Catalyst component for olefin polymerization as well as preparation method, catalyst and application thereof

Abstract

The invention discloses a catalyst component for olefin polymerization as well as a preparation method, a catalyst and application thereof, and relates to the technical field of olefin polymerization. The catalyst component for olefin polymerization comprises reaction products of the following components: a magnesium compound, an organic anhydride compound, an acetate compound, an alcohol compound, a titanium-containing compound and an internal electron donor, the molar ratio of the magnesium element in the magnesium compound to the organic acid anhydride compound to the acetate compound to the alcohol compound to the titanium-containing compound to the internal electron donor is 1: (0.03-1.0): (0.01-5): (0.1-10): (0.5-120): (0.01-1). According to the invention, when an organic anhydride compound, an acetate compound, an alcohol compound and the internal electron donor are introduced into an N-series polyolefin catalyst preparation system as a compound electron donor, spherical or sphere-like solid particles (solid catalyst components) containing magnesium and titanium can be prepared. The catalyst particles are high in polymerization activity and narrow in particle size distribution, and polyethylene powder with high bulk density can be obtained through polymerization. Under further preferable conditions, the powder obtained through polymerization is high in sphericity degree, high in molecular weight and good in fluidity.

Description

Technical Field

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

[0002] Ultra-high molecular weight polyethylene (UHMWPE) is a special type of polyethylene with a molecular weight greater than 1.5 million. Most commercially available UHMWPE is currently prepared using Ziegler-Natta catalysts (ZN catalysts), possessing comprehensive properties unmatched by ordinary polyethylene and other engineering plastics, including wear resistance, impact resistance, self-lubrication, corrosion resistance, low-temperature resistance, hygiene and non-toxicity, non-adhesion, low water absorption, and low density. Currently, products such as lithium-ion battery separators, with molecular weights between 500,000 and 1.5 million, are also generally referred to as UHMWPE due to their similar properties.

[0003] For specialized resins used in the production of high-end UHMWPE products, different application scenarios require suitable molecular weight, narrow particle size distribution, good particle morphology, low ash content, and good flowability. High-end UHMWPE products need sufficiently high molecular weight and good flowability to improve work efficiency during production and prevent bridging and other phenomena that could affect production operations. Industrially, the angle of repose is generally used to test the flowability of polymer powders. The smaller the angle of repose, the lower the friction and the better the flowability. Generally, θ≤30 degrees is considered good flowability, and θ≤40 degrees can meet the flowability requirements in the production process. When UHMWPE products are used in fiber or artificial joint applications, their molecular weight must reach 6 million or higher to ensure sufficient mechanical strength. When UHMWPE products are used in lithium battery separators or artificial joints, they must have low ash content to improve the product's puncture resistance or reduce its impact on human health, and ideally, good flowability. Currently, most widely used high-end UHMWPE products are imported, and domestic UHMWPE powder manufacturers still have room for improvement. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a catalyst component for olefin polymerization, its preparation method, the catalyst, and its applications. By introducing organic acid anhydrides, acetate compounds, alcohols, and the internal electron donor as a complex electron donor into an N-series polyolefin catalyst preparation system, this invention can prepare spherical or near-spherical solid particles (solid catalyst components) containing magnesium and titanium. These catalyst particles exhibit high polymerization activity and narrow particle size distribution, enabling polymerization to obtain polyethylene powder with high bulk density. Under further preferred conditions, the polymerized powder exhibits high sphericity, high molecular weight, and good flowability.

[0005] One of the objectives of this invention is to provide a catalyst component for olefin polymerization.

[0006] The catalyst component for olefin polymerization described in this invention comprises the reaction products of the following components:

[0007] Magnesium complexes, organic acid anhydrides, acetate compounds, alcohols, titanium-containing compounds, and internal electron donors;

[0008] The molar ratio of magnesium to organic acid anhydrides, acetates, alcohols, titanium-containing compounds, and internal electron donors in the magnesium complex is 1:(0.03-1.0):(0.01-5):(0.1-10):(0.5-120):(0.01-1).

[0009] In a preferred embodiment of the present invention:

[0010] The molar ratio of magnesium to organic acid anhydrides, acetates, alcohols, titanium-containing compounds, and internal electron donors in the magnesium complex is 1:(0.1-0.3):(0.5-3):(0.1-5.0):(5-20):(0.05-0.20).

[0011] In a preferred embodiment of the present invention, the magnesium complex comprises the reaction product of the following components:

[0012] Magnesium halides, organic epoxy compounds, organophosphorus compounds, and optionally inert diluents;

[0013] The molar ratio of magnesium to organic epoxy and organic phosphorus compounds in the magnesium halide is 1:(0.2-10):(0.1-10), preferably 1:(0.5-2.0):(0.5-2.0);

[0014] When the inert diluent is included, the molar ratio of magnesium in the magnesium halide to the inert diluent is 1:(5-50); preferably 1:(10-30).

[0015] In this invention, the proportions of each raw material can be selected within a wide range. In a preferred embodiment of this invention, relative to magnesium halide per mole of magnesium, the amount of organic epoxy compound is 0.2-10 mol; the amount of organic phosphorus compound is 0.1-10 mol; the amount of organic acid anhydride compound is 0.03-1.0 mol; the amount of acetate compound is 0.01-1 mol; the amount of alcohol compound is 0.1-4 mol; the amount of titanium-containing compound is 0.5-120 mol; and the amount of internal electron donor is 0.01-1 mol. In this preferred embodiment, the resulting catalyst components correspond to catalysts with higher polymerization activity, enabling the polymerization of polyethylene powder with higher bulk density, narrower particle size distribution, and narrower molecular weight distribution. More preferably, relative to magnesium halide per mole of magnesium, the amount of organic epoxy compound is 0.5-2.0 mol; the amount of organic phosphorus compound is 0.5-2.0 mol; the amount of organic acid anhydride compound is 0.1-0.3 mol; the amount of acetate compound is 0.05-0.20 mol; the amount of alcohol compound is 0.1-2.0 mol; the amount of titanium-containing compound is 5-20 mol; and the amount of internal electron donor is 0.05-0.20 mol.

[0016] In a preferred embodiment of the present invention:

[0017] The structural formula of the internal electron donor is:

[0018]

[0019] Wherein R1 and R6 may be the same or different, and are independently one of hydrogen, halogen, halogen-substituted or unsubstituted C1-C10 straight-chain alkyl, halogen-substituted or unsubstituted C1-C10 branched-chain alkyl, halogen-substituted or unsubstituted C1-C10 alkoxy, preferably one of methyl, ethyl, halomethyl, haloethyl; R2, R3, R4, and R5 may be the same or different, and are independently one of C1-C10 hydrocarbon groups, preferably methyl or ethyl; n is any integer from 0 to 10, preferably any integer from 0 to 2; more preferably,

[0020] The internal electron donor is at least one of the following compounds:

[0021] Compound A: R1 is CH3; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH3; n is 0;

[0022] Compound B: R1 is CH3; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH3; n is 1;

[0023] Compound C: R1 is CH3; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH3; n is 2;

[0024] Compound D: R1 is CH2CH3; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH3; n is 0;

[0025] Compound E: R1 is CH2CH3; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH2CH3; n is 1;

[0026] Compound F: R1 is ClCH2; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH2CH3; n is 1;

[0027] Compound G: R1 is ClCHCH3; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH3; n is 1;

[0028] Compound H: R1 is ClCHCH3; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH2CH3; n is 1;

[0029] Compound I: R1 is ClCH2; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is ClCHCH3; n is 1;

[0030] Compound J: R1 is CH3; R2 is CH2CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH3; n is 1;

[0031] Compound K: R1 is CH3; R2 is CH2CH3; R3 is CH2CH3; R4 is CH3; R5 is CH3; R6 is CH3; n is 1;

[0032] Compound L: R1 is CH3; R2 is CH2CH3; R3 is CH3; R4 is CH2CH3; R5 is CH3; R6 is CH3; n is 1;

[0033] Compound M: R1 is CH3; R2 is CH2CH3; R3 is CH2CH3; R4 is CH2CH3; R5 is CH3; R6 is CH3; n is 1;

[0034] Compound N: R1 is CH3; R2 is CH2CH3; R3 is CH2CH3; R4 is CH2CH3; R5 is CH2CH3; R6 is CH3; n is 1;

[0035] Compound O: R1 is ClCH2; R2 is CH2CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH3; n is 1;

[0036] Compound P: R1 is ClCH2; R2 is CH2CH3; R3 is CH2CH3; R4 is CH3; R5 is CH3; R6 is CH3; n is 1;

[0037] Compound Q: R1 is ClCH2; R2 is CH2CH3; R3 is CH3; R4 is CH2CH3; R5 is CH3; R6 is CH3; n is 1;

[0038] Compound R: R1 is ClCH2; R2 is CH2CH3; R3 is CH2CH3; R4 is CH2CH3; R5 is CH2CH3; R6 is CH3; n is 1;

[0039] Compound S: R1 is ClCHCH3; R2 is CH2CH3; R3 is CH2CH3; R4 is CH2CH3; R5 is CH2CH3; R6 is CH3; n is 1.

[0040] In a preferred embodiment of the present invention:

[0041] The magnesium halide is magnesium dihalide or a complex formed by magnesium dihalide and at least one of water, alcohol, and an electron carrier; preferably, the magnesium dihalide is at least one of magnesium dichloride, magnesium dibromide, magnesium difluoride, and magnesium diiodide, more preferably magnesium dichloride, and / or, the alcohol is at least one of methanol, ethanol, propanol, butanol, pentanol, hexanol, and isooctanol, and / or, the electron carrier is at least one of ammonia, hydroxylamine, ether, and ester; and / or,

[0042] The organic epoxy compound is at least one of C2-C18 aliphatic olefins, aliphatic dienes, halogenated aliphatic olefins, oxides of halogenated aliphatic dienes, glycidyl ethers, and internal ethers, preferably at least one of ethylene oxide, propylene oxide, epibutane oxide, butadiene oxide, epichlorohydrin, glycidyl methacrylate, ethyl glycidyl ether, and butyl glycidyl ether; and / or,

[0043] The organophosphorus compound is at least one selected from the group consisting of orthophosphoric acid hydrocarbon esters, orthophosphoric acid halohydrophosphoric acid esters, phosphite hydrocarbon esters, and phosphite halohydrophosphoric acid esters, preferably trimethyl phosphate, triethyl phosphate, tri-n-propyl phosphate, triisopropyl phosphate, tri-n-butyl phosphate, triisobutyl phosphate, tri-tert-butyl phosphate, tri-n-pentyl phosphate, triisopentyl phosphate, tri-n-hexyl phosphate, triisohexyl phosphate, tri-n-heptyl phosphate, triisoheptyl phosphate, tri-n-octyl phosphate, and triisooctyl phosphate. At least one of the following: ester, triphenyl phosphate, trimethyl phosphite, triethyl phosphite, tri-n-propyl phosphite, triisopropyl phosphite, tri-n-butyl phosphite, triisobutyl phosphite, tri-tert-butyl phosphite, tri-n-pentyl phosphite, triisopentyl phosphite, tri-n-hexyl phosphite, tri-n-heptyl phosphite, triisoheptyl phosphite, tri-n-octyl phosphite, triisooctyl phosphite, triphenyl phosphite, and di-n-butyl phosphite; and / or,

[0044] To ensure more complete dissolution of magnesium halide, an inert diluent may be optionally added, wherein the inert diluent is an aromatic compound or an alkane compound; preferably, the aromatic compound is at least one of benzene and its derivatives, toluene and its derivatives, xylene and its derivatives, monochlorobenzene and its derivatives, dichlorobenzene and its derivatives, trichlorobenzene and its derivatives, and monochlorotoluene and its derivatives; and / or, the alkane compound is at least one of C3-C20 straight-chain alkanes, branched alkanes, or cycloalkanes, preferably at least one of butane, pentane, hexane, cyclohexane, and heptane.

[0045] In a preferred embodiment of the present invention:

[0046] The structural formula of the organic acid anhydride compound is as follows: Wherein R5' and R6' may be the same or different, and are independently one of hydrogen, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C3-C10 cycloalkyl, and C6-C10 aromatic hydrocarbon groups, and / or, R5' and R6' may be arbitrarily cyclic; preferably, the organic acid anhydride compound is at least one of acetic anhydride, propionic anhydride, butyric anhydride, acrylic anhydride, phthalic anhydride, butylene anhydride, and maleic anhydride; and / or,

[0047] The acetate ester compound has the chemical formula CH3COOR7, wherein R7 is one of a C1-C10 alkyl group, a C2-C10 alkenyl group, a C3-C10 cycloalkyl group, a C2-C10 alkynyl group, or a C6-C10 aromatic hydrocarbon group. Preferably, the acetate ester compound is at least one of methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, n-pentyl acetate, n-hexyl acetate, or n-octyl acetate; and / or,

[0048] The alcohol compound is a C1-C18 fatty alcohol or a C1-C18 aromatic alcohol, preferably at least one selected from methanol, ethanol, propanol, isopropanol, butanol, isobutanol, tert-butanol, hexanol, cyclohexanol, octanol, isooctanol, benzyl alcohol, phenethyl alcohol, ethylene glycol, propylene glycol, butanediol, hexanediol, and isohexanediol; more preferably at least one selected from butanol, isobutanol, tert-butanol, hexanol, cyclohexanol, octanol, isooctanol, benzyl alcohol, phenethyl alcohol, butanediol, hexanediol, and isohexanediol; and / or,

[0049] The chemical formula of the titanium-containing compound is Ti(OR8). a X b R8 is a C1-C10 aliphatic hydrocarbon group or a C1-C10 aromatic hydrocarbon group, preferably one of C1-C6 alkyl, C2-C6 alkenyl, C3-C8 cycloalkyl, and C6-C10 aromatic hydrocarbon group; X is a halogen, preferably one of fluorine, chlorine, and bromine; a is any integer from 0 to 2, b is any integer from 1 to 4, and the sum of a and b is 3 or 4; more preferably, the titanium-containing compound is at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium monochlorotriethoxy, titanium trichloride, titanium dichlorodiethoxy, and titanium trichloromonethoxy.

[0050] A second objective of this invention is to provide a method for preparing a catalyst component for olefin polymerization as described in one objective of this invention.

[0051] The method for preparing the catalyst component for olefin polymerization according to the present invention includes:

[0052] A magnesium complex is reacted with an organic acid anhydride compound, cooled, and then a titanium-containing compound and an alcohol compound are added sequentially. After heating and reacting, an internal electron donor is added for high-temperature treatment, and the catalyst component is obtained through post-treatment. The catalyst component is obtained by adding an acetate compound and / or an internal electron donor during the reaction of the magnesium complex with the organic acid anhydride compound and / or during the sequential addition of the titanium-containing compound and the alcohol compound.

[0053] In a preferred embodiment of the present invention, the method includes:

[0054] (a) The magnesium complex is prepared by dissolving magnesium halide in a solvent system containing an organic epoxy compound, an organophosphorus compound, and optionally an inert diluent; specifically, the magnesium halide and the solvent system containing the organic epoxy compound and the organophosphorus compound can be reacted at 50-70°C for 1-3 hours to form a homogeneous solution; in some embodiments, the reaction temperature is 60°C; in some embodiments, the reaction time is 2 hours.

[0055] (b) The magnesium complex is reacted with an organic acid anhydride to obtain a first reaction mixture; in a preferred embodiment of the present invention, the reaction temperature of the contact reaction may be the same as or different from the temperature in step (a), preferably 50-70°C, and the reaction time is 0.5-2 hours.

[0056] (c) After cooling the first reaction mixture, a titanium-containing compound is added to obtain a second reaction mixture;

[0057] (d) Continue to add alcohol compounds, and after heating the reaction, a third reaction mixture is obtained;

[0058] (e) Continue to add internal electron donors for high-temperature treatment, remove unreacted substances and solvents, and wash to obtain the catalyst component;

[0059] In this process, an acetate compound and / or an internal electron donor are added in at least one of steps (a), (b), (c), and (d).

[0060] In the above technical solution, "adding an acetate compound and / or an internal electron donor in at least one of steps (a), (b), (c), and (d)" means that the acetate compound and / or internal electron donor can be added in one of steps (a), (b), (c), and (d), or the acetate compound and / or internal electron donor can be added in two, three, or four of the above four steps, all of which can achieve the present invention.

[0061] When organic acid anhydride compounds, acetate compounds, alcohol electron donors, and internal electron donors are introduced as compound electron donors into the N-series polyolefin catalyst preparation system according to the specific method and steps described above, especially when alcohol compounds, acetate compounds, and internal electron donor compounds are added at the specific timing of this invention, unexpectedly, the resulting catalyst components and the corresponding catalyst polymerization activity are further improved, and polyethylene powder with further improved bulk density, particle size distribution, molecular weight, and narrower molecular weight distribution can also be obtained through polymerization.

[0062] In a preferred embodiment of the present invention:

[0063] The contact reaction is carried out at a temperature of 50-70°C and / or for a reaction time of 0.5-2 hours; and / or,

[0064] The cooled temperature is between -60°C and -20°C; and / or,

[0065] The reaction temperature of the temperature-raising reaction is 75°C - 100°C, and / or the reaction time is 1 - 4 h, and / or the heating rate is 0.2 - 2°C / min; and / or

[0066] The reaction temperature of the high-temperature treatment is 70°C - 90°C, and / or the reaction time is 0.5 - 2 h.

[0067] In a preferred embodiment of the present invention:

[0068] In step (a): the temperature for dissolution is 50 - 70°C, and / or the dissolution time is 1 - 3 hours.

[0069] The third object of the present invention is to provide a catalyst for olefin polymerization.

[0070] The catalyst for olefin polymerization described in the present invention includes:

[0071] an organoaluminum compound and the catalyst component described in one of the objects of the present invention or the catalyst component prepared by the method described in the second object of the present invention;

[0072] The molar ratio of the aluminum element in the organoaluminum compound to the titanium element in the catalyst component is (5 - 500):1, preferably (20 - 200):1, and more preferably (50 - 100):1.

[0073] In a preferred embodiment of the present invention:

[0074] The chemical formula of the organoaluminum compound is AlR’ d X’ 3-d , where R’ is hydrogen or a C1-C20 hydrocarbon group, preferably one of a C1-C20 alkyl group, a C1-C20 aralkyl group, and a C1-C20 aryl group, X’ is a halogen atom, preferably one of fluorine, chlorine, and bromine, and 0 < d ≤ 3; more preferably, the organoaluminum compound is at least one of Al(CH3)3, Al(CH2CH3)3, Al(i-Bu)3, AlH(CH2CH3)2, AlH(i-Bu)2, AlCl(CH2CH3)2, Al2Cl3(CH2CH3)3, AlCl(CH2CH3)2, AlCl2(CH2CH3), and further preferably Al(CH2CH3)3 and / or Al(i-Bu)3.

[0075] The fourth object of the present invention is to provide the use of the catalyst described in the third object of the present invention in olefin polymerization.

[0076] The use of the catalyst described in the present invention in olefin polymerization; preferably,

[0077] The olefin has the chemical formula CH2=CHR, where R is hydrogen or a C1-C6 alkyl group; more preferably, the olefin is at least one selected from ethylene, propylene, and butene; and / or,

[0078] The ethylene polymerization is carried out using slurry polymerization or gas-phase polymerization; more preferably, the medium for slurry polymerization is an inert solvent, preferably a saturated aliphatic hydrocarbon and / or aromatic hydrocarbon, more preferably at least one selected from isobutane, hexane, heptane, cyclohexane, naphtha, raffinate, hydrogenated gasoline, kerosene, benzene, toluene, and xylene; and / or,

[0079] The product of the olefin polymerization is an ultra-high molecular weight polyolefin, preferably ultra-high molecular weight polyethylene; and / or...

[0080] The reaction pressure for the olefin polymerization is 0.1-3 MPa, and / or the reaction temperature is 50℃-100℃, and / or the reaction time is 1.5-10 h.

[0081] According to an embodiment of the present invention, when ethylene is polymerized at 1 MPa and 70°C for 2 hours, the polyethylene powder of the present invention has a bulk density ≥ 0.38 g / ml, a molecular weight ≥ 700, an angle of repose ≤ 40°, and a particle size distribution ≤ 0.9.

[0082] In this specification, the term "aliphatic hydrocarbon group" refers to a straight-chain or branched chain hydrocarbon group consisting only of carbon and hydrogen atoms. Specific examples include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, vinyl, 1-propenyl, allyl, ethynyl, 1-propynyl, 2-propynyl, butynyl, etc.

[0083] In this specification, "aromatic hydrocarbon group" refers to a hydrocarbon group having a benzene ring, including aryl, aryl-substituted hydrocarbon groups, or hydrocarbon-substituted aryl groups, such as phenyl, benzyl, anthracene, and naphthyl.

[0084] Through research, the inventors discovered that by introducing organic acid anhydrides, acetate compounds, alcohol electron donors, and internal electron donors as composite electron donors into the N-series polyolefin catalyst preparation system, spherical or near-spherical solid particles (solid catalyst components) containing magnesium and titanium can be prepared. Introducing internal electron donors into the ZN catalyst reduces the active centers for generating low-molecular-weight PE components, resulting in catalysts with high catalytic activity. These catalysts can polymerize polyethylene powder with high bulk density, good particle morphology, narrow particle size distribution, high molecular weight, and good flowability. After polymerization for 2 hours at 1 MPa and 70°C, the polyethylene powder of this invention exhibits a bulk density ≥0.38 g / ml and a molecular weight ≥700 × 10⁻⁶. 4 g / mol, angle of repose ≤40°, particle size distribution of polymer powder ≤0.9.

[0085] Compared with the prior art, the present invention has the following advantages:

[0086] (1) As described above, the catalyst particles of this invention have high polymerization activity and narrow particle size distribution, and can be polymerized to obtain polyethylene powder with high bulk density and good flowability.

[0087] (2) The present invention uses simple raw materials, the raw materials are simple to source, the preparation method is simple and controllable, and the cost is low.

[0088] (3) This invention belongs to the category of dissolution-emission catalysts. As can be verified, different catalysts can be obtained by using different conditions and different electron donors. After the catalyst is polymerized, products with specific particle size and specific molecular weight can be obtained. This is an important manifestation of the superiority of this invention. It can produce special catalyst products with specific particle size and different molecular weights to meet the needs of different markets.

[0089] In summary, this invention improves the performance of existing Ziegler-Natta type olefin polymerization catalyst particles using simple raw materials, at a lower cost, and has extremely high value for widespread application. Detailed Implementation

[0090] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the content of the present invention are still within the scope of protection of the present invention.

[0091] The raw materials used in the embodiments and comparative examples of this invention are all commercially available products.

[0092] Internal electron donor: Preparation of compound A: The structural formula is shown in formula (Ⅰ), where R1 is CH3; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH3; and n is 0. Using commercially available reagent (Innochem, Accela, SY393632, CasNo: 201471-78-5), the halogenated borate ester group was removed from the compound by lithium n-butyllithium, followed by a classical metal coupling reaction (Suzuki coupling reaction) to obtain compound A with a molecular weight of 135. The synthetic route is as follows:

[0093]

[0094] The specific steps of the Suzuki coupling were as follows: the reaction flask was replaced with a nitrogen atmosphere, and substrate 1 and substrate 2 were added in a 1:1 molar ratio. Then, 3% of the total molar amount of tetraphenylphosphine palladium (CAS No.: 14221-01-3) of substrate 1 and substrate 2 was added, followed by the addition of anhydrous toluene (CAS No.: 108-88-3). The reaction was carried out at 50°C for 12 hours. After the reaction was completed, the solvent was removed by rotary evaporation, and compound A was obtained by column chromatography purification.

[0095] Internal electron donor: Preparation of compound B: The structural formula is shown in formula (Ⅰ), where R1 is CH3; R2 is CH3; R3 is CH3; R4 is CH3; R5 is CH3; R6 is CH3; and n is 1. Referring to existing technology Tetrahedron, Vol. 52, No. 7, pp. 2385-2394, 1996, two commercially available reagents (Innochem, alfa, A11617, Cas No: 4463-33-6 and Sigma Aldrich, ENAH99278D07, Cas No: 75889-47-3) were used to generate an electrophilic agent in situ via hydrogen extraction from n-butyllithium to attack the aldehyde group, yielding the corresponding intermediate. Subsequently, acetic anhydride esterification and palladium reduction on carbon were performed to obtain compound B with a molecular weight of 149. The specific synthetic route is as follows:

[0096]

[0097] The test methods for embodiments and comparative examples of the present invention are as follows:

[0098] 1. Determination of polymer bulk density: The apparent density, volume factor and pourability of plastics are determined using the test method (ASTM D1895).

[0099] 2. Polymer molecular weight test: determined according to ASTM D4020-18.

[0100] 3. Determination of polymer sphericity: The sphericity was determined using a Camsizer particle size analyzer from Retsch GmbH, Germany.

[0101] 4. Particle size distribution of the polymer: determined using a Malvern laser particle size and shape analyzer.

[0102] 5. Determination of polymerization activity: The activity is calculated by dividing the mass of the powder obtained from polymerization by the amount of catalyst added.

[0103] 6. Angle of Repose: When powder is slowly added from above the funnel, the angle at which the material leaking from the bottom of the funnel forms a conical accumulation on a horizontal surface. The angle of repose reflects the magnitude of the dynamic friction coefficient between powder particles. When powder naturally falls onto a specific platform and accumulates, a smaller angle of repose means less internal friction between particles, thus allowing the powder to flow more easily. The angle of repose is a key indicator for evaluating the flowability of powder or granular materials, and its magnitude directly reflects the quality of the material's flowability. Generally, an angle of repose less than 40° is considered to indicate good powder flowability.

[0104] The following embodiments are examples of the present invention in more detail, but the present invention is not limited to these embodiments.

[0105] Example 1

[0106] (1) Preparation of catalyst components:

[0107] 4.8 g of magnesium chloride, 110 ml of toluene, 5.0 ml of epichlorohydrin, and 20.0 ml of tri-n-butyl phosphate were added to a reaction vessel. The mixture was reacted for 2 hours at a stirring speed of 450 rpm and a temperature of 60°C. Then, 1.5 g of phthalic anhydride was added, and the mixture was kept at a constant temperature for another hour. The temperature was then lowered to -30°C, and 85 ml of titanium tetrachloride was added dropwise, followed by 3 ml of ethyl acetate and 8 ml of ethanol. The temperature was then gradually increased (controlled within the range of 0.2-2°C / min) to 80°C and kept at a constant temperature for 1 hour. 2 g of the electron donor, compound A, was added, and the mixture was kept at a constant temperature for another hour. The mother liquor was filtered off, and the mixture was washed multiple times with inert diluent toluene and organic solvent hexane, and then dried to obtain a solid catalyst component with good flowability.

[0108] (2) Polymerization reaction:

[0109] A 2L stainless steel reactor was fully purged with high-purity nitrogen, then 1L of hexane and 1.0ml of 1M triethylaluminum were added, followed by the solid catalyst component (containing 0.6 mg of titanium) prepared by the above method. The temperature was raised to 60℃, and ethylene was introduced to bring the total pressure inside the reactor to 1 MPa (gauge pressure). Polymerization was carried out at 70℃ for 2 hours. The polymerization results are shown in Table 1.

[0110] Example 2

[0111] (1) Preparation of catalyst components:

[0112] 4.8 g of magnesium chloride, 100 ml of toluene, 8.0 ml of ethylene oxide, and 18.0 ml of tri-n-propyl phosphate were added to a reaction vessel. The mixture was reacted for 2 hours at a stirring speed of 450 rpm and a temperature of 60°C. Then, 1.2 g of phthalic anhydride was added, and the mixture was kept at this temperature for another hour. The temperature was then lowered to -30°C, and 80 ml of titanium tetrachloride was added dropwise, followed by 2 ml of ethyl acetate and 8 ml of ethanol. The temperature was then gradually increased (controlled within the range of 0.2-2°C / min) to 80°C and kept at this temperature for another hour. 2 g of the electron donor, compound A, was added, and the mixture was kept at this temperature for another hour. The mother liquor was filtered off, and the mixture was washed multiple times with inert diluent toluene and organic solvent hexane, and then dried to obtain a solid catalyst component with good flowability.

[0113] (2) Polymerization reaction: Same as in Example 1, the polymerization results are shown in Table 1.

[0114] Example 3

[0115] (1) Preparation of catalyst components:

[0116] 4.8 g of magnesium chloride, 120 ml of toluene, 8.0 ml of epichlorohydrin, and 25.0 ml of triethyl phosphate were added to a reaction vessel. The mixture was reacted for 2 hours at 450 rpm and 60°C. Then, 2 g of phthalic anhydride was added, and the reaction was continued at this temperature for 1 hour. The temperature was then lowered to -30°C, and 65 ml of titanium tetrachloride was added dropwise, followed by 2 ml of ethyl acetate and 5 ml of butanol. The temperature was then gradually increased (controlled within the range of 0.2-2°C / min) to 80°C and held for 1 hour. 2 g of the electron donor, compound A, was added, and the reaction was continued at this temperature for 1 hour. The mother liquor was filtered off, and the mixture was washed multiple times with toluene (an inert diluent) and hexane (an organic solvent), and then dried to obtain a solid catalyst component with good flowability.

[0117] (2) Polymerization reaction: Same as in Example 1, the polymerization results are shown in Table 1.

[0118] Example 4

[0119] (1) Preparation of catalyst components:

[0120] 4.8 g magnesium chloride, 120 ml xylene, 6.0 ml glycidyl methacrylate, and 18.0 ml tri-n-butyl phosphate were added to a reaction vessel. The mixture was reacted for 2 hours at 450 rpm and 60°C. Then, 1.2 g phthalic anhydride was added, and the reaction was continued at this temperature for 1 hour. The temperature was then lowered to -30°C, and 60 ml tetraethoxytitanium was added dropwise, followed by 2 ml propyl acetate and 8 ml isooctanol. The temperature was then gradually increased (controlled within the range of 0.2-2°C / min) to 80°C and held for 1 hour. 2 g of the electron donor, compound B, was added, and the reaction was continued at this temperature for 1 hour. The mother liquor was filtered off, and the mixture was washed multiple times with toluene (an inert diluent) and hexane (an organic solvent), and then dried to obtain a solid catalyst component with good flowability.

[0121] (2) Polymerization reaction: Same as in Example 1, the polymerization results are shown in Table 1.

[0122] Example 5

[0123] (1) Preparation of catalyst components:

[0124] 4.8 g of magnesium bromide, 150 ml of xylene, 12.0 ml of epichlorohydrin, 25.0 ml of triisobutyl phosphate, and 2 g of the internal electron donor, compound B, were added to a reaction vessel. The reaction was carried out for 2 hours at a stirring speed of 400 rpm and a temperature of 62°C. Then, 2.2 g of phthalic anhydride was added, and the reaction was continued at this temperature for another hour. The temperature was then lowered to -30°C, and 180 ml of titanium tetrachloride was added dropwise, followed by 6 ml of ethyl acetate and 12 ml of butanol. The temperature was then gradually increased (controlled within the range of 0.2-2°C / min) to 85°C and held at this temperature for 1 hour. Then, 2 g of the internal electron donor, compound B, was added, and the reaction was continued at this temperature for another hour. The mother liquor was filtered off, and the mixture was washed multiple times with inert diluent toluene and organic solvent hexane, and then dried to obtain a solid catalyst component with good flowability.

[0125] (2) Polymerization reaction: Same as in Example 1, the polymerization results are shown in Table 1.

[0126] Example 6

[0127] (1) Preparation of catalyst components:

[0128] 4.8 g magnesium chloride, 40 ml toluene, 4.0 ml epichlorohydrin, and 8.0 ml triisobutyl phosphate were added to a reactor. The reaction was carried out for 2 hours at 400 rpm and 62°C. Then, 1.2 g phthalic anhydride was added, and the mixture was kept at this temperature for another hour. The temperature was then lowered to -30°C, and 60 ml titanium tetrachloride was added dropwise, followed by 1 ml n-butyl acetate and 2 ml n-hexanol. The temperature was then gradually increased (controlled within the range of 0.2-2°C / min) to 85°C and kept at this temperature for 1 hour. Then, 1 g of internal electron donor (compound A) and 1 g of internal electron donor (compound B) were added, and the mixture was kept at this temperature for another hour. The mother liquor was filtered off, and the mixture was washed multiple times with inert diluent toluene and organic solvent hexane, and then dried to obtain a solid catalyst component with good flowability.

[0129] (2) Polymerization reaction: Same as in Example 1, the polymerization results are shown in Table 1.

[0130] Example 7

[0131] (1) Preparation of catalyst components:

[0132] 4.8 g of magnesium chloride, 90 ml of hexane, 4.0 ml of epichlorohydrin, and 8.0 ml of tri-n-butyl phosphate were added to a reaction vessel. The mixture was reacted for 2 hours at 400 rpm and 62°C. Then, 1.2 g of propionic anhydride was added, and the reaction was continued at this temperature for another hour. The temperature was then lowered to -30°C, and 80 ml of titanium tetrachloride was added dropwise, followed by 1 ml of ethyl acetate and 4 ml of ethanol. The temperature was then gradually increased (controlled within the range of 0.2-2°C / min) to 85°C and held for 1 hour. Then, 3 g of the electron donor, compound A, was added, and the reaction was continued at this temperature for another hour. The mother liquor was filtered off, and the mixture was washed several times with hexane and dried to obtain a solid catalyst component with good flowability.

[0133] (2) Polymerization reaction: After the stainless steel reactor with a volume of 2L was fully purged with high-purity nitrogen, 1L of hexane and 5.0ml of 1M triethylaluminum were added, followed by the solid catalyst component (containing 0.6 mg of titanium) prepared by the above method. The temperature was raised to 60℃, and ethylene was introduced to make the total pressure in the reactor reach 1Mpa (gauge pressure). Polymerization was carried out at 70℃ for 2 hours. The polymerization results are shown in Table 1.

[0134] Example 8

[0135] (1) Preparation of catalyst components:

[0136] 4.8 g magnesium chloride, 120 ml toluene, 4.0 ml epichlorohydrin, and 18.0 ml triisobutyl phosphate were added to a reaction vessel. The mixture was reacted for 2 hours at 400 rpm and 62°C. Then, 1.2 g phthalic anhydride was added, and the reaction was continued at this temperature for 1 hour. The temperature was then lowered to -30°C, and 50 g titanium trichloride was added dropwise, followed by 1 ml n-butyl acetate and 6 ml ethanol. The temperature was then gradually increased (controlled within the range of 0.2-2°C / min) to 85°C and held for 1 hour. 3 g of the electron donor, compound B, was added, and the reaction was continued at this temperature for 1 hour. The mother liquor was filtered off, and the mixture was washed multiple times with inert diluent toluene and organic solvent hexane, and then dried to obtain a solid catalyst component with good flowability.

[0137] (2) Polymerization reaction: After the stainless steel reactor with a volume of 2L was fully purged with high-purity nitrogen, 1L of hexane and 0.1ml of 1M diethylaluminum chloride were added, followed by the solid catalyst component (containing 0.6 mg of titanium) prepared by the above method. The temperature was raised to 60℃, and ethylene was introduced to make the total pressure in the reactor reach 1 MPa (gauge pressure). Polymerization was carried out at 70℃ for 2 hours. The polymerization results are shown in Table 1.

[0138] Comparative Example 1

[0139] (1) Preparation of catalyst components:

[0140] 4.8 g magnesium chloride, 110 ml toluene, 5.0 ml epichlorohydrin, and 20.0 ml tri-n-butyl phosphate were added to a reaction vessel. The mixture was reacted for 2 hours at 450 rpm and 60°C. Then, 1.5 g phthalic anhydride was added, and the mixture was kept at this temperature for another hour. The temperature was then lowered to -30°C, and 85 ml titanium tetrachloride was added dropwise, followed by 3 ml ethyl acetate and 8 ml ethanol. The temperature was then gradually increased (controlled within the range of 0.2-2°C / min) to 80°C and kept at this temperature for 1 hour. The mother liquor was filtered off, and the mixture was washed multiple times with toluene (an inert diluent) and hexane (an organic solvent) and dried to obtain a solid catalyst component with good flowability.

[0141] (2) Polymerization reaction: Same as in Example 1, the polymerization results are shown in Table 1.

[0142] Comparative Example 2

[0143] (1) Preparation of catalyst components:

[0144] 4.8 g magnesium chloride, 100 ml toluene, 8.0 ml ethylene oxide, and 18.0 ml tri-n-propyl phosphate were added to a reaction vessel. The mixture was reacted for 2 hours at 450 rpm and 60°C. Then, 1.2 g phthalic anhydride was added, and the mixture was kept at this temperature for another hour. The temperature was then lowered to -30°C, and 80 ml titanium tetrachloride was added dropwise, followed by 2 ml ethyl acetate and 8 ml ethanol. The temperature was then gradually increased (controlled within the range of 0.2-2°C / min) to 80°C and kept at this temperature for 1 hour. The mother liquor was filtered off, and the mixture was washed multiple times with inert diluent toluene and organic solvent hexane, and then dried to obtain a solid catalyst component with good flowability.

[0145] (2) Polymerization reaction: Same as in Example 1, the polymerization results are shown in Table 1.

[0146] Comparative Example 3

[0147] (1) Preparation of catalyst components:

[0148] Example 1 of Chinese Patent CN114181334A: 4.0 g magnesium chloride, 50 ml toluene, 3.0 ml epichlorohydrin, 9 ml tri-n-butyl phosphate, and 4.4 ml ethanol were added to a reaction vessel and reacted at 70°C for 2 hours. The system was then cooled to -10°C, and 70 ml titanium tetrachloride was slowly added dropwise, followed by 3 ml ethyl acetate. The temperature was gradually increased (controlled within the range of 0.2-2°C / min) to 85°C and held at this temperature for 1 hour. 1 ml 2,2-dimethyl-1,3-diethoxy-propane was added, and the temperature was held at this temperature for another hour. Stirring was stopped, and the mixture was allowed to stand. The suspension quickly separated into layers. The supernatant was removed, and the mixture was washed multiple times with inert diluent toluene and organic solvent hexane, and then dried to obtain a solid catalyst component with good flowability.

[0149] (2) Polymerization reaction: Same as in Example 1, the polymerization results are shown in Table 1.

[0150] Comparative Example 4

[0151] (1) Preparation of catalyst components:

[0152] Example 2 of Chinese Patent CN114181334A: 4.0 g magnesium chloride, 50 ml toluene, 3.0 ml epichlorohydrin, 9 ml tri-n-butyl phosphate, and 4.4 ml ethanol were added to a reaction vessel and reacted at 70°C for 2 hours. The system was then cooled to -10°C, and 70 ml titanium tetrachloride was slowly added dropwise, followed by 3 ml ethyl acetate. The temperature was gradually increased (controlled within the range of 0.2-2°C / min) to 85°C and held at this temperature for 1 hour. 1 ml of 2,2-dimethyl-1-ethoxy-3-methoxy-propane was added, and the temperature was maintained for another hour. Stirring was stopped, and the mixture was allowed to stand. The suspension quickly separated into layers. The supernatant was removed, and the mixture was washed multiple times with inert diluent toluene and organic solvent hexane, and then dried to obtain a solid catalyst component with good flowability.

[0153] (2) Polymerization reaction: Same as in Example 1, the polymerization results are shown in Table 1.

[0154] Comparative Example 5

[0155] (1) Preparation of catalyst components

[0156] Example 1 in Chinese Patent CN114478861A.

[0157] (2) Polymerization reaction: Same as in Example 1, the polymerization results are shown in Table 1.

[0158] Table 1

[0159]

[0160] As shown in Table 1, compared to Comparative Examples 1 and 2 without the addition of an internal electron donor, the catalyst obtained by introducing an internal electron donor into the catalyst in this invention exhibits a more significant increase in activity. Since no alcohol compound was added to the catalyst component of Comparative Example 5, its catalyst activity was relatively poor. Comparative Examples 3 and 4 added alcohol compounds to the solution system, resulting in higher catalyst activity, but this affected particle morphology, leading to poorer particle size distribution, sphericity, and angle of repose. This invention, by introducing an internal electron donor into the catalyst and through the synergistic effect of the various raw material components, yields a catalyst with optimal overall performance.

[0161] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

[0162] All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those skilled in the art. In case of conflict, the definitions in this specification shall prevail.

[0163] When this specification uses the prefixes “known to those skilled in the art,” “prior art,” or similar terms to derive materials, substances, methods, steps, apparatus, or components, the objects derived from such prefixes cover those commonly used in the art at the time of this application’s filing, but also include those that are not currently commonly used but will become generally recognized in the art as suitable for similar purposes.

[0164] The endpoints and any values ​​of the ranges disclosed in this application are not limited to the precise ranges or values; such ranges or values ​​should be understood to include values ​​close to them. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein. In principle, various technical solutions can be combined with each other to obtain new technical solutions, which should also be considered as specifically disclosed herein.

[0165] In the context of this specification, except where expressly stated otherwise, any matters or issues not mentioned shall apply directly to those known in the art without any modification.

[0166] Furthermore, any implementation described herein can be freely combined with one or more other implementations described herein, and the resulting technical solutions or technical ideas shall be regarded as part of the original disclosure or original record of the present invention, and should not be regarded as new content not disclosed or anticipated herein, unless those skilled in the art consider the combination to be obviously unreasonable.

Claims

1. A catalyst component for the polymerization of olefins, characterized by The catalyst component comprises a reaction product of the following components: a magnesium complex, an organic acid anhydride compound, an acetic acid ester compound, an alcohol compound, a titanium-containing compound, and an internal electron donor; the magnesium element in the magnesium complex and the organic acid anhydride compound, the acetic acid ester compound, the alcohol compound, the titanium-containing compound, and the internal electron donor are in a molar ratio of 1:(0.03-1.0):(0.01-5):(0.1-10):(0.5-120):(0.01-1).

2. The catalyst component according to claim 1, wherein: the magnesium element in the magnesium complex and the organic acid anhydride compound, the acetic acid ester compound, the alcohol compound, the titanium-containing compound, and the internal electron donor are in a molar ratio of 1:(0.1-0.3):(0.5-3):(0.1-5.0):(5-20):(0.05-0.20).

3. Catalyst component according to claim 1 or 2, characterized in that The catalyst component comprises a reaction product of the following components: a magnesium complex, an organic acid anhydride compound, an acetic acid ester compound, an alcohol compound, a titanium-containing compound, and an internal electron donor; the magnesium element in the magnesium complex and the organic acid anhydride compound, the acetic acid ester compound, the alcohol compound, the titanium-containing compound, and the internal electron donor are in a molar ratio of 1:(0.03-1.0):(0.01-5):(0.1-10):(0.5-120):(0.01-1).

2. The catalyst component according to claim 1, wherein: the magnesium element in the magnesium complex and the organic acid anhydride compound, the acetic acid ester compound, the alcohol compound, the titanium-containing compound, and the internal electron donor are in a molar ratio of 1:(0.1-0.3):(0.5-3):(0.1-5.0):(5-20):(0.05-0.20). The catalyst component comprises a reaction product of the following components: a magnesium complex, an organic acid anhydride compound, an acetic acid ester compound, an alcohol compound, a titanium-containing compound, and an internal electron donor; the magnesium element in the magnesium complex and the organic acid anhydride compound, the acetic acid ester compound, the alcohol compound, the titanium-containing compound, and the internal electron donor are in a molar ratio of 1:(0.03-1.0):(0.01-5):(0.1-10):(0.5-120):(0.01-1).

4. The catalyst component according to claim 1 or 2, wherein: the internal electron donor has a structural formula of: wherein R1and R6, which can be the same or different, are each independently one of hydrogen, halogen, a C1-C10 linear alkyl group which is substituted or unsubstituted by a halogen atom, a C1-C10 branched alkyl group which is substituted or unsubstituted by a halogen atom, and a C1-C10 alkoxy group which is substituted or unsubstituted by a halogen atom, and are preferably one of methyl, ethyl, halomethyl, and haloethyl; R2, R3, R4, and R5, which can be the same or different, are each independently one of C1-C10 hydrocarbon groups, and are preferably methyl or ethyl; n is any integer from 0 to 10, and is preferably any integer from 0 to 2; and more preferably, the internal electron donor is at least one of the following compounds: Compound A: R1is CH3; R2is CH3; R3is CH3; R4is CH3; R5is CH3; R6is CH3; and n is 0; Compound B: R1is CH3; R2is CH3; R3is CH3; R4is CH3; R5is CH3; R6is CH3; and n is 1; Compound C: R1is CH3; R2is CH3; R3is CH3; R4is CH3; R5is CH3; R6is CH3; and n is 2; Compound D: R1is CH2CH3; R2is CH3; R3is CH3; R4is CH3; R5is CH3; R6is CH3; and n is 0; Compound E: R1is CH2CH3; R2is CH3; R3is CH3; R4is CH3; R5is CH3; R6is CH2CH3; and n is 1; Compound F: R1is ClCH2; R2is CH3; R3is CH3; R4is CH3; R5is CH3; R6is CH2CH3; n is 1 ; Compound G: R1is ClCHCH3; R2is CH3; R3is CH3; R4is CH3; R5is CH3; R6is CH3; n is 1 ; Compound H: R1is ClCHCH3; R2is CH3; R3is CH3; R4is CH3; R5is CH3; R6is CH2CH3; n is 1 ; Compound I: R1is ClCH2; R2is CH3; R3is CH3; R4is CH3; R5is CH3; R6is ClCHCH3; n is 1 ; Compound J: R1is CH3; R2is CH2CH3; R3is CH3; R4is CH3; R5is CH3; R6is CH3; n is 1 ; Compound K: R1is CH3; R2is CH2CH3; R3is CH2CH3; R4is CH3; R5is CH3; R6is CH3; n is 1 ; Compound L: R1is CH3; R2is CH2CH3; R3is CH3; R4is CH2CH3; R5is CH3; R6is CH3; n is 1 ; Compound M: R1is CH3; R2is CH2CH3; R3is CH2CH3; R4is CH2CH3; R5is CH3; R6is CH3; n is 1 ; Compound N: R1is CH3; R2is CH2CH3; R3is CH2CH3; R4is CH2CH3; R5is CH2CH3; R6is CH3; n is 1 ; Compound O: R1is ClCH2; R2is CH2CH3; R3is CH3; R4is CH3; R5is CH3; R6is CH3; n is 1 ; Compound P: R1is ClCH2; R2is CH2CH3; R3is CH2CH3; R4is CH3; R5is CH3; R6is CH3; n is 1 ; Compound Q: R1is ClCH2; R2is CH2CH3; R3is CH3; R4is CH2CH3; R5is CH3; R6is CH3; n is 1 ; Compound R: R1is ClCH2; R2is CH2CH3; R3is CH2CH3; R4is CH2CH3; R5is CH2CH3; R6is CH3; n is 1 ; Compound S: R1is ClCHCH3; R2is CH2CH3; R3is CH2CH3; R4is CH2CH3; R5is CH2CH3; R6is CH3; n is 1.

5. The catalyst component according to claim 3, wherein: the magnesium halide is a dihalogenated magnesium or a complex of a dihalogenated magnesium with at least one of water, an alcohol, an electron donor; preferably, the dihalogenated magnesium is at least one of magnesium dichloride, magnesium dibromide, magnesium difluoride, magnesium diiodide, more preferably magnesium dichloride, and / or the alcohol is at least one of methanol, ethanol, propanol, butanol, pentanol, hexanol, iso-octanol, and / or the electron donor is at least one of ammonia, hydroxylamine, an ether, an ester; and / or, The organic phosphorus compound is at least one of alkyl orthophosphates, halogenated alkyl orthophosphates, alkyl phosphites, halogenated alkyl phosphites, preferably at least one of trimethyl phosphate, triethyl phosphate, tri-n-propyl phosphate, tri-i-propyl phosphate, tri-n-butyl phosphate, tri-i-butyl phosphate, tri-t-butyl phosphate, tri-n-pentyl phosphate, tri-i-pentyl phosphate, tri-n-hexyl phosphate, tri-i-hexyl phosphate, tri-n-heptyl phosphate, tri-i-heptyl phosphate, tri-n-octyl phosphate, tri-i-octyl phosphate, triphenyl phosphate, trimethyl phosphite, triethyl phosphite, tri-n-propyl phosphite, tri-i-propyl phosphite, tri-n-butyl phosphite, tri-i-butyl phosphite, tri-t-butyl phosphite, tri-n-pentyl phosphite, tri-i-pentyl phosphite, tri-n-hexyl phosphite, tri-i-hexyl phosphite, tri-n-heptyl phosphite, tri-i-heptyl phosphite, tri-n-octyl phosphite, tri-i-octyl phosphite, triphenyl phosphite, di-n-butyl phosphite; and / or, The organic phosphorus compound is at least one of alkyl orthophosphates, halogenated alkyl orthophosphates, alkyl phosphites, halogenated alkyl phosphites, preferably at least one of trimethyl phosphate, triethyl phosphate, tri-n-propyl phosphate, tri-i-propyl phosphate, tri-n-butyl phosphate, tri-i-butyl phosphate, tri-t-butyl phosphate, tri-n-pentyl phosphate, tri-i-pentyl phosphate, tri-n-hexyl phosphate, tri-i-hexyl phosphate, tri-n-heptyl phosphate, tri-i-heptyl phosphate, tri-n-octyl phosphate, tri-i-octyl phosphate, triphenyl phosphate, trimethyl phosphite, triethyl phosphite, tri-n-propyl phosphite, tri-i-propyl phosphite, tri-n-butyl phosphite, tri-i-butyl phosphite, tri-t-butyl phosphite, tri-n-pentyl phosphite, tri-i-pentyl phosphite, tri-n-hexyl phosphite, tri-i-hexyl phosphite, tri-n-heptyl phosphite, tri-i-heptyl phosphite, tri-n-octyl phosphate, tri-i-octyl phosphate, triphenyl phosphate, di-n-butyl phosphite; and / or, The inert diluent is an aromatic hydrocarbon compound or an alkane compound; preferably, the aromatic hydrocarbon compound is at least one of benzene and its derivatives, toluene and its derivatives, xylene and its derivatives, monochlorobenzene and its derivatives, dichlorobenzene and its derivatives, trichlorobenzene and its derivatives, monochlorotoluene and its derivatives; and / or, the alkane compound is at least one of C3-C20 straight-chain alkanes, branched alkanes or cycloalkanes, preferably at least one of butane, pentane, hexane, cyclohexane, heptane.

6. The catalyst component according to claim 1 or 2, characterized in that: The structural formula of the organic acid anhydride compound is wherein R5' and R6' can be the same or different, and are each independently hydrogen, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C3-C10 cycloalkyl, C6-C10 aromatic hydrocarbon group, and / or R5' and R6' can be arbitrarily annulated; preferably, the organic acid anhydride compound is at least one of acetic anhydride, propionic anhydride, butyric anhydride, acrylic anhydride, phthalic anhydride, butenyl anhydride, maleic anhydride, and / or, The chemical formula of the acetic ester compound is CH3COOR7, wherein R7 is one of C1-C10 alkyl, C2-C10 alkenyl, C3-C10 cycloalkyl, C2-C10 alkynyl, C6-C10 aromatic hydrocarbon group, preferably at least one of methyl acetate, ethyl acetate, n-propyl acetate, i-propyl acetate, n-butyl acetate, n-pentyl acetate, n-hexyl acetate, n-octyl acetate; and / or, The alcohol compound is a C1-C18 aliphatic alcohol or a C1-C18 aromatic alcohol, preferably at least one of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, t-butanol, hexanol, cyclohexanol, octanol, isooctanol, benzyl alcohol, phenethyl alcohol, ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, isohexylene glycol, more preferably at least one of butanol, isobutanol, t-butanol, hexanol, cyclohexanol, octanol, isooctanol, benzyl alcohol, phenethyl alcohol, butylene glycol, hexylene glycol, isohexylene glycol; and / or, The chemical formula of the titanium-containing compound is Ti(OR8) a X b wherein R8 is a C1-C10 aliphatic or a C1-C10 aromatic hydrocarbon group, preferably one of C1-C6 alkyl, C2-C6 alkenyl, C3-C8 cycloalkyl, C6-C10 aromatic hydrocarbon group; X is a halogen, preferably one of fluorine, chlorine, bromine; a is any integer from 0 to 2, b is any integer from 1 to 4, the sum of a and b is 3 or 4; more preferably, the titanium-containing compound is at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium mono-chloride tri-ethoxide, titanium trichloride, titanium di-chloride di-ethoxide, titanium tri-chloride mono-ethoxide.

7. A process for the preparation of a catalyst component for the polymerization of olefins as claimed in any one of claims 1-6, characterized in that The method comprises: The catalyst component is prepared by contacting a magnesium complex with an organic acid anhydride compound, then adding a titanium-containing compound and an alcohol compound in sequence after cooling, and then adding an internal electron donor after high-temperature treatment after warming, and post-treatment.

8. The method of claim 7, wherein The method comprises: (a) dissolving a magnesium halide in a solvent system containing an organic epoxy compound, an organic phosphorus compound, and optionally an inert diluent to obtain the magnesium complex; (b) contacting the magnesium complex with an organic acid anhydride compound to obtain a first reaction mixture; (c) adding a titanium-containing compound to the first reaction mixture after cooling to obtain a second reaction mixture; (d) continuing to add an alcohol compound, and then obtaining a third reaction mixture after warming; (e) continuing to add an internal electron donor for high-temperature treatment, and then washing after removing unreacted substances and solvents to obtain the catalyst component; wherein an acetate compound and / or an internal electron donor are added in at least one of steps (a), (b), (c), and (d).

9. The method according to claim 7 or 8, wherein: the reaction temperature of the contacting reaction is 50-70°C, and / or the reaction time is 0.5-2 hours; and / or the temperature after cooling is -60°C to -20°C; and / or the reaction temperature of the warming reaction is 75-100°C, and / or the reaction time is 1-4 hours, and / or the warming rate is 0.2-2°C / min; and / or the reaction temperature of the high-temperature treatment is 70-90°C, and / or the reaction time is 0.5-2 hours.

10. The method according to claim 8, wherein: in step (a), the temperature of the dissolution is 50-70°C, and / or the time of the dissolution is 1-3 hours.

11. A catalyst for the polymerization of olefins, characterized in that The catalyst comprises: an organic aluminum compound and the catalyst component according to any one of claims 1-6 or the catalyst component prepared by the method according to any one of claims 7-10; the molar ratio of aluminum in the organic aluminum compound to titanium in the catalyst component is (5-500):1, preferably (20-200):1, and more preferably (50-100):

1.

12. The catalyst according to claim 11, wherein: The chemical formula of the organoaluminum compound is AlR' d X' 3-d wherein R' is hydrogen or a Cl-C20 hydrocarbon group, preferably one of a Cl-C20 alkyl group, a Cl-C20 aralkyl group, a Cl-C20 aryl group, X' is a halogen atom, preferably one of fluorine, chlorine, bromine, and 0 < d < 3; more preferably, the organoaluminum compound is at least one of Al(CH3)3, Al(CH2CH3)3, Al(i-Bu)3, AlH(CH2CH3)2, AlH(i-Bu)2, AlCl(CH2CH3)2, Al2Cl3(CH2CH3)3, AlCl(CH2CH3)2, AlCl2(CH2CH3), and further preferably Al(CH2CH3)3 and / or Al(i-Bu)3.

13. Use of the catalyst according to claim 11 or 12 in the polymerization of an olefin; preferably, the chemical formula of the olefin is CH2=CHR, wherein R is hydrogen or a C1-C6 alkyl group; more preferably, the olefin is at least one of ethylene, propylene, and butylene; and / or the ethylene polymerization is carried out by slurry polymerization or gas phase polymerization; more preferably, the medium of the slurry polymerization is an inert solvent, preferably at least one of saturated aliphatic hydrocarbons and / or aromatic hydrocarbons, more preferably at least one of isobutane, hexane, heptane, cyclohexane, naphtha, raffinate, hydrogenated gasoline, kerosene, benzene, toluene, and xylene; and / or the gas phase polymerization is carried out in the presence of a carrier gas, preferably at least one of nitrogen, hydrogen, and steam; and / or the catalyst is used in the presence of an inert diluent, preferably at least one of saturated aliphatic hydrocarbons and / or aromatic hydrocarbons, more preferably at least one of isobutane, hexane, heptane, cyclohexane, naphtha, raffinate, hydrogenated gasoline, kerosene, benzene, toluene, and xylene; and / or the catalyst is used in the presence of an electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an external electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and / or the catalyst is used in the presence of an internal electron donor, preferably at least one of aliphatic alcohols, aromatic alcohols, and amines; and The product after polymerization of the olefin is an ultra-high molecular weight polyolefin, preferably an ultra-high molecular weight polyethylene; and / or, The reaction pressure for polymerization of the olefin is 0.1-3 MPa, and / or, the reaction temperature is 50-100℃, and / or, the reaction time is 1.5-10 h.

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