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

Abstract

This invention belongs to the field of olefin polymerization technology, and relates to a solid catalyst component for olefin polymerization, its preparation method, the catalyst, and its application. The catalyst component comprises the reaction products of the following components: a magnesium source, a titanium source, and an internal electron donor; the internal electron donor comprises succinic acid monoester compounds, glycol ester compounds, and diether compounds. The preparation method includes the following steps: contacting a magnesium source with a titanium source, adding an internal electron donor before, during, and after the contacting reaction, then treating with the titanium source once or multiple times, and finally washing with an inert solvent to obtain the solid catalyst component. This invention uses an internal electron donor comprising succinic acid monoester compounds, glycol ester compounds, and diether compounds; the catalyst is a non-plasticizing catalyst; and it features stable release of polymerization activity, high stereospecificity, and high activity.

Description

Technical Field

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

[0002] Current continuous processes for polyolefin production often employ multiple reactors connected in series, such as two liquid-phase bulk polymerization reactors, a liquid-phase bulk polymerization reactor and a gas-phase polymerization reactor connected in series, or two or three gas-phase reactors connected in series. During production, the residence time and other parameters in each reactor are controlled according to the specific product performance requirements and process conditions. The total residence time in each reactor is generally controlled between 2 and 4 hours. This necessitates that the Zn catalyst used releases its activity smoothly and uniformly throughout the polymerization process. Otherwise, problems will arise such as excessively high activity in the early stages, making the reaction difficult to control, followed by insufficient activity in the later stages. This will directly lead to a decline in product quality or even failure to meet performance requirements. Therefore, the smooth and uniform release of Zn catalyst polymerization activity is beneficial for both the stability and controllability of the polymerization process and the adjustment of various parameters during polymerization to produce products with superior performance.

[0003] Furthermore, the stereotactic orientation of the catalyst determines the isotactic index of the polymer. A higher isotactic index indicates greater regularity and crystallinity, leading to increased mechanical properties such as hardness, stiffness, modulus, fracture strength, and yield strength. Melting point, thermal stability, aging resistance, and radiation resistance also improve accordingly. To develop high-performance polyolefin products, the stereotactic orientation of the catalyst should be further enhanced.

[0004] Internal electron donor compounds, as important components of Ziegler-Natta catalysts, play a decisive role in key indicators such as polymerization activity and activity decay, hydrogen sensitivity, polymer isotacticity, polymer molecular weight, and molecular weight distribution. The development of electron donor compounds has led to continuous upgrading of polyolefin catalysts. Many compounds can serve as internal electron donors in Ziegler-Natta catalysts: polycarboxylic acids, carboxylic esters, acid anhydrides, ketones, ethers, and their derivatives. Among these, diaromatic carboxylic esters are commonly used industrially, such as di-n-butyl phthalate or diisobutyl phthalate (US6365685B1, US20010020073A1).

[0005] Although phthalate-based catalysts with internal electron donors have been widely used, the residues of phthalate in polypropylene products during the use of these catalysts can affect human fertility. Consequently, various countries have enacted regulations to restrict the use of plastic products with excessive phthalate content. Therefore, in the development of olefin polymerization catalysts, the use of phthalate compounds should be avoided during the preparation process.

[0006] Therefore, it is of great significance to develop highly stereooriented catalysts that do not contain phthalate compounds (plasticizers) and have stable polymerization activity release. Summary of the Invention

[0007] The purpose of this invention is to provide a catalyst component for olefin polymerization, its preparation method, catalyst, and application. The obtained catalyst does not contain phthalate compounds (plasticizers) and has the characteristics of stable release of polymerization activity, high stereodirection, and high activity.

[0008] To achieve the objectives of the present invention, a first aspect of the present invention provides a catalyst composition for olefin polymerization, the catalyst composition comprising the reaction products of a magnesium source, a titanium source, and an internal electron donor;

[0009] The internal electron donor includes succinic acid monoester compounds, diol ester compounds, and diether compounds.

[0010] A second aspect of the present invention provides a method for preparing the solid catalyst component for olefin polymerization, comprising the following steps:

[0011] A magnesium source and a titanium source are brought into contact and reacted. An internal electron donor is added before, during, and after the contact and reaction of the magnesium source and the titanium source. The mixture is then treated once or multiple times with a titanium source and washed with an inert solvent to obtain the solid catalyst component.

[0012] A third aspect of the present invention provides a catalyst for olefin polymerization, the catalyst comprising:

[0013] (i) the solid catalyst components described herein;

[0014] (ii) at least one alkylaluminum compound; and

[0015] (iii) Optional external electron donor compounds.

[0016] A fourth aspect of the invention provides the application of the catalyst described above for olefin polymerization in olefin polymerization reactions.

[0017] This invention employs an internal electron donor comprising succinic acid monoester compounds, glycol ester compounds, and diether compounds, without using phthalate ester compounds. Therefore, the catalyst is a non-plasticizing catalyst, and it has the characteristics of stable polymerization activity release, high stereodirection, and high activity.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Detailed Implementation

[0019] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0020] To achieve the objectives of the present invention, a first aspect of the present invention provides a catalyst composition for olefin polymerization, the catalyst composition comprising the reaction products of a magnesium source, a titanium source, and an internal electron donor;

[0021] The internal electron donor includes succinic acid monoester compounds, diol ester compounds, and diether compounds.

[0022] According to the present invention, the total content of the succinic acid monoester compound, the diol ester compound, and the diether compound is 70-100% by weight, preferably 80-100% by weight, based on the total weight of the internal electron donor.

[0023] In this invention, the succinic acid monoester compound can be any succinic acid monoester compound capable of serving as an internal electron donor in a catalyst for olefin polymerization. Preferably, the succinic acid monoester compound is selected from at least one of the compounds shown in formula (1):

[0024]

[0025] In equation (1), R1 is C1-C 20 The straight-chain or branched alkyl, cycloalkyl, aryl, aralkyl, or alkylaryl groups, where R2 to R5 are each independently selected from hydrogen, C1-C6, C2-C5, C2 ... 20 The straight-chain or branched alkyl, cycloalkyl, aryl, aralkyl or alkylaryl groups, optionally containing heteroatoms, and R2 to R5 attached to the same carbon atom can be bonded to form a ring.

[0026] Preferably, the succinic acid monoester compound is selected from at least one of 4-methoxy-4-oxobutyric acid, 4-ethoxy-4-oxobutyric acid, 4-propoxy-4-oxobutyric acid, 4-tert-butoxy-4-oxobutyric acid, and 4-benzyl-4-oxobutyric acid; more preferably, the succinic acid monoester compound is 4-tert-butoxy-4-oxobutyric acid.

[0027] According to the present invention, the glycol ester compound can be any glycol ester compound capable of serving as an internal electron donor in a catalyst for olefin polymerization, preferably a glycol ester compound represented by Formula I.

[0028]

[0029] In equation (2), R1 and R2 may be the same or different, and each is independently C1-C 10 Straight-chain or branched alkyl groups, C3-C 20 Substituted or unsubstituted cycloalkyl, C6-C 20 Substituted or unsubstituted aryl groups, C7-C 20 Substituted or unsubstituted aralkyl groups and C7-C 20 The aryl, aralkyl, or alkylaryl group is a substituted or unsubstituted alkyl group, wherein the aromatic ring in the aryl, aralkyl, or alkylaryl group is optionally substituted by one or more of a halogen, a C1-C6 straight-chain or branched alkyl group, and a C1-C6 alkoxy group; in Formula I, the contents of the square brackets "[]" indicate that there are n carbon atoms sequentially bonded, and each carbon atom is also bonded to 2 substituents, that is, there are a total of n carbon atoms and R within the square brackets. 1 R 2 R 3 …R 2n 2n substituents.

[0030] R3, R4, R5, R6 and R 1 -R 2n Whether the elements are the same or different, they are independently hydrogen, halogen, or C1-C. 20 Straight-chain or branched alkyl groups, C3-C 20 Substituted or unsubstituted cycloalkyl, C6-C 20 Substituted or unsubstituted aryl groups, C7-C 20 Substituted or unsubstituted alkylaryl groups, C7-C 20 Substituted or unsubstituted aralkyl, C2-C 10 Straight-chain or branched olefin groups and C 10 -C 20 One of the fused-ring aryl groups, R3, R4, R5, R6 and R 1 -R 2n Optionally contains heteroatoms, said heteroatoms being one or more of nitrogen, oxygen, sulfur, silicon, halogens, and phosphorus;

[0031] Or, R3, R4, R5, R6 and R 1 -R 2n Two or more of them are bonded to each other to form saturated or unsaturated rings;

[0032] n is an integer from 0 to 10. When n = 0, in the diol ester compound shown in Formula I, the carbon atoms with substituents R3 and R4 are directly bonded to the carbon atoms with substituents R5 and R6.

[0033] In this invention, C1-C 20 Examples of straight-chain 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-pentadecanyl, n-hexadecyl, n-octadecyl, n-nonadecanyl, and n-eicosyl.

[0034] In this invention, C3-C 20 Examples of substituted or unsubstituted cycloalkyl groups 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] In this invention, C6-C 20 Examples of substituted or unsubstituted aryl groups may include, but are not limited to: phenyl, methylphenyl, ethylphenyl, 4-tert-butylphenyl, etc.

[0036] In this invention, C7-C 20 Substituted or unsubstituted arylalkyl groups refer to alkyl groups with aryl substituents having 7-20 carbon atoms. (C7-C) 20 Examples of substituted or unsubstituted aralkyl groups may include, but are not limited to, 3-phenylpropyl, benzyl, etc.

[0037] In this invention, C7-C 20 Substituted or unsubstituted alkylaryl groups refer to aryl groups with alkyl substituents having 7-20 carbon atoms. (C7-C) 20 Examples of substituted or unsubstituted alkylaryl groups may include, but are not limited to, methylphenyl, ethylphenyl, etc.

[0038] In this invention, 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] In this invention, C2-C 10Examples of straight-chain or branched olefin groups may include, but are not limited to: vinyl, propenyl, butenyl, pentenyl, octenyl, etc.

[0040] In this invention, C 10 -C 20 Examples of fused-ring aryl groups may include, but are not limited to: naphthyl, anthracene, phenanthryl, pyrene, etc.

[0041] According to the present invention, examples of the diol ester compounds may include, but are not limited to: 1,3-propanediol dibenzoate, 2-methyl-1,3-propanediol dibenzoate, 2-ethyl-1,3-propanediol dibenzoate, 2-propyl-1,3-propanediol dibenzoate, 2-butyl-1,3-propanediol dibenzoate, 2,2-dimethyl-1,3-propanediol dibenzoate, 2-ethyl-2-butyl-1,3-propanediol dibenzoate, 2,2-diethyl-1,3-propanediol dibenzoate, 2-methyl-2-propyl-1,3-propanediol dibenzoate, 2-isopropyl-2-isopentyl-1,3-propanediol 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-ethyl-1,3-pentanediol dibenzoate, 2-propyl-1,3-pentanediol dibenzoate, 2-butyl-1,3-pentanediol dibenzoate, 2,2-dimethyl-1,3-pentanediol dibenzoate, 2,2-dimethyl-1,3-pentanediol dibenzoate Diol 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, 2,2,4-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-heptenediol dibenzoate, 2-methyl-6-heptene-2,4-heptenediol dibenzoate, 3-methyl-6-heptene-2,4-heptenediol dibenzoate, 4-methyl-6-heptene-2,4-heptenediol dibenzoate Formate esters, 5-methyl-6-hepten-2,4-heptanediol dibenzoate, 6-methyl-6-hepten-2,4-heptanediol dibenzoate, 3-ethyl-6-hepten-2,4-heptanediol dibenzoate, 4-ethyl-6-hepten-2,4-heptanediol dibenzoate, 5-ethyl-6-hepten-2,4-heptanediol dibenzoate, 6-ethyl-6-hepten-2,4-heptanediol dibenzoate, 3-propyl-6-hepten-2,4-heptanediol dibenzoate, 4-propyl-6-hepten-2,4-heptanediol dibenzoate, 5-propyl-6-hepten-2,4-heptanediol dibenzoate, 6-propyl-6-hepten-2,4-heptanediol dibenzoate, 3-butyl-6-hepten-2,4-heptanediol dibenzoate,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- Hepten-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 Benzoic acid esters, 2,3-dimethyl-3,5-heptanediol dibenzoic acid esters, 2,4-dimethyl-3,5-heptanediol dibenzoic acid esters, 2,5-dimethyl-3,5-heptanediol dibenzoic acid esters, 2,6-dimethyl-3,5-heptanediol dibenzoic acid esters, 3,3-dimethyl-3,5-heptanediol dibenzoic acid esters, 4,4-dimethyl-3,5-heptanediol dibenzoic acid esters, 6,6-dimethyl-3,5-heptanediol dibenzoic acid esters, 2,6-dimethyl-3,5-heptanediol dibenzoic acid esters, 3,4-dimethyl-3,5-heptanediol dibenzoic acid esters, 3,5-dimethyl-3,5-heptanediol dibenzoic acid esters, 3,6-dimethyl-3,5-heptanediol dibenzoic acid esters, 4,5-dimethyl-3... 5-Heptanediol dibenzoate, 4,6-dimethyl-3,5-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-3,5-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, 4-methyl-5-propyl-3,5-heptanediol dibenzoate, etc.

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

[0043] 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 (3):

[0044]

[0045] In equation (3), R Ⅰ R Ⅱ R Ⅲ R Ⅳ R Ⅴ and R Ⅵ Whether the atoms are the same or different, they are each independently selected from hydrogen, halogen atoms, and C1-C atoms. 20 Straight-chain or branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 Aryl or C7-C 20 alkylaryl, R Ⅰ -R Ⅵ The groups can be optionally bonded to form a ring; R Ⅶ and R Ⅷ Whether the two are the same or different, they are each independently selected from C1-C. 20 Straight-chain or branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 alkylaryl or C7-C 20 Aryl groups.

[0046] 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.

[0047] More preferably, the diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane or 9,9-dimethoxymethylfluorene.

[0048] According to the present invention, the molar ratio of succinic acid monoester, glycol ester, and diether is 0.1-1.2:0.1-1.0:1, more preferably 0.15-0.75:0.12-0.65:1. Using the above-mentioned preferred amounts allows for better synergistic formulation of the three compounds, resulting in stable release of the catalyst's polymerization activity and high stereotropic orientation.

[0049] In this invention, the magnesium source can be any magnesium-containing compound suitable for use as an olefin polymerization catalyst. For example, the magnesium source can be magnesium halide, magnesium alcohol, magnesium halohydride, or magnesium halide adduct support. The magnesium halide can be, for example, magnesium chloride and / or magnesium bromide. The magnesium alcohol can be, for example, magnesium diethoxy. The magnesium halohydride can be, for example, magnesium ethoxychloride. The types of magnesium halide adduct supports are well known to those skilled in the art. For example, magnesium halide adduct supports disclosed in patent documents CN1091748, CN101050245, CN101486722, CN102796132B, CN102796129B, and CN102796128B are included in this invention for reference.

[0050] According to the present invention, the titanium source can be a conventional choice in the art; for example, the titanium source can be of the general formula Ti(OR′). 3-a Z a And / or Ti(OR′) 4-b Z b Titanium compounds, wherein R′ is C1-C 20 The alkyl group, Z is F, Cl, Br or I, a is an integer from 1 to 3, and b is an integer from 1 to 4. Preferably, the titanium source is one or more of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, tributoxytitanium chloride, dibutoxytitanium dichloride, butoxytitanium trichloride, triethoxytitanium chloride, diethoxytitanium dichloride, ethoxytitanium trichloride and titanium trichloride.

[0051] In this invention, the catalyst component contains 2-16 parts by weight of magnesium per part by weight of titanium, preferably 3-15 parts by weight, and more preferably 4-13 parts by weight; the content of internal electron donor is 2-17 parts by weight, preferably 3-15 parts by weight, and more preferably 4-13 parts by weight.

[0052] A second aspect of the present invention provides a method for preparing the solid catalyst component for olefin polymerization, comprising the following steps:

[0053] A magnesium source and a titanium source are brought into contact and reacted. An internal electron donor is added before, during, and after the contact and reaction of the magnesium source and the titanium source. The mixture is then treated once or multiple times with a titanium source and washed with an inert solvent to obtain the solid catalyst component.

[0054] The time period prior to 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.

[0055] Preferably, the reaction between the magnesium source and the titanium source can be carried out as follows: the titanium source is cooled to below 0°C (preferably -10 to -30°C), then the magnesium source is added, and the mixture is stirred at this temperature for 10-60 minutes. The temperature is then gradually increased to the reaction temperature (approximately 60-130°C), and during the heating process, succinic acid monoester compounds, glycol ester compounds, and diether compounds are added. This reaction temperature is maintained for 0.2-10 hours, preferably 0.5-5 hours. Afterward, the mixture is treated with the titanium source and then washed with an inert solvent.

[0056] In this invention, the molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor can be 1:12-200:0.1-1.5. Preferably, the molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor is 1:15-180:0.15-1.2.

[0057] A third aspect of the present invention provides a catalyst for olefin polymerization, the catalyst comprising:

[0058] (i) the solid catalyst components described herein;

[0059] (ii) at least one alkylaluminum compound; and

[0060] (iii) Optional external electron donor compounds.

[0061] In this invention, the alkylaluminum compound can be any of the various alkylaluminum compounds conventionally used in the art; for example, the general formula of the alkylaluminum can be AlR. n X 3-n In this , R is a C1 to C8 alkyl group, the hydrogen on the alkyl group is optionally replaced by a halogen atom, X is a halogen, and n is 1, 2 or 3.

[0062] Specific examples of the C1-C8 alkyl groups may include, but are not limited to: methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl, n-octyl, and the halogen may be fluorine, chlorine, bromine, or iodine.

[0063] Specifically, the alkylaluminum compound may be selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, di-n-hexylaluminum chloride, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, and di-n-hexylaluminum chloride.

[0064] According to the present invention, the amount of the alkylaluminum compound can be a conventional amount in the art. The molar ratio of aluminum in the alkylaluminum compound to titanium in the catalyst component can be 1-2000:1, preferably 20-500:1, and more preferably 30-300:1.

[0065] In this invention, the external electron donor can be any of the external electron donors commonly used in the art. For example, the external electron donor can be selected from at least one of carboxylic acids, carboxylic anhydrides, carboxylic esters, ketones, ethers, alcohols, lactones, organophosphorus compounds, and organosilicon compounds.

[0066] Preferably, the external electron donor is selected from those containing at least one Si-OR. 19 The key and the general formula is (R) 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, wherein R 17 R 18 and R 19 For C1-C 18 The hydrocarbon group, optionally containing heteroatoms, has x and y as independent integers from 0 to 2, z as integers from 1 to 3, and the sum of x, y, and z is 4. R 17 R 18 Preferably C3-C 10 Alkyl or cycloalkyl groups, optionally containing heteroatoms; R 19 Preferably C1-C 10 Alkyl groups, optionally containing heteroatoms.

[0067] Specifically, the external electron donor may be selected from at least one of cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane, and (1,1,1-trifluoro-2-propyl)-methyldimethoxysilane.

[0068] According to the present invention, the amount of the external electron donor can be a conventional amount in the art. The molar ratio of the external electron donor to aluminum in the alkylaluminum compound can be 1:1-300, preferably 1:2-100.

[0069] A fourth aspect of the invention provides the application of the catalyst described above for olefin polymerization in olefin polymerization reactions.

[0070] When the catalyst of the present invention is used in an olefin polymerization reaction, the catalyst components, alkylaluminum compounds, and optional external electron donors can be added to the polymerization reactor separately, or they can be mixed and then added to the polymerization reactor. Alternatively, the olefins can be prepolymerized using a prepolymerization method known in the industry before being added to the polymerization reactor.

[0071] In this invention, the specific type of olefin, the polymerization reaction method and conditions of the olefin can all be conventionally selected based on existing technology.

[0072] The catalyst of the present invention is particularly suitable for the general formula CH2=CHR 1 The homopolymerization and copolymerization reactions of olefins, wherein R 1 It is hydrogen, C1-C6 alkyl or C6-C 12 Aryl groups.

[0073] According to the present invention, the polymerization reaction of the olefin can be carried out according to existing methods, specifically, under the protection of an inert gas, in a liquid monomer or an inert solvent containing the monomer, or in the gas phase, or through a combined gas-liquid phase polymerization process. The polymerization temperature is generally 0-150°C, preferably 60-90°C. The polymerization pressure can be atmospheric pressure or higher, for example 0.01-10 MPa, preferably 0.01-5 MPa, more preferably 0.1-4 MPa; all pressures in this invention refer to gauge pressure. During the polymerization process, hydrogen can be added to the reaction system as a polymer molecular weight regulator to adjust the polymer's molecular weight and melt index. Furthermore, the types and amounts of the inert gas and solvent used in the olefin polymerization reaction are well known to those skilled in the art and will not be described further here.

[0074] Parameters not specified in this invention are all conventional techniques in the field.

[0075] The present invention will be further described below with reference to the embodiments, but the scope of the present invention is not limited to these embodiments.

[0076] In this invention, the polymer isotactic index is determined by the heptane extraction method (boiling heptane extraction for 6 hours). Specifically, 2g of dried polymer sample is placed in an extractor and extracted with boiling heptane for 6 hours. Afterward, the residue is dried to constant weight, and the ratio of the obtained polymer weight (g) to 2 is the isotactic index.

[0077] Examples 1-18 illustrate the catalyst components, catalysts, and applications of the present invention for olefin polymerization.

[0078] Example 1

[0079] (1) Preparation of catalyst components

[0080] In a 300 mL glass reaction flask, 80 mL of titanium tetrachloride was added and cooled to -20 °C. 38 mmol of magnesium halide support (prepared according to the method disclosed in Example 1 of CN1267508C) was added, and the temperature was raised to 115 °C. During the heating process, 1.2 mmol of 4-tert-butoxy-4-oxobutyric acid, 1 mmol of 2,4-pentanediol dibenzoate, and 6.5 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added. After maintaining the temperature at 115 °C for 30 min, the liquid was filtered off, washed with titanium tetrachloride, then washed with hexane, and dried under vacuum to obtain the catalyst component Cat-1 for olefin polymerization.

[0081] (2) Propylene liquid-phase bulk polymerization

[0082] Propylene liquid-phase bulk polymerization was carried out in a 5L stainless steel autoclave. Under nitrogen protection, 2 mL of a triethylaluminum solution in hexane (0.5 mmol / mL), 0.4 mL of a cyclohexylmethyldimethoxysilane (CHMMS) solution in hexane (0.1 mmol / mL), and 9.6 mg of the above-mentioned catalyst component Cat-1 for olefin polymerization were added sequentially. The autoclave was then closed, and 2.3 L of liquid propylene was added. The temperature was raised to 70°C, and the reaction was carried out for 1 hour. Afterward, the temperature was lowered, the pressure was released, and the product was discharged. The resulting propylene homopolymer was dried, weighed, and analyzed. The isotactic index of the obtained polymer was 99.3%.

[0083] Example 2

[0084] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that 1.5 NL of hydrogen was added after the autoclave was shut down.

[0085] Example 3

[0086] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 2, except that the reaction time was 2 hours.

[0087] Example 4

[0088] The catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that 2.6 mmol of 4-tert-butoxy-4-oxobutyric acid, 1.5 mmol of 2,4-pentanediol dibenzoate, and 6.2 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added during the heating process to obtain the catalyst component Cat-2 for olefin polymerization. The isotactic index of the resulting polymer was 99.6%.

[0089] Example 5

[0090] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 4, except that 1.5 NL of hydrogen was added after the autoclave was closed.

[0091] Example 6

[0092] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 5, except that the reaction time was 2 hours.

[0093] Example 7

[0094] The catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that 3.5 mmol of 4-tert-butoxy-4-oxobutyric acid, 2.5 mmol of 3,5-heptanediol dibenzoate, and 5.8 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added during the heating process to obtain the catalyst component Cat-3 for olefin polymerization. The isotactic index of the obtained polymer was 99.7%.

[0095] Example 8

[0096] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 7, except that 1.5 NL of hydrogen was added after the autoclave was shut down.

[0097] Example 9

[0098] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 7, except that the reaction time was 2 hours.

[0099] Example 10

[0100] The catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that 3.9 mmol of 4-tert-butoxy-4-oxobutyric acid, 3.2 mmol of 2,4-pentanediol dibenzoate, and 5.2 mmol of 9,9-dimethoxymethylfluorene were added during the heating process to obtain the catalyst component Cat-4 for olefin polymerization. The isotactic index of the resulting polymer was 99.3%.

[0101] Example 11

[0102] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 10, except that 1.5 NL of hydrogen was added after the autoclave was shut down.

[0103] Example 12

[0104] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 10, except that the reaction time was 2 hours.

[0105] Example 13

[0106] The catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that 4.5 mmol of 4-tert-butoxy-4-oxobutyric acid, 3.9 mmol of 2,4-pentanediol dibenzoate, and 4.3 mmol of 9,9-dimethoxymethylfluorene were added during the heating process to obtain the catalyst component Cat-5 for olefin polymerization. The isotactic index of the resulting polymer was 98.8%.

[0107] Example 14

[0108] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 13, except that 1.5 NL of hydrogen was added after the autoclave was shut down.

[0109] Example 15

[0110] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 13, except that the reaction time was 2 hours.

[0111] Example 16

[0112] The catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that 3 mmol of 2,4-pentanediol dibenzoate, 2 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, and 4 mmol of 4-tert-butoxy-4-oxobutyric acid were added during the preparation of the catalyst component to obtain the catalyst component Cat-6 for olefin polymerization; the obtained propylene homopolymer was dried, weighed, and analyzed. The isotactic index of the obtained polymer was 98.3%.

[0113] Example 17

[0114] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 16, except that 1.5 NL of hydrogen was added after the autoclave was shut down.

[0115] Example 18

[0116] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 16, except that the reaction time was 2 hours.

[0117] Comparative Example 1

[0118] The catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that 4-tert-butoxy-4-oxobutyric acid and 2,4-pentanediol dibenzoate were not added during the preparation of the catalyst component; only 8.7 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was added to obtain the catalyst component DCat-1 for olefin polymerization. The resulting propylene homopolymer was dried, weighed, and analyzed. The isotactic index of the obtained polymer was 97.9%.

[0119] Comparative Example 2

[0120] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Comparative Example 1, except that 1.5 NL of hydrogen was added after the autoclave was closed.

[0121] Comparative Example 3

[0122] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Comparative Example 1, except that the reaction time was 2 hours.

[0123] Comparative Example 4

[0124] The catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that 4-tert-butoxy-4-oxobutyric acid and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were not added during the preparation of the catalyst component; only 8.7 mmol of 2,4-pentanediol dibenzoate was added to obtain the catalyst component DCat-2 for olefin polymerization. The resulting propylene homopolymer was dried, weighed, and analyzed. The isotactic index of the obtained polymer was 97.5%.

[0125] Comparative Example 5

[0126] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Comparative Example 4, except that 1.5 NL of hydrogen was added after the autoclave was closed.

[0127] Comparative Example 6

[0128] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Comparative Example 4, except that the reaction time was 2 hours.

[0129] Comparative Example 7

[0130] 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 and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were not added during the preparation of the catalyst component; only 8.7 mmol of 4-tert-butoxy-4-oxobutyric acid was added to obtain the catalyst component DCat-3 for olefin polymerization. The obtained propylene homopolymer was dried, weighed, and analyzed. The isotactic index of the obtained polymer was 68.1%.

[0131] Comparative Example 8

[0132] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Comparative Example 7, except that 1.5 NL of hydrogen was added after the autoclave was closed.

[0133] Comparative Example 9

[0134] The catalyst components were prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Comparative Example 7, except that the reaction time was 2 hours.

[0135] The test data for the examples and comparative examples are shown in Table 1:

[0136] Table 1

[0137]

[0138]

[0139] As can be seen from the data in the examples and comparative examples, when the internal electron donor contains succinic acid monoester compounds, diol ester compounds and diether compounds, the catalyst simultaneously exhibits high stereodirection and low activity decay rate, and the catalyst composition of the present invention does not contain phthalate compounds (plasticizers).

[0140] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0141] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

Claims

1. A catalyst component for olefin polymerization, characterized in that, The catalyst composition includes the reaction products of the following components: magnesium source, titanium source, and internal electron donor; The internal electron donor is a succinic acid monoester, a diol ester, or a diether; the molar ratio of the succinic acid monoester, diol ester, and diether is 0.1-1.2:0.1-1.0:

1. The succinic acid monoester compound is selected from at least one of the succinic acid monoester compounds shown in formula (1). Equation (1) In equation (1), R1 is C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 alkylaryl or C7-C 20 The aralkyl group, R2 to R5, are each independently selected from hydrogen, C1-C6. 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 alkylaryl or C7-C 20 Aryl groups, the C1-C 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 alkylaryl or C7-C 20 The aralkyl group optionally contains heteroatoms, and R2 to R5 on the same carbon atom are optionally bonded to form a ring; The diol ester compound is selected from at least one of the diol ester compounds shown in formula (2). Equation (2) In equation (2), R1 and R2 may be the same or different, and each is independently C1-C. 10 Straight-chain alkyl, C3-C 10 Branched alkyl groups, C3-C 20 Substituted or unsubstituted cycloalkyl, C6-C 20 Substituted or unsubstituted aryl groups, C7-C 20 Substituted or unsubstituted aralkyl groups and C7-C 20 One of the substituted or unsubstituted alkylaryl groups; the content within square brackets "[]" indicates that there are n carbon atoms linked sequentially, and each carbon atom is also linked to 2 substituents, that is, there are a total of n carbon atoms and R within the square brackets. 1 R 2 R 3 …R 2n There are a total of 2n substituents; R3, R4, R5, R6 and R 1 -R 2n Whether the elements are the same or different, they are independently hydrogen, halogen, or C1-C. 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 Substituted or unsubstituted cycloalkyl, C6-C 20 Substituted or unsubstituted aryl groups, C7-C 20 Substituted or unsubstituted alkylaryl groups, C7-C 20 Substituted or unsubstituted aralkyl, C2-C 10 Straight-chain olefin groups or C3-C 10 Branched olefinic groups, R3, R4, R5, R6 and R 1 -R 2n Optionally containing heteroatoms, said heteroatoms being one or more of nitrogen, oxygen, sulfur, silicon, halogen, and phosphorus; n is an integer from 0 to 10, and when n=0, in the diol ester compound represented by Formula I, the carbon atoms with substituents R3 and R4 are directly bonded to the carbon atoms with substituents R5 and R6. The diether compound is selected from at least one of the diether compounds shown in formula (3): Equation (3) In equation (3), R Ⅰ R Ⅱ R Ⅲ R Ⅳ R Ⅴ and R Ⅵ Whether they are the same or different, they are each independently selected from hydrogen, halogen atoms, and C1-C atoms. 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 Aryl or C7-C 20 alkylaryl, R Ⅰ -R Ⅵ The groups can be bonded together to form a ring; R Ⅶ and R Ⅷ Whether the two are the same or different, they are each independently selected from C1-C. 20 Straight-chain alkyl, C3-C 20 Branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 Aryl, C7-C 20 Alkyl or C7-C 20 Aryl groups; The content of internal electron donors in the catalyst composition is 2-17 parts by weight per part by weight of titanium.

2. The catalyst component for olefin polymerization according to claim 1, wherein, R3, R4, R5, R6 and R 1 -R 2n Whether they are the same or different, each is independently C. 10 -C 20 Fused ring aryl groups, R3, R4, R5, R6 and R 1 -R 2n Optionally containing heteroatoms, said heteroatoms being one or more of nitrogen, oxygen, sulfur, silicon, halogen, and phosphorus; n is an integer from 0 to 10, and when n=0, in the diol ester compound represented by Formula I, the carbon atoms with substituents R3 and R4 are directly bonded to the carbon atoms with substituents R5 and R6.

3. The catalyst component for olefin polymerization according to claim 1, wherein, The succinic acid monoester compound is selected from at least one of 4-methoxy-4-oxobutyric acid, 4-ethoxy-4-oxobutyric acid, 4-propoxy-4-oxobutyric acid, 4-tert-butoxy-4-oxobutyric acid and 4-benzyl-4-oxobutyric acid.

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

5. The catalyst component for olefin polymerization according to claim 1, wherein, In formula (2), the aromatic ring in the aryl, aralkyl or alkylaryl group is optionally substituted by one or more of the following: halogen, straight-chain or branched alkyl group of C1-C6 and alkoxy group of C1-C6.

6. The catalyst component for olefin polymerization according to claim 1, wherein, R3, R4, R5, R6 and R 1 -R 2n Two or more elements are bonded together to form saturated or unsaturated rings.

7. The catalyst component for olefin polymerization according to claim 1, wherein, The diol ester compounds are selected from 1,3-propanediol dibenzoate, 2-methyl-1,3-propanediol dibenzoate, 2-ethyl-1,3-propanediol dibenzoate, 2-propyl-1,3-propanediol dibenzoate, 2-butyl-1,3-propanediol dibenzoate, 2,2-dimethyl-1,3-propanediol dibenzoate, 2-ethyl-2-butyl-1,3-propanediol dibenzoate, 2,2-diethyl-1,3-propanediol dibenzoate, 2-methyl-2-propyl-1,3-propanediol dibenzoate, 2-isopropyl-2-isopentyl-1,3-propanediol dibenzoate, 2,4-pentanediol dibenzoate, 3-methyl-2,4-pentanediol dibenzoate, and 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 Benzoate, 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 Benzoic acid esters, 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 benzoate, 5-Butyl-6-heptene-2,4-heptanediol benzoate, 6-Butyl-6-heptene-2,4-heptanediol benzoate, 3,5-Dimethyl-6-heptene-2,4-heptanediol benzoate, 3,5-Diethyl-6-heptene-2,4-heptanediol benzoate, 3,5-Dipropyl-6-heptene-2,4-heptanediol benzoate, 3,5-Dibutyl-6-heptene-2,4-heptanediol benzoate, 3,3-Dimethyl-6-heptene-2,4-heptanediol benzoate, 3,3-Diethyl-6-heptene-2,4-heptanediol benzoate, 3,3-Dipropyl-6-heptene-2,4-heptanediol benzoate, 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 Formate, 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, 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 the following: 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.

8. The catalyst component for olefin polymerization according to claim 1, wherein, The diol ester compounds are 2,4-pentanediol dibenzoate and / or 3,5-heptanediol dibenzoate.

9. The catalyst component for olefin polymerization according to claim 1, wherein, The diether compounds are selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2-phenylethyl)-1,3-dimethoxypropane, 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(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 the following: alkyl, 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.

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

11. The catalyst component for olefin polymerization according to claim 1, wherein, The molar ratio of succinic acid monoesters, diol esters, and diethers is 0.15-0.75:0.12-0.65:

1.

12. The catalyst component for olefin polymerization according to claim 1, wherein, The magnesium source is at least one selected from magnesium halide, magnesium alkoxide, magnesium haloalkoxide, and magnesium halide adduct support; the titanium source is of the general formula Ti(OR′). 3-a Z a And Ti(OR′) 4-b Z b At least one of the compounds shown, wherein R′ is C1-C 20 Alkyl group, Z is halogen, a is an integer from 1 to 3, and b is an integer from 1 to 4.

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

14. The catalyst component for olefin polymerization according to claim 13, wherein, R′ is a C1-C6 alkyl group.

15. The catalyst component for olefin polymerization according to claim 14, wherein, The titanium source is at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tributoxychloride, titanium dibutoxychloride, titanium butoxytrichloride, titanium triethoxychloride, titanium diethoxychloride, titanium triethoxychloride, and titanium trichloride.

16. The catalyst component for olefin polymerization according to claim 1, wherein, The catalyst composition contains 2-16 parts by weight of magnesium per part by weight of titanium, and 3-15 parts by weight of internal electron donor.

17. The catalyst component for olefin polymerization according to claim 16, wherein, The catalyst composition contains 3-15 parts by weight of magnesium per part by weight of titanium, and 4-13 parts by weight of internal electron donor.

18. The catalyst component for olefin polymerization according to claim 17, wherein, The catalyst composition contains 4-13 parts by weight of magnesium per part by weight of titanium.

19. A method for preparing the catalyst component for olefin polymerization according to any one of claims 1-18, characterized in that, Includes the following steps: A magnesium source and a titanium source are brought into contact and reacted. An internal electron donor is added before, during, and after the contact and reaction of the magnesium source and the titanium source. The mixture is then treated once or multiple times with a titanium source and washed with an inert solvent to obtain the catalyst component.

20. The preparation method according to claim 19, wherein, The molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor is 1:12-200:0.1-1.

5.

21. The preparation method according to claim 20, wherein, The molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor is 1:15-180:0.15-1.

2.

22. A catalyst for olefin polymerization, characterized in that, The catalyst comprises the following reaction products: (i) the catalyst component according to any one of claims 1-18; (ii) at least one alkylaluminum compound; and (iii) An optional external electron donor.

23. The catalyst for olefin polymerization according to claim 22, wherein, The alkylaluminum compound is selected from AlR. n X 3-n At least one of the compounds shown, wherein R is a C1-C8 alkyl group, the hydrogen on the alkyl group is optionally replaced by a halogen atom, X is a halogen, and n is 1, 2 or 3.

24. The catalyst for olefin polymerization according to claim 23, wherein, The alkylaluminum compound is selected from at least one of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, di-n-hexylaluminum chloride, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, and di-n-hexylaluminum chloride.

25. The catalyst for olefin polymerization according to claim 22, wherein, The external electron donor is selected from at least one of carboxylic acids, carboxylic anhydrides, carboxylic esters, ketones, ethers, alcohols, organophosphorus compounds, and organosilicon compounds.

26. The catalyst for olefin polymerization according to claim 25, wherein, The external electron donor is selected from those containing at least one Si-OR 19 The key and the general formula is (R) 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, wherein R 17 R 18 and R 19 For C1-C 18 The hydrocarbon group, optionally containing heteroatoms, x and y are each independent integers from 0 to 2, z is an integer from 1 to 3, and the sum of x, y, and z is 4.

27. The catalyst for olefin polymerization according to claim 26, wherein, R 17 R 18 For C3-C 10 Alkyl or cycloalkyl groups, optionally containing heteroatoms.

28. The catalyst for olefin polymerization according to claim 26, wherein, R 19 For C1-C 10 Alkyl groups, optionally containing heteroatoms.

29. The catalyst for olefin polymerization according to claim 26, 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.

30. The catalyst for olefin polymerization according to claim 22, wherein, The molar ratio of the catalyst component (calculated as titanium) to the alkylaluminum compound (calculated as aluminum) is 1:1-2000; the molar ratio of the external electron donor to the alkylaluminum compound (calculated as aluminum) is 1:1-300.

31. The catalyst for olefin polymerization according to claim 30, wherein, The molar ratio of the catalyst component (calculated as titanium) to the alkylaluminum compound (calculated as aluminum) is 1:20-500.

32. The catalyst for olefin polymerization according to claim 31, wherein, The molar ratio of the catalyst component (calculated as titanium) to the alkylaluminum compound (calculated as aluminum) is 1:30-300.

33. The catalyst for olefin polymerization according to claim 30, wherein, The molar ratio of the external electron donor to the alkylaluminum compound (calculated as aluminum) is 1:2-100.

34. The use of the catalyst for olefin polymerization according to any one of claims 22-33 in olefin polymerization reactions.

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