Catalyst component for olefin polymerization, catalyst and application

Abstract

The invention belongs to the technical field of olefin polymerization catalysts, and discloses a catalyst component for olefin polymerization, a catalyst and an application thereof, wherein the catalyst component comprises a reaction product of the following components: a magnesium source, a titanium source and an internal electron donor; the internal electron donor comprises a monoether compound, a diether compound and a glycol ester compound, and the molar ratio of the monoether compound, the diether compound and the glycol ester compound is 0.2-3:0.1-8:1. The catalyst also has high stereospecificity and hydrogen modulation sensitivity.

Description

Technical Field

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

[0002] The melt flow rate and isotactic index of polymers are two important performance indicators of polymers, and are also important references for selecting plastic processing materials and grades. The melt flow rate depends largely on the molecular weight of the polymer. Low molecular weight polymers have high melt flow rates. In order to obtain olefin polymers with high melt flow rates, it is generally necessary to add a large amount of hydrogen during polymerization to make the polymer low molecular weight. 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 polymerized olefin gas has to be reduced, in which case the productivity will decrease. The stereospecificity of the catalyst determines the isotactic index of the polymer. The higher the isotactic index of polypropylene, the higher its regularity and crystallinity. The mechanical properties of the product, such as hardness, stiffness, modulus, fracture and yield strength, are increased, and the melting point, thermal stability, aging resistance and radiation resistance are also improved accordingly. Therefore, in order to improve the stereospecificity of the catalyst, researchers have been conducting a lot of research work.

[0003] At present, many catalysts with high stereospecificity have low hydrogen adjustment sensitivity, while catalysts with high hydrogen adjustment sensitivity have low stereospecificity. Therefore, it is urgent to develop a catalyst with excellent comprehensive performance, that is, a catalyst with high hydrogen adjustment sensitivity while maintaining high stereospecificity, so that olefin polymers can have both high melt flow rate and high isotactic index. Summary of the invention

[0004] The inventors unexpectedly discovered during their research that the use of an internal electron donor containing a monoether compound, a diether compound and a glycol ester compound can enable the catalyst to have both high stereospecificity and hydrogen modulation sensitivity. Based on this discovery, the present invention is proposed.

[0005] A first aspect of the present invention provides a catalyst component for olefin polymerization, the catalyst component comprising a reaction product of: a magnesium source, a titanium source and an internal electron donor;

[0006] The internal electron donor contains monoether compounds, diether compounds and glycol ester compounds, and the molar ratio of the monoether compounds, diether compounds and glycol ester compounds is 0.2-3:0.1-8:1.

[0007] A second aspect of the present invention provides a catalyst for olefin polymerization, the catalyst comprising the reaction product of the following components:

[0008] (i) the above-mentioned catalyst components;

[0009] (ii) at least one alkylaluminum compound; and

[0010] (iii) Optional external electron donor.

[0011] The third aspect of the present invention provides use of the above catalyst in olefin polymerization.

[0012] The present invention adopts an internal electron donor containing monoether compounds, diether compounds and glycol ester compounds, which can make the catalyst have high stereospecificity and hydrogen adjustment sensitivity at the same time and does not contain phthalate compounds (plasticizers).

[0013] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0014] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0015] According to a first aspect of the present invention, a catalyst component for olefin polymerization is provided, which comprises a reaction product of a magnesium source, a titanium source and an internal electron donor, wherein the internal electron donor comprises a monoether compound, a diether compound and a glycol ester compound.

[0016] According to the present invention, the monoether compounds, diether compounds and glycol ester compounds in the internal electron donor can produce a synergistic effect, and the molar ratio of the monoether compounds, diether compounds and glycol ester compounds can be 0.2-3:0.1-8:1, preferably 0.5-2.5:0.5-6:1. The three can be synergistically formulated better using the above preferred dosages, and the obtained catalyst has high stereospecificity and hydrogen adjustment sensitivity.

[0017] In the present invention, the amounts of magnesium source, titanium source and internal electron donor can adopt the conventional amounts in the prior art. Specifically, the molar ratio of the magnesium source calculated as magnesium element, the titanium source calculated as titanium element and the internal electron donor can be 1:15-180:0.1-0.9, preferably 1:18-130:0.15-0.6.

[0018] According to the present invention, based on the total weight of the internal electron donor, the total amount of the monoether compound, the diether compound and the glycol ester compound can be 70-100 weight %, preferably 80-100 weight %, more preferably 90-100 weight %, and most preferably 100 weight %.

[0019] In the present invention, the monoether compound may be any monoether compound that can be used as an electron donor in a catalyst for olefin polymerization. Preferably, the monoether compound is selected from at least one of the monoether compounds represented by formula (1):

[0020] R7OR8 formula (1)

[0021] In formula (1), R7 and R8 are each independently selected from C1 to C 10 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Arylalkyl or C7-C 20 The hydrogen atoms on the alkaryl, alkyl, aryl, alkaryl and aralkyl groups are optionally substituted by halogen atoms.

[0022] Preferably, the monoether compound is selected from at least one of ethyl ether, tetrahydrofuran, ethylene oxide, methyl butyl ether, butyl ether, ethyl butyl ether, dimethyl ether, chloroethyl n-propyl ether, dipropyl ether, methyl ethyl ether, anisole and amyl ether; more preferably, the monoether compound is butyl ether.

[0023] According to the present invention, the diether compound may be any diether compound that can be used as an electron donor in a catalyst for olefin polymerization. Preferably, the diether compound is selected from at least one of the diether compounds represented by formula (2):

[0024]

[0025] In formula (2), R I , R II , R III , R IV , RV and R VI the same or different, each independently selected from hydrogen, halogen atoms, C1-C 20 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl or C7-C 20 The aralkyl group, R I -R VI The groups of R may be optionally bonded to form a ring; VII and R VIII The same or different, each independently selected from C1-C 20 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Alkyl or C7-C 20 of aralkyl.

[0026] Preferably, 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.

[0027] More preferably, the diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane or 9,9-dimethoxymethylfluorene.

[0028] According to the present invention, the diol ester compound may be any diol ester compound that can be used as an electron donor in a catalyst for olefin polymerization. Preferably, the diol ester compound is selected from at least one of the diol ester compounds represented by formula (3):

[0029]

[0030] In formula (3), R1 and R2 are the same or different and are independently C1-C 10 Straight or branched alkyl, C3-C 20 Substituted or unsubstituted cycloalkyl, C6-C 20 Substituted or unsubstituted aryl, C7-C 20 Substituted or unsubstituted aralkyl or C7-C 20 The aromatic ring in the aryl, aralkyl or alkaryl group is optionally substituted by one or more selected from halogen, C1-C6 straight or branched alkyl and C1-C6 alkoxy; the brackets "[]" indicate that there are n carbon atoms bonded in sequence, and each carbon atom is also bonded to two substituents, that is, there are n carbon atoms and R in the brackets. 1 , R 2 , R 3 ...R 2n There are 2n substituents in total;

[0031] R3, R4, R5, R6 and R 1 -R 2n are the same or different and are independently hydrogen, halogen, C1-C 20 Straight or branched alkyl, C3-C 20 Substituted or unsubstituted cycloalkyl, C6-C 20 Substituted or unsubstituted aryl, C7-C 20 Substituted or unsubstituted alkylaryl, C7-C 20 Substituted or unsubstituted aralkyl, C2-C 10 A straight chain or branched olefin group or C 10 -C 20 R3, R4, R5, R6 and R 1 -R 2n Optionally contain heteroatoms, the heteroatoms are one or more of nitrogen, oxygen, sulfur, silicon, halogen and phosphorus; or, R3, R4, R5, R6 and R 1 -R 2n Two or more of them are bonded to each other to form a saturated or unsaturated ring;

[0032] n is an integer of 0-10. When n=0, in the diol ester compound represented by formula (3), the carbon atoms of the substituents R3 and R4 are directly bonded to the carbon atoms of the substituents R5 and R6.

[0033] In the present invention, C1-C 20 Examples of straight or branched alkyl groups may include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, 1-ethylpropyl, 2-methylbutyl, 3-methylbutyl, 2,2-dimethylpropyl, n-hexyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, n-heptyl, 2-methylhexyl, 3-methylhexyl, 4-methylhexyl, 5-methylhexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, tetrahydrogeranyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl, n-octadecyl, n-nonadecyl, and n-eicosyl.

[0034] C3-C 20 Examples of the substituted or unsubstituted cycloalkyl group may include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, 4-n-butylcyclohexyl, cycloundecyl, and cyclododecyl.

[0035] C6-C 20 Examples of the substituted or unsubstituted aryl group may include, but are not limited to, phenyl, methylphenyl, ethylphenyl, 4-tert-butylphenyl, and the like.

[0036] C7-C 20 The substituted or unsubstituted aralkyl group refers to an alkyl group having 7 to 20 carbon atoms and having an aryl substituent. 20 Examples of the substituted or unsubstituted aralkyl group may include, but are not limited to, 3-phenylpropyl, benzyl, and the like.

[0037] C7-C 20 The substituted or unsubstituted alkaryl group refers to an aryl group having 7 to 20 carbon atoms and having an alkyl substituent. 20 Examples of the substituted or unsubstituted alkylaryl group may include, but are not limited to, methylphenyl, ethylphenyl, and the like.

[0038] Examples of C1-C6 alkoxy groups may include, but are not limited to, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, sec-butoxy, isobutoxy, tert-butoxy, n-pentoxy, isopentoxy, tert-pentoxy, and hexoxy.

[0039] C2-C 10Examples of the straight or branched olefin group may include, but are not limited to, ethenyl, propenyl, butenyl, pentenyl, octenyl, and the like.

[0040] C 10 -C 20 Examples of the fused ring aromatic group may include, but are not limited to, naphthyl, anthracenyl, phenanthrenyl, pyrenyl, and the like.

[0041] Preferably, the diol ester compound is selected from 1,3-propylene glycol dibenzoate, 2-methyl-1,3-propylene glycol dibenzoate, 2-ethyl-1,3-propylene glycol dibenzoate, 2-propyl-1,3-propylene glycol dibenzoate, 2-butyl-1,3-propylene glycol dibenzoate, 2,2-dimethyl-1,3-propylene glycol dibenzoate, 2-ethyl-2-butyl-1,3-propylene glycol dibenzoate, 2,2-diethyl-1,3-propylene glycol dibenzoate, 2-methyl-2-propyl-1,3-propylene glycol dibenzoate, 2-isopropyl-2-isopentyl-1,3-propylene glycol dibenzoate, 2,4-pentanediol dibenzoate, 3-methyl-2,4-pentanediol dibenzoate, 3-ethyl -2,4-pentanediol dibenzoate, 3-propyl-2,4-pentanediol dibenzoate, 3-butyl-2,4-pentanediol dibenzoate, 3,3-dimethyl-2,4-pentanediol dibenzoate, 2-methyl-1,3-pentanediol dibenzoate, 2,2-dimethyl-1,3-pentanediol dibenzoate, 2-ethyl-1,3-pentanediol dibenzoate, 2-butyl-1,3-pentanediol dibenzoate, 2-methyl-1,3-pentanediol dibenzoate, 2-ethyl-1,3-pentanediol dibenzoate, 2-propyl-1,3-pentanediol dibenzoate, 2-butyl-1,3-pentanediol dibenzoate, 2,2-dimethyl-1,3-pentanediol dibenzoate, 2-methyl-1,3-pentanediol dibenzoate diol dibenzoate, 2,2-dimethyl-1,3-pentanediol dibenzoate, 2-ethyl-1,3-pentanediol dibenzoate, 2-butyl-1,3-pentanediol dibenzoate, 2,2,4-trimethyl-1,3-pentanediol dibenzoate, 3-methyl-3-butyl-2,4-pentanediol dibenzoate, 2,2-dimethyl-1,5-pentanediol dibenzoate, 1,6-hexanediol dibenzoate, 6-heptene-2,4-heptanediol dibenzoate, 2-methyl-6-heptene-2,4-heptanediol dibenzoate, 3-methyl-6-heptene-2,4-heptanediol dibenzoate, 4-methyl-6-heptene-2,4-heptanediol dibenzoate, 5-methyl-6-heptene-2,4-heptanediol dibenzoate 6-Methyl-6-heptene-2,4-heptanediol dibenzoate, 3-ethyl-6-heptene-2,4-heptanediol dibenzoate, 4-ethyl-6-heptene-2,4-heptanediol dibenzoate, 5-ethyl-6-heptene-2,4-heptanediol dibenzoate, 6-ethyl-6-heptene-2,4-heptanediol dibenzoate, 3-propyl-6-heptene-2,4-heptanediol dibenzoate, 4-propyl-6-heptene-2,4-heptanediol dibenzoate, 5-propyl-6-heptene-2,4-heptanediol dibenzoate, 6-propyl-6-heptene-2,4-heptanediol dibenzoate, 3-butyl-6-heptene-2,4-heptanediol dibenzoate, 4-butyl-6-heptene-2,4-heptanediol dibenzoate, 5-butyl-6-heptene-2,4-heptanediol dibenzoate, 6-butyl-6-heptene-2,4-heptanediol dibenzoate, 3,5-dimethyl-6-heptene-2,4-heptanediol dibenzoate, 3,5-diethyl-6-heptene-2,4-heptanediol dibenzoate, 3,5-dipropyl-6-heptene-2,4-heptanediol dibenzoate, 3,5-dibutyl-6-heptene-2,4-heptanediol dibenzoate, 3,3-dimethyl-6-heptene-2,4-heptanediol dibenzoate, 3,3-diethyl-6-heptene-2,4-heptanediol dibenzoate, 3,3-dipropyl-6-heptene-2,4-heptanediol dibenzoate, 3,3-dibutyl 6-Heptene-2,4-heptanediol dibenzoate, 3,5-heptanediol dibenzoate, 2-methyl-3,5-heptanediol dibenzoate, 3-methyl-3,5-heptanediol dibenzoate, 4-methyl-3,5-heptanediol dibenzoate, 5-methyl-3,5-heptanediol dibenzoate, 6-methyl-3,5-heptanediol dibenzoate, 3-ethyl-3,5-heptanediol dibenzoate, 4-ethyl-3,5-heptanediol dibenzoate, 5-ethyl-3,5-heptanediol dibenzoate, 3-propyl-3,5-heptanediol dibenzoate, 4-propyl-3,5-heptanediol dibenzoate, 3-butyl-3,5-heptanediol dibenzoate, 2,3-dimethyl-3,5-heptanediol dibenzoate dibenzoate, 2,4-dimethyl-3,5-heptanediol dibenzoate, 2,5-dimethyl-3,5-heptanediol dibenzoate, 2,6-dimethyl-3,5-heptanediol dibenzoate, 3,3-dimethyl-3,5-heptanediol dibenzoate, 4,4-dimethyl-3,5-heptanediol dibenzoate, 6,6-dimethyl-3,5-heptanediol dibenzoate, 2,6-dimethyl-3,5-heptanediol dibenzoate, 3,4-dimethyl-3,5-heptanediol dibenzoate, 3,5-dimethyl-3,5-heptanediol dibenzoate, 3,6-dimethyl-3,5-heptanediol dibenzoate, 4,5-dimethyl-3,5-heptanediol dibenzoate, 4,6-dimethyl-3,5-heptanediol dibenzoate. Heptanediol dibenzoate, 4,4-dimethyl-3,5-heptanediol dibenzoate, 6,6-dimethyl-3,5-heptanediol dibenzoate, 2-methyl-3-ethyl-3,5-heptanediol dibenzoate, 2-methyl-4-ethyl-3,5-heptanediol dibenzoate, 2-methyl-5-ethyl-3,5-heptanediol dibenzoate, 3-methyl-3-ethyl-3,5-heptanediol dibenzoate, 3-methyl-4-ethyl-3,5-heptanediol dibenzoate, 3-methyl-5-ethyl-3,5-heptanediol dibenzoate, 4-methyl-3-ethyl-3,5-heptanediol dibenzoate, 4-methyl-4-ethyl-3,5-heptanediol dibenzoate, 4-methyl-5-ethyl-3,At least one of 5-heptanediol dibenzoate, 2-methyl-3-propyl-3,5-heptanediol dibenzoate, 2-methyl-4-propyl-3,5-heptanediol dibenzoate, 2-methyl-5-propyl-3,5-heptanediol dibenzoate, 3-methyl-3-propyl-3,5-heptanediol dibenzoate, 3-methyl-4-propyl-3,5-heptanediol dibenzoate, 3-methyl-5-propyl-3,5-heptanediol dibenzoate, 4-methyl-3-propyl-3,5-heptanediol dibenzoate, 4-methyl-4-propyl-3,5-heptanediol dibenzoate and 4-methyl-5-propyl-3,5-heptanediol dibenzoate;

[0042] More preferably, the diol ester compound is 2,4-pentanediol dibenzoate and / or 3,5-heptanediol dibenzoate.

[0043] In the present invention, the magnesium source can be various magnesium-containing compounds that can be used as catalysts for olefin polymerization, for example, the magnesium source can be a magnesium halide, an alcoholate of magnesium, a halogenated alcoholate of magnesium, or a magnesium halide adduct carrier, etc. The magnesium halide can be, for example, magnesium chloride and / or magnesium bromide. The alcoholate of magnesium can be, for example, diethoxymagnesium. The halogenated alcoholate of magnesium can be, for example, ethoxymagnesium chloride. The types of the magnesium halide adduct carrier are well known to those skilled in the art, for example, the magnesium halide adduct carriers disclosed in patent documents CN1091748, CN101050245, CN101486722, CN102796132B, CN102796129B and CN102796128B, and the relevant contents disclosed in these patent documents are all introduced into the present invention as a reference.

[0044] The specific preparation method of the magnesium halide adduct carrier may include the following steps: mixing the components forming the magnesium halide adduct, heating the reaction to generate a magnesium halide adduct melt, the reaction temperature is 90-140°C, placing the components in a cooling medium after high shearing in a dispersion medium to form spherical magnesium halide adduct particles, washing and drying to obtain a spherical carrier, and selectively adding an internal electron donor during or after the high shearing process. The high shearing process can be obtained by conventional methods, such as high-speed stirring method (such as CN1330086), spray method (such as US6020279), high-gravity rotating bed (such as CN1580136), and emulsifier method (CN1463990). The dispersion medium may be, for example, a hydrocarbon inert solvent, such as one or more of kerosene, white oil, silicone oil, paraffin oil, vaseline oil, etc. The cooling medium may be, for example, selected from one or more of pentane, hexane, heptane, petroleum ether, raffinate oil, etc.

[0045] According to the present invention, the titanium source can be a conventional choice in the art, for example, the titanium source can be a titanium source having a general formula of Ti(OR′) 3-a Z a and / or Ti(OR′) 4-b Z b A titanium compound wherein R′ is C1-C 20 alkyl, Z is F, Cl, Br or I, a is an integer of 1 to 3, and b is an integer of 1 to 4. Preferably, the titanium source is one or more of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, tributoxytitanium chloride, dibutoxytitanium dichloride, butoxytitanium trichloride, triethoxytitanium chloride, diethoxytitanium dichloride, ethoxytitanium trichloride and titanium trichloride.

[0046] The catalyst component for olefin polymerization of the present invention can be prepared by conventional methods. For example, the preparation method of the catalyst component comprises: contacting a magnesium source with a titanium source, and adding an internal electron donor in one or more time periods before, during and after the contacting reaction of the magnesium source with the titanium source. The components of the internal electron donor can be added separately or simultaneously. The internal electron donor contains monoether compounds, diether compounds and glycol ester compounds.

[0047] Specifically, the reaction of the magnesium source and the titanium source can be carried out in the same manner as in the prior art, for example, the titanium source can be cooled to below 0°C (preferably -5 to -25°C), then the magnesium source is added, and the mixture is stirred and mixed at this temperature for 10-60 minutes, and then the temperature is raised to the reaction temperature (i.e., about 60-130°C), and maintained at the reaction temperature for 0.5-10 hours. In the method for preparing the catalyst component for olefin polymerization, the internal electron donor is added in one or more time periods before, during and after the reaction of the magnesium source and the titanium source. The time period before the reaction of the magnesium source and the titanium source refers to the time period after the magnesium source is added to the reactor and before the temperature is raised to the reaction temperature.

[0048] According to a second aspect of the present invention, the present invention provides a catalyst for olefin polymerization, the catalyst comprising a reaction product of the following components:

[0049] (i) the above-mentioned catalyst components;

[0050] (ii) at least one alkylaluminum compound; and

[0051] (iii) Optional external electron donor.

[0052] In the present invention, the alkyl aluminum compound may be any of various alkyl aluminum compounds commonly used in the art. For example, the general formula of the alkyl aluminum may be AlR 16 R 16 ′R16 ″, where R 16 , R 16 ′ and R 16 "are each independently a C1-C8 alkyl group, and one or two of the groups are optionally halogen, and the hydrogen on the alkyl group is optionally substituted by a halogen atom.

[0053] Specific examples of the C1-C8 alkyl group may include, but are not limited to, methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl, and n-octyl, and the halogen may include fluorine, chlorine, bromine, and iodine.

[0054] Specifically, the alkylaluminum compound can be selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum monochloride, diisobutylaluminum monochloride, di-n-butylaluminum monochloride, di-n-hexylaluminum monochloride, monoethylaluminum dichloride, monoisobutylaluminum dichloride, mono-n-butylaluminum dichloride and mono-n-hexylaluminum dichloride.

[0055] According to the present invention, the amount of the alkyl aluminum compound can be the conventional amount in the art. The molar ratio of aluminum in the alkyl aluminum compound to titanium in the catalyst component can be 1-2000:1, preferably 20-500:1, more preferably 30-200:1.

[0056] In the present invention, the external electron donor can be any of various external electron donors commonly used in the art. For example, the external electron donor can be selected from at least one of carboxylic acids, carboxylic anhydrides, carboxylic esters, ketones, ethers, alcohols, lactones, organophosphorus compounds and organosilicon compounds.

[0057] Preferably, the external electron donor is selected from a group containing at least one Si-OR 19 bond, and the general formula is (R 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, where R 17 , R 18 and R 19 C1-C 18 The hydrocarbon group optionally contains heteroatoms, x and y are each independently an integer of 0-2, z is an integer of 1-3, and the sum of x, v and z is 4. 17 , R 18 Preferably C3-C 10 The alkyl or cycloalkyl group may contain heteroatoms; R 19 Preferably C1-C 10 The alkyl group may contain a heteroatom.

[0058] Specifically, the external electron donor can be selected from at least one of cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl-tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane and (1,1,1-, trifluoro-2-propyl)-methyldimethoxysilane.

[0059] According to the present invention, the amount of the external electron donor can be a conventional amount in the art. The molar ratio of the external electron donor to the aluminum in the alkyl aluminum compound can be 1:1-200, preferably 1:2.5-100.

[0060] According to the present invention, in the preparation process of the catalyst for olefin polymerization, the alkyl aluminum compound and the optional external electron donor can be mixed with the catalyst components for olefin polymerization separately and then reacted, or the alkyl aluminum compound and the optional external electron donor can be mixed first and then mixed with the catalyst components for olefin polymerization and reacted.

[0061] The third aspect of the present invention provides use of the above catalyst in olefin polymerization.

[0062] When the catalyst of the present invention is used for olefin polymerization, the catalyst components, alkyl aluminum compound, and optional external electron donor can be added to the polymerization reactor separately, or mixed and added to the polymerization reactor, or the olefin can be prepolymerized by a prepolymerization method known in the industry and then added to the polymerization reactor.

[0063] In the present invention, the specific type of olefin, the polymerization method and conditions of olefin can be conventionally selected according to the prior art.

[0064] The catalyst of the present invention is particularly suitable for the homopolymerization and copolymerization of olefins of the general formula CH2=CHR, wherein R is hydrogen, C1-C6 alkyl or C6-C 12 The aromatic group.

[0065] According to the present invention, the polymerization reaction of the olefin can be carried out according to the existing method, specifically, under the protection of an inert gas, in a liquid phase monomer or an inert solvent containing a polymerizable monomer, or in a gas phase, or by a combined polymerization process in a gas-liquid phase. The temperature of the polymerization reaction can generally be 0-150°C, preferably 60-90°C. The pressure of the polymerization reaction can be normal pressure or higher, for example, 0.01-10MPa, preferably 0.01-5MPa, more preferably 0.1-4Mpa, and the pressure of the present invention refers to the gauge pressure. In the polymerization process, hydrogen can be used as a polymer molecular weight regulator and added to the reaction system to adjust the molecular weight and melt index of the polymer. In addition, in the polymerization process of the olefin, the type and amount of the inert gas and solvent are well known to those skilled in the art and will not be repeated here.

[0066] Parameters not limited in the present invention are all conventional technical means in the art.

[0067] The present invention will be further described below with reference to the following examples, but is not limited to these examples.

[0068] In the following examples and comparative examples:

[0069] Polymer melt index: measured according to GB3682-2000 at 230°C and 2.16 kg load.

[0070] Isotactic index of polymer: Determined by heptane extraction method (6 hours of boiling heptane extraction): 2 grams of dry polymer sample is placed in an extractor and extracted with boiling heptane for 6 hours. The residue is dried to constant weight and the ratio of the polymer weight (g) to 2 (g) is the isotactic index.

[0071] Examples 1 to 6 are used to illustrate the catalyst component and catalyst for olefin polymerization and application of the present invention.

[0072] Example 1

[0073] (1) Preparation of catalyst components

[0074] In a 300mL glass reaction bottle, add 80mL of titanium tetrachloride and cool to -20°C, add 37mmol of a magnesium halide carrier (prepared according to the method disclosed in Example 1 of CN1267508C) in terms of magnesium element, then heat to 110°C, and add 1.2mmol of butyl ether, 8mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, and 2.4mmol of 2,4-pentanediol dibenzoate during the heating process. After maintaining at 110°C for 30min, filter out the liquid, wash with titanium tetrachloride, then wash with hexane, and vacuum dry to obtain the catalyst component Cat-1 for olefin polymerization.

[0075] (2) Propylene liquid phase bulk polymerization

[0076] The bulk polymerization of propylene in liquid phase was carried out in a 5L stainless steel autoclave. Under nitrogen protection, 2mL of triethylaluminum hexane solution (concentration of 0.5mmol / mL), 0.1mL of cyclohexylmethyldimethoxysilane (CHMMS) hexane solution (concentration of 0.1mmol / mL) and 6mg of the above-mentioned catalyst component Cat-1 for olefin polymerization were added to the reactor in sequence. The autoclave was closed, and 6.5L of hydrogen (standard volume) and 2.3L of liquid propylene were added. After heating to 70°C and reacting for 1 hour, the temperature was lowered, the pressure was released, and the material was discharged. The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0077] Example 2

[0078] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that the amounts of butyl ether, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane and 2,4-pentanediol dibenzoate added during the heating process were 2.3 mmol, 7.8 mmol and 2.3 mmol, respectively, to obtain a catalyst component Cat-2 for olefin polymerization.

[0079] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0080] Example 3

[0081] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that the amounts of butyl ether, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane and 2,4-pentanediol dibenzoate added during the heating process were 4.7 mmol, 7.2 mmol and 2 mmol, respectively, to obtain catalyst component Cat-3 for olefin polymerization.

[0082] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0083] Example 4

[0084] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that 2,4-pentanediol dibenzoate was not added during the heating process, but 3,5-heptanediol dibenzoate was added, and the amounts of butyl ether, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane and 3,5-heptanediol dibenzoate added were 2.5 mmol, 9 mmol and 1.8 mmol, respectively, to obtain a catalyst component Cat-4 for olefin polymerization.

[0085] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0086] Example 5

[0087] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was not added during the heating process, but 9,9-dimethoxymethylfluorene was added, and the amounts of butyl ether, 9,9-dimethoxymethylfluorene and 2,4-pentanediol dibenzoate added were 2.3 mmol, 6.2 mmol and 5 mmol, respectively, to obtain a catalyst component Cat-5 for olefin polymerization.

[0088] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0089] Example 6

[0090] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that butyl ether was not added during the heating process, but methyl butyl ether was added, and the amounts of methyl butyl ether, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane and 2,4-pentanediol dibenzoate added were 1.5 mmol, 7.5 mmol and 2 mmol, respectively, to obtain a catalyst component Cat-6 for olefin polymerization.

[0091] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0092] Comparative Example 1

[0093] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that in the preparation process of the catalyst component, no butyl ether and 2,4-pentanediol dibenzoate were added, and only 11.6 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was added to obtain the catalyst component DCat-1 for olefin polymerization; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0094] Comparative Example 2

[0095] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that in the preparation process of the catalyst component, no butyl ether and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added, and only 11.6 mmol of 2,4-pentanediol dibenzoate was added to obtain the catalyst component DCat-2 for olefin polymerization; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0096] Comparative Example 3

[0097] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that during the preparation of the catalyst component, 2,4-pentanediol dibenzoate and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were not added, and only 11.6 mmol of butyl ether was added to obtain the catalyst component DCat-3 for olefin polymerization; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0098] Comparative Example 4

[0099] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that in the preparation process of the catalyst component, no butyl ether was added, and only 4.6 mmol of 2,4-pentanediol dibenzoate and 7 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added to obtain the catalyst component DCat-4 for olefin polymerization; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0100] Table 1

[0101] serial number Catalyst components Polymer isotactic index (%) Polymer melt index (g / 10min) Example 1 Cat-1 97.6 45 Example 2 Cat-2 97.4 47 Example 3 Cat-3 97.7 40 Example 4 Cat-4 97.8 51 Example 5 Cat-5 97.3 43 Example 6 Cat-6 97.4 45 Comparative Example 1 DCat-1 94.7 70 Comparative Example 2 DCat-2 94.2 25 Comparative Example 3 DCat-3 67.1 137 Comparative Example 4 DCat-4 96.9 34

[0102] It can be seen from Table 1 that when the internal electron donor contains monoether compounds, diether compounds and glycol ester compounds at the same time, the catalyst can have both high hydrogen modulation sensitivity and stereospecificity, that is, the polymer obtained by polymerization has both high isotactic index and melt index; and the catalyst component of the present invention does not contain phthalate compounds (plasticizers).

[0103] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A catalyst component for olefin polymerization, characterized in that The catalyst component comprises the reaction product of the following components: a magnesium source, a titanium source and an internal electron donor; The internal electron donor is composed of a monoether compound, a diether compound and a glycol ester compound, and the molar ratio of the monoether compound, the diether compound and the glycol ester compound is 0.2-3:0.1-8:1; The monoether compound is selected from at least one of the monoether compounds represented by formula (1): R7OR8 formula (1) In formula (1), R7 and R8 are each independently selected from C1-C 10 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Arylalkyl or C7-C 20 The hydrogen atoms on the alkyl, aryl, alkaryl and aralkyl groups are optionally substituted by halogen atoms; The diether compound is selected from at least one of the diether compounds represented by formula (2): In formula (2), R Ⅰ , R Ⅱ , R Ⅲ , R Ⅳ , R Ⅴ and R Ⅵ the same or different, each independently selected from hydrogen, halogen atoms, C1-C 20 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl or C7-C 20 The aralkyl group, R Ⅰ -R Ⅵ The groups of R may be optionally bonded to form a ring; Ⅶ and R Ⅷ The same or different, each independently selected from C1-C 20 Straight or branched alkyl, C3-C 20 Cycloalkyl, C6-C 20 Aryl, C7-C 20 Alkyl or C7-C 20 Aralkyl; The diol ester compound is selected from at least one of the diol ester compounds represented by formula (3): In formula (3), R1 and R2 are the same or different and are independently C1-C 10 Straight or branched alkyl, C3-C 20 Substituted or unsubstituted cycloalkyl, C6-C 20 Substituted or unsubstituted aryl, C7-C 20 Substituted or unsubstituted aralkyl or C7-C 20 The aromatic ring in the aryl, aralkyl or alkaryl group is optionally substituted by one or more selected from halogen, C1-C6 straight chain or branched alkyl and C1-C6 alkoxy; the brackets "[]" indicate that there are n carbon atoms bonded in sequence, and each carbon atom is also bonded to 2 substituents, that is, there are n carbon atoms and R in the brackets. 1 , R 2 , R 3 …R 2n There are 2n substituents in total; R3, R4, R5, R6 and R 1 -R 2n are the same or different and are independently hydrogen, halogen, C1-C 20 Straight or branched alkyl, C3-C 20 Substituted or unsubstituted cycloalkyl, C6-C 20 Substituted or unsubstituted aryl, C7-C 20 Substituted or unsubstituted alkylaryl, C7-C 20 Substituted or unsubstituted aralkyl, C2-C 10 A straight chain or branched olefin group or C 10 -C 20 R3, R4, R5, R6 and R 1 -R 2n Optionally contain heteroatoms, the heteroatoms are one or more of nitrogen, oxygen, sulfur, silicon, halogen and phosphorus; or, R3, R4, R5, R6 and R 1 -R 2n Two or more of them are bonded to each other to form a saturated or unsaturated ring; n is an integer of 0-10. When n=0, in the diol ester compound represented by formula (3), the carbon atoms of the substituents R3 and R4 are directly bonded to the carbon atoms of the substituents R5 and R6.

2. The catalyst component for olefin polymerization according to claim 1, wherein The molar ratio of the magnesium source calculated as magnesium element, the titanium source calculated as titanium element and the internal electron donor is 1:15-180:0.1-0.9; the molar ratio of the monoether compound, the diether compound and the glycol ester compound is 0.5-2.5:0.5-6:

1.

3. The catalyst component for olefin polymerization according to claim 2, wherein The molar ratio of the magnesium source calculated as magnesium element, the titanium source calculated as titanium element and the internal electron donor is 1:18-130:0.15-0.

6.

4. The catalyst component for olefin polymerization according to claim 1, wherein The monoether compound is selected from at least one of ethyl ether, methyl butyl ether, butyl ether, ethyl butyl ether, dimethyl ether, chloroethyl n-propyl ether, dipropyl ether, methyl ethyl ether, anisole and amyl ether.

5. The catalyst component for olefin polymerization according to claim 4, wherein The monoether compound is butyl ether.

6. The catalyst component for olefin polymerization according to claim 1, wherein 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-(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-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane and at least one of 9,9-dimethoxymethylfluorene.

7. The catalyst component for olefin polymerization according to claim 6, wherein The diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane or 9,9-dimethoxymethylfluorene.

8. The catalyst component for olefin polymerization according to claim 1, wherein The diol ester compound is selected from 1,3-propylene glycol dibenzoate, 2-methyl-1,3-propylene glycol dibenzoate, 2-ethyl-1,3-propylene glycol dibenzoate, 2-propyl-1,3-propylene glycol dibenzoate, 2-butyl-1,3-propylene glycol dibenzoate, 2,2-dimethyl-1,3-propylene glycol dibenzoate, 2-ethyl-2-butyl-1,3-propylene glycol dibenzoate, 2,2-diethyl-1,3-propylene glycol dibenzoate, 2-methyl-2-propyl-1,3-propylene glycol dibenzoate, 2-isopropyl-2-isopentyl-1,3-propylene glycol dibenzoate, 2,4-pentanediol dibenzoate, 3-methyl-2,4-pentanediol dibenzoate, 3-ethyl-2, 4-Pentanediol dibenzoate, 3-propyl-2,4-pentanediol dibenzoate, 3-butyl-2,4-pentanediol dibenzoate, 3,3-dimethyl-2,4-pentanediol dibenzoate, 2-methyl-1,3-pentanediol dibenzoate, 2,2-dimethyl-1,3-pentanediol dibenzoate, 2-ethyl-1,3-pentanediol dibenzoate, 2-butyl-1,3-pentanediol dibenzoate, 2-propyl-1,3-pentanediol dibenzoate, 2,2,4-trimethyl-1,3-pentanediol dibenzoate, 3-methyl-3-butyl-2,4-pentanediol dibenzoate, 2,2-dimethyl-1,5-pentanediol dibenzoate, 1,6-hexanediol dibenzoate, 6-heptene-2, 4-heptene diol dibenzoate, 2-methyl-6-heptene-2,4-heptene diol dibenzoate, 3-methyl-6-heptene-2,4-heptene diol dibenzoate, 4-methyl-6-heptene-2,4-heptene diol dibenzoate, 5-methyl-6-heptene-2,4-heptene diol dibenzoate, 6-methyl-6-heptene-2,4-heptene diol dibenzoate, 3-ethyl-6-heptene-2,4-heptene diol dibenzoate, 4-ethyl-6-heptene-2,4-heptene diol dibenzoate, 5-ethyl-6-heptene-2,4-heptene diol dibenzoate, 6-ethyl-6-heptene-2,4-heptene diol dibenzoate, 3-propyl-6-heptene-2,4-heptene diol dibenzoate, 4-propyl-6 -heptene-2,4-heptanediol dibenzoate, 5-propyl-6-heptene-2,4-heptanediol dibenzoate, 6-propyl-6-heptene-2,4-heptanediol dibenzoate, 3-butyl-6-heptene-2,4-heptanediol dibenzoate, 4-butyl-6-heptene-2,4-heptanediol dibenzoate, 5-butyl-6-heptene-2,4-heptanediol dibenzoate, 6-butyl-6-heptene-2,4-heptanediol dibenzoate, 3,5-dimethyl-6-heptene-2,4-heptanediol dibenzoate, 3,5-diethyl-6-heptene-2,4-heptanediol dibenzoate, 3,5-dipropyl-6-heptene-2,4-heptanediol dibenzoate, 3,5-dibutyl-6-heptene-2,4-heptanediol dibenzoate, 3,3-dimethyl-6-heptene-2,4-heptanediol dibenzoate, 3,3-diethyl-6-heptene-2,4-heptanediol dibenzoate, 3,3-dipropyl-6-heptene-2,4-heptanediol dibenzoate, 3,3-dibutyl-6-heptene-2,4-heptanediol dibenzoate, 3,5-heptanediol dibenzoate, 2-methyl-3,5-heptanediol dibenzoate, 3-methyl-3,5-heptanediol dibenzoate, 4-methyl-3,5-heptanediol dibenzoate, 5-methyl-3,5-heptanediol dibenzoate, 6-methyl-3,5-heptanediol dibenzoate, 3-ethyl-3,5-heptanediol dibenzoate, 4-ethyl-3,5-heptanediol dibenzoate benzoate, 5-ethyl-3,5-heptanediol dibenzoate, 3-propyl-3,5-heptanediol dibenzoate, 4-propyl-3,5-heptanediol dibenzoate, 3-butyl-3,5-heptanediol dibenzoate, 2,3-dimethyl-3,5-heptanediol dibenzoate, 2,4-dimethyl-3,5-heptanediol dibenzoate, 2,5-dimethyl-3,5-heptanediol dibenzoate, 2,6-dimethyl-3,5-heptanediol dibenzoate, 3,3-dimethyl-3,5-heptanediol dibenzoate, 4,4-dimethyl-3,5-heptanediol dibenzoate, 6,6-dimethyl-3,5-heptanediol dibenzoate, 3,4-dimethyl-3,5-heptanediol dibenzoate, 3,5-dimethyl-3,5-heptanediol dibenzoate Methyl-3,5-heptanediol dibenzoate, 3,6-dimethyl-3,5-heptanediol dibenzoate, 4,5-dimethyl-3,5-heptanediol dibenzoate, 4,6-dimethyl-3,5-heptanediol dibenzoate, 2-methyl-3-ethyl-3,5-heptanediol dibenzoate, 2-methyl-4-ethyl-3,5-heptanediol dibenzoate, 2-methyl-5-ethyl-3,5-heptanediol dibenzoate, 3-methyl-3-ethyl-3,5-heptanediol dibenzoate, 3-methyl-4-ethyl-3,5-heptanediol dibenzoate, 3-methyl-5-ethyl-3,5-heptanediol dibenzoate, 4-methyl-3-ethyl-3,5-heptanediol dibenzoate, 4-methyl-4-ethyl At least one of 2-methyl-3,5-heptanediol dibenzoate, 4-methyl-5-ethyl-3,5-heptanediol dibenzoate, 2-methyl-3-propyl-3,5-heptanediol dibenzoate, 2-methyl-4-propyl-3,5-heptanediol dibenzoate, 2-methyl-5-propyl-3,5-heptanediol dibenzoate, 3-methyl-3-propyl-3,5-heptanediol dibenzoate, 3-methyl-4-propyl-3,5-heptanediol dibenzoate, 3-methyl-5-propyl-3,5-heptanediol dibenzoate, 4-methyl-3-propyl-3,5-heptanediol dibenzoate, 4-methyl-4-propyl-3,5-heptanediol dibenzoate and 4-methyl-5-propyl-3,5-heptanediol dibenzoate.

9. The catalyst component for olefin polymerization according to claim 8, wherein The diol ester compound is 2,4-pentanediol dibenzoate and / or 3,5-heptanediol dibenzoate.

10. The catalyst component for olefin polymerization according to claim 1, wherein The magnesium source is selected from magnesium halide, magnesium alcoholate, magnesium haloalcoholate or magnesium halide adduct carrier; The titanium source is selected from the general formula Ti(OR′) 3-a Z a and / or Ti(OR′) 4-b Z b A titanium compound wherein R′ is C1-C 20 wherein the alkyl group is an alkyl group, Z is F, Cl, Br or I, a is an integer of 1-3, and b is an integer of 1-4.

11. The catalyst component for olefin polymerization according to claim 10, wherein The magnesium source is selected from magnesium chloride, magnesium bromide, diethoxymagnesium or ethoxymagnesium chloride carrier.

12. The catalyst component for olefin polymerization according to claim 10, wherein The titanium source is selected from one or more of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, tributoxytitanium chloride, dibutoxytitanium dichloride, butoxytitanium trichloride, triethoxytitanium chloride, diethoxytitanium dichloride, ethoxytitanium trichloride and titanium trichloride.

13. A catalyst for olefin polymerization, characterized in that: The catalyst comprises the reaction product of: (i) the catalyst component according to any one of claims 1 to 12; (ii) at least one alkylaluminum compound; and (iii) Optional external electron donor.

14. The catalyst for olefin polymerization according to claim 13, wherein The general formula of the alkyl aluminum compound is AlR 16 R 16 ′R 16 ″, where R 16 , R 16 ′ and R 16 "each independently represents a C1-C8 alkyl group, and one or two of the groups are optionally halogen, and the hydrogen on the alkyl group is optionally replaced by a halogen atom; The molar ratio of aluminum in the alkyl aluminum compound to titanium in the catalyst component is 1-2000:

1.

15. The catalyst for olefin polymerization according to claim 14, wherein The alkylaluminum compound is selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum monochloride, diisobutylaluminum monochloride, di-n-butylaluminum monochloride, di-n-hexylaluminum monochloride, monoethylaluminum dichloride, monoisobutylaluminum dichloride, mono-n-butylaluminum dichloride and mono-n-hexylaluminum dichloride.

16. The catalyst for olefin polymerization according to claim 14, wherein The molar ratio of aluminum in the alkyl aluminum compound to titanium in the catalyst component is 20-500:

1.

17. The catalyst for olefin polymerization according to claim 16, wherein The molar ratio of aluminum in the alkyl aluminum compound to titanium in the catalyst component is 30-200:

1.

18. The catalyst for olefin polymerization according to claim 13, wherein The external electron donor is selected from a group containing at least one Si-OR 19 bond, and the general formula is (R 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, where R 17 , R 18 and R 19 C1-C 18 A hydrocarbon group optionally containing heteroatoms, x and y are each independently an integer of 0-2, z is an integer of 1-3, and the sum of x, y, and z is 4; The molar ratio of the external electron donor to the aluminum in the alkyl aluminum compound is 1:1-200.

19. The catalyst for olefin polymerization according to claim 18, wherein R 17 , R 18 C3-C 10 The alkyl or cycloalkyl group may contain heteroatoms; R 19 C1-C 10 The alkyl group may contain a heteroatom.

20. The catalyst for olefin polymerization according to claim 19, wherein The external electron donor is selected from at least one of cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl-tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane and (1,1,1-trifluoro-2-propyl)-methyldimethoxysilane.

21. The catalyst for olefin polymerization according to claim 19, wherein The molar ratio of the external electron donor to the aluminum in the alkyl aluminum compound is 1:2.5-100.

22. Use of the catalyst according to any one of claims 13 to 21 in olefin polymerization.

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