A catalyst component for the polymerization of olefins, a catalyst and use thereof

Abstract

The application provides a catalyst component for olefin polymerization, a catalyst and application thereof, and belongs to the technical field of olefin polymerization. The catalyst component contains a reaction product of the following components: (1) a magnesium-containing solid component; (2) at least one titanium-containing compound; and (3) an internal electron donor; wherein the internal electron donor contains a furan compound and a diether compound; and the magnesium-containing solid component is a magnesium-containing compound shown in formula (I). The catalyst component has a narrow particle size distribution, the catalyst has high hydrogen regulation sensitivity and good polymerization activity, the prepared polymer has low fine powder content when the catalyst is used for olefin polymerization, and the catalyst component does not contain phthalate compounds (plasticizers).

Description

TECHNICAL FIELD

[0001] The present application relates to the field of olefin polymerization, in particular to a catalyst component for olefin polymerization, a catalyst comprising the catalyst component, and the application of the catalyst in olefin polymerization. BACKGROUND

[0002] Catalysts are the core of polyolefin technology, and the progress of which drives the progress of polyolefin technology. The fourth generation of Ziegler-Natta catalysts is the mainstream of commercial catalysts, and the internal electron donor is phthalate compounds. However, it has been found that phthalate compounds can cause serious damage to the growth and reproductive system of animals, and may also have similar effects on humans.

[0003] High flow polypropylene is one of the main development directions of polypropylene in the future due to its good processing performance. In order to obtain olefin polymers with high melt flow rate, a large amount of hydrogen needs to be added during polymerization, thereby making the polymer low molecular. However, the upper limit of the amount of hydrogen that can be added is limited by the pressure resistance of the polymerization reactor. In order to add more hydrogen, the partial pressure of the olefin gas for polymerization has to be reduced, which reduces the productivity in this case.

[0004] In addition, attention should also be paid to whether a large amount of fine powder is produced after olefin polymerization. If there is too much fine powder in the polymer, it will bring risks to the stable operation of the polymerization device.

[0005] Therefore, it is urgent to develop a catalyst with high hydrogen sensitivity in a non-plasticizer form, which should also maintain appropriate polymerization activity and produce polymers with low fine powder content, thereby having good application performance. SUMMARY

[0006] An object of the present application is to provide a catalyst component for olefin polymerization and a preparation method thereof, which has a narrow particle size distribution, high hydrogen sensitivity, and high polymerization activity, and does not contain phthalate compounds (plasticizer).

[0007] Another object of the present application is to provide a catalyst comprising the above-mentioned catalyst component for olefin polymerization and the application thereof in olefin polymerization. When the catalyst is used for propylene polymerization, the prepared polymer has low fine powder content.

[0008] Specifically, the present application provides a catalyst component for olefin polymerization, which comprises the reaction product of the following components:

[0009] (1) a magnesium-containing solid component;

[0010] (2) at least one titanium-containing compound; and

[0011] (3) an internal electron donor;

[0012] wherein the internal electron donor contains a furan compound and a diether compound;

[0013] the magnesium-containing solid component is a magnesium-containing compound represented by formula (I) :

[0014]

[0015] In formula (I), R1 is a linear or branched alkyl group having 1 to 6 carbon atoms; R2 and R3 are the same or different, and each independently is hydrogen or a linear or branched alkyl group having 1 to 5 carbon atoms, wherein the hydrogen in the alkyl group is optionally substituted with a halogen atom; X is chlorine or bromine; m is 0.1 to 1.9, n is 0.1 to 1.9, m + n = 2, and 0 < q ≤ 0.5.

[0016] The present application also provides a preparation method of the above-mentioned catalyst component for olefin polymerization.

[0017] The present application also provides a catalyst for olefin polymerization, which contains:

[0018] (i) a catalyst component, which is at least one of the above-mentioned catalyst components for olefin polymerization;

[0019] (ii) at least one aluminum alkyl compound; and

[0020] (iii) an optional external electron donor.

[0021] The present application also provides the use of the above-mentioned catalyst for olefin polymerization in an olefin polymerization reaction.

[0022] The present application also provides a preparation method of the above-mentioned catalyst component for olefin polymerization.

[0023] Other features and advantages of the present application will be illustrated in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1An optical microscope image of the olefin polymerization catalyst support Z1 obtained in Preparation Example 1 of the present application. DETAILED DESCRIPTION

[0025] The specific embodiments of the present application are described in detail below. It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the application, are given by way of illustration only, and are not by way of limitation.

[0026] The present application provides a catalyst component for olefin polymerization, which contains the reaction product of the following components:

[0027] (1) a magnesium-containing solid component;

[0028] (2) at least one titanium-containing compound; and

[0029] (3) an internal electron donor;

[0030] wherein the internal electron donor contains a furan compound and a diether compound;

[0031] The magnesium-containing solid component has a structure represented by formula (I):

[0032]

[0033] In formula (I), R1 is a linear or branched alkyl group having 1 to 6 carbon atoms; R2 and R3 are the same or different, and are independently hydrogen or a linear or branched alkyl group having 1 to 5 carbon atoms, wherein the hydrogen of the alkyl group can be optionally substituted with a halogen atom; X is chlorine or bromine; m is 0.1 to 1.9, n is 0.1 to 1.9, m+n=2, and 0<q≤0.5.

[0034] The synthesis raw material of the magnesium-containing solid component contains sulfur, a magnesium halide having the general formula MgXY, a compound having the general formula ROH, and an oxirane compound; in the general formula MgXY, X is a halogen and Y is a halogen or an alkyl group having 1 to 6 carbon atoms; in the general formula ROH, R is an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 3 to 8 carbon atoms; and the oxirane compound has a structure represented by formula (II):

[0035]

[0036] wherein R5 and R6 are each independently hydrogen, an alkyl group having 1 to 5 carbon atoms, or a halogenated alkyl group having 1 to 5 carbon atoms.

[0037] According to the present application, the content of each of the above components in the magnesium-containing solid component can be selected and varied within a wide range, for example, wherein the amount of sulfur is 0.0001 to 0.1 mol, the amount of the compound of the general formula ROH is 4 to 30 mol, and the amount of the oxirane compound having the structure represented by the formula (II) is 1 to 10 mol, based on 1 mol of the magnesium halide of the general formula MgXY; preferably, the amount of the compound of the general formula ROH is 6 to 20 mol, and the amount of the oxirane compound having the structure represented by the formula (II) is 2 to 6 mol, based on 1 mol of the magnesium halide of the general formula MgXY.

[0038] According to the present application, the sulfur is anhydrous sulfur or sulfur containing crystal water, is sulfur or brominated sulfur or iodized sulfur, and is preferably sulfur.

[0039] According to the present application, in the general formula MgXY, X is preferably chlorine or bromine, and Y is preferably chlorine, bromine, a C1 to C5 alkyl group, a C1 to C5 alkoxy group, a C6 to C 10 aryl group, or a C6 to C 10 aryloxy group; the C1 to C5 alkyl group can be, for example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, an isobutyl group, a t-butyl group, an n-pentyl group, an isopentyl group, a t-pentyl group, or a neopentyl group; the C1 to C5 alkoxy group can be, for example, a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, or an isobutoxy group; the C6 to C 10 aryl group can be, for example, a phenyl group, an o-tolyl group, an m-tolyl group, a p-tolyl group, an o-ethylphenyl group, an m-ethylphenyl group, a p-ethylphenyl group, or a naphthyl group; and the C6 to C 10 aryloxy group can be, for example, a phenoxy group or a naphthoxy group.

[0040] The magnesium halide of the general formula MgXY can be one magnesium halide or a mixture of a plurality of magnesium halides. Specific examples of the magnesium halide of the general formula MgXY can be, but are not limited to, one or more of magnesium chloride, magnesium bromide, phenyloxy magnesium chloride, isopropyloxy magnesium chloride, and n-butyloxy magnesium chloride. From the viewpoint of ease of availability of raw materials, magnesium chloride is preferred.

[0041] According to the present application, in the general formula ROH, R is preferably a C1 to C8 alkyl group; the C1 to C8 alkyl group can be, for example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, an isobutyl group, a t-butyl group, an n-pentyl group, an isopentyl group, a t-pentyl group, a neopentyl group, a hexyl group, an isohexyl group, a heptyl group, an isohexyl group, an octyl group, or an isooctyl group. Specific examples of the compound of the general formula ROH can be, but are not limited to, one or more of ethanol, propanol, isopropanol, n-butanol, isobutanol, pentanol, isopentanol, n-hexanol, n-octanol, and 2-ethylhexanol.

[0042] According to the present application, in the oxirane compound having a structure represented by formula (II), R5and R6are each independently hydrogen, C1-C3 alkyl group or C1-C3 haloalkyl group. Specific examples of the oxirane compound can include, but are not limited to, one or more of oxirane, oxetane, butylene oxide, epichlorohydrin, epichlorobutane, epibromohydrin and epibromobutane.

[0043] According to a preferred embodiment of the present application, the average particle diameter of the magnesium-containing solid component is preferably 12-30 microns, and the particle size distribution is less than 1.2, preferably 0.2-0.8. In the present application, the average particle diameter and the particle size distribution of the olefin polymerization catalyst support (the magnesium-containing solid component) can be measured by using a Master Sizer 2000 laser particle size analyzer (manufactured by Malvern Instruments Ltd.).

[0044] According to the present application, the water contained in the olefin polymerization catalyst support is derived from trace amounts of water contained in the synthesis raw materials and the reaction medium.

[0045] The method for preparing the olefin polymerization catalyst support according to the present application comprises the following steps:

[0046] (a) mixing and heating sulfur, a magnesium halide having a general formula of MgXY, a compound having a general formula of ROH, and an optional inert liquid medium to obtain a liquid mixture;

[0047] (b) emulsifying the liquid mixture obtained in step (a) and contacting the emulsified product with an oxirane compound.

[0048] In the general formula MgXY, X is a halogen and Y is a halogen or a C1-C6 alkyl group; in the general formula ROH, R is a C1-C8 alkyl group or a C3-C8 cycloalkyl group; and the oxirane compound has a structure represented by formula (II):

[0049]

[0050] wherein the magnesium halide having a general formula of MgXY, the compound having a general formula of ROH, sulfur and the oxirane compound are as described above and will not be repeated here.

[0051] According to the present application, the amount of sulfur is 0.0001 to 0.1 mol, the amount of the compound of the general formula ROH is 4 to 30 mol, and the amount of the oxirane compound of the formula (II) is 1 to 10 mol, based on 1 mol of the magnesium halide of the general formula MgXY; preferably, the amount of the compound of the general formula ROH is 6 to 20 mol, and the amount of the oxirane compound of the formula (II) is 2 to 6 mol, based on 1 mol of the magnesium halide of the general formula MgXY.

[0052] According to the present application, the trace amount of water in each of the above reactants can also participate in the reaction for forming the carrier of the olefin polymerization catalyst.

[0053] According to the present application, a surfactant selected from one or a combination of polyvinylpyrrolidone (PVP), polyethylene glycol (PEG), polyacrylic acid, polyacrylic acid salt, polystyrene sulfonate, naphthalene sulfonate formaldehyde condensate, condensed alkyl phenyl ether sulfate, condensed alkyl phenol polyoxyethylene ether phosphate, oxyalkyl acrylate copolymer modified polyethylene imine, polymer of 1-dodecyl-4-vinylpyridine bromide, polyvinylbenzyltrimethylamine salt, polyvinyl alcohol, polyacrylamide, polyethylene oxide propylene oxide block copolymer, polyvinylpyrrolidone vinyl acetate copolymer, alkyl phenyl polyoxyethylene ether, and polyalkyl methacrylate compound can be added to the liquid mixture in step (a), preferably one or a combination of polyvinylpyrrolidone, polyvinylpyrrolidone vinyl acetate copolymer, and polyethylene glycol.

[0054] According to the present application, the heating conditions for the mixture of sulfur, the magnesium halide of the general formula MgXY, the compound of the general formula ROH, and optionally the inert liquid medium in step (a) are not particularly limited, as long as the heating conditions can melt the magnesium halide of the general formula MgXY and make it react with sulfur sufficiently. Generally, the heating conditions include that the temperature can be 80 to 120°C, and the time can be 0.5 to 5 hours; preferably, the temperature is 80 to 100°C, and the time is 0.5 to 3 hours.

[0055] According to the present application, the amount of the inert liquid medium can be selected according to the amount of the magnesium halide of the general formula MgXY. Generally, the amount of the inert liquid medium can be 0.8-10 L, preferably 2-8 L, based on 1 mol of the magnesium halide of the general formula MgXY. The inert liquid medium can be any liquid medium commonly used in the art which does not chemically interact with the reactants and the reaction products. For example, the inert liquid medium can be silicone oil and / or inert liquid hydrocarbon solvent. Specifically, the inert liquid medium can be one or more of kerosene, paraffin oil, vaseline oil, white oil, methyl silicone oil, ethyl silicone oil, methyl ethyl silicone oil, phenyl silicone oil and methyl phenyl silicone oil. The inert liquid medium of the present application is particularly preferably white oil.

[0056] According to the present application, the liquid mixture obtained in step (a) can be emulsified by using various methods known to those skilled in the art. For example, the liquid mixture can be subjected to low speed shearing or high speed shearing, thereby being emulsified. The stirring speed of the low speed shearing is generally 400-800 rpm. The method of high speed shearing is known to those skilled in the art, such as the high speed stirring method disclosed in CN1151183C (i.e., the solution containing the liquid magnesium halide adduct is stirred at a speed of 2000-5000 rpm). In addition, the liquid mixture can be emulsified by using the methods disclosed in CN1267508C (i.e., the solution containing the liquid magnesium halide adduct is rotationally dispersed in a high gravity bed at a speed of 100-3000 rpm), CN1463990A (i.e., the solution containing the liquid magnesium halide adduct is outputted in an emulsifier at a speed of 1500-8000 rpm) and US6020279 (i.e., the solution containing the liquid magnesium halide adduct is emulsified by a spray method).

[0057] According to the present application, the conditions for contacting the emulsified product with the oxirane compound in step (b) can be any conditions known to form a carrier for olefin polymerization catalyst, for example, the contacting conditions include that the temperature can be 50-120°C and the time can be 20-60 minutes; preferably, the temperature is 60-100°C and the time is 20-50 minutes.

[0058] According to the present application, the method can further comprise a solid-liquid separation of the product obtained from the contacting reaction, washing the solid product and drying. The solid-liquid separation can be any method known in the art that can separate the solid phase from the liquid phase, such as filtration, pressure filtration or centrifugal separation, preferably the method of solid-liquid separation is pressure filtration. The present application does not particularly limit the conditions of pressure filtration, which is subject to the condition that the separation of the solid phase from the liquid phase is as complete as possible. The washing can be performed by any method known to those skilled in the art, such as washing the obtained solid product with inert hydrocarbon solvents (e.g. pentane, hexane, heptane, petroleum ether and gasoline). The present application does not particularly limit the conditions of drying, such as the temperature of drying can be 20-70°C and the time of drying can be 0.5-10 hours. According to the present application, the drying can be performed under normal pressure or reduced pressure.

[0059] Preferably, the magnesium-containing solid component particles obtained in the process of preparing the magnesium-containing solid component are washed with inert hydrocarbon solvents (e.g. hexane, heptane, octane, decane, toluene, etc.) and dried before being used in the subsequent step to prepare the catalyst component for the polymerization of olefins.

[0060] According to the present application, when the internal electron donor contains furan compounds and diether compounds, a certain synergistic effect can be produced. The total content of furan compounds and diether compounds in the internal electron donor is preferably 70-100% by weight, more preferably 80-100% by weight, further preferably 90-100% by weight, and most preferably 100% by weight, based on the amount of the internal electron donor.

[0061] The present application has found that, relative to one mole of diether compounds, when the molar ratio of furan compounds to diether compounds is (0.1-1.5):1, preferably (0.15-1.2):1, and more preferably (0.2-1.0):1, the two can be better synergistically matched, and in combination with the solid component in the present application, a catalyst with higher hydrogen response sensitivity and better overall performance can be obtained.

[0062] In the present application, the furan compounds can be various furan compounds that can be used as internal electron donors for olefin polymerization catalysts, and preferably the furan compounds are selected from at least one of the furan compounds represented by formula (III):

[0063]

[0064] In formula (III), R1and R3are each independently selected from hydrogen, C1-C 20 linear or branched alkyl, C3-C 20 cycloalkyl, C6-C 20aryl or C7~C 20 Aryl groups or C7-C 20 The alkylaryl group; R2 and R4 are each independently selected from C1 to C4. 10 Straight-chain or branched alkyl groups, C3-C 10 cycloalkyl, C6-C 10 aryl or C7~C 10 Aryl groups or C7-C 10 Alkyl aryl.

[0065] Preferably, the furan compound is selected from (3R,3aR,6S,6aR)-3-methoxy-6-propoxyhexahydrofurano[3,2-b]furan, (3R,3aR,6S,6aR)-3-methoxy-6-ethoxyhexahydrofurano[3,2-b]furan, (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan, ( At least one of (3R,3aR,6S,6aR)-3,6-diethoxyhexahydrofuran[3,2-b]furan and (3R,3aR,6S,6aR)-3,6-dipropoxyhexahydrofuran[3,2-b]furan; more preferably, the furan-containing compound is (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuran[3,2-b]furan.

[0066] According to the present invention, the diether compound can be any diether compound capable of serving as an internal electron donor in a catalyst for olefin polymerization, preferably the diether compound is selected from at least one of the diether compounds shown in formula (IV).

[0067] R 1 R 2 C(CH2OR 3 (CH2OR) 4 Formula (Ⅳ)

[0068] Among them, R 1 and R 2 Each is independently selected from hydrogen, C1 to C2. 20 Straight-chain or branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7~C 20 Aryl groups and C7-C 20 One of the alkylaryl groups, wherein the groups may optionally be bonded to form a ring; R 3 and R 4 Each is independently selected from C1 to C2. 10 Alkyl groups.

[0069] Preferably, the diether compound is selected from the group consisting of at least one of 2-(2-ethylhexyl)-l,3-dimethoxypropane, 2-isopropyl-l,3-dimethoxypropane, 2-butyl-l,3-dimethoxypropane, 2-sec-butyl-l,3-dimethoxypropane, 2-cyclohexyl-l,3-dimethoxypropane, 2-phenyl-l,3-dimethoxypropane, 2-(2-phenylethyl)-l,3-dimethoxypropane, 2-(2-cyclohexylethyl)-l,3-dimethoxypropane, 2-(p-chlorophenyl)-l,3-dimethoxypropane, 2-(diphenylmethyl)-l,3-dimethoxypropane, 2,2-dicyclohexyl-l,3-dimethoxypropane, 2,2-dicyclopentyl-l,3-dimethoxypropane, 2,2-diethyl-l,3-dimethoxypropane, 2,2-dipropyl-l,3-dimethoxypropane, 2,2-diisopropyl-l,3-dimethoxypropane, 2,2-dibutyl-l,3-dimethoxypropane, 2-methyl-2-propyl-l,3-dimethoxypropane, 2-methyl-2-benzyl-l,3-dimethoxypropane, 2-methyl-2-ethyl-l,3-dimethoxypropane, 2-methyl-2-isopropyl-l,3-dimethoxypropane, 2-methyl-2-phenyl-l,3-dimethoxypropane, 2-methyl-2-cyclohexyl-l,3-dimethoxypropane, 2,2-bis(2-cyclohexylethyl)-l,3-dimethoxypropane, 2-methyl-2-isobutyl-l,3-dimethoxypropane, 2-methyl-2-(2-ethylhexyl)-l,3-dimethoxypropane, 2,2-diisobutyl-l,3-dimethoxypropane, 2,2-diphenyl-l,3-dimethoxypropane, 2,2-dibenzyl-l,3-dimethoxypropane, 2,2-biscyclohexylmethyl-l,3-dimethoxypropane, 2-isobutyl-2-isopropyl-l,3-dimethoxypropane, 2-(l-methylbutyl)-2-isopropyl-l,3-dimethoxypropane, 2-isopropyl-2-isoamyl-l,3-dimethoxypropane, 2-phenyl-2-isopropyl-l,3-dimethoxypropane, 2-phenyl-2-sec-butyl-l,3-dimethoxypropane, 2-benzyl-2-isopropyl-l,3-dimethoxypropane, 2-cyclopentyl-2-isopropyl-l,3-dimethoxypropane, 2-cyclopentyl-2-sec-butyl-l,3-dimethoxypropane, 2-cyclohexyl-2-isopropyl-l,3-dimethoxypropane, 2-cyclohexyl-2-sec-butyl-l,3-dimethoxypropane, 2-isopropyl-2-sec-butyl-l,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-l,3-dimethoxypropane, and 9,9-dimethoxymethylfluorene.

[0070] Most preferably, the diether compound is 2-isopropyl-2-isoamyl-l,3-dimethoxypropane and / or 9,9-dimethoxymethylfluorene.

[0071] In this invention, the titanium compound can be any of the various titanium compounds conventionally used in the art; for example, the titanium compound can be selected from those with the general formula Ti(OR4). 4-a X a Titanium compounds, wherein R4 can be C1 to C2. 14 The aliphatic hydrocarbon group is preferably a C1-C8 alkyl group, such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, etc.; X can be a halogen, such as F, Cl, Br, I or any combination thereof; a is an integer from 0 to 4. Preferably, the titanium compound is selected from at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tetrabutoxy, titanium tetraethoxy, titanium monochlorotributoxy, titanium dichlorodibutoxy, titanium trichlorobutoxy, titanium monochlorotriethoxy, titanium dichlorodiethoxy, and titanium trichloroethoxy.

[0072] In the catalyst composition of the present invention, the content of magnesium per part by weight of titanium is 2 to 18 parts by weight, preferably 3 to 16 parts by weight; and the content of internal electron donor per part by weight of titanium is 2 to 17 parts by weight, preferably 3 to 15 parts by weight.

[0073] The present invention also provides a method for preparing a catalyst component for olefin polymerization, the method comprising the following steps:

[0074] The process of reacting the prepared magnesium-containing solid component with a titanium compound includes: suspending the magnesium-containing solid component in a titanium compound feedstock at -30°C to 0°C, and then heating to the reaction temperature (approximately 60–130°C) for 0.1–5 hours. In the method for preparing the catalyst component for olefin polymerization, the internal electron donor is added during one or more time periods before, during, and after the reaction between the magnesium source and the titanium source. The time period before the reaction between the magnesium source and the titanium source refers to the time period after the magnesium source is added to the reactor and before the temperature is raised to the reaction temperature. Preferably, the internal electron donors of furan compounds and diether compounds are added during the heating of the mixture of the magnesium-containing solid component and the titanium compound.

[0075] Preferably, after reacting the magnesium-containing solid component with the titanium compound, the method for preparing the catalyst component further includes filtering off the liquid and recovering the solid, then treating the recovered solid once or multiple times with a liquid titanium compound (such as titanium tetrachloride); and then washing the obtained solid catalyst component multiple times with a hydrocarbon solvent. The hydrocarbon solvent can be selected from aliphatic, aromatic, or alicyclic hydrocarbons, such as hexane, heptane, octane, decane, toluene, etc.

[0076] In the preparation process of the catalyst component of the present invention, based on each mole of magnesium, the amount of the titanium compound used can be 5 to 220 moles, preferably 10 to 200 moles; based on each mole of magnesium, the amount of the internal electron donor used can be 0.05 to 1.2 moles, preferably 0.07 to 1.0 mole, and more preferably 0.1 to 0.8 mole.

[0077] The types and amounts of the furan compounds and diether compounds, and the types of the titanium compounds have been described above and will not be elaborated here.

[0078] The present invention also provides a catalyst component for olefin polymerization prepared by the above method.

[0079] The present invention also provides a catalyst for olefin polymerization, which catalyst contains:

[0080] (i) A catalyst component, which is the catalyst component for olefin polymerization provided by the present invention as described above;

[0081] (ii) At least one alkyl aluminum compound; and

[0082] (iii) An optional external electron donor.

[0083] In the catalyst for olefin polymerization, the alkyl aluminum compound can be various alkyl aluminum compounds conventionally used in the art. For example, the general formula of the alkyl aluminum can be AlR n X 3-n , where R is an alkyl group of C1 to C8, the hydrogen on the alkyl group is optionally substituted by a halogen atom, X is a halogen, and n is an integer of 0 < n ≤ 3; specific examples of the alkyl group of C1 to C8 can include but are not limited to: methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl, n-octyl, and the halogen can be fluorine, chlorine, bromine, iodine.

[0084] Specifically, the alkyl aluminum compound can be selected from one or more of triethyl aluminum, triisobutyl aluminum, tri-n-butyl aluminum, tri-n-hexyl aluminum, mono-chloro-diethyl aluminum, mono-chloro-diisobutyl aluminum, mono-chloro-di-n-butyl aluminum, mono-chloro-di-n-hexyl aluminum, di-chloro-ethyl aluminum, di-chloro-isobutyl aluminum, di-chloro-n-butyl aluminum, and di-chloro-n-hexyl aluminum.

[0085] According to the present invention, the amount of the alkyl aluminum compound used can be a conventional amount in the art. Preferably, in the catalyst for olefin polymerization, the molar ratio of the catalyst component for olefin polymerization based on titanium element and the amount of the alkyl aluminum based on aluminum element is 1:(1 to 2000), preferably 1:(20 to 500).

[0086] In the catalyst for olefin polymerization, the external electron donor can be any of the external electron donors commonly used in the art. For example, the external electron donor can be selected from carboxylic acids, carboxylic anhydrides, carboxylic esters, ketones, ethers, alcohols, lactones, organophosphorus compounds, and organosilicon compounds.

[0087] Preferably, the external electron donor contains at least one Si-OR bond and has the general formula (R 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, wherein R 17 R 18 and R 19 Independently C1~C 18 The hydrocarbon group optionally contains heteroatoms, x and y are each independent integers from 0 to 2, z is an integer from 1 to 3, and the sum of x, y, and z is 4. Preferably, R 17 R 18 Independently C3~C 10 Alkyl groups, C3-C 10 cycloalkyl groups, optionally containing heteroatoms; R 19 For C1~C 10 Alkyl groups, optionally containing heteroatoms.

[0088] Specifically, the external electron donor may be selected from, for example, cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl-tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane, and (1,1,1-trifluoro-2-propyl)-methyldimethoxysilane. These external electron donors may be used alone or in combination.

[0089] According to the present invention, the amount of the external electron donor can be a conventional amount in the art. Preferably, in the catalyst for olefin polymerization, the molar ratio of the external electron donor to the amount of alkyl aluminum (calculated as aluminum) can be 1:(1-500), more preferably 1:(2-200).

[0090] According to the present invention, in the preparation of the catalyst for olefin polymerization, alkyl aluminum and optional external electron donor compounds can be reacted separately with the catalyst components for olefin polymerization, or the alkyl aluminum and optional external electron donors can be mixed beforehand and then mixed with the catalyst components for olefin polymerization and reacted.

[0091] According to the present application, when the catalyst for olefin polymerization is used for olefin polymerization, the catalyst component for olefin polymerization, the aluminum alkyl and the optional external electron donor can be added into the polymerization reactor separately, can be mixed and then added into the polymerization reactor, or can be added into the polymerization reactor after pre-polymerization of the olefin by using the pre-polymerization method known in the art.

[0092] The present application also provides the use of the above-mentioned catalyst for olefin polymerization in the polymerization reaction of olefin.

[0093] The present application is improved by using a new catalyst for olefin polymerization, and the specific type of olefin, the polymerization method and conditions of the olefin can be the same as those in the prior art.

[0094] According to the present application, the above-mentioned catalyst is particularly suitable for homopolymerization and copolymerization of olefins with the general formula CH2=CHR (wherein R is hydrogen, C1-C6 alkyl or C6-C10 aryl). 12 According to the present application, the above-mentioned catalyst is particularly suitable for homopolymerization and copolymerization of olefins with the general formula CH2=CHR (wherein R is hydrogen, C1-C6 alkyl or C6-C10 aryl).

[0095] According to the present application, the polymerization of the olefin can be carried out according to the existing method, specifically, under the protection of inert gas, in liquid monomer or inert solvent containing polymerized monomer, or in gas phase, or by combined polymerization process in gas-liquid phase. The temperature of the polymerization reaction can generally be 0-150°C, preferably 60-90°C. The pressure of the polymerization reaction can be normal pressure or higher, for example, it can be 0.01-10 MPa, preferably 0.01-6 MPa, more preferably 0.1-4 MPa. The pressure of the present application refers to the gauge pressure. During the polymerization process, hydrogen can be used as a polymer molecular weight regulator to adjust the molecular weight and melt index of the polymer. In addition, during the polymerization of the olefin, the types and amounts of the inert gas and solvent are known to those skilled in the art, and will not be described here.

[0096] The present application will be further described in detail by the following examples.

[0097] 1. The average particle diameter and particle size distribution of the catalyst component and its carrier were measured by Masters Sizer 2000 particle size instrument (manufactured by Malvern Instruments Ltd);

[0098] 2. The apparent morphology of the magnesium-containing solid component was observed by an optical microscope of model Eclipse E200 commercially available from Nikon Corporation;

[0099] 3. Polymer melt index: measured according to GB 3682-2000 at 230°C under a load of 2.16 kg.

[0100] 4. The fine powder content of the polymer was tested using a MICROTRAC MRB camsizer P4, and the data in the table is the polymer content below 100 mesh (inch), i.e. the polymer content that can pass through a 150 μm sieve mesh aperture, after sieving using a standard sieve.

[0101] Preparation Example 1: Magnesium-containing solid component (catalyst support)

[0102] This preparation example is used to illustrate the olefin polymerization catalyst support and the preparation method thereof provided by the present application.

[0103] In a 0.6 L reaction kettle, 0.08 mol of magnesium chloride, 0.96 mol of ethanol, 1 g of sulfur, and 0.5 g of PVP (polyvinylpyrrolidone) as a surfactant were added, and the temperature was raised to 90°C under stirring. After constant temperature reaction for 2 hours, 0.48 mol of epichlorohydrin was added, and the reaction was carried out for half an hour, after which the product was pressure-filtered, washed with hexane for 5 times, and vacuum-dried to obtain the catalyst support Z1 for olefin polymerization.

[0104] The average particle diameter (D50) of the olefin polymerization catalyst support Z1 was 15 microns, and the particle size distribution ((D90-D10) / D50) was 0.6. As shown in the optical microscope observation of the particle morphology of the olefin polymerization catalyst support Z1, the particles were relatively regular in shape, the surface was smooth, and the particles were basically spherical, the particle size distribution was relatively concentrated, and there were basically no irregular particles. Figure 1

[0105] According to the gas chromatography-mass spectrometry, elemental analysis, and nuclear magnetic resonance characterization, the structural formula of Z1 was:

[0106]

[0107] Preparation Example 2

[0108] This preparation example is used to illustrate the olefin polymerization catalyst support and the preparation method thereof provided by the present application.

[0109] In a 0.6 L reaction kettle, 300 mL of white oil, 0.08 mol of magnesium chloride, 0.48 mol of ethanol, 0.3 g of sulfur chloride, and 1 g of PVP (polyvinylpyrrolidone) as a surfactant were added, and the temperature was raised to 100°C under stirring. After constant temperature reaction for 1 hour, 0.16 mol of epichlorohydrin was added, and the reaction was carried out for 20 minutes, after which the product was pressure-filtered, washed with hexane for 5 times, and finally vacuum-dried to obtain the catalyst support Z2 for olefin polymerization.

[0110] ​The average particle diameter (D50) of the olefin polymerization catalyst support Z2 is 18 micrometers, and the particle size distribution ((D90-D10) / D50) is 0.7. Optical microscopy revealed that the particles of the olefin polymerization catalyst support Z2 have a relatively regular morphology, smooth surface, and are mostly spherical with a relatively concentrated particle size distribution and virtually no irregularly shaped particles.

[0111] Example 1

[0112] This embodiment is used to illustrate the catalyst components for olefin polymerization and their preparation method, as well as the catalysts for olefin polymerization and their applications according to the present invention.

[0113] (1) Preparation of catalyst components

[0114] In a 300 mL glass reaction flask, 80 mL of titanium tetrachloride was added, and the mixture was cooled to -20 °C. Then, 8 g of the above solid component Z1 was added, and the temperature was raised to 115 °C. During the heating process, 2.3 mmol of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan and 8.9 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added. After maintaining the temperature at 110 °C for 1 h, the liquid was filtered off, washed with titanium tetrachloride, then washed with hexane, and dried under vacuum to obtain the solid catalyst component Cat-1.

[0115] (2) Propylene liquid-phase bulk polymerization

[0116] Propylene liquid-phase bulk polymerization was carried out in a 5L stainless steel high-pressure reactor. Under nitrogen protection, 5 ml of triethylaluminum in hexane (concentration 0.5 mmol / ml), 1 ml of cyclohexylmethyldimethoxysilane (CHMMS) in hexane (concentration 0.1 mmol / ml), and 7.5 mg of the above-mentioned solid catalyst Cat-1 were added sequentially. The high-pressure reactor was closed, and hydrogen and 2.3 L of liquid propylene were added. The temperature was raised to 70°C, and after reacting for 1 hour, the temperature was lowered, the pressure was released, and the product was discharged. The resulting propylene homopolymer was dried, weighed, and analyzed. The results are shown in Table 1.

[0117] Example 2

[0118] This embodiment is used to illustrate the catalyst components for olefin polymerization and their preparation method, as well as the catalysts for olefin polymerization and their applications according to the present invention.

[0119] The catalyst component was prepared and propylene liquid bulk polymerization was carried out according to the method of Example 1, except that the solid component added was Z2, 3.2 mmol of (3R, 3aR, 6S, 6aR)-3, 6-dimethoxyhexahydrofuro[3, 2-b]furan and 7.0 mmol of 9, 9-dimethoxymethylfluorene were added during the temperature rising process, to obtain a solid catalyst component Cat-2, the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0120] Example 3

[0121] This example is used to illustrate the catalyst component for olefin polymerization, the preparation method thereof and the catalyst for olefin polymerization and application thereof of the present application.

[0122] The catalyst component was prepared and propylene liquid bulk polymerization was carried out according to the method of Example 1, except that the solid component added was Z2, 4.7 mmol of (3R, 3aR, 6S, 6aR)-3, 6-dimethoxyhexahydrofuro[3, 2-b]furan and 6.5 mmol of 2-isopropyl-2-isopentyl-1, 3-dimethoxypropane were added during the temperature rising process, to obtain a solid catalyst component Cat-3, the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0123] Example 4

[0124] This example is used to illustrate the catalyst component for olefin polymerization, the preparation method thereof and the catalyst for olefin polymerization and application thereof of the present application.

[0125] The catalyst component was prepared and propylene liquid bulk polymerization was carried out according to the method of Example 1, except that 5.8 mmol of (3R, 3aR, 6S, 6aR)-3, 6-dimethoxyhexahydrofuro[3, 2-b]furan and 6.3 mmol of 2-isopropyl-2-isopentyl-1, 3-dimethoxypropane were added during the temperature rising process, to obtain a catalyst component for olefin polymerization Cat-4; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0126] Comparative Example 1

[0127] This comparative example is used to illustrate the reference catalyst component for olefin polymerization, the preparation method thereof and the catalyst for olefin polymerization and application thereof.

[0128] The catalyst component was prepared according to the method of Example 1 and propylene liquid bulk polymerization was carried out, except that in the preparation of the catalyst component, 8 g of halogenated magnesium carrier (prepared according to the method disclosed in Example 1 of CN1267508C) was added instead of solid component Z1, and the (3R, 3aR, 6S, 6aR)-3, 6-dimethoxyhexahydrofuro[3, 2-b] furan was replaced with the same molar amount of 2-isopropyl-2-isopentyl-1, 3-dimethoxypropane to obtain a catalyst component for olefin polymerization DCat-1; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0129] Comparative Example 2

[0130] The present comparative example is used to illustrate the reference catalyst component for olefin polymerization, its preparation method and the catalyst for olefin polymerization and its application.

[0131] The catalyst component was prepared according to the method of Example 1 and propylene liquid bulk polymerization was carried out, except that in the preparation of the catalyst component, 8 g of halogenated magnesium carrier (prepared according to the method disclosed in Example 1 of CN1267508C) was added instead of solid component Z1, and the (3R, 3aR, 6S, 6aR)-3, 6-dimethoxyhexahydrofuro[3, 2-b] furan was replaced with the same molar amount of 2-isopropyl-2-isopentyl-1, 3-dimethoxypropane to obtain a catalyst component for olefin polymerization DCat-1; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0132] Comparative Example 3

[0133] The present comparative example is used to illustrate the reference catalyst component for olefin polymerization, its preparation method and the catalyst for olefin polymerization and its application.

[0134] The catalyst component was prepared according to the method of Example 1 and propylene liquid bulk polymerization was carried out, except that in the preparation of the catalyst component, 8 g of halogenated magnesium carrier (prepared according to the method disclosed in Example 1 of CN1267508C) was added instead of solid component Z1, and the (3R, 3aR, 6S, 6aR)-3, 6-dimethoxyhexahydrofuro[3, 2-b] furan was replaced with the same molar amount of 2-isopropyl-2-isopentyl-1, 3-dimethoxypropane to obtain a catalyst component for olefin polymerization DCat-1; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0135] Table 1

[0136]

[0137]

[0138] As can be seen from the results of the examples and comparative examples in Table 1, the catalyst component of the present application has a narrow particle size distribution, and the catalyst has high hydrogen response sensitivity and good polymerization activity, and when used for the polymerization of olefins, the polymer produced has a low fine powder content, and the catalyst component of the present application does not contain phthalate compounds (plasticizers).

[0139] Any numerical values recited herein include all values from the lower value and the upper value. For example, if a concentration range is stated as 1% to 50%, it is intended that values such as 15% to 25%, 22%, or 45.5%, are encompassed within the range. Likewise, the description of a process, method, article or material as comprising, consisting of, consisting essentially of or consisting essentially of, particular components or steps means that the process, method, article or material can also comprise other components or steps, and that these can vary from those specifically recited. Thus, for example, a composition can contain not only the compounds specifically recited, but also other compounds, and a process can involve not only the specific steps recited, but also other steps, provided that these do not interfere with the specific process steps recited.

[0140] It is to be understood that the embodiments described above are merely illustrative of the present application and do not limit the scope of the application. The present application has been described in terms of particular embodiments, but numerous modifications and alterations can be made thereto without departing from the spirit and scope of the application. It is intended that the application not be limited by any of the particular embodiments described herein, but that the application should be construed in accordance with the limitations and alternatives recited in the appended claims. Although the present application has been described in detail with reference to particular embodiments, it should be understood that various other adaptations and modifications can be made within the scope of the present application and without departing from the true spirit and scope of the application. Therefore, it is not intended that the present application be limited to the specific embodiments discussed in this specification.

Claims

1. A catalyst component for olefin polymerization, characterized in that, This catalyst component contains the following reaction products: (1) Magnesium-containing solid components; (2) at least one titanium-containing compound; and (3) Internal electron donor; The internal electron donor contains furan compounds and diether compounds; The magnesium-containing solid component is a magnesium-containing compound represented by formula (Ⅰ): Equation (I) In formula (I), R1 is a C1-C6 straight-chain or branched alkyl group; R2 and R3 may be the same or different, and are independently hydrogen or C1-C5 straight-chain or branched alkyl groups, wherein the hydrogen on the alkyl group may optionally be replaced by a halogen atom; X is chlorine or bromine; m is 0.1-1.9, n is 0.1-1.9, m+n=2, 0 <q≤0.5; The furan compound is selected from at least one of the furan compounds shown in formula (III): Formula (III) In equation (Ⅲ), R1 and R3 are each independently selected from hydrogen, C1~C 20 Straight-chain or branched alkyl groups, C3-C20 cycloalkyl groups, C6-C20 aryl groups, C7-C20 aralkyl groups, or C7-C 20 The alkylaryl group; R2 and R4 are each independently selected from C1 to C4. 10 Straight-chain or branched alkyl groups, C3-C10 cycloalkyl groups, C6-C10 aryl groups, C7-C10 aralkyl groups, or C7-C 10 Alkyl; The molar ratio of furan compounds to diether compounds is (0.1~1.5):

1.

2. The catalyst component according to claim 1, characterized in that, The preparation steps of the magnesium-containing solid component include: (a) Sulfur, magnesium halide of general formula MgXY, compound of general formula ROH, and optional inert liquid medium are mixed and heated to obtain a liquid mixture; (b) Emulsify the liquid mixture obtained in step (a) and react the emulsion with an ethylene oxide compound; And / or, in the general formula MgXY, X is a halogen, Y is a halogen, a C1-C6 alkyl group, a C1-C5 alkoxy group, or a C6-C6 alkyl group. 10 aryl or C6~C 10 The aryl group; and / or, in the general formula ROH, R is a C1-C8 alkyl or a C3-C8 cycloalkyl; and / or, the structure of the ethylene oxide compound is as shown in formula (II): Equation (II) R5 and R6 are each independently hydrogen, C1-C5 alkyl, or C1-C5 haloalkyl; And / or, in step (a), the heating conditions include: a temperature of 80~120°C and a time of 0.5~5 hours; And / or, in step (b), the conditions for the contact reaction include: a temperature of 50~120°C and a time of 20~60 minutes.

3. The catalyst component according to claim 2, characterized in that, In step (a), the heating conditions include: the temperature is 80~100℃ and the time is 0.5~3 hours; And / or, in step (b), the conditions for the contact reaction include: a temperature of 60~100°C and a time of 20~50 minutes.

4. The catalyst component according to claim 2 or 3, characterized in that, Based on 1 mol of magnesium halide with the general formula MgXY, the amount of sulfur used is 0.0001~0.1 mol, the amount of compound with the general formula ROH is 4~30 mol, the amount of ethylene oxide compound is 1~10 mol, and the amount of inert liquid medium is 0.8~10 L. And / or, the sulfur is anhydrous sulfur or sulfur containing water of crystallization; And / or, in the general formula MgXY, X is chlorine or bromine, and Y is chlorine, bromine, C1-C5 alkyl, C1-C5 alkoxy, C6-C5 alkyl, C6-C5 alkoxy ... 10 aryl or C6~C 10 aryloxy groups; And / or, in the general formula ROH, R is a C1 to C8 alkyl group; And / or, the ethylene oxide compounds are one or more of ethylene oxide, propylene oxide, epibutylene oxide, epichlorohydrin, epichlorohydrin, epibromopropane, and epibromobutane; And / or, the inert liquid medium is silicone oil and / or an inert liquid hydrocarbon solvent; And / or, the average particle diameter of the magnesium-containing solid component is 12-30 micrometers, and the particle size distribution is less than 1.

2.

5. The catalyst component according to claim 4, characterized in that, Based on 1 mol of magnesium halide with the general formula MgXY, the amount of compound with the general formula ROH is 6~20 mol, the amount of ethylene oxide compound is 2~6 mol, and the amount of inert liquid medium is 2~8 L. And / or, the sulfur is sulfur, sulfur bromide or sulfur iodide; And / or, in the general formula MgXY, the C1-C5 alkyl groups are methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, or neopentyl, the C1-C5 alkoxy groups are methoxy, ethoxy, propoxy, isopropoxy, butoxy, or isobutoxy, and the C6-C5 alkyl groups are... 10 The aryl group is phenyl, o-tolyl, m-tolyl, p-tolyl, o-ethylphenyl, m-ethylphenyl, p-ethylphenyl, or naphthyl, wherein C6~C 10 The aryl group is phenoxy or naphthoxy; and / or, the magnesium halide of the general formula MgXY is one or more of magnesium chloride, magnesium bromide, magnesium phenoxy chloride, magnesium isopropoxy chloride, and magnesium n-butoxy chloride. And / or, in the general formula ROH, R is a C1-C8 alkyl group, and the C1-C8 alkyl group is 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; And / or, the inert liquid medium is one or more 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, the particle size distribution of the magnesium-containing solid component is 0.2~0.

8.

6. The catalyst component according to claim 5, characterized in that, The sulfur mentioned is sulfur; And / or, magnesium halides of the general formula MgXY are one or more of magnesium chloride, magnesium bromide, magnesium phenoxy chloride, magnesium isopropoxy chloride, and magnesium n-butoxy chloride; And / or, compounds with the general formula ROH are one or more of ethanol, propanol, isopropanol, n-butanol, isobutanol, pentanol, isoamyl alcohol, n-hexanol, n-octanol, and 2-ethylhexanol; And / or, the inert liquid medium is white oil.

7. The catalyst component according to claim 2 or 3, characterized in that, Based on the amount of the internal electron donor, the total content of furan compounds and diether compounds in the internal electron donor is 70% to 100% by weight. And / or, the molar ratio of the furan compound to the diether compound is (0.15~1.2):1; And / or, the diether compound is selected from at least one of the diether compounds shown in formula (Ⅳ), R 1 R 2 C(CH2OR) 3 (CH2OR) 4 Formula (Ⅳ) Among them, R 1 and R 2 Each is independently selected from hydrogen, C1~C 20 Straight-chain or branched alkyl groups, C3~C 20 cycloalkyl, C6~C 20 aryl, C7~C 20 Aryl groups and C7~C 20 One of the alkylaryl groups, wherein the groups may optionally be bonded to form a ring; R 3 and R 4 Each is independently selected from C1 to C2. 10 Alkyl groups; And / or, the titanium compound is selected from the general formula Ti(OR4). 4-a X a Titanium compounds, wherein R4 is C1~C 14 aliphatic hydrocarbon group; X is a halogen; a is an integer from 0 to 4; And / or, in the catalyst component, the content of magnesium is 2 to 18 parts by weight per part by weight of titanium, and the content of internal electron donor is 2 to 17 parts by weight.

8. The catalyst component according to claim 7, characterized in that, Based on the amount of the internal electron donor, the total content of furan compounds and diether compounds in the internal electron donor is 80% to 100% by weight. And / or, the molar ratio of the furan compound to the diether compound is (0.2~1.0):1; And / or, the furan compound is selected from at least one of (3R,3aR,6S,6aR)-3-methoxy-6-propoxyhexahydrofuran[3,2-b]furan, (3R,3aR,6S,6aR)-3-methoxy-6-ethoxyhexahydrofuran[3,2-b]furan, (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuran[3,2-b]furan, (3R,3aR,6S,6aR)-3,6-diethoxyhexahydrofuran[3,2-b]furan, and (3R,3aR,6S,6aR)-3,6-dipropoxyhexahydrofuran[3,2-b]furan; And / or, the diether compound is selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2-phenylethyl)-1,3-dimethoxypropane, 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(p-chlorophenyl)-1,3-dimethoxypropane, 2-(diphenylmethyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, 2,2-Dicyclopentyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2,2 -Bis(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-methyl-2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-bis(cyclohexylmethyl)-1,3-dimethoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2-(1-methylbutyl)-2-isopropyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, At least one of 2-phenyl-2-isopropyl-1,3-dimethoxypropane, 2-phenyl-2-sec-butyl-1,3-dimethoxypropane, 2-benzyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclohexyl-2-sec-butyl-1,3-dimethoxypropane, 2-isopropyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane, and 9,9-dimethoxymethylfluorene; And / or, the titanium compound is selected from the general formula Ti(OR4). 4-a X a Titanium compounds, wherein R4 is a C1-C8 alkyl group; X is at least one of F, Cl, Br or I; And / or, in the catalyst component, the content of magnesium is 3 to 16 parts by weight per part by weight of titanium, and the content of internal electron donor is 3 to 15 parts by weight.

9. The catalyst component according to claim 8, characterized in that, Based on the amount of the internal electron donor, the total content of furan compounds and diether compounds in the internal electron donor is 90% to 100% by weight. And / or, the furan-containing compound is (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan; And / or, the diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane and / or 9,9-dimethoxymethylfluorene; And / or, the titanium compound is selected from the general formula Ti(OR4). 4-a X a Titanium compounds, wherein R4 is methyl, ethyl, propyl, butyl, pentyl, hexyl or heptyl.

10. The catalyst component according to claim 9, characterized in that, Based on the amount of the internal electron donor, the total content of furan compounds and diether compounds in the internal electron donor is 100% by weight. And / or, the titanium compound is selected from at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tetrabutoxy, titanium tetraethoxy, titanium monochlorotributoxy, titanium dichlorodibutoxy, titanium trichlorobutoxy, titanium monochlorotriethoxy, titanium dichlorodiethoxy, and titanium trichloroethoxy.

11. A method for preparing a catalyst component for olefin polymerization according to any one of claims 1 to 10, the method comprising: The magnesium-containing solid component is reacted with a titanium compound, and an internal electron donor containing furan compounds and diether compounds is added.

12. The preparation method according to claim 11, characterized in that, The contact reaction includes: suspending the magnesium-containing solid component in a titanium-containing compound raw material at -30°C to 0°C, and heating to 60~130°C for 0.1~5 hours; And / or, the preparation method further includes: filtering off the liquid after the reaction and recovering the solid, treating the solid with a liquid titanium compound once or multiple times, and then washing it multiple times with a hydrocarbon solvent to obtain the catalyst component; And / or, in the preparation method, the amount of the titanium compound used per mole of magnesium can be 5 to 220 moles; the amount of the internal electron donor used per mole of magnesium can be 0.05 to 1.2 moles.

13. The preparation method according to claim 12, characterized in that, The hydrocarbon solvent is selected from aliphatic hydrocarbons, aromatic hydrocarbons, or alicyclic hydrocarbons; And / or, in the preparation method, the amount of the titanium compound used per mole of magnesium can be 10 to 200 moles; and / or, the amount of the internal electron donor used per mole of magnesium can be 0.07 to 1.0 moles.

14. The preparation method according to claim 13, characterized in that, The amount of the internal electron donor is 0.1 to 0.8 moles per mole of magnesium.

15. A catalyst for olefin polymerization, characterized in that, The catalyst contains: (i) a catalyst component selected from at least one of the catalyst components according to any one of claims 1 to 10 and the catalyst components prepared by the preparation method according to any one of claims 11 to 14; (ii) at least one alkylaluminum compound; as well as (iii) An optional external electron donor.

16. The catalyst according to claim 15, characterized in that, The general formula of the alkylaluminum is AlR n X 3-n , where R is an alkyl group having 1 to 8 carbon atoms, the hydrogen on the alkyl group is optionally substituted by a halogen atom, X is a halogen, and n is an integer of 0 < n ≤ 3; And / or, the external electron donor is selected from carboxylic acids, carboxylic anhydrides, carboxylic esters, ketones, ethers, alcohols, lactones, organophosphorus compounds, and organosilicon compounds; And / or, the molar ratio of the catalyst component based on titanium to the alkylaluminum compound based on aluminum is 1:(1~2000). And / or, the molar ratio of the external electron donor to the alkylaluminum compound based on aluminum is 1:(1~500).

17. The catalyst according to claim 16, characterized in that, In the general formula of the alkylaluminum, the C1-C8 alkyl group is methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl or n-octyl, and the halogen is fluorine, chlorine, bromine or iodine; And / or, the external electron donor is a component containing at least one Si-OR bond and having the general formula (R 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, wherein R 17 R 18 and R 19 Independently C1~C 18 The hydrocarbon group, optionally containing heteroatoms, x and y are each independent integers from 0 to 2, z is an integer from 1 to 3, and the sum of x, y and z is 4; And / or, the molar ratio of the catalyst component based on titanium to the alkylaluminum compound based on aluminum is 1:(20~500). And / or, the molar ratio of the external electron donor to the alkylaluminum compound based on aluminum is 1:(2~200).

18. The catalyst according to claim 17, characterized in that, The alkylaluminum compound is selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, di-n-hexylaluminum chloride, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, and di-n-hexylaluminum chloride. And / or, R 17 R 18 Independently C3~C 10 Alkyl groups, C3~C 10 cycloalkyl groups, optionally containing heteroatoms, R 19 C1~C 10 Alkyl groups, optionally containing heteroatoms.

19. The catalyst according to claim 18, characterized in that, The external electron donor is selected from cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane, and (1,1,1-trifluoro-2-propyl)-methyldimethoxysilane.

20. An olefin polymerization reaction, characterized in that, The olefin is polymerized in the presence of at least one of the catalyst components according to any one of claims 1 to 10, the catalyst components prepared by the preparation method according to any one of claims 11 to 14, and the catalysts according to any one of claims 15 to 19; The olefin has the general formula CH2=CHR, where R is hydrogen, a C1-C6 alkyl group, or a C6-C6 alkyl group. 12 Aryl groups.

21. The olefin polymerization reaction according to claim 20, characterized in that, The polymerization reaction temperature is 0~150℃; the polymerization reaction pressure is 0.01~10MPa.

22. The olefin polymerization reaction according to claim 21, characterized in that, The polymerization reaction is carried out at a temperature of 60-90°C; and / or at a pressure of 0.01-6 MPa.

23. The olefin polymerization reaction according to claim 22, characterized in that, The polymerization reaction is carried out at a pressure of 0.1~4 MPa.

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