CN102964492B - Synthesis method of bridged metallocene Ti-rare earth dinuclear catalyst - Google Patents
Synthesis method of bridged metallocene Ti-rare earth dinuclear catalyst Download PDFInfo
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Abstract
The invention provides a bridged metallocene Ti-rare earth dinuclear catalyst represented by the following structural formula, wherein M refers to rare earth. The invention further provides a preparation method of the catalyst. The catalyst can be matched with a cocatalyst, namely alkylaluminoxane for olefinic polymerization, has high polymerization activity and can obtain olefinic polymerization products with high molecular weight and broad molecular weight distribution.
Description
Technical field
The invention belongs to polyolefin field, relate to the catalyzer for olefinic polymerization, relate in particular to bimetallic catalyst for ethene and propylene polymerization and preparation method thereof.
Background technology
The active centre of metallocene catalyst is single, the activity of catalyzer is high, can obtain the polymkeric substance that tacticity is very high, and the polymericular weight obtaining is high, molecular weight and molecular weight distribution can be controlled by changing ligand structure, are therefore subject to extensive concern always.But due to the polyolefin molecular weight narrowly distributing obtaining, processing difficulties and limited its process of industrialization.People attempt improving with composite catalyzing or double-core multinuclear catalyzer the molecular weight distribution of polymkeric substance.
Green and his colleagues have synthesized the binuclear compound (T.Ushioda, M.L.H.Green, J.Haggitt, X.Yan, J.Organomet.Chem., 1996,518,155) of Si bridging.Bridging two (cyclopentadiene) two negative ions first with the CpMCl of monovalent
3reaction, obtains the compound of central ion and three cyclopentadiene coordinations, and then with the metal halide of the second equivalent (Cp ' MCl
3or MCl
4) reaction, obtain binuclear compound.This binuclear compound is for vinyl polymerization, and activity is very high (higher than 8.5 * 10
6gPE/mol M h, monokaryon compound M[(η-C
5h
5)
2cl
2] be 3.6 * 10
6gPE/mol M h); Molecular weight distribution (the M that broadens
w/ M
n>5.4).For propylene polymerization, obtain Atactic Polypropelene (mm<0.39, general homogeneous phase Ziegler-Natta catalyst mm>0.90).Author thinks may there is a more than active centre.
CN1428355 discloses a kind of dinuclear metallocene compounds and preparation and the application in olefinic polymerization, discloses the binuclear compound of dimethyl-silicon bridging, and for vinyl polymerization, and high reactivity can reach 10
6gPE/mol Cat.
Although above-mentioned document has been reported dinuclear catalyst, although its catalytic performance, higher than monokaryon catalyzer, does not obtain bimodal polymers.Chinese patent application 200710015194.2 and 200710015193.8 discloses bridged metallocene double-core catalyst and preparation method thereof, but has the defect that step is many, cost is high, total recovery is low.201110030833.9 disclose a kind of C2 bridged metallocene Zr-tombarthite catalyst and preparation method thereof, but step is many, and aftertreatment is loaded down with trivial details.
Summary of the invention
The preparation method who the object of this invention is to provide bridging metallocene Ti-rare earth binucleated catalyst, this preparation method's step is few, raw material is easy to get, and cost is low, is easy to industrialization.
Bridging metallocene Ti-rare earth binucleated catalyst of the present invention, alkylaluminoxane are promotor, and catalyzed ethylene or propylene polymerization can obtain the polyolefine of wide molecular weight distribution.Polymerization process can adopt mass polymerization or solution polymerization.
The invention provides a kind of bridging metallocene Ti-rare earth binucleated catalyst, its structure is as follows:
Wherein M is rare earth, and preferred, M is selected from Y, Nd or Sm.
The synthetic method that the invention provides described bridging metallocene Ti-rare earth binucleated catalyst, comprises the following steps:
1) fluorenyl ligand is synthetic
The bromo-1-hexene of the chloro-6-of 5-is dissolved in organic solvent, is cooled to-30～0 ℃, slowly drips fluorenes lithium solution, and time for adding 1.5 ~ 2.5 hours dropwises and continues reaction 8 ~ 12 hours;
The mol ratio of the bromo-1-hexene of the chloro-6-of 5-and fluorenes lithium is: the bromo-1-hexene of the chloro-6-of 5-: fluorenes lithium=1 ~ 1.1:1; Organic solvent is selected from anhydrous diethyl ether or sherwood oil.
2) bridging indenyl fluorenyl ligand is synthetic
In the fluorenyl ligand that step 1) obtains, add solvents tetrahydrofurane, then react with indenes lithium, obtain the indenyl fluorenyl ligand of bridging; The mol ratio of fluorenyl ligand and indenes lithium is 1:1～1:1.1; Temperature of reaction is-30 ℃～0 ℃; Reaction times is 12-18 hour.
3) part lithium salts is synthetic
By step 2) part that obtains is dissolved in normal hexane, drips n-Butyl Lithium, and dropping temperature is-20～10 ℃, and the mol ratio of part and n-Butyl Lithium is 1:2.0～2.5, dropwises, and naturally rises to room temperature, reacts 10～15 hours.Remove by filter insolubles, decompressing and extracting normal hexane, obtains part lithium salts.
4) title complex intermediate (I) is synthetic
In the part lithium salts that step 3) obtains, add toluene, obtain white opacity liquid, i.e. the suspension of above-mentioned lithium salts, adds CpTiCl at 0～30 ℃
3, wherein Cp is cyclopentadienyl.CpTiCl
3with the mol ratio of part lithium salts be 1:(1～1.1), stirring reaction 20～26 hours, reaction product is through centrifugation, residual solid is used dichloromethane extraction again, all extraction liquids and the centrifugal liquid obtaining are merged, be concentrated into and occur solid, place for-15 ℃～0 ℃ and within 12～24 hours, obtain title complex intermediate (I);
（I）。
5) bridging metallocene Ti-rare earth binucleated catalyst is synthetic
In benzene or toluene, the catalyzer of formula (I) and expression formula are CpMCl
3cyclopentadiene muriate according to the molar ratio reaction of 1:1～1.2, temperature of reaction is 90～100 ℃, the time is 12～20 hours; Wherein M is rare earth, and preferred, M is selected from Y, Nd or Sm;
React complete filtration, remove insolubles, after filtrate is concentrated, use organic solvent recrystallization, obtain the bridging metallocene Ti-rare earth binucleated catalyst shown in formula (II):
（II）。
Preferably, the reaction times in step 5) is 12～16 hours, and recrystallization organic solvent used is selected from the mixed solvent of toluene, methylene dichloride or toluene and methylene dichloride.In the mixed solvent of toluene and methylene dichloride, the ratio of toluene and methylene dichloride is 1:1 ~ 2 volume ratio.
Preferably, in step 1), organic solvent is selected from sherwood oil.Temperature of reaction is-20～-10 ℃, and the reaction times is 10 ~ 12 hours; The mol ratio of the bromo-1-hexene of the chloro-6-of 5-and fluorenes lithium is: the bromo-1-hexene of the chloro-6-of 5-: fluorenes lithium=1:1.
Preferably, step 2) in, temperature of reaction is-20 ℃～-10 ℃; Reaction times is 14-16 hour; The mol ratio of indenes lithium is 1:1.
Preferably, in step 3), dropping temperature is-10～0 ℃.The mol ratio of part and n-Butyl Lithium is 1:2.0～2.1, dropwises, and naturally rises to room temperature, reacts 12～15 hours.
Preferably, in step 4), temperature of reaction is 0～10 ℃.Stirring reaction 20～24 hours.
Under identical catalytic condition, the catalytic activity of the bridged combined metal TI-rare earth dinuclear catalyst that the present invention obtains than monokaryon metallocene catalyst as CyclopentadienyltitaDichloride Dichloride Cp
2tiCl
2or cyclopentadienyl zirconium dichloride Cp
2tiCl
2catalytic activity high, and the molecular weight of polymkeric substance obviously increases, molecular weight distribution broadens.
Synthetic method of the present invention, compares with the method for reporting in document, and synthetic route is short, and productive rate is high, has avoided expensive reagent use, has better industrial prospect.
Embodiment
The preparation method of bridging metallocene Ti-rare earth binucleated catalyst is as follows:
1) fluorenyl ligand is synthetic
The bromo-1-hexene of the chloro-6-of 5-is dissolved in organic solvent, is cooled to-30～0 ℃, slowly drips fluorenes lithium solution, and time for adding 1.5 ~ 2.5 hours dropwises and continues reaction 10 ~ 12 hours;
The mol ratio of the bromo-1-hexene of the chloro-6-of 5-and fluorenes lithium is: the bromo-1-hexene of the chloro-6-of 5-: fluorenes lithium=1 ~ 1.1:1;
Organic solvent is selected from anhydrous diethyl ether or sherwood oil.
Synthetic method is shown below:
The selection of solvent is extremely important, selects anhydrous diethyl ether or sherwood oil as solvent, can effectively control the degree of reaction, and the Br that can control in the bromo-1-hexene of the chloro-6-of 5-reacts, and Cl does not react.And while selecting the larger solvent of methylene dichloride, toluene or tetrahydrofuran (THF) isopolarity, Br and Cl can participate in reaction, the elective reduction of reaction.
While using the chloro-1-hexene of 5,6-bis-as reactant, fluorenes lithium solution slowly need be added drop-wise in the bromo-1-hexene of the chloro-6-of 5-solution, and in reaction, keep the bromo-1-hexene of the chloro-6-of 5-excessive always.Condition is controlled improper meeting and is produced 9,10-, bis-indenyls-1-decene.Cannot there is the next step in 9,10-, bis-indenyls-1-decene, need to be separated through gel column.And the present invention utilizes the reactive difference of Br and Cl, the selection by suitable reaction conditions obtains object product.Avoided the separation of later stage product.Temperature of reaction is-30～0 ℃, does not need too low temperature of reaction, is easy to control and save the energy.
The concentration of the bromo-1-hexene of the chloro-6-of 5-does not limit, and those skilled in the art can select suitable concentration according to practical situation.Fluorenes lithium is synthetic with known method by fluorenes and butyllithium.Butyllithium can be bought also and can by Li band, be prepared in sherwood oil or normal hexane solvent with chlorobutane according to known method.
React complete, decompression steams after most of solvent, separated through chromatographic column, obtains the chloro-1-hexene of 6-indenyl-5-, saves backup.Also can be separated without chromatographic column, after completion of the reaction, steam and desolventize the rear the next step of directly carrying out.
2) bridging indenyl fluorenyl ligand is synthetic
In the fluorenyl ligand that step 1) obtains, add solvents tetrahydrofurane, then react with indenes lithium, obtain the indenyl fluorenyl ligand of bridging.The mol ratio of fluorenyl ligand and indenes lithium is 1:1～1:1.1; Temperature of reaction is-30 ℃～0 ℃; Reaction times is 12-18 hour.
If the fluorenyl ligand that step 1) obtains does not steam, directly carry out step 2 except organic solvent) reaction, speed of response is very slow, products collection efficiency is low.We find, use step 2) in while using tetrahydrofuran (THF) for solvent, side reaction is few, can react rapidly, the part productive rate obtaining is high.
Indenes lithium is synthetic with known method by indenes and butyllithium.Butyllithium can be bought also and can by chlorobutane and Li, be prepared according to known method.The order of addition(of ingredients) of fluorenyl ligand and indenes lithium is not particularly limited, and preferably indenes lithium solution is added drop-wise to the mode in fluorenyl ligand.
Synthetic method is shown below:
3) part lithium salts is synthetic
By step 2) part that obtains is dissolved in normal hexane, drips n-Butyl Lithium, and dropping temperature be-20～10 ℃, preferred-10～0 ℃.The mol ratio of part and n-Butyl Lithium is 1:2.0～2.5, dropwises, and naturally rises to room temperature, reacts 10～15 hours.Remove by filter insolubles, decompressing and extracting normal hexane, obtains part lithium salts.
Drain the part lithium salts obtaining after normal hexane, be easy to preserve, also easily make various solution or suspension.Also can not drain solvent, after concentrating, directly carry out lower step and synthesize.
4) title complex intermediate (I) is synthetic
In the part lithium salts that step 3) obtains, add toluene, obtain white opacity liquid, i.e. the suspension of above-mentioned lithium salts, adds CpTiCl at 0～30 ℃
3, wherein Cp is cyclopentadienyl.CpTiCl
3with the mol ratio of part lithium salts be 1:(1～1.1), stirring reaction 20～26 hours, reaction product is through centrifugation, residual solid is used dichloromethane extraction again, all extraction liquids and the centrifugal liquid obtaining are merged, be concentrated into and occur solid, place for-15 ℃～0 ℃ and within 12～24 hours, obtain title complex intermediate (I);
（I）。
Intermediate (I) purity that crystallization obtains is as stated above higher, is easy to analyze.But this intermediate product is very responsive to empty G&W.If not strict airtight preservation, very easily decomposes.
The title complex intermediate (I) obtaining can directly be weighed, and is convenient to calculate the ingredient proportion of compound in each step.
By after all extraction liquids and the centrifugal liquid merging obtaining, after also can concentrating, directly carry out the next step.Do not need-15 ℃～0 ℃ to place 12～24 hours, saved the reaction times, and the catalyzer finally obtaining, catalytic effect is also unaffected.
5) bridging metallocene Ti-rare earth binucleated catalyst is synthetic
In benzene or toluene, the catalyzer of formula (I) and expression formula are CpMCl
3cyclopentadiene muriate according to the molar ratio reaction of 1:1～1.2, temperature of reaction is 90～100 ℃, the time is 12～20 hours; Wherein M is rare earth, and preferred, M is selected from Y, Nd or Sm;
React complete filtration, remove insolubles, after filtrate is concentrated, use organic solvent recrystallization, obtain the bridging metallocene Ti-rare earth binucleated catalyst shown in formula (II):
（II）。
Preferably, the reaction times in step 5) is 12～16 hours, and recrystallization organic solvent used is selected from the mixed solvent of toluene, methylene dichloride or toluene and methylene dichloride.In the mixed solvent of toluene and methylene dichloride, the ratio of toluene and methylene dichloride is 1:1 ~ 2 volume ratio.
In catalyzer preparation of the present invention, the selection of solvent is extremely important; In different reactions steps, use different solvents, be conducive to the carrying out of reaction, be also conducive to improve productive rate.We find, the solvent selection in preparation process, and not exclusively follow the principle of " similar mixing ", such as, in the reaction that has lithium salts to participate in, use the non-polar solvents such as sherwood oil higher than using tetrahydrofuran (THF) productive rate on the contrary.We find to use solvent of the present invention through a large amount of experiments, and reaction yield is the highest.The selection of solvent has also determined that the Br in the bromo-1-hexene of the chloro-6-of 5-reacts, or Br and Cl react; We find, when adopting weak polar solvent (as anhydrous diethyl ether or sherwood oil), can control that Br atom reacts and Cl does not react; But simultaneously also startled discovery, is used nonpolar pentane solvent, and reaction yield is not high.
Each described reaction all need be carried out under inert atmosphere, adopts shenlink technology, and rare gas element is argon gas or nitrogen.
Compound provided by the invention can be made the alpha-olefin homopolymerization of C2～C10 or the Primary Catalysts of copolymerization.During polymerization, also needing to add alkylaluminoxane is promotor.Preferred promotor is methylaluminoxane, and during polyreaction, in promotor, in Al and Primary Catalysts, the mol ratio of metal is 250～1500:1, preferably 250～1000:1.Polymerizing condition is 30～80 ℃, 0.1～0.8MPa.For homopolymerization or copolymerization, obtain alkene optimal ethylene, propylene, butylene, hexene or octene.Polymerization process can adopt mass polymerization or solution polymerization.Analytical procedure and polymkeric substance are described, and adopt the method described in patent application 201110030833.9.
Following examples are to further illustrate of the present invention, but the present invention is not limited thereto.
embodiment 1:
1) fluorenyl ligand is synthetic
The bromo-1-hexene of the chloro-6-of 5-is dissolved in sherwood oil, is cooled to-30 ℃, slowly drips fluorenes lithium solution, and time for adding 2 hours dropwises and continues reaction 10 hours; The mol ratio of the bromo-1-hexene of the chloro-6-of 5-and fluorenes lithium is: the bromo-1-hexene of the chloro-6-of 5-: fluorenes lithium=1:1.
2) bridging indenyl fluorenyl ligand is synthetic
In the fluorenyl ligand that step 1) obtains, add solvents tetrahydrofurane, then react with indenes lithium, obtain the indenyl fluorenyl ligand of bridging.The mol ratio of fluorenyl ligand and indenes lithium is 1:1; Temperature of reaction is-20 ℃; Reaction times is 18 hours.
3) part lithium salts is synthetic
By step 2) part that obtains is dissolved in normal hexane, drips n-Butyl Lithium, and dropping temperature is-20 ℃, and the mol ratio of part and n-Butyl Lithium is 1:2.2, dropwises, and naturally rises to room temperature, reacts 15 hours.Remove by filter insolubles, decompressing and extracting normal hexane, obtains part lithium salts.
4) title complex intermediate (I) is synthetic
In the part lithium salts that step 3) obtains, add toluene, obtain white opacity liquid, i.e. the suspension of above-mentioned lithium salts, adds CpTiCl at 0 ℃
3, wherein Cp is cyclopentadienyl.CpTiCl
3with the mol ratio of part lithium salts be 1:1, stirring reaction 20 hours, reaction product is through centrifugation, residual solid is used dichloromethane extraction again, all extraction liquids and the centrifugal liquid obtaining are merged, be concentrated into and occur solid, place for-15 ℃ and within 12 hours, obtain title complex intermediate;
。
5) bridging metallocene Ti-rare earth binucleated catalyst is synthetic
In benzene or toluene, the catalyzer of formula (I) and expression formula are CpYCl
3cyclopentadiene muriate according to the molar ratio reaction of 1:1～1.2, temperature of reaction is 100 ℃, the time is 14 hours;
React complete filtration, remove insolubles, after filtrate is concentrated, use organic solvent recrystallization, obtain bridging metallocene Ti-rare earth binucleated catalyst:
。
embodiment 2
1) fluorenyl ligand is synthetic
The bromo-1-hexene of the chloro-6-of 5-is dissolved in sherwood oil, is cooled to-20 ℃, slowly drips fluorenes lithium solution, and time for adding 2.5 hours dropwises and continues reaction 8 hours; The mol ratio of the bromo-1-hexene of the chloro-6-of 5-and fluorenes lithium is: the bromo-1-hexene of the chloro-6-of 5-: fluorenes lithium=1.1:1.
2) bridging indenyl fluorenyl ligand is synthetic
In the fluorenyl ligand that step 1) obtains, add solvents tetrahydrofurane, then react with indenes lithium, obtain the indenyl fluorenyl ligand of bridging.The mol ratio of fluorenyl ligand and indenes lithium is 1:1; Temperature of reaction is-10 ℃; Reaction times is 14 hours.
3) part lithium salts is synthetic
By step 2) part that obtains is dissolved in normal hexane, drips n-Butyl Lithium, and dropping temperature is 0 ℃, and the mol ratio of part and n-Butyl Lithium is 1:2.5, dropwises, and naturally rises to room temperature, reacts 12 hours.Remove by filter insolubles, decompressing and extracting normal hexane, obtains part lithium salts.
4) title complex intermediate (I) is synthetic
In the part lithium salts that step 3) obtains, add toluene, obtain white opacity liquid, i.e. the suspension of above-mentioned lithium salts, adds CpTiCl at 10 ℃
3, wherein Cp is cyclopentadienyl.CpTiCl
3with the mol ratio of part lithium salts be 1:1, stirring reaction 24 hours, reaction product is through centrifugation, residual solid is used dichloromethane extraction again, all extraction liquids and the centrifugal liquid obtaining are merged, be concentrated into and occur solid, place for-10 ℃ and within 18 hours, obtain title complex intermediate;
。
5) bridged combined metal TI-rare earth dinuclear catalyst is synthetic
In benzene or toluene, the catalyzer of formula (I) and expression formula are CpYCl
3cyclopentadiene muriate according to 1.2 molar ratio reaction, temperature of reaction is 90 ℃, the time is 12 hours;
React complete filtration, remove insolubles, after filtrate is concentrated, use organic solvent recrystallization, obtain bridged combined metal TI-rare earth dinuclear catalyst:
。
embodiment 3
1) fluorenyl ligand is synthetic
The bromo-1-hexene of the chloro-6-of 5-is dissolved in anhydrous diethyl ether, is cooled to-10 ℃, slowly drips fluorenes lithium solution, and time for adding 1.5 hours dropwises and continues reaction 12 hours; The mol ratio of the bromo-1-hexene of the chloro-6-of 5-and fluorenes lithium is: the bromo-1-hexene of the chloro-6-of 5-: fluorenes lithium=1:1.
2) bridging indenyl fluorenyl ligand is synthetic
In the fluorenyl ligand that step 1) obtains, add solvents tetrahydrofurane, then react with indenes lithium, obtain the indenyl fluorenyl ligand of bridging.The mol ratio of fluorenyl ligand and indenes lithium is 1:1; Temperature of reaction is-5 ℃; Reaction times is 12 hours.
3) part lithium salts is synthetic
By step 2) part that obtains is dissolved in normal hexane, drips n-Butyl Lithium, and dropping temperature is 10 ℃, and the mol ratio of part and n-Butyl Lithium is 1:2.0, dropwises, and naturally rises to room temperature, reacts 10 hours.Remove by filter insolubles, decompressing and extracting normal hexane, obtains part lithium salts.
4) title complex intermediate (I) is synthetic
In the part lithium salts that step 3) obtains, add toluene, obtain white opacity liquid, i.e. the suspension of above-mentioned lithium salts, adds CpTiCl at 30 ℃
3, wherein Cp is cyclopentadienyl.CpTiCl
3with the mol ratio of part lithium salts be 1:1.1, stirring reaction 26 hours, reaction product is through centrifugation, residual solid is used dichloromethane extraction again, all extraction liquids and the centrifugal liquid obtaining are merged, be concentrated into and occur solid, place for 0 ℃ and within 22 hours, obtain title complex intermediate;
。
5) bridging metallocene Ti-rare earth binucleated catalyst is synthetic
In benzene or toluene, the catalyzer of formula (I) and expression formula are CpYCl
3cyclopentadiene muriate according to the molar ratio reaction of 1:1, temperature of reaction is 100 ℃, the time is 18 hours;
React complete filtration, remove insolubles, after filtrate is concentrated, use organic solvent recrystallization, obtain bridged combined metal TI-rare earth dinuclear catalyst:
。
Because Y ion has unpaired electron, so there is paramagnetism.Therefore
1in H NMR spectrum, active change in displacement is large and be generally larger broad peak, and spectrum is read in impact.Correlated Spectroscopy diagram data is as follows:
1H?NMR（CDCl3，25℃）：7.48-7.42(C
5H
5),?7.26-7.21(C
9H
6),?6.82-6.72(C
9H
6),?6.48-6.59(C
9H
6),?6.35-6.42(C
13H
9),?6.15-6.18(C
13H
9),?5.52-5.34(=CH-),?5.04-4.99(=CH
2),?3.38-3.72(THF),?1.59-1.87(CH
2),?1.04-1.10(CH
2)。
Gained catalyst vinyl polymerization, slurry polymerization, solvent is toluene, and methylaluminoxane is as promotor, and in methylaluminoxane, in Al and Primary Catalysts, the mol ratio of metal is 1000:1, and polymerizing condition is 80 ℃, 0.5MPa.
Gained catalyst vinyl polymerization, active in 1.31 * 10
5g ethene/mmol Ti h, Mw/Mn=2.34, molecular weight distribution compares Cp
2tiCl
2the polyethylene catalyzing and synthesizing is wide.
embodiment 4:
Other are with embodiment 1, and different is with CpSmCl
3replace CpYCl
3, be heated to 110 ℃ of reflux temperatures, under reflux state, stirring reaction is 12 hours, stops stirring, and is down to room temperature.Reacting liquid filtering is removed solids, then filtrate is concentrated into 1/3 of original volume, puts into refrigerator ,-10 ℃ standing 20 hours, obtain silver gray crystalline solid, its structure is shown below.Productive rate 48.2%.
Because Sm ion has unpaired electron, so there is paramagnetism.Therefore
1in H NMR spectrum, active change in displacement is large and be generally larger broad peak, and spectrum is read in impact.Correlated Spectroscopy diagram data is as follows:
1h NMR(CDCl3,25 ℃): 7.55-7.46 (C
5h
5), 7.35-7.24 (C
9h
6), 6.87-6.70 (C
9h
6), 6.47-6.50 (C
9h
6), 6.40-6.45 (C
13h
8), 6.18-6.22 (C
13h
8), 5.52-5.38 (=CH-), 5.05-4.97 (=CH
2), 3.32-3.60 (THF), 1.44-1.62 (CH
2), 1.01-1.12 (CH
2).
Gained catalyst vinyl polymerization, active in 1.08 * 10
5g ethene/mmol Ti h, Mw/Mn=2.66, molecular weight distribution compares Cp
2tiCl
2the polyethylene catalyzing and synthesizing is wide.
embodiment 5:
Other are with embodiment 1, and different is with CpNdCl
3replace CpYCl
3, be heated to 120 ℃ of reflux temperatures, along with the rising of temperature of reaction, reaction solution changes into orange red by yellow gradually.Under reflux state, stirring reaction is 18 hours, stops stirring, and is down to room temperature.After filtration, filtrate is concentrated into original volume 1/3 ,-10 ℃ standing 20 hours, obtain silver gray crystalline solid, productive rate 44%.
Because Nd ion has unpaired electron, so there is paramagnetism.Therefore
1in H NMR spectrum, active change in displacement is large and be generally larger broad peak, and spectrum is read in impact.Correlated Spectroscopy diagram data is as follows:
1H?NMR（CDCl3，25℃）：7.70-7.56(C
5H
5),?7.46-7.35(C
9H
6),?6.90-6.80(C
9H
6),?6.47-6.50(C
9H
6),?6.37-6.33(C
13H
9),?6.30-6.24(C
13H
9),?5.60-5.48(=CH-),?5.10-5.07(=CH
2),?3.42-3.78(THF),?1.59-1.64(CH
2),?1.25-1.32(CH
2)。
Gained catalyst vinyl polymerization, active in 1.22 * 10
5g ethene/mmol Ti h, Mw/Mn=3.21, molecular weight distribution compares Cp
2tiCl
2the polyethylene catalyzing and synthesizing is wide.
Claims (6)
1. a synthetic method for bridging metallocene Ti-rare earth binucleated catalyst, comprises the following steps:
1) fluorenyl ligand is synthetic
The bromo-1-hexene of the chloro-6-of 5-is dissolved in organic solvent, is cooled to-20～-10 ℃, slowly drips fluorenes lithium solution, and time for adding 1.5～2.5 hours dropwises and continues reaction 10～12 hours;
The mol ratio of the bromo-1-hexene of the chloro-6-of 5-and fluorenes lithium is: the bromo-1-hexene of the chloro-6-of 5-: fluorenes lithium=1:1; Organic solvent is selected from sherwood oil;
2) bridging indenyl fluorenyl ligand is synthetic
Step 1) in the fluorenyl ligand obtaining, add solvents tetrahydrofurane, then react with indenes lithium, obtain the indenyl fluorenyl ligand of bridging; The mol ratio of fluorenyl ligand and indenes lithium is 1:1～1:1.1; Temperature of reaction is-30 ℃～0 ℃; Reaction times is 12-18 hour;
3) part lithium salts is synthetic
By step 2) part that obtains is dissolved in normal hexane, drips n-Butyl Lithium, and dropping temperature is-20～10 ℃, and the mol ratio of part and n-Butyl Lithium is 1:2.0～2.5, dropwises, and naturally rises to room temperature, reacts 10～15 hours; Remove by filter insolubles, decompressing and extracting normal hexane, obtains part lithium salts;
4) title complex intermediate (I) is synthetic
Step 3) in the part lithium salts obtaining, add toluene, obtain white opacity liquid, i.e. the suspension of above-mentioned lithium salts, adds CpTiCl at 0～30 ℃
3, wherein Cp is cyclopentadienyl; CpTiCl
3with the mol ratio of part lithium salts be 1:(1～1.1), stirring reaction 20～26 hours, reaction product is through centrifugation, residual solid is used dichloromethane extraction again, all extraction liquids and the centrifugal liquid obtaining are merged, be concentrated into and occur solid, place for-15 ℃～0 ℃ and within 12～24 hours, obtain title complex intermediate (I);
5) bridging metallocene Ti-rare earth binucleated catalyst is synthetic
In benzene or toluene, the catalyzer of formula (I) and expression formula are CpMCl
3cyclopentadiene muriate according to the molar ratio reaction of 1:1～1.2, temperature of reaction is 90～100 ℃, the time is 12～20 hours; Wherein M is rare earth, reacts complete filtration, removes insolubles, after filtrate is concentrated, uses organic solvent recrystallization, obtains the bridging metallocene Ti-rare earth binucleated catalyst shown in formula (II):
2. the synthetic method of bridging metallocene Ti-rare earth binucleated catalyst as claimed in claim 1, is characterized in that, M is selected from Y, Nd or Sm.
3. the synthetic method of bridging metallocene Ti-rare earth binucleated catalyst as claimed in claim 1, it is characterized in that, step 5) reaction times in is 12～16 hours, and recrystallization organic solvent used is selected from the mixed solvent of toluene, methylene dichloride or toluene and methylene dichloride.
4. the synthetic method of bridging metallocene Ti-rare earth binucleated catalyst as claimed in claim 1, is characterized in that step 2) in, temperature of reaction is-20 ℃～-10 ℃; Reaction times is 14-16 hour; The mol ratio of fluorenyl ligand and indenes lithium is 1:1.
5. the synthetic method of bridging metallocene Ti-rare earth binucleated catalyst as claimed in claim 1, is characterized in that step 3) in, dropping temperature is-10～0 ℃; The mol ratio of part and n-Butyl Lithium is 1:2.0～2.1, dropwises, and naturally rises to room temperature, reacts 12～15 hours.
6. the synthetic method of bridging metallocene Ti-rare earth binucleated catalyst as claimed in claim 1, is characterized in that step 4) in, temperature of reaction is 0～10 ℃; Stirring reaction 20～24 hours.
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