CN102952218A - Alkene polymerization method - Google Patents
Alkene polymerization method Download PDFInfo
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- CN102952218A CN102952218A CN2011102473114A CN201110247311A CN102952218A CN 102952218 A CN102952218 A CN 102952218A CN 2011102473114 A CN2011102473114 A CN 2011102473114A CN 201110247311 A CN201110247311 A CN 201110247311A CN 102952218 A CN102952218 A CN 102952218A
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Abstract
The invention provides an alkene polymerization method which comprises contacting one or more alkenes with a load-type metallocene catalyst under an alkene polymerization condition, wherein the catalyst comprises a carrier and an alkyl aluminoxane/magnesium chloride complex and a metallocene compound loaded on the carrier, the carrier has an average particle diameter of 20 to 80 micrometers and a specific surface area of 550 to 650 square meter per gram, and the metallocene compound has a structure as shown in a formula 1. When used for catalyzing the alkene polymerization, the load-type metallocene catalyst provided by the invention has a catalytic efficiency up to 2.3 * 10<8> gPE / (mol Zr * h) while homopolymerization and a catalytic efficiency up to 2.2 * 10<8> gPE / (mol Zr * h) while copolymerization under 70 DEG C, overcomes defects of sticking to kettles, is low in a polymerization temperature, and reduces energy consumption to some extent. The formula 1 is as shown in the specification.
Description
Technical field
The present invention relates to a kind of olefine polymerizing process.
Background technology
Olefin polymerization catalysis is the core of polyolefine technical development, and carrier is again a very crucial factor in the innovation of catalyzer.Carrier not only plays a part carrying, dispersed activity center, also might have an effect as a kind of special part and active centre, thereby improve the activity and selectivity of catalyzer.At present, most of olefin polymetiation process processes (such as vapour phase polymerization, slurry polymerization etc.) all need working load type catalyzer, to improve the activity of catalyzer.Satisfy processing requirement, avoid polymkeric substance to stick the still phenomenon, improve the form of polymkeric substance.
In the used various carriers of supported olefin polymerization catalyst, MgCl
2Carrier be up to now industrial application at most, the most effective carrier.But contain the components such as alcohol, water and alkoxyl group in the magnesium chloride support, therefore, document 1: Xiao Shijing, Yu Fusheng; Catalysts for Olefin Polymerization and polyolefine, press of Beijing University of Technology, 2002.1-10 puts down in writing MgCl among the P30-42
2Before load, need carry out activation treatment, to increase the specific surface area of carrier, improve charge capacity and the dispersity of active ingredient.At present, MgCl
2Activation treatment adopt the alcohol adduct method more, such as document 2: Wang Yaohua, Ceng Jinlong, Zheng Ronghui; Magnesium chloride support and polyethylene high-efficiency catalyst, Guangxi Normal University's journal, 1986, (1): report among the 43-49, but alcohol adduct method activation MgCl
2Complex process, cost higher, and because the less 13.8m of specific surface area of magnesium chloride
2/ g, the also less (0.017m of pore volume
3/ g), dispersity as carrier active ingredient after loading process finishes is lower, carry out easily sticking still in the ethylene polymerisation process, therefore, in the urgent need to development technology novel carriers simple, with low cost, with the good supported olefin polymerization catalyst of processability, magnesium chloride is carried out secondary load.
With MgCl
2Compare, mesoporous material has larger specific surface area and relatively large aperture, can process larger molecule or group, can make catalyzer well bring into play its due catalytic activity, in addition, utilizes mesoporous material as carrier, has following advantage:
(1) mesoporous material of synthetic does not contain the impurity that easily makes polymer degradation, will improve the ageing resistance of polyolefine material;
(2) the mesoporous material nano pore has the dual-use function of carrier and reactor, and catalyst cupport efficient is high, and polymerization process is controlled easily, and can key in the active centre in the skeleton of polymerization reactor, accelerates reaction process, improves productive rate;
(3) insertion has three-dimensional selection effect with polyreaction to monomer, can improve polyolefinic molecular weight and fusing point.
This shows that the olefin coordination polymerization that appears as of mesoporous material load olefin polymerization catalysis has been opened up a new field.
Present document 3 (Weckhuysen B M, Rao R R, PelgriGJ-MBQ J, et al.Chem EurJ, 2000,6:2960.) and document 4 (Rao R R, Weckhuysen B M, Schoonheydt R A.ChemCommun, 1999,445.) in the mesoporous material of load polyethylene catalysts-metallocene catalyst of report be MCM-41, but activity only is 7.3 * 10 during catalyzed ethylene polymerization
5GPE/ (mol Zr h); Document 5 (Chen S T, Guo C Y, Lei L, et al.Polymer, 2005,46:11093.) report is take catalytic activity after the MCM-41 of load metallocene carries out vinyl polymerization again after MAO processes as 10
6GPE/ (mol Zr h); The hole wall structure thermostability and the hydrothermal stability that carry out the lower reason of ethylene polymerization activity behind the Mesoporous silica MCM 41 supported catalyst and mainly be MCM-41 are relatively poor, just there is part to cave at the loading process hole wall, affected load effect, to such an extent as to affected catalytic activity.
CN1718596A discloses a kind of carried metallocene catalyst, and this catalyzer is by with Cp
2ZrCl
2It is upper and obtain to load on the SBA-15 that processes through MAO.But the catalytic activity of the disclosed carried metallocene catalyst of CN1718596A awaits further to improve.
CN1923862A discloses a kind of olefin polymerization catalysis of mesoporous molecular sieve carried, and this catalyzer is that the SBA-15 that processes through MAO is upper to be obtained by the semi-sandwich alum metallic compound shown in the following formula is loaded on,
But the catalytic activity of the disclosed catalyzer of CN1923862A is the highest also only has 10
6GPE/ (molZrh).
CN101172988A discloses a kind of magnesium chloride loaded metallocene catalyst component and method for making and application; CN101173011A discloses a kind of magnesium chloride load non-metallocene schiff base catalyst component and method for making and application; But CN101172988A and CN101173011A all utilize magnesium chloride to carry out metallocene or non-metallocene schiff base catalyst load as carrier, because the less 13.8m of specific surface area of magnesium chloride
2/ g, the also less (0.017m of pore volume
3/ g), although therefore polymerization activity is higher in polymerization process, polymerization temperature is 80 ℃, and energy consumption is high, and inhomogeneous in the magnesium chloride surface arrangement when metallocene or non-metallocene schiff base catalyst and auxiliary agent load thereof, the polymkeric substance that therefore obtains when carrying out vinyl polymerization is easy to sticking still.
Therefore, how to obtain a kind of high catalytic activity and when being used for olefinic polymerization, can overcome the defective of sticking still and polymerization temperature is low that magnesium chloride is realized that secondary load type metallocene catalyst remains a technical problem that needs to be resolved hurrily.
Summary of the invention
The catalytic activity polymkeric substance lower, that obtain when being used for olefinic polymerization that the object of the invention is to overcome the carried metallocene catalyst of prior art is easy to sticking still and the high problem of energy consumption, and a kind of efficient olefine polymerizing process is provided.
The invention provides a kind of olefine polymerizing process, the method is included under the olefinic polymerization condition, one or more alkene are contacted with carried metallocene catalyst, it is characterized in that, described carried metallocene catalyst comprises carrier and loads on alkylaluminoxane on the described carrier/magnesium chloride complex compound and metallocene compound, described carrier is sphericity mesoporous silicon dioxide, the average particle diameter of described carrier is the 20-80 micron, specific surface area is the 550-650 meters squared per gram, pore volume is 0.4-1.2 ml/g, and the most probable aperture is the 1-7 nanometer; Described metallocene compound has the structure shown in the formula 1:
Wherein, R
1, R
2, R
3, R
4, R
5, R
1', R
2', R
3', R
4' and R
5' be hydrogen or C independently of one another
1-C
5Alkyl in a kind of, and R
1, R
2, R
3, R
4And R
5In at least one be C
1-C
5Alkyl, R
1', R
2', R
3', R
4' and R
5' at least one be C
1-C
5Alkyl; M is a kind of in titanium, zirconium and the hafnium; X is halogen.
Carried metallocene catalyst according to olefine polymerizing process employing of the present invention, alkylaluminoxane/magnesium chloride complex compound and metallocene compound are loaded on the sphericity mesoporous silicon dioxide of bigger serface and good catalytic adsorption performance, can access a Stability Analysis of Structures, therefore the carried metallocene catalyst that catalytic activity is high has high catalytic activity.
According to olefine polymerizing process of the present invention because the described carrier sphericity mesoporous silicon dioxide that adopts has high catalytic activity, thereby method of the present invention has higher polymerization efficiency or catalytic efficiency.
And, no matter be used for the homopolymerization of alkene according to olefine polymerizing process of the present invention, or be used for the copolymerization of alkene, all demonstrate high catalytic efficiency.Particularly, when adopting method of the present invention to carry out olefinic polymerization, catalytic efficiency is at 70 ℃ the time, and catalytic efficiency can reach 2.3 * 10 during homopolymerization
8GPE/ (molZrh), catalytic efficiency can reach 2.2 * 10 during copolymerization
8GPE/ (mol Zrh), and in the identical situation of other conditions, the catalytic efficiency when using the disclosed semi-sandwich alum metallic compound of CN1923862A to load on catalyzer on the SBA-15 that MAO processes under 80 ℃ of conditions is 1000gPE/ (gcath); Use the open Cp of CN1718596A
2ZrCl
2Catalytic efficiency is 10 when loading on the catalyzer on the SBA-15 that MAO processes
6GPE/ (mol Zrh).
Description of drawings
Fig. 1 is X-ray diffracting spectrum, indicates the X-ray diffraction graphic representation be depicted as GJ-MBQ such as figure, X-coordinate unit be 2 θ (°), ordinate zou is intensity.
Fig. 2 is X-ray diffracting spectrum, indicates the X-ray diffraction graphic representation be depicted as GJ-MBQ-Mg-BU such as figure, X-coordinate unit be 2 θ (°), ordinate zou is intensity.
Fig. 3 is N
2The adsorption desorption graphic representation, wherein, the adsorption desorption curve of GJ-MBQ and GJ-MBQ-Mg-BU is shown in indicating among the figure, and X-coordinate is relative pressure, and unit is p/p
0, ordinate zou is pore volume absorption, unit is cm
3/ gSTP.
Fig. 4 is pore size distribution curve, and wherein, a is the graph of pore diameter distribution of GJ-MBQ, and b is the graph of pore diameter distribution of GJ-MBQ-Mg-BU, and X-coordinate is the aperture, and unit is nm, and ordinate zou is dv/dlog, and unit is cm
3/ g.
Fig. 5 is stereoscan photograph, wherein, and a
1And a
2Be the stereoscan photograph of GJ-MBQ, b
1And b
2Stereoscan photograph for GJ-MBQ-Mg-BU.
Embodiment
The invention provides a kind of olefine polymerizing process, the method is included under the olefinic polymerization condition, one or more alkene are contacted with carried metallocene catalyst, it is characterized in that, described luxuriant as quickly as possible catalyzer comprises carrier and loads on alkylaluminoxane on the described carrier/magnesium chloride complex compound and metallocene compound, described carrier is sphericity mesoporous silicon dioxide, the average particle diameter of described carrier is the 20-80 micron, specific surface area is the 550-650 meters squared per gram, pore volume is 0.4-1.2 ml/g, and the most probable aperture is the 1-7 nanometer; Described metallocene compound has the structure shown in the formula 1:
Wherein, R
1, R
2, R
3, R
4, R
5, R
1', R
2', R
3', R
4' and R
5' be hydrogen or C independently of one another
1-C
5Alkyl in a kind of, and R
1, R
2, R
3, R
4And R
5In at least one be C
1-C
5Alkyl, R
1', R
2', R
3', R
4' and R
5' at least one be C
1-C
5Alkyl; M is a kind of in titanium, zirconium and the hafnium; X is halogen.
According to the present invention, the specific surface area of described carried metallocene catalyst can be the 180-220 meters squared per gram, is preferably the 190-210 meters squared per gram, more preferably 206 meters squared per gram; Pore volume can be 0.1-0.5 ml/g, is preferably 0.2-0.4 ml/g, more preferably 0.3 ml/g; The most probable aperture can be the 4-8 nanometer, is preferably the 5-7 nanometer, more preferably 6.4 nanometers.
According to the present invention, loading on metallocene compound on the described carrier and the amount of alkylaluminoxane/magnesium chloride complex compound can change within a large range.The present inventor finds, described alkylaluminoxane/magnesium chloride complex compound and the charge capacity of metallocene compound on described carrier are take the total amount of described carried metallocene catalyst as benchmark, the total content of described metallocene compound and alkylaluminoxane/magnesium chloride complex compound can be the 10-60 % by weight, be preferably the 45-55 % by weight, more preferably the 48-52 % by weight most preferably is 48.8 % by weight; The content of described carrier can be the 40-90 % by weight, is preferably the 45-55 % by weight, and more preferably the 48-52 % by weight most preferably is 51.2 % by weight.Take the total amount of described alkylaluminoxane/magnesium chloride complex compound as benchmark, the content of described alkylaluminoxane is the 1-50 % by weight, is preferably the 15-45 % by weight, and more preferably the 30-40 % by weight most preferably is 33.33 % by weight; The content of described magnesium chloride is the 50-99 % by weight, is preferably the 55-85 % by weight, and more preferably the 60-70 % by weight most preferably is 66.67 % by weight.
According to the present invention, the alkylaluminoxane in described alkylaluminoxane/magnesium chloride complex compound and the ratio between the metallocene compound can be the known ratio of the technician of field of olefin polymerisation.Particularly, the aluminium in described alkylaluminoxane/magnesium chloride complex compound and the mol ratio of the M in the described metallocene compound can be 50-200: 1, be preferably 110-150: and 1,120-140 more preferably: 1, most preferably be 130: 1.
According to the present invention, what the M in the formula 1 can be in titanium, zirconium and the hafnium is a kind of.M in the different metallocene compound molecules can be identical or different, and preferably, M is zirconium.
According to the present invention, the X in the formula 1 is halogen.What particularly, the X in the formula 1 can be in fluorine, chlorine, bromine and the iodine is a kind of.X in the different metallocene compound molecules can be identical or different, and preferably, the X in the formula 1 is chlorine or bromine.More preferably, the X in the formula 1 is chlorine.
According to the present invention, in the formula 1, cyclopentadienyl is for forming η with central metal
5Key and with the derivative of the cyclopentadienyl of alkyl substituent.Preferably, the R on the cyclopentadienyl in the formula 1
1, R
2, R
3, R
4, R
5, R
1', R
2', R
3', R
4' and R
5' be hydrogen or C independently of one another
1-C
5Alkyl, and R
1, R
2, R
3, R
4And R
5In at least one be C
1-C
5Alkyl, R
1', R
2', R
3', R
4' and R
5' at least one be C
1-C
5Alkyl.
Among the present invention, described C
1-C
5Alkyl can be in methyl, ethyl, n-propyl, sec.-propyl, normal-butyl, sec-butyl, isobutyl-, the tertiary butyl, n-pentyl, isopentyl, tert-pentyl and the neo-pentyl a kind of.
The specific examples that satisfies the cyclopentadienyl of above-mentioned requirements comprises: methyl cyclopentadienyl, 1,2-dimethyl-cyclopentadienyl, 1,3-dimethyl-cyclopentadienyl, 1,2,3-trimethylammonium-cyclopentadienyl, 1,2,4-trimethylammonium-cyclopentadienyl, 1,2,3,4-tetramethyl--cyclopentadienyl, the pentamethyl-cyclopentadienyl, the ethyl cyclopentadienyl, 1,2-diethyl-cyclopentadienyl, 1,3-diethyl-cyclopentadienyl, 1,2,4-triethyl-cyclopentadienyl, 1,3,5-triethyl-cyclopentadienyl, 1-methyl-2-ethyl-cyclopentadienyl, 1-methyl-3-ethyl-cyclopentadienyl, the n-propyl cyclopentadienyl, the sec.-propyl cyclopentadienyl, 1,3-diη-propyl-cyclopentadienyl, 1-methyl-3-n-propyl-cyclopentadienyl, 1,3-di-isopropyl-cyclopentadienyl, 1-methyl-3-sec.-propyl-cyclopentadienyl, n-butyl cyclopentadienyl, the sec-butyl cyclopentadienyl, the isobutyl-cyclopentadienyl, tertiary butyl cyclopentadienyl, 1,3-di-n-butyl-cyclopentadienyl, 1-methyl-3-normal-butyl-cyclopentadienyl, 1,3-di-sec-butyl-cyclopentadienyl, 1-methyl-3-sec-butyl-cyclopentadienyl, 1,3-diisobutyl-cyclopentadienyl, 1-methyl 3-isobutyl--cyclopentadienyl, 1,3-di-t-butyl-cyclopentadienyl, the 1-methyl 3-tertiary butyl-cyclopentadienyl, the n-pentyl cyclopentadienyl, the isopentyl cyclopentadienyl, the tert-pentyl cyclopentadienyl, the neo-pentyl cyclopentadienyl, 1,3-two n-pentyls-cyclopentadienyl, 1-methyl-3-n-pentyl-cyclopentadienyl, 1,3-diisoamyl-cyclopentadienyl, 1-methyl-3-isopentyl-cyclopentadienyl, 1,3-two tert-pentyls-cyclopentadienyl, 1-methyl-3-tert-pentyl-cyclopentadienyl, 1,3-di neo-pentyl-cyclopentadienyl, 1-methyl-3-neo-pentyl-cyclopentadienyl.
Preferably, the R in the formula 1
1And R
1' be C independently of one another
1-C
5Alkyl, R
2, R
3, R
4, R
5, R
2', R
3', R
4' and R
5' be hydrogen.The specific examples that satisfies the cyclopentadienyl of above-mentioned requirements comprises: methyl cyclopentadienyl, ethyl cyclopentadienyl, n-propyl cyclopentadienyl, sec.-propyl cyclopentadienyl, n-butyl cyclopentadienyl, sec-butyl cyclopentadienyl, isobutyl-cyclopentadienyl, tertiary butyl cyclopentadienyl, n-pentyl cyclopentadienyl, isopentyl cyclopentadienyl, tert-pentyl cyclopentadienyl, neo-pentyl cyclopentadienyl.
More preferably, R
1And R
1' for being normal-butyl or the tertiary butyl.The specific examples that satisfies the cyclopentadienyl of above-mentioned requirements is tertiary butyl cyclopentadienyl, n-butyl cyclopentadienyl.
According to the present invention, the alkylaluminoxane in described alkylaluminoxane/magnesium chloride complex compound can be metallocene catalyst field various alkylaluminoxanes commonly used.Usually, the alkyl in the described alkylaluminoxane can be C
1-C
5Alkyl.Described C
1-C
5Alkyl can be in methyl, ethyl, n-propyl, sec.-propyl, normal-butyl, sec-butyl, isobutyl-, the tertiary butyl, n-pentyl, isopentyl, tert-pentyl and the neo-pentyl a kind of.Be preferably methyl, namely the alkylaluminoxane in described alkylaluminoxane/magnesium chloride complex compound is methylaluminoxane.
The present inventor finds in research process, the R in formula 1
1And R
1' be normal-butyl, M is zirconium, X is chlorine, be that described metallocene compound is two (normal-butyl-cyclopentadienyl) zirconium dichlorides, and when described alkylaluminoxane is methylaluminoxane, when described carried metallocene catalyst is used for the polyreaction of catalyzed alkene, demonstrate excellent especially catalytic activity.
According to the present invention, the size of described sphericity mesoporous silicon dioxide carrier can in very large range change, under the preferable case, described meso-porous titanium dioxide silicon carrier is sphericity mesoporous silicon dioxide, the average particle diameter of described sphericity mesoporous silicon dioxide carrier is the 20-80 micron, specific surface area can be the 550-650 meters squared per gram, and pore volume can be 0.4-1.2 ml/g, and the most probable aperture can be the 1-7 nanometer; More preferably, the average particle diameter of described sphericity mesoporous silicon dioxide carrier is the 20-80 micron, and specific surface area can be the 580-620 meters squared per gram, and pore volume can be 0.6-1.0 ml/g, and the most probable aperture can be the 3-6 nanometer; More preferably, the specific surface area of described sphericity mesoporous silicon dioxide can be 602 meters squared per gram, and pore volume can be 0.8 ml/g, and the most probable aperture can be 4 nanometers.
According to the present invention, described sphericity mesoporous silicon dioxide is made by the method that may further comprise the steps: at template, N, dinethylformamide exists lower, tetraethoxy and acidic aqueous solution are carried out first to be contacted, and gained mixture after the first contact carried out second with ES955 silica gel and contact, with the mixture crystallization under crystallization condition after the second contact, the gained crystallization product is heated, removed template method, described template is triblock copolymer polyoxyethylene-polyoxytrimethylene-polyoxyethylene, and described acidic aqueous solution is preferably hydrochloric acid.
According to the present invention, the kind of described acidic aqueous solution has no particular limits, and the pH value can be 1-6, and more preferably pH is 3-5.
According to the present invention, in preparation sphericity mesoporous silicon dioxide process, count in molar ratio, polyoxyethylene-polyoxytrimethylene-polyoxyethylene: N, dinethylformamide: water: HCl=1: 300-700: 10000-20000: 100-500, be preferably 1: 550-650: 10000-13000: 150-480 is particularly preferably 1: 596: 11411: 326.The weight ratio of described tetraethoxy and silica gel can be 3-6: 1, be preferably 4-5: and 1, more preferably 4.45: 1.Wherein, the mole number of polyoxyethylene-polyoxytrimethylene-polyoxyethylene calculates according to the molecular-weight average of polyoxyethylene-polyoxytrimethylene-polyoxyethylene.
The condition of described the first contact comprises: temperature is 25-60 ℃, is preferably 30-50 ℃, and the time is 1-2 hour; The condition of described the second contact comprises: temperature is 25-60 ℃, and the time is 0.1-0.3 hour.
Described crystallization condition comprises: crystallization temperature can be 90-180 ℃, is preferably 140-160 ℃; Crystallization time can be 10-40 hour, is preferably 15-30 hour; The condition of described removed template method comprises that temperature can be 250-800 ℃, is preferably 300-600 ℃; Time can be 10-40 hour, is preferably 15-35 hour.
Described template can be the conventional various triblock copolymer polyoxyethylene-polyoxytrimethylenes that use in this area-polyoxyethylene template, for example can be the template of commodity P123 by name.
According to the present invention, the various silica gel that described silica gel can be used for carrier for olefin polymerization catalyst, described silica gel be chosen as general knowledge well known in the art, do not repeat them here, for example can select the trade mark is the silica gel of ES955.
Kind and the content of described carrier, alkylaluminoxane and metallocene compound are described above, do not repeat them here.
Aforesaid method is by adding silica gel before crystallization, and adopt tetraethoxy as the silicon source, be equipped with polyoxyethylene-polyoxytrimethylene-polyoxyethylene template, so that the coated with silica that teos hydrolysis produces consists of sphericity mesoporous silicon dioxide jointly at Silica Surface.
According to the present invention, described carried metallocene catalyst can pass through under protection of inert gas, successively load alkylaluminoxane/magnesium chloride complex compound and metallocene compound on carrier.The content of described alkylaluminoxane/magnesium chloride complex compound and metallocene compound load on described carrier satisfies previously described requirement and gets final product.According to the present invention, described alkylaluminoxane/magnesium chloride complex compound and the charge capacity of metallocene compound on described carrier are take the total amount of described carried metallocene catalyst as benchmark, the total content of described metallocene compound and alkylaluminoxane/magnesium chloride complex compound can be the 10-60 % by weight, be preferably the 45-55 % by weight, more preferably the 48-52 % by weight most preferably is 48.8 % by weight; The content of described carrier can be the 40-90 % by weight, is preferably the 45-55 % by weight, and more preferably the 48-52 % by weight most preferably is 51.2 % by weight.Take the total amount of described alkylaluminoxane/magnesium chloride complex compound as benchmark, the content of described alkylaluminoxane is the 1-50 % by weight, is preferably the 15-45 % by weight, and more preferably the 30-40 % by weight most preferably is 33.33 % by weight; The content of described magnesium chloride is the 50-99 % by weight, is preferably the 55-85 % by weight, and more preferably the 60-70 % by weight most preferably is 66.67 % by weight.
According to the present invention, the alkylaluminoxane in described alkylaluminoxane/magnesium chloride complex compound and the ratio between the metallocene compound can be the known ratio of the technician of field of olefin polymerisation.Particularly, the aluminium in described alkylaluminoxane/magnesium chloride complex compound and the mol ratio of the M in the described metallocene compound can be 50-200: 1, be preferably 110-150: and 1,120-140 more preferably: 1, most preferably be 130: 1.
According to the present invention; described alkylaluminoxane/magnesium chloride complex compound is the magnesium chloride that the load aluminum alkyls is supported alkane; can prepare by following method: under protection of inert gas and/or under the air tight condition, be 15-100 ℃ of lower ball milling 0.1-100 hour with Magnesium Chloride Anhydrous and alkylaluminoxane in temperature.
According to the present invention, kind and the content of described carrier, alkylaluminoxane/magnesium chloride complex compound and metallocene compound are described above, do not repeat them here.
According to the present invention, can adopt the method for well known to a person skilled in the art that alkylaluminoxane/magnesium chloride complex compound and metallocene compound are loaded on the described carrier.Preferably, successively the method at load alkylaluminoxane/magnesium chloride complex compound and metallocene compound on the carrier comprises: under protection of inert gas, be 15-100 ℃ of lower ball milling 0.1-100 hour with Magnesium Chloride Anhydrous and alkylaluminoxane in temperature, then under protection of inert gas, carrier and the first solution are carried out the 3rd to be contacted, obtain the 3rd the contact after carrier, described the first solution contains ball milling products therefrom and the first solvent; Remove the 3rd the contact after carrier on the first solvent; The carrier that has removed the first solvent is carried out the 4th with the second solution contacts, obtain the 4th the contact after carrier, described the second solution contains described metallocene compound and the second solvent, and then removes the second solvent.
According to the present invention, described the first solvent and the second solvent are organic solvent, can respectively do for oneself in hexane, pentane, heptane, benzene and the toluene one or more of described organic solvent; Described the first solvent and the second solvent can be identical or different, are preferably toluene.
According to the present invention, carry out the second method that contacts with the second solution and be not particularly limited for described carrier and the first solution being carried out the first carrier that contacts and will remove described the first solvent, can be for well known to a person skilled in the art the whole bag of tricks, for example: dipping, spraying.Adopt the method for dipping can be so that solution enters in the duct on the carrier more fully, therefore, the present invention be preferably flooded.
According to the present invention, carrier and the first solution are carried out the 3rd to be contacted with the second solution the 4th condition that contacts of carrying out and is not particularly limited, for example: carrier carries out the 3rd condition that contacts with described the first solution and can comprise: the time is 1-10 hour, and temperature is 25-80 ℃; The described carrier that has removed the first solvent is carried out the 4th condition that contacts with described the second solution can be comprised: the time is 0.3-2 hour, and temperature is 25-80 ℃.
According to the present invention, when described the first solvent and/or the second solvent are toluene, toluene preferably adopts the method that well known to a person skilled in the art to make with extra care before use, for example: can be by toluene was made with extra care on sodium in backflow 24-48 hour, with impurity such as water in the desolventizing.
The method according to this invention also be included in carrier and the first solution carry out first contact before; under protection of inert gas; described sphericity mesoporous silicon dioxide was heated 7-10 hour under 300-900 ℃ temperature; with the volatile matter that contains in the hydroxyl of removing carrier surface and the carrier (for example: water), obtain the sphericity mesoporous silicon dioxide after the thermal activation.
According to the present invention, chemically interactive various gas can not occur with carrier, alkylaluminoxane, magnesium chloride, alkylaluminoxane/magnesium chloride complex compound, metallocene compound for various in described rare gas element.For example, described rare gas element can be nitrogen, argon gas.
According to the present invention, the preparation method of described carried metallocene catalyst, for example: can may further comprise the steps:
The 1st step with triblock copolymer polyoxyethylene-polyoxytrimethylene-polyoxyethylene and DMF, joined the pH value in the aqueous hydrochloric acid of 1-6, by the mole feed ratio,
The mol ratio of triblock copolymer polyoxyethylene-polyoxytrimethylene-polyoxyethylene, DMF, water, hydrogenchloride is 1: 300-700: 10000-20000: 100-500.
Under 25-60 ℃ of temperature, be stirred to dissolving;
The 2nd step added tetraethoxy in previous step gained solution, stir 1-2 hour to dissolving under 25-60 ℃ of temperature; The industrial ES955 silica gel of rear adding stirs 0.1-0.3 hour to dissolving under 25-60 ℃ of temperature;
The 3rd step placed closed reactor with previous step gained solution, under 90-180 ℃ of temperature crystallization 10-40 hour, with the filtration of crystallization after product, washing, drying, obtained the former powder of sphericity mesoporous silicon dioxide;
The 4th step, with the former powder of previous step gained sphericity mesoporous silicon dioxide in retort furnace at 300-800 ℃ of temperature lower calcination 10-40 hour, removed template method obtains the sphericity mesoporous silicon dioxide of removed template method;
In the 5th step, previous step gained sphericity mesoporous silicon dioxide under nitrogen protection, in 300-900 ℃ of calcining thermal activation in 7-10 hour, is obtained the sphericity mesoporous silicon dioxide after the thermal activation;
The 6th step, with anhydrous chlorides of rase magnesium carrier and solid alkylaluminoxane powder, under rare gas element such as nitrogen protection, together join and grind in the still, after the sealing still is encased in the ball mill, be under 15-100 ℃ in temperature, with 200-1000 rev/min rotating speed continuously grinding reaction 0.1-100 hour, under nitrogen protection, take out pressed powder, with this pressed powder solvent wash, dry up with rare gas element such as nitrogen at last, namely obtain alkylaluminoxane/magnesium chloride complex compound, the described solvent that wherein is used for washing can be hexane, pentane, heptane, in benzene and the toluene one or more;
The 7th step was preferably sphericity mesoporous silicon dioxide through the sphericity mesoporous silicon dioxide after the thermal activation and alkylaluminoxane/magnesium chloride complex compound and is transferred in the reaction vessel after nitrogen is fully replaced, added organic solvent, was preferably toluene, stirred and made slurries; In the container of crossing with nitrogen replacement in advance, solution is made in the metallocene compound dissolving, count in molar ratio, sphericity mesoporous silicon dioxide (in silicon-dioxide): toluene: alkylaluminoxane/magnesium chloride complex compound (take the aluminium content meter): the amount ratio of metallocene compound is 1: 3-10: 0.1-1: 1 * 10
-3-9 * 10
-3, under 25 to 80 ℃ of agitation conditions, slowly metallocene compound solution being added drop-wise in the reactor, stirring reaction 0.3-2 hour, reaction was left standstill after finishing, and leaches liquid, uses toluene wash, dries up with nitrogen, obtains carried metallocene catalyst.
According to the present invention, the temperature range that described anhydrous chlorides of rase magnesium carrier and solid alkylaluminoxane powder grind altogether is preferably 25-50 ℃, and milling time is preferably 0.4-72 hour altogether.
According to the present invention, temperature of reaction is preferably 25-80 ℃ when dripping metallocene compound, and the reaction times is preferably 0.3-2 hour.
Need to prove that when reaction raw materials adopted the mode that drips to carry out, the described time was from beginning to drip the beginning timing.
Wherein the molecular weight of alkylaluminoxane is in RAlO, and wherein R is alkyl, and for example the molecular weight of methylaluminoxane is with CH
3The AlO meter is 58.
According to olefine polymerizing process of the present invention, because the present invention is the efficient by improving polyreaction with described carried metallocene catalyst, so the present invention is not particularly limited for described olefinic polymerization condition.Can be the known polymerizing condition of the technician of field of olefin polymerisation.Preferably, in metallocene compound, the concentration of described carried metallocene catalyst can be 1 * 10
-8Mol/L-1 * 10
-3Mol/L, preferred concentration range for are 1 * 10
-8Mol/L-1 * 10
-5Mol/L.
Polymerization temperature is-78 ℃ to 100 ℃, is preferably 0-90 ℃, more preferably 70 ℃.
Polymerization pressure is 0.01-10.0MPa, preferred 0.01-2.0MPa, more preferably 1.0MPa.
According to olefine polymerizing process of the present invention, described one or more alkene can carry out in the presence of solvent with contacting of described carried metallocene catalyst.Described solvent is preferably and replaces or unsubstituted alkane or replacement or unsubstituted aromatic hydrocarbons.When described alkane and aromatic hydrocarbons had substituting group, described substituting group was preferably halogen.More preferably, described solvent is one or more in hexane, pentane, heptane, benzene, toluene, methylene dichloride, chloroform and the methylene dichloride, most preferably is in hexane, toluene and the heptane one or more.
The consumption of described solvent can carry out appropriate selection according to concrete use occasion.Preferably, the consumption of described solvent is so that the concentration of described carried metallocene catalyst is 1 * 10
-8-1 * 10
-3Mol/L is preferably 1 * 10
-8-1 * 10
-5Mol/L.
According to olefine polymerizing process of the present invention, described one or more alkene carry out in the presence of the solution that contains aluminum alkyls and/or alkylaluminoxane with contacting preferably of described carried metallocene catalyst.That is, according to olefine polymerizing process of the present invention, preferably when carrying out polymerization, in reaction system, replenish the solution that interpolation contains aluminum alkyls and/or alkylaluminoxane.Be in aluminum alkyls in the solution and/or alkylaluminoxane on loading on described carrier alkylaluminoxane/the magnesium chloride complex compound plays the effect of cleaning reaction poisonous substance, thereby so that the metallocene compound that loads on the described carrier can be brought into play katalysis better.
According to olefine polymerizing process of the present invention, when described one or more alkene carried out in the presence of the solution that is containing aluminum alkyls and/or alkylaluminoxane with contacting of described carried metallocene catalyst, whole aluminium and the mol ratio of the M in the described metallocene compound can be 100-3000 in described aluminum alkyls and the described alkylaluminoxane (comprise the alkylaluminoxane that loads on the described carrier/magnesium chloride complex compound and be in alkylaluminoxane in the solution): 1.
According to the present invention, described aluminum alkyls can be the known various aluminum alkylss that are used as the promotor of metallocene catalyst of the technician of field of olefin polymerisation; Preferably, the alkyl in the described aluminum alkyls can be C
1-C
5Alkyl; More preferably, the aluminum alkyls as promotor can be trimethyl aluminium, triethyl aluminum, tri-propyl aluminum, tri-butyl aluminum, triisopropylaluminiuand, triisobutyl aluminium, tri-tert aluminium, three amyl group aluminium, three hexyl aluminium, trioctylaluminum, aluminium diethyl monochloride, ethyl aluminum dichloride etc.; Further be preferably triethyl aluminum.
According to the present invention, when polymerization, promotor and described carried metallocene catalyst can together join to use or add in the polymerization reactor respectively in the polymerization reactor and use.Wherein, the employed solvent of polymerization is selected from alkane, aromatic hydrocarbon or halohydrocarbon.A kind of in preferred hexane, pentane, heptane, benzene, toluene, methylene dichloride, chloroform, the ethylene dichloride or their mixture most preferably are a kind of in hexane, toluene, the heptane or their mixture.
The alkylaluminoxane that is in the solution can be identical with the kind that loads on alkylaluminoxane on the described carrier (that is, replenishing the alkylaluminoxane that the alkylaluminoxane that adds and described carried metallocene catalyst contain), also can difference; Be preferably identical.
According to olefine polymerizing process of the present invention, can be polymerization or the copolymerization of alkene, particularly ethylene homo closes or the copolymerization of ethene and other alpha-olefin, and wherein alpha-olefin adopts propylene, butylene, amylene, hexene, octene, 4-methylpentene-1 etc.
The present invention is the structure of carried metallocene catalyst by the carrier of X-ray diffraction method, nitrogen adsorption desorption method and the scanning electron microscope method alkylaluminoxane/magnesium chloride complex compound of having measured or characterized carrier HS and load and metallocene compound, measures the content of aluminium and metal M in the carried metallocene catalyst by ultimate analysis.
Below in conjunction with preparation example the present invention is further specified.
The present invention is the structure of carried metallocene catalyst by the carrier of X-ray diffraction method, nitrogen adsorption desorption method and the scanning electron microscope method alkylaluminoxane/magnesium chloride complex compound of having measured or characterized carrier KK-SBA and load and metallocene compound, measures the content of aluminium and metal M in the carried metallocene catalyst by ultimate analysis.
In the following preparation example, X-ray diffraction analysis is that the X-ray diffractometer of D8 Advance carries out in the model available from German Bruker AXS company; Scanning electron microscope analysis is that the scanning electronic microscope of XL-30 is carried out in the model available from U.S. FEI Co.; Ultimate analysis is that the 7500CX instrument carries out in the model available from U.S. An Jielun company; Nitrogen adsorption-desorption experiment condition comprises: the U.S. Autosorb-1 of Kang Ta company nitrogen adsorption desorption instrument, sample is degassed 4 hours at 200 ℃.
In the following preparation example, (Aldrich company P123), is the material of 9003-11-6 in the registration number of U.S. chemical abstract to triblock copolymer polyoxyethylene-polyoxytrimethylene-polyoxyethylene, its average molecular mass Mn=5800; Methylaluminoxane is available from the U.S. refined treasured (Albemarle) company; Two (n-butyl cyclopentadienyl) zirconium dichlorides of described metallocene compound are purchased the company from Aldrich.
Preparation example 1
This preparation example is used for explanation according to carried metallocene catalyst of the present invention and preparation method thereof.
With 2.0 gram triblock copolymer polyoxyethylene-polyoxytrimethylene-polyoxyethylene (Aldrich companies, P123) and 15 the gram N, it is in the solution (pH=4.4) of the hydrochloric acid of 37 % by weight and 64ml water that dinethylformamide (DMF) joins 11.2 gram concentration, being stirred to polyoxyethylene-polyoxytrimethylene-polyoxyethylene under 40 ℃ dissolves fully, tetraethoxy with 4.45g joins in the mentioned solution afterwards, 40 ℃ were stirred after 1 hour, add again the industrial ES955 silica gel of 1 gram, 40 ℃ were stirred after 0.3 hour, again solution is transferred in the teflon-lined reactor, 150 ℃ of lower baking oven crystallization after 24 hours through filtering, distilled water wash, obtain the former powder of sphericity mesoporous silicon dioxide after the drying.
With the former powder of previous step gained sphericity mesoporous silicon dioxide in retort furnace 600 ℃ of temperature lower calcinations 24 hours, removed template method obtains the sphericity mesoporous silicon dioxide of removed template method.
With the 600 ℃ of calcinings 10 hours under nitrogen protection of the sphericity mesoporous silicon dioxide of above-mentioned removed template method, removing hydroxyl and remaining moisture, thereby obtain the sphericity mesoporous silicon dioxide (called after GJ-MBQ) through thermal activation.
Under anhydrous and oxygen-free, take by weighing 7.0g Magnesium Chloride Anhydrous and 3.5g methylaluminoxane solid and together join in the grinding still, after the sealing still is encased in the ball mill, with 400 rev/mins rotating speed continuously grindings reactions 12 hours.After grinding stops, the solid product that grinds is transferred in 250 milliliters of glass reactors after nitrogen is fully replaced, adds 30 milliliters of refining toluene, wash 3 times each 30 minutes in 30 ℃ of stirrings.After complete, use again 40 milliliters of hexane washed twice, at last solid is dried up with nitrogen, obtain having the alkylaluminoxane of good flowability/magnesium chloride complex compound; Calculate according to feed ratio, take the total amount of described alkylaluminoxane/magnesium chloride complex compound as benchmark, the content of described alkylaluminoxane is 66.67 % by weight, and the content of described magnesium chloride is 33.33 % by weight.
Under nitrogen protection; the 0.1 sphericity mesoporous silicon dioxide GJ-MBQ of gram after the thermal activation is transferred in 250 milliliters of glass reactors after nitrogen is fully replaced; alkylaluminoxane/magnesium chloride complex compound 0.1 gram joins in the reactor; add 5 milliliters of refining toluene; slurries are made in stirring; under 30 ℃, slowly drip 5 milliliters of the toluene solutions of two (n-butyl cyclopentadienyl) zirconium dichlorides of metallocene compound that contain 4.9 milligrams, stirring reaction 1 hour.After reaction finishes, leave standstill, leach liquid, with 10 milliliters of toluene wash 2 times, solid is dried up with nitrogen, obtain target product carried metallocene catalyst 0.2049 gram, and with the supported catalyst called after GJ-MBQ-Mg-BU of gained, wherein calculate according to the weight of the weight/carried metallocene catalyst of the carrier of the content of carrier=adding * 100%, take the total amount of described carried metallocene catalyst as benchmark, the total content of described metallocene compound and alkylaluminoxane/magnesium chloride complex compound is 51.2 % by weight, and the content of described carrier is 48.8 % by weight.
Come this carried metallocene catalyst is characterized with XRD, nitrogen adsorption-desorption experiment, scanning electron microscope, X-ray energy spectrometer and ICP ultimate analysis.
Fig. 1 is X-ray diffracting spectrum,, the X-ray diffraction curve of GJ-MBQ can find out significantly that from XRD spectra GJ-MBQ a diffraction peak occurs in little angular region shown in indicating among the figure.Illustrate that GJ-MBQ has good mesoporous phase structure (concrete data provide) in table 1.
Fig. 2 is X-ray diffracting spectrum, and the X-ray diffraction curve of GJ-MBQ-Mg-BU can find out significantly that from XRD spectra GJ-MBQ-Mg-BU a diffraction peak occurs in little angular region shown in indicating among the figure.Illustrate that GJ-MBQ-Mg-BU has good mesoporous phase structure (concrete data provide) in table 1.
Fig. 3 is nitrogen adsorption-desorption graphic representation, and wherein, X-coordinate is relative pressure, and unit is p/p
0, the adsorption desorption curve of GJ-MBQ and GJ-MBQ-Mg-BU is shown in indicating among the figure.Can find out that GJ-MBQ and GJ-MBQ-Mg-BU are the IV class adsorption-desorption thermoisopleths of typical IUPAC definition, this thermoisopleth has H
1Hysteresis loop, this shows that GJ-MBQ and GJ-MBQ-Mg-BU have the meso-hole structure of bibliographical information.
Fig. 4 is graph of pore diameter distribution, and wherein, X-coordinate is the aperture, and unit is nm, and a is the graph of pore diameter distribution of GJ-MBQ, and b is the graph of pore diameter distribution of GJ-MBQ-Mg-BU.Can find out the GJ-MBQ even aperture distribution, same GJ-MBQ-Mg-BU pore size distribution also is very even.
Fig. 5 is stereoscan photograph, wherein, and a
1And a
2(be a
1Partial enlarged drawing) be the stereoscan photograph of GJ-MBQ, b
1And b
2Stereoscan photograph for GJ-MBQ-Mg-BU; Stereoscan photograph has shown the microscopic appearance of each material.As shown in Figure 5, the microscopic appearance of GJ-MBQ and GJ-MBQ-Mg-BU is sphere, size is micron level, is that the spherical morphology of GJ-MBQ-Mg-BU remains unchanged substantially behind the process load-reaction, still keeps preferably spherical (concrete data provide in table 1).
Table 1
Data from table 1 can find out that the pore structure parameter of GJ-MBQ-Mg-BU all decreases than GJ-MBQ, show that methylaluminoxane/magnesium chloride complex compound and metallocene compound enter into the duct of GJ-MBQ really.
Results of elemental analyses shows that the aluminium content among the GJ-MBQ-Mg-BU is 8 % by weight, and the content of Zr is 0.2 % by weight, and the mol ratio of Al/Zr is 130: 1.
Present embodiment is used for illustrating olefine polymerizing process of the present invention.
In 2 liters stainless steel polymermaking autoclave, respectively replace three times with nitrogen and ethene, then add 200 milliliters of hexane solvents, with still temperature rise to 70 ℃, add again 800 milliliters of hexane solvents, along with the adding of hexane, triethyl aluminum (TEA) hexane solution of 2 milliliter of 1 mol/L is added, then add the GJ-MBQ-Mg-BU of 102 milligrams of preparation examples, 1 preparation, pressure is risen to and keeps 1.0MPa, 70 ℃ of reactions 1 hour.After polyreaction finished, catalytic efficiency was 2.3 * 10
8GPE/ (mol Zrh), bulk density (BD) is 0.3g/ml, melting index: MI
2.16=0.004g/10min.
Present embodiment is used for illustrating olefine polymerizing process of the present invention.
In 2 liters stainless steel polymermaking autoclave, respectively replace three times with nitrogen and ethene, then add 200 milliliters of hexane solvents, with still temperature rise to 70 ℃, add again 800 milliliters of hexane solvents, along with the adding of hexane, triethyl aluminum (TEA) hexane solution and 10 milliliters of hexenes of 2 milliliter of 1 mol/L are added, then add the GJ-MBQ-Mg-BU of 80 milligrams of preparation examples, 1 preparation, pressure is risen to and keeps 1.0MPa, 70 ℃ of reactions 1 hour.After polyreaction finished, catalytic efficiency was 2.2 * 10
8GPE/ (molZrh), bulk density (BD) is 0.27g/ml, melting index: MI
2.16=0.27g/10min.
Preparation Comparative Examples 1
This preparation Comparative Examples is used for preparation and the application thereof of two (n-butyl cyclopentadienyl) zirconium dichlorides (BUCP) of explanation alkylaluminoxane/carrier loaded metallocene compound of magnesium chloride complex compound
Under nitrogen protection, take by weighing the pretreated Magnesium Chloride Anhydrous of 7.0g and 3.5g methylaluminoxane solid and together join in the grinding still, after the sealing still is encased in the ball mill, with 400 rev/mins rotating speed continuously grindings reactions 12 hours.After grinding stops, the solid product that grinds is transferred in 250 milliliters of glass reactors after nitrogen is fully replaced, adds 30 milliliters of refining toluene, wash three times each 30 minutes in 30 ℃ of stirrings.After complete, use again 40 milliliters of hexane washed twice, at last solid is dried up with nitrogen, obtain having the alkylaluminoxane of good flowability/magnesium chloride complex compound;
Under nitrogen protection; alkylaluminoxane/magnesium chloride complex compound 0.1 is restrained in 250 milliliters of glass reactors that join after nitrogen is fully replaced; add 5 milliliters of refining toluene; slurries are made in stirring; under 30 ℃; slowly drip 5 milliliters of the toluene solutions of two (n-butyl cyclopentadienyl) zirconium dichlorides of metallocene compound that contain 4.9 milligrams, stirring reaction 1 hour.After reaction finishes, leave standstill, leach liquid, with 10 milliliters of toluene wash 2 times, solid is dried up with nitrogen, obtain catalyzer and with the supported catalyst called after Mg-BU of gained.
Show by ultimate analysis ICP result, the aluminium content of two (n-butyl cyclopentadienyl) zirconium dichlorides (BUCP) of alkylaluminoxane/carrier loaded metallocene compound of magnesium chloride complex compound is 12.2 % by weight, the content of Zr is 0.44 % by weight, and the mol ratio of Al/Zr is 93: 1.
Comparative Examples 1
This Comparative Examples is used for the catalyzer of explanation preparation Comparative Examples 1 preparation in the application of olefinic polymerization
Method according to embodiment 1 is carried out polyreaction, and different is, the GJ-MBQ-Mg-BU of preparation example 1 preparation is replaced by the Mg-BU of preparation Comparative Examples 1 preparation of identical weight, and catalytic efficiency is 1.2 * 10 as a result
8GPE/ (mol Zrh)), bulk density (BD) is 0.277g/ml, melting index: MI
2.16=0.083g/10min.And observe and find the serious sticking still phenomenon of appearance in the polymerization reaction kettle, need to use sharp weapon will scrape in the reactor totally.
Comparative Examples 2
This Comparative Examples is used for the catalyzer of explanation preparation Comparative Examples 1 preparation in the application of olefinic polymerization
Method according to embodiment 2 is carried out polyreaction, and different is, the GJ-MBQ-Mg-BU of preparation example 1 preparation is replaced by the Mg-BU of preparation Comparative Examples 1 preparation of identical weight, and catalytic efficiency is 8.1 * 10 as a result
7GPE/ (mol Zrh)), bulk density (BD) is 0.221g/ml, melting index: MI
2.16=0.269g/10min.And observe and find the serious sticking still phenomenon of appearance in the polymerization reaction kettle, need to use sharp weapon will scrape in the reactor totally.
Preparation Comparative Examples 2
This preparation Comparative Examples is used for preparation and the application thereof of explanation sphericity mesoporous silicon dioxide load methylaluminoxane and two (n-butyl cyclopentadienyl) zirconium dichlorides of metallocene compound
With 4.0 gram triblock copolymer polyoxyethylene-polyoxytrimethylene-polyoxyethylene (Aldrich companies, P123) and join in the solution (pH=4.4) of 37% 16.4ml hydrochloric acid and 128ml water, being stirred to polyoxyethylene-polyoxytrimethylene-polyoxyethylene under 40 ℃ dissolves fully, tetraethoxy with 8.86g joins in the mentioned solution afterwards, 40 ℃ were stirred after 24 hours, again solution is transferred in the teflon-lined reactor, 150 ℃ of lower baking oven crystallization after 24 hours through filtering, distilled water wash, obtain the former powder of sphericity mesoporous silicon dioxide after the drying.
With the former powder of previous step gained sphericity mesoporous silicon dioxide in retort furnace 600 ℃ of temperature lower calcinations 24 hours, removed template method obtains the sphericity mesoporous silicon dioxide of removed template method.
With the 400 ℃ of calcinings 10 hours under nitrogen protection of the sphericity mesoporous silicon dioxide of above-mentioned removed template method, removing hydroxyl and remaining moisture, thereby obtain the sphericity mesoporous silicon dioxide (called after GJ-MBQ) through thermal activation.
Under nitrogen protection; the 0.1 sphericity mesoporous silicon dioxide GJ-MBQ of gram after the thermal activation is transferred in 250 milliliters of glass reactors after nitrogen is fully replaced; alkylaluminoxane 0.1 gram joins in the reactor; add 5 milliliters of refining toluene; slurries are made in stirring; under 30 ℃, slowly drip 5 milliliters of the toluene solutions of two (n-butyl cyclopentadienyl) zirconium dichlorides of metallocene compound that contain 4.9 milligrams, stirring reaction 1 hour.After reaction finishes, leave standstill, leach liquid, with 10 milliliters of toluene wash 2 times, solid is dried up with nitrogen, obtaining load has the GJ-MBQ-1 of methylaluminoxane (called after MAO/GJ-MBQ-1).
Under nitrogen protection; MAO/GJ-MBQ-1 is joined in 250 milliliters of glass reactors; add 20 milliliters of refining toluene; under 30 ℃; slowly drip two (n-butyl cyclopentadienyl) zirconium dichlorides of 28 milligrams (available from Alfa Aesar; article No. H27576), stirring reaction is 0.4 hour.After reaction finishes, leave standstill, leach liquid after the layering, with 10 milliliters of toluene wash three times, follow, with 40 milliliters of hexane washed twice, solid is dried up with nitrogen, obtain according to carried metallocene catalyst of the present invention (called after MAO/GJ-MBQ-BU-1).
Come this carried metallocene catalyst is characterized with XRD, nitrogen adsorption-desorption experiment, scanning electron microscope, X-ray energy spectrometer and ICP ultimate analysis.Table 2 is the pore structure parameter of sphericity mesoporous silicon dioxide carrier GJ-MBQ and carried metallocene catalyst MAO/GJ-MBQ-BU-1,
Table 2
Data by upper table 2 can be found out, sphericity mesoporous silicon dioxide carrier GJ-MBQ is behind load methylaluminoxane and metallocene, pore volume, specific surface area and aperture all reduce to some extent, and this explanation metallocene in the load-reaction process enters into the spheroid inside of coarse pored mesoporous material.
Ultimate analysis ICP result shows, load the aluminium content of sphericity mesoporous silicon dioxide of two (n-butyl cyclopentadienyl) zirconium dichlorides (BUCP) of methylaluminoxane (MAO) and metallocene compound be 15.6 % by weight, the content of Zr is 0.36 % by weight, and the mol ratio of Al/Zr is 204: 1.
Comparative Examples 3
This Comparative Examples is used for the catalyzer of explanation preparation Comparative Examples 2 preparations in the application of olefinic polymerization
Method according to embodiment 1 is carried out polyreaction, and different is, the GJ-MBQ-Mg-BU of preparation example 1 preparation is replaced by the catalyzer MAO/GJ-MBQ-BU-1 of preparation Comparative Examples 2 preparations of identical weight, and catalytic efficiency is 6.2 * 10 as a result
7G PE/ (mol Zr h), bulk density (BD) is 0.317g/ml, melting index MI
2.16=0.051g/10min, and observe and find the serious sticking still phenomenon of appearance in the polymerization reaction kettle, need to use sharp weapon will scrape in the reactor totally.
Comparative Examples 4
This Comparative Examples is used for the catalyzer of explanation preparation Comparative Examples 2 preparations in the application of olefinic polymerization
Method according to embodiment 2 is carried out polyreaction, and different is, the GJ-MBQ-Mg-BU of preparation example 1 preparation is replaced by the catalyzer MAO/GJ-MBQ-BU-1 of preparation Comparative Examples 2 preparations of identical weight, and catalytic efficiency is 5.7 * 10 as a result
7G PE/ (mol Zr h), bulk density (BD) is 0.311g/ml, melting index MI
2.16=0.339g/10min.And observe and find the serious sticking still phenomenon of appearance in the polymerization reaction kettle, need to use sharp weapon will scrape in the reactor totally.
Preparation Comparative Examples 3
This preparation Comparative Examples is used for preparation and the application thereof of explanation ES955 silica gel load methylaluminoxane/magnesium chloride and two (n-butyl cyclopentadienyl) zirconium dichlorides of metallocene compound
Under the anhydrous and oxygen-free condition, take by weighing the pretreated Magnesium Chloride Anhydrous of 7.0g and 3.5g methylaluminoxane solid and together join in the grinding still, after the sealing still is encased in the ball mill, with 400 rev/mins rotating speed continuously grindings reactions 12 hours.After grinding stops, the solid product that grinds is transferred in 250 milliliters of glass reactors after nitrogen is fully replaced, adds 30 milliliters of refining toluene, wash three times each 30 minutes in 30 ℃ of stirrings.After complete, use again 40 milliliters of hexane washed twice, at last solid is dried up with nitrogen, obtain having the alkylaluminoxane of good flowability/magnesium chloride complex compound;
Under nitrogen protection; industrial ES955 silica gel 0.1 after the thermal activation is restrained in 250 milliliters of glass reactors that are transferred to after nitrogen is fully replaced; alkylaluminoxane/magnesium chloride complex compound 0.1 gram joins in the reactor; add 5 milliliters of refining toluene; slurries are made in stirring; under 30 ℃, slowly drip two (n-butyl cyclopentadienyl) zirconium dichlorides of the metallocene catalyst precursors that contains 4.9 milligrams) 5 milliliters of toluene solutions, stirring reaction 1 hour.After reaction finishes, leave standstill, leach liquid, with 10 milliliters of toluene wash 2 times, solid is dried up with nitrogen, obtain catalyzer and with the supported catalyst called after 955GJ-Mg-BU of gained.
Results of elemental analyses shows, the aluminium content among the 955GJ-Mg-BU is that the content of 13.0%, Zr is that the mol ratio of 0.50%, Al/Zr is 88: 1.
Comparative Examples 5
This Comparative Examples is used for the catalyzer of explanation preparation Comparative Examples 3 preparations in the application of olefinic polymerization
Method according to embodiment 1 is carried out polyreaction, and different is, the GJ-MBQ-Mg-BU of preparation example 1 preparation is replaced by the catalyzer 955GJ-Mg-BU of preparation Comparative Examples 3 preparations of identical weight, and catalytic efficiency is 5.9 * 10 as a result
7GPE/ (mol Zr h)), bulk density (BD) is 0.23g/ml, melting index: MI
2.16=0.06g/10min.And observe and find the serious sticking still phenomenon of appearance in the polymerization reaction kettle, need to use sharp weapon will scrape in the reactor totally.
Comparative Examples 6
This Comparative Examples is used for the catalyzer of explanation preparation Comparative Examples 3 preparations in the application of olefinic polymerization
Method according to embodiment 2 is carried out polyreaction, and different is, the GJ-MBQ-Mg-BU of preparation example 1 preparation is replaced by the catalyzer 955GJ-Mg-BU of preparation Comparative Examples 3 preparations of identical weight, and catalytic efficiency is 2.0 * 10 as a result
7GPE/ (mol Zr h)), bulk density (BD) is 0.20g/ml, melting index: MI
2.16=0.15g/10min.And observe and find the serious sticking still phenomenon of appearance in the polymerization reaction kettle, need to use sharp weapon will scrape in the reactor totally.
Preparation Comparative Examples 4
This preparation Comparative Examples is used for preparation and the application thereof of explanation ES955 silica gel load methylaluminoxane and two (n-butyl cyclopentadienyl) zirconium dichlorides of metallocene compound
With the 400 ℃ of calcinings 10 hours under nitrogen protection of ES955 silica gel, removing hydroxyl and remaining moisture, thereby obtain the silica gel through the ES955 of thermal activation.
Under nitrogen protection; 0.9 gram ES955 silica gel is joined in 250 milliliters of glass reactors; add again 1.0 gram methylaluminoxane and 10mL toluene; under 50 ℃ of conditions; behind the stirring reaction 4 hours, use toluene wash 3 times, again with 20 milliliters of hexanes washings three times; at last solid is dried up with nitrogen, obtaining load has the ES955 of methylaluminoxane (called after MAO/ES955).
Under nitrogen protection; MAO/ES955 is joined in 250 milliliters of glass reactors, add 20 milliliters of refining toluene (refluxing 24 hours with sodium), under 30 ℃; slowly drip two (normal-butyl-cyclopentadienyl) zirconium dichlorides of metallocene compound of 44 milligrams, stirring reaction 0.5 hour.After reaction finishes, leave standstill, leach liquid, with 10 milliliters of toluene wash three times, follow, with 40 milliliters of hexane washed twice, solid is dried up with nitrogen, obtain carried metallocene catalyst (called after MAO/ES955-BU).
Results of elemental analyses shows that the content of the aluminium among the MAO/ES955-BU is 32.4 % by weight, and the content of Zr is 0.41 % by weight, and the mol ratio of Al/Zr is 270: 1.
Comparative Examples 7
This Comparative Examples is used for the catalyzer of explanation preparation Comparative Examples 4 preparations in the application of olefinic polymerization
Method according to embodiment 1 is carried out polyreaction, and different is, the GJ-MBQ-Mg-BU of preparation example 1 preparation is replaced by the catalyzer MAO/ES955-BU of preparation Comparative Examples 4 preparations of identical weight, and catalytic efficiency is 2.9 * 10 as a result
7GPE/ (mol Zr h)), melting index: MI
2.16=0.119g/10min.Determine as calculated.And observe and find the serious sticking still phenomenon of appearance in the polymerization reaction kettle, need to use sharp weapon will scrape in the reactor totally.
Comparative Examples 8
This Comparative Examples is used for the catalyzer of explanation preparation Comparative Examples 4 preparations in the application of olefinic polymerization
Method according to embodiment 2 is carried out polyreaction, and different is, the GJ-MBQ-Mg-BU of preparation example 1 preparation is replaced by the catalyzer MAO/ES955-BU of preparation Comparative Examples 4 preparations of identical weight, and catalytic efficiency is 2.7 * 10 as a result
7GPE/ (mol Zr h)), the density of polymer stacks (BD) is 0.299g/ml, and melting index is MI
2.16=0.679g/10min.Determine as calculated.And observe and find the serious sticking still phenomenon of appearance in the polymerization reaction kettle, need to use sharp weapon will scrape in the reactor totally.
The polymerization result of embodiment 1-2 and Comparative Examples 1-8 is compared and can find out, only have when containing at the same time alkylaluminoxane, magnesium chloride, metallocene and sphericity mesoporous silicon dioxide, this catalyzer could solve the problem of the sticking still of polymerization.
Claims (13)
1. olefine polymerizing process, the method is included under the olefinic polymerization condition, one or more alkene are contacted with carried metallocene catalyst, it is characterized in that, described carried metallocene catalyst comprises carrier and loads on alkylaluminoxane on the described carrier/magnesium chloride complex compound and metallocene compound, described carrier is sphericity mesoporous silicon dioxide, the average particle diameter of described carrier is the 20-80 micron, specific surface area is the 550-650 meters squared per gram, pore volume is 0.4-1.2 ml/g, and the most probable aperture is the 1-7 nanometer; Described metallocene compound has the structure shown in the formula 1:
Formula 1
Wherein, R
1, R
2, R
3, R
4, R
5, R
1', R
2', R
3', R
4' and R
5' be hydrogen or C independently of one another
1-C
5Alkyl in a kind of, and R
1, R
2, R
3, R
4And R
5In at least one be C
1-C
5Alkyl, R
1', R
2', R
3', R
4' and R
5' at least one be C
1-C
5Alkyl; M is a kind of in titanium, zirconium and the hafnium; X is halogen.
2. method according to claim 1, wherein, take the total amount of described carried metallocene catalyst as benchmark, the total content of described metallocene compound and alkylaluminoxane/magnesium chloride complex compound is the 10-60 % by weight, and the content of described carrier is the 40-90 % by weight; Take the total amount of described alkylaluminoxane/magnesium chloride complex compound as benchmark, the content of described alkylaluminoxane is the 1-50 % by weight, and the content of described magnesium chloride is the 50-99 % by weight.
3. method according to claim 1 and 2, wherein, aluminium in described alkylaluminoxane/magnesium chloride complex compound and the mol ratio of the M in the described metallocene compound are 50-200: 1, and the aluminium in described alkylaluminoxane/magnesium chloride complex compound and the mol ratio of the M in the described metallocene compound are preferably 110-150: 1.
4. according to claim 1 or 3 described methods, wherein, M is zirconium, and X is chlorine.
5. method according to claim 1, wherein, R
1And R
1' be C independently of one another
1-C
5Alkyl, be preferably normal-butyl, and R
2, R
3, R
4, R
5, R
2', R
3', R
4' and R
5' be hydrogen.
6. the described method of any one according to claim 1-3, wherein, the alkyl in described alkylaluminoxane/magnesium chloride complex compound is C
1-C
5Alkyl, preferred described alkylaluminoxane is methylaluminoxane.
7. method according to claim 1, wherein, described metallocene compound is two (n-butyl cyclopentadienyl) zirconium dichlorides, described alkylaluminoxane is methylaluminoxane.
8. method according to claim 1, wherein, the average particle diameter of described sphericity mesoporous silicon dioxide carrier is the 20-80 micron, and specific surface area is the 580-620 meters squared per gram, and pore volume is 0.6-1.0 ml/g, and the most probable aperture is the 3-6 nanometer.
9. the described method of any one according to claim 1-8, wherein, described carrier is made by the method that may further comprise the steps: at template, N, dinethylformamide exists lower, tetraethoxy and acidic aqueous solution are carried out first to be contacted, and gained mixture after the first contact carried out second with silica gel and contact, with the mixture crystallization under crystallization condition after the second contact, the gained crystallization product is heated, removed template method, described template is triblock copolymer polyoxyethylene-polyoxytrimethylene-polyoxyethylene, and described acidic aqueous solution is hydrochloric acid.
10. method according to claim 9, wherein, the pH value of described acidic aqueous solution is 1-6; The condition of described crystallization comprises: temperature is 90-180 ℃, and the time is 10-40 hour; The condition of described removed template method comprises: temperature is 300-800 ℃, and the time is 10-40 hour; The condition of described the first contact comprises: temperature is 25-60 ℃, and the time is 1-2 hour; The condition of described the second contact comprises: temperature is 25-60 ℃, and the time is 0.1-0.3 hour.
11. method according to claim 9, wherein, count in molar ratio, triblock copolymer polyoxyethylene-polyoxytrimethylene-polyoxyethylene: N, dinethylformamide: water: hydrogenchloride=1: 300-700: 10000-20000: 100-500, described tetraethoxy: the weight ratio of silica gel is 3-6: 1.
12. method according to claim 1, wherein, described alkene is ethene and/or alpha-olefin, and described alkene is preferably ethene, and described alpha-olefin is selected from one or more in propylene, butylene, amylene, hexene, octene, the 4-methylpentene-1.
13. method according to claim 1, wherein, described contact is carried out in the presence of solvent, and described olefinic polymerization condition comprises: in metallocene compound, the concentration of described carried metallocene catalyst is 1 * 10
-8-1 * 10
-3Mol/L is preferably 1 * 10
-8-1 * 10
-5Mol/L, temperature are-78 ℃ to 100 ℃, and pressure is 0.01-10MPa.
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