkyl groups, C3-C 10 cycloalkyl, C6-C 10 aryl, C7-C 10 alkylaryl or C7-C 10 The aralkyl group optionally contains heteroatoms, and R2 to R5, which are attached to the same carbon atom, are optionally bonded to form a ring.

3. The catalyst component for olefin polymerization according to claim 2, wherein, 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.

4. The catalyst component for olefin polymerization according to claim 3, wherein, The succinic acid monoester compound is 4-tert-butoxy-4-oxobutyric acid.

5. The catalyst component for olefin polymerization according to claim 1, wherein, The magnesium source is at least one of magnesium halide, magnesium alcohol, magnesium halide alcohol, and magnesium halide adduct carrier. 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 Alkyl group, Z is halogen, a is an integer from 1 to 3, and b is an integer from 1 to 4.

6. The catalyst component for olefin polymerization according to claim 5, wherein, The magnesium source is at least one of magnesium chloride, magnesium bromide, magnesium diethoxy, and magnesium ethoxychloride.

7. The catalyst component for olefin polymerization according to claim 5, wherein, R′ is C1-C 12 Alkyl groups.

8. The catalyst component for olefin polymerization according to claim 7, wherein, R′ is a C1-C6 alkyl group.

9. The catalyst component for olefin polymerization according to claim 8, wherein, The titanium source is at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tributoxychloride, titanium dibutoxychloride, titanium butoxytrichloride, titanium triethoxychloride, titanium diethoxychloride, titanium triethoxychloride, and titanium trichloride.

10. The catalyst component for olefin polymerization according to claim 1, wherein, The molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor is 1:10-180:0.1-1.

11. The catalyst component for olefin polymerization according to claim 10, wherein, The molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor is 1:15-150:0.2-0.

9.

12. A method for preparing the catalyst component for olefin polymerization according to any one of claims 1-11, characterized in that, Includes the following steps: A magnesium source and a titanium source are brought into contact and reacted. An internal electron donor is added before, during, and after the contact and reaction of the magnesium source and the titanium source. The mixture is then treated once or multiple times with a titanium source and washed with an inert solvent to obtain the catalyst component.

13. A catalyst for olefin polymerization, characterized in that, The catalyst comprises the following reaction products: (i) the catalyst component according to any one of claims 1-11; (ii) at least one alkylaluminum compound; and (iii) An optional external electron donor.

14. The catalyst for olefin polymerization according to claim 13, wherein, The alkylaluminum 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 of the '′ is independently a C1-C8 alkyl or halogen, and not simultaneously a halogen, with the hydrogen atom on the alkyl group optionally replaced by a halogen atom.

15. The catalyst for olefin polymerization according to claim 14, wherein, The alkylaluminum compound is selected from at least one of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, di-n-hexylaluminum chloride, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, and di-n-hexylaluminum chloride.

16. The catalyst for olefin polymerization according to claim 13, wherein, The external electron donor is selected from at least one of carboxylic acids, carboxylic anhydrides, carboxylic esters, ketones, ethers, alcohols, organophosphorus compounds, and organosilicon compounds.

17. The catalyst for olefin polymerization according to claim 16, wherein, The external electron donor is selected from those containing at least one Si-OR 19 The key and the general formula is (R) 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, wherein R 17 R 18 and R 19 For C1-C 18 The hydrocarbon group, optionally containing heteroatoms, x and y are each independent integers from 0 to 2, z is an integer from 1 to 3, and the sum of x, y, and z is 4.

18. The catalyst for olefin polymerization according to claim 17, wherein, R 17 R 18 For C3-C 10 Alkyl or cycloalkyl groups, optionally containing heteroatoms.

19. The catalyst for olefin polymerization according to claim 17, wherein, R 19 For C1-C 10 Alkyl groups, optionally containing heteroatoms.

20. The catalyst for olefin polymerization according to claim 17, 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.

21. The catalyst for olefin polymerization according to claim 13, wherein, The molar ratio of the catalyst component (calculated as titanium) to the alkylaluminum compound (calculated as aluminum) is 1:1-2000. The molar ratio of the external electron donor to the alkylaluminum compound (calculated as aluminum) is 1:5-500.

22. The catalyst for olefin polymerization according to claim 21, wherein, The molar ratio of the catalyst component (calculated as titanium) to the alkylaluminum compound (calculated as aluminum) is 1:50-800.

23. The catalyst for olefin polymerization according to claim 22, wherein, The molar ratio of the catalyst component (calculated as titanium) to the alkylaluminum compound (calculated as aluminum) is 1:100-500.

24. The catalyst for olefin polymerization according to claim 21, wherein, The molar ratio of the external electron donor to the alkylaluminum compound (calculated as aluminum) is 1:20-200.

25. The use of the catalyst for olefin polymerization according to any one of claims 13-24 in olefin polymerization reactions.

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