Catalyst component for olefin polymerization, catalyst for olefin polymerization, and use thereof

Abstract

The application belongs to the field of catalysts, and discloses a catalyst component for olefin polymerization, a catalyst for olefin polymerization and application of the catalyst. The synthesis raw material of the catalyst carrier for olefin polymerization in the catalyst component for olefin polymerization comprises elemental sulfur, a bismuth source compound, a magnesium halide with a general formula of MgXY, a compound with a general formula of ROH and an oxirane compound; in the general formula MgXY, X is halogen, Y is halogen, C1-C 14 alkyl, C1-C 14 alkoxy, C6-C 14 aryl or C6-C 14 aryloxy; in the general formula ROH, R is C1-C8 linear alkyl, C3-C8 branched alkyl or C3-C8 cycloalkyl; the structure of the oxirane compound is shown in formula (II): wherein R5 and R6 are each independently hydrogen, C1-C5 linear alkyl or C3-C5 branched alkyl, wherein the hydrogen in the alkyl is optionally substituted by a halogen atom; when the catalyst component for olefin polymerization prepared by the application is used for propylene polymerization, the stereospecificity of the catalyst is better, and the catalyst has great industrial application prospect.

Description

Technical Field

[0001] This invention relates to the field of catalyst technology, specifically to a catalyst component for olefin polymerization and its application in olefin polymerization reactions, as well as a catalyst containing the catalyst for olefin polymerization and its application in olefin polymerization reactions, and an olefin polymerization method. Background Technology

[0002] As is well known, electron donors are a crucial component of polyolefin catalysts used in Ziegler-Natta olefin coordination polymerization. They not only enhance the stereoregulation of the catalyst but also improve its activity, eliminating the need for deashing and washing processes. Electron donors can be categorized into internal and external electron donors. In the polyolefin industry, particularly in polypropylene production, four main types of catalysts containing lone pair electrons have been industrialized: ethyl benzoate, phthalates, 2,2-dialkyl-1,3-dimethoxypropane, and succinate. Among these, Ziegler-Natta catalysts using phthalates as internal electron donors are the most widely used. However, the use of diesteryl phthalate in Ziegler-Natta catalysts limits their application. Therefore, 2,2-dialkyl-1,3-dimethoxypropane-type internal electron donors are attracting increasing attention. However, we have found that the stereoregulation ability of catalysts using this 1,3-diether compound as an internal electron donor is still insufficient.

[0003] The particle size of a catalyst also affects its performance, and different polypropylene production processes sometimes require catalysts with different particle sizes. Industrially, when using catalysts to produce polypropylene, it is often desirable to minimize catalyst breakage and reduce the amount of ultrafine powder produced; using small-particle-size catalysts often meets this requirement. Due to limitations in support technology, in the field of spherical catalysts, the average particle size is generally greater than 40 micrometers.

[0004] Therefore, it is of great significance to develop a new catalyst support for olefin polymerization that can overcome the above-mentioned defects of the existing technology. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the catalyst support particle size is large and the stereo orientation ability of the catalyst is insufficient when 1,3 diether compounds are used as internal electron carriers in the catalyst composition in the prior art. The present invention provides a catalyst composition for olefin polymerization and its application in olefin polymerization reaction, as well as a catalyst for olefin polymerization and its application in olefin polymerization reaction and an olefin polymerization method.

[0006] To address the aforementioned technical problems, a first aspect of the present invention provides a catalyst component for olefin polymerization, the catalyst component for olefin polymerization comprising:

[0007] i) Catalyst support for olefin polymerization;

[0008] ii) Titanium compounds;

[0009] iii) 1,3-Diether compounds.

[0010] According to some embodiments of the present invention, the catalyst support for olefin polymerization comprises a compound as shown in structural formula (I) and bismuth:

[0011]

[0012] The bismuth in the catalyst support for olefin polymerization mainly exists in the form of alkoxybismuth halide, such as Bi(OR) x ) j (OR y ) k Cl i Wherein, Rx is an alkyl group, Ry is a halogenated alkyl group, i is 1-2, j is 1 or 0, k is 1 or 0, j and k are not both 0, i+j+k=3; preferably, Rx is a C1-C8 straight-chain alkyl group, a C3-C8 branched alkyl group or a C3-C8 cycloalkyl group, and Ry is a C2-C10 halogenated alkyl group.

[0013] According to some embodiments of the present invention, in the compound shown in formula (I), R1 is a C1-C8 straight-chain alkyl, a C3-C8 branched alkyl, or a C3-C8 cycloalkyl; R2 and R3 may be the same or different, each independently being hydrogen, a C1-C5 straight-chain or C3-C5 branched alkyl, wherein the hydrogen on the alkyl group is optionally substituted by a halogen atom; X is a halogen, preferably chlorine or bromine; m is 0.1-1.9, n is 0.1-1.9, m+n=2, 0 <q≤0.5。

[0014] According to some embodiments of the present invention, the molar ratio of the compound (in molar amount of Mg) and bismuth element in the catalyst support for olefin polymerization is 1:(0.01 to 1), preferably 1:(0.02 to 0.1), for example 1:0.1, 1:0.06, 1:0.02.

[0015] According to some embodiments of the present invention, the average particle size of the catalyst support for olefin polymerization is 10 micrometers to 100 micrometers, preferably 10 micrometers to 40 micrometers; the particle size distribution is less than 1.2, preferably 0.2 to 0.9.

[0016] In this invention, the average particle size and particle size distribution of the catalyst support for olefin polymerization can be measured using a MasterSizer 2000 laser particle size analyzer (manufactured by Malvern Instruments Ltd).

[0017] According to some embodiments of the present invention, the molar ratio of the titanium compound, the catalyst support for olefin polymerization (in molar amounts of Mg), and the 1,3-diether compound is (40-150):(3-12):1, preferably 133.8:5.9:1.

[0018] According to some embodiments of the present invention, the raw materials for the catalyst support for olefin polymerization include bismuth source compounds, elemental sulfur, magnesium halides with the general formula MgXY, compounds with the general formula ROH, and ethylene oxide compounds.

[0019] According to some embodiments of the present invention, in the general formula MgXY, X is a halogen, Y is a halogen, and C1-C 14 Alkyl, C1-C 14 alkoxy groups, C6-C 14 aryl or C6-C 14 aryloxy groups.

[0020] According to some embodiments of the present invention, in the general formula MgXY, X is chlorine or bromine, and Y is chlorine, bromine, C1-C5 alkyl, C1-C5 alkoxy, C6-C 10 aryl or C6-C 10 The aryl group; the C1-C5 alkyl group can be methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, or neopentyl; the C1-C5 alkoxy group can be methoxy, ethoxy, propoxy, isopropoxy, butoxy, or isobutoxy; the C6-C 10 The aryl group can be phenyl, o-tolyl, m-tolyl, p-tolyl, o-ethylphenyl, m-ethylphenyl, p-ethylphenyl, or naphthyl, wherein the C6-C 10 The aryl group can be phenoxy or naphthoxy.

[0021] According to some embodiments of the present invention, the magnesium halide with the general formula MgXY is selected from at least one of magnesium chloride, magnesium bromide, magnesium phenoxychloride, magnesium isopropoxychloride, and magnesium n-butoxychloride. From the perspective of raw material availability, magnesium chloride is preferred.

[0022] According to some embodiments of the present invention, in the general formula ROH, R is a C1-C8 straight-chain alkyl, a C3-C8 branched alkyl, or a C3-C8 cycloalkyl.

[0023] According to some embodiments of the present invention, in the general formula ROH, R is a C1-C8 straight-chain alkyl or a C3-C8 branched alkyl; the C1-C8 straight-chain alkyl or C3-C8 branched alkyl can be methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, hexyl, isohexyl, heptyl, isoheptyl, octyl, or isooctyl.

[0024] According to some embodiments of the present invention, compounds of the general formula ROH are selected from at least one of ethanol, propanol, isopropanol, n-butanol, isobutanol, pentanol, isoamyl alcohol, n-hexanol, n-octanol, and 2-ethylhexanol.

[0025] According to some embodiments of the present invention, the structure of the ethylene oxide compound is shown in formula (II):

[0026]

[0027] In formula (II), R5 and R6 may be the same or different, and each is independently hydrogen, a C1-C5 straight-chain alkyl group or a C3-C5 branched alkyl group, wherein the hydrogen on the alkyl group is optionally replaced by a halogen atom.

[0028] According to some embodiments of the present invention, in formula (II), R5 and R6 may be the same or different, and each is independently hydrogen, a C1-C3 straight-chain alkyl or a C1-C3 haloalkyl.

[0029] According to some embodiments of the present invention, the ethylene oxide compound is selected from at least one of ethylene oxide, propylene oxide, butane oxide, epichlorohydrin, chlorobutane, bromopropane, and bromobutane.

[0030] According to some embodiments of the present invention, the bismuth source compound is selected from bismuth halides.

[0031] According to some embodiments of the present invention, the elemental sulfur can be any subtype of elemental sulfur, including but not limited to at least one of α-sulfur, β-sulfur, γ-sulfur and polymeric sulfur.

[0032] According to some embodiments of the present invention, the elemental sulfur may be anhydrous elemental sulfur or elemental sulfur containing bound water. Both types of elemental sulfur are commercially available.

[0033] According to some embodiments of the present invention, the content of the above-mentioned components in the raw materials for the catalyst support for olefin polymerization can be selected and varied within a wide range. Based on 1 mol of magnesium halide with the general formula MgXY, the amount of bismuth source compound is 0.0001 mol to 1 mol, preferably 0.001 mol to 0.5 mol, more preferably 0.01 mol to 0.3 mol, and most preferably 0.0625 mol to 0.25 mol, for example 0.25 mol, 0.125 mol, or 0.0625 mol; the amount of elemental sulfur is 0.0001 mol to 0.5 mol, preferably 0.1125 mol to 0.375 mol, for example 0.375 mol or 0.1125 mol; the amount of compound with the general formula ROH is 4 mol to 30 mol, preferably 6 mol to 20 mol, more preferably 6 mol to 12 mol, for example 6 mol or 12 mol; and the amount of ethylene oxide compound with the structure shown in formula (II) is 1 mol to 10 mol, preferably 2 mol to 6 mol, for example 2 mol or 6 mol.

[0034] According to some embodiments of the present invention, the catalyst support for olefin polymerization may contain water, the water of which comes from trace amounts of water carried by the raw materials and reaction medium.

[0035] According to some embodiments of the present invention, the method for preparing the catalyst support for olefin polymerization includes the following steps:

[0036] (1) A bismuth source compound, elemental sulfur, magnesium halide with the general formula MgXY, and a compound with the general formula ROH are mixed and heated to obtain a liquid mixture;

[0037] (2) Emulsify the liquid mixture obtained in step (1) and react the emulsion product with ethylene oxide compounds;

[0038] Preferably, step 1) further includes adding an inert liquid medium, mixing, and heating.

[0039] According to some embodiments of the present invention, in step (1), there are no particular limitations on the heating conditions for the mixture of bismuth source compound, elemental sulfur, magnesium halide of general formula MgXY, compound of general formula ROH, and optionally inert liquid medium, as long as the heating conditions are sufficient to melt the magnesium halide of general formula MgXY and react fully with the bismuth source compound and elemental sulfur. Preferably, the heating temperature is 80°C to 120°C, more preferably 80°C to 100°C, for example 82°C, 90°C, 95°C, 100°C; the heating time is 0.5 hours to 5 hours, more preferably 0.5 hours to 3 hours, for example 1 hour, 2 hours.

[0040] According to some embodiments of the present invention, the inert liquid medium can be any liquid medium commonly used in the art that does not chemically interact with reactants and reaction products; preferably, the inert liquid medium is silicone oil and / or an inert liquid hydrocarbon solvent; more preferably, the inert liquid medium is at least one selected from kerosene, paraffin oil, petrolatum oil, white oil, methyl silicone oil, ethyl silicone oil, methylethyl silicone oil, phenyl silicone oil, and methylphenyl silicone oil; the inert liquid medium of the present invention is particularly preferably white oil;

[0041] The amount of the inert liquid medium can be selected based on the amount of magnesium halide with the general formula MgXY; preferably, based on 1 mol of magnesium halide with the general formula MgXY, the amount of the optional inert liquid medium is 0.8L to 10L, preferably 2L to 8L, for example 3.75L.

[0042] According to some embodiments of the present invention, in step (2), the conditions for contacting the emulsion product with the ethylene oxide compound can be any existing conditions capable of forming a catalyst support for olefin polymerization. Preferably, the contacting reaction conditions include: a temperature of 50°C to 120°C, preferably 60°C to 100°C, for example 60°C, 90°C, 95°C, or 100°C; and a time of 20 minutes to 60 minutes, preferably 20 minutes to 50 minutes, for example 20 minutes, 30 minutes, 40 minutes, or 50 minutes.

[0043] According to some embodiments of the present invention, in step (2), the liquid mixture obtained in step (1) can be emulsified using various methods known to those skilled in the art; for example, the liquid mixture can be emulsified by low-speed shearing or high-speed shearing. The stirring rate of the low-speed shearing is typically 400 rpm to 800 rpm. The high-speed shearing method is known to those skilled in the art, such as the high-speed stirring method disclosed in CN1151183C (i.e., stirring the solution containing liquid magnesium halide adduct at a speed of 2000 rpm to 5000 rpm). In addition, the liquid mixture can be emulsified by referring to the methods disclosed in the following patents: CN1267508C discloses a method of rotary dispersion of a solution containing liquid magnesium halide adduct in a hypergravity bed (the rotation speed can be 100 rpm to 3000 rpm); CN1463990A discloses a method of outputting a solution containing liquid magnesium halide adduct in an emulsifier at a speed of 1500 rpm to 8000 rpm; US6020279 discloses a method of emulsifying a solution containing liquid magnesium halide adduct by spraying.

[0044] According to some embodiments of the present invention, in step (2), it is preferable to use a method of adding a surfactant, that is, the method of emulsifying the liquid mixture obtained in step (1) specifically involves contacting the liquid mixture obtained in step (1) with a surfactant;

[0045] The surfactant is selected from at least one of the following: polyvinylpyrrolidone, polyethylene glycol, polyvinyl alcohol, polyacrylic acid, polyacrylate, polyacrylamide, polystyrene sulfonate, naphthalenesulfonic acid formaldehyde condensate, condensed alkylphenyl ether sulfate, condensed alkylphenol polyoxyethylene ether phosphate, oxyalkyl acrylate copolymer modified polyethyleneimine, polymer of 1-dodecyl-4-vinylpyridine bromide, polyvinylbenzyltrimethylamine salt, polyethylene oxide-propylene oxide block copolymer, polyvinylpyrrolidone vinyl acetate copolymer, alkylphenyl polyoxyethylene ether, and polyalkyl methacrylate.

[0046] The amount of surfactant used is aimed at achieving sufficient emulsification, preferably based on 1 mol of magnesium halide with the general formula MgXY, and the amount of surfactant used is preferably 5g to 60g, for example 12.5g.

[0047] According to some embodiments of the present invention, the preparation method of the catalyst support for olefin polymerization described above may further include solid-liquid separation of the product obtained from the contact reaction, washing the solid product, and drying it. The solid-liquid separation can be any existing method capable of separating the solid and liquid phases, such as vacuum filtration, pressure filtration, or centrifugation. Preferably, the solid-liquid separation method is pressure filtration. The present invention does not particularly limit the conditions for pressure filtration, aiming to achieve the most complete separation of the solid and liquid phases possible. The washing can be performed using methods known to those skilled in the art to wash the obtained solid product, for example, using inert hydrocarbon solvents (e.g., pentane, hexane, heptane, petroleum ether, and gasoline). The present invention does not particularly limit the drying conditions; for example, the drying temperature can be 20°C to 70°C, and the drying time can be 0.5 hours to 10 hours. According to some embodiments of the present invention, the drying can be carried out under normal pressure or reduced pressure.

[0048] The inventors of this invention have unexpectedly discovered that by simultaneously using a bismuth source compound and elemental sulfur in the preparation of a catalyst support for olefin polymerization, a small-particle-size catalyst support for olefin polymerization with a novel composition can be obtained through the above method. When this catalyst support for olefin polymerization is used in conjunction with a catalyst for olefin polymerization prepared from a 1,3-diether internal electron donor, the catalyst for olefin polymerization exhibits a higher isotactic index and a higher stereotacticity.

[0049] According to some embodiments of the present invention, the structure of the 1,3-diether compound is shown in formula (III):

[0050]

[0051] Among them, R 21 and R 22 Whether the two are the same or different, they are each independently selected from hydrogen, C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 Aryl or C7-C 20 alkylaryl, R 21 and R 22 The links can be optionally connected in a loop; R 23 and R 24 Whether the two are the same or different, they are each independently selected from C1-C. 10 Straight-chain alkyl or C3-C 10 Branched alkyl groups.

[0052] According to some embodiments of the present invention, the 1,3-diether compound is selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2- 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(p-chlorophenyl)-1,3-dimethoxypropane, 2-(diphenylmethyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, 2,2-dicyclopentyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-Methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2,2-bis(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-methyl-2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-bis(cyclohexylmethyl)-1,3-dimethoxypropane, 2- Isobutyl-2-isopropyl-1,3-dimethoxypropane, 2-(1-methylbutyl)-2-isopropyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, 2-phenyl-2-isopropyl-1,3-dimethoxypropane, 2-phenyl-2-sec-butyl-1,3-dimethoxypropane, 2-benzyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclohexyl-2-sec-butyl-1,3-dimethoxypropane, 2-isopropyl-2- At least one of sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane, and 9,9-dimethoxymethylfluorene.

[0053] According to some embodiments of the present invention, the 1,3-diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane and / or 9,9-dimethoxymethylfluorene.

[0054] A second aspect of the present invention provides a method for preparing a catalyst component for olefin polymerization, the method comprising mixing and stirring a titanium compound and an olefin polymerization catalyst support, heating and adding a 1,3-diether compound, and then performing post-treatment to obtain the catalyst component for olefin polymerization.

[0055] According to some embodiments of the present invention, the mixing temperature is -30°C to 0°C, preferably -20°C to 0°C, for example -20°C.

[0056] According to some embodiments of the present invention, the stirring temperature is -30℃ to 0℃, preferably -20℃ to 0℃, for example -20℃, and the stirring time is 10min to 90min, preferably 10min to 30min, for example 30min.

[0057] According to some embodiments of the present invention, the temperature is raised to 90°C to 120°C, preferably 90°C to 110°C, for example 110°C.

[0058] According to some embodiments of the present invention, after the addition of the 1,3-diether compound, the temperature is maintained at 90°C to 120°C for 10 min to 60 min, preferably at 90°C to 110°C for 10 min to 30 min, for example at 110°C for 30 min.

[0059] According to some embodiments of the present invention, the post-processing includes filtration, washing, and drying processes.

[0060] According to some embodiments of the present invention, the molar ratio of the titanium compound, the catalyst support for olefin polymerization (in molar amounts of Mg), and the 1,3-diether compound is (40-150):(3-12):1, for example 133.8:5.9:1.

[0061] A third aspect of the present invention provides a catalyst for olefin polymerization, said catalyst comprising:

[0062] (1) The catalyst components used for olefin polymerization mentioned above;

[0063] (2) Alkyl aluminum compounds;

[0064] (3) External electron donor compounds.

[0065] According to some embodiments of the present invention, the alkylaluminum compound is a trialkylaluminum compound, wherein the three alkyl groups in the trialkylaluminum compound are the same or different and are each independently selected from unsubstituted or halogenated alkyl groups of C1-C8. Preferably, one or two alkyl groups are optionally substituted with halogens, preferably with chlorine.

[0066] According to some embodiments of the present invention, the alkylaluminum compound is selected from triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, alkylaluminum chloride, Al(n-C6H) 13 3. Al(n-C8H) 17 3. At least one of AlEt2Cl.

[0067] According to some embodiments of the present invention, the external electron donor compound is selected from compounds of general formula R10. a R11 b Si(OR12) c The silicon compound, wherein a is 0, 1 or 2, b is 0, 1 or 2, c is an integer from 1 to 3 and the sum of (a+b+c) is 4; R10, R11 and R12 are the same or different, each independently selected from C1-C18 hydrocarbon groups and optionally contain heteroatoms.

[0068] According to some embodiments of the present invention, the external electron donor compound is selected from compounds of general formula R10. a R11 b Si(OR12) c The silicon compound, wherein a is 1, b is 1, c is 2, at least one of R10 and R11 is selected from branched alkyl, alkenyl, alkylene, cycloalkyl or aryl group having 3-10 carbon atoms, optionally containing heteroatoms, and R12 is selected from C1-C10 alkyl group, preferably methyl.

[0069] According to some embodiments of the present invention, the external electron donor compound is selected from any one of cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, and (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane and (1,1,1-trifluoro-2-propyl)-methyldimethoxysilane.

[0070] A fourth aspect of the present invention provides the application of the above-described catalyst for olefin polymerization in olefin polymerization reactions.

[0071] A fifth aspect of the present invention provides an olefin polymerization method, the method comprising: contacting one or more olefins with the catalyst described above for olefin polymerization under olefin polymerization conditions.

[0072] According to some embodiments of the present invention, the olefin comprises at least one olefin represented by the formula CH2=CHR, wherein R is hydrogen or a C1-C6 straight-chain or branched alkyl group.

[0073] According to some embodiments of the present invention, the olefin includes at least one of ethylene, propylene, 1-n-butene, 1-n-pentene, 1-n-hexene, 1-n-octene, and 4-methyl-1-pentene.

[0074] According to some embodiments of the present invention, the olefin includes at least one selected from ethylene, propylene, 1-n-butene, 1-n-hexene, and 4-methyl-1-pentene.

[0075] According to some embodiments of the present invention, the olefin is propylene.

[0076] According to the olefin polymerization method of the present invention, the olefin polymerization conditions can be conventional conditions in the art.

[0077] According to some embodiments of the present invention, the olefin polymerization conditions include: a temperature of 0°C to 150°C, a time of 0.1 hours to 8 hours, and a pressure of 0.01 MPa to 10 MPa.

[0078] According to some embodiments of the present invention, the olefin polymerization conditions include: a temperature of 50°C to 100°C, a time of 0.5 hours to 3 hours, and a pressure of 0.5 MPa to 5 MPa.

[0079] The amount of the olefin polymerization catalyst can be any of the conventional amounts used in existing olefin catalysts.

[0080] Beneficial effects:

[0081] In the preparation of catalyst support for olefin polymerization, this invention simultaneously adds sulfur and bismuth source compounds. The sulfur and bismuth source compounds can play a role in particle size regulation, making the particle size of the catalyst support for olefin polymerization precipitated in the system smaller. The resulting smaller particle size catalyst support particles for olefin polymerization have good morphology and are basically free of irregular particles. More importantly, when this catalyst support for olefin polymerization uses 1,3 diether compounds as internal electron carriers for olefin polymerization, the isotactic index of the catalyst used for olefin polymerization is high. Detailed Implementation

[0082] The present invention will be further described below with reference to embodiments. However, the present invention is not limited to these embodiments.

[0083] In the examples and comparative examples:

[0084] 1. The average particle size and particle size distribution of the catalyst support for olefin polymerization were determined using a Masters Sizer 2000 particle size analyzer (manufactured by Malvern Instruments Ltd.);

[0085] 2. The morphology of the catalyst support for olefin polymerization was observed using an optical microscope, model Eclipse E200, purchased from Nikon.

[0086] 3. Calculation of catalyst activity for olefin polymerization: Catalyst activity = (mass of prepared polyolefin) / (mass of solid catalyst component) g / g;

[0087] 4. Isotactic index of catalysts used for olefin polymerization: Polymer isotactic index: determined by heptane extraction method: take 2g of dry polymer sample, place it in an extractor and extract with boiling heptane for 6 hours, dry the residue to constant weight, and the ratio of the obtained polymer weight (g) to 2g is the isotactic index.

[0088] I. Preparation of catalyst supports for olefin polymerization

[0089] Example 1

[0090] This embodiment illustrates the catalyst support for olefin polymerization and its preparation method provided by the present invention.

[0091] In a 0.6 L reactor, 0.08 mol (8.0 g) magnesium chloride, 0.96 mol (56 mL) ethanol, 0.03 mol (1 g) α-sulfur, 0.02 mol bismuth chloride, and 1.0 g surfactant polyvinylpyrrolidone were added. The mixture was heated to 90 °C under stirring and reacted at 90 °C for 2 hours. Then, 0.48 mol (38 mL) epichlorohydrin was added, and the mixture was reacted at 90 °C for 30 minutes. The mixture was then filtered under pressure, and the filtered product was washed five times with hexane and then dried under vacuum to obtain catalyst support Z1 for olefin polymerization.

[0092] Based on gas chromatography-mass spectrometry, elemental analysis, and NMR characterization, Z1 contains the following structural formula: Compounds and bismuth element:

[0093] The molar ratio of compound (in terms of the molar amount of Mg) to bismuth in catalyst support Z1 for olefin polymerization is 1:0.1.

[0094] Example 2

[0095] This embodiment illustrates the catalyst support for olefin polymerization and its preparation method provided by the present invention.

[0096] In a 0.6L reactor, 300mL of white oil, 0.08mol (8.0g) of magnesium chloride, 0.48mol (28mL) of ethanol, 0.009mol (0.3g) of β-sulfur, 0.01mol of bismuth chloride, and 1g of surfactant polyvinylpyrrolidone were added. The mixture was heated to 100℃ under stirring and reacted at 100℃ for 1 hour. Then, 0.16mol (12.5mL) of epichlorohydrin was added, and the mixture was reacted at 100℃ for 20 minutes. After pressure filtration, the filter product was washed five times with hexane and then dried under vacuum to obtain catalyst support Z2 for olefin polymerization.

[0097] Based on gas chromatography-mass spectrometry, elemental analysis, and NMR characterization, Z2 contains the following structural formula: Compounds and bismuth element:

[0098] The molar ratio of the compound (in terms of the molar amount of Mg) to bismuth in the catalyst support Z2 for olefin polymerization is 1:0.06.

[0099] Example 3

[0100] This embodiment illustrates the catalyst support for olefin polymerization and its preparation method provided by the present invention.

[0101] In a 0.6 L reactor, 0.08 mol (8.0 g) magnesium chloride, 0.48 mol (59 mL) cyclohexylethanol, 0.009 mol (0.3 g) β-sulfur, 0.01 mol bismuth chloride, and 1 g surfactant polyvinylpyrrolidone were added. The mixture was heated to 82 °C under stirring and reacted at 82 °C for 1 hour. Then, 0.16 mol (12.5 mL) epichlorohydrin was added, and the mixture was reacted at 60 °C for 20 minutes. The mixture was then filtered, and the filtered product was washed five times with hexane and then dried under vacuum to obtain catalyst support Z3 for olefin polymerization.

[0102] Based on gas chromatography-mass spectrometry, elemental analysis, and NMR characterization, Z3 contains the following structural formula: Compounds and bismuth element.

[0103] The molar ratio of compound (in molar amount of Mg) to bismuth in catalyst support Z3 for olefin polymerization is 1:0.06.

[0104] Example 4

[0105] This embodiment illustrates the olefin polymerization catalyst support and its preparation method provided by the present invention.

[0106] In a 0.6 L reactor, 0.08 mol (8.0 g) magnesium chloride, 0.96 mol (56 mL) ethanol, 0.03 mol (1 g) α-sulfur, 0.005 mol bismuth chloride, and 1 g polyvinylpyrrolidone as a surfactant were added. The mixture was heated to 90 °C under stirring and reacted at 90 °C for 2 hours. Then, 0.48 mol (38 mL) epichlorohydrin was added and reacted at 90 °C for 30 minutes. The mixture was then filtered under pressure. The filtered product was washed five times with hexane and finally dried under vacuum to obtain Z4, a spherical support for olefin polymerization catalyst.

[0107] Based on gas chromatography-mass spectrometry, elemental analysis, and NMR characterization, Z4 contains the following structural formula: Compounds and bismuth element.

[0108] In the catalyst support Z4 used for olefin polymerization, the molar ratio of the compound (in terms of the molar amount of Mg) to bismuth is 1:0.02.

[0109] Comparative Example 1

[0110] In a 0.6L reactor, 0.08mol (8.0g) of magnesium chloride, 0.96mol (56mL) of ethanol, and 1g of polyvinylpyrrolidone as a surfactant were added. The mixture was heated to 90℃ under stirring and reacted at 90℃ for 2 hours. Then, 0.48mol (38mL) of epichlorohydrin was added and reacted at 90℃ for 30 minutes. The mixture was then filtered under pressure. The filtered product was washed five times with hexane and finally dried under vacuum to obtain catalyst support DZ1 for olefin polymerization.

[0111] Based on gas chromatography-mass spectrometry, elemental analysis, and NMR characterization, DZ1 contains the structural formula: Compounds.

[0112] Comparative Example 2

[0113] The preparation method described in Example 1 was followed, except that bismuth chloride was not added, and the catalyst support DZ2 for olefin polymerization was finally obtained.

[0114] Based on gas chromatography-mass spectrometry, elemental analysis, and NMR characterization, DZ2 contains the following structural formula: Compounds.

[0115] The average particle size (D50) and particle size distribution ((D90-D10) / D50) of the catalyst supports for olefin polymerization prepared in Examples 1-4 and Comparative Examples 1-2 were measured, and their appearance morphology was observed. The results are shown in Table 1 below:

[0116] Table 1

[0117]

[0118] As can be seen from the results in Table 1 above, when preparing the catalyst support for olefin polymerization, the present invention uses both bismuth source compound and elemental sulfur. Through the above method, a catalyst support for olefin polymerization with a novel composition can be prepared. Compared with the catalyst support for olefin polymerization in Comparative Example 1 that does not contain bismuth source compound and elemental sulfur, it has a smaller average particle size and particle size distribution. Furthermore, the prepared catalyst support for olefin polymerization has good particle morphology and basically no heterogeneous particles.

[0119] II. Preparation of catalyst components for olefin polymerization and propylene polymerization reaction

[0120] Example 5

[0121] This example illustrates the use of the catalyst support for olefin polymerization of the present invention in the preparation of polyolefins.

[0122] (1) Preparation of catalyst components for olefin polymerization

[0123] In a 300 mL glass reaction flask, 0.91 mol of titanium tetrachloride was added and cooled to -20 °C. Then, 0.04 mol of the catalyst support Z1 for olefin polymerization obtained in Example 1 was added, and the mixture was stirred at -20 °C for 30 min. After that, the temperature was slowly increased to 110 °C, and 6.8 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was added during the heating process. The mixture was then maintained at 110 °C for 30 min, and the liquid was filtered off. The mixture was then washed twice with titanium tetrachloride, and finally washed three times with hexane. After drying, the catalyst component for olefin polymerization was obtained.

[0124] (3) Propylene polymerization reaction

[0125] In a 5L stainless steel high-pressure reactor, nitrogen gas was used for purging. Then, 1 mmol of triethylaluminum hexane solution (concentration of triethylaluminum was 0.5 mmol / mL), 0.05 mmol of methylcyclohexyldimethoxysilane, 10 mL of anhydrous hexane, 10 mg of the catalyst component for olefin polymerization obtained in step (1) above, 1.5 L (standard volume) of hydrogen and 2.5 L of liquid propylene were introduced into the nitrogen gas flow. The temperature was raised to 70°C and the polymerization reaction was carried out at this temperature for 1 hour. After that, the temperature was lowered, the pressure was released, and the material was discharged and dried to obtain polypropylene powder.

[0126] Example 6

[0127] This example illustrates the use of the catalyst support for olefin polymerization of the present invention in the preparation of polyolefins.

[0128] Propylene polymerization was carried out according to the method of Example 5, except that the 1.5L (standard volume) of hydrogen was replaced with 6.5L (standard volume) of hydrogen to obtain a catalyst component for olefin polymerization and polypropylene powder.

[0129] Example 7

[0130] This example illustrates the use of the catalyst support for olefin polymerization of the present invention in the preparation of polyolefins.

[0131] Propylene polymerization was carried out according to the method of Example 5, except that the catalyst support Z1 for olefin polymerization was replaced by the catalyst support Z2 for olefin polymerization obtained in Example 2, to obtain catalyst components and polypropylene powder for olefin polymerization.

[0132] Example 8

[0133] This example illustrates the use of the catalyst support for olefin polymerization of the present invention in the preparation of polyolefins.

[0134] Propylene polymerization was carried out according to the method of Example 7, except that the 1.5L (standard volume) of hydrogen was replaced with 6.5L (standard volume) of hydrogen to obtain a catalyst component for olefin polymerization and polypropylene powder.

[0135] Example 9

[0136] This example illustrates the use of the catalyst support for olefin polymerization of the present invention in the preparation of polyolefins.

[0137] Propylene polymerization was carried out according to the method of Example 5, except that the catalyst support Z1 for olefin polymerization was replaced by the catalyst support Z3 for olefin polymerization obtained in Example 3, to obtain catalyst components and polypropylene powder for olefin polymerization.

[0138] Example 10

[0139] This example illustrates the use of the catalyst support for olefin polymerization of the present invention in the preparation of polyolefins.

[0140] Propylene polymerization was carried out according to the method of Example 9, except that the 1.5L (standard volume) of hydrogen was replaced with 6.5L (standard volume) of hydrogen to obtain a catalyst component for olefin polymerization and polypropylene powder.

[0141] Example 11

[0142] This example illustrates the use of the catalyst support for olefin polymerization of the present invention in the preparation of polyolefins.

[0143] Propylene polymerization was carried out according to the method of Example 5, except that the catalyst support Z1 for olefin polymerization was replaced by the catalyst support Z4 for olefin polymerization obtained in Example 4, to obtain catalyst components and polypropylene powder for olefin polymerization.

[0144] Example 12

[0145] This example illustrates the use of the catalyst support for olefin polymerization of the present invention in the preparation of polyolefins.

[0146] Propylene polymerization was carried out according to the method of Example 11, except that the 1.5L (standard volume) of hydrogen was replaced with 6.5L (standard volume) of hydrogen to obtain a catalyst component for olefin polymerization and polypropylene powder.

[0147] Comparative Example 3

[0148] Propylene polymerization was carried out according to the method of Example 5, except that the catalyst support Z1 for olefin polymerization was replaced by the catalyst support DZ1 for olefin polymerization obtained in Comparative Example 1, to obtain catalyst components and polypropylene powder for olefin polymerization.

[0149] Comparative Example 4

[0150] Propylene polymerization was carried out according to the method of Comparative Example 3, except that the catalyst support Z1 for olefin polymerization was replaced by the catalyst support DZ2 for olefin polymerization obtained in Comparative Example 2, to obtain catalyst components and polypropylene powder for olefin polymerization.

[0151] The catalyst components for olefin polymerization prepared in Examples 5-12 and Comparative Examples 3-4 were used in propylene polymerization. The catalytic activity of the catalysts for olefin polymerization in Examples 5-12 and Comparative Examples 3-4 was calculated after 1 hour of polymerization. The isotactic index of the catalysts for olefin polymerization in Examples 5-12 and Comparative Examples 3-4 was measured, and the appearance of the prepared polypropylene powder was observed. The results are shown in Table 2 below.

[0152] Table 2

[0153]

[0154] As can be seen from the results in Table 2, when the catalysts prepared using the catalyst supports for olefin polymerization described in Examples 1-4 of this invention were used for olefin (especially propylene) polymerization in Examples 5-12, the resulting polypropylene powder particles had good morphology and were basically free of irregularly shaped particles. Furthermore, the stereotacticity of the catalysts used for olefin polymerization was better. However, when the catalyst prepared using the catalyst support for olefin polymerization described in Comparative Example 1 in Comparative Example 3 was used for olefin (especially propylene) polymerization, the resulting polypropylene powder particles contained irregularly shaped particles and had poor flowability. When the catalyst prepared using the catalyst support for olefin polymerization described in Comparative Example 2 in Comparative Example 4 was used for olefin (especially propylene) polymerization, the resulting polypropylene powder particles had good morphology and were basically free of irregularly shaped particles. However, the catalytic activity and isotactic index were slightly lower than those of the catalysts prepared in Examples 5-12.

[0155] 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.

Claims

1. A catalyst component for the polymerization of olefins, characterized by, The catalyst component for olefin polymerization includes: i) Catalyst support for olefin polymerization; ii) Titanium compounds; iii) 1,3-diether compounds; The catalyst support for olefin polymerization comprises a compound as shown in structural formula (I) and bismuth: （I）； In the compound shown in formula (I), R1 is a C1-C8 straight-chain alkyl, C3-C8 branched alkyl, or C3-C8 cycloalkyl; R2 and R3 may be the same or different, each being independently hydrogen, a C1-C5 straight-chain alkyl, or a C3-C5 branched alkyl, wherein the hydrogen atom on the alkyl group is optionally substituted by a halogen atom; X is a halogen; m is 0.1-1.9, n is 0.1-1.9, m+n=2, 0 <q≤0.5; The bismuth element in the catalyst support for olefin polymerization exists in the form of alkoxybismuth halide, and the general structural formula of alkoxybismuth halide is Bi(OR). x ) j (OR y ) k Cl i , where R x It is an alkyl group, R y For alkyl halides, i is 1-2, j is 1 or 0, k is 1 or 0, j and k are not both 0, i+j+k=3; The structures of the 1,3-diether compounds are shown in formula (III): Formula (III) Among them, R 21 and R 22 Whether the two are the same or different, they are each independently selected from hydrogen, C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 Aryl or C7-C 20 alkylaryl, R 21 and R 22 The links can be optionally connected in a loop; R 23 and R 24 Whether the two are the same or different, they are each independently selected from C1-C. 10 Straight-chain alkyl, C3-C 10 Branched alkyl groups; The molar ratio of the compound shown in structural formula (I) to bismuth in the catalyst support for olefin polymerization is 1:(0.01~1), wherein the compound shown in structural formula (I) is in the molar amount of Mg. The molar ratio of the titanium compound, the catalyst support for olefin polymerization, and the 1,3-diether compound is (40-150):(3-12):1, wherein the catalyst support for olefin polymerization is expressed in molar amounts of Mg.

2. The catalyst component for olefin polymerization according to claim 1, characterized in that, In the compound shown in formula (I), X is chlorine or bromine; And / or, the molar ratio of the compound as shown in structural formula (I) to bismuth in the catalyst support for olefin polymerization is 1:(0.02 to 0.1), wherein the compound as shown in structural formula (I) is in the molar amount of Mg.

3. The catalyst component for olefin polymerization according to claim 1, characterized in that, The average particle size of the catalyst support for olefin polymerization is 10 micrometers to 100 micrometers. The particle size distribution of the catalyst support for olefin polymerization is less than 1.

2.

4. The catalyst component for olefin polymerization according to claim 3, characterized in that, The average particle size of the catalyst support for olefin polymerization is 10 micrometers to 40 micrometers. And / or, the particle size distribution of the catalyst support for olefin polymerization is 0.2 to 0.

9.

5. The catalyst component for olefin polymerization according to any one of claims 1-4, characterized in that, The raw materials for the catalyst support used in olefin polymerization include bismuth source compounds, elemental sulfur, magnesium halides with the general formula MgXY, compounds with the general formula ROH, and ethylene oxide compounds. in the general formula MgXY, X is halogen and Y is halogen, C1-C 14 alkyl, C1-C 14 alkoxy, C6-C 14 aryl or C6-C 14 aryloxy; In the general formula ROH, R is a C1-C8 straight-chain alkyl, a C3-C8 branched alkyl, or a C3-C8 cycloalkyl; The structure of the ethylene oxide compounds is shown in formula (II): (II); In formula (II), R5 and R6 may be the same or different, and each is independently hydrogen, a C1-C5 straight-chain alkyl or a C3-C5 branched alkyl, wherein the hydrogen on the alkyl group is optionally replaced by a halogen atom.

6. The catalyst component for olefin polymerization according to claim 5, characterized in that, in the general formula MgXY, X is chlorine or bromine, Y is chlorine, bromine, C1-C5 alkyl, C1-C5 alkoxy, C6-C 10 aryl or C6-C 10 aryloxy; In the general formula ROH, R is a C1-C8 straight-chain alkyl group or a C3-C8 branched alkyl group; The structure of the ethylene oxide compounds is shown in formula (II): (II); In formula (II), R5 and R6 may be the same or different, and each is independently a hydrogen, C1-C3 straight-chain alkyl group, wherein the hydrogen on the alkyl group is optionally replaced by a halogen atom; The bismuth source compound is selected from bismuth halides; The elemental sulfur includes at least one of α-sulfur, β-sulfur, γ-sulfur, and polymeric sulfur; In the raw materials for the synthesis of the catalyst support for olefin polymerization, based on 1 mol of magnesium halide with the general formula MgXY, the amount of bismuth source compound is 0.0001 mol to 1 mol; the amount of elemental sulfur is 0.0001 mol to 0.5 mol; the amount of compound with the general formula ROH is 4 mol to 30 mol; and the amount of ethylene oxide compound with the structure shown in formula (II) is 1 mol to 10 mol.

7. The catalyst component for olefin polymerization according to claim 6, characterized in that, Magnesium halides with the general formula MgXY are selected from at least one of magnesium chloride, magnesium bromide, magnesium phenoxy chloride, magnesium isopropoxy chloride, and magnesium n-butoxy chloride. And / or, compounds of the general formula ROH are selected from at least one of ethanol, propanol, isopropanol, n-butanol, isobutanol, pentanol, isoamyl alcohol, n-hexanol, n-octanol, and 2-ethylhexanol; And / or, the ethylene oxide compound is selected from at least one of ethylene oxide, propylene oxide, butane oxide, epichlorohydrin, chlorobutane, bromopropane, and bromobutane. And / or, in the raw materials for the synthesis of the catalyst support for olefin polymerization, based on 1 mol of magnesium halide with the general formula MgXY, the amount of bismuth source compound is 0.001 mol to 0.5 mol; and / or, the amount of elemental sulfur is 0.1125 mol to 0.375 mol; and / or, the amount of compound with the general formula ROH is 6 mol to 20 mol; and / or, the amount of ethylene oxide compound with the structure shown in formula (II) is 2 mol to 6 mol.

8. The catalyst component for olefin polymerization according to claim 7, characterized in that, In the raw materials for the catalyst support used in olefin polymerization, based on 1 mol of magnesium halide with the general formula MgXY, the amount of bismuth source compound is 0.01 mol to 0.3 mol; and / or, the amount of compound with the general formula ROH is 6 mol to 12 mol.

9. The catalyst component for olefin polymerization according to claim 8, characterized in that, In the raw materials for the synthesis of the catalyst support for olefin polymerization, based on 1 mol of magnesium halide with the general formula MgXY, the amount of bismuth source compound is 0.0625 mol to 0.25 mol.

10. The catalyst component for olefin polymerization according to claim 5, characterized in that, The method for preparing the catalyst support for olefin polymerization includes the following steps: (1) Mix and heat a bismuth source compound, elemental sulfur, magnesium halide with the general formula MgXY and a compound with the general formula ROH to obtain a liquid mixture; (2) Emulsify the liquid mixture obtained in step (1) and react the emulsion with ethylene oxide compounds.

11. The catalyst component for olefin polymerization according to claim 10, characterized in that, Step (1) further includes adding an inert liquid medium, mixing, and heating.

12. The catalyst component for olefin polymerization according to claim 11, characterized in that, In step (1), the heating temperature is 80℃~120℃; the heating time is 0.5 hours~5 hours; And / or, the inert liquid medium is silicone oil and / or an inert liquid hydrocarbon solvent; And / or, based on 1 mol of magnesium halide with the general formula MgXY, the amount of the inert liquid medium is 0.8 L to 10 L.

13. The catalyst component for olefin polymerization according to claim 12, characterized in that, In step (1), the heating temperature is 80℃~100℃; and / or, the heating time is 0.5 hours~3 hours; And / or, the inert liquid medium is at least one of kerosene, paraffin oil, petrolatum oil, white oil, methyl silicone oil, ethyl silicone oil, methyl ethyl silicone oil, phenyl silicone oil, and methyl phenyl silicone oil; And / or, based on 1 mol of magnesium halide with the general formula MgXY, the amount of the inert liquid medium is 2 L to 8 L.

14. The catalyst component for olefin polymerization according to claim 10 or 11, characterized in that, In step (2), the conditions for the contact reaction include: a temperature of 50°C to 120°C and a time of 20 to 60 minutes; The method for emulsifying the liquid mixture obtained in step (1) specifically involves contacting the liquid mixture obtained in step (1) with a surfactant to emulsify it. Based on 1 mol of magnesium halide with the general formula MgXY, the amount of the surfactant used is 5 g to 60 g.

15. The catalyst component for olefin polymerization according to claim 14, characterized in that, In step (2), the conditions for the contact reaction include: a temperature of 60°C to 100°C; and / or a time of 20 minutes to 50 minutes; And / or, the surfactant is selected from at least one of polyvinylpyrrolidone, polyethylene glycol, polyvinyl alcohol, polyacrylic acid, polyacrylate, polyacrylamide, polystyrene sulfonate, naphthalenesulfonic acid formaldehyde condensate, condensed alkylphenyl ether sulfate, condensed alkylphenol polyoxyethylene ether phosphate, oxyalkyl acrylate copolymer modified polyethyleneimine, polymer of 1-dodecyl-4-vinylpyridine bromide, polyvinylbenzyltrimethylamine salt, polyethylene oxide propylene oxide block copolymer, polyvinylpyrrolidone vinyl acetate copolymer, alkylphenyl polyoxyethylene ether, and polyalkyl methacrylate; And / or, based on 1 mol of magnesium halide with the general formula MgXY, the amount of the surfactant is 10 g to 15 g.

16. The catalyst component for olefin polymerization according to any one of claims 1-4, characterized in that, The 1,3-diether compounds are selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2-phenylethyl)-1,3-dimethoxypropane, 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(diphenylmethyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, and 2,2-dicyclopentyl-1,3-dimethoxypropane. Propane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2,2-bis(2-cyclohexylethyl) -1,3-Dimethoxypropane, 2-Methyl-2-isobutyl-1,3-dimethoxypropane, 2-Methyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-bis(cyclohexylmethyl)-1,3-dimethoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2-(1-methylbutyl)-2-isopropyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, 2-phenyl- At least one of 2-isopropyl-1,3-dimethoxypropane, 2-phenyl-2-sec-butyl-1,3-dimethoxypropane, 2-benzyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclohexyl-2-sec-butyl-1,3-dimethoxypropane, 2-isopropyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane, and 9,9-dimethoxymethylfluorene.

17. The catalyst component for olefin polymerization according to claim 16, characterized in that, The 1,3-diether compounds are 2-isopropyl-2-isopentyl-1,3-dimethoxypropane and / or 9,9-dimethoxymethylfluorene.

18. A method for preparing a catalyst component for olefin polymerization as described in any one of claims 1-17, characterized in that, The preparation method includes mixing and stirring a titanium compound and a catalyst support for olefin polymerization, heating and adding a 1,3-diether compound, and then performing post-treatment to obtain the catalyst component for olefin polymerization.

19. The preparation method according to claim 18, characterized in that, The mixing temperature is -30℃ to 0℃; And / or, the stirring temperature is -30℃ to 0℃, and the stirring time is 10 min to 90 min; And / or, the temperature is raised to 90°C to 120°C; And / or, after adding the 1,3-diether compound, the temperature is maintained at 90°C to 120°C for 10 min to 60 min; And / or, the post-processing includes filtration, washing, and drying.

20. The preparation method according to claim 19, characterized in that, The mixing temperature is -20℃ to 0℃; And / or, the stirring temperature is -20℃ to 0℃, and / or, the stirring time is 10 min to 30 min; And / or, the temperature is raised to 90°C to 110°C; And / or, after adding the 1,3-diether compound, the temperature is maintained at 90°C to 110°C for 10 min to 30 min.

21. A catalyst for olefin polymerization, characterized in that, The catalyst for olefin polymerization contains: (1) The catalyst component for olefin polymerization according to any one of claims 1-17 or the catalyst component for olefin polymerization prepared by the preparation method according to any one of claims 18-20; (2) Alkyl aluminum compounds; (3) External electron donor compounds.

22. The catalyst according to claim 21, characterized in that, The alkylaluminum compound is a trialkylaluminum compound, wherein the three alkyl groups in the trialkylaluminum compound are the same or different, and each is independently selected from unsubstituted or halogenated alkyl groups of C1-C8. And / or, the external electron donor compound is selected from the general formula R10. a R11 b Si (OR12) c The silicon compound, wherein a is 0, 1 or 2, b is 0, 1 or 2, c is an integer from 1 to 3 and the sum of (a+b+c) is 4; R10, R11 and R12 are the same or different, each independently selected from C1-C18 hydrocarbon groups and optionally contain heteroatoms.

23. The catalyst according to claim 22, characterized in that, One or two alkyl groups in the trialkylaluminum compound may optionally be substituted with halogens; And / or, the external electron donor compound is selected from the general formula R10. a R11 b Si (OR12) c The silicon compound wherein a is 1, b is 1, c is 2, at least one of R10 and R11 is selected from branched alkyl, alkenyl, alkylene, cycloalkyl or aryl group having 3-10 carbon atoms, optionally containing heteroatoms, and R12 is selected from C1-C10 alkyl group.

24. The catalyst according to claim 23, characterized in that, One or two alkyl groups in the trialkylaluminum compound may optionally be substituted with chlorine; And / or, the external electron donor compound is selected from the general formula R10. a R11 b Si (OR12) c The silicon compound wherein a is 1, b is 1, c is 2, at least one of R10 and R11 is selected from branched alkyl, alkenyl, alkylene, cycloalkyl or aryl group having 3-10 carbon atoms, optionally containing heteroatoms, and R12 is selected from methyl.

25. The catalyst according to claim 22, characterized in that, said alkyl aluminium compound is selected from the group consisting of triethylaluminium, triisobutylaluminium, tri-n-butylaluminium, tri-n-hexylaluminium, chlorinated alkylaluminium, Al(n-C6H 13 )3, Al(n-C8H 17 )3, AlEt2Cl; And / or, the external electron donor compound is selected from any one of cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, and (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane and (1,1,1-trifluoro-2-propyl)-methyldimethoxysilane.

26. The use of a catalyst for olefin polymerization as described in any one of claims 21-25 in an olefin polymerization reaction.

27. A method for olefin polymerization, characterized in that, The method comprises: contacting one or more olefins with a catalyst for olefin polymerization as described in any one of claims 21-25 under olefin polymerization conditions.

28. The olefin polymerization method according to claim 27, characterized in that, The olefin includes at least one olefin represented by the formula CH2=CHR, wherein R is hydrogen or a C1-C6 straight-chain or branched alkyl group.

29. The olefin polymerization method according to claim 28, characterized in that, The olefins include at least one of ethylene, propylene, 1-n-butene, 1-n-pentene, 1-n-hexene, 1-n-octene, and 4-methyl-1-pentene.

30. The olefin polymerization method according to claim 29, characterized in that, The olefin includes at least one selected from ethylene, propylene, 1-n-butene, 1-n-hexene, and 4-methyl-1-pentene.

31. The olefin polymerization method according to claim 30, characterized in that, The olefin is propylene.

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