CN109535286B - Early transition metal compound and preparation method thereof, catalyst composition for olefin polymerization and application thereof, and method for preparing olefin polymer - Google Patents
Early transition metal compound and preparation method thereof, catalyst composition for olefin polymerization and application thereof, and method for preparing olefin polymer Download PDFInfo
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- CN109535286B CN109535286B CN201710864791.6A CN201710864791A CN109535286B CN 109535286 B CN109535286 B CN 109535286B CN 201710864791 A CN201710864791 A CN 201710864791A CN 109535286 B CN109535286 B CN 109535286B
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Abstract
The invention relates to the field of catalysts, and discloses an early transition metal compound and a preparation method thereof, a catalyst composition for olefin polymerization and an application thereof, and a method for preparing an olefin polymer, wherein the compound has a structure shown in a formula (1) or a formula (2). The catalyst containing the nitrogen and phosphine-containing early transition metal compound provided by the invention has the advantages of high catalytic activity and low catalyst cost.
Description
Technical Field
The invention relates to the field of catalysts, in particular to a nitrogen and phosphine-containing early transition metal compound, a method for preparing the nitrogen and phosphine-containing early transition metal compound, the nitrogen and phosphine-containing early transition metal compound prepared by the method, a catalyst composition for olefin polymerization, application of the catalyst composition for olefin polymerization in catalyzing ethylene homopolymerization and/or ethylene-alpha olefin copolymerization and a method for preparing olefin polymer.
Background
Polyolefins are a widely used and very important class of polymeric materials, including homopolymers and copolymers of ethylene, alpha olefins. Polyolefins are important in the synthetic resin industry and are useful as films, pipes, wires and cables.
Advances in olefin polymerization catalyst technology are a direct driving force for advances in the polyolefin industry. The catalytic polymerization of olefins has been the focus of attention by researchers and manufacturers, from traditional Ziegler-Natta catalysts to single-site metallocene catalysts that appeared in the end of the 80 th century, to highly active "post-metallocene" and late transition metal catalysts at the end of the 20 th century.
The traditional Ziegler-Natta catalyst has the defects of low catalytic activity, wide molecular weight distribution and high residual catalyst content in a polymerization product obtained by solution polymerization. The discovery of group IV metallocene catalysts has better solved this problem by having a single site of activity, allowing one to obtain polymers of the desired structure by altering the structure of the catalyst as required (W.Kaminsky et al, adv.Organomet.Chem.1980, 18, 99; H.H.Brintzingger et al, Angew.Chem.int.Ed.Engl.1995, 34, 1143). In recent decades, a metal complex obtained by coordinating cyclopentadiene with a transition metal with a ligand containing a coordinating atom such as N, O, P has been actively studied as an olefin polymerization catalyst, and such a catalyst is collectively referred to as a "post-metallocene" catalyst.
Late transition metal (Fe, Co, Ni, Pd, etc.) catalysts can catalyze ethylene polymerization to obtain various polyethylene products, such as polyethylene with a highly linear to highly branched structure, polyethylene with a monomodal distribution to a broad or bimodal distribution, and copolymers of ethylene and polar monomers, polyolefin block copolymers, etc.
In 1998, Brookhart and Gibson reported that Fe, Co diimine pyridine complex (structure shown as following formula) has high activity for ethylene polymerization under the activation of cocatalyst Methylaluminoxane (MAO) to obtain linear High Density Polyethylene (HDPE). It has been found that iron catalytic systems are generally an order of magnitude more active than cobalt catalytic systems.
US5557023 discloses post-transition metal compounds containing a phosphinimine having the general structure:
US6762258B2 discloses phosphine and nitrogen containing tridentate ligands Fe, Co, Ni pyridine complexes having the structure shown below, and further, US6133387 discloses that the late transition metals Fe, Co, Ni, Pd of pyridine-containing bisphosphinemines, all used for the polymerization of olefins, but the activity of these two complexes to catalyze ethylene polymerization is only high under specific reaction conditions (e.g. high pressure), and thus the wide application of the catalyst is not facilitated:
the olefin polymerization catalysts provided by the prior art are all late transition metal complexes.
Disclosure of Invention
The object of the present invention is to provide a novel olefin polymerization catalyst for olefin homopolymerization or copolymerization, especially for ethylene homopolymerization and ethylene and alpha-olefin copolymerization, in order to obtain high density polyethylene and ethylene-alpha-olefin elastomer under flexible operating conditions.
The inventor of the present invention found in research that a group IVB metal pyridine complex containing phosphine and nitrogen (monodentate ligand) can be used as a catalyst for catalyzing ethylene homopolymerization and ethylene copolymerization with alpha olefin, and can obtain high density polyethylene or ethylene-alpha olefin elastomer under a wide range of polymerization conditions with high activity. That is, when used as a catalyst for ethylene homopolymerization and ethylene copolymerization, the group IVB metal pyridine complex containing phosphine and nitrogen (monodentate ligand) has significantly higher catalytic activity under various polymerization conditions (even under low reaction pressure) than the group VIII metal pyridine complex containing phosphine and nitrogen bidentate ligand or tridentate ligand. Accordingly, the inventors have completed the technical solution of the present invention.
In order to achieve the above object, a first aspect of the present invention provides a nitrogen-and phosphine-containing early transition metal compound having a structure represented by formula (1) or formula (2),
wherein, in the formula (1) and the formula (2),
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-20A hydrocarbon group of1-20Alkoxy and halogen of (a);
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-4A hydrocarbon group of6-12And aryl of (A) and1-4is substituted with a hydrocarbon group of7-16A group of the group consisting of aryl groups of (a);
mt is a group IVB metal element;
x is an atom or group bonded to Mt, X is selected from the group consisting of1-10At least one group of the group consisting of hydrocarbyl and halogen; n is an integer and satisfies the valence of the Mt bond.
In a second aspect, the present invention provides a method for preparing a nitrogen-and phosphine-containing early transition metal compound having a structure represented by formula (1),
the method comprises the following steps:
1) carrying out a first reaction on a compound shown as a formula (13) and n-BuLi in the presence of an organic solvent to obtain a first lithium salt;
2) performing a second reaction of the first lithium salt with a compound represented by formula (11);
3) carrying out a third reaction on the product obtained in the step 2) and trimethyl azido silane to obtain an intermediate of the compound shown in the formula (14);
4) the intermediate obtained in the step 3) is mixed with MtX(n+1)Carrying out a fourth reaction;
wherein the substituents in formula (1), formula (11), formula (13) and formula (14) are as defined in the foregoing first aspect, and X in formula (13)1Is halogen, X2Is R in formula (1)4。
In a third aspect, the present invention provides a method for preparing a nitrogen-and phosphine-containing early transition metal compound having a structure represented by formula (2),
the method comprises the following steps:
1) carrying out a first reaction on the compounds shown in the formulas (11) and (12) and n-BuLi in the presence of an organic solvent to obtain a first lithium salt;
2) performing a second reaction of the first lithium salt with a compound represented by formula (13);
3) carrying out a third reaction on the product obtained in the step 2) and trimethyl azido silane to obtain an intermediate of the compound shown in the formula (15);
4) will be provided withThe intermediate obtained in step 3) and MtX(n+1)Carrying out a fourth reaction;
wherein the substituents in formula (2), formula (11), formula (12), formula (13) and formula (15) are as defined in the foregoing first aspect, and X in formula (13) is1And X2Each independently is halogen.
In a fourth aspect, the present invention provides nitrogen and phosphine containing early transition metal compounds prepared by the methods of the second and third aspects described above.
In a fifth aspect, the present invention provides a catalyst composition for olefin polymerisation comprising a procatalyst which is a nitrogen and phosphine containing early transition metal compound according to the first and/or fourth aspects of the invention and an activator comprising an aluminium containing compound and optionally an organoboron compound.
In a sixth aspect, the present invention provides a use of the catalyst composition for olefin polymerization according to the fifth aspect for catalyzing ethylene homopolymerization and/or ethylene- α -olefin copolymerization.
In a seventh aspect, the present invention provides a process for producing an olefin polymer, the process comprising: an olefin monomer is subjected to a contact reaction with the catalyst composition for olefin polymerization according to the fifth aspect of the present invention in the presence of a solvent.
The catalyst containing the pre-transition metal compound containing phosphine and nitrogen (monodentate ligand) provided by the invention has the advantages of high catalytic activity and low catalyst cost, and has excellent catalytic activity under a wide range of polymerization reaction conditions.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
As described above, the present inventionFirst aspectThere is provided a nitrogen-and phosphine-containing early transition metal compound having a structure represented by formula (1) or formula (2),
wherein, in the formula (1) and the formula (2),
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-20A hydrocarbon group of1-20Alkoxy and halogen of (a);
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-4A hydrocarbon group of6-12And aryl of (A) and1-4is substituted with a hydrocarbon group of7-16A group of the group consisting of aryl groups of (a);
mt is a group IVB metal element;
x is an atom or group bonded to Mt, X is selected from the group consisting of1-10At least one group of the group consisting of hydrocarbyl and halogen; n is an integer and satisfies the valence of the Mt bond.
The halogen of the present invention includes fluorine, chlorine, bromine and iodine.
The n X's of the present invention may be the same or different.
Said C is1-20The hydrocarbon group (C) means a hydrocarbon group having 1 to 20 carbon atoms in total, and may be, for example, C1、C2、C3、C4、C5、C6、C7、C8、C9、C10、C11、C12、C13、C14、C15、C16、C17、C18、C19Or C20A hydrocarbon group of (1). For example, the C1-20The hydrocarbon group of (A) may be C1-20Alkyl or C2-20Alkenyl groups of (a).
Said C is1-20The alkoxy group (b) means an alkoxy group having 1 to 20 carbon atoms in total, and may be, for exampleC1、C2、C3、C4、C5、C6、C7、C8、C9、C10、C11、C12、C13、C14、C15、C16、C17、C18、C19Or C20Alkoxy group of (2).
Said C is1-4The hydrocarbon group (C) means a hydrocarbon group having 1 to 4 carbon atoms in total, and may be, for example, C1、C2、C3Or C4A hydrocarbon group of (1). For example, may be C1-4Alkyl or C2-4Alkenyl groups of (a).
Said C is6-12The aryl group of (1) means an aryl group having 6 to 12 carbon atoms in total, and may be, for example, a phenyl group, a naphthyl group or a biphenyl group.
The compound is composed of1-4Is substituted with a hydrocarbon group of7-16The aryl group of (a) means an aryl group having 7 to 16 carbon atoms in total, and at least one H on the aryl group is substituted by C1-4May be substituted by C1-4A hydrocarbyl-substituted phenyl, naphthyl, biphenyl, anthracenyl or phenanthrenyl group. For example, may be composed of C1-4Alkyl and/or C2-4Alkenyl-substituted C of7-16Aryl group of (1).
The IVB group metal element is Ti, Zr or Hf.
According to a first preferred embodiment, in formula (1) and formula (2),
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-16A hydrocarbon group of1-16Alkoxy and halogen of (a);
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-4A hydrocarbon group of6-10And aryl of (A) and1-4is substituted with a hydrocarbon group of7-14A group of the group consisting of aryl groups of (a);
mt is Ti, Zr or Hf;
x is selected from C1-8At least one group of the group consisting of hydrocarbon group, fluorine, chlorine, bromine and iodine.
According to a second preferred embodiment, in the formulae (1) and (2),
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-10A hydrocarbon group of1-10Alkoxy and halogen of (a);
R1、R2、R3and R4Each independently selected from the group consisting of H, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, phenyl, naphthyl and C substituted with at least one substituent selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl and tert-butyl7-14A group of the group consisting of aryl groups of (a);
mt is Ti, Zr or Hf;
x is at least one group selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, cyclopentadiene, fluorine, chlorine, bromine, and iodine.
According to a third preferred embodiment, in formula (1) and formula (2),
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-6Alkyl of (C)1-6Alkoxy and halogen of (a);
R1、R2、R3and R4Each independently selected from phenyl, naphthyl and C substituted by at least one substituent of methyl, ethyl, n-propyl, isopropyl, n-butyl and tert-butyl7-14At least one group of aryl groups of (a);
mt is Ti, Zr or Hf;
n X are all halogen, or one of n X is cyclopentadiene and the rest (n-1) X are halogen.
In the present invention, n is preferably 2 or 3.
The nitrogen and phosphine containing early transition metal compounds provided by the first aspect of the invention have the advantages of high catalytic activity and suitability for preparing high density polyethylene and ethylene-alpha olefin elastomers when used in the polymerization of catalytic olefins with activators to form catalysts.
As described above, the present inventionSecond aspect of the inventionThere is provided a process for producing a nitrogen and phosphine-containing early transition metal compound having a structure represented by formula (1),
the method comprises the following steps:
1) carrying out a first reaction on a compound shown as a formula (13) and n-BuLi in the presence of an organic solvent to obtain a first lithium salt;
2) performing a second reaction of the first lithium salt with a compound represented by formula (11);
3) carrying out a third reaction on the product obtained in the step 2) and trimethyl azido silane to obtain an intermediate of the compound shown in the formula (14);
4) the intermediate obtained in the step 3) is mixed with MtX(n+1)Carrying out a fourth reaction;
wherein the substituents in formula (1), formula (11), formula (13) and formula (14) are as defined in the foregoing first aspect, and X in formula (13)1Is halogen, X2Is R in formula (1)4。
As described above, the present inventionThird aspect of the inventionThere is provided a method for preparing a nitrogen and phosphine-containing early transition metal compound having a structure represented by formula (2),
the method comprises the following steps:
1) carrying out a first reaction on the compounds shown in the formulas (11) and (12) and n-BuLi in the presence of an organic solvent to obtain a first lithium salt;
2) performing a second reaction of the first lithium salt with a compound represented by formula (13);
3) carrying out a third reaction on the product obtained in the step 2) and trimethyl azido silane to obtain an intermediate of the compound shown in the formula (15);
4) the intermediate obtained in the step 3) is mixed with MtX(n+1)Carrying out a fourth reaction;
wherein the substituents in formula (2), formula (11), formula (12), formula (13) and formula (15) are as defined in the foregoing first aspect, and X in formula (13) is1And X2Each independently is halogen.
In the second and third aspects of the present invention, the conditions of the first, second, third and fourth reactions may each independently comprise: the reaction temperature is 80 ℃ below zero to 200 ℃ above zero, and the reaction time is 0.1-30 h.
In the second and third aspects of the present invention, preferably, in the step 1), the organic solvent is at least one selected from the group consisting of toluene, hexane, pentane, benzene, xylene, dichloromethane, chloroform, tetrachloromethane and tetrahydrofuran.
In the third aspect of the present invention, preferably, the step 1) may be performed, for example, by a method including the steps of: dissolving compounds shown in formula (11) and formula (12) in an organic solvent to form a solution A; then, the solution B containing n-BuLi is mixed and contacted with the solution A to carry out the first reaction.
The organic solvent contained in the solution A is preferably at least one of toluene, pentane, benzene, xylene, dichloromethane, trichloromethane, tetrachloromethane and tetrahydrofuran; the solvent in the solution B is preferably at least one of hexane, pentane, benzene, xylene, dichloromethane, chloroform, tetrachloromethane, and tetrahydrofuran.
In the second and third aspects of the present invention, the first lithium salt obtained after the first reaction of the present invention may be directly introduced into step 2) for reaction, or may be separated and purified, and then introduced into step 2) for reaction. The step of separation and purification in the present invention is not particularly limited, and those skilled in the art can perform separation and purification by using a method conventionally used in the art, such as recrystallization, column chromatography, and the like.
In the third aspect of the present invention, the molar ratio of the total amount of the main raw materials formed from the compounds represented by formula (11) and formula (12) to the amount of n-BuLi used is preferably 1: (0.5 to 1.5).
In the third aspect of the present invention, it is preferable that the first lithium salt and the compound represented by formula (13) are used in a molar ratio of 1: (0.1-1.2).
Preferably, in the second and third aspects of the present invention, the molar ratio of the product obtained in step 2) to the amount of the trimethylazidosilane is 1: (0.8-2).
Preferably, in step 4), the conditions of the fourth reaction include: the reaction temperature is 50-200 ℃, and the reaction time is 2-30 h. Preferably, the intermediate obtained in step 3) is reacted with said MtX(n+1)The molar ratio of the used amount of the compound is 1: (1-2).
The aforementioned steps of the method of the present invention may further include necessary post-treatment steps, and those skilled in the art may perform post-treatment using various steps conventionally used in the art to purify the crude product of each step. For example, the post-treatment step may include a solvent removal treatment, a washing treatment, a drying treatment, and the like.
As described above, the present inventionFourth aspect of the inventionThere is provided a nitrogen and phosphine containing early transition metal compound prepared by the foregoing process.
The nitrogen and phosphine-containing early transition metal compound according to the fourth aspect of the present invention has the same advantageous effects as the nitrogen and phosphine-containing early transition metal compound according to the first aspect of the present invention.
As described above, the present inventionFifth aspect of the inventionThere is provided a catalyst composition for olefin polymerisation comprising a procatalyst which is a nitrogen and phosphine containing early transition metal compound according to the first and/or fourth aspect of the invention and an activator comprising an aluminium containing compound and optionally an organoboron compound.
According to a first preferred embodiment, the activator is an aluminium-containing compound, the molar ratio of the content of the procatalyst in terms of metal elements to the aluminium-containing compound in terms of aluminium elements being from 1: (0.1 to 3000), more preferably 1: (50-1000).
According to a second preferred embodiment, the activator is an aluminum-containing compound and an organoboron compound, and the molar ratio of the contents of the main catalyst in terms of metal elements, the aluminum-containing compound in terms of aluminum elements and the organoboron compound in terms of boron elements is 1: (5-500): (1-5), preferably 1: (5-200): (1-5).
Preferably, the aluminum-containing compound is a mixture of an alkylaluminum compound and an alkylaluminoxane compound or an alkylaluminoxane compound.
Preferably, in the mixture of the alkylaluminum compound and the alkylaluminoxane compound, the molar ratio of the content of the alkylaluminum compound in terms of aluminum element to the content of the alkylaluminoxane compound in terms of aluminum element is 1: (10-500); more preferably 1: (25-300).
Preferably, the alkylaluminoxane compound has a structure represented by formula (3),
wherein R is31At least one group selected from methyl, ethyl, n-propyl, isopropyl, primary butyl, sec-butyl, and tert-butyl; t is an integer of 5 to 30. More preferably, in formula (3), R31Is at least one group selected from the group consisting of methyl, ethyl, n-propyl, isopropyl and tert-butyl. Further preferably, in formula (3), R31Is at least one group selected from the group consisting of methyl, ethyl and isopropyl. Particularly preferably, the alkylaluminoxane compound is Methylaluminoxane (MAO) and/or isobutylaluminoxane, i.e., R31Is methyl or isobutyl.
Preferably, the alkylaluminum compound is selected from at least one of trimethylaluminum, triethylaluminum, tripropylaluminum, triisobutylaluminum, trihexylaluminum, dimethylaluminum chloride, diethylaluminum chloride, dipropylaluminum chloride, diisobutylaluminum chloride, dihexylaluminum chloride, methylaluminum dichloride, ethylaluminum dichloride, propylaluminum dichloride, isobutylaluminum dichloride, hexylaluminum dichloride, dimethylaluminum hydride, diethylaluminum hydride, dipropylaluminum hydride, diisobutylaluminum hydride and dihexylaluminum hydride. Particularly preferably, the alkyl aluminum compound is triisobutylaluminum.
Preferably, the organoboron compound is selected from tris (pentafluorophenyl) boron (B (C)6F5)3) N, N-dimethylanilinium tetrakis (pentafluorophenyl) borate ([ HNMe)2Ph][B(C6F5)4]) And triphenylcarbenium tetrakis (pentafluorophenyl) borate ([ Ph)3C][B(C6F5)4]) At least one of (1).
The catalyst composition for olefin polymerization of the present invention may further contain other necessary additives as long as the additives do not affect the catalytic effect of the composition. For example, the composition may contain an impurity scavenger.
The fifth aspect of the present invention provides a catalyst having excellent catalytic activity in catalyzing olefin polymerization and being suitable for the preparation of high density polyethylene and ethylene-alpha olefin elastomer.
As described above, the present inventionSixth aspectThere is provided a use of the catalyst composition for olefin polymerization according to the fifth aspect for catalyzing ethylene homopolymerization and/or ethylene-alpha olefin copolymerization.
In this application of the present invention, the order of addition and the method of addition of the components forming the catalyst composition for olefin polymerization are not particularly limited, and the procatalyst, the activator and the optionally contained additive may be mixed in advance and then added to the polymerization reaction, or the procatalyst, the activator and the optionally contained additive may be added separately to the polymerization reaction. According to a preferred embodiment: the activator and the additive which is optionally contained are added into the reaction system, then the olefin monomer is introduced, and then the main catalyst is added.
As described above, the present inventionSeventh aspectThere is provided a process for producing an olefin polymer, the process comprising: reacting an olefin monomer with the present invention in the presence of a solventThe catalyst composition for olefin polymerization according to the fourth aspect is subjected to a contact reaction.
Preferably, the conditions of the contact reaction include: the temperature is 50 ℃ below zero to 200 ℃ above zero, the time is 0.1 to 6 hours, and the pressure is 0.1 to 5 MPa; more preferably, the conditions of the contact reaction include: the temperature is 20-100 ℃, the time is 0.2-5 h, and the pressure is 0.1-2 MPa. At which pressure is gauge pressure.
The contact reaction of the present invention may be carried out by solution polymerization or bulk polymerization. The polymerization reaction of the present invention may be a solution polymerization reaction, and it is obvious to those skilled in the art that the solvent used therein should be liquid under the homopolymerization conditions and not participate in the polymerization reaction nor react with the polymer obtained by the reaction, i.e., the solvent is inert. Such solvents will be readily apparent to those of ordinary skill in the polymerization art and can be readily selected. Nevertheless, for the present invention, specific examples of the organic solvent may be, for example, one or more of benzene, toluene, ethylbenzene, xylene, pentane, n-hexane, heptane, octane and cyclohexane, preferably n-hexane, octane or heptane, and more preferably n-hexane is used as the solvent in the homopolymerization reaction of the present invention. For the polymerization reaction of the present invention, the solvent is used in an amount such that the concentration of the polymer is in the range of 5 to 30% by weight, preferably 8 to 10% by weight.
According to the present invention, the above polymerization process is preferably carried out under protection of an inert atmosphere, for example, one or more of nitrogen, helium, argon, etc. may be used to provide such an inert atmosphere.
In the polymerization reaction of the present invention, a terminator may be used to terminate the polymerization reaction after the completion of the polymerization reaction. The terminating agents used for this step are conventional to those skilled in the art. Commonly used terminating agents include deionized water, alcohols, acids, and the like. In the present invention, the terminator to be preferably used is one or more of isopropyl alcohol, methanol, water and the like.
Preferably, the olefin monomer is ethylene and/or an alpha-olefin. Preferably, the α -olefin is at least one of propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, cyclopentene, cyclohexene, norbornene, 1-methylnorbornene, 5-methylnorbornene, dicyclopentadiene, 5-methylene-2-norbornene and 5-ethylidene-2-norbornene.
In particular, the olefin polymerization reaction catalyzed by the aforementioned catalyst of the present invention can achieve high catalytic efficiency while obtaining an ethylene-alpha olefin elastomer. The method for preparing the ethylene-alpha olefin copolymer has simple operation and lower catalyst cost.
More specifically, the above-mentioned preparation method can produce ethylene-propylene copolymer with higher catalytic efficiency, for example, the catalytic efficiency can reach 10, in the case of using the composition of the present invention as a catalyst6g polymer/mol metal. h.
The present invention will be described in detail below by way of examples.
In the following preparation examples, examples and comparative examples, various raw materials used were commercially available without specific description.
The weight average molecular weight and molecular weight distribution index (PDI ═ Mw/Mn) of the polymers described below were determined by means of Waters150 Gel Permeation Chromatography (GPC) and at 135 ℃ with 1,2, 4-trichlorobenzene as the mobile phase.
Catalytic efficiency refers to the mass of polymer obtained per molar amount of Mt, expressed in units of g polymer/mol metal.
Preparation example 1: preparation of ligand of formula (A1), 2- (diphenylphosphino) pyridine
1) Diluting 2-bromopyridine (0.01mol) in hexane (100mL), and dropwise adding n-BuLi (6.25mL) hexane solution at-78 ℃ to react for 1 h;
2) at 25 ℃, diphenylphosphine (0.01mmol) is dissolved in 20mL of toluene, the solution is slowly heated to 25 ℃, and the reaction is continued for 2h to obtain the ligand shown as the formula (A1).
The yield is 83 percent;1H NMR(400MHz,C6D6)δ:8.50(d,J＝4.6Hz,1H,py),7.52(t,J＝7.2Hz,4H,o-PPh2),7.10–6.94(m,7H,m-PPh2,p-PPh2,py),6.85(t,J＝7.6Hz,1H,py),6.48(t,J＝6.0Hz,1H,py)
preparation example 2: preparation of ligand, 2- (Ph), of formula (A2)2P ═ NTMS) pyridine
Reacting trimethyl azide silane N3SiMe3(0.02mol) was slowly added to a solution of 2- (diphenylphosphino) pyridine (0.01mol) and 20mL of toluene, and the reaction mixture was heated under reflux for 12 h. When the vacuum is applied to remove the solvent and the excess TMSN3Then, a white solid, i.e., the ligand represented by (A2), was obtained.
The yield is 96 percent;1H NMR(400MHz,C6D6)δ:8.38(m,1H,py),8.28(m,1H,py),7.98–7.87(m,4H,o-PPh2),7.04–6.95(m,8H,m-PPh2,p-PPh2,py),6.45-6.41(m,1H,py),0.34(s,9H,-SiMe3)。
preparation example 3: preparation of a Compound represented by the formula (1A)
The ligand (5mmol) represented by the formula (A2) prepared in preparation example 2 was dissolved in 10mL of toluene, stirred well, added with 5mL of toluene solution containing cyclopentadienyl titanium trichloride (5mmol), heated to 110 deg.C, reacted for 12h, and then cooled to 25 deg.C.
Preparation example 4: preparation of the ligand of formula (B1)
1) To a stirred solution of diphenylphosphine (PHPh) in THF (100mL) at-78 deg.C2) (0.02mol) was added n-BuLi (12.5mL of 1.6M n-hexane solution) to give a deep red solution, which was stirred at 25 ℃ for 8 h;
2) then, 20mL of a THF solution of 2, 6-dibromopyridine (0.01mol) was added dropwise to the above solution, and the mixture was stirred for 8 hours, followed by removal of the solvent by vacuum suction to obtain a ligand represented by the formula (B1).
The yield is 78 percent;1H NMR(400MHz,C6D6)δ:7.44(m,8H,o-PPh2),7.02(m,12H,m-PPh2,p-PPh2),6.94(d,J＝8.4Hz,2H,py),6.73(m,1H,py)。
preparation example 5: preparation of the ligand of formula (B2)
Reacting trimethyl azide silane N3SiMe3(0.02mol) was slowly added to a solution of 2, 6-bis (diphenylphosphino) pyridine (0.01mol) and 20mL of toluene, and the reaction mixture was heated under reflux for 12 h. When the vacuum is applied to remove the solvent and the excess TMSN3Then, a white solid, i.e., the ligand represented by formula (B2), was obtained.
The yield is 86%;1H NMR(400MHz,CDCl3)δ:8.45-8.37(m,2H,py),8.05-7.97(m,1H,py),7.51–7.43(m,12H,m-PPh2,p-PPh2),7.27–7.22(m,8H,o-PPh2),0.01(s,18H,-SiMe3).
preparation example 6: preparation of the Compound represented by the formula (1B)
The ligand (5mmol) represented by the formula (B2) prepared in preparation example 5 was dissolved in 10mL of toluene, stirred well, added with 5mL of toluene solution containing cyclopentadienyl titanium trichloride (10mmol), heated to 110 deg.C, reacted for 12h, and then cooled to 25 deg.C.
Preparation example 7: preparation of a Compound represented by the formula (2A)
The ligand (5mmol) represented by the formula (A2) prepared in preparation example 2 was dissolved in 10mL of toluene, stirred well, added with 5mL of toluene solution containing titanium trichloride (5mmol), heated to 100 deg.C, reacted for 15h, and then cooled to 25 deg.C.
Preparation example 8: preparation of the Compound represented by the formula (2B)
The ligand (5mmol) represented by the formula (B2) prepared in preparation example 5 was dissolved in 10mL of toluene, stirred well, added with 5mL of toluene solution containing titanium trichloride (10mmol), heated to 120 ℃, reacted for 10h, and then cooled to 25 ℃.
The compound represented by the formula (3A), the compound represented by the formula (3B), the compound represented by the formula (4A) and the compound represented by the formula (4B) were prepared in a similar manner to the above preparation examples, except that the kinds of the raw materials were different.
Example 1: ethylene propylene copolymerization (MAO as activator)
2mL of MAO in toluene (purchased from Albemarle, hereinafter; the same applies; the amount of MAO in toluene is such that the Al content is 10. mu. mol/mL) was added to 150mL of toluene under a nitrogen blanket and at 50 ℃ and an ethylene/propylene/hydrogen mixed gas (molar ratio 1: 1.5: 0.05, volume flow rate 50L/h) was continuously introduced while maintaining a gauge pressure of 0.6MPa, then the compound represented by the formula (1A) (0.03mmol) was added and polymerized for 15min, and the supply of monomers was stopped. The reaction was terminated with isopropanol and an antioxidant such as lrganox 1520 (in an amount such that the content of antioxidant in the polymer was 0.2% by weight, available from BASF corporation, the same below) was added. The resulting polymer was freed of the solvent and oven dried.
The results are shown in table 1.
Example 2: ethylene propylene copolymerization (MAO and organoboron Compounds as activators)
To 150mL of toluene was added 0.5mL of MAO in toluene (obtained from Albemarle, hereinafter, the same; the amount of MAO in toluene was such that the Al content was 10. mu. mol/mL) under nitrogen protection at 70 ℃ and an ethylene/propylene/hydrogen mixture gas (molar ratio: 1: 1.5: 0.01; volume flow: 50L/h) was continuously introduced while maintaining the gauge pressure at 0.6MPa, and [ CPh ] was added3][B(C6F5)4]Compound cocatalyst B/Ti 1/1 (molar ratio) (dissolved in toluene solution), and then the compound represented by formula (1B) (0.02mmol) was added, and polymerization was carried out for 15min, and supply of the monomer was stopped. The reaction was terminated with isopropanol and an antioxidant such as lrganox 1520 was added (in an amount such that the content of the antioxidant in the polymer was 0.2 wt%). The resulting polymer was freed of the solvent and oven dried.
The results are shown in table 1.
Example 3: ethylene homopolymerization (MAO and organoboron Compounds as activators)
0.5mL of MAO in toluene (obtained from Albemarle, hereinafter; the amount of MAO in toluene was such that the Al content was 10. mu. mol/mL) was added to 150mL of toluene under nitrogen at 50 ℃ while keeping the gauge pressure at 0.6MPa, and CPh was added3][B(C6F5)4]Compound cocatalyst B/Ti 1/1 (molar ratio) (dissolved in toluene solution), and then the compound represented by formula (2A) (0.02mmol) was added, and polymerization was carried out for 15min, and supply of the monomer was stopped. The reaction was terminated with isopropanol, the resulting polymer was freed of solvent and oven dried.
The results are shown in table 1.
Example 4: ethylene homopolymerization (MAO as activator)
2mL of MAO in toluene (purchased from Albemarle, hereinafter; the same applies; the amount of MAO in toluene was such that the Al content was 10. mu. mol/mL) was added to 150mL of toluene under a nitrogen blanket at 50 ℃ and ethylene gas was continuously fed at a volume flow rate of 50L/h while maintaining the gauge pressure at 0.6MPa, and then the compound represented by the formula (2B) (0.03mmol) was added thereto and polymerized for 15min, and the supply of the monomers was stopped. The reaction was terminated with isopropanol, the resulting polymer was freed of solvent and oven dried.
The results are shown in table 1.
Example 5: ethylene propylene copolymerization (MAO as activator)
This example was carried out in a similar manner to example 1, except that the compound represented by the formula (1A) in example 1 was replaced with an equal amount of the compound represented by the formula (2A).
The rest is the same as in example 1.
The results are shown in table 1.
Example 6: ethylene propylene copolymerization (MAO and organoboron Compounds as activators)
This example was carried out in a similar manner to example 2, except that the compound represented by the formula (1B) in example 2 was replaced with an equal amount of the compound represented by the formula (2B).
The rest is the same as in example 2.
The results are shown in table 1.
Example 7
This example was carried out in a similar manner to example 3, except that the compound represented by the formula (2A) in example 3 was replaced with an equivalent amount of the compound represented by the formula (3A).
The rest is the same as in example 3.
The results are shown in table 1.
Example 8
This example was carried out in a similar manner to example 4, except that the compound represented by the formula (2B) in example 4 was replaced with an equivalent amount of the compound represented by the formula (3B).
The rest is the same as in example 4.
The results are shown in table 1.
Example 9
This example was carried out in a similar manner to example 3, except that the compound represented by the formula (2A) in example 3 was replaced with an equivalent amount of the compound represented by the formula (4A).
The rest is the same as in example 3.
The results are shown in table 1.
Example 10
This example was carried out in a similar manner to example 4, except that the compound represented by the formula (2B) in example 4 was replaced with an equal amount of the compound represented by the formula (4B).
The rest is the same as in example 4.
The results are shown in table 1.
Comparative example 1
This comparative example was conducted in a similar manner to example 1 except that it used an equivalent amount of the complex disclosed in example 21 of US6133387 (hereinafter, named as complex 21) in place of the compound represented by the formula (1A) in example 1.
The rest is the same as in example 1.
The results are shown in table 1.
Comparative example 2
This comparative example was carried out in a similar manner to example 3, except that it used an equivalent amount of complex 21 (the complex disclosed in example 21 of US 6133387) instead of the compound of formula (2A) in example 3.
The rest is the same as in example 3.
The results are shown in table 1.
TABLE 1
| Catalyst and process for preparing same | Polymerization Activity/. times.105g polymer/mol metal. h | Mw/×104 | Tg/℃ | Tm/℃ | |
| Example 1 | 1A | 9.8 | 22.1 | -47 | - |
| Example 2 | 1B | 22.5 | 23.4 | -45 | - |
| Example 3 | 2A | 10.2 | 52.3 | - | 135.1 |
| Example 4 | 2B | 8.4 | 50.03 | - | 136 |
| Example 5 | 2A | 9.5 | 18.6 | -46 | - |
| Example 6 | 2B | 9.2 | 20.3 | -45 | - |
| Example 7 | 3A | 9.1 | 56.1 | - | 134 |
| Example 8 | 3B | 9.5 | 55.7 | - | 136 |
| Example 9 | 4A | 10.0 | 65.3 | - | 137.2 |
| Example 10 | 4B | 9.6 | 57.6 | - | 135.5 |
| Comparative example 1 | Complex 21 | 3.2 | 29.6 | - | 112.3 |
| Comparative example 2 | Complex 21 | 2.7 | 35.4 | - | 131.6 |
As can be seen from the results in table 1, the catalyst provided by the present invention can obtain ethylene homopolymer and ethylene- α -olefin copolymerized elastomer with high catalytic activity in a wide range, and particularly, the catalyst provided by the present invention has high catalytic activity even at low reaction pressure.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (19)
1. A nitrogen-and phosphine-containing early transition metal compound having a structure represented by the formula (1),
wherein, in the formula (1),
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-20A hydrocarbon group of1-20Alkoxy and halogen of (a);
R1、R2each independently selected from the group consisting of H, C1-4A hydrocarbon group of6-12And aryl of (A) and1-4is substituted with a hydrocarbon group of7-16A group of the group consisting of aryl groups of (a);
mt is a group IVB metal element;
x is an atom or group bonded to Mt, X is selected from the group consisting of1-10At least one group of the group consisting of hydrocarbyl and halogen; n is an integer and satisfies the valence of the Mt bond.
2. The compound according to claim 1, wherein, in formula (1),
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-16A hydrocarbon group of1-16Alkoxy and halogen of (a);
R1、R2each independently selected from the group consisting of H, C1-4A hydrocarbon group of6-10Aryl of (A) andfrom C1-4Is substituted with a hydrocarbon group of7-14A group of the group consisting of aryl groups of (a);
mt is Ti, Zr or Hf;
x is selected from C1-8At least one group of the group consisting of hydrocarbon group, fluorine, chlorine, bromine and iodine.
3. The compound according to claim 2, wherein, in formula (1),
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-10A hydrocarbon group of1-10Alkoxy and halogen of (a);
R1、R2each independently selected from the group consisting of H, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, phenyl, naphthyl and C substituted with at least one substituent selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl and tert-butyl7-14A group of the group consisting of aryl groups of (a);
mt is Ti, Zr or Hf;
x is at least one group selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, cyclopentadiene, fluorine, chlorine, bromine, and iodine.
4. The compound according to claim 3, wherein, in formula (1),
R1、R2、R3and R4Each independently selected from the group consisting of H, C1-6Alkyl of (C)1-6Alkoxy and halogen of (a);
R1、R2each independently selected from phenyl, naphthyl and C substituted by at least one substituent of methyl, ethyl, n-propyl, isopropyl, n-butyl and tert-butyl7-14At least one group of aryl groups of (a);
mt is Ti, Zr or Hf;
n X are all halogen, or one of n X is cyclopentadiene and the rest (n-1) X are halogen.
5. A process for producing a nitrogen-and phosphine-containing early transition metal compound having a structure represented by the formula (1),
the method comprises the following steps:
1) carrying out a first reaction on a compound shown as a formula (13) and n-BuLi in the presence of an organic solvent to obtain a first lithium salt;
2) performing a second reaction of the first lithium salt with a compound represented by formula (11);
3) carrying out a third reaction on the product obtained in the step 2) and trimethyl azido silane to obtain an intermediate of the compound shown in the formula (14);
4) the intermediate obtained in the step 3) is mixed with MtX(n+1)Carrying out a fourth reaction;
wherein the substituents in formula (1), formula (11), formula (13) and formula (14) are as defined in the preceding claim 1 or 2, and X in formula (13)1Is halogen, X2Is R in formula (1)4。
6. The method according to claim 5, wherein, in step 1), the organic solvent is selected from at least one of toluene, hexane, pentane, benzene, xylene, dichloromethane, trichloromethane, tetrachloromethane, and tetrahydrofuran.
7. The method of claim 5, wherein, in step 4), the conditions of the fourth reaction comprise: the reaction temperature is 50-200 ℃, and the reaction time is 2-30 h.
8. A nitrogen and phosphine containing early transition metal compound prepared by the process of any one of claims 5 to 7.
9. A catalyst composition for the polymerization of olefins comprising a procatalyst which is a nitrogen and phosphine containing early transition metal compound according to any one of claims 1-4 and 8 and an activator comprising an aluminium containing compound and optionally an organoboron compound.
10. The composition according to claim 9, wherein the activator is an aluminum-containing compound, and the molar ratio of the content of the main catalyst in terms of metal elements to the content of the aluminum-containing compound in terms of aluminum elements is 1: (0.1 to 3000).
11. The composition of claim 10, wherein the activator is an aluminum-containing compound, and the molar ratio of the content of the main catalyst in terms of metal elements to the content of the aluminum-containing compound in terms of aluminum elements is 1: (50-1000).
12. The composition as claimed in claim 9, wherein the activator is an aluminum-containing compound and an organoboron compound, and the main catalyst in terms of metal elements, the aluminum-containing compound in terms of aluminum elements and the organoboron compound in terms of boron elements are contained in a molar ratio of 1: (5-500): (1-5).
13. The composition as claimed in claim 10, wherein the activator is an aluminum-containing compound and an organoboron compound, and the main catalyst in terms of metal elements, the aluminum-containing compound in terms of aluminum elements and the organoboron compound in terms of boron elements are contained in a molar ratio of 1: (5-200): (1-5).
14. The composition of claim 9, wherein the aluminum-containing compound is a mixture of an alkylaluminum compound and an alkylaluminoxane compound or an alkylaluminoxane compound.
15. The composition according to claim 14, wherein the alkylaluminoxane compound is methylaluminoxane and/or isobutylaluminoxane and the alkylaluminum compound is selected from at least one of trimethylaluminum, triethylaluminum, tripropylaluminum, triisobutylaluminum, trihexylaluminum, dimethylaluminum chloride, diethylaluminum chloride, dipropylaluminum chloride, diisobutylaluminum chloride, dihexylaluminum chloride, methylaluminum dichloride, ethylaluminum dichloride, propylaluminum dichloride, isobutylaluminum dichloride, hexylaluminum dichloride, dimethylaluminum hydride, diethylaluminum hydride, dipropylaluminum hydride, diisobutylaluminum hydride and dihexylaluminum hydride.
16. The composition of claim 9, wherein the organoboron compound is selected from at least one of tris (pentafluorophenyl) boron, N-dimethylanilinium tetrakis (pentafluorophenyl) borate, and triphenylcarbenium tetrakis (pentafluorophenyl) borate.
17. Use of the catalyst composition for olefin polymerization according to any one of claims 9 to 16 for catalyzing ethylene homopolymerization and/or ethylene-alpha olefin copolymerization.
18. A process for preparing an olefin polymer, the process comprising: a method for producing a catalyst composition for olefin polymerization according to any one of claims 9 to 16, comprising contacting an olefin monomer with the catalyst composition in the presence of a solvent.
19. The process for producing an olefin polymer according to claim 18, wherein the conditions of the contact reaction include: the temperature is 50 ℃ below zero to 200 ℃ above zero, the time is 0.1 to 6 hours, and the pressure is 0.1 to 5 MPa.
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| US6133387A (en) * | 1998-11-17 | 2000-10-17 | Nova Chemicals (International) S.A. | Group 8, 9 or 10 olefin copolymerization catalyst |
| US6380333B1 (en) * | 1998-11-17 | 2002-04-30 | Nova Chemicals (International) S.A. | Group 8, 9 or 10 olefin copolymerization catalyst |
| CN102503988A (en) * | 2011-09-23 | 2012-06-20 | 内蒙古大学 | Preparation method for novel ruthenium-carbine complex compound and application thereof to olefin double decomposition reaction |
| CN102875605A (en) * | 2012-09-24 | 2013-01-16 | 内蒙古大学 | Method for preparing olefin metathesis catalysts with high thermal stability and application of olefin metathesis catalysts with high thermal stability |
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| US6133387A (en) * | 1998-11-17 | 2000-10-17 | Nova Chemicals (International) S.A. | Group 8, 9 or 10 olefin copolymerization catalyst |
| US6380333B1 (en) * | 1998-11-17 | 2002-04-30 | Nova Chemicals (International) S.A. | Group 8, 9 or 10 olefin copolymerization catalyst |
| CN102503988A (en) * | 2011-09-23 | 2012-06-20 | 内蒙古大学 | Preparation method for novel ruthenium-carbine complex compound and application thereof to olefin double decomposition reaction |
| CN102875605A (en) * | 2012-09-24 | 2013-01-16 | 内蒙古大学 | Method for preparing olefin metathesis catalysts with high thermal stability and application of olefin metathesis catalysts with high thermal stability |
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