Catalyst component for olefin polymerization, catalyst and application thereof

Abstract

The invention provides a catalyst component for olefin polymerization, a catalyst and application thereof, and belongs to the technical field of olefin polymerization. The catalyst component contains a product obtained by reaction of a magnesium source, a titanium source and an internal electron donor, and the internal electron donor contains a furan compound and a diether compound. The catalyst disclosed by the invention has high hydrogen regulation sensitivity and stereospecificity, the balance between the hydrogen regulation sensitivity and the stereospecificity is good, and the molecular weight distribution of the prepared low-melt-index polymer is wider than that of a high-melt-index polymer; the components of the catalyst provided by the invention do not contain phthalate compounds (plasticizers).

Description

Technical Field

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

[0002] As we all know, ZN catalyst has become the main catalyst for industrial olefin polymerization reaction after continuous development since its advent. Electron donor compound is one of the essential components of catalyst components, which plays a decisive role in important indicators such as polymerization activity, polymer isotacticity, polymer molecular weight and molecular weight distribution. With the development of electron donors, olefin polymerization catalysts are constantly updated.

[0003] As the internal electron donor that promotes the development of ZN catalysts, it has developed from monobasic acid ester compounds of the third-generation ZN catalyst, such as ethyl benzoate and ethyl p-ethoxybenzoate, to dibasic acid ester compounds, such as di(iso)butyl phthalate of the fourth-generation ZN catalyst. Phthalate compounds (plasticizers) are currently the most commonly used internal electron donors in polypropylene catalysts. According to research, they can cause serious damage to the growth and development and reproductive system of animals, and may also have similar effects on humans. Countries and regions such as the United States and the European Union have successively listed such compounds as toxic chemicals, and their use (especially in infant toys, etc.) is strictly restricted. Therefore, it is imperative to develop high-performance catalysts that do not contain phthalate compounds. Summary of the invention

[0004] The present invention unexpectedly discovered during research that a catalyst using a furan compound and a diether compound as an internal electron donor has a good balance of hydrogen sensitivity and stereospecificity, and is particularly outstanding in that the polymer prepared under low hydrogen polymerization conditions has a wide molecular weight distribution, which can effectively improve the processing performance of the polymer, and with the increase of hydrogen, the molecular weight distribution of the polymer prepared under high hydrogen polymerization conditions becomes narrower, which can reduce the content of small molecules in the high melt index polymer, which is conducive to reducing the content of precipitates, and the high melt index product itself has good processing performance. Based on this discovery, the present invention is proposed.

[0005] In a first aspect of the present invention, a catalyst component for olefin polymerization is provided. The catalyst component contains a product obtained by reacting a magnesium source, a titanium source and an internal electron donor. The internal electron donor comprises a furan compound and a diether compound.

[0006] The second aspect of the present invention provides a catalyst for olefin polymerization, the catalyst comprising the following components:

[0007] (i) at least one catalyst component as described above;

[0008] (ii) at least one alkylaluminum compound; and

[0009] (iii) Optional external electron donor.

[0010] The third aspect of the present invention provides use of the above catalyst in olefin polymerization.

[0011] The present invention adopts an internal electron donor comprising a furan compound and a diether compound, and does not use a phthalate compound, so the catalyst is a non-plasticizer catalyst.

[0012] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0013] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0014] According to a first aspect of the present invention, the present invention provides a catalyst component for olefin polymerization, the catalyst component comprising a product obtained by reacting a magnesium source, a titanium source and an internal electron donor, wherein the internal electron donor comprises a furan compound and a diether compound.

[0015] According to the present invention, in the preparation process of the catalyst component, the molar ratio of the amount of the magnesium source calculated as magnesium element, the titanium source calculated as titanium element and the internal electron donor can be 1:15-180:0.1-1. Preferably, the molar ratio of the amount of the magnesium source calculated as magnesium element, the titanium source calculated as titanium element and the internal electron donor is 1:18-150:0.15-0.9.

[0016] According to the present invention, based on the total weight of the internal electron donor, the total content of the furan compound and the diether compound containing specific substituents in the internal electron donor is 70 wt % to 100 wt %, preferably 80 wt % to 100 wt %.

[0017] According to the present invention, the furan compound and the diether compound in the internal electron donor can produce a synergistic effect.

[0018] According to a preferred embodiment of the present invention, the amount of the furan compound can be 0.1 to 2 moles, preferably 0.15 to 1 mole, relative to each mole of the diether compound. The two can be synergistically formulated better by using the above preferred amounts. The catalyst has a good balance between hydrogen sensitivity and stereospecificity, and the molecular weight distribution of the prepared polymer can be narrowed with the increase of the melt index, thereby achieving good processing performance and environmental protection.

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

[0020]

[0021] In formula (I), R1 and R3 are each independently selected from hydrogen, C1 to C 20 Straight or branched alkyl, C3~C 20 Cycloalkyl, C6~C 20 Aryl, C7~C 20 Arylalkyl or C7~C 20 R2 and R4 are each independently selected from C1 to C 10 Straight or branched alkyl, C3~C 10 Cycloalkyl, C6~C 10 Aryl, C7~C 10 Arylalkyl or C7~C 10 Alkyl.

[0022] Preferably, the furan compound is selected from (3R,3aR,6S,6aR)-3-methoxy-6-propoxyhexahydrofurano[3,2-b]furan, (3R,3aR,6S,6aR)-3-methoxy-6-ethoxyhexahydrofurano[3,2-b]furan, (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan, ( More preferably, the furan-containing compound is at least one of (3R,3aR,6S,6aR)-3,6-diethoxyhexahydrofuro[3,2-b]furan and (3R,3aR,6S,6aR)-3,6-dipropoxyhexahydrofuro[3,2-b]furan; more preferably, the furan-containing compound is (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan.

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

[0024]

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

[0026] Preferably, the diether compound is selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2-phenylethyl)-1,3-dimethoxypropane, 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(p-chlorophenyl)-1,3-dimethoxypropane, 2-(diphenylmethyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, 2 ,2-dicyclopentyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2,2- Bis(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-methyl-2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-bis(cyclohexylmethyl)-1,3-dimethoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2-(1-methylbutyl)-2-isopropyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, At least one of 2-phenyl-2-isopropyl-1,3-dimethoxypropane, 2-phenyl-2-sec-butyl-1,3-dimethoxypropane, 2-benzyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclohexyl-2-sec-butyl-1,3-dimethoxypropane, 2-isopropyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane and 9,9-dimethoxymethylfluorene.

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

[0028] In the present invention, the magnesium source can be various magnesium-containing compounds that can be used as catalysts for olefin polymerization, for example, the magnesium source can be a magnesium halide, an alcoholate of magnesium, a halogenated alcoholate of magnesium, or a magnesium halide adduct carrier, etc. The magnesium halide can be, for example, magnesium chloride and / or magnesium bromide. The alcoholate of magnesium can be, for example, diethoxymagnesium. The halogenated alcoholate of magnesium can be, for example, ethoxymagnesium chloride. The types of the magnesium halide adduct carrier are well known to those skilled in the art, for example, the magnesium halide adduct carriers disclosed in patent documents CN1091748, CN101050245, CN101486722, CN102796132B, CN102796129B and CN102796128B, and the relevant contents disclosed in these patent documents are all introduced into the present invention as a reference.

[0029] According to the present invention, the titanium source can be a conventional choice in the art, for example, the titanium source can be a titanium source having a general formula of Ti(OR′) 3-a Z a and / or Ti(OR′) 4-b Z b A titanium compound wherein R′ is C1-C 20 alkyl, Z is F, Cl, Br or I, a is an integer of 1 to 3, and b is an integer of 1 to 4. Preferably, the titanium source is one or more of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, tributoxytitanium chloride, dibutoxytitanium dichloride, butoxytitanium trichloride, triethoxytitanium chloride, diethoxytitanium dichloride, ethoxytitanium trichloride and titanium trichloride.

[0030] The catalyst component for olefin polymerization of the present invention can be prepared by conventional methods. For example, the preparation method of the catalyst component comprises: contacting a magnesium source with a titanium source, and adding an internal electron donor in one or more time periods before, during and after the contacting reaction of the magnesium source with the titanium source. The components of the internal electron donor can be added separately or simultaneously. The internal electron donor comprises a furan compound and a diether compound.

[0031] Specifically, the reaction of the magnesium source and the titanium source can be carried out in the same manner as in the prior art, for example, the titanium source can be cooled to below 0°C (preferably -5 to -30°C), then the magnesium source is added, and the mixture is stirred and mixed at this temperature for 10 to 60 minutes, and then the temperature is raised to the reaction temperature (i.e., about 60 to 130°C), and the reaction temperature is maintained for 0.5 to 10 hours. In the method for preparing the catalyst component for olefin polymerization, the internal electron donor is added in one or more time periods before, during and after the reaction of the magnesium source and the titanium source. The time period before the reaction of the magnesium source and the titanium source refers to the time period after the magnesium source is added to the reactor and before the temperature is raised to the reaction temperature.

[0032] According to a second aspect of the present invention, the present invention provides a catalyst for olefin polymerization, which catalyst comprises the following components:

[0033] (i) at least one of the above catalyst components;

[0034] (ii) at least one alkylaluminum compound; and

[0035] (iii) an optional external electron donor.

[0036] In the present invention, the alkylaluminum compound may be various alkylaluminum compounds conventionally used in the art. For example, the general formula of the alkylaluminum may be AlR n X 3-n , where R is an alkyl group having 1 to 8 carbon atoms, the hydrogen on the alkyl group is optionally substituted by a halogen atom, X is a halogen, and n is an integer of 0 < n ≤ 3.

[0037] Specific examples of the alkyl group having 1 to 8 carbon atoms may include, but are not limited to: methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl, n-octyl, and the halogen may be fluorine, chlorine, bromine, or iodine.

[0038] Specifically, the alkylaluminum compound may be selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, di-n-hexylaluminum chloride, ethylaluminum dichloride, isobutylaluminum dichloride, n-butylaluminum dichloride, and n-hexylaluminum dichloride.

[0039] According to the present invention, the amount of the alkylaluminum compound used may be a conventional amount in the art. The molar ratio of aluminum in the alkylaluminum compound to titanium in the catalyst component may be (1 to 2000):1, preferably (20 to 500):1, more preferably (30 to 300):1.

[0040] In the present invention, the external electron donor may be various external electron donors commonly used in the art. For example, the external electron donor may be selected from at least one of carboxylic acids, carboxylic anhydrides, carboxylic esters, ketones, ethers, alcohols, lactones, organophosphorus compounds, and organosilicon compounds.

[0041] Preferably, the external electron donor is selected from a silicon compound containing at least one Si-OR 19 bond and having the general formula (R 17 ) x (R 18 ) y Si(OR 19 ) z , where R 17 , R 18 and R19 Each independently is C1~C 18 The hydrocarbon group optionally contains heteroatoms; x and y are each independently an integer of 0 to 2, z is an integer of 1 to 3, and the sum of x, y, and z is 4. 17 , R 18 Preferably C3~C 10 Alkyl, C3~C 10 The cycloalkyl group optionally contains heteroatoms; R 19 Preferably C1~C 10 The alkyl group may contain a heteroatom.

[0042] Specifically, the external electron donor can be selected from at least one of cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl-tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane and (1,1,1-, trifluoro-2-propyl)-methyldimethoxysilane.

[0043] According to the present invention, the amount of the external electron donor can be a conventional amount in the art. The molar ratio of the external electron donor to the aluminum in the alkyl aluminum compound can be 1:(1-300), preferably 1:(2-100).

[0044] According to the present invention, in the preparation process of the catalyst for olefin polymerization, the alkyl aluminum compound and the optional external electron donor can be mixed with the catalyst components for olefin polymerization separately and then reacted, or the alkyl aluminum compound and the optional external electron donor can be mixed first and then mixed with the catalyst components for olefin polymerization and reacted.

[0045] The third aspect of the present invention provides use of the above catalyst in olefin polymerization.

[0046] When the catalyst of the present invention is used for olefin polymerization, the catalyst component, the alkyl aluminum compound, and the optional external electron donor can be added to the polymerization reactor separately, or mixed and added to the polymerization reactor, or the olefin can be prepolymerized by a prepolymerization method known in the industry and then added to the polymerization reactor. According to a preferred embodiment of the present invention, after the catalyst component, the alkyl aluminum compound, and the optional external electron donor are pre-contacted and reacted, the catalyst is preferably prepolymerized with propylene and / or other α-olefin monomers before the polymerization reaction. The prepolymerization reaction temperature can be 5 to 40°C, preferably 10 to 30°C.

[0047] In the present invention, the specific type of olefin, the polymerization method and conditions of olefin can be conventionally selected according to the prior art.

[0048] The catalyst of the present invention is particularly suitable for the general formula CH2=CHR 1 Homopolymerization and copolymerization of olefins, wherein R 1 is hydrogen, C1-C6 alkyl or C6-C 12 The aromatic group.

[0049] According to the present invention, the polymerization reaction of the olefin can be carried out according to the existing method, specifically, under the protection of an inert gas, in a liquid phase monomer or an inert solvent containing a polymerizable monomer, or in a gas phase, or by a combined polymerization process in a gas-liquid phase. The temperature of the polymerization reaction can generally be 0 to 150° C., preferably 60 to 90° C. The pressure of the polymerization reaction can be normal pressure or higher, for example, 0.01 to 10 MPa, preferably 0.01 to 5 MPa, more preferably 0.1 to 4 MPa, and the pressure of the present invention refers to the gauge pressure. In the polymerization process, hydrogen can be used as a polymer molecular weight regulator and added to the reaction system to adjust the molecular weight and melt index of the polymer. In addition, in the polymerization process of the olefin, the type and amount of the inert gas and solvent are well known to those skilled in the art and will not be repeated here.

[0050] Parameters not limited in the present invention are all conventional technical means in the art.

[0051] The present invention will be further described below in conjunction with embodiments, but is not limited by these embodiments.

[0052] The molecular weight distribution (Mw / Mn) of the polymer in the present invention was measured by a PL-GPC220 gel permeation chromatograph produced by Polymer Laboratories, UK, with trichlorobenzene as solvent, test temperature of 150°C, polystyrene as standard, flow rate of 1.0 mL / min, and 3×Plgel 10 mMlXED-B 300×7.5 nm column.

[0053] The polymer melt index in the present invention is measured according to GB3682-2000 at 230°C and a load of 2.16 kg.

[0054] The isotactic index of the polymer in the present invention is measured by the heptane extraction method.

[0055] Examples 1 to 4 are used to illustrate the catalyst components and catalysts for olefin polymerization and their applications according to the present invention.

[0056] Example 1

[0057] (1) Preparation of catalyst components

[0058] In a 300 mL glass reaction bottle, add 90 mL of titanium tetrachloride and cool to -20°C, add 38 mmol of a magnesium halide carrier in terms of magnesium element, then heat to 112°C, and add 2.6 mmol of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuran[3,2-b]furan and 8 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane during the heating process. After maintaining at 110°C for 30 min, filter out the liquid, wash with titanium tetrachloride, then wash with hexane, and vacuum dry to obtain the catalyst component Cat-1 for olefin polymerization.

[0059] (2) Propylene liquid phase bulk polymerization

[0060] The bulk polymerization of propylene in liquid phase was carried out in a 5L stainless steel autoclave. Under nitrogen protection, 2mL of triethylaluminum hexane solution (concentration of 0.5mmol / mL), 0.4mL of cyclohexylmethyldimethoxysilane (CHMMS) hexane solution (concentration of 0.1mmol / mL) and 9mg of the above-mentioned catalyst component Cat-1 for olefin polymerization were added to the reactor in sequence. The autoclave was closed, and hydrogen and 2.3L of liquid propylene were added. The temperature was raised to 70°C, and after reacting for 1 hour, the temperature was lowered, the pressure was released, and the material was discharged. The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0061] Example 2

[0062] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was not added during the heating process, and the amounts of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan and 9,9-dimethoxymethylfluorene added were 5 mmol and 7.5 mmol, respectively, to obtain a catalyst component Cat-2 for olefin polymerization.

[0063] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0064] Example 3

[0065] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that the amounts of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuran[3,2-b]furan and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane added during the heating process were 7 mmol and 6 mmol, respectively, to obtain a catalyst component Cat-3 for olefin polymerization.

[0066] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0067] Example 4

[0068] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that the amounts of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuran[3,2-b]furan and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane added during the heating process were 2 mmol and 8 mmol, respectively, to obtain a catalyst component Cat-4 for olefin polymerization.

[0069] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0070] Comparative Example 1

[0071] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that in the preparation process of the catalyst component, (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuran[3,2-b]furan was not added, and only 11 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was added to obtain the catalyst component DCat-1 for olefin polymerization; the obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0072] Comparative Example 2

[0073] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that in the preparation process of the catalyst component, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was not added, and only 11 mmol of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuran [3,2-b] furan was added to obtain the catalyst component DCat-2 for olefin polymerization; the obtained propylene homopolymer was dried, weighed and analyzed, and the results are shown in Table 1.

[0074] Comparative Example 3

[0075] The catalyst component was prepared and propylene liquid phase bulk polymerization was carried out according to the method of Example 1, except that the amounts of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuran[3,2-b]furan and 2-isopropyl-2-isopentyl-1,3-dimethoxypropane added during the heating process were 8.7 mmol and 3.2 mmol, respectively, to obtain a catalyst component DCat-3 for olefin polymerization.

[0076] The obtained propylene homopolymer was dried, weighed and analyzed. The results are shown in Table 1.

[0077] Table 1

[0078]

[0079]

[0080] It can be seen from Table 1 that when the internal electron donor contains a certain proportion of furan compounds and diether compounds, the catalyst has high hydrogen modulation sensitivity and stereospecificity, and the balance between hydrogen modulation sensitivity and stereospecificity is good, and the molecular weight distribution of the prepared low melt index polymer is wider than that of the high melt index polymer, and the catalyst component of the present invention does not contain phthalate compounds (plasticizers).

[0081] Any numerical value mentioned in the present invention, if there is only an interval of two units between any minimum value and any maximum value, includes all values ​​from the minimum value to the maximum value each time increasing by one unit. For example, if the amount of a component, or the value of a process variable such as temperature, pressure, time, etc. is declared to be 50-90, in this specification it means that 51-89, 52-88... and 69-71 and 70-71 are specifically listed. For non-integer values, 0.1, 0.01, 0.001 or 0.0001 can be appropriately considered as a unit. These are just some specially specified examples. In this application, in a similar manner, all possible combinations of numerical values ​​between the listed minimum and maximum values ​​are considered to have been disclosed.

[0082] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein, on the contrary, the present invention can be extended to all other methods and applications with the same functions.

Claims

1. A catalyst component for olefin polymerization, characterized in that The catalyst component contains a product obtained by reacting a magnesium source, a titanium source and an internal electron donor, and the internal electron donor comprises a furan compound and a diether compound.

2. The catalyst component according to claim 1, characterized in that Based on the total weight of the internal electron donor, the total content of the furan compound and the diether compound in the internal electron donor is 70 wt % to 100 wt %, preferably 80 wt % to 100 wt %; And / or, the amount of the furan compound used is 0.1 to 2 moles, preferably 0.15 to 1 mole, per mole of the diether compound.

3. The catalyst component according to claim 1 or 2, characterized in that The furan compound is selected from at least one of the furan compounds represented by formula (I), In formula (I), R1 and R3 are each independently selected from hydrogen, C1 to C 20 Straight or branched alkyl, C3~C 20 Cycloalkyl, C6~C 20 Aryl, C7~C 20 Arylalkyl or C7~C 20 R2 and R4 are each independently selected from C1 to C 10 Straight or branched alkyl, C3~C 10 Cycloalkyl, C6~C 10 Aryl, C7~C 10 Arylalkyl or C7~C 10 Alkaryl; Preferably, the furan compound is selected from at least one of (3R,3aR,6S,6aR)-3-methoxy-6-propoxyhexahydrofuro[3,2-b]furan, (3R,3aR,6S,6aR)-3-methoxy-6-ethoxyhexahydrofuro[3,2-b]furan, (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan, (3R,3aR,6S,6aR)-3,6-diethoxyhexahydrofuro[3,2-b]furan, and (3R,3aR,6S,6aR)-3,6-dipropoxyhexahydrofuro[3,2-b]furan; More preferably, the furan compound is (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan.

4. The catalyst component according to any one of claims 1 to 3, characterized in that The diether compound is selected from at least one of the diether compounds represented by formula (II), In formula (II), R Ⅰ , R Ⅱ , R Ⅲ , R Ⅳ , R Ⅴ and R Ⅵ the same or different, each independently selected from hydrogen, halogen atoms, C1-C 20 Straight or branched alkyl, C3~C 20 Cycloalkyl, C6~C 20 Aryl, C7~C 20 Arylalkyl or C7~C 20 The alkylaryl group, R Ⅰ ~R Ⅵ The groups of R may be optionally bonded to form a ring; Ⅶ and R Ⅷ The same or different, each independently selected from C1 to C 20 Straight or branched alkyl, C3~C 20 Cycloalkyl, C6~C 20 Aryl, C7~C 20 Alkyl or C7~C 20 Aralkyl; Preferably, the diether compound is selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2-phenylethyl)-1,3-dimethoxypropane, 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(p-chlorophenyl)-1,3-dimethoxypropane, 2-(diphenylmethyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, 2 ,2-dicyclopentyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2,2- Bis(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-methyl-2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-bis(cyclohexylmethyl)-1,3-dimethoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2-(1-methylbutyl)-2-isopropyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, at least one of 2-phenyl-2-isopropyl-1,3-dimethoxypropane, 2-phenyl-2-sec-butyl-1,3-dimethoxypropane, 2-benzyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclohexyl-2-sec-butyl-1,3-dimethoxypropane, 2-isopropyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane and 9,9-dimethoxymethylfluorene; More preferably, the diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane or 9,9-dimethoxymethylfluorene.

5. The catalyst component according to any one of claims 1 to 4, characterized in that The molar ratio of the magnesium source calculated as magnesium element, the titanium source calculated as titanium element, and the internal electron donor is 1:15-180:0.1-1, preferably 1:18-150:0.15-0.9; And / or, the magnesium source is selected from at least one of magnesium halide, magnesium alcoholate, magnesium haloalcoholate and magnesium halide adduct carrier; And / or, the titanium source is selected from the general formula Ti(OR′) 3-a Z a and / or Ti(OR′) 4-b Z b A titanium compound, wherein R′ is C1 to C 20 alkyl, Z is F, Cl, Br or I, a is an integer of 1 to 3, and b is an integer of 1 to 4; preferably, the titanium source is selected from one or more of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, tributoxytitanium chloride, dibutoxytitanium dichloride, butoxytitanium trichloride, triethoxytitanium chloride, diethoxytitanium dichloride, ethoxytitanium trichloride and titanium trichloride.

6. A catalyst for olefin polymerization, characterized in that The catalyst comprises the following components: (i) at least one catalyst component according to any one of claims 1 to 5; (ii) at least one alkylaluminum compound; and (iii) Optional external electron donor.

7. The catalyst according to claim 6, characterized in that The molar ratio of aluminum in the alkyl aluminum compound to titanium in the catalyst component is (1-2000):1, preferably (20-500):1, and more preferably (30-300):1; And / or, the molar ratio of the external electron donor to the aluminum in the alkyl aluminum compound is 1:(1-300), preferably 1:(2-100).

8. The catalyst according to claim 6 or 7, characterized in that The general formula of the alkylaluminum is AlR n X 3-n , where R is an alkyl group having 1 to 8 carbon atoms, the hydrogen on the alkyl group is optionally substituted by a halogen atom, X is a halogen, and n is an integer of 0 < n ≤ 3; Preferably, the C1-C8 alkyl group is methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl or n-octyl, and the halogen is fluorine, chlorine, bromine or iodine; More preferably, the alkylaluminum compound is selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum monochloride, diisobutylaluminum monochloride, di-n-butylaluminum monochloride, di-n-hexylaluminum monochloride, monoethylaluminum dichloride, monoisobutylaluminum dichloride, mono-n-butylaluminum dichloride and mono-n-hexylaluminum dichloride; and / or, the external electron donor is selected from at least one of carboxylic acid, carboxylic anhydride, carboxylic ester, ketone, ether, alcohol, lactone, organophosphorus compound and organosilicon compound; Preferably, the external electron donor is selected from a group containing at least one Si-OR 19 bond and the general formula is (R 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, where R 17 , R 18 and R 19 Each independently is C1~C 18 A hydrocarbon group optionally containing heteroatoms; x and y are each independently an integer of 0 to 2, z is an integer of 1 to 3, and the sum of x, y, and z is 4; Preferably, R 17 , R 18 C3~C 10 Alkyl or C3~C 10 The cycloalkyl group optionally contains heteroatoms, R 19 C1~C 10 An alkyl group optionally containing heteroatoms; More preferably, the external electron donor is selected from at least one of cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl-tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane and (1,1,1-, trifluoro-2-propyl)-methyldimethoxysilane.

9. An olefin polymerization reaction, characterized in that: The olefin is polymerized in the presence of the catalyst component according to any one of claims 1 to 5 and / or the catalyst according to any one of claims 6 to 8; The general formula of the olefin is CH2=CHR 1 , R 1 is hydrogen, C1-C6 alkyl or C6-C 12 The aromatic group.

10. The olefin polymerization reaction according to claim 9, characterized in that: The polymerization reaction temperature is 0 to 150° C., preferably 60 to 90° C.; the polymerization reaction pressure is 0.01 to 10 MPa, preferably 0.01 to 5 MPa, more preferably 0.1 to 4 MPa; And / or, before the polymerization reaction, the catalyst component and / or the catalyst is subjected to a prepolymerization reaction with the olefin; the temperature of the prepolymerization reaction is 5 to 40°C, preferably 10 to 30°C.

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