CN1640923A - In situ polymerization preparing method for carbon nano tube and polytene composite material - Google Patents
In situ polymerization preparing method for carbon nano tube and polytene composite material Download PDFInfo
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- CN1640923A CN1640923A CN 200410011336 CN200410011336A CN1640923A CN 1640923 A CN1640923 A CN 1640923A CN 200410011336 CN200410011336 CN 200410011336 CN 200410011336 A CN200410011336 A CN 200410011336A CN 1640923 A CN1640923 A CN 1640923A
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- carbon nanotube
- methylaluminoxane
- toluene
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Abstract
The present invention relates to the preparation process of one kind of composite carbon nanotube/polyethylene material. Single or multiple wall carbon nanotube is treated with oxidant to obtain functional carbon nanotube with hydroxyl, carbonyl and carboxyl groups on the surface; and further reacted with alkyl metallizing compound in inert atmosphere to connect metal organic matter component capable of catalyzing ethylene polymerization to obtain carbon nanotube supporting olefin polymerization catalyst. In the presence of alkyl metallizing compound as catalyst assistant, the prepared carbon nanotube supporting olefin polymerization catalyst catalyzes ethylene polymerization to obtain the composite carbon nanotube/polyethylene material. The composite material has two components homogeneously dispersed, electric and mechanical performance higher than other polyethylene material.
Description
Invention field
The invention belongs to the in-situ polymerization method for preparing of carbon nanotube and composite polyethylene material.Be specifically related to the preparation and the situ catalytic vinyl polymerization thereof of carbon nanotube loaded olefin polymerization catalysis, can obtain even carbon nanotube dispersive polyethylene based composition.
Background technology
The early 1990s in last century has been found carbon nanotube, and it has good optical, calorifics, electromagnetism and mechanical property.The polymer matrix composite of preparation carbon nanotube can make the material that obtains have the electricity and the mechanical property of improvement.The key that makes mixture have superperformance is to make carbon nanotube homodisperse in polymeric matrix.Chinese patent 02113457.X discloses a kind of preparation method of polymer-base carbon nanotube matrix material, by ultrasonic wave carbon nanotube is disperseed in the monomer of liquid phase, then this monomer of catalyzed polymerization and obtain the polymer-base carbon nanotube matrix material.This method only is applicable to and is the monomer of liquid under the normal temperature and pressure, is not suitable under the normal pressure to prepare polyethylene based composition for the vinyl monomer of gas; On the other hand, this method also is difficult to prevent carbon nanotube reassembling in polymerization process.For preparation carbon nanotube and poly mixture, the method that the Karen Lozano of U.S. The University of Texas-Pan American describes in the Carbon magazine was rolled up 2329 pages paper in 2004 the 42nd is to make polyethylene and carbon fiber or carbon nanotube two component melts attitude blend and obtain mixture.Owing to reasons such as the characteristic of the easy self aggregation of carbon nanotube itself and entanglement and mixed with polymers system body viscosity are big, be difficult to obtain carbon nanotube with this method and disperse matrix material very uniformly.
Summary of the invention
The purpose of this invention is to provide a kind of carbon nanotube and poly matrix material;
Another object of the present invention provides the preparation method of a kind of carbon nanotube and poly matrix material.
The present invention uses the carrier of functionalized carbon nanotube as ethylene rolymerization catalyst, method by in-situ polymerization, thereby carbon nanotube is as dissemination in polyethylene matrix the uniform distribution of support of the catalyst by catalyzer in the polymerization, the matrix material that obtains having good electrical and mechanical property.
In order to prepare even carbon nanotube dispersive polyvinyl mixture, the present invention will at first provide a kind of preparation method of carbon nanotube loaded metallocene catalyst; Realize by carbon nanotube loaded metallocene catalyst catalyzed ethylene in-situ polymerization then.
Mixture provided by the invention is made up of carbon nanotube and polyethylene.Be applicable to that carbon nanotube of the present invention comprises single wall and multi-walled carbon nano-tubes.
Preparing carbon nanotube loaded metallocene catalyst was made of following several steps: 1) with carbon nanotube in volume ratio is 3: 1 nitric acid and sulfuric acid mixture liquid, temperature is 130 ℃ to be handled 2 hours, reaction back elimination acid solution is washed to neutrality, heating under vacuum is removed moisture; Through X-ray photoelectron spectroscopic analysis, the carbon nano tube surface hydroxyl, carbonyl and carboxyl mole total content are 1%～30%.2) carbon nanotube after the oxide treatment is added toluene and methylaluminoxane or modified methylaluminoxane in the reactor of dry-off moisture and air, the weight ratio of carbon nanotube and methylaluminoxane is 1: 1～1: 5, in temperature is 20 ℃～80 ℃ reactions 1～48 hour, reaction finishes back elimination solvent, is washed till no free methylaluminoxane in the washings with toluene.3) in the carbon nanotube after step 2 is handled, add toluene and dichlorodicyclopentadienyl titanium or dichloro dicyclopentadienyl zirconium, the weight ratio of carbon nanotube and titanium or zirconium compounds is 1: 0.05～1: 0.50, be 20 ℃～80 ℃ reactions 1～48 hour and be washed till no free titanium or zirconium compounds in the filtrate in temperature with toluene, the elimination solvent obtains carried catalyst; Measure through plasma emission spectrum, the weight ratio of carbon nanotube and titanium or zirconium is 1: 0.001～1: 0.05 in the product that obtains.
The situ catalytic vinyl polymerization carries out in the anhydrous and oxygen-free polymerization reactor, adds earlier through removing the toluene of water treatment, feeds ethylene gas, adds methylaluminoxane or modified methylaluminoxane, adds the present invention at last and prepares carbon nanotube loaded catalyzer; The mol ratio of zirconium or titanium is 500～2500 in methylaluminoxane and the catalyzer, and 30 ℃～80 ℃ reactions of temperature 0.2～10 hour, the reaction back added hydrochloride ethanol liquid, obtains carbon nanotube and polyethylene composite after the filtration.
The carbon nanotube loaded metallocene catalysts method that the present invention relates to is simple, directly obtains the finely dispersed polyvinyl mixture of carbon nanotube with this catalyzer by catalyzed ethylene polymerization.
Embodiment 1
1) carbon nanotube is functionalized
Adding 0.5 gram pipe range in 200 milliliters of reaction flasks of condensation and whipping appts are housed is 500 nanometers, the multi-walled carbon nano-tubes of caliber 20 nanometers, add 50 ml volumes then than the sulfuric acid and the nitric acid mixed solution that are 3 to 1, in 130 ℃ of reactions 2 hours, the elimination acid solution, with the carbon nanotube of deionized water wash remainder to the pH value of washings is 6, and sample obtained functionalized carbon nanotubes in 24 hours 80 ℃ of vacuum-dryings; Reaction yield is 60%; On infrared absorption spectra, can see hydroxyl, the charateristic avsorption band of carbonyl and carboxyl, measuring the mole total amount of three kinds of groups on carbon nanotube by the x-ray photoelectron power spectrum is 30%.
2) methylaluminoxane and functionalized carbon nanotubes reaction
To be furnished with the reactor of stirring and filtration unit handles through the deoxygenation that dewaters, add the functionalized carbon nanotubes that 0.3 gram step 1) obtains with the saturated back of rare gas element, add 20 milliliters of dehydrated toluenes, add the methylaluminoxane toluene solution of 25 milliliters of 1 mole of every liter of concentration, carbon nanotube counts 1 to 5 with methylaluminoxane with weight ratio; In 20 ℃ of reactions 48 hours, the elimination solvent was used toluene wash three times, obtains the carbon nanotube that methylaluminoxane is handled.
3) preparation of carbon nanotube loaded dichloro dicyclopentadienyl Zr catalyst
Will through the carbon nanotube that methylaluminoxane is handled will be furnished with stir and the reactor of strainer in add 20 milliliters of toluene under the rare gas element, add 0.15 then and restrain dichloro dicyclopentadienyl zirconium, carbon nanotube counts 1 to 0.5 with zirconium compounds with weight ratio; In 20 ℃ of reactions 48 hours, the elimination solvent toluene was used toluene wash three times, filters dried solvent, and vacuum-drying obtains black solid and is carbon nanotube loaded dichloro dicyclopentadienyl Zr catalyst; Measured by plasma emission spectrum, zirconium content is 50 milligrams of every gram carried catalysts of zirconium in the product that obtains
4) carbon nanotube loaded dichloro dicyclopentadienyl Zr catalyst catalyzed ethylene polymerization
In the polymerization bottle of being furnished with stirring of the deoxygenation that dewaters, add 100 milliliters of toluene successively, 5.5 the methylaluminoxane of 1 mole of every liter of concentration of milliliter, the carbon nanotube loaded catalyzer of 0.1 gram step 3) synthetic, the ratio of methylaluminoxane and zirconium is 100 with molar ratio computing in the reaction system; 30 ℃ feed ethylene gas down, react stopped reaction after 10 hours, product are poured into be settled out in the Muriatic ethanol, obtain the canescence product.Filter, vacuum-drying obtains 2.0 gram carbon nanotube and poly mixtures; The content of carbon nanotube in mixture is 5.0% by weight.
Embodiment 2
1) modified methylaluminoxane and functionalized Single Walled Carbon Nanotube reaction
With embodiment 1 step 1) same procedure be 200 microns with pipe range, the Single Walled Carbon Nanotube of caliber 2 nanometers is functionalized, measuring the mole total amount of three kinds of groups on carbon nanotube by the x-ray photoelectron power spectrum is 2%.
Will with embodiment 1 step 2) identical reactor handles through the deoxygenation that dewaters, add the functionalized Single Walled Carbon Nanotube of 0.3 gram with the saturated back of rare gas element, add 20 milliliters of dehydrated toluenes, add the modified methylaluminoxane toluene solution of 5 milliliters of 1 mole of every liter of concentration, carbon nanotube is 1 to 1 with the weight ratio of modified methylaluminoxane; Elimination solvent after reacting 1 hour under 80 ℃ is used toluene wash three times, obtains the Single Walled Carbon Nanotube that modified methylaluminoxane is handled.
2) carbon nanotube loaded dichlorodicyclopentadienyl titanium Preparation of Catalyst
Will through the Single Walled Carbon Nanotube that modified methylaluminoxane is handled will be furnished with stir and the reactor of strainer in add 20 milliliters of toluene under the rare gas element, add 0.003 then and restrain cyclopentadienyl titanium dichloride, carbon nanotube is 1 to 0.01 with the weight ratio of cyclopentadienyl titanium dichloride; In 80 ℃ of reactions 1 hour, the elimination solvent toluene was used toluene wash three times, the elimination solvent, and vacuum-drying obtains black solid and is carbon nanotube loaded dichlorodicyclopentadienyl titanium catalyzer; Measured by plasma emission spectrum, titanium content is 1 milligram of every gram carried catalyst of titanium in the product that obtains.
3) carbon nanotube loaded dichlorodicyclopentadienyl titanium catalyst vinyl polymerization
In the autoclave pressure of being furnished with stirring of the deoxygenation that dewaters, the modified methylaluminoxane that adds 0.5 milliliter of 1 mole of every liter of concentration, 0.01 gram step 2) the carbon nanotube loaded catalyzer of synthetic, the ratio of modified methylaluminoxane and titanium is 2500 with molar ratio computing in the reaction system; 80 ℃ feed ethylene gas down, react stopped reaction after 0.2 hour, product are poured into be settled out in the Muriatic ethanol, obtain the canescence product.Filter, vacuum-drying obtains 10.5 gram carbon nanotube and poly mixtures; The content of carbon nanotube in mixture is 1.0% by weight.
Embodiment 3
1) carbon nanotube loaded dichloro dicyclopentadienyl Zr catalyst preparation
With embodiment 1 step 1) same procedure be 500 microns with pipe range, the multi-walled carbon nano-tubes oxide treatment of caliber 300 nanometers, measuring the mole total amount of three kinds of groups on carbon nanotube by the x-ray photoelectron power spectrum is 5%.
With embodiment 1 step 2) identical method adds functionalized carbon nanotubes the toluene solution of methylaluminoxane of 1 mole of every liter of concentration of 10 milliliters, and carbon nanotube is 1 to 2 with the weight ratio of methylaluminoxane; In 50 ℃ of reactions 12 hours, obtain the carbon nanotube that methylaluminoxane is handled.
Will through the carbon nanotube that methylaluminoxane is handled will be furnished with stir and the reactor of strainer in 20 milliliters of toluene of adding under the rare gas element, add 0.05 gram dichloro dicyclopentadienyl zirconium then, carbon nanotube is 1 to 0.1 with the weight ratio of bis cyclopentadienyl zirconium dichloride, in 50 ℃ of reactions 24 hours, the elimination solvent toluene, with toluene wash three times, filter dried solvent, vacuum-drying obtains black solid and is carbon nanotube loaded dichloro dicyclopentadienyl Zr catalyst; Measured by plasma emission spectrum, zirconium content is 20 milligrams of every gram carried catalysts of zirconium in the product that obtains
2) carbon nanotube loaded bis cyclopentadienyl zirconium dichloride catalyst vinyl polymerization
In the reactor of being furnished with stirring of the deoxygenation that dewaters, add toluene successively, 11 milliliters 1 mole every liter methylaluminoxane, the carbon nanotube loaded catalyzer of 0.01 gram step 1) synthetic, methylaluminoxane and titanium metal are 1000 with molar ratio computing; 60 ℃ feed ethylene gas down, react stopped reaction after 2 hours, product are poured into be settled out in the Muriatic ethanol, obtain the canescence product.Filter, vacuum-drying obtains 21 gram carbon nanotube and poly mixtures; The content of carbon nanotube in mixture is 0.05% by weight.
Behind 180 ℃ of fusion compressing tablets of the composite sample that obtains, it is disconnected in liquid nitrogen sample to be quenched, and uses the sem observation fracture morphology, can see that even carbon nanotube is dispersed in the polyethylene matrix; The data of the electronic tensile machine test of dumbbell shaped mixture batten are: tensile strength 28MPa, elongation at break 1200%.
Claims (3)
1. carbon nanotube and composite polyethylene material are made up of carbon nanotube and polyethylene two portions, and wherein the content of carbon nanotube is 0.05% to 5% by weight.
2. as claims 1 described carbon nanotube and composite polyethylene material, it is characterized in that described carbon nanotube is single wall or many walls nanotube, pipe range 500 nanometers～500 microns, caliber 2 nanometers～300 nanometers.
3. method for preparing described carbon nanotube of claim 1 and composite polyethylene material, at first carry out the preparation of carbon nanotube loaded metallocene catalyst, constitute by following several steps: 1) with carbon nanotube in volume ratio is 3: 1 nitric acid and sulfuric acid mixture liquid, temperature is 130 ℃ and handled 2 hours, reaction back elimination acid solution, be washed to neutrality, heating under vacuum is removed moisture; The carbon nano tube surface hydroxyl, carbonyl and carboxyl mole total content are 1%～30%; 2) carbon nanotube after the oxide treatment is added toluene and methylaluminoxane or modified methylaluminoxane in the reactor of dry-off moisture and air, the weight ratio of carbon nanotube and methylaluminoxane is 1: 1～1: 5, in temperature is 20 ℃～80 ℃ reactions 1～48 hour, reaction finishes back elimination solvent, is washed till no free methylaluminoxane in the washings with toluene; 3) in the carbon nanotube after step 2 is handled, add toluene and dichlorodicyclopentadienyl titanium or dichloro dicyclopentadienyl zirconium, the weight ratio of carbon nanotube and titanium or zirconium compounds is 1: 0.05～1: 0.50, be 20 ℃～80 ℃ reactions 1～48 hour and be washed till no free titanium or zirconium compounds in the filtrate in temperature with toluene, the elimination solvent obtains carried catalyst; Measure through plasma emission spectrum, the weight ratio of carbon nanotube and titanium or zirconium is 1: 0.001～1: 0.05 in the product that obtains;
The situ catalytic vinyl polymerization carries out in the anhydrous and oxygen-free polymerization reactor, adds earlier through removing the toluene of water treatment, feeds ethylene gas, adds methylaluminoxane or modified methylaluminoxane, adds carbon nanotube loaded catalyzer at last; The mol ratio of zirconium or titanium is 500～2500 in methylaluminoxane and the catalyzer, and 30 ℃～80 ℃ reactions of temperature 0.2～10 hour, the reaction back added hydrochloride ethanol liquid, obtains carbon nanotube and composite polyethylene material after the filtration.
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