CN109384863A - Polyolefin catalyst and polyolefin and their preparation method - Google Patents
Polyolefin catalyst and polyolefin and their preparation method Download PDFInfo
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- CN109384863A CN109384863A CN201710665903.5A CN201710665903A CN109384863A CN 109384863 A CN109384863 A CN 109384863A CN 201710665903 A CN201710665903 A CN 201710665903A CN 109384863 A CN109384863 A CN 109384863A
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
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Abstract
The present invention relates to homogeneous catalytic olefin polymerization technique field, a kind of polyolefin catalyst, the preparation method of the polyolefin catalyst, a kind of method of olefinic polymerization and the polyolefin being prepared by this method are disclosed.Contain carrier and load magnesium component on the carrier and/or titanium component in the polyolefin catalyst, the carrier is the composite material containing silica gel and rodlike mesopore molecular sieve, the rodlike mesopore molecular sieve has two-dimentional hexagonal hole road distributed architecture, the pore volume of the rodlike mesopore molecular sieve is 0.8-1.2mL/g, specific surface area 600-700m2/ g, average pore size 5-10nm；The specific surface area of the silica gel is 200-300m2/ g, pore volume 1-2mL/g, average pore size 10-30nm, average grain diameter are 20-100 μm.Using polyolefin catalyst provided by the invention when being used for olefin polymerization, catalytic efficiency with higher, and heap density and the lower polyolefin products of melt index can be obtained.
Description
Technical field
The present invention relates to homogeneous catalytic olefin polymerization techniques, and in particular, to a kind of polyolefin catalyst, described poly-
The preparation method of alkene catalyst, a kind of method of olefinic polymerization and the polyolefin being prepared by this method.
Background technique
The development and application of polyethylene catalysts are the olefinic polymerization catalysis after traditional Ziegler-Natta catalyst
The another important breakthrough in agent field, this makes the research of polyethylene catalysts enter a stage grown rapidly.Due to
Catalyst amount needed for homogeneous polyethylene catalyst reaches high activity is big, high production cost, and obtained polymer is without grain
Shape can not use on widely used slurry process or gas phase polymerization technique, and overcoming the effective way of the above problem is exactly handle
Soluble poly catalyst for ethylene catalyst carries out supported processing.Currently, the related supported research report of polyethylene catalysts is non-
Chang Duo.To further investigate new support/catalyst/co-catalyst system, it is necessary to different carriers is attempted, to push carrier to urge
The further development of agent and polyolefin industry.Mesoporous material is with its big surface area (500-2000m2/ g), spacious duct
And the advantage of big and adjustable aperture size (3-50nm) is loaded for polyethylene catalysts and gathered for ethylene by researcher
Close reaction.
However conventional ordered mesoporous material SBA-15 microscopic appearance is compared to be rodlike with microscopic appearance is spherical shape material
Mobility itself is poor, and big specific surface area and high hole hold cause and make it have stronger water suction, moisture absorption ability, this will be into one
Step aggravation ordered mesoporous material reunion, to ordered mesoporous material storage, transport, post-processing and application make troubles.And it is micro-
For the geometric shape of ball in the reunion for reducing powder, improving its mobility etc. has an apparent advantage, therefore by order mesoporous material
Spherical shape, which is made, in material can combine microballoon with the advantages of ordered mesoporous material, can retain the Gao Bibiao of ordered mesoporous material
The characteristics of area, macropore hold, aperture is big and narrowly distributing, and the reunion of ordered mesoporous material can be reduced, increase its mobility.This will
Better platform is provided for the application of ordered mesoporous material, and expands the application field of ordered mesoporous material.
Summary of the invention
The purpose of the invention is to overcome the existing bar-shaped ordered mesopore material flow as polyolefin catalyst carrier
Dynamic property is poor, easy to reunite, is unfavorable for it and store, transports, postorder processing and applying, and then causes by existing supported polyolefin
The defects of poor catalytic activity of the supported polyolefin catalyst of catalyst carrier preparation, provide a kind of polyolefin catalyst, institute
State the preparation method of polyolefin catalyst, a kind of method of olefinic polymerization and the polyolefin being prepared by this method.
To achieve the goals above, for the present inventor by finding after research, silica gel has the geometric shape of microballoon,
There is an apparent advantage in terms of reducing the reunion of powder, improving its, therefore by bar-shaped ordered mesopore material and microballoon
The compound composite material obtained of shape silica gel, can be the excellent of microballoon and bar-shaped ordered mesopore material as polyolefin catalyst carrier
Point combines, and can retain the high-specific surface area of bar-shaped ordered mesopore material, the characteristics of macropore holds, aperture is big and narrowly distributing,
The reunion that bar-shaped ordered mesopore material can be reduced again, increases its mobility.Using the composite material as polyolefin catalyst
Carrier can effectively improve the load factor and catalytic activity of polyolefin catalyst, so that the polyolefin catalyst made of the carrier
For can get the reaction raw materials conversion ratio significantly improved in olefin polymerization, so as to complete the present invention.
First aspect present invention provides a kind of polyolefin catalyst, contains carrier and load in the polyolefin catalyst
Magnesium component and/or titanium component on the carrier, the carrier are the composite material containing silica gel and rodlike mesopore molecular sieve,
The rodlike mesopore molecular sieve has two-dimentional hexagonal hole road distributed architecture, and the pore volume of the rodlike mesopore molecular sieve is 0.8-
1.2mL/g, specific surface area 600-700m2/ g, average pore size 5-10nm；The specific surface area of the silica gel is 200-300m2/
G, pore volume 1-2mL/g, average pore size 10-30nm, average grain diameter are 20-100 μm.
Second aspect of the present invention provides a kind of method for preparing aforementioned polyolefins catalyst, this method comprises: in inertia
In the presence of gas, carrier is subjected to impregnation in the mixed solution containing magnesium component presoma and/or titanium component presoma,
Then it is successively filtered and dries, wherein the carrier is the composite material containing silica gel and rodlike mesopore molecular sieve, described
Rodlike mesopore molecular sieve has two-dimentional hexagonal hole road distributed architecture, and the pore volume of the rodlike mesopore molecular sieve is 0.8-1.2mL/
G, specific surface area 600-700m2/ g, average pore size 5-10nm；The specific surface area of the silica gel is 200-300m2/ g, hole body
Product is 1-2mL/g, and average pore size 10-30nm, average grain diameter is 20-100 μm.
Third aspect present invention provides the polyolefin catalyst prepared by preceding method.
Fourth aspect present invention provides a kind of method of olefinic polymerization, which comprises under the polymerization conditions,
In the presence of a catalyst, olefinic monomer is made to carry out polymerization reaction, wherein the catalyst is that polyolefin provided by the present invention is urged
Polyolefin catalyst made from agent and/or method provided by the present invention.
The polyolefin that the method that fifth aspect present invention provides olefinic polymerization provided by the present invention is prepared.
The present invention utilizes aperture, pore volume and the biggish rodlike mesopore molecular sieve of specific surface area and the silicon with specific structure
The composite material that glue is formed both retained as polyolefin catalyst carrier in conjunction with the advantages of microballoon and bar-shaped ordered mesopore material
The characteristics of high-specific surface area of the rodlike mesopore molecular sieve, macropore hold, aperture is big and narrowly distributing, and can reduce described rodlike
The reunion of mesopore molecular sieve increases its mobility.And the polyolefin catalyst carrier meso-hole structure is stablized, in supported active
Orderly meso-hole structure can still be maintained after component, significantly improve efficiency and system by its loaded catalyst being prepared
The property of the polyolefin products obtained, when which is used for polymerizing olefin monomers reaction, high catalytic efficiency, and can
Specifically the load-type alkene catalyst is used with the polyolefin products that acquisition has both lower bulk density and melt index
In the reaction for carrying out olefinic polymerization, catalyst efficiency is up to 3000g PE/gcat h, the bulk density of polyolefin obtained
0.35g/mL is hereinafter, melt index is 0.8g/10min or less.
In addition, the step impregnation method that the present invention is conventional using co-impregnation method substitution, preparation process is simple, and condition is easy to
Control, good repetitiveness.
Also, carrier of the invention is only obtained for example, by mechanical mixture, is not needed using materials such as binders, thus
Avoid the defect that catalytic activity is influenced caused by having residual due to binder.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the X-ray diffracting spectrum of the rodlike mesopore molecular sieve of preparation example 1；
Fig. 2 is the SEM scanning electron microscope (SEM) photograph of the microscopic appearance of the rodlike mesopore molecular sieve of preparation example 1；
Fig. 3 is the SEM scanning electron microscope (SEM) photograph of the microscopic appearance of the ES955 silica gel of preparation example 1；
Fig. 4 is the pore size distribution curve of the composite material F1 containing rodlike mesopore molecular sieve C1 and silica gel A of preparation example 1.
Specific embodiment
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
Contain carrier the present invention provides a kind of polyolefin catalyst, in the polyolefin catalyst and is supported on the load
Magnesium component and/or titanium component on body, the carrier is the composite material containing silica gel and rodlike mesopore molecular sieve, described rodlike
Mesopore molecular sieve has two-dimentional hexagonal hole road distributed architecture, and the pore volume of the rodlike mesopore molecular sieve is 0.8-1.2mL/g, than
Surface area is 600-700m2/ g, average pore size 5-10nm；The specific surface area of the silica gel is 200-300m2/ g, pore volume are
1-2mL/g, average pore size 10-30nm, average grain diameter are 20-100 μm.
According to the present invention, the average grain diameter of the silica gel is measured using laser fineness gage, and the silica gel and stick are mesoporous
Specific surface area, pore volume and the average pore size of molecular sieve are measured according to nitrogen adsorption methods.In the present invention, partial size refers to raw material
The particle size of grain, when feed particles are sphere, then the diameter of granularity sphere is indicated, then when feed particles are cube
The side length of granularity cube indicates, when feed particles are irregular shape then granularity with the raw material can be screened out just
The mesh size of the sieve of particle indicates.
According to the present invention, by by the structural parameter control of silica gel and rodlike mesopore molecular sieve in the carrier in above-mentioned model
Within enclosing, it can be ensured that the carrier is not susceptible to reunite, and the loaded catalyst being made into can be improved alkene and gather
Close the reaction raw materials conversion ratio in reaction process.When the specific surface area of the rodlike mesopore molecular sieve is less than 600m2/ g and/or hole
When volume is less than 0.8mL/g, the catalytic activity for the loaded catalyst being made into can be significantly reduced；When described rodlike mesoporous point
The specific surface area of son sieve is greater than 700m2When/g and/or pore volume are greater than 1.2mL/g, the loaded catalyst being made into is in alkene
Reunion is easy to happen in polymerized hydrocarbon reaction process, thus the reaction raw materials conversion ratio during influencing olefin polymerization.
Under preferable case, in the carrier, the pore volume of the rodlike mesopore molecular sieve is 0.9-1.1mL/g, compares table
Area is 630-680m2/ g, average pore size 5-8nm；The specific surface area of the silica gel is 230-280m2/ g, pore volume 1.2-
1.8mL/g, average pore size 12-18nm, average grain diameter are 30-70 μm.
It is highly preferred that the content weight ratio of the rodlike mesopore molecular sieve and the silica gel is (1.2-10): 1；Further
Preferably (1.5-5): 1.
Under preferable case, the rodlike mesopore molecular sieve is SBA-15, and the silica gel is 955 silica gel.
According to the present invention, described on the basis of the total weight of the polyolefin catalyst in the polyolefin catalyst
The content of carrier can be 90-99 weight %, and the magnesium component and titanium component are aoxidized respectively with magnesium oxide and titanium elements
The sum of content of object meter can be 1-10 weight %；Preferably, the content of the carrier can be 90.5-98.5 weight %, institute
Stating the sum of the content of magnesium component and titanium component respectively in terms of magnesium oxide and titanium elements oxide can be 1.5-9.5 weight
Measure %；It is highly preferred that the content of the carrier can be 91-96 weight %, the magnesium component and titanium component are respectively with magnesium elements
The sum of content of oxide and titanium elements oxide meter can be 4-9 weight %.
According to the present invention, there is no particular limitation for the magnesium component and the type of the titanium component, can be this field
Conventional selection.For example, the magnesium component and the titanium component can be magnesium salts and titanium salt, specifically, the magnesium salts can be chlorine
Change one of magnesium, magnesium sulfate, magnesium nitrate and magnesium bromide or a variety of, preferably magnesium chloride；The titanium salt can be titanium tetrachloride
And/or titanium trichloride.
In the present invention, the content of each element can be using X-ray fluorescence spectra point in the polyolefin catalyst component
Analysis method measures.
The present invention also provides the methods for preparing aforementioned polyolefins catalyst, this method comprises: in the presence of an inert gas,
Carrier is subjected to impregnation in the mixed solution containing magnesium component presoma and/or titanium component presoma, then successively into
Row filtering and dry, wherein the carrier is the composite material containing silica gel and rodlike mesopore molecular sieve, described rodlike mesoporous point
Sub- sifter device has two-dimentional hexagonal hole road distributed architecture, and the pore volume of the rodlike mesopore molecular sieve is 0.8-1.2mL/g, specific surface area
For 600-700m2/ g, average pore size 5-10nm；The specific surface area of the silica gel is 200-300m2/ g, pore volume 1-2mL/
G, average pore size 10-30nm, average grain diameter are 20-100 μm.
According to the present invention, the carrier loaded magnesium component and/or titanium component can be by the way of dippings, by the load
In body the capillary pressure of the cellular structure of silica gel and rodlike mesopore molecular sieve make magnesium component presoma and/or titanium component presoma into
In the duct for entering the carrier, at the same the magnesium component presoma and/or titanium component presoma can also the carrier again surface
Absorption, until magnesium component presoma and/or titanium component presoma reach adsorption equilibrium on the surface of the carrier.At the dipping
Reason can be handled for co-impregnation, or step impregnation processing.In order to save preparation cost, simplify experimental technique, the leaching
Stain processing is preferably co-impregnation processing；It is further preferred that the condition of the co-impregnation processing includes: to contain the carrier
It is mixed in the mixed solution of magnesium component presoma and/or titanium component presoma, the temperature of the impregnation can be with
It is 25-100 DEG C, preferably 40-60 DEG C；The time of impregnation can be 0.5-1h, preferably 1-3h.
According to the present invention, the mixed solution containing magnesium component presoma and/or titanium component presoma can for containing
The organic solvent of magnesium salts and/or titanium salt, the organic solvent can be isopropanol and tetrahydrofuran, and tetrahydrofuran and isopropanol
Volume ratio can be 1:1-3, preferably 1:1-1.5.
According to the present invention, the process of the filtering may include: and after filtration, be washed repeatedly with isopropanol and tetrahydrofuran
(washing times can be 2-10) is washed, is then filtered.
According to the present invention, it is 60-180 DEG C that the condition of the drying, which may include: temperature, time 0.5-10h.
According to the present invention, the dosage of the carrier, magnesium component presoma and/or titanium component presoma can be according to expected
To the component of carrier selected, specifically, the dosage of the carrier, magnesium component presoma and/or titanium component presoma makes
In the polyolefin catalyst that must be prepared, on the basis of the total weight of the polyolefin catalyst, the content of the carrier is 90-99
The sum of content in terms of magnesium oxide and titanium elements oxide is 1-10 weight respectively for weight %, the magnesium component and titanium component
Measure %；Preferably, the dosage of the carrier, magnesium component presoma and/or titanium component presoma makes the catalyzed polyolefin of preparation
In agent, on the basis of the total weight of the polyolefin catalyst, the content of the carrier is 90.5-98.5 weight %, the magnesium
The sum of content in terms of magnesium oxide and titanium elements oxide is 1.5-9.5 weight % respectively for component and titanium component；It is more excellent
Selection of land, the dosage of the carrier, magnesium component presoma and/or titanium component presoma make in the polyolefin catalyst of preparation, with
On the basis of the total weight of the polyolefin catalyst, the content of the carrier is 91-96 weight %, the magnesium component and titanium component
The sum of content in terms of magnesium oxide and titanium elements oxide is 4-9 weight % respectively.
According to the present invention, the carrier forming method the following steps are included:
(1) in the presence of template, mixing that silicon source is mixed with sour agent, and obtained after being mixed
Object successively carries out crystallization, filtering and drying, obtains mesoporous material raw powder；
(2) mesoporous material raw powder is subjected to Template removal processing, obtains the rodlike mesopore molecular sieve；
(3) the rodlike mesopore molecular sieve is mixed with silica gel.
In the present invention, the type of the template is not particularly limited, as long as the stick in the carrier that can make
Shape mesopore molecular sieve has above-mentioned pore structure, it is preferable that the template can be poly- for triblock copolymer polyoxyethylene-
Oxypropylene-polyoxyethylene.Wherein, which can be commercially available (for example, can be purchased from Aldrich, trade name
For P123, molecular formula EO20PO70EO20), it can also be prepared by existing various methods.When the template is poly-
When ethylene oxide-polyoxypropylene polyoxyethylene, the molal quantity of the template is according to polyoxyethylene-poly-oxypropylene polyoxyethylene
Average molecular weight calculates to obtain.
In the present invention, the sour agent can be various acidic aqueous solutions commonly used in the art, for example, can be salt
At least one of acid, sulfuric acid, nitric acid and hydrobromic acid aqueous solution, preferably aqueous hydrochloric acid solution.
There is no particular limitation for the dosage of the acid agent, can change in a big way, it is preferable that the mixing connects
The pH value of touching is 1-6.
Under preferable case, in step (1), the condition being mixed includes: that temperature is 25-60 DEG C, when the time is
Between be 25min or more, pH 1-6.In order to be more advantageous to the uniform mixing between each substance, a kind of preferred implementation according to the present invention
Mode, described be mixed carry out under agitation.
In the present invention, the dosage of the template and the silicon source can change in a big way, such as the mould
The molar ratio of plate agent and the silicon source dosage can be 1:(10-90)；Preferably 1:(50-75).
In the present invention, the silicon source can be various silicon sources commonly used in the art, and the preferably described silicon source is positive silicon
At least one of acetoacetic ester, methyl orthosilicate, positive silicic acid propyl ester, sodium metasilicate and silica solution, more preferably ethyl orthosilicate.
Preferably, it is 50-120 DEG C that the condition of the crystallization, which includes: temperature, time 10-40h.According to a kind of preferred
Embodiment, the crystallization are implemented by hydrothermal crystallization method.
Preferably, the process of the washing may include: after filtration, to wash (washing times repeatedly with deionized water
Can be 2-10), then filtered.
Preferably, in step (2), the method for the removed template method is that alcohol washes method, the mistake of the Template removal processing
Journey includes: to wash the mesoporous material raw powder with alcohol, wash time 10-40h at 90-120 DEG C.
Preferably, in step (3), the mode that the rodlike mesopore molecular sieve is mixed with silica gel is mechanical blending.Using
The mode of mechanical blending can play good immixture and peptizaiton to the rodlike mesopore molecular sieve and silica gel, make institute
It states rodlike mesopore molecular sieve and silica gel to be mutually distributed in space occupied by other side, the initial distribution feelings for making the two be taken up space
Condition changes, and reduces the particle size of the two, and extreme case reaches the dispersion of molecular level.
In the present invention, to the type of the silica gel, there is no particular limitation, as long as the silica gel has the present invention aforementioned
Structural requirement described in first aspect, it is preferable that the silica gel is commercially available ES955 silica gel (GRACE company).
The present invention also provides the polyolefin catalysts prepared by the above method.
The present invention also provides a kind of methods of olefinic polymerization, which comprises under the polymerization conditions, is being catalyzed
In the presence of agent, make olefinic monomer carry out polymerization reaction, wherein the catalyst be polyolefin catalyst provided by the invention or by
The polyolefin catalyst of method preparation provided by the invention.
According to the present invention, there is no particular limitation for the reaction condition of the polymerization reaction, can be the alkene of this field routine
Polymerized hydrocarbon reaction condition, for example, the reaction can carry out in the presence of an inert gas, the condition of the polymerization reaction be can wrap
Include: temperature is 10-100 DEG C, time 0.5-5h, pressure 0.1-2MPa；Preferably, the condition of the polymerization reaction can wrap
Include: temperature is 20-95 DEG C, time 1-4h, pressure 0.5-1.5MPa；It is further preferred that temperature is 70-85 DEG C, the time
For 1-2h, pressure 1-1.5MPa.
Pressure of the present invention refers to gauge pressure.
In the present invention, the polymerization reaction can carry out in the presence of solvent, to used in the polymerization reaction
Solvent is not particularly limited, for example, can be hexane.
In a kind of specific embodiment, the supported polyolefin catalyst can be catalyzed for support type polyethylene
Agent, the polymerization reaction be ethylene polymerization, the method for the vinyl polymerization include: under conditions of ethylene polymerization,
In the presence of catalyst and auxiliary agent, ethylene is made to carry out polymerization reaction；Preferably, the auxiliary agent is alkyl aluminum compound.
In the present invention, the structure of the alkyl aluminum compound is shown in formula I:
AlRnX5 (3-n)Formulas I
In Formulas I, R can be respectively C1-C5Alkyl；X5One of halogen group, preferably-C can be respectivelyl；n
It is 0,1,2 or 3.
Preferably, the C1-C5Alkyl can be methyl, ethyl, n-propyl, isopropyl, normal-butyl, sec-butyl, isobutyl
One of base, tert-butyl, n-pentyl, isopentyl, tertiary pentyl and neopentyl are a variety of.
In the present invention, the specific example of the alkyl aluminum compound includes but is not limited to: trimethyl aluminium, dimethylammonium chloride
Aluminium, triethyl aluminum, diethyl aluminum chloride, tri-n-n-propyl aluminum, diη-propyl aluminium chloride, three n-butylaluminums, three sec-butyl aluminium, three uncles
Butyl aluminium, di-n-butyl aluminium chloride and diisobutyl aluminum chloride.Most preferably, the alkyl aluminum compound is triethyl aluminum.
In the present invention, the dosage of the alkyl aluminum compound may be the selection of this field routine, generally, described
The mass ratio of alkyl aluminum compound and the catalyst amount can be 1:0.1-10；Under preferable case, the alkyl aluminum chemical combination
The mass ratio of object and the catalyst amount is 1:0.2-8；More preferably 1:0.4-4.
In the present invention, the method for the olefinic polymerization can also include, after polymerization reaction, to final reaction
Mixture carries out suction filtration separation, so that polyolefin particles powder be made.
The present invention also provides polyolefin prepared by the above method.
The present invention will be described in detail by way of examples below.
In following embodiment and comparative example, X-ray diffraction analysis is in the model for being purchased from Bruker AXS company, Germany
It is carried out on the X-ray diffractometer of D8Advance；Scanning of the scanning electron microscope analysis in the model XL-30 purchased from FEI Co., the U.S.
It is carried out on electron microscope；Pore structure parameter analysis is in the ASAP2020-M+C purchased from the production of U.S. Micromeritics company
It is carried out on type adsorption instrument, the specific surface area and pore volume of sample, which calculate, uses BET method；The particle diameter distribution of sample swashs in Malvern
It is carried out on light particle size analyzer；Rotary Evaporators are the production of IKA company, Germany, model RV10digital；Polyolefin catalyst it is each
Component load capacity is on the wavelength dispersion X-ray fluorescence spectrometer for being Axios-Advanced purchased from Dutch Panaco company model
Measurement；The analysis of reaction product ingredient carries out on the gas chromatograph purchased from agilent company model 7890A；
The heap density of polyolefine powder is measured using method as defined in GB/T 1636-2008.
The melt index of polyolefin is measured using method as defined in ASTM D1238-99.
Preparation example 1: preparation contains the composite material F1 of rodlike mesopore molecular sieve C1 and silica gel A
(1) 4g (0.0007mol) template P123 is added to hydrochloric acid (16.4mL) and water containing 37 weight %
In the solution of (128mL), it is completely dissolved in 40 DEG C of stirrings to P123；8.86g (0.042mol) ethyl orthosilicate is added again later
Enter into above-mentioned solution, is stirred at 40 DEG C for 24 hours, then obtained solution is transferred to the reaction kettle of polytetrafluoroethyllining lining
In, at 90 DEG C crystallization for 24 hours, be then filtered and and be washed with deionized 4 times, then filtered and dried, obtained
Mesoporous material raw powder；The mesoporous material raw powder is washed for 24 hours under reflux conditions with ethyl alcohol, removed template method obtains rodlike
Mesopore molecular sieve C1；
(2) at 25 DEG C, by the rodlike mesopore molecular sieve C1 of 20g and 10g ES955 silica gel A, (relevant parameter is referring to table 1, purchase
From Grace company, the U.S.) mechanical blending is carried out, obtain the composite material F1 as carrier.
With XRD, scanning electron microscope and ASAP2020-M+C type adsorption instrument respectively to rodlike mesopore molecular sieve C1 and silicon
Glue A is characterized；
Fig. 1 is bar-like the X-ray diffracting spectrum of mesopore molecular sieve C1, wherein and abscissa is 2 θ, and ordinate is intensity, from
It is apparent that rodlike mesopore molecular sieve C1 diffraction maximum occurs in small angular region in XRD spectra, illustrate described rodlike mesoporous point
Son sieve C1 has the hexagonal hole road structure of sequential 2 D specific to mesoporous material SBA-15；
Fig. 2 is bar-like the microscopic appearance figure (SEM scanning electron microscope (SEM) photograph) of mesopore molecular sieve C1, as seen from the figure, rodlike Jie
The microstructure of porous molecular sieve C1 is consistent with result reported in the literature；
Fig. 3 is the microscopic appearance figure (SEM scanning electron microscope (SEM) photograph) of ES955 silica gel A, and as seen from the figure, the average grain diameter of sample is
Micron order；
Fig. 4 is the pore size distribution curve figure of composite material F1, and abscissa is aperture (unit nm), and ordinate is pore volume
Although (unit mL/g), as seen from the figure, the pore-size distribution of the composite material F1 have splitting, but be still Unimodal Distribution, and
The unimodal corresponding most probable pore size is 3-7nm；
The pore structure parameter of rodlike mesopore molecular sieve C1 and ES955 silica gel A are as shown in table 1.
Preparation example 2: preparation contains the composite material F2 of rodlike mesopore molecular sieve C2 and ES955 silica gel B
(1) 4g (0.0007mol) template P123 is added to hydrochloric acid (16.4mL) and water containing 37 weight %
In the solution of (128mL), it is completely dissolved in 40 DEG C of stirrings to P123；10.9g (0.0525mol) ethyl orthosilicate is added again later
Enter into above-mentioned solution, is stirred at 40 DEG C for 24 hours, then obtained solution is transferred to the reaction kettle of polytetrafluoroethyllining lining
In, the crystallization 20h at 100 DEG C, be then filtered and and be washed with deionized 4 times, then filtered and dried, obtained
Mesoporous material raw powder；The mesoporous material raw powder is washed for 24 hours under reflux conditions with ethyl alcohol, removed template method obtains rodlike
Mesopore molecular sieve C2；
(2) at 25 DEG C, by the rodlike mesopore molecular sieve C2 of 30g and 10g ES955 silica gel B, (relevant parameter is referring to table 1, purchase
From Grace company, the U.S.) mechanical blending is carried out, obtain the composite material F2 as carrier.
The XRD structure chart of rodlike mesopore molecular sieve C2, SEM microscopic appearance figure respectively with rodlike mesopore molecular sieve C1 phase
Seemingly, the SEM microscopic appearance figure of ES955 silica gel B is similar to ES955 silica gel A.
The pore structure parameter of rodlike mesopore molecular sieve C2 and ES955 silica gel B are as shown in table 1.
Table 1
| Sample | Specific surface area (m2/g) | Pore volume (ml/g) | Average pore size*(nm) | Partial size (μm) |
| C1 | 646 | 1 | 6.2 | - |
| C2 | 675 | 1.4 | 6.5 | - |
| ES955 silica gel A | 250 | 1.5 | 15 | 20-50 |
| ES955 silica gel B | 230 | 1.5 | 16 | 30-55 |
Preparation example 3: preparation contains the composite material F3 of rodlike mesopore molecular sieve C1 and ES955 silica gel B
Firstly, preparing rodlike mesopore molecular sieve C1 using method identical with preparation example 1.
Then at 25 DEG C, the rodlike mesopore molecular sieve C1 of 20g and 10g ES955 silica gel B is subjected to mechanical blending, is made
For the composite material F3 of carrier.
Preparation example 4: preparation contains the composite material F4 of rodlike mesopore molecular sieve C2 and ES955 silica gel A
Firstly, preparing rodlike mesopore molecular sieve C2 using method identical with preparation example 2.
Then at 25 DEG C, the rodlike mesopore molecular sieve C2 of 20g and 10g ES955 silica gel A is subjected to mechanical blending, is made
For the composite material F4 of carrier.
Preparation example 5: preparation contains the composite material F5 of rodlike mesopore molecular sieve C1 and ES955 silica gel A
Firstly, preparing rodlike mesopore molecular sieve C1 using method identical with preparation example 1.
Then at 25 DEG C, the rodlike mesopore molecular sieve C1 of 12g and 10g ES955 silica gel A is subjected to mechanical blending, is made
For the composite material F5 of carrier.
Preparation example 6: preparation contains the composite material F6 of rodlike mesopore molecular sieve C2 and ES955 silica gel B
Firstly, preparing rodlike mesopore molecular sieve C2 using method identical with preparation example 2.
Then at 25 DEG C, the rodlike mesopore molecular sieve C1 of 80g and 10g ES955 silica gel B is subjected to mechanical blending, is made
For the composite material F6 of carrier.
Embodiment 1-6: polyolefin catalyst Cat-1~Cat-6 is prepared
0.1g magnesium chloride and 0.1g titanium tetrachloride are dissolved in (four in the tetrahydrofuran of 10mL and the double solvents of isopropanol
The volume ratio of hydrogen furans and isopropanol is 1:1.2), form the mixed solution containing magnesium component presoma and titanium component presoma.
1g composite material F1~F6 is added to the mixed solution containing magnesium component presoma and titanium component presoma respectively at 45 DEG C
Middle dipping 1h, is then filtered, and carries out washing 4 times with n-hexane, in 75 DEG C of dryings, and is ground, is respectively obtained in table 2
Polyolefin catalyst, name are respectively Cat-1~Cat-6.
Embodiment 7
Polyolefin catalyst is prepared in the way of embodiment 1, only contains magnesium group the difference is that being formed in dipping process
Divide the mixed solution of presoma that 0.2g magnesium chloride is specifically dissolved in the tetrahydrofuran of 10mL and the double solvents of isopropanol
In (volume ratio of tetrahydrofuran and isopropanol be 1:1.2), form the mixed solution only containing magnesium component presoma.At 45 DEG C
1g composite material F1 is added in the mixed solution containing magnesium component presoma and titanium component presoma respectively and impregnates 1h, then
Filtering, and washing 4 times is carried out with n-hexane, it in 75 DEG C of dryings, and is ground, obtains the polyolefin catalyst Cat- in table 2
7。
Embodiment 8
Polyolefin catalyst is prepared in the way of embodiment 1, only contains titanium group the difference is that being formed in dipping process
The mixed solution of point presoma, specifically, by 0.2g titanium tetrachloride be dissolved in 10mL tetrahydrofuran and isopropanol it is compound molten
In agent (volume ratio of tetrahydrofuran and isopropanol is 1:1.2), the mixed solution only containing titanium component presoma is formed.At 45 DEG C
Lower 1g composite material F1 is added in the mixed solution containing magnesium component presoma and titanium component presoma respectively impregnates 1h, so
After filter, and with n-hexane carry out washing 4 times, in 75 DEG C of dryings, and ground, obtain the polyolefin catalyst in table 2
Cat-8。
Comparative example 1-4: polyolefin catalyst Cat-D-1~Cat-D-4 is prepared
Polyolefin catalyst is prepared by way of example, the difference is that respectively using only the rodlike of identical weight
As carrier, the polyolefin respectively obtained in table 2 is urged by molecular sieve C1, rodlike molecule sieve C2, ES955 silica gel A and ES955 silica gel B
Agent, name are respectively Cat-D-1~Cat-D-4.
Test case: ethylene polymerization is carried out
It in the stainless steel polymerization autoclave of 2L, is respectively replaced three times with nitrogen and ethylene, 200mL hexane is then added, it will
Kettle temperature rises to 80 DEG C, adds 800mL hexane, and with the addition of hexane, the concentration that 2mL is added is the triethyl aluminum of 1mol/L
(TEA) hexane solution is subsequently added into the catalyst of 0.5g, is passed through ethylene gas, and pressure is risen to 1MPa and is maintained 1MPa,
Separation is filtered after reacting 1 hour at 70 DEG C, obtains polyethylene particle powder.The heap density (BD) of gained polyethylene particle powder,
Melt index MI2.16And the efficiency of catalyst is listed in Table 2 below.
Table 2
It can be seen that by the result of table 2 and silica gel and rodlike Jie contained as carrier using the method for the present invention preparation
The catalyst that the composite material cooperation magnesium component and/or titanium component of porous molecular sieve are formed is when being used for olefin polymerization, polyene
Hydrocarbon catalyst catalytic efficiency with higher, and heap density and the lower polyolefin products of melt index can be obtained, specifically
Ground, when the carrier and loaded catalyst prepared using method of the invention is used for ethylene polymerization, catalytic efficiency is reachable
3000g PE/gcat h, the heap density of the polyethylene product of preparation is up to 0.4g/mL hereinafter, melt index is 0.8g/10min
Below.And it is lower not adopt the catalyst efficiency being obtained by the present invention, and when being used for catalyzed ethylene polymerization, obtains
The bulk density of the polyethylene product arrived is higher, and mobility is poor.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In skill of the invention
In art conception range, can with various simple variants of the technical solution of the present invention are made, including each technical characteristic with it is any its
Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, is belonged to
Protection scope of the present invention.
Claims (10)
1. a kind of polyolefin catalyst, which is characterized in that contain carrier in the polyolefin catalyst and be supported on the carrier
On magnesium component and/or titanium component, the carrier be the composite material containing silica gel and rodlike mesopore molecular sieve, rodlike Jie
Porous molecular sieve has two-dimentional hexagonal hole road distributed architecture, and the pore volume of the rodlike mesopore molecular sieve is 0.8-1.2mL/g, compares table
Area is 600-700m2/ g, average pore size 5-10nm；The specific surface area of the silica gel is 200-300m2/ g, pore volume 1-
2mL/g, average pore size 10-30nm, average grain diameter are 20-100 μm.
2. polyolefin catalyst according to claim 1, wherein on the basis of the total weight of the polyolefin catalyst,
The content of the carrier is 90-99 weight %, and the magnesium component and titanium component are aoxidized respectively with magnesium oxide and titanium elements
The sum of content of object meter is 1-10 weight %；
Preferably, the pore volume of the rodlike mesopore molecular sieve is 0.9-1.1mL/g, specific surface area 630-680m2/ g, it is average
Aperture is 5-8nm；The specific surface area of the silica gel is 230-280m2/ g, pore volume 1.2-1.8mL/g, average pore size 12-
18nm, average grain diameter are 30-70 μm；
Preferably, the content weight ratio of the rodlike mesopore molecular sieve and the silica gel is (1.2-10): 1；
Preferably, the rodlike mesopore molecular sieve is SBA-15, and the silica gel is 955 silica gel.
3. a kind of method for preparing polyolefin catalyst of any of claims 1 or 2, which is characterized in that this method comprises: lazy
In the presence of property gas, carrier is carried out at dipping in the mixed solution containing magnesium component presoma and/or titanium component presoma
Reason, is then successively filtered and dries, wherein and the carrier is the composite material containing silica gel and rodlike mesopore molecular sieve,
The rodlike mesopore molecular sieve has two-dimentional hexagonal hole road distributed architecture, and the pore volume of the rodlike mesopore molecular sieve is 0.8-
1.2mL/g, specific surface area 600-700m2/ g, average pore size 5-10nm；The specific surface area of the silica gel is 200-300m2/
G, pore volume 1-2mL/g, average pore size 10-30nm, average grain diameter are 20-100 μm.
4. according to the method in claim 3, wherein the dosage of the carrier, magnesium component presoma and/or titanium component presoma makes
In the polyolefin catalyst that must be prepared, on the basis of the total weight of the polyolefin catalyst, the content of the carrier is 90-99
The sum of content in terms of magnesium oxide and titanium elements oxide is 1-10 weight respectively for weight %, the magnesium component and titanium component
Measure %；
Preferably, the pore volume of the rodlike mesopore molecular sieve is 0.9-1.1mL/g, specific surface area 630-680m2/ g, it is average
Aperture is 5-8nm；The specific surface area of the silica gel is 230-280m2/ g, pore volume 1.2-1.8mL/g, average pore size 12-
18nm, average grain diameter are 30-70 μm；
Preferably, the content weight ratio of the rodlike mesopore molecular sieve and the silica gel is (1.2-10): 1；
Preferably, the rodlike mesopore molecular sieve is SBA-15, and the silica gel is 955 silica gel.
5. the method according to claim 3 or 4, wherein the forming method of the carrier the following steps are included:
(1) in the presence of template, mixture that silicon source is mixed with sour agent, and obtained after being mixed according to
Secondary progress crystallization, filtering and drying, obtain mesoporous material raw powder；
(2) mesoporous material raw powder is subjected to Template removal processing, obtains the rodlike mesopore molecular sieve；
(3) the rodlike mesopore molecular sieve is mixed with silica gel.
6. according to the method described in claim 5, wherein, in step (1), the condition being mixed includes: that temperature is
25-60 DEG C, the time is 25min or more, pH 1-6；
Preferably, the molar ratio of the template and the silicon source dosage is 1:(10-90)；
Preferably, it is 50-120 DEG C that the condition of the crystallization, which includes: temperature, time 10-40h；
Preferably, in step (2), the process of the Template removal processing includes: at 90-120 DEG C, by the mesoporous material
Original powder is washed with alcohol, wash time 10-40h；
Preferably, in step (3), the mode that the rodlike mesopore molecular sieve is mixed with silica gel is mechanical blending.
7. the polyolefin catalyst of the preparation of the method as described in claim 3-6.
8. a kind of method of olefinic polymerization, which comprises under the polymerization conditions, in the presence of a catalyst, make alkene
Monomer carries out polymerization reaction, which is characterized in that the catalyst is polyolefin described in any one of claim 1-2 and 7
Catalyst.
9. according to the method described in claim 8, wherein, the polymerization reaction carries out in the presence of an inert gas, the polymerization
The condition of reaction includes: that temperature is 10-100 DEG C, time 0.5-5h, pressure 0.1-2MPa.
10. the polyolefin that the method as described in claim 8 or 9 is prepared.
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