An olefin polymerization catalyst component, an olefin polymerization catalyst, and use thereof

Abstract

The application discloses an olefin polymerization catalyst component, an olefin polymerization catalyst and application thereof, and the olefin polymerization catalyst component comprises Mg, Ti, halogen, at least one internal electron donor a compound and at least one internal electron donor b compound, wherein the internal electron donor a compound is selected from 2,6-dimethoxy substituent-4-pyrone compounds in a general formula (I), and the internal electron donor b compound is selected from Lewis base compounds; the olefin polymerization catalyst comprising the catalyst component can prepare high-melt-flow-rate polyolefins.

Description

TECHNICAL FIELD

[0001] The present application relates to a catalyst component for the polymerization of olefins, a catalyst comprising the solid catalyst component and the use of the catalyst in the polymerization of olefins, in particular in the polymerization of propylene. BACKGROUND

[0002] Polyolefins are the largest volume and most widely used polymer materials due to their abundant raw materials, low price, easy processing, excellent comprehensive performance and other characteristics. At present, Ziegler-Natta catalyst (Z-N catalyst) still occupies a dominant position in the production of polyolefins. Most of the development of Z-N catalyst focuses on the development of high activity and high stereospecific catalyst and the improvement of the copolymerization ability of the catalyst. Moreover, due to the high catalytic efficiency of the traditional Z-N catalyst (a transition metal compound such as titanium chemically bonded to a magnesium-containing carrier), the comprehensive performance of the produced polymer is good, and the cost is low. At present, most of the catalysts for producing polyolefins in the world are still based on the Z-N catalyst system, which is characterized by high activity, high stereoregularity, long life and product structure customization. From the development process of Z-N catalyst, it can be seen that as early as the first generation of catalyst appeared, it was found that the addition of the third component (mostly electron donors, also known as Lewis bases, among which, the addition in the catalyst preparation process is called internal electron donor, and the addition in the polymerization process is called external electron donor) can greatly affect the behavior of olefin polymerization and the properties of the polymer. Changing the internal electron donor in the catalyst can change the properties of the active center of the catalyst to the greatest extent, thereby changing the performance of the catalyst to the greatest extent. Therefore, the development of new electron donors has always been a hot spot in the research and development of polyolefin catalysts.

[0003] The high-performance internal electron donor compounds with special features in the prior art mainly include: 1) fatty acid ester and aromatic acid ester compounds, mainly represented by phthalic acid ester compounds; 2) diether compounds (for example, EP0361493, EP0728724); 3) succinic acid ester compounds (for example, WO9856834, WO0063261, WO03022894); 4) diol ester compounds (for example, WO9856834, WO0063261, WO03022894); 5) other functional group compounds (CN1105671, CN1242780, US20060128558) and the like. However, in actual application, the above-mentioned compounds as internal electron donors of olefin polymerization catalysts all have certain problems. Although the catalysts using 1,3-diether compounds as internal electron donors have higher activity and good hydrogen regulation sensitivity, the relative molecular mass distribution of the prepared PP is narrow, which is not conducive to the development of different grades of PP; the succinic acid ester compounds as internal electron donors have the advantages that the relative molecular mass distribution of the synthesized PP is wide, and the disadvantages that the stereoregularity of the PP and the hydrogen regulation sensitivity of the catalyst need to be improved; and the activity of the diol ester catalyst system as a whole is not as ideal as the diether system.

[0004] Polypropylene with high melt flow rate has better processing performance, can be made into short fibers, filaments, non-woven fabrics and the like, is widely used in packaging, geotechnical engineering, building materials, clothing, medical and health products and injection molding and many other fields, and has great development potential. Due to the limited hydrogen regulation capacity of the commonly used catalyst system in industrial production, high melt flow rate polypropylene is mainly produced by adding peroxide. However, the melt flow rate stability of the high melt flow rate polypropylene produced by using peroxide degradation method is poor, the yellow index is high, and the odor is large, which limits the application range. The use of catalysts with high hydrogen regulation sensitivity can realize the direct preparation of high melt flow rate polypropylene by using hydrogen regulation method.

[0005] Preparation of polyolefin catalysts with high activity, high stereoregularity and high hydrogen regulation sensitivity is an important research direction in the industry. SUMMARY

[0006] To solve the problems in the prior art, the present application provides an olefin polymerization catalyst component, and an olefin polymerization catalyst comprising the catalyst component can prepare high melt flow rate polyolefin.

[0007] The present application aims to provide an olefin polymerization catalyst component.

[0008] Another object of the present application is to provide a preparation method of the olefin polymerization catalyst component.

[0009] Still another object of the present application is to provide an olefin polymerization catalyst.

[0010] It is another object of the present application to provide the use of the catalyst in the polymerization of olefins.

[0011] In order to achieve the objects of the present application, the present application provides an olefin polymerization catalyst component comprising Mg, Ti, halogen, at least one internal donor a compound selected from the group consisting of 2,6-dimethoxy-substituted-4-pyrone compounds of general formula (I) and at least one internal donor b compound selected from the group consisting of Lewis base compounds.

[0012]

[0013] wherein R 1 , R 2 , R 3 and R 4 are the same or different, each independently selected from the group consisting of H, halogen, C1-C 20 hydrocarbon groups, R 1 and R 2 are not carbonyl groups when attached to the O atoms in the 2,6-dimethoxy groups; preferably, R 1 , R 2 , R 3 and R 4 may also each contain at least one heteroatom selected from the group consisting of N, O, S, P, Si and halogen; preferably, two or more of R 1 , R 2 , R 3 and R 4 may be bonded to each other to form a ring.

[0014] Preferably, R 1 , R 2 , R 3 and R 4 are the same or different, each independently selected from the group consisting of H, halogen, the following substituents of up to 20 carbon atoms: straight-chain or branched alkyl, cycloalkyl, alkenyl, ester, phenyl, alkylphenyl, phenylalkyl, indenyl, benzyl, halogenated or N, O, S, P, Si heteroatom-substituted alkyl, cycloalkyl, phenyl, alkylphenyl, phenylalkyl, indenyl, benzyl; or each independently selected from the group consisting of heterocyclic aryl substituents.

[0015] Preferably, R 1 , R 2 , R 3 and R 4 are the same or different, each independently selected from the group consisting of H, halogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, n-pentyl, isopentyl, cyclopentyl, n-hexyl, cyclohexyl, heptyl, octyl, nonyl, decyl, C11 ~ C 20 linear or branched alkyl, the following substituents of up to 20 carbon atoms: alkenyl, phenyl, m-chlorophenyl, p-chlorophenyl, o-chlorophenyl, m-methoxyphenyl, p-methoxyphenyl, o-methoxyphenyl, p-methylphenyl, p-nitrophenyl, m-nitrophenyl, substituted benzyl, substituted phenethyl, furanyl, pyrrolyl, thienyl, propenyl, butenyl, pentenyl, hexenyl, indenyl.

[0016] Preferably, the 2,6-dimethoxy-substituted-4-pyrone compound of general formula (I) is selected from at least one of 2,6-dimethoxymethyl-4-pyrone, 2,6-dimethoxyethyl-4-pyrone, 2,6-dimethoxypropyl-4-pyrone, 2,6-dimethoxybutyl-4-pyrone, 2,6-dimethoxypentyl-4-pyrone, 2,6-dimethoxyhexyl-4-pyrone, 2,6-dimethoxyheptyl-4-pyrone, 2,6-dimethyloctyl-4-pyrone, 2,6-dimethoxydodecyl-4-pyrone, 2,6-dimethoxytetradecyl-4-pyrone, 2,6-dimethoxyhexadecyl-4-pyrone, 2,6-dimethoxyphenyl-4-pyrone, 2,6-dimethoxybenzyl-4-pyrone, 2,6-dimethoxy-m-chlorophenyl-4-pyrone, 2,6-dimethoxy-o-chlorophenyl-4-pyrone, 2,6-dimethoxy-p-chlorophenyl-4-pyrone, 2,6-dimethoxy-p-methylphenyl-4-pyrone, 2,6-dimethoxy-p-methoxymethyl-4-pyrone, 2,6-dimethoxyfuranyl-4-pyrone, 2,6-dimethoxypropenyl-4-pyrone, 2,6-dimethoxymethyl-3,5-dimethyl-4-pyrone, 2,6-dimethoxymethyl-3-methyl-5-ethyl-4-pyrone, 2,6-dimethoxymethyl-3,5-diethyl-4-pyrone, 2,6-dimethoxymethyl-3,5-dibutyl-4-pyrone, 2,6-dimethoxymethyl-3-ethyl-5-butyl-4-pyrone, 2,6-dimethoxymethyl-3-methyl-5-butyl-4-pyrone.

[0017] Preferably, the 2,6-dimethoxy-substituted-4-pyrone compound of general formula (I) can be synthesized by a preparation method including, but not limited to, the following:

[0018]

[0019] R 1 and R 2 are the same or different, R 3 and R 4 are the same or different, one of the synthesis routes of the 2,6-dimethoxy-substituted-4-pyrone compound of general formula (I) is as follows:

[0020]

[0021] The synthetic route specifically comprises the following steps: oxalic diethyl ester reacts with corresponding ketone and then is reduced to obtain substituted 2,6-dimethanol-4-pyrone compound, which then reacts with an alcohol to obtain pure (substituted) 2,6-dimethoxy substituent-4-pyrone compound, or reacts with a mixture of two alcohols to obtain a mixture of three (substituted) 2,6-dimethoxy substituent-4-pyrone compounds, which is directly applied as an internal electron donor without separation, and the proportion of each component in the mixture can be adjusted by the addition proportion of the two acyl chlorides of the reactants, and the proportion of each component can be determined by chromatography-mass spectrometry and other analytical means.

[0022] Preferably, the molar ratio of the internal electron donor a compound to the internal electron donor b compound is greater than or equal to 2:8.

[0023] Preferably, the molar ratio of the internal electron donor a compound to the internal electron donor b compound is greater than or equal to 3:7.

[0024] Preferably, the molar ratio of the internal electron donor a compound to the internal electron donor b compound is greater than or equal to 5:5.

[0025] Preferably, the molar ratio of the internal electron donor a compound to the internal electron donor b compound is greater than or equal to 7:3.

[0026] Preferably, the molar ratio of the internal electron donor a compound to the internal electron donor b compound is 7:3.

[0027] Preferably, the Lewis base compound contains one or more electronegative groups, in which the electron-donating atom is selected from N, O, S, P, As or Sn.

[0028] Preferably, the Lewis base compound is selected from diether, ester, diketone, diamine, monobasic carboxylic acid ester and polybasic carboxylic acid ester electron donor compounds. When the 2,6-dimethoxy substituent-4-pyrone compound of general formula (I) and the Lewis base compound are used together, a catalyst with adjustable performance can be obtained, and in particular the activity of the catalyst is significantly improved.

[0029] Preferably, the Lewis base compound is selected from 1,3-diether compounds represented by general formula (II):

[0030]

[0031] In general formula (II), R 7 -R 12identically or differently, are each independently selected from H, or are each independently selected from linear or branched alkyl groups containing 1 to 18 carbon atoms, cycloalkyl groups, aryl groups, alkylaryl groups or arylalkyl groups; R 13 and R 14 identically or differently, are each independently selected from linear or branched alkyl groups of 1 to 20 carbon atoms, cycloalkyl groups of 3 to 20 carbon atoms, aryl groups of 5 to 20 carbon atoms, alkylaryl groups and arylalkyl groups of 7 to 20 carbon atoms; R 7 -R 14 One or more of the radicals in -R

[0032] Specifically, the 1,3-diether compound includes, but is not limited to, selected from the group consisting of 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-tert-butyl-1,3-dimethoxypropane, 2-cumyl-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(1-naphthyl)-1,3-dimethoxypropane, 2(p-fluorophenyl)-1,3-dimethoxypropane, 2(1-decahydronaphthyl)-1,3-dimethoxypropane, 2(p-tert-butylphenyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-diethoxypropane, 2,2-dicyclopentyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-diethoxypropane, 2,2-dibutyl-1,3-diethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2-methyl-2-methylcyclohexyl-1,3-dimethoxypropane, 2,2-bis(p-chlorophenyl)-1,3-dimethoxypropane, 2,2-bis(2-phenylethyl)-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-bis(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-bis(p-methylphenyl)-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2-isopropyl-2-cyclopentyl-1,3-dimethoxypropane, 2,2-biscyclohexylmethyl-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-diethoxypropane, 2,2-diisobutyl-1,3-dibutoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2,2-di-sec-butyl-1,3-dimethoxypropane, 2,2-di-tert-butyl-1,3-dimethoxypropane, 2,2-dineopentyl-1,3-dimethoxypropane, 2-iso-propyl-2-iso-pentyl-1,3-dimethoxypropane, 2-phenyl-2-benzyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane. 1,1-bis(methoxymethyl)-cyclopentadiene; 1,1-bis(methoxymethyl)-2,3,4,5-tetramethylcyclopentadiene; 1,1-bis(methoxymethyl)-2,3,4,5-tetraphenylcyclopentadiene; 1,1-bis(methoxymethyl)-2,3,4,5-tetrafluorocyclopentadiene; 1,1-bis(methoxymethyl)-3,4-dicyclopentylcyclopentadiene; 1,1-bis(methoxymethyl)indene; 1,1-bis(methoxymethyl)-2,3-dimethylindene; 1,1-bis(methoxymethyl)-4,5,6,7-tetrahydroindene; 1,1-bis(methoxymethyl)-2,3,6,7-tetrafluoroindene; 1,1-bis(methoxymethyl)-4,7-dimethylindene; 1,1-bis(methoxymethyl)-3,6-dimethylindene; 1,1-bis(methoxymethyl)-4-phenylindene; 1,1-bis(methoxymethyl)-4-phenyl-2-methylindene; 1,1-bis(methoxymethyl)-4-cyclohexylindene; 1,1-bis(methoxymethyl)-7-(3,3,3-trifluoropropyl)indene; 1,1-bis(methoxymethyl)-7-trimethylsilylindene; 1,1-bis(methoxymethyl)-7-trifluoromethylindene; 1,1-bis(methoxymethyl)-4,7-dimethyl-4,5,6,7-tetrahydroindene; 1,1-bis(methoxymethyl)-7-methylindene; 1,1-bis(methoxymethyl)-7-cyclopentylindene; 1,1-bis(methoxymethyl)-7-iso-propylindene; 1,1-bis(methoxymethyl)-7-cyclohexylindene; 1,1-bis(methoxymethyl)-7-tert-butylindene; 1,1-bis(methoxymethyl)-7-tert-butyl-2-methylindene; 1,1-bis(methoxymethyl)-7-phenylindene; 1,1-bis(methoxymethyl)-2-phenylindene; 1,1-bis(methoxymethyl)-1H-benzo[e]indene; 1,1-bis(methoxymethyl)-1H-2-methylbenzo[e]indene; 9,9-bis(methoxymethyl)fluorene; 9,9-bis(methoxymethyl)-2,3,6,7-tetramethylfluorene; 9,9-bis(methoxymethyl)-2,3,4,5,6,7-hexafluorofluorene; 9,9-bis(methoxymethyl)-2,3-benzofluorene; 9,9-bis(methoxymethyl)-2,3,6,7-dibenzofluorene; 9,9-bis(methoxymethyl)-2,7-diiso-propylfluorene; 9,9-bis(methoxymethyl)-1,8-dichlorofluorene; 9,9-bis(methoxymethyl)-2,7-dicyclopentylfluorene; 9,9-bis(methoxymethyl)-1,8-difluorofluorene; 9,9-bis(methoxymethyl)-1,2,3,4-tetrahydrofluorene; 9,9-bis(methoxymethyl)-1,2,3,4, 5, 6, 7, 8-octahydrofluorene; at least one of 9, 9-bis(methoxymethyl)-4-tert-butylfluorene.

[0033] Preferably, the diether electron donor compound is further selected from the group consisting of diether compounds of general formula (III):

[0034]

[0035] In general formula (III), R 21 -R 28 are the same or different, each independently selected from the group consisting of hydrogen, halogen, linear or branched alkyl of 1 to 20 carbon atoms, cycloalkyl of 3 to 20 carbon atoms, aryl of 6 to 20 carbon atoms, alkylaryl of 7 to 20 carbon atoms and arylalkyl of 7 to 20 carbon atoms, optionally containing at least one heteroatom selected from the group consisting of N, O, S, P, Si and halogen as substituents for carbon atoms or hydrogen atoms or both; R 15 -R 18 are the same or different, each independently selected from the group consisting of H, or each independently selected from the group consisting of linear or branched alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl containing 1 to 18 carbon atoms; R 19 and R 20 are the same or different, each independently selected from the group consisting of linear or branched alkyl of 1 to 20 carbon atoms, cycloalkyl of 3 to 20 carbon atoms, aryl of 5 to 20 carbon atoms, alkylaryl and arylalkyl of 7 to 20 carbon atoms; R 15 -R 28 one or more groups in R

[0036] Preferably, the diether compound includes, but is not limited to, selected from the group consisting of 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-tert-butyl-1,3-dimethoxypropane, 2-cumyl-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(1-naphthyl)-1,3-dimethoxypropane, 2(p-fluorophenyl)-1,3-dimethoxypropane, 2(1-decahydronaphthyl)-1,3-dimethoxypropane, 2(p-tert-butylphenyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-diethoxypropane, 2,2-dicyclopentyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-diethoxypropane, 2,2-dibutyl-1,3-diethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2-methyl-2-methylcyclohexyl-1,3-dimethoxypropane, 2,2-bis(p-chlorophenyl)-1,3-dimethoxypropane, 2,2-bis(2-phenylethyl)-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-bis(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-bis(p-methylphenyl)-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2-isopropyl-2-cyclopentyl-1,3-dimethoxypropane, 2,2-biscyclohexylmethyl-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-diethoxypropane, 2,2-diisobutyl-1,3-dibutoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2,2-Di-sec-butyl-1,3-dimethoxypropane, 2,2-di-tert-butyl-1,3-dimethoxypropane, 2,2-dineopentyl-1,3-dimethoxypropane, 2-iso-propyl-2-isopentyl-1,3-dimethoxypropane, 2-phenyl-2-benzyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane, 1,1-bis(methoxymethyl)-cyclopentadiene; 1,1-bis(methoxymethyl)-2,3,4,5-tetramethylcyclopentadiene; 1,1-bis(methoxymethyl)-2,3,4,5-tetraphenylcyclopentadiene; 1,1-bis(methoxymethyl)-2,3,4,5-tetrafluorocyclopentadiene; 1,1-bis(methoxymethyl)-3 4-Dicyclopentylcyclopentadiene; 1,1-bis(methoxymethyl)indene; 1,1-bis(methoxymethyl)-2,3-dimethylindene; 1,1-bis(methoxymethyl)-4,5,6,7-tetrahydroindene; 1,1-bis(methoxymethyl)-2,3,6,7-tetrafluoroindene; 1,1-bis(methoxymethyl)-4,7-dimethylindene; 1,1-bis(methoxymethyl)-3,6-dimethylindene; 1,1-bis(methoxymethyl)-4-phenylindene; 1,1-bis(methoxymethyl)-4-phenyl-2-methylindene; 1,1-bis(methoxymethyl)-4-cyclohexylindene; 1,1-bis(methoxymethyl)-7-(3,3,3-trifluoropropyl)indene; 1,1-bis(methoxymethyl)-7- Trimethylsilyl indene; 1,1-bis(methoxymethyl)-7-trifluoromethyl indene; 1,1-bis(methoxymethyl)-4,7-dimethyl-4,5,6,7-tetrahydro indene; 1,1-bis(methoxymethyl)-7-methyl indene; 1,1-bis(methoxymethyl)-7-cyclopentyl indene; 1,1-bis(methoxymethyl)-7-isopropyl indene; 1,1-bis(methoxymethyl)-7-cyclohexyl indene; 1,1-bis(methoxymethyl)-7-tert-butyl indene; 1,1-bis(methoxymethyl)-7-tert-butyl-2-methyl indene; 1,1-bis(methoxymethyl)-7-phenyl indene; 1,1-bis(methoxymethyl)-2-phenyl indene; 1,1-bis(methoxymethyl)-1H-benzo[e]indene; 1 1-Bis(methoxymethyl)-1H-2-methylbenzo[e]indene; 9,9-bis(methoxymethyl)fluorene; 9,9-bis(methoxymethyl)-2,3,6,7-tetramethylfluorene; 9,9-bis(methoxymethyl)-2,3,4,5,6,7-hexafluorofluorene; 9,9-bis(methoxymethyl)-2,3-benzofluorene; 9,9-bis(methoxymethyl)-2,3-benzofluorene 9,9-bis(methoxymethyl)-2,3,6,7-dibenzo[a]fluorene; 9,9-bis(methoxymethyl)-2,7-diisopropylfluorene; 9,9-bis(methoxymethyl)-1,8-dichlorofluorene; 9,9-bis(methoxymethyl)-2,7-dicyclopentylfluorene; 9,9-bis(methoxymethyl)-1,8-difluorofluorene; 9,9-bis(methoxymethyl)-1,2,3,4-tetrahydrofluorene; 9,9-bis(methoxymethyl)-l,2,3,4,5,6,7,8-octahydrofluorene; at least one of 9,9-bis(methoxymethyl)-4-tert-butylfluorene.

[0037] Preferably, the polycarboxylic acid ester compound is an aromatic dicarboxylic acid compound or a fatty chain dicarboxylic acid ester compound.

[0038] The aromatic dicarboxylic acid compound can be a diester compound of aromatic dicarboxylic acid, such as phthalic acid diester or terephthalic acid diester, wherein the phthalic acid diester can include, but is not limited to, dimethyl phthalate, diethyl phthalate, di-n-propyl phthalate, di-isopropyl phthalate, dibutyl phthalate, di-n-butyl phthalate, di-isobutyl phthalate, methyl ethyl phthalate, methyl isopropyl phthalate, methyl n-propyl phthalate, ethyl n-butyl phthalate, ethyl isobutyl phthalate, di-n-amyl phthalate, di-isamyl phthalate, dihexyl phthalate, di-n-heptyl phthalate, di-n-octyl phthalate, di-isooctyl phthalate, (2,2-dimethylhexyl) phthalate, (2-ethylhexyl) phthalate, di-n-nonyl phthalate, di-isodecyl phthalate, (2,2-dimethylheptyl) phthalate, n-butyl isohexyl phthalate, n-butyl (2-ethylhexyl) phthalate, n-amyl n-hexyl phthalate, n-amyl isononyl phthalate, isoamyl n-decyl phthalate, n-amyl undecyl phthalate, isoamyl isohexyl phthalate, n-hexyl (2-methylhexyl) phthalate, n-hexyl (2-ethylhexyl) phthalate, n-hexyl (isononyl) phthalate, n-hexyl (n-decyl) phthalate, n-heptyl (2-ethylhexyl) phthalate, n-heptyl (isononyl) phthalate, n-heptyl neononyl phthalate, and 2-ethylhexyl (isononyl) phthalate. These esters can be used alone or in a mixture of a plurality.The terephthalic acid diesters include, but are not limited to, at least one of dimethyl terephthalate, diethyl terephthalate, di-n-propyl terephthalate, diisopropyl terephthalate, di-n-butyl terephthalate, diisobutyl terephthalate, ethyl methyl terephthalate, methyl isopropyl terephthalate, ethyl (n-propyl) terephthalate, ethyl (n-butyl) terephthalate, ethyl (isobutyl) terephthalate, di-n-pentyl terephthalate, diisopentyl terephthalate, dihexyl terephthalate, di-n-heptyl terephthalate, di-n-octyl terephthalate, diis-n-octyl terephthalate, di(2,2-dimethylhexyl) terephthalate, di(2-ethylhexyl) terephthalate, di-n-nonyl terephthalate, diisnonyl terephthalate, diisodecyl terephthalate, di(2,2-dimethylethylheptyl) terephthalate, n-butyl isohexyl terephthalate, n-butyl (2-ethylhexyl) terephthalate, n-pentyl n-hexyl terephthalate, n-pentyl isohexyl terephthalate, iso-pentyl (heptyl) terephthalate, terephthalic acid, n-pentyl (2-ethylhexyl) terephthalate, n-pentyl (isononyl) terephthalate, iso-pentyl (n-decyl) terephthalate, n-pentyl undecyl terephthalate, iso-pentyl isohexyl terephthalate, n-hexyl (2-ethylhexyl) terephthalate, n-hexyl (isononyl) terephthalate, n-hexyl (n-decyl) terephthalate, n-heptyl (2-ethylhexyl) terephthalate, n-heptyl (isononyl) terephthalate, n-heptyl (neodecyl) terephthalate, and 2-ethylhexyl (isononyl) terephthalate.

[0039] Among the diester compounds of the above aromatic dicarboxylic acids, at least one of diethyl phthalate, di-n-propyl butyl phthalate, diisopropyl terephthalate, di-n-butyl phthalate, diisobutyl phthalate, di-n-octyl phthalate, diis-n-octyl phthalate, di-n-butyl terephthalate, diisobutyl terephthalate, di-n-octyl terephthalate, diis-n-octyl terephthalate, di(2-ethylhexyl) terephthalate, and diisodecyl phthalate is preferably used.

[0040] Preferably, the ester compound of the Lewis base compound is a diol ester compound of general formula (IV):

[0041]

[0042] In general formula (IV), R 29 - R 36 are the same or different, each independently selected from hydrogen, halogen, or a substituted or unsubstituted linear or branched C1-C 20 alkyl, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C20 alkyl, C1-C6 20 aralkyl, C2-C 10 alkenyl, or C 10 -C 20 fused ring aryl; but R 31 and R 32 is not hydrogen, R 29 -R 36 one or more of which are optionally annelated or unannelated.

[0043] Preferably, the diol ester compound includes, but is not limited to, at least one selected from the group consisting of 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-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, 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, 3,5-heptanediol dibenzoate, 4-ethyl-3,5-heptanediol dibenzoate. Pentanediol esters and heptanediol esters are preferred.

[0044] Preferably, the ester compound of the Lewis base compound is an ortho-phenylene diester of general formula (V):

[0045]

[0046] In general formula (V), R 37 and R 38 are the same or different, each independently selected from a substituted or unsubstituted linear or branched C1-C 20 alkyl group, a C3-C 20 cycloalkyl group, a C6-C 20 substituted or unsubstituted aryl group, a C7-C 20 substituted or unsubstituted aralkyl group, a C2-C 10 alkenyl group, a C 10 -C 20 fused ring aryl group, or an ester group, and R 37 and R 38 are not hydrogen; R 39 -R 42 are the same or different, each independently selected from hydrogen, a substituted or unsubstituted C1-C 20 hydrocarbyl group, an alkoxyl group comprising C1-C 20 alkyl groups, a heteroatom, and combinations thereof.

[0047] Preferably, the ester compound of the Lewis base compound is a compound represented by general formula (VI):

[0048]

[0049] In general formula (VI), R 43 -R 56 are the same or different, each independently selected from hydrogen, a substituted hydrocarbyl group comprising 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group comprising 1 to 20 carbon atoms, an alkoxyl group comprising 1 to 20 carbon atoms, a heteroatom, and combinations thereof.

[0050] Preferably, in general formula (VI), at least one of R 43 -R 46 is selected from a substituted hydrocarbyl group comprising 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group comprising 1 to 20 carbon atoms, and combinations thereof.

[0051] Preferably, in general formula (VI), at least one of R 47 -R 56 is selected from a substituted hydrocarbyl group comprising 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group comprising 1 to 20 carbon atoms, an alkoxyl group comprising 1 to 20 carbon atoms, a heteroatom, and combinations thereof.

[0052] Preferably, the compound represented by general formula (VI) includes, but is not limited to, a compound selected from:

[0053] 1,2-Dihydroxybenzene-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0054] 1,2-Dihydroxybenzene-3-methyl-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0055] 1,2-Dihydroxybenzene-3-methoxy-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0056] 1,2-Dihydroxybenzene-3-ethyl-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0057] 1,2-Dihydroxy-3-ethyl-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0058] 1,2-Dihydroxy-3-ethyl-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0059] 1,2-Dihydroxy-3-ethyl-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0060] 1,2-Dihydroxy-3-ethyl-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0061] 1,2-dihydroxybenzene-4-ethyl-1,2-bis[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4- isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4- isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2- chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0062] 1,2-dihydroxybenzene-4-ethyl-1,2-bis[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4- isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4- isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2- chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0063] 1,2-dihydroxybenzene-4-ethyl-1,2-bis[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4- isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4- isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2- chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0064] 1,2-dihydroxybenzene-4-ethyl-1,2-bis[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4- isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4- isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2- chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0065] 1,2-dihydroxy-4-ethyl-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0066] 1,2-dihydroxy-4-formyl-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0067] 1,2-dihydroxy-4-acetyl-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0068] 1,2-dihydroxy-4-hydroxy-1,2-bis[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0069] 1,2-Dihydroxybenzene-4-methyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4- isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4- isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2- chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0070] 1,2-Dihydroxybenzene-4-bromo-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4- isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4- isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2- chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0071] 1,2-Dihydroxybenzene-3,4-dimethyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4- isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4- isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2- chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0072] 1,2-Dihydroxybenzene-3,4-dimethoxy-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4- isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4- isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2- chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0073] 1,2-Dihydroxybenzene-3,5-di-tert-butyl-1,2-di-[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0074] 1,2-Dihydroxybenzene-3-methyl-5-tert-butyl-1,2-di-[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0075] 1,2-Dihydroxybenzene-3,5-di-tert-butyl-1,2-di-[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0076] 1,2-Dihydroxybenzene-3,5-di-tert-butyl-1,2-di-[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0077] 1,2-dihydroxybenzene-3,5-dimethoxy-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0078] 1,2-dihydroxybenzene-3,6-dimethyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0079] 1,2-dihydroxybenzene-3,6-dimethyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0080] 1,2-dihydroxybenzene-3,6-dimethyl-4-isopropyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-t-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0081] 1,2-dihydroxybenzene-3-ethyl-5-tert-butyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n- butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4- fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0082] 1,2-dihydroxybenzene-4-ethyl-5-tert-butyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n- butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4- fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0083] 1,2-dihydroxybenzene-4-ethyl-5-tert-butyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n- butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4- fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0084] 1,2-dihydroxybenzene-3-ethyl-5-tert-butyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n- butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4- fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6- trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0085] 1,2-Dihydroxybenzene-3,4,6-trimethyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0086] 1,2-Dihydroxybenzene-3,4,6-trimethyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate].

[0087] The above compounds are further preferred:

[0088] 1,2-Dihydroxybenzene-3,4,6-trimethyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0089] 1,2-Dihydroxybenzene-3,4,6-trimethyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate].

[0090] 1,2-Dihydroxybenzene-3-ethyl-1,2-di[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0091] 1,2-Dihydroxybenzene-4-methyl-1,2-di[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0092] 1,2-Dihydroxybenzene-4-tert-butyl-1,2-di[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0093] 1,2-Dihydroxybenzene-3-methyl-5-tert-butyl-1,2-di[benzoate, 2-methylbenzoate, 2-isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0094] 1,2-dihydroxybenzene-3,6-di-tert-butyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0095] 1,2-dihydroxybenzene-3,6-di-tert-butyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate];

[0096] 1,2-dihydroxybenzene-3,6-di-tert-butyl-1,2-di[benzoate, 2-methylbenzoate, 2- isopropylbenzoate, 4-methylbenzoate, 4-n-propylbenzoate, 4-isopropylbenzoate, 4-n-butylbenzoate, 4-tert-butylbenzoate, 4-isobutylbenzoate, 4-aminobenzoate, 4-fluorobenzoate, 2-chlorobenzoate, 3-chlorobenzoate, 4-chlorobenzoate, 2,4,6-trimethylbenzoate, 3-methoxybenzoate, 4-methoxybenzoate].

[0097] According to a specific embodiment of the present application, preferably, the composition of the catalyst component comprises a titanium compound, a magnesium compound, the 2,6-dimethoxy-substituted-4-pyrone compound and a Lewis base compound;

[0098] The precursor of the magnesium compound is selected from at least one of X n Mg(OR a ) 2-n , MgCl2.mR a OH, R a 2-n MgX n , MgCl2 / SiO2, MgCl2 / Al2O3, a mixture of magnesium halide and titanium alcoholate, wherein m is 0.1-6, 0≤n≤2, X is halogen, R a is a C1-C 20 hydrocarbon group;

[0099] The general formula of the titanium compound is TiXN (OR b ) 4-N , wherein R b is a C1-C 20 hydrocarbon group, X is halogen, and N is 1-4.

[0100] Preferably, the magnesium compound is an alcoholate of a magnesium dihalide;

[0101] Alternatively, the magnesium compound is a liquid magnesium compound;

[0102] Alternatively, the magnesium compound is a derivative of a magnesium dihalide in which at least one halogen atom in the molecule is replaced by a hydrocarbyloxy group or a halogenated hydrocarbyloxy group; preferably a hydrocarbyloxymagnesium compound; more preferably an alkyloxymagnesium and / or aryloxymagnesium compound.

[0103] Preferably, the titanium alkyl halide comprises at least one of methoxytitanium trichloride, ethoxytitanium trichloride, propoxytitanium trichloride, n-butoxytitanium trichloride, dimethoxytitanium dichloride, diethoxytitanium dichloride, dipropoxytitanium dichloride, di-n-butoxytitanium dichloride, trimethoxytitanium chloride, triethoxytitanium chloride, tripropoxytitanium chloride, and tri-n-butoxytitanium chloride.

[0104] Preferably, the titanium compound is titanium tetrachloride.

[0105] Preferably, the total of the internal electron donor a compound and the internal electron donor b compound is in a molar ratio of 0.01-5.0, preferably 0.05-3.0, to the magnesium compound calculated as magnesium element.

[0106] The present application does not particularly limit the method of preparing the olefin polymerization catalyst component, which can be prepared according to the following methods:

[0107] Method 1: The aromatic hydrocarbon (e.g. toluene, xylene, etc.) solution of a titanium compound (e.g. TiCl4or a titanium alkoxide) is reacted with a magnesium compound (e.g. a dialkoxide or diaryl oxide of magnesium) at -25 to 0°C and halogenated at 80 to 130°C. The treatment with the aromatic hydrocarbon solution of TiCl4may be repeated one or more times. The solid catalyst component is prepared by treating at least one 2,6-dimethoxyl-substituted-4-pyrone compound of general formula (I) and at least one Lewis base compound. For example, the solid catalyst component can be prepared according to the method disclosed in US 5,077,357 A: ethyl magnesium, titanium tetraethoxide, o-cresol, ethanol and chlorobenzene are added in this order and stirred; the TiCl4 / chlorobenzene solution is quickly added to the above liquid, and after complete dissolution, the temperature is raised to 80 to 130°C; after the ethanol reactant is removed by bubbling N2, the stirring is continued for a certain period of time, and then the solid is washed once with hot chlorobenzene and twice with isooctane, and dried with N2. Alternatively, the solid catalyst component can be prepared according to another example: TiCl4, titanium tetraethoxide, ethyl magnesium and o-cresol are added in this order to chlorobenzene, and stirred; ethanol is added, and after the ethyl magnesium is dissolved at high temperature, the stirring is continued for 3 hours; the hot solid is filtered and washed once with warm chlorobenzene and once with isooctane, and finally dried with N2.

[0108] Method 2: The magnesium compound (e.g. alcoholate or chlorohydrate of magnesium) is reacted with excess TiCl4containing at least one 2,6-dimethoxyl-substituted-4-pyrone compound of general formula (I) and at least one Lewis base compound in solution at a temperature of 80 to 135°C. According to a preferred method, the solid catalyst component is prepared by reacting a titanium compound of general formula TiX N (OR b ) 4-N (wherein R b is a C1-C 20 hydrocarbon group, X is halogen, and N is 1 to 4; preferably TiCl4) with an adduct of MgCl2-mR a OH (wherein m is a number of 0.1 to 6, preferably 2 to 4, and R a is a C1-C 20 hydrocarbon group). The adduct can be suitably made spherical by mixing the alcohol and magnesium chloride in the presence of an inert hydrocarbon which is not miscible with the adduct, rapidly quenching the emulsion, and thereby solidifying the adduct in the form of spherical particles. The spherical MgCl2-mR aExamples of OH adducts are described in US4399054A and US4469648A. The adducts thus obtained can be reacted directly with titanium compounds or they can be previously subjected to a thermally controlled dealcoholation (80-130°C) to obtain an adduct in which the number of moles of alcohol is generally lower than 3, preferably between 0.1 and 2.5. The reaction with the titanium compound can be carried out by suspending the adduct (dealcoholated or as such) in cold TiCl4(generally -25-0°C); the mixture is heated to 80-130°C and kept at this temperature for 0.5-2 hours. The treatment with TiCl4can be carried out once or more than once. During the treatment with TiCl4at least one compound of the 2,6-dimethoxysubstituted-4-pyrone of general formula (I) and at least one Lewis base compound can be added, this treatment can be repeated once or more than once.

[0109] Method three: anhydrous magnesium chloride and at least one compound of the 2,6-dimethoxysubstituted-4-pyrone of general formula (I) and at least one Lewis base compound are ground together under conditions such that the magnesium dichloride is activated. The product thus obtained can be treated with an excess of TiCl4at a temperature of 80-130°C, once or more than once. After the treatment the product is washed with a volume of hydrocarbon until it is free of chloride ions. According to a further method, the product obtained by co-grinding anhydrous magnesium dichloride, a titanium compound and at least one compound of the 2,6-dimethoxysubstituted-4-pyrone of general formula (I) and at least one Lewis base compound is treated with a halogenated hydrocarbon such as 1,2-dichloroethane, chlorobenzene, dichloromethane. The treatment is carried out at a temperature between 40°C and the boiling point of the halogenated hydrocarbon for 1-4 hours. The product is then generally washed with an inert hydrocarbon volume such as hexane.

[0110] Method four: the magnesium dichloride can be pre-activated according to known methods and then treated with an excess of TiCl4at a temperature of about 80-135°C in which at least one compound of the 2,6-dimethoxysubstituted-4-pyrone of general formula (I) and at least one Lewis base compound are contained in solution. The treatment with TiCl4is carried out several times and the solid is washed with hexane to remove any unreacted TiCl4.

[0111] Method five: the preparation of the titanium-containing solid catalyst component can also be carried out according to the method disclosed in CN1208045A: a liquid magnesium compound and a liquid titanium compound are brought into contact at a low temperature in the presence of a compound selected from the group consisting of alcohols, phenols, ketones, aldehydes, ethers, amines, pyridines and esters, the temperature of the contact being generally between -70 and 200°C, preferably between -30 and 130°C, the contact being carried out in the presence of at least one compound of the 2,6-dimethoxysubstituted-4-pyrone of general formula (I) and at least one Lewis base compound.

[0112] Method six: a magnesium compound is dissolved in a solvent system consisting of an organic epoxy compound, an organic phosphorus compound and an inert diluent, a homogeneous solution is formed and mixed with a titanium compound, in the presence of a co-precipitant, which is one of an organic acid anhydride, an organic acid, an ether, a ketone, the solid is washed out; the solid is treated with at least one 2,6-dimethoxyl-substituted-4-pyrone compound of the general formula (I) and at least one Lewis base compound to load them on the solid, if necessary, further treated with titanium tetrahalide and an inert diluent to obtain the supported catalyst, wherein the co-precipitant is one of an organic acid anhydride, an organic acid, an ether, a ketone. The components are used in the following molar ratios per mole of magnesium halide: the organic epoxy compound is 0.2-10 moles, the organic phosphorus compound is 0.1-3 moles, the co-precipitant is 0.03-1.0 moles, the halide of transition metal Ti and its derivatives is 0.5-150 moles.

[0113] Method seven: a magnesium compound supported on inorganic oxides such as SiO2, alumina or porous resins is prepared, then activated by known methods, and treated with excess TiCl4 at a temperature of about 80-135°C, and at least one 2,6-dimethoxyl-substituted-4-pyrone compound of the general formula (I) and at least one Lewis base compound are added during the treatment.

[0114] The above-mentioned reactions result in the formation of magnesium halide in an active form (the general crystal magnesium halide structure is regular, and the loadable Ti is little, thus the catalytic activity is low, and in order to prepare a high-activity supported catalyst, the magnesium halide must be treated by activation. The activation treatment method includes the physical and / or chemical method to make it into microcrystal, so that the active center is loaded on the surface, edge and defect of the magnesium halide, and the treated magnesium halide microcrystal suitable for loading Ti is "active magnesium halide"). In addition to these reactions, other methods are known in the literature to form magnesium halide in an active form from starting materials different from magnesium halide.

[0115] In any of the above-mentioned preparation methods, the internal electron donor compound can be added directly in itself or by alternative means, for example by using a suitable precursor to be prepared in situ, which is capable of being converted in the desired internal electron donor compound, for example by means of known chemical reactions such as esterification, transesterification and the like. Generally, the internal electron donor compound is used in a molar ratio of 0.01-5, preferably 0.05-3.0, with respect to MgCl2.

[0116] In any of the above preparation methods, the internal electron donor compound (at least one compound selected from the group consisting of 2,6-dimethoxy-substituted-4-pyrone compounds of general formula (I) and at least one Lewis base compound) can be added in one batch or in several batches, in any order and in any combination, simultaneously or separately during the preparation process.

[0117] The present application also provides an olefin polymerization catalyst comprising the above catalyst component.

[0118] The present application also provides a catalyst for olefin polymerization, the raw material composition of which comprises the above catalyst component and an organic aluminum compound.

[0119] According to a specific embodiment of the present application, preferably, the organic aluminum compound has a general formula of AlR c p X (3-p) wherein R c is hydrogen or a C1-C 20 hydrocarbon group, X is halogen, and p is an integer of 0≤p≤3.

[0120] According to a specific embodiment of the present application, preferably, the organic aluminum compound comprises at least one of a trialkyl aluminum compound, an alkyl aluminum halide, an alkyl aluminum hydride, an alkyl aluminum sesquichloride, and an alkyl aluminum oxide.

[0121] According to a specific embodiment of the present application, preferably, the trialkyl aluminum compound comprises at least one of trimethyl aluminum, triethyl aluminum, triisobutyl aluminum, tri-n-butyl aluminum, tri-n-hexyl aluminum, and trioctyl aluminum; the alkyl aluminum halide comprises AlEt2Cl; and the alkyl aluminum sesquichloride comprises Al2Et3Cl3.

[0122] According to a specific embodiment of the present application, preferably, the molar ratio of the organic aluminum compound to the titanium atom in the catalyst component is 1-1000:1, and more preferably 50-800.

[0123] According to a specific embodiment of the present application, preferably, the raw material composition of the catalyst further comprises an external electron donor.

[0124] According to a specific embodiment of the present application, preferably, the external electron donor is a siloxane compound.

[0125] According to a specific embodiment of the present application, preferably, the siloxane compound has a general formula of R’ t Si(OR”) 4-t wherein R’ and R” are each independently selected from C1-C 18hydrocarbyl group, t is an integer from 0 < t < 3; more preferably, R' and R" each comprise a heteroatom; more preferably, the heteroatom comprises at least one of N, O, S, P, Si.

[0126] According to a particular embodiment of the application, preferably, the siloxane compound comprises trimethylmethoxysilane, trimethylethoxysilane, tri-n-propylmethoxysilane, tri-n-propylethoxysilane, tri-n-butylmethoxysilane, triisobutylethoxysilane, tricyclohexylmethoxysilane, tricyclohexylethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, di-n-propyldimethoxysilane, diisopropyldimethoxysilane, di-n-propyldiethoxysilane, diisopropyldiethoxysilane, di-n-butyldiethoxysilane, diisobutyldiethoxysilane, di-t-butyldimethoxysilane, di-t-butyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, di-t-butyldiethoxysilane, di-n-butyldiethoxysilane, n-butylmethyldimethoxysilane, di(2-ethylhexyl)dimethoxysilane, di(2-ethylhexyl)diethoxysilane, dicyclohexyldimethoxysilane, dicyclohexyldiethoxysilane, dicyclopentyldimethoxysilane, dicyclopentyldiethoxysilane, cyclohexylmethyldimethoxysilane, cyclohexylmethyldiethoxysilane, cyclohexylethyldimethoxysilane, cyclohexylisopropyldimethoxysilane, cyclohexylethyldiethoxysilane, cyclopentylmethyldimethoxysilane, cyclopentylethyldiethoxysilane, cyclopentylisopropyldiethoxysilane, cyclopentylisobutyldimethoxysilane, cyclohexyl-n-propyldimethoxysilane, cyclohexyl-n-propyldiethoxysilane, cyclohexyl-n-butyldiethoxysilane, pentylmethyldimethoxysilane, pentylmethyldiethoxysilane, pentylethyldimethoxysilane, pentylethyldiethoxysilane, cyclohexyldimethylmethoxysilane, cyclohexyldiethylmethoxysilane, cyclohexyldiethylmethoxysilane, cyclohexyldiethyl-ethoxysilane, 2-ethylhexyltrimethoxysilane, cyclohexyldimethoxysilane, cyclohexyldiethoxysilane, 2-ethylhexyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, isopropyltrimethoxysilane, isopropyltriethoxysilane, n-butyltrimethoxysilane, isobutyltrimethoxysilane, t-butyltrimethoxysilane, n-butyltriethoxysilane, cyclohexyltrimethoxysilane, cyclohexyltriethoxysilane, cyclopentyltrimethoxysilane, cyclopentyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 2-ethylhexyltrimethoxysilane, 2-ethylhexyltriethoxysilane, pentyltrimethoxysilane, pentyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, cyclohexylcyclopentyldimethoxysilane, cyclohexylcyclopentyldiethoxysilane, cyclohexylcyclopentyldipropoxysilane, 3-methylcyclohexylcyclopentyldimethoxysilane, 4-methylcyclohexylcyclopentyldimethoxysilane, 3,at least one of 5-dimethylcyclohexylcyclopentyldimethoxysilane, 3- methylcyclohexylcyclohexyldimethoxysilane, di(3-methylcyclohexyl)dimethoxysilane, 4-methylcyclohexylcyclohexyldimethoxysilane, di(4-methylcyclohexyl)dimethoxysilane, 3,5-dimethylcyclohexylcyclohexyldimethoxysilane, di(3,5-dimethylcyclohexyl)dimethoxysilane, tetrapropoxysilane, tetrabutoxysilane,

[0127] More preferably, the siloxane compound comprises at least one of di-n- propyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, di-t-butyldimethoxysilane, di-n-butyldiethoxysilane, t- butyltrimethoxysilane, dicyclohexyldimethoxysilane, dicyclohexyldiethoxysilane, cyclohexylmethyldimethoxysilane, cyclohexylethyldiethoxysilane, cyclohexylethyldimethoxysilane, cyclohexylethyldiethoxysilane, cyclopentylmethyldimethoxysilane, cyclopentylmethyldiethoxysilane, cyclopentylethyldimethoxysilane, cyclohexylcyclopentyldimethoxysilane, cyclohexylcyclopentyldiethoxysilane, 3-methylcyclohexylcyclopentyldimethoxysilane, 4-methylcyclohexylcyclopentyldimethoxysilane, and 3,5-dimethylcyclopentyldimethoxysilane.

[0128] According to a specific embodiment of the present application, preferably, the molar ratio of silicon in the external electron donor to titanium in the catalyst component is 0.002-100, more preferably 0.01-20, and further preferably 0.01-5.

[0129] The present application also provides use of the above-mentioned catalyst in olefin polymerization.

[0130] According to a specific embodiment of the present application, preferably, the olefin comprises at least one of linear or branched olefins, such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 3-methyl-1-butene, 4-methyl-1-pentene, butadiene, vinylcyclopentene, and vinylcyclohexene.

[0131] According to a specific embodiment of the present application, preferably, the polymerization comprises polymerization of ethylene and / or propylene.

[0132] According to a specific embodiment of the present application, preferably, the polymerization comprises homopolymerization or copolymerization.

[0133] According to a specific embodiment of the present application, preferably, in the catalytic process, the order of adding each component in the catalyst is arbitrary, and the organic aluminum compound is first added to the polymerization system, then the external electron donor is added, and finally the catalyst component is added.

[0134] According to the specific embodiments of the present application, preferably, in the above-mentioned applications, the polymerization process can be carried out with or without solvent; the olefin monomer can be in gas phase or liquid phase; more preferably, hydrogen can be further added as a molecular weight regulator (the polymerization can also be carried out without molecular weight regulator); both continuous polymerization or batch polymerization process can be applied, and the polymerization reaction can be carried out in one step, two steps or multiple steps.

[0135] According to the specific embodiments of the present application, preferably, the temperature of the polymerization is ≤200℃, more preferably 20-100℃, and further preferably 40-80℃; the pressure of the polymerization is ≤10MPa, preferably 0.3-5MPa.

[0136] The catalyst component of the present application uses 2,6-dimethoxy-substituted-4-pyrone compound as an internal electron donor, and the activity can be significantly improved after compounding with Lewis base compound. The catalyst can maintain high activity with the increase of polymerization time, and the polyolefin obtained by the catalyst has high isotacticity, and even when no external electron donor is added, high isotactic polyolefin can still be obtained. The obtained catalyst has good hydrogen regulation sensitivity, and is suitable for preparing polyolefin with high melt flow rate. DETAILED DESCRIPTION

[0137] The technical solutions of the present application will be described in detail below in combination with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0138] The operations of preparing the catalyst in the examples are all carried out under the protection of high-purity nitrogen. The isotacticity of the polymer is determined by heptane extraction method (heptane boiling extraction for 6 hours). Two grams of dried polymer sample is placed in an extractor and extracted with boiling heptane for 6 hours, and then the remaining material is dried to constant weight. The ratio of the weight of the obtained polymer (g) to 2 is the isotacticity.

[0139] The bulk density of the polymer is determined by the method of JB / T 2412-2008.

[0140] The determination of the molecular weight distribution of the polymer is carried out by PL-220 gel permeation chromatography with trichlorobenzene as the solvent at 150℃ (standard sample: polystyrene, flow rate 1.0mL / min, column: 3xPlgel 10um M1Xed-B 300x7.5nm).

[0141] Other Lewis base compound sources: 9,9-bis(methoxymethyl)fluorene, commercially available, CAS number 182121-12-6; 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, synthesized according to CN1041752A; di-n-butyl phthalate, commercially available, CAS number 84-74-2; diethyl 2,3-diisopropylsuccinate, synthesized according to CN1313869A; diethyl 2,3-diisopropyl-2-cyanosuccinate, synthesized according to CN106608935A; 2,4-pentanediol dibenzoate, synthesized according to CN1580038; 1,2-dihydroxybenzene-4-tert-butyl-1,2-diacetate, 1,2-dihydroxybenzene-4-tert-butyl-1,2-dihexanoate, 1,2-dihydroxybenzene-1,2-dibenzoate, 1,2-dihydroxybenzene-4-tert-butyl-1,2-dibenzoate, 1,2-dihydroxybenzene-4-tert-butyl-1,2-di(m-chlorobenzoate), synthesized according to CN102325808A; ethyl benzoate, commercially available, CAS number 93-89-0.

[0142] Synthesis of 2,6-dimethoxy-substituted-4-pyrone compounds of general formula (I)

[0143] Preparation 1 : Synthesis of 2,6-dimethoxymethyl-4-pyrone

[0144] Sodium (14.2 g, 0.6 mol) was dissolved in absolute ethanol (200 mL). A mixture of absolute acetone (17.4 g, 22.8 mL, 0.3 mol) and diethyl oxalate (93 g, 86.5 mL, 0.64 mol) was added to the previous solution in 15 minutes. A yellow precipitate was formed. The reaction mixture was kept at 60 °C for one hour. Then, HCI (aq. 37%, 120 mL) and water (60 mL) were added and the solution was stirred at 50 °C for 20 hours. The mixture of water and ethanol was removed under reduced pressure. Then a mixture of water (170 mL) and HCI (aq. 37%, 30 mL) was added to the mixture and stirred until the silica gel TLC (eluent: 3 / 7 (v / v) 10% NaCI aqueous solution / ethanol) showed only one spot. After cooling to room temperature, the crystals were filtered off, first washed with water and then with cold acetone. The crude product was recrystallized to give 4-pyrone-2,6-dicarboxylic acid as a white powder.

[0145] In a 1 L three-necked flask, 4-pyrone-2,6-dicarboxylic acid (6.6 g), ethanol (120 mL), concentrated sulfuric acid (0.72 mL) were added; heated to reflux for 2 hours; cooled to room temperature; the reaction solution was poured into saturated sodium bicarbonate solution, extracted with ethyl acetate twice (120 mL*2), the combined organic phase was washed with saturated brine (120 mL*1), concentrated and recrystallized from 120 mL of anhydrous methanol, then sodium borohydride (3.8 g) was added gradually, cooled to -20 °C in an ice-salt bath, stirred for 1 hour. The solvent was removed, the orange residue was dissolved in water (120 ml), then neutralized with 10% H2SO4 aqueous solution. Evaporated to dryness to obtain orange solid product, which was dissolved in ethanol / ethyl acetate (9:1, 170 ml) and the reaction mixture was filtered. Recrystallized from ethanol / petroleum ether (2:1) to obtain light brown powder 2,6-dimethanol-4-pyrone.

[0146] In a 250 mL three-necked flask, 2,6-dimethanol-4-pyrone (7.8 g, 0.05 mol), toluene (90 ml), tetra-n-butylammonium hydrogen sulfate (0.283 g, 0.8335 mmol), 50% NaOH aqueous solution (45.5 g, 0.57 mol) were added, cooled to 0 °C in an ice-salt bath, dimethyl sulfate / toluene (8.5 g / 20 ml) was added dropwise, the addition took 0.5 h, the temperature was raised to 10 °C, and stirred for 5 h. The temperature was raised to room temperature, and stirred overnight. Water (80 ml) was added, stirred for 20 min, and extracted with dichloromethane. The organic phase was washed with water twice (50 ml*2), the organic phase was filtered, the filtrate was evaporated to dryness, and the solid was obtained by oil pump drying, and recrystallized from ethanol. The NMR data are shown in Table 1.

[0147] Preparation Example 2-13: Synthesis of other 2,6-dimethoxyl-substituted-4-pyrone compounds

[0148] Using one of the above routes, starting materials are selected from oxalic acid or diethyl oxalate, which are added to acetone or other ketones for addition reaction, then reduced, and reacted with one or two alcohols for etherification to obtain the corresponding substituted 2,6-dimethoxyl-substituted-4-pyrone products. When reacted with two alcohols, a mixture of three products is obtained, which is directly used as an internal electron donor composition without separation. The structures and NMR results of other 2,6-dimethoxyl-substituted-4-pyrone compounds are shown in Table 1.

[0149]

[0150] Table 1: 2,6-dimethoxyl-substituted-4-pyrone compounds prepared in Preparation Examples 1-13

[0151]

[0152]

[0153]

[0154] Preparation of catalysts

[0155] Example 1

[0156] In a 500 mL nitrogen-purged 5-neck flask with stirring, 10 g of MgCl2-2.5C2H5OH microspheres and 150 mL of titanium tetrachloride were added to prepare a suspension, then maintained at -15 °C for 1 hour, slowly warmed to 80 °C, 7 mmol of 2,6-dimethoxymethyl-4-pyrone and 3 mmol of 9,9-bis(methoxymethyl)fluorene were added, then continued to warm to 110 °C for 1 hour, then the liquid was filtered clean, the liquid was filtered off, the obtained solid was washed with 120 mL of titanium tetrachloride at 125 °C for 3 times. The obtained solid was washed with 150 mL of hexane at 60 °C for 4 times, the liquid was filtered off and dried, to obtain a solid catalyst component Cat-1.

[0157] Examples 2-13

[0158] The solid catalyst component was prepared according to the process shown in Example 1, except that 2,6-dimethoxymethyl-4-pyrone was replaced by 7 mmol of compounds a2-a13 in Table 1 in sequence, respectively.

[0159] Examples 14-25

[0160] The solid catalyst component was prepared according to the process shown in Example 1, except that 7 mmol of internal electron donors of type a and 3 mmol of internal electron donors of type b were added according to the internal electron donor numbers shown in Table 2, respectively.

[0161] Example 26

[0162] The solid catalyst component was prepared according to the process shown in Example 1, except that 5 mmol of 2,6-dimethoxymethyl-4-pyrone and 5 mmol of 9,9-bis(methoxymethyl)fluorene were added.

[0163] Example 27

[0164] The solid catalyst component was prepared according to the process shown in Example 1, except that 3 mmol of 2,6-dimethoxymethyl-4-pyrone and 7 mmol of 9,9-bis(methoxymethyl)fluorene were added.

[0165] Example 28

[0166] The solid catalyst component was prepared according to the process shown in Example 1, except that 2 mmol of 2,6-dimethoxymethyl-4-pyrone and 8 mmol of 9,9-bis(methoxymethyl)fluorene were added.

[0167] Examples 29-40

[0168] The solid catalyst component was prepared as shown in Example 1, except that 5 mmol / 3 mmol / 2 mmol of the three internal electron donor compounds were added according to the internal electron donor number shown in Table 2, respectively.

[0169] Examples 41-44

[0170] The solid catalyst component was prepared as shown in Example 1, except that a1, b1, b6 internal electron donor compounds were added according to the molar ratio (total amount of 10 mmol) shown in Table 2, respectively.

[0171] Comparative Example 1

[0172] The catalyst component was prepared as in Example 1, except that 7 mmol of a1 and 3 mmol of b1 internal electron donor compounds were replaced by 10 mmol of 2,6- dimethoxymethyl-4-pyrone (a1).

[0173] Comparative Example 2

[0174] The catalyst component was prepared as in Example 1, except that 7 mmol of a1 and 3 mmol of b1 internal electron donor compounds were replaced by 10 mmol of 2,6- dimethoxybenzyl-4-pyrone (a5).

[0175] Comparative Example 3

[0176] The catalyst component was prepared as in Example 1, except that 7 mmol of a1 and 3 mmol of b1 internal electron donor compounds were replaced by 10 mmol of 9,9- bis(methoxymethyl)fluorene (b1).

[0177] Comparative Example 4

[0178] The catalyst component was prepared as in Example 1, except that 7 mmol of a1 and 3 mmol of b1 internal electron donor compounds were replaced by 10 mmol of 2-isopropyl-2- isopentyl-1,3-dimethoxypropane (b2).

[0179] Comparative Example 5

[0180] The catalyst component was prepared as in Example 1, except that 7 mmol of a1 and 3 mmol of b1 internal electron donor compounds were replaced by 10 mmol of di-n-butyl phthalate (b3).

[0181] Comparative Example 6

[0182] The catalyst component was prepared as in Example 1 except that 7 mmol of a1 and 3 mmol of the internal electron donor compound b1 were replaced by 7 mmol of b1 and 3 mmol of b3.

[0183] Comparative Example 7

[0184] The catalyst component was prepared as in Example 1 except that 7 mmol of a1 and 3 mmol of the internal electron donor compound b1 were replaced by 7 mmol of b1 and 3 mmol of b7.

[0185] Comparative Example 8

[0186] The catalyst component was prepared as in Example 1 except that 7 mmol of a1 and 3 mmol of the internal electron donor compound b1 were replaced by 4 mmol of b1, 3 mmol of b2 and 3 mmol of b3.

[0187] Comparative Example 9

[0188] The catalyst component was prepared as in Example 1 except that 7 mmol of a1 and 3 mmol of the internal electron donor compound b1 were replaced by 4 mmol of b1, 3 mmol of b2 and 3 mmol of b7.

[0189] Comparative Example 10

[0190] The catalyst component was prepared as in Example 1 except that 7 mmol of a1 and 3 mmol of the internal electron donor compound b1 were replaced by 4 mmol of b1, 3 mmol of b2 and 3 mmol of b3.

[0191] Comparative Example 11

[0192] The catalyst component was prepared as in Example 1 except that 7 mmol of a1 and 3 mmol of the internal electron donor compound b1 were replaced by 4 mmol of b1, 3 mmol of b3 and 3 mmol of b12.

[0193] Polymerization:

[0194] After the 5 L stainless steel autoclave was sufficiently replaced with nitrogen, 5 mL of triethylaluminum hexane solution with a concentration of 0.5 mol / L and 1 mL of cyclohexylmethyl dimethoxysilane hexane solution with a concentration of 0.1 mol / L and 10 mg of the prepared solid catalyst component were added, then 10 mL of hexane was added to flush the feeding pipeline, 2 L (standard state) of hydrogen and 2.5 L of refined propylene were added, and the reaction was pre-polymerized at 25°C for 5 minutes, and then the temperature was increased to 70°C, and the polymerization reaction was carried out at this temperature for 1 hour. After the reaction was completed, the reaction kettle was cooled and the stirring was stopped, and the reaction product was discharged, and the polymer was obtained after drying. The polymerization data is shown in Table 2.

[0195] Table 2 Different complexing results under the same polymerization conditions

[0196]

[0197]

[0198]

[0199]

[0200]

[0201] [Note] b1: 9,9-bis(methoxymethyl)fluorene; b2: 2-isopropyl-2-isopentyl-1,3-dimethoxypropane; b3: di-n-butyl phthalate; b4: 2,4-pentanediol dibenzoate; b5: 1,2-benzenediol-4-tert-butyl-1,2-diacetate; b6: 1,2-benzenediol-4-tert-butyl-1,2-dibenzoate; b7: ethyl benzoate.

[0202] b2: 2-isopropyl-2-isopentyl-1,3-dimethoxypropane;

[0203] b3: di-n-butyl phthalate;

[0204] b4: 2,4-pentanediol dibenzoate;

[0205] b5: 1,2-benzenediol-4-tert-butyl-1,2-diacetate;

[0206] b6: 1,2-benzenediol-4-tert-butyl-1,2-dibenzoate;

[0207] b7: ethyl benzoate.

[0208] As can be seen from Table 2, the activity of the catalysts prepared by complexing 2,6-dicarboxylate-4-pyrone compound with various Lewis base compounds can be significantly improved, higher than the catalysts of single internal electron donor (Comparative Examples 1-5) and the catalysts of complex internal electron donors without 2,6-dicarboxylate-4-pyrone compound (Comparative Examples 6-9). It can be seen that 2,6-dicarboxylate-4-pyrone compound can coordinate with various Lewis base compounds to obtain higher activity than the catalysts of single internal electron donor (or internal electron donor without 2,6-dicarboxylate-4-pyrone compound). The catalysts can obtain polypropylene with high isotacticity, regular particle shape and high bulk density.

[0209] Examples 45-53

[0210] After the 5L stainless steel reactor was sufficiently replaced with nitrogen, 5 mL of triethylaluminum hexane solution with a concentration of 0.5 mol / L and 1 mL of the external electron donor hexane solution shown in Table 3 with a concentration of 0.1 mol / L and 10 mg of catalyst Cat-1 were added, then 10 mL of hexane was added to flush the feeding line, hydrogen was introduced according to the partial pressure in Table 3, and 2.5 L of refined propylene was added, the reaction was controlled to pre-polymerize at 25°C for 5 minutes, and then the temperature was raised to 70°C, and the polymerization reaction was carried out at this temperature for 1 hour. After the reaction was completed, the reactor was cooled and stirring was stopped, and the reaction product was discharged, and the polymer was obtained after drying. The polymerization data are shown in Table 3.

[0211] Examples 54-62

[0212] After the 5L stainless steel reactor was sufficiently replaced with nitrogen, 5 mL of triethylaluminum hexane solution with a concentration of 0.5 mol / L and 1 mL of the external electron donor hexane solution shown in Table 3 with a concentration of 0.1 mol / L and 10 mg of catalyst Cat-33 were added, then 10 mL of hexane was added to flush the feeding line, hydrogen was introduced according to the partial pressure in Table 3, and 2.5 L of refined propylene was added, the reaction was controlled to pre-polymerize at 25°C for 5 minutes, and then the temperature was raised to 70°C, and the polymerization reaction was carried out at this temperature for 1 hour. After the reaction was completed, the reactor was cooled and stirring was stopped, and the reaction product was discharged, and the polymer was obtained after drying. The polymerization data are shown in Table 3.

[0213] Table 3 Different external electron donors

[0214]

[0215] [Note] CMMS: methylcyclohexyldimethoxysilane;

[0216] DPDMS: dicyclopentyldimethoxysilane;

[0217] PETS: phenyltrimethoxysilane;

[0218] NPTMS: n-propyltrimethoxysilane.

[0219] Examples 63-70

[0220] After the 5L stainless steel reactor was sufficiently replaced with nitrogen, 5 mL of triethylaluminum hexane solution with a concentration of 0.5 mol / L and 1 mL of the external electron donor hexane solution shown in Table 3 with a concentration of 0.1 mol / L and 10 mg of catalyst Cat-1 were added, then 10 mL of hexane was added to flush the feeding line, hydrogen was introduced according to the partial pressure in Table 3, and 2.5 L of refined propylene was added, the reaction was controlled to pre-polymerize at 25°C for 5 minutes, and then the temperature was raised to 70°C, and the polymerization reaction was carried out at this temperature for 1 hour. After the reaction was completed, the reactor was cooled and stirring was stopped, and the reaction product was discharged, and the polymer was obtained after drying. The polymerization data are shown in Table 3.

[0221] Comparative Examples 10-13

[0222] The polymerization step is the same as in Example 64, except that the catalysts are the catalysts in Table 4, respectively.

[0223] Table 4 (without external donor)

[0224]

[0225] As can be seen from Table 3, the catalysts CAT-1 and CAT-33 prepared by compounding two or more internal donor compounds both show high activity, high isotacticity, high bulk density and good polymerization matching degree when polymerization is carried out with different external donors. With the increase of hydrogen, the melt index is significantly improved, which shows that the catalysts have good hydrogen sensitivity and are suitable for preparing polypropylene with high melt flow rate.

[0226] As can be seen from Table 4, even without external donor, high isotacticity polypropylene can still be obtained, and the activity is further improved, showing super-high activity, which is much higher than that of the catalysts without compounding or containing 2,6-dimethoxy-substituted-4-pyrone compound internal donor (Comparative Examples 10-13). The polymerization time is extended from 60 minutes to 120 minutes, and the catalyst can maintain super-high activity without attenuation. When low Al / Ti is used, the ash content of the obtained polypropylene is low, which can be reduced to 21 ppm.

[0227] The present application is not limited to the foregoing specific embodiments, and any changes or modifications made by those skilled in the art within the scope of the present application are encompassed within the scope of the patent of the present application.

Claims

1. An olefin polymerisation catalyst component characterised in that, The compound comprises Mg, Ti, halogen, at least one internal electron donor a compound and at least one internal electron donor b compound, wherein the internal electron donor a compound is selected from 2, 6-dimethoxy substituent-4-pyrone compound in general formula (I), the internal electron donor b compound is selected from Lewis base compound, and the Lewis base compound is selected from diether and ester electron donor compound; General formula (I) wherein R 1 , R 2 , R 3 and R 4 are the same or different, each independently selected from H, halogen, a C1-C 20 alkyl group, or a C1-C 20 group containing at least one heteroatom selected from N, O and halogen; R 1 and R 2 are not carbonyl groups.

2. The olefin polymerization catalyst component according to claim 1, characterized in that, R 1 , R 2 , R 3 and R 4 two or more of which are bonded to each other to form a ring.

3. The olefin polymerization catalyst component according to claim 1, characterized in that, R 1 , R 2 , R 3 and R 4 are the same or different, each independently selected from H, halogen, the following substituents of up to 20 carbon atoms: straight-chain or branched alkyl, cycloalkyl, alkenyl, ester, phenyl, alkylphenyl, phenylalkyl, indenyl, benzyl, halogenated or substituted with N, O heteroatoms alkyl, cycloalkyl, phenyl, alkylphenyl, phenylalkyl, indenyl, benzyl; or each independently selected from heterocyclic aromatic substituents.

4. The olefin polymerization catalyst component according to claim 1, characterized in that, R in general formula (I) 1 R 2 R 3 and R 4 are the same or different, each independently selected from the group consisting of H, halogen, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, t-butyl, n-pentyl, i-pentyl, cyclopentyl, n-hexyl, cyclohexyl, heptyl, octyl, nonyl, decyl, C 11 -C 20 straight-chain or branched alkyl groups having up to 20 carbon atoms, the following substituents having up to 20 carbon atoms: alkenyl, phenyl, m-chlorophenyl, p-chlorophenyl, o-chlorophenyl, m-methoxyphenyl, p-methoxyphenyl, o-methoxyphenyl, p-methylphenyl, p-nitrophenyl, m-nitrophenyl, substituted benzyl, substituted phenethyl, furanyl, pyrrolyl, propenyl, butenyl, pentenyl, hexenyl, indenyl.

5. The olefin polymerization catalyst component according to claim 1, wherein The 2, 6-dimethoxy substituent-4-pyrone compound of general formula (I) is at least one of 2, 6-dimethoxymethyl-4-pyrone, 2, 6-dimethoxyethyl-4-pyrone, 2, 6-dimethoxypropyl-4-pyrone, 2, 6-dimethoxybutyl-4-pyrone, 2, 6-dimethoxypentyl-4-pyrone, 2, 6-dimethoxyhexyl-4-pyrone, 2, 6-dimethoxyheptyl-4-pyrone, 2, 6-dimethoxyoctyl-4-pyrone, 2, 6-dimethoxydodecyl-4-pyrone, 2, 6-dimethoxytetradecyl-4-pyrone, 2, 6-dimethoxyhexadecyl-4-pyrone, 2, 6-dimethoxyphenyl-4-pyrone, 2, 6-dimethoxybenzyl-4-pyrone, 2, 6-dimethoxy-m-chlorophenyl-4-pyrone, 2, 6-dimethoxy-o-chlorophenyl-4-pyrone, 2, 6-dimethoxy-p-chlorophenyl-4-pyrone, 2, 6-dimethoxy-p-methylphenyl-4-pyrone, 2, 6-dimethoxy-p-methoxymethyl-4-pyrone, 2, 6-dimethoxyfuryl-4-pyrone, 2, 6-dimethoxypropenyl-4-pyrone, 2, 6-dimethoxymethyl-3, 5-dimethyl-4-pyrone, 2, 6-dimethoxymethyl-3-methyl-5-ethyl-4-pyrone, 2, 6-dimethoxymethyl-3, 5-diethyl-4-pyrone, 2, 6-dimethoxymethyl-3, 5-dibutyl-4-pyrone, 2, 6-dimethoxymethyl-3-ethyl-5-butyl-4-pyrone, 2, 6-dimethoxymethyl-3-methyl-5-butyl-4-pyrone.

6. The olefin polymerization catalyst component according to claim 1, wherein, The feeding molar ratio of the internal electron donor a compound to the internal electron donor b compound is greater than or equal to 2:

8.

7. The olefin polymerization catalyst component according to claim 1, wherein The ester electron donor compound is monobasic carboxylic acid ester and polybasic carboxylic acid ester electron donor compound.

8. The olefin polymerization catalyst component according to claim 1, wherein, The Lewis base compound is selected from 1, 3-diether compound shown in general formula (II): General formula (II) In general formula (II), R 7 -R 12 are the same or different, each independently selected from H, or each independently selected from a linear or branched alkyl group containing 1 to 18 carbon atoms, a cycloalkyl group, an aryl group, an alkylaryl group, or an arylalkyl group; R 13 and R 14 are the same or different, each independently selected from a linear or branched alkyl group of 1 to 20 carbon atoms, a cycloalkyl group of 3 to 20 carbon atoms, an aryl group of 5 to 20 carbon atoms, an alkylaryl group of 7 to 20 carbon atoms, and an arylalkyl group of 7 to 20 carbon atoms.

9. The olefin polymerization catalyst component according to claim 8, characterized in that, R 7 -R 14 one or more groups in -R are linked to form a ring structure.

10. The olefin polymerization catalyst component according to claim 8, characterized in that, The diether electron donor compound is selected from diether compound shown in general formula (III): General formula (III) In general formula (III), R 21 -R 28 are identical or different and each independently selected from H, or each independently selected from linear or branched alkyl groups containing 1 to 18 carbon atoms, cycloalkyl groups, aryl groups, alkylaryl groups or arylalkyl groups; R 15 -R 18 are identical or different and each independently selected from H, or each independently selected from linear or branched alkyl groups containing 1 to 18 carbon atoms, cycloalkyl groups, aryl groups, alkylaryl groups or arylalkyl groups; R 19 and R 20 are identical or different and each independently selected from linear or branched alkyl groups containing 1 to 20 carbon atoms, cycloalkyl groups containing 3 to 20 carbon atoms, aryl groups containing 5 to 20 carbon atoms, alkylaryl groups and arylalkyl groups containing 7 to 20 carbon atoms.

11. The olefin polymerization catalyst component according to claim 10, characterized in that, R 15 -R 28 one or more groups in -R are linked to form a ring structure.

12. The olefin polymerization catalyst component of claim 7, wherein, The polybasic carboxylic acid ester electron donor compound is aromatic dibasic carboxylic acid ester compound or aliphatic chain dibasic carboxylic acid ester compound.

13. The olefin polymerization catalyst component of claim 1, wherein, The ester electron donor compound is diol ester compound of general formula (IV): General formula (IV) In general formula (IV), R 29 -R 36 are each independently selected from hydrogen, halogen, or substituted or unsubstituted linear or branched C1-C 20 alkyl, C3-C 20 cycloalkyl, C6-C 20 aryl, C7-C 20 alkylaryl, C7-C 20 aralkyl, C2-C 10 alkenyl, or C 10 -C 20 fused ring aryl; but R 31 and R 32 are not hydrogen, R 29 -R 36 one or more of which are optionally annelated or unannelated.

14. The olefin polymerization catalyst component of claim 1, wherein, The ester electron donor compound is ortho-phenylene diester of general formula (V): General formula (V) In general formula (V), R 37 and R 38 are the same or different, each independently selected from substituted or unsubstituted linear or branched C1-C 20 alkyl, C3-C 20 cycloalkyl, C6-C 20 substituted or unsubstituted aryl, C7-C 20 substituted or unsubstituted aralkyl, C2-C 10 alkenyl, C 10 -C 20 fused ring aryl, or ester group, and R 37 and R 38 are not hydrogen; R 39 -R 42 are the same or different, each independently selected from hydrogen, substituted or unsubstituted C1-C 20 hydrocarbyl group, C1-C 20 alkoxy group, a heteroatom, and combinations thereof.

15. The olefin polymerization catalyst component of claim 1, wherein, The ester electron donor compound is compound shown in general formula (VI): General formula (VI) In general formula (VI), R 43 -R 56 each independently of one another, is selected from the group consisting of hydrogen, a substituted hydrocarbyl group comprising 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group comprising 1 to 20 carbon atoms, an alkoxy group comprising 1 to 20 carbon atoms, a heteroatom, and combinations thereof.

16. The olefin polymerization catalyst component according to claim 15, characterized in that, In general formula (VI), R 43 at least one of -R 46 is selected from the group consisting of a substituted hydrocarbyl group comprising 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group comprising 1 to 20 carbon atoms, and combinations thereof; R 47 at least one of -R 56 is selected from the group consisting of a substituted hydrocarbyl group comprising 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group comprising 1 to 20 carbon atoms, an alkoxy group comprising 1 to 20 carbon atoms, and combinations thereof.

17. The olefin polymerization catalyst component of claim 1, wherein The composition of the catalyst component comprises a titanium compound, a magnesium compound, the 2,6-dimethoxy-substituted-4-pyrone compound and a Lewis base compound; The precursor of the magnesium compound is selected from X. n Mg(OR a ) 2-n MgCl2·mR a OH, R a 2-n MgX n At least one of the following: a mixture of MgCl2 / SiO2, MgCl2 / Al2O3, magnesium halide, and titanium alkoxide, wherein m is 0.1-6, 0≤n≤2, X is a halogen, and R a For C1-C 20 hydrocarbon group; The general formula of the titanium compound is TiX N (OR b ) 4-N , wherein R b is a C1-C 20 hydrocarbon group, X is halogen, and N is 1-4.

18. The olefin polymerization catalyst component of claim 17, wherein, The magnesium compound is an alcoholate of a magnesium dihalide; Alternatively, the magnesium compound is a liquid magnesium compound; Alternatively, the magnesium compound is a derivative of a magnesium dihalide molecule in which at least one halogen atom is replaced by a hydrocarbyloxy group or a halogenated hydrocarbyloxy group.

19. The olefin polymerization catalyst component of claim 17, wherein, The titanium compound comprises at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, an alkoxy titanium halide; The alkoxy titanium halide comprises at least one of methoxy titanium trichloride, ethoxy titanium trichloride, propoxy titanium trichloride, n-butoxy titanium trichloride, dimethoxy titanium dichloride, diethoxy titanium dichloride, dipropoxy titanium dichloride, di-n-butoxy titanium dichloride, trimethoxy titanium chloride, triethoxy titanium chloride, tripropoxy titanium chloride, tri-n-butoxy titanium chloride.

20. The olefin polymerization catalyst component of claim 17, wherein, The total of the internal electron donor a compound and the internal electron donor b compound is in a molar ratio of 0.01-5.0 to the magnesium compound calculated as magnesium element.

21. A catalyst for olefin polymerization, the raw material composition of which comprises the catalyst component of any one of claims 1-20 and an organic aluminum compound.

22. The catalyst of claim 21, wherein, The general formula of the organic aluminum compound is AlR c p X (3-p) wherein R c is hydrogen or a C1-C 20 hydrocarbon group, X is halogen, and p is an integer of 0≤p≤3.

23. The catalyst of claim 21, wherein The organic aluminum compound comprises at least one of a trialkyl aluminum compound, an alkyl aluminum halide, an alkyl aluminum hydride, an alkyl aluminum sesquichloride, an alkyl aluminum alkoxide.

24. The catalyst of claim 21, wherein, The molar ratio of the organic aluminum compound to the titanium atom in the catalyst component is 1-1000:

1.

25. The catalyst of claim 21, wherein, The raw material composition of the catalyst further comprises an external electron donor; The external electron donor is a siloxane compound; The general formula of the siloxane compound is R' t Si(OR'') 4-t wherein R' and R'' are each independently selected from a C1-C 18 hydrocarbon group, and t is an integer of 0 < t < 3.

26. The catalyst of claim 25, wherein, The molar ratio of silicon in the external electron donor to titanium in the catalyst component is 0.002-100.

27. Use of the catalyst of any one of claims 21-26 in olefin polymerization.

28. The use according to claim 27, characterized in that, The olefin comprises at least one of ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 3-methyl-1-butene, 4-methyl-1-pentene, butadiene, vinylcyclopentene, vinylcyclohexene; The polymerization comprises homopolymerization or copolymerization.

29. The use according to claim 27, characterized in that, The temperature of the polymerization is ≤200℃, The pressure of the polymerization is ≤10 MPa.

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