Process for isotactic polymerization of alpha-olefins and alpha-olefin isotactic polymer

Abstract

The present invention relates to the field of olefin polymerization, and discloses a method for isotactic polymerization of alpha-olefin and an alpha-olefin isotactic polymer, the method for isotactic polymerization of alpha-olefin of the present invention comprises: carrying out an isotactic polymerization reaction on alpha-olefin by using a catalyst composition, the catalyst composition comprises the following components: a) a transition metal compound; and b) a co-catalyst component. The method for isotactic polymerization of alpha-olefin according to the present invention has the advantage of improving catalytic activity and isotactic isotropism of the polymer.

Description

Technical Field

[0001] The invention relates to the field of olefin polymerization, in particular to a method for isotactic polymerization of alpha-olefin and an isotactic polymer of alpha-olefin. Background Art

[0002] Single-site catalysts for olefin polymerization have been a research hotspot in organometallic chemistry, catalysis, polymer chemistry, and materials science in recent decades. Using this type of catalyst, olefin polymers with uniform molecular weight distribution and chemical composition distribution can be obtained, and the molecular structure and molecular weight of the polymer can be highly controllable by adjusting the catalyst structure. Since this type of catalyst is highly efficient and broad-spectrum when applied to olefin copolymerization (ChemistrySelect 2020, 5, 7581-7585), olefin polymers that cannot be obtained with traditional Ziegler-Natta catalysts can be obtained by using this type of catalyst.

[0003] Non-metallocene transition metal catalysts are important components of single-site catalysts. They have rich ligand structures and simple synthesis processes. Their catalytic performance can be easily adjusted by adjusting the ligand structure (Chemical Reviews, 2003, 103, 283-315).

[0004] The isotactic polymerization of α-olefins is usually determined by the specific configuration of the catalyst, and only a specific catalyst structure can achieve the isotactic polymerization of α-olefins. Summary of the invention

[0005] The object of the present invention is to provide a new method for isotactic polymerization of α-olefins and the isotactic α-olefin polymers prepared therefrom. The method for isotactic polymerization of α-olefins of the present invention has the advantages of improving the catalytic activity and the isotacticity of the polymer.

[0006] In order to achieve the above object, the present invention provides a method for isotactic polymerization of α-olefins, wherein the method comprises: using a catalyst composition to perform an isotactic polymerization reaction of α-olefins,

[0007] Wherein, the catalyst composition comprises the following components:

[0008] a) a transition metal compound having a structure represented by formula (1);

[0009] b) a co-catalyst component,

[0010]

[0011] In formula (1), M is a tetravalent transition metal atom; X and Y are each independently a hydrocarbonoxy group having 1 to 10 carbon atoms or a halogen.

[0012] Preferably, M is a titanium atom, a zirconium atom or a hafnium atom, more preferably a titanium atom or a zirconium atom.

[0013] Preferably, X and Y are each independently a hydrocarbonoxy group having 1 to 6 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.

[0014] Preferably, X and Y are each independently a hydrocarbonoxy group having 1 to 3 carbon atoms or a chlorine atom.

[0015] Preferably, the alkoxy group having 1 to 10 carbon atoms is methoxy, ethoxy, propoxy or isopropoxy.

[0016] Preferably, X and Y are both isopropoxy or ethoxy; or, X and Y are both chlorine atoms.

[0017] Preferably, the co-catalyst component comprises a combination of an organoaluminum compound and an organomagnesium compound; more preferably, the co-catalyst component is a combination of an organoaluminum compound and an organomagnesium compound.

[0018] Preferably, the organoaluminum compound is a compound having a structure represented by the general formula AlX1X2X3, wherein X1, X2 and X3 are respectively a halogen atom, an alkyl group having 1-8 carbon atoms, an alkoxy group having 1-8 carbon atoms, and an aryloxy group having 6-12 carbon atoms, and X1, X2 and X3 may be the same or different, and at least one is an alkyl group having 1-8 carbon atoms.

[0019] Preferably, the organoaluminum compound is diethylaluminum chloride and / or dimethylaluminum chloride.

[0020] Preferably, the organic magnesium compound is an organic magnesium compound containing two alkyl groups with carbon atoms of 1-10, preferably an organic magnesium compound containing two alkyl groups with carbon atoms of 1-6, and more preferably di-n-butyl magnesium.

[0021] Preferably, the co-catalyst component is a combination of an organic aluminum compound and an organic magnesium compound, the molar ratio of the transition metal compound to the organic aluminum compound is 1:(30-5000), preferably 1:(100-1000), more preferably 1:(100-500), and the molar ratio of the transition metal compound to the organic magnesium compound is 1:(10-2000), preferably 1:(100-1000).

[0022] Preferably, the molar ratio of the organoaluminum compound to the organomagnesium compound is greater than 2.5:1.

[0023] Preferably, the concentration of the transition metal compound in the isotactic polymerization reaction system is 1×10 -10 mol / L~1×10 -3mol / L, preferably 1×10 -8 mol / L~1×10 -5 mol / L.

[0024] Preferably, the temperature of the isotactic polymerization reaction is -50 to 200° C., and the time of the isotactic polymerization reaction is 1 to 300 minutes; more preferably, the temperature of the isotactic polymerization reaction is -20 to 150° C., and the time of the isotactic polymerization reaction is 5 to 60 minutes.

[0025] Preferably, the α-olefin is a terminal olefin containing 3 to 18 carbon atoms, preferably one or more of propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene.

[0026] According to a second aspect of the present invention, there is provided an α-olefin isotactic polymer prepared by the method for preparing an α-olefin isotactic polymer according to the first aspect of the present invention.

[0027] Through the above technical scheme, the present invention can provide a new method for isotactic polymerization of α-olefins and the prepared isotactic α-olefin polymers. The method of the present invention can further improve the catalytic activity and the isotacticity of the polymer. DETAILED DESCRIPTION

[0028] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0029] The first aspect of the present invention provides a method for isotactic polymerization of α-olefins, wherein the method comprises: using a catalyst composition to perform an isotactic polymerization reaction on α-olefins,

[0030] Wherein, the catalyst composition comprises the following components:

[0031] a) a transition metal compound having a structure represented by formula (1);

[0032] b) a co-catalyst component,

[0033]

[0034] In formula (1), M is a tetravalent transition metal atom; X and Y are each independently a hydrocarbonoxy group having 1 to 10 carbon atoms or a halogen.

[0035] According to the present invention, in formula (1), M is a tetravalent transition metal atom, preferably, M is a titanium atom, a zirconium atom or a hafnium atom; more preferably, M is a titanium atom or a zirconium atom.

[0036] According to the present invention, in formula (1), X and Y are each independently a hydrocarbyloxy group having 1 to 10 carbon atoms or a halogen; preferably, X and Y are each independently a hydrocarbyloxy group having 1 to 6 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom or an iodine atom; more preferably, X and Y are each independently a hydrocarbyloxy group having 1 to 3 carbon atoms or a chlorine atom.

[0037] Examples of the hydrocarbonoxy group having 1 to 10 carbon atoms include methoxy, ethoxy, propoxy, isopropoxy, butoxy, tert-butoxy, sec-butoxy, isobutoxy, pentyloxy, and hexyloxy. Among them, methoxy, ethoxy, propoxy, and isopropoxy are preferred, ethoxy, propoxy, and isopropoxy are more preferred, and ethoxy and isopropoxy are still more preferred.

[0038] Examples of the halogen atom include fluorine, chlorine, bromine and iodine, preferably fluorine, chlorine or bromine, more preferably chlorine or bromine, and particularly preferably chlorine.

[0039] In a particularly preferred embodiment of the present invention, X and Y are both isopropoxy or ethoxy.

[0040] In another particularly preferred embodiment of the present invention, X and Y are both chlorine atoms.

[0041] As specific transition metal compounds, preferably the following compounds can be mentioned:

[0042] In formula (1), M is a titanium atom, and X and Y are both isopropoxy groups;

[0043] In formula (1), M is a titanium atom, and X and Y are both ethoxy groups;

[0044] In formula (1), M is a titanium atom, and X and Y are both chlorine atoms;

[0045] In formula (1), M is a zirconium atom, and X and Y are both isopropoxy groups;

[0046] In formula (1), M is a zirconium atom, and X and Y are both ethoxy groups;

[0047] In formula (1), M is a zirconium atom, and X and Y are both chlorine atoms;

[0048] In formula (1), M is a hafnium atom, and X and Y are both isopropoxy groups;

[0049] In formula (1), M is a hafnium atom, and X and Y are both ethoxy groups;

[0050] In formula (1), M is a hafnium atom, and X and Y are both chlorine atoms.

[0051] In the present invention, the transition metal compound can be synthesized according to conventional methods in the art. In a preferred embodiment of the present invention, when X and Y in formula (1) are each independently a hydrocarbon oxy group having 1 to 10 carbon atoms, the preparation method of the transition metal compound comprises: in an inert atmosphere and in the presence of a first organic solvent, a first contact reaction is carried out between 10-hydroxybenzo[H]quinoline and a compound represented by the general formula MA4 (hereinafter referred to as method 1).

[0052] In method 1, in the compound represented by the general formula MA4, M is a tetravalent transition metal atom; and A is independently a hydrocarbonoxy group having 1 to 10 carbon atoms.

[0053] Preferably, M is a titanium atom, a zirconium atom or a hafnium atom, more preferably a titanium atom or a zirconium atom.

[0054] Preferably, each A is independently a hydrocarbyloxy group having 1 to 6 carbon atoms; more preferably, each A is independently a hydrocarbyloxy group having 1 to 3 carbon atoms.

[0055] Examples of the hydrocarbonoxy group having 1 to 10 carbon atoms include methoxy, ethoxy, propoxy, isopropoxy, butoxy, tert-butoxy, sec-butoxy, isobutoxy, pentyloxy, and hexyloxy. Among them, methoxy, ethoxy, propoxy, and isopropoxy are preferred, ethoxy, propoxy, and isopropoxy are more preferred, and ethoxy and isopropoxy are still more preferred.

[0056] In method 1, the molar ratio of 10-hydroxybenzo[H]quinoline to the compound represented by the general formula MA4 can be 1.8-2.2:1, preferably 1.9-2.1:1, and more preferably 1.95-2.05:1.

[0057] In method 1, the first organic solvent may be an organic solvent that is inert to the reaction raw materials and can dissolve the reaction raw materials, for example, toluene may be used. The amount of the organic solvent may be selected according to the amount of 10-hydroxybenzo[H]quinoline, for example, the amount of the first organic solvent relative to 1 mol of 10-hydroxybenzo[H]quinoline is 5-30 L, preferably 6-20 L, more preferably 7-15 L, and particularly preferably 8-10 L.

[0058] In method 1, the inert atmosphere may be implemented by using nitrogen gas and / or argon gas.

[0059] In method 1, the conditions of the first contact reaction can be selected according to the boiling point of the first organic solution used, for example, the reaction can be carried out under reflux conditions for 5-20 hours, preferably 5-10 hours.

[0060] In method 1, after the first contact reaction is completed, the product may be purified by a conventional purification method in the art. For example, after the first contact reaction is completed, the solvent may be removed and washing may be performed to obtain the target product.

[0061] In a preferred embodiment of the present invention, after the first contact reaction is completed, the solvent is removed, and then centrifugal washing is performed 2-3 times using ice-cold hexane to obtain the target product.

[0062] In addition, when X and Y in formula (1) are each independently a halogen, the preparation method of the transition metal compound comprises: in an inert atmosphere and in the presence of a second organic solvent, subjecting 10-hydroxybenzo[H]quinoline to a second contact reaction with an n-butyllithium solution, and then subjecting it to a third contact reaction with a compound represented by MX4 (hereinafter referred to as method 2).

[0063] In method 2, in the compound represented by the general formula MX4, M is a tetravalent transition metal atom; and X is independently a halogen.

[0064] Preferably, M is a titanium atom, a zirconium atom or a hafnium atom, more preferably a titanium atom or a zirconium atom.

[0065] Examples of the halogen atom include fluorine, chlorine, bromine and iodine, preferably fluorine, chlorine or bromine, more preferably chlorine or bromine, and particularly preferably chlorine.

[0066] In method 2, the molar ratio of 10-hydroxybenzo[H]quinoline to n-butyllithium can be 1:0.95-1.5, preferably 1:1-1.2, and more preferably 1:1-1.1.

[0067] As the above-mentioned n-butyl lithium solution, for example, n-butyl lithium hexane solution can be used. When used in the form of a solution, the content of n-butyl lithium in the solution can be, for example, 1-3 mol / L, preferably 2-3 mol / L, and more preferably 2-2.5 mol / L.

[0068] In method 2, the second organic solvent may be an organic solvent that is inert to the reaction raw materials and can dissolve the reaction raw materials, for example, toluene may be used. The amount of the organic solvent may be selected according to the amount of 10-hydroxybenzo[H]quinoline, for example, relative to 1 mol of 10-hydroxybenzo[H]quinoline, the amount of the first organic solvent is 5-30 L, preferably 6-20 L, more preferably 7-15 L, and particularly preferably 7-9 L.

[0069] In method 2, the inert atmosphere may be implemented by using nitrogen and / or argon.

[0070] In method 2, the second contact reaction is preferably carried out by dropwise adding an n-butyl lithium solution into a mixed solution of 10-hydroxybenzo[H]quinoline and the second organic solvent.

[0071] The temperature of the second contact reaction during the dropwise addition may be -30 to 0° C., preferably -20 to -10° C. After the dropwise addition is completed, the reaction may be carried out at room temperature (eg, 10 to 40° C.) for 5 to 36 hours, preferably 12 to 24 hours.

[0072] In method 2, the molar ratio of 10-hydroxybenzo[H]quinoline to the compound represented by the general formula MX4 can be 1.8-2.2:1, preferably 1.9-2.1:1, and more preferably 1.95-2.05:1.

[0073] In method 2, the third contact reaction is preferably carried out by dropwise adding the n-butyllithium solution into the product of the first contact reaction to carry out the third contact reaction.

[0074] The temperature of the third contact reaction during the dropwise addition may be -30 to 0° C., preferably -20 to -10° C. After the dropwise addition is completed, the reaction may be carried out at room temperature (eg, 10 to 40° C.) for 5 to 36 hours, preferably 12 to 24 hours.

[0075] In method 2, after the third contact reaction is completed, the product may be purified by a conventional purification method in the art. For example, after the third contact reaction is completed, the solvent may be removed and washing may be performed to obtain the target product.

[0076] In a preferred embodiment of the present invention, after the third contact reaction is completed, a solid phase is obtained by solid-liquid separation, and centrifugation washing is performed 2-3 times using ice-cold hexane to obtain the target product.

[0077] In addition, in the present invention, the target product in method 2 can be prepared by replacing the hydrocarbon group with 1-10 carbon atoms in the target product obtained by method 1 with a halogen group; similarly, the target product in method 2 can be prepared by replacing the halogen group with a hydrocarbon group with 1-10 carbon atoms. The specific method can be implemented by conventional synthesis methods in the art.

[0078] According to the present invention, preferably, the co-catalyst component comprises a combination of an organoaluminum compound and an organomagnesium compound; more preferably, the co-catalyst component is a combination of an organoaluminum compound and an organomagnesium compound.

[0079] According to the present invention, the organoaluminum compound can be various organoaluminum compounds used as co-catalysts in the art. Preferably, the organoaluminum compound is a compound having a structure shown in the general formula AlX1X2X3, wherein X1, X2 and X3 are respectively a halogen atom, an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, and an aryloxy group having 6 to 12 carbon atoms, and X1, X2 and X3 can be the same or different, and at least one is an alkyl group having 1 to 8 carbon atoms.

[0080] Examples of the alkyl group having 1 to 8 carbon atoms include methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, sec-butyl, isobutyl, pentyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, neopentyl, 1-methylbutyl, 2-methylbutyl, isopentyl, hexyl, heptyl, and octyl.

[0081] Examples of the alkoxy group having 1 to 8 carbon atoms include various alkoxy groups having the above-mentioned "alkyl group having 1 to 8 carbon atoms" specifically exemplified.

[0082] Examples of the halogen atom include fluorine, chlorine, bromine and iodine, preferably fluorine, chlorine or bromine, more preferably chlorine or bromine, and particularly preferably chlorine.

[0083] In the present invention, specific examples of the organic aluminum compound include: one or more of trimethylaluminum, triethylaluminum, triisobutylaluminum, tripropylaluminum, tributylaluminum, triisopropylaluminum, tri-sec-butylaluminum, tricyclopentylaluminum, tri-n-pentylaluminum, triisopentylaluminum, trihexylaluminum, ethyldimethylaluminum, methyldiethylaluminum, tripentylaluminum, diethylaluminum chloride and dimethylaluminum chloride.

[0084] Furthermore, in the present invention, the organoaluminum compound preferably contains at least one hydrocarbon group and at least one halogen atom, more preferably is a dialkylaluminum chloride, and further preferably is diethylaluminum chloride or dimethylaluminum chloride.

[0085] In the present invention, the organic magnesium compound is preferably an organic magnesium compound containing two alkyl groups with carbon atoms of 1 to 10, and more preferably an organic magnesium compound containing two alkyl groups with carbon atoms of 1 to 6. For example, dimethyl magnesium, diethyl magnesium, di-n-propyl magnesium, di-n-butyl magnesium, di-n-pentyl magnesium, di-n-hexyl magnesium, etc. are mentioned, among which di-n-propyl magnesium, di-n-butyl magnesium and di-n-pentyl magnesium are preferably one or more, and di-n-butyl magnesium is more preferably.

[0086] When the co-catalyst component is a combination of an organoaluminum compound and an organomagnesium compound, the molar ratio of the transition metal compound to the organoaluminum compound is 1:(30-5000), preferably 1:(100-1000), more preferably 1:(100-500), and the molar ratio of the transition metal compound to the organomagnesium compound is 1:(10-2000), preferably 1:(100-1000). In addition, the molar ratio of the organoaluminum compound to the organomagnesium compound is preferably greater than 2.5:1.

[0087] According to the present invention, preferably, the concentration of the transition metal compound in the isotactic polymerization reaction system is 1×10 -10 mol / L~1×10 -3 mol / L, preferably 1×10 -8 mol / L~1×10 -5 mol / L.

[0088] According to the present invention, the amount of the α-olefin used can be the amount commonly used in the art for synthesizing isotactic α-olefin polymers. For example, the amount of the α-olefin added can be 1000-1000000 molar equivalents of the catalyst.

[0089] According to the present invention, preferably, the isotactic polymerization reaction is carried out in an inert organic solvent. The inert organic solvent may be a mixture of one or more of a straight-chain aliphatic hydrocarbon, a branched aliphatic hydrocarbon, a substituted or unsubstituted cyclic aliphatic hydrocarbon, a substituted or unsubstituted aromatic hydrocarbon. Specific examples of the inert organic solvent include: hexane, heptane, cyclohexane, cyclooctane, toluene, and xylene. In addition, the amount of the organic solvent may be determined according to the reaction activity to ensure that the produced polymer is well dissolved in the system, at least without affecting the dispersion.

[0090] According to the method of the present invention, the polymerization reaction conditions can be the common conditions used in the art for synthesizing isotactic poly(α-olefin). Preferably, the temperature of the isotactic polymerization reaction is -50 to 200°C, and the time of the isotactic polymerization reaction is 1 to 300 minutes; more preferably, the temperature of the isotactic polymerization reaction is -20 to 150°C, and the time of the isotactic polymerization reaction is 5 to 60 minutes.

[0091] According to the method of the present invention, when the α-olefin is a gas, preferably, the partial pressure of the α-olefin is 0.1-10 MPa, preferably 0.1-4.0 MPa.

[0092] According to the present invention, preferably, the α-olefin is a terminal olefin containing 3 to 18 carbon atoms, more preferably one or more of propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene. In addition, a comonomer may be optionally added during the polymerization, and the comonomer is a terminal olefin containing 3 to 18 carbon atoms, which is different from the above α-olefin.

[0093] According to a second aspect of the present invention, there is provided an α-olefin isotactic polymer prepared by the method for isotactic polymerization of α-olefins according to the first aspect of the present invention.

[0094] The present invention will be described in detail below by way of examples, but the present invention is not limited to the following examples.

[0095] The raw materials used in the following examples and comparative examples, unless otherwise specified, are all disclosed in the prior art, for example, they can be directly purchased or prepared according to the preparation method disclosed in the prior art.

[0096] Preparation Example 1

[0097] Synthesis of compound (1):

[0098]

[0099] Place the magnet in a dry 250 ml three-necked flask, and place the reaction flask on a device with magnetic stirring and oil bath heating. After evacuating the three-necked flask, rinse it repeatedly with nitrogen three times, add 470 mg of 10-hydroxybenzo[H]quinoline under nitrogen atmosphere, add 20 ml of toluene and stir at room temperature to dissolve; add 10 ml of toluene solution of tetra(isopropoxy)titanium (containing 342 mg of tetra(isopropoxy)titanium) and stir evenly. Then, under nitrogen protection, add a condenser with room temperature water as the cooling medium. Control the oil bath temperature at 115-130°C and allow the reaction to proceed for 8 hours under toluene reflux. Then remove the reflux condenser, install a distillation device, maintain the temperature, and evaporate the liquid of the reaction mixture until a yellow solid or viscous substance is obtained, and then cool it to room temperature. Under nitrogen protection, add 10 ml of cold hexane, mix thoroughly, and centrifuge the resulting slurry. Pour out the supernatant. Add 10 ml of cold hexane again, mix thoroughly, and centrifuge the resulting slurry. The supernatant was poured off, and the solvent of the obtained solid was removed under vacuum to obtain 641 mg of bright yellow solid with a molar yield of 96%.

[0100] 1H-NMR(in CDCl3,d=):9.09-9.11(2H),7.71-7.73(2H),7.52-7.56(2H),7.46-7.49 (2H),7.14-7.19(6H),6.89-6.92(2H),4.84-4.91(2H),1.07-1.19(12H).

[0101] 13 C-NMR (in CDCl3, d=): 161.3, 148.9, 143.7, 135.9, 134.5, 128.8, 127.9, 125.3, 123.3, 118.8, 118.5, 116.5, 115.4, 77.0, 24.3.

[0102] Preparation Example 2

[0103] Synthesis of compound (2):

[0104]

[0105] Place the magnet in a dry 250 ml three-necked flask, evacuate the flask and rinse it with nitrogen three times, add 500 mg of 10-hydroxybenzo[H]quinoline under nitrogen atmosphere, add 20 ml of toluene and stir at room temperature to dissolve, place the three-necked flask in a low-temperature magnetic stirring device, and stir at -20°C for 20 minutes. Take 1.1 ml of n-butyl lithium solution (2.5 mol / L hexane solution) and slowly add it dropwise. After the addition is complete, naturally warm to room temperature and stir to react overnight. Place the three-necked flask in a low-temperature magnetic stirring device and stir at -20°C for 20 minutes. Dissolve 243 mg of titanium tetrachloride in 10 ml of toluene at -20°C and slowly add it dropwise to the three-necked flask. After the addition is complete, naturally warm to room temperature and stir to react overnight. The obtained reaction slurry was filtered through diatomaceous earth, and the filter cake was washed with toluene. The obtained dark red solution was desolventized under vacuum to obtain a dark red solid. 10 ml of cold hexane was added, and after thorough mixing, the obtained slurry was centrifuged and the supernatant was poured out. 10 ml of cold hexane was added again, and after thorough mixing, the obtained slurry was centrifuged and the supernatant was poured out. The obtained solid was desolventized under vacuum to obtain 590 mg of a dark red solid with a molar yield of 91%.

[0106] The structure of the dark red solid was confirmed to be compound (2) by H-NMR and C-NMR.

[0107] Preparation Example 3

[0108] Synthesis of compound (3):

[0109]

[0110] Place the magnet in a dry 250 ml three-necked flask, evacuate the flask and rinse it with nitrogen three times, add 586 mg of 10-hydroxybenzo[H]quinoline under nitrogen atmosphere, add 20 ml of toluene and stir at room temperature to dissolve, place the three-necked flask in a low-temperature magnetic stirring device, and stir at -20°C for 20 minutes. Take 1.3 ml of n-butyl lithium solution (2.5 mol / L hexane solution) and slowly add it dropwise. After the addition is complete, warm to room temperature naturally and stir to react overnight. Place the three-necked flask in a low-temperature magnetic stirring device and stir at -20°C for 20 minutes. Under nitrogen protection, add 350 mg of zirconium tetrachloride solid to the three-necked flask three times, with an interval of 2 minutes each time. After completion, warm to room temperature naturally and stir to react overnight. The obtained reaction slurry was filtered through diatomaceous earth, and the filter cake was washed with toluene. The obtained red solution was freed of solvent under vacuum to obtain a red solid. 10 ml of cold hexane was added and mixed thoroughly. The obtained slurry was centrifuged and the supernatant was poured out. 10 ml of cold hexane was added again and mixed thoroughly. The obtained slurry was centrifuged and the supernatant was poured out. The obtained solid was freed of solvent under vacuum to obtain 675 mg of dark red solid with a molar yield of 82%.

[0111] The structure of the dark red solid was confirmed to be compound (3) by H-NMR and C-NMR.

[0112] Preparation Example 4

[0113] Synthesis of compound (4):

[0114]

[0115] Place the magnet in a dry 250 ml three-necked flask, and place the reaction flask on a device for magnetic stirring and oil bath heating. After evacuating the three-necked flask, rinse it repeatedly with nitrogen three times. Add 426 mg of 10-hydroxybenzo[H]quinoline, 296 mg of tetra(ethoxy)zirconium, and 20 ml of toluene under a nitrogen atmosphere, and stir evenly at room temperature. Then, under nitrogen protection, add a condenser with room temperature water as the cooling medium. Control the oil bath temperature at 115-130°C and allow the reaction to proceed under toluene reflux for 18 hours. Cool to room temperature, filter the solution, and remove the solvent in vacuum to obtain a light yellow solid or viscous material. Under nitrogen protection, add 10 ml of cold hexane, mix thoroughly, centrifuge the resulting slurry, pour out the supernatant, and remove the solvent from the resulting solid under vacuum to obtain 482 mg of a light yellow solid with a molar yield of 78%.

[0116] The structure of the light yellow solid was confirmed to be compound (4) by hydrogen and carbon nuclear magnetic spectra.

[0117] Preparation Example 5

[0118] Synthesis of compound (5):

[0119]

[0120] Place the magnet in a dry 250 ml three-necked flask, evacuate the flask and rinse it with nitrogen three times, add 575 mg of 10-hydroxybenzo[H]quinoline under nitrogen atmosphere, add 20 ml of toluene and stir at room temperature to dissolve, place the three-necked flask in a low-temperature magnetic stirring device, and stir at -20°C for 20 minutes. Take 1.3 ml of n-butyl lithium solution (2.5 mol / L hexane solution) and slowly add it dropwise. After the addition is complete, naturally warm to room temperature and stir to react overnight. Place the three-necked flask in a low-temperature magnetic stirring device and stir at -20°C for 20 minutes. Under nitrogen protection, add 470 mg of zirconium tetrachloride solid to the three-necked flask three times, with an interval of 2 minutes each time. After completion, naturally warm to room temperature and stir to react overnight. The obtained reaction slurry was filtered through diatomaceous earth, and the filter cake was washed with toluene. The obtained red solution was desolventized under vacuum to obtain a red solid. 10 ml of cold hexane was added and mixed thoroughly. The obtained slurry was centrifuged and the supernatant was poured out. 10 ml of cold hexane was added again and mixed thoroughly. The obtained slurry was centrifuged and the supernatant was poured out. The obtained solid was desolventized under vacuum to obtain 712 mg of dark red solid with a molar yield of 76%.

[0121] The structure of the dark red solid was confirmed to be compound (5) by H-NMR and C-NMR.

[0122] Example 1

[0123] Propylene polymerization using compound (1) as catalyst

[0124] A 250 ml glass polymerization bottle that has been fully dried is evacuated and flushed with nitrogen, and this process is repeated three times. Evacuate the bottle and fill it with propylene, with the propylene pressure being 1.05 standard atmospheric pressure. Add 22 ml of toluene and 5 ml of diethylaluminum chloride toluene solution (containing 5 mmol of diethylaluminum chloride) in sequence, start magnetic stirring and heating, and set the temperature to 70°C. When the temperature rises to 70°C, add 2 ml of catalyst toluene solution (containing 10 micromoles of compound (1)). After 3 minutes, add 1 ml of di-n-butylmagnesium toluene solution (containing 1 mmol of di-n-butylmagnesium). Start timing. When propylene is consumed, add propylene to keep the propylene pressure at a constant 1.05 standard atmospheric pressure. After 120 minutes, turn off the propylene, pour the reaction solution into a beaker, add 300 ml of anhydrous ethanol and 5 ml of concentrated hydrochloric acid, stir for 6 hours, filter to obtain a polymer, and vacuum dry at 60°C for 24 hours to obtain 0.31 g of a polymer. The polymerization activity is 15.5 kg polymer / mol catalyst / hour, and the melting point of the polymer is 161°C.

[0125] Example 2

[0126] Polymerization of 4-methyl-1-pentene using compound (1) as catalyst

[0127] A 250 ml glass polymerization bottle was fully dried, evacuated, and flushed with nitrogen, and repeated three times. Evacuated, flushed with nitrogen, and 10 ml of toluene, 5 ml of 4-methyl-1-pentene, and 2.5 ml of diethylaluminum chloride toluene solution (containing 2.5 mmol of diethylaluminum chloride) were added in sequence. Magnetic stirring and heating were started, and the temperature was set to 70°C. When the temperature rose to 70°C, 1 ml of catalyst toluene solution (containing 5 micromoles of compound (1)) was added. After 3 minutes, 0.5 ml of di-n-butylmagnesium toluene solution (containing 0.5 mmol of di-n-butylmagnesium) was added, and the timing was started. After 72 hours, the reaction solution was poured into a beaker, 300 ml of anhydrous ethanol and 5 ml of concentrated hydrochloric acid were added, and stirred for 6 hours. The polymer was filtered to obtain a polymer, and vacuum dried at 60°C for 24 hours to obtain 0.24 g of a polymer. The polymerization activity was 0.67 kg polymer / mol catalyst / hour, and the melting point of the polymer was 231°C.

[0128] Example 3

[0129] Polymerization of 4-methyl-1-pentene and 1-hexene using compound (1) as catalyst

[0130] A 250 ml glass polymerization bottle was fully dried, evacuated, and flushed with nitrogen, and repeated three times. Evacuated, flushed with nitrogen, and 10 ml of toluene, 4 ml of 4-methyl-1-pentene, 1 ml of 1-hexene, and 2.5 ml of diethylaluminum chloride toluene solution (containing 2.5 mmol of diethylaluminum chloride) were added in sequence. Magnetic stirring and heating were started, and the temperature was set to 70°C. When the temperature rose to 70°C, 1 ml of catalyst toluene solution (containing 5 micromoles of compound (1)) was added. After 3 minutes, 0.5 ml of di-n-butylmagnesium toluene solution (containing 0.5 mmol of di-n-butylmagnesium) was added, and the timing was started. After 72 hours, the reaction solution was poured into a beaker, 300 ml of anhydrous ethanol and 5 ml of concentrated hydrochloric acid were added, and stirred for 6 hours. The polymer was filtered to obtain a polymer, and vacuum dried at 60°C for 24 hours to obtain 0.37 g of a polymer. The polymerization activity was 1.03 kg of polymer / mol catalyst / hour, and the melting point of the polymer was 212°C.

[0131] Example 4

[0132] Propylene polymerization using compound (2) as catalyst

[0133] The method of Example 1 was followed, except that the compound (1) was replaced by the same molar amount of the compound (2), and polymer 0.35 was obtained in the same manner. The polymerization activity was 17.5 kg polymer / mol catalyst / hour, and the melting point of the polymer was 168°C.

[0134] Example 5

[0135] Propylene polymerization using compound (3) as catalyst

[0136] The method of Example 1 was followed, except that the compound (1) was replaced by the same molar amount of the compound (3), and 0.41 g of polymer was obtained in the same manner. The polymerization activity was 20.5 kg polymer / mol catalyst / hour, and the melting point of the polymer was 165°C.

[0137] Example 6

[0138] Propylene polymerization using compound (4) as catalyst

[0139] The method of Example 1 was followed, except that the compound (1) was replaced by the same molar amount of the compound (4), and 0.44 g of polymer was obtained in the same manner. The polymerization activity was 22 kg polymer / mol catalyst / hour, and the melting point of the polymer was 166°C.

[0140] Example 7

[0141] Propylene polymerization using compound (5) as catalyst

[0142] The method of Example 1 was followed, except that the compound (1) was replaced by the same molar amount of the compound (5), and polymer 0.47 was obtained in the same manner. The polymerization activity was 23.5 kg polymer / mol catalyst / hour, and the melting point of the polymer was 162°C.

[0143] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A method for isotactic polymerization of α-olefins, characterized in that The method comprises: using a catalyst composition to perform an isotactic polymerization reaction on α-olefins; Wherein, the catalyst composition comprises the following components: a) a transition metal compound having a structure represented by formula (1); b) a co-catalyst component, In formula (1), M is a tetravalent transition metal atom; X and Y are each independently a hydrocarbonoxy group having 1 to 10 carbon atoms or a halogen.

2. The method according to claim 1, wherein: M is a titanium atom, a zirconium atom or a hafnium atom, and is preferably a titanium atom or a zirconium atom.

3. The method according to claim 1, wherein: X and Y are each independently a hydrocarbonoxy group having 1 to 6 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom or an iodine atom; Preferably, X and Y are each independently a hydrocarbonoxy group having 1 to 3 carbon atoms or a chlorine atom; Preferably, the alkoxy group having 1 to 10 carbon atoms is methoxy, ethoxy, propoxy or isopropoxy.

4. The method according to any one of claims 1 to 3, wherein: X and Y are both isopropoxy or ethoxy; or, X and Y are both chlorine atoms.

5. The method according to any one of claims 1 to 3, wherein: The co-catalyst component comprises a combination of an organoaluminum compound and an organomagnesium compound; Preferably, the co-catalyst component is a combination of an organoaluminum compound and an organomagnesium compound.

6. The method according to claim 5, wherein: The organoaluminum compound is a compound having a structure represented by the general formula AlX1X2X3, wherein X1, X2 and X3 are respectively a halogen atom, an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, and an aryloxy group having 6 to 12 carbon atoms, and X1, X2 and X3 may be the same or different, and at least one of them is an alkyl group having 1 to 8 carbon atoms; Preferably, the organoaluminum compound is diethylaluminum chloride and / or dimethylaluminum chloride.

7. The method according to claim 5, wherein: The organomagnesium compound is an organomagnesium compound containing two alkyl groups with carbon atoms of 1 to 10, preferably an organomagnesium compound containing two alkyl groups with carbon atoms of 1 to 6, and more preferably di-n-butylmagnesium.

8. The method according to claim 5, wherein: The co-catalyst component is a combination of an organic aluminum compound and an organic magnesium compound, the molar ratio of the transition metal compound to the organic aluminum compound is 1: (30-5000), preferably 1: (100-1000), more preferably 1: (100-500), the molar ratio of the transition metal compound to the organic magnesium compound is 1: (10-2000), preferably 1: (100-1000).

9. The method according to claim 8, wherein: The molar ratio of the organoaluminum compound to the organomagnesium compound is greater than 2.5:

1.

10. The method according to any one of claims 1 to 3, wherein: The concentration of the transition metal compound in the isotactic polymerization reaction system is 1×10 -10 mol / L~1×10 -3 mol / L, preferably 1×10 -8 mol / L~1×10 -5 mol / L.

11. The method according to any one of claims 1 to 3, wherein: The temperature of the isotactic polymerization reaction is -50 to 200°C, and the time of the isotactic polymerization reaction is 1 to 300 minutes; Preferably, the temperature of the isotactic polymerization reaction is -20 to 150° C., and the time of the isotactic polymerization reaction is 5 to 60 minutes.

12. The method according to any one of claims 1 to 3, wherein: The α-olefin is a terminal olefin containing 3 to 18 carbon atoms, preferably one or more of propylene, 1-butene, 4-methyl-1-pentene, 1-hexene and 1-octene.

13. An isotactic α-olefin polymer prepared by the method for preparing an isotactic α-olefin polymer according to any one of claims 1 to 12.

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