A catalyst component for olefin polymerization, the catalyst, and its application.

Abstract

This invention proposes a catalyst component, catalyst, and their applications for olefin polymerization, belonging to the field of olefin polymerization technology. The catalyst component contains products obtained from the reaction of a magnesium source, a titanium source, and an internal electron donor, wherein the internal electron donor comprises furan compounds and diether compounds. The catalyst of this invention exhibits high hydrogen sensitivity and stereoregulation, with a good balance between the two. The molecular weight distribution of the prepared low melt index polymer is broader than that of the high melt index polymer, and the catalyst component of this invention does not contain phthalate compounds (plasticizers).

Description

Technical Field

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

[0002] As is well known, Zn catalysts have become the mainstay of industrial olefin polymerization catalysts since their inception. Electron-donating compounds are an essential component of catalysts, playing 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 being updated and upgraded.

[0003] As internal electron donors driving the development of Zn catalysts, the use of phthalate esters in third-generation Zn catalysts has evolved from monocarboxylic acid esters, such as ethyl benzoate and ethyl p-ethoxybenzoate, to dicarboxylic acid esters, such as di(iso)butyl phthalate in fourth-generation Zn catalysts. Phthalate esters (plasticizers) are currently the most commonly used internal electron donors in polypropylene catalysts. However, studies have found that they can cause serious damage to the growth, development, and reproductive systems of animals, and may also have similar effects on humans. The United States, the European Union, and other countries and regions have successively listed these compounds as toxic chemicals, and their uses (especially in infant toys) are strictly limited. Therefore, the development of high-performance catalysts free of phthalate esters is imperative. Summary of the Invention

[0004] In the course of our research, we unexpectedly discovered that using a combination of furan and diether compounds as internal electron donor catalysts exhibits a good balance between hydrogen sensitivity and stereoregulation. Particularly noteworthy is the broad molecular weight distribution of polymers prepared under low-hydrogen polymerization conditions, which effectively improves polymer processing performance. Conversely, with increasing hydrogen content, the molecular weight distribution of polymers prepared under high-hydrogen polymerization conditions narrows. This reduces the content of small molecules in high melt index polymers, thus helping to reduce precipitate content. Furthermore, high melt index products themselves possess good processing properties. Based on this discovery, we propose this invention.

[0005] In a first aspect, 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, said internal electron donor comprising a furan compound and a diether compound.

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

[0007] (i) at least one of the above-mentioned catalyst components;

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

[0009] (iii) An optional external electron donor.

[0010] A third aspect of the present invention provides the application of the above-described catalyst in olefin polymerization reactions.

[0011] This invention employs an internal electron donor containing furan compounds and diether compounds, without using phthalate compounds, thus the catalyst is a non-plasticizing catalyst.

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

[0013] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0014] According to a first aspect of the present invention, a catalyst component for olefin polymerization is provided, the catalyst component containing products obtained by reacting a magnesium source, a titanium source and an internal electron donor, said internal electron donor comprising furan compounds and diether compounds.

[0015] According to the present invention, in the preparation process of the catalyst component, the molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor can be 1:15-180:0.1-1. Preferably, the molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and 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 furan compounds and diether compounds containing specific substituents in the internal electron donor is 70% to 100% by weight, preferably 80% to 100% by weight.

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

[0018] According to a preferred embodiment of the present invention, the amount of furan compound used relative to each mole of diether compound can be 0.1 to 2 moles, preferably 0.15 to 1 mole. The above-mentioned preferred amounts of both can be better synergistically formulated, the catalyst has a good balance between hydrogen sensitivity and stereodirection, and the molecular weight distribution of the prepared polymer can be narrowed with the increase of melt index, thereby taking into account both good processing performance and environmental friendliness.

[0019] In this invention, the furan compound can be any furan compound capable of being 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 C3. 20 Straight-chain or branched alkyl groups, C3-C 20 cycloalkyl, C6-C 20 aryl, C7~C 20 Aryl groups or C7-C 20 The alkylaryl group; R2 and R4 are each independently selected from C1 to C4. 10 Straight-chain or branched alkyl groups, C3-C4 10 cycloalkyl, C6-C 10 aryl, C7~C 10 Aryl groups or C7-C 10 Alkyl aryl.

[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, ( At least one of (3R,3aR,6S,6aR)-3,6-diethoxyhexahydrofuran[3,2-b]furan and (3R,3aR,6S,6aR)-3,6-dipropoxyhexahydrofuran[3,2-b]furan; more preferably, the furan-containing compound is (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuran[3,2-b]furan.

[0023] According to the present invention, the diether compound can be any diether compound capable of being 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 shown in formula (II).

[0024]

[0025] In formula (II), R Ⅰ R Ⅱ R Ⅲ R Ⅳ R Ⅴ and R ⅥWhether the atoms are the same or different, they are each independently selected from hydrogen, halogen atoms, C1 to C2 atoms. 20 Straight-chain or branched alkyl groups, C3-C4 20 cycloalkyl, C6-C 20 aryl, C7~C 20 Aryl groups or C7-C 20 alkylaryl, R Ⅰ ~R Ⅵ The groups can be optionally bonded to form a ring; R Ⅶ and R Ⅷ Whether they are the same or different, each is independently selected from C1 to C2. 20 Straight-chain or branched alkyl groups, C3-C4 20 cycloalkyl, C6-C 20 aryl, C7~C 20 alkylaryl or C7~C 20 Aryl groups.

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

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

[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 includes: contacting a magnesium source with a titanium source, and adding an internal electron donor during one or more time periods before, during and after the contacting reaction of the magnesium source and the titanium source. The components of the internal electron donor can be added separately or simultaneously. The internal electron donor includes furan compounds and diether compounds.

[0031] Specifically, the reaction between 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 can be added, and the mixture can be stirred and mixed at this temperature for 10 to 60 minutes. Afterward, the temperature can be raised to the reaction temperature (i.e., approximately 60 to 130°C) and maintained at this temperature for 0.5 to 10 hours. In the method for preparing the catalyst component for olefin polymerization, the internal electron donor is added during one or more time periods before, during, and after the reaction between the magnesium source and the titanium source. The time period before the reaction between the magnesium source and the titanium source refers to the time period after the magnesium source is added to the reactor and before the temperature is raised to the reaction temperature.

[0032] According to the 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 can be various alkylaluminum compounds conventionally used in the art. For example, the general formula of the alkylaluminum can 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, iodine.

[0038] Specifically, the alkylaluminum compound can be selected from one or more of triethylaluminum, triisobutylaluminum, tributylaluminum, trihexylaluminum, chloro-diethylaluminum, chloro-diisobutylaluminum, chloro-dibutylaluminum, chloro-dihexylaluminum, dichloro-ethylaluminum, dichloro-isobutylaluminum, dichloro-dibutylaluminum, and dichloro-dihexylaluminum.

[0039] According to the present invention, the amount of the alkylaluminum compound can be a conventional amount in the art. The molar ratio of aluminum in the alkylaluminum compound to titanium in the catalyst component can be (1 to 20,000):1, preferably (20 to 500):1, more preferably (30 to 300):1.

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

[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 to C 18 The hydrocarbon group, optionally containing heteroatoms; x and y are each independent integers from 0 to 2, z is an integer from 1 to 3, and the sum of x, y, and z is 4. R 17 R 18 Preferably C3~C 10 Alkyl groups, C3-C 10 cycloalkyl groups, optionally containing heteroatoms; R 19 Preferably C1 to C 10 Alkyl groups, optionally containing heteroatoms.

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

[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 aluminum in the alkylaluminum compound can be 1:(1-300), preferably 1:(2-100).

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

[0045] A third aspect of the present invention provides the application of the above-described catalyst in olefin polymerization reactions.

[0046] When the catalyst of the present invention is used in olefin polymerization, the catalyst components, alkylaluminum compounds, and optional external electron donors can be added to the polymerization reactor separately, or they can be added to the polymerization reactor after mixing, or the olefins can be prepolymerized using a prepolymerization method known in the art before being added to the polymerization reactor. According to a preferred embodiment of the present invention, after the catalyst components, alkylaluminum compounds, and optional external electron donors have undergone pre-contact reaction, and before the polymerization reaction, the catalyst is preferably prepolymerized with propylene and / or other α-olefin monomers. The prepolymerization reaction temperature can be 5–40°C, preferably 10–30°C.

[0047] In this invention, the specific types of olefins, the polymerization reaction methods and conditions of the olefins can all be conventionally selected based on existing technologies.

[0048] The catalyst of the present invention is particularly suitable for the general formula CH2=CHR 1 The homopolymerization and copolymerization reactions of olefins, wherein R 1 It is hydrogen, C1-C6 alkyl, or C6-C6 alkyl. 12 Aryl groups.

[0049] According to the present invention, the polymerization reaction of the olefin can be carried out according to existing methods, specifically, under the protection of an inert gas, in a liquid monomer or an inert solvent containing the monomer, or in the gas phase, or through a combined gas-liquid phase polymerization process. The polymerization temperature can generally be 0–150°C, preferably 60–90°C. The polymerization pressure can be atmospheric pressure or higher, for example, 0.01–10 MPa, preferably 0.01–5 MPa, more preferably 0.1–4 MPa; all pressures in this invention refer to gauge pressure. During the polymerization process, hydrogen can be added to the reaction system as a polymer molecular weight regulator to adjust the polymer molecular weight and melt index. Furthermore, the types and amounts of the inert gas and solvent used in the polymerization reaction of the olefin are well known to those skilled in the art and will not be described further here.

[0050] Parameters not specified in this invention are all conventional techniques in the field.

[0051] The present invention will be further described below with reference to embodiments, but the invention is not limited to these embodiments.

[0052] The molecular weight distribution (Mw / Mn) of the polymer in this invention was determined using a PL-GPC220 gel permeation chromatograph manufactured by Polymer Laboratories, UK. Trichlorobenzene was used as the solvent, the test temperature was 150℃, polystyrene was used as the standard, the flow rate was 1.0 mL / min, and a 3×Plgel 10mMlXED-B 300×7.5nm column was used.

[0053] The polymer melt index in this invention was determined according to GB3682-2000 at 230°C and a load of 2.16 kg.

[0054] The isotactic index of the polymer in this invention is determined by heptane extraction.

[0055] Examples 1-4 illustrate the catalyst components, catalysts, and applications of the present invention for olefin polymerization.

[0056] Example 1

[0057] (1) Preparation of catalyst components

[0058] In a 300 mL glass reaction flask, 90 mL of titanium tetrachloride was added and cooled to -20 °C. 38 mmol of magnesium halide support (based on elemental magnesium) was added, and the temperature was raised to 112 °C. During the heating process, 2.6 mmol of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan and 8 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added. After maintaining the temperature at 110 °C for 30 min, the liquid was filtered off, washed with titanium tetrachloride, then washed with hexane, and dried under vacuum to obtain the catalyst component Cat-1 for olefin polymerization.

[0059] (2) Propylene liquid-phase bulk polymerization

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

[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 the 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-dimethoxyhexahydrofurano[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 the 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-dimethoxyhexahydrofurano[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 the 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. The difference was that (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan was not added during the preparation of the catalyst component. Instead, 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. The difference was that 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was not added during the preparation of the catalyst component. Instead, 11 mmol of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[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. 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-dimethoxyhexahydrofurano[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 the 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] As can be seen from Table 1, when the internal electron donor contains a certain proportion of furan compounds and diether compounds, the catalyst has high hydrogen sensitivity and stereodirection, and the balance between hydrogen sensitivity and stereodirection is good. Furthermore, the molecular weight distribution of the prepared low melt index polymer is wider than that of the high melt index polymer. Moreover, the catalyst component of the present invention does not contain phthalate compounds (plasticizers).

[0081] Any numerical value mentioned in this invention, if there is only a two-unit interval between any minimum and any maximum value, includes all values ​​that increase by one unit each time from the minimum to the maximum value. For example, if the amount of a component, or the value of a process variable such as temperature, pressure, or time, is stated as 50-90, in this specification it means specifically listing values ​​such as 51-89, 52-88… and 69-71 and 70-71, etc. For non-integer values, it may be appropriately considered that a unit is 0.1, 0.01, 0.001, or 0.0001. These are merely some specifically 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 for explaining the present invention and do not constitute any limitation on 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 terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A catalyst component for olefin polymerization, characterized in that, The catalyst component contains products obtained by reacting a magnesium source, a titanium source, and an internal electron donor, wherein the internal electron donor comprises furan compounds and diether compounds; The amount of furan compounds used is 0.1 to 2 moles per mole of diether compounds; The furan compound is selected from at least one of the furan compounds shown in formula (I). Equation (I) In equation (Ⅰ), R1 and R3 are each independently selected from hydrogen, C1~C1, C2, C3, C4, C5, C6, C7, C8, C9 ... 20 Straight-chain or branched alkyl groups, C3~C 20 cycloalkyl, C6~C 20 aryl, C7~C 20 Aryl groups or C7~C 20 The alkylaryl group; R2 and R4 are each independently selected from C1 to C4. 10 Straight-chain or branched alkyl groups, C3~C 10 cycloalkyl, C6~C 10 aryl, C7~C 10 Aryl groups or C7~C 10 Alkyl aryl.

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 compounds and diether compounds in the internal electron donor is 70% to 100% by weight. And / or, relative to each mole of diether compound, the amount of furan compound is 0.15 to 1 mole.

3. The catalyst component according to claim 2, characterized in that, Based on the total weight of the internal electron donor, the total content of the furan compounds and diether compounds in the internal electron donor is 80% to 100% by weight.

4. The catalyst component according to any one of claims 1 to 3, characterized in that, The furan compounds are selected from at least one of (3R,3aR,6S,6aR)-3-methoxy-6-propoxyhexahydrofuran[3,2-b]furan, (3R,3aR,6S,6aR)-3-methoxy-6-ethoxyhexahydrofuran[3,2-b]furan, (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuran[3,2-b]furan, (3R,3aR,6S,6aR)-3,6-diethoxyhexahydrofuran[3,2-b]furan, and (3R,3aR,6S,6aR)-3,6-dipropoxyhexahydrofuran[3,2-b]furan.

5. The catalyst component according to claim 4, characterized in that, The furan compound is (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan.

6. 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 shown in formula (II). Formula (II) In formula (II), R Ⅰ R Ⅱ R Ⅲ R Ⅳ R Ⅴ and R Ⅵ Whether the atoms are the same or different, they are each independently selected from hydrogen, halogen atoms, and C1~C2 atoms. 20 Straight-chain or branched alkyl groups, C3~C 20 cycloalkyl, C6~C 20 aryl, C7~C 20 Aryl groups or C7~C 20 alkylaryl, R Ⅰ ~R Ⅵ The groups can be optionally bonded to form a ring; R Ⅶ and R Ⅷ Whether they are the same or different, each is independently selected from C1 to C2. 20 Straight-chain or branched alkyl groups, C3~C 20 cycloalkyl, C6~C 20 aryl, C7~C 20 alkylaryl or C7~C 20 Aryl groups.

7. The catalyst component according to claim 6, characterized in that, The diether compounds are selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2-phenylethyl)-1,3-dimethoxypropane, 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(p-chlorophenyl)-1,3-dimethoxypropane, 2-(diphenylmethyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, 2,2- Dicyclopentyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2,2-bis( 2-Cyclohexylethyl)-1,3-dimethoxypropane, 2-methyl-2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-bis(cyclohexylmethyl)-1,3-dimethoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2-(1-methylbutyl)-2-isopropyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, 2 At least one of 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.

8. The catalyst component according to claim 7, characterized in that, The diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane or 9,9-dimethoxymethylfluorene.

9. The catalyst component according to any one of claims 1 to 3, characterized in that, The molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor is 1:15~180:0.1~1; And / or, the magnesium source is selected from at least one of magnesium halides, magnesium alcohols, magnesium haloalkanes, and magnesium halide adduct supports; 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 Titanium compounds, wherein R′ is C1~C 20 The alkyl group, Z is F, Cl, Br or I, a is an integer from 1 to 3, and b is an integer from 1 to 4.

10. The catalyst component according to claim 9, characterized in that, The molar ratio of magnesium source (calculated as magnesium element), titanium source (calculated as titanium element), and internal electron donor is 1:18~150:0.15~0.9; And / or, the titanium source is selected from one or more of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tributoxychloride, titanium dibutoxychloride, titanium butoxytrichloride, titanium triethoxychloride, titanium diethoxychloride, titanium triethoxychloride, and titanium trichloride.

11. 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 10; (ii) at least one alkylaluminum compound; and (iii) An optional external electron donor.

12. The catalyst according to claim 11, characterized in that, The molar ratio of aluminum in the alkylaluminum compound to titanium in the catalyst component is (1~2000):1; And / or, the molar ratio of the external electron donor to aluminum in the alkylaluminum compound is 1:(1~300).

13. The catalyst according to claim 12, characterized in that, The molar ratio of aluminum in the alkylaluminum compound to titanium in the catalyst component is (20~500):1; And / or, the molar ratio of the external electron donor to aluminum in the alkylaluminum compound is 1:(2~100).

14. The catalyst according to claim 13, characterized in that, The molar ratio of aluminum in the alkylaluminum compound to titanium in the catalyst component is (30~300):

1.

15. The catalyst according to any one of claims 11-14, characterized in that, The general formula of the alkylaluminum is AlR n X 3-n , where R is an alkyl group having 1 to 8 carbon atoms, the hydrogen on the alkyl group is optionally substituted by a halogen atom, X is a halogen, and n is an integer of 0 < n ≤ 3; And / or, the external electron donor is selected from at least one of carboxylic acids, carboxylic anhydrides, carboxylic esters, ketones, ethers, alcohols, lactones, organophosphorus compounds, and organosilicon compounds.

16. The catalyst according to claim 15, characterized in that, The C1-C8 alkyl group is methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl, or n-octyl, and the halogen is fluorine, chlorine, bromine, or iodine; And / or, the external electron donor is selected from those containing at least one Si-OR 19 The key and the general formula is (R) 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, wherein R 17 R 18 and R 19 Each independently is C1~C 18 The hydrocarbon group, optionally containing heteroatoms; x and y are each independent integers from 0 to 2, z is an integer from 1 to 3, and the sum of x, y, and z is 4.

17. The catalyst according to claim 16, characterized in that, The alkylaluminum compound is selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, di-n-hexylaluminum chloride, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, and di-n-hexylaluminum chloride. And / or, R 17 R 18 For C3~C 10 Alkyl or C3~C 10 cycloalkyl groups, optionally containing heteroatoms, R 19 C1~C 10 Alkyl groups, optionally containing heteroatoms.

18. The catalyst according to claim 17, characterized in that, 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.

19. 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 10 and / or the catalyst according to any one of claims 11 to 18; The general formula of the olefin is CH2=CHR 1 R 1 It is hydrogen, C1-C6 alkyl or C6-C 12 Aryl groups.

20. The olefin polymerization reaction according to claim 19, characterized in that, The polymerization reaction temperature is 0~150℃; the polymerization reaction pressure is 0.01~10MPa; And / or, prior to the polymerization reaction, the catalyst component and / or the catalyst is subjected to a prepolymerization reaction with an olefin; the temperature of the prepolymerization reaction is 5~40°C.

21. The olefin polymerization reaction according to claim 20, characterized in that, The polymerization reaction is carried out at a temperature of 60~90℃ and at a pressure of 0.01~5MPa. And / or, prior to the polymerization reaction, the catalyst component and / or the catalyst is subjected to a prepolymerization reaction with an olefin; the temperature of the prepolymerization reaction is 10~30°C.

22. The olefin polymerization reaction according to claim 21, characterized in that, The polymerization reaction is carried out at a pressure of 0.1~4 MPa.

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