CN103073941A - Vanadium dioxide powder slurry and preparation method thereof - Google Patents
Vanadium dioxide powder slurry and preparation method thereof Download PDFInfo
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- CN103073941A CN103073941A CN2012100179173A CN201210017917A CN103073941A CN 103073941 A CN103073941 A CN 103073941A CN 2012100179173 A CN2012100179173 A CN 2012100179173A CN 201210017917 A CN201210017917 A CN 201210017917A CN 103073941 A CN103073941 A CN 103073941A
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- C01G31/02—Oxides
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Abstract
The invention relates to vanadium dioxide powder slurry and a preparation method thereof. The invention relates to vanadium dioxide powder slurry comprising vanadium dioxide composite powder. The vanadium dioxide composite powder comprises vanadium dioxide nano-powder with a chemical composition of V1-xMxO2, and organic modification long-chain molecules are grafted on the surface of the vanadium dioxide nano-powder. M is a doping element, and x is no smaller than 0 and no greater than 0.5. According to the invention, the surface of the vanadium dioxide nano-powder is subjected to organic modification, such that chemical stability and dispersibility of the vanadium dioxide powder and the slurry thereof are greatly improved.
Description
Technical field
The present invention relates to a kind of hypovanadic oxide powder slurry and preparation method thereof, be mainly used in the preparation intelligent energy-saving coating, also can be used for the heat insulation occasions such as glass and exterior wall.
Background technology
The building energy consumption of China has accounted for 27.8% of social total energy consumption, and wherein the energy consumption of heating and air-conditioning accounts for 55% of building total energy consumption.In modern building, it is increasing that glass accounts for the area ratio of exterior wall, and the heat of being undertaken by glass port according to measuring and calculating is delivered in winter and summer and accounts for respectively 48% and 71%.If adopt air-conditioning to regulate room temp, refrigeration temperature improves 2 ℃, and cooling load reduces approximately 20%; Heat temperature and turn down 2 ℃, heating load and reducing approximately 30%, by sticking thermal isolation film or the coating heat insulating coat can significantly reduce energy consumption on glass.
Present thermal isolation film or coating on the market is main still to intercept infrared property as main, can not change by response environment, they only have the function of reflects infrared light, and at low temperatures through ultrared effect, can not play the effect of intelligent surge chamber internal-external temperature difference, the needs searching is a kind of can intelligence regulate the material of solar heat, thereby realizes effect cool in summer and warm in winter.
The vanadium dioxide material has the first-order phase transition characteristic, but the induced environment temperature variation, and this variation of intelligent response realizes that the band selective to sunlight sees through or covers.Usually when envrionment temperature was lower than transformation temperature, the film or the coating that contain vanadium dioxide almost were fully penetrating to the visible light in the sunlight and mid-infrared light; When temperature surpassed the semi-conductor of vanadium dioxide-metal phase change temperature, vanadium dioxide underwent phase transition and is converted into the R phase, and this moment, material can to the blocking of mid-infrared light selectivity, reach the purpose of transparent (visible light sees through) thermal resistance.Semi-conductor-the metal phase change of vanadium dioxide is thermoinducible reversible change, and its temperature switch effect can be used to the ultrared break-make of centering and carries out intelligent control.Utilize vanadium dioxide low under the infrared light district high temperature see through and low temperature under high transmission, can prepare the Energy Saving Windows port system of complete intelligence.
Optical computing shows (S.-Y.Li, a_G.A.Niklasson, and C.G.Granqvist Nanothermochromics:Calculations for VO
2Nanoparticles in dielectric hosts show much improved luminous transmittance and solar energy transmittance modulation, JOURNAL OF APPLIED PHYSICS 108,0635252010) if vanadium dioxide nano powder can be scattered in other matrix, such as transparent polymer, can be on the basis that keeps vanadium dioxide optics performance of control, improve visible light transmissivity to realistic scale, can carry out reducing energy consumption to the outside surface of the transportation means such as in commission glass, metope and car and boat.By the vanadium dioxide material being accomplished nano-scale and can being prepared a kind of intelligent temperature control coating with organically-modified Material cladding, but because the nanoparticle specific surface area is little and surface free energy is high, be easy between the particle reunite, this specific character has determined direct the vanadium dioxide nano particle to be joined in the coating, be difficult to the performance of real performance nano material, and easily reunite, affect optical property and the outward appearance of coating, thereby limited the application of material on adhering film to glass and transparent glass.As having mentioned a kind of vanadium dioxide intelligent temperature control coating in the Chinese patent application numbers 200410051965, but its vanadium dioxide particle of mentioning belongs to unmodified vanadium dioxide particle, do not relate to the pre-treatment of particle, particularly the vanadium dioxide particle mentioned of the present invention carries out front dispersion treatment, and particularly organically-modified processing is for the raising of its dispersing property and chemical stability performance.
Chinese patent application number: 200610117027.4 mention a kind of preparation method of hypovanadic oxide suspensoid, the dispersion treatment that wherein relates to hypovanadic oxide powder, but what it adopted is inorganic modified method, prepare the vanadium dioxide composite particles from organically-modified scheme that the present invention takes the different of essence are arranged, and adopt acidity or alkaline condition in the invention, can destroy the structure of vanadium dioxide.
Chinese patent application number: mentioned the surface treatment of light modulation paint particles in 200980123044.0 thermo-color microparticals and dispersion liquid thereof and manufacture method and light modulation coating, light modulation film, the light modulation printing ink, but it does not propose concrete method of modifying, and this invention processing is that titanium dioxide has the different of essence with the related vanadium dioxide composite granule of vanadium dioxide composite particles and this patent summary of the invention.
Summary of the invention
Use hypovanadic oxide powder and hypovanadic oxide powder and the compound preparation film of other materials, method is simple, is convenient to large-scale operation, not only can be used for the energy-saving transformation of original glass port, and can be coated on the different substrates, enlarges the applicability of vanadium dioxide.But hypovanadic oxide powder is prepared into the vanadium dioxide slurries, when forming film and coating, requires hypovanadic oxide powder to have excellent dispersing property and chemical stability.
At this, the invention provides a kind of vanadium dioxide composite granule, comprise that chemical constitution is V
1-xM
xO
2Vanadium dioxide nano powder, the vanadium dioxide nano powder surface is connected to machine modification long chain molecule, wherein M is doped element, 0≤x≤0.5.
Vanadium dioxide composite granule of the present invention, organically-modified to the surface process of vanadium dioxide and Dope nano-power thereof.It is different from the hypovanadic oxide powder of general unmodified or inorganic parcel and modification, and the mode by organic modifiers makes the vanadium dioxide surface connect organically-modified long chain molecule, thereby greatly improves chemical stability and the dispersiveness of hypovanadic oxide powder.Use vanadium dioxide composite granule stability provided by the invention and good dispersity, can prolonged preservation use, can be used as intelligent heat insulation powder and be applied to prepare intelligent energy-saving coating or coating, also can be used for the heat insulation occasions such as glass and exterior wall.It is different from general lagging material, and it can significantly intercept infrared light when transformation temperature is above, can highly see through and be lower than the transformation temperature infrared rays, and this variation is reversible, can realize that the intelligence of solar heat is regulated.
Preferably, in the vanadium dioxide composite granule of the present invention, the content of organically-modified long chain molecule is 0.1～50%.More preferably, organically-modified long chain molecule content is 1～10%.Organically-modified long chain molecule content is too small, then can't realize the abundant parcel of powder surface; Organically-modified long chain molecule content is excessive, can cause mutually tangling between the organic molecule, affects on the contrary dispersion effect.
Preferably, organically-modified long chain molecule chain length is at 0.1nm～100nm.
The present invention relates to the organic surface modifying of vanadium dioxide nano particle, can effectively improve the dispersiveness of vanadium dioxide and Dope nano-power thereof and the chemical stability of powder.
Organically-modified long chain molecule is for comprising the functionalized organic long-chains such as chain alkyl, polyacrylic acid group, polyvinyl alcohol group, epoxide group, chain alkyl amine groups, halogenation chain alkyl, carboxylated chain alkyl.
Vanadium dioxide composite granule of the present invention, by the grafting of organically-modified properties-correcting agent on the hypovanadic oxide powder surface, be wrapped in the hypovanadic oxide powder surface, thereby can change the surface property of vanadium dioxide, difference according to selected group, can increase the dispersing property of vanadium dioxide composite particles in different solvents, expand the purposes of vanadium dioxide particle in intelligent temperature control coating or coating.
Preferably, the vanadium dioxide nano powder in the vanadium dioxide composite granule of the present invention is Rutile Type, and phase transition temperature is adjustable at-20～70 ℃.The shared ratio of rutile phase hypovanadic oxide can be up to 80%, even can reach 100%.This vanadium dioxide nano powder has the first-order phase transition characteristic, but the induced environment temperature variation, and this variation of intelligent response realizes that the band selective to sunlight sees through or covers.Usually when envrionment temperature was lower than transformation temperature, the film or the coating that contain vanadium dioxide almost were fully penetrating to the visible light in the sunlight and mid-infrared light; When temperature surpassed the semi-conductor of vanadium dioxide-metal phase change temperature, vanadium dioxide underwent phase transition and is converted into the R phase, and this moment, material can to the blocking of mid-infrared light selectivity, reach the purpose of transparent (visible light sees through) thermal resistance.Semi-conductor-the metal phase change of vanadium dioxide is thermoinducible reversible change, and its temperature switch effect can be used to the ultrared break-make of centering and carries out intelligent control.
The doped element M of regulation can be or arbitrary combination in the elements such as near 21～30 transition element the vanadium in the periodic table of elements, tin and near element thereof and tungsten, molybdenum, ruthenium, niobium in the present invention.Wherein, near 21～30 transition element in the periodic table of elements vanadium comprise scandium, titanium, chromium, manganese, iron, cobalt, nickel, copper and zinc, and described tin and near element thereof comprise indium, antimony, tin, gallium, germanium, lead and bismuth.Preferred doped element is tungsten, molybdenum, bismuth, tin, iron, zinc and titanium.
Adopt above-mentioned doped element, can controlled doping hypovanadic oxide powder size and pattern, used doped element equally also can be regulated and control the phase transition temperature of vanadium dioxide.
In the present invention, doped vanadium dioxide powder is preferably particulate state, and the length-to-diameter ratio of particle is 1: 1～10: 1, is preferably 1: 1～5: 1, more preferably 1: 1～2: 1.Particle size is not more than 1um at least one dimension, preferably is not more than 100nm at least one dimension, more preferably all is not more than 100nm on three dimensions, most preferably all is not more than 70nm on three dimensions.Described particulate state can be such as subsphaeroidal, oval, snowflake shape, cube, sheet shape etc.
Hypovanadic oxide powder dispersed better with above-mentioned size and pattern.Dispersiveness through the composite granule after the modification also will be further enhanced.
The application also provides a kind of preparation method of vanadium dioxide composite granule, comprises that operation (1) is scattered in vanadium dioxide nano powder in the dispersion medium, gets mixture A; (2) in described mixture A, add dispersing auxiliary and the organic modifiers that is used to form hypovanadic oxide powder surface organic modification long chain molecule, be stirred to and fully mix to get mixture B; (3) mixture B drying is made organically-modified vanadium dioxide composite granule.
Hypovanadic oxide powder can be rutile phase hypovanadic oxide nanoparticle or doped rutile phase hypovanadic oxide nanoparticle.Can be the method preparation that provides according to publication 2010PA011267CN, also can be rutile phase hypovanadic oxide nanoparticle or the doped rutile phase hypovanadic oxide nanoparticle of other known method preparations.The powder granule gravel size decision is below 200nm.The pattern of powder can be particle, nanometer rod and flakes particle.If preparation doped rutile phase hypovanadic oxide nanoparticle, before doped element, can adopt alkaline reagents to process presoma (the tetravalent vanadium ion aqueous solution), can obtain the controlled hypovanadic oxide powder size of size and pattern (being not more than 1um at least one dimension) and pattern (particulate state, length-to-diameter ratio is not more than 10: 1), the hypovanadic oxide powder grain-size of preparation is little, uniform particle diameter, and stable crystal form, it is at water, good dispersity in the dispersion agent (for example polyvinylpyrrolidone), be easy to be coated on the matrixes such as glass, be suitable for preparing film and the coating of hypovanadic oxide powder.
The preparation method of vanadium dioxide composite granule provided by the invention, the dispersing auxiliary that adds in the operation (2) can be polyvinyl alcohol, one or more in polyvinylpyrrolidone, organic modified polyorganosiloxane dipropylene glycol monomethyl ether solution, organic silicon surfactant or fluorochemical surfactant or the dispersing auxiliary known altogether in the industry.
The organic modifiers that adds among the preparation method of vanadium dioxide composite granule provided by the invention, operation (2) can be the organic modifiers such as stearic acid, polyacrylic acid, silane coupling agent, aluminate coupling agent or titanate coupling agent.Be preferably the silane coupling agent of pbz polymer long-chain.
Mode by coupling agent can make the vanadium dioxide surface connect the organic long-chain molecule, thereby greatly improves chemical stability and the dispersiveness of hypovanadic oxide powder.
Used dispersion medium can be ethanol among the preparation method of vanadium dioxide composite granule provided by the invention, one or more in the inert solvents such as Virahol, chloroform, dimethyl formamide, dimethyl sulfoxide (DMSO) ethylene dichloride or acetone.
In inert media, carry out organically-modifiedly, can prevent the sex change of vanadium dioxide, improve the chemical stability of powder.
The preparation method of vanadium dioxide composite granule provided by the invention, preparation technology's innovation, by the organic surface modifying process of organic modifiers, can effectively improve dispersiveness and the chemical stability of vanadium dioxide (vanadium dioxide) and Dope nano-power thereof.
In addition, the present invention also provides a kind of hypovanadic oxide powder slurry that comprises vanadium dioxide composite granule of the present invention.
Wherein, hypovanadic oxide powder slurry provided by the invention can possess, (1) vanadium dioxide composite granule, and it comprises that chemical constitution is V
1-xM
xO
2Vanadium dioxide nano powder, and described powder surface is connected to machine modification long chain molecule, wherein M is doped element, 0≤x≤0.5; And (2) dispersion medium.
In the hypovanadic oxide powder slurry of the present invention, vanadium dioxide composite granule and dispersion medium weight ratio can be 1: 1～1: 1000.Preferably, the weight ratio of vanadium dioxide composite granule and dispersion medium is 1: 5～1: 500.It more preferably is 1: 10～1: 100.Vanadium dioxide composite granule by the present invention's preparation can effectively disperse in 0～50 % by weight scope.If from the application point of smart coat, the scope of 0.5～10 % by weight more preferably.Too high levels can affect the transmittance of coating, crosses the low intelligent effect of heat insulation that then is difficult to bring into play coating.
Can select in deionized water, ethanol, propyl alcohol, Virahol, ethyl acetate, toluene, the butanone one or more as the dispersion medium in the hypovanadic oxide powder slurry of the present invention again.
In addition, vanadium dioxide composite granule slurry of the present invention can also comprise dispersing auxiliary, this dispersing auxiliary can be to be selected from polyacrylate, polyacrylamide, polyphosphoric acid salt, polyvinyl alcohol, polyvinylpyrrolidone, modified poly ester, one or more in modified polyurethane and the modified acroleic acid dispersion agent.
In addition, the present invention also is provided for preparing the preparation method of hypovanadic oxide powder slurry of the present invention.
Among the preparation method of hypovanadic oxide powder slurry provided by the invention, can be first the vanadium dioxide composite granule be added and carry out pre-dispersedly in the dispersion medium, then add described dispersion agent, mix and make described hypovanadic oxide powder slurry.
Vanadium dioxide composite granule of the present invention and the hypovanadic oxide powder slurry that comprises this powder, can be applicable to prepare intelligent energy-saving coating or coating, the coating transparency of preparation is high, low, the ageing-resistant ability of mist degree is strong, be mainly used in film, the flexible materialss such as cloth also can be used for the heat insulation occasions such as glass and exterior wall.
Description of drawings
Fig. 1 is that the hypovanadic oxide powder surface is without the transmission electron microscope picture of organically-modified hypovanadic oxide powder;
Fig. 2 is that the hypovanadic oxide powder surface is through the transmission electron microscope picture of organically-modified vanadium dioxide composite granule.
Embodiment
Below, with reference to accompanying drawing, and further specify the present invention in conjunction with subordinate's embodiment.
The vanadium dioxide material has the first-order phase transition characteristic, but the induced environment temperature variation, and this variation of intelligent response realizes that the band selective to sunlight sees through or covers.Vanadium dioxide nano powder is scattered in other matrix, such as transparent polymer, can on the basis that keeps vanadium dioxide optics performance of control, improve visible light transmissivity to realistic scale, can carry out reducing energy consumption to the outside surface of the transportation means such as in commission glass, metope and car and boat.But because the nanoparticle specific surface area is little and surface free energy is high, be easy between the particle reunite, this specific character has determined direct the vanadium dioxide nano particle to be joined in the coating, be difficult to the performance of real performance nano material, and easily reunite, affect optical property and the outward appearance of coating, thereby limited the application of material on adhering film to glass and transparent glass.The present invention relates to the organic surface modifying process of vanadium dioxide nano particle, can effectively improve the dispersiveness of vanadium dioxide and Dope nano-power thereof and the chemical stability of powder.
Among the preparation method of vanadium dioxide composite granule of the present invention, comprise, vanadium dioxide nano powder is scattered in the dispersion medium, get the operation of mixture A; In described mixture A, add dispersing auxiliary and be used to form the organic modifiers of hypovanadic oxide powder surface organic modification long chain molecule, be stirred to and fully mix to get the operation of mixture B; Mixture B drying is made the operation of organically-modified vanadium dioxide composite granule.
The preparation method of above-mentioned vanadium dioxide composite granule, particularly, dispersion medium elder generation's high-speed stirring dispersing and mixing and the ultra-sonic dispersion that can be with weight percent content 1～50% hypovanadic oxide powder and 50～99% get mixture, in mixture, add again afterwards dispersing auxiliary and organic modifiers, 0～200 ℃ of lower stirring of constant temperature, disperse by modes such as ultrasonic, sand milling or ball millings, again centrifugation, vacuum-drying obtains organically-modified vanadium dioxide composite granule under the certain temperature.
Wherein, with in vanadium dioxide nano powder and the operation that dispersion medium mixes, the weight ratio of vanadium dioxide nano powder and dispersion medium can be 1: 1～1: 1000.Preferably, the weight ratio of vanadium dioxide nano powder and dispersion medium is 1: 5～1: 100.When weight ratio was too small, then hypovanadic oxide powder was low with the organic modifiers contact probability, needed long jitter time and larger properties-correcting agent consumption; Weight ratio is excessive, then is unfavorable for the abundant dispersion of powder in dispersion medium and wetting, affects the modified effect in later stage.
In the above-mentioned vanadium dioxide nano powder surface organic modification, organic modifiers can be the organic modifiers such as stearic acid, polyacrylic acid, silane coupling agent, aluminate coupling agent or titanate coupling agent, is preferably the silane coupling agent of pbz polymer long-chain.The amount that organic modifiers adds in the mixture can be 0.05～5 % by weight; Be preferably 0.1～2 % by weight.Organically-modified long chain molecule content is too small, then can't realize the abundant parcel of powder surface; Organically-modified long chain molecule content is excessive, can cause mutually tangling between the organic molecule, affects on the contrary dispersion effect.Mode by coupling agent can make the vanadium dioxide surface connect the organic long-chain molecule, thereby greatly improves chemical stability and the dispersiveness of hypovanadic oxide powder.In addition, used dispersing auxiliary can be polyvinyl alcohol, one or more in polyvinylpyrrolidone, organic modified polyorganosiloxane dipropylene glycol monomethyl ether solution, organic silicon surfactant or fluorochemical surfactant or the dispersing auxiliary known altogether in the industry.Dispersing auxiliary is mainly used in reducing the surface tension of solution, and the raising solvent is wetting powder surface, thereby improves dispersion effect.The amount that dispersing auxiliary adds in the mixture can be 0.02～2 % by weight; Be preferably 0.05～1 % by weight.Few add-on can reach needed dispersion effect.Add the surface organic modification process that too much can affect on the contrary powder.
The preparation method of hypovanadic oxide powder slurry provided by the invention, particularly, can be with weight percent content 1～50% hypovanadic oxide powder add 40～99% the middle and high speed of dispersion medium stir carry out pre-dispersed, in mixture, add again afterwards dispersing auxiliary, the hypovanadic oxide powder slurry that high-speed stirring must mix.Can described slurry be mixed by dispersion methods such as ultrasonic, ball milling and/or sand millings in addition.
Among the present invention, no matter be in the preparation process of vanadium dioxide composite granule or in the preparation process of composite granule slurry, the rotating speed of high-speed stirring can be 1000～3000rad/min.Ultrasonic power can be 50～5000W, and frequency is 21KHz.In addition, drum's speed of rotation can be chosen as 10～2000rad/min.Again, the rotating speed of sand mill can be 10～2000rad/min.Grinding medium can be selected zirconia balls, and particle diameter is preferably the grinding medium of small particle size at 0.02mm～50mm.
Should be understood that the above-mentioned embodiment that the present invention describes in detail, and following examples only are used for explanation the present invention and are not used in and limit the scope of the invention.The raw material that adopts, reagent can marketable material or traditional chemical transform mode are synthetic to be made by buying.Unless otherwise defined or explanation, same meanings of being familiar with of all specialties used herein and scientific words and those skilled in the art.Any method and material similar to described content or that be equal to all can be applicable in the inventive method in addition.Other aspects of the present invention are because the disclosure of this paper is that appearance is intelligible to those skilled in the art.
Below, by embodiment the present invention is described in more details.
As shown in Figure 1, without the pattern of organically-modified vanadium dioxide particle, diameter of particle 10～100nm does not wait, and is that agglomerating particles exists but comparatively loose between the particle.
Embodiment 1
(1) surface organic modification of vanadium dioxide nano powder:
Get each constituent mass as follows:
Vanadium dioxide nano powder (Doped Tungsten, particle diameter 20～100nm), 20g
Ethanol (dispersion medium), 80g
Silane coupling agent (containing the polyvinyl alcohol group, organic modifiers), 1g
Polyvinylpyrrolidone (dispersing auxiliary), 0.05g;
High-speed stirring under 1500rad/min is disperseed 30min with vanadium dioxide nano powder and dispersion medium first, and ultra-sonic dispersion 30min, again dispersing auxiliary and silane coupling agent are added wherein, 70 ℃ of lower 2h that stir of constant temperature on homogenizer, again centrifugation, 60 ℃ of lower vacuum-dryings obtain the vanadium dioxide composite granule of organo-silicon coupling agent modification;
(2) preparation of vanadium dioxide composite granule slurry:
Get each constituent mass as follows:
The vanadium dioxide composite granule that makes in the present embodiment (1), 3g
Deionized water, 97.95g
The modified acroleic acid dispersion agent, 0.05g
The organic modified nano powder is added the pre-dispersed 5min of deionized water high-speed stirring, add dispersion agent ultra-sonic dispersion 30min again, stir process 1h on homogenizer obtains vanadium dioxide and Dope nano-power slurry thereof;
The salient features of resulting vanadium dioxide composite granule and slurry thereof sees Table 1 in the present embodiment.
As shown in Figure 2, the pattern of the vanadium dioxide composite granule of process organic surface modifying, diameter of particle 10～100nm does not wait, and powder is because be coated with the machine group, and the more not organically-modified particle of particle diameter increases slightly, but presents dispersion state between the powder.
Embodiment 2
(1) surface organic modification of vanadium dioxide nano powder:
Get each constituent mass as follows:
Vanadium dioxide nano powder (undopes particle diameter 20～60nm), 10g
Ethanol (dispersion medium), 90g
Stearic acid, 1g
Polyvinyl alcohol (dispersing auxiliary), 0.05g
High-speed stirring under 1500rad/min is disperseed 30min with vanadium dioxide nano powder and dispersion medium first, and ultra-sonic dispersion 30min, again dispersing auxiliary and stearic acid are added wherein, 60 ℃ of lower 2h that stir of constant temperature on homogenizer, again centrifugation, 60 ℃ of lower vacuum-dryings obtain stearic acid modified vanadium dioxide nano composite granule;
(2) preparation of vanadium dioxide composite granule slurry:
Get each constituent mass as follows:
The vanadium dioxide composite granule that makes in the present embodiment (1), 1g
Virahol, 95g
The polyacrylic acid dipersant, 0.05g
The organic modified nano powder is added the pre-dispersed 10min of deionized water high-speed stirring, add dispersion agent ultra-sonic dispersion 30min again, stir process 1h on homogenizer obtains vanadium dioxide composite granule slurry;
The salient features of resulting vanadium dioxide composite granule and slurry thereof sees Table 1 in the present embodiment.
Embodiment 3
(1) surface organic modification of vanadium dioxide nano powder:
Get each constituent mass as follows:
Vanadium dioxide nano powder (Doped Tungsten, particle diameter 20～100nm), 15g
Virahol (dispersion medium), 85g
Silane coupling agent (containing chain alkyl, organic modifiers), 1g
Organic modified polyorganosiloxane dipropylene glycol monomethyl ether solution (dispersing auxiliary), 0.08g
High-speed stirring under 1000rad/min is disperseed 20min with vanadium dioxide nano powder and dispersion medium first, and ultra-sonic dispersion 60min, again dispersing auxiliary and silane coupling agent are added wherein, 80 ℃ of lower 2h that stir of constant temperature on homogenizer, again centrifugation, 60 ℃ of lower vacuum-dryings obtain the vanadium dioxide nano composite granule that the surface is connected to chain alkyl;
(2) preparation of vanadium dioxide composite granule slurry:
Get each constituent mass as follows:
The vanadium dioxide composite granule that makes in the present embodiment (1), 15g
Ethyl acetate, 75g
The modified poly ester dispersion agent, 2.5g
The organic modified nano powder is added the pre-dispersed 5min of deionized water high-speed stirring, add dispersion agent ultra-sonic dispersion 20min again, stir process 1h on homogenizer obtains vanadium dioxide composite granule slurry;
The salient features of resulting vanadium dioxide composite granule and slurry thereof sees Table 1 in the present embodiment.
Embodiment 4
(1) surface organic modification of vanadium dioxide nano powder:
Get each constituent mass as follows:
Vanadium dioxide nano powder (doping molybdenum, particle diameter 20～100nm), 25g
Virahol (dispersion medium), 75g
Titanate coupling agent (containing epoxide group, organic modifiers), 1g
Polyvinyl alcohol (dispersing auxiliary), 0.15g
High-speed stirring under 1500rad/min is disperseed 20min with vanadium dioxide nano powder and dispersion medium first, and ultra-sonic dispersion 60min, again dispersing auxiliary and titanate coupling agent are added wherein, 80 ℃ of lower 2h that stir of constant temperature on homogenizer, again centrifugation, 70 ℃ of lower vacuum-dryings obtain the vanadium dioxide nano composite granule that the surface is connected to epoxide group;
(2) preparation of vanadium dioxide composite granule slurry:
Get each constituent mass as follows:
The vanadium dioxide composite granule that makes in the present embodiment (1), 4g
Deionized water, 96g
The modified acroleic acid dispersion agent, 0.5g
The organic modified nano powder is added the pre-dispersed 5min of deionized water high-speed stirring, add dispersion agent ultra-sonic dispersion 60min again, stir process 2h on homogenizer obtains vanadium dioxide composite granule slurry;
The salient features of resulting vanadium dioxide composite granule and slurry thereof sees Table 1 in the present embodiment.
Embodiment 5
(1) surface organic modification of vanadium dioxide nano powder:
Get each constituent mass as follows:
Vanadium dioxide nano powder (doping molybdenum, particle diameter 20～100nm), 5g
Virahol (dispersion medium), 95g
Aluminate coupling agent (containing chain alkyl, organic modifiers), 0.7g
Polyvinylpyrrolidone (dispersing auxiliary), 0.04g
High-speed stirring under 1500rad/min is disperseed 20min with vanadium dioxide nano powder and dispersion medium first, and ultra-sonic dispersion 60min, again dispersing auxiliary and aluminate coupling agent are added wherein, 80 ℃ of lower 2h that stir of constant temperature on homogenizer, again centrifugation, 60 ℃ of lower vacuum-dryings obtain the vanadium dioxide nano powder that the surface is connected to chain alkyl;
(2) preparation of vanadium dioxide composite granule slurry:
Get each constituent mass as follows:
The vanadium dioxide composite granule that makes in the present embodiment (1), 15g
Deionized water, 75g
The modified polyurethane dispersion agent, 2.5g
The organic modified nano powder is added the pre-dispersed 5min of deionized water high-speed stirring, add dispersion agent ultra-sonic dispersion 60min again, stir process 2h on homogenizer obtains vanadium dioxide composite granule slurry;
The salient features of resulting vanadium dioxide composite granule and slurry thereof sees Table 1 in the present embodiment.
Embodiment 6
(1) surface organic modification of vanadium dioxide nano powder:
Get each constituent mass as follows:
Vanadium dioxide nano powder (Doped Tungsten, particle diameter 20～100nm), 8g
Virahol (dispersion medium), 92g
Silane coupling agent (containing the halogenation chain alkyl, organic modifiers), 1g
Organic silicon surfactant (dispersing auxiliary), 0.06g
High-speed stirring under 1500rad/min is disperseed 20min with vanadium dioxide nano powder and dispersion medium first, and ultra-sonic dispersion 60min, again dispersing auxiliary and silane coupling agent are added wherein, 80 ℃ of lower 2h that stir of constant temperature on homogenizer, again centrifugation, 60 ℃ of lower vacuum-dryings obtain the vanadium dioxide nano powder that the surface is connected to the halogenation chain alkyl;
(2) preparation of vanadium dioxide composite granule slurry:
Get each constituent mass as follows:
The vanadium dioxide composite granule that makes in the present embodiment (1), 20g
Toluene, 80g
The modified polyurethane dispersion agent, 3g
The organic modified nano powder is added the pre-dispersed 5min of deionized water high-speed stirring, add dispersion agent ultra-sonic dispersion 60min again, stir process 2h on homogenizer obtains vanadium dioxide composite granule slurry;
The salient features of resulting vanadium dioxide composite granule and slurry thereof sees Table 1 in the present embodiment.
Embodiment 7
(1) surface organic modification of vanadium dioxide nano powder:
Get each constituent mass as follows:
Vanadium dioxide nano powder (Doped Tungsten, particle diameter 20～100nm), 10g
Ethanol (dispersion medium), 90g
Silane coupling agent (containing epoxy-functional, organic modifiers), 1g
Fluorochemical surfactant (dispersing auxiliary), 0.06g
High-speed stirring under 1500rad/min is disperseed 20min with vanadium dioxide nano powder and dispersion medium first, and ultra-sonic dispersion 60min, again dispersing auxiliary and silane coupling agent are added wherein, 80 ℃ of lower 2h that stir of constant temperature on homogenizer, again centrifugation, 60 ℃ of lower vacuum-dryings obtain the vanadium dioxide nano powder that the surface is connected to epoxy-functional;
(2) preparation of vanadium dioxide composite granule slurry:
Get each constituent mass as follows:
The vanadium dioxide composite granule that makes in the present embodiment (1), 5g
Deionized water, 95g
The modified acroleic acid dispersion agent, 1.5g
The organic modified nano powder is added the pre-dispersed 5min of deionized water high-speed stirring, add dispersion agent ultra-sonic dispersion 60min again, stir process 2h on homogenizer obtains vanadium dioxide composite granule slurry;
The salient features of resulting vanadium dioxide composite granule and slurry thereof sees Table 1 in the present embodiment.
Comparative example 8
Get the vanadium dioxide nano powder of the non-modified of using in above-described embodiment 7 (1), 5g
Deionization, 95g
The modified acroleic acid dispersion agent, 1.5g
To have nano-powder to add the pre-dispersed 5min of deionized water high-speed stirring, and add dispersion agent ultra-sonic dispersion 60min again, stir process 2h on homogenizer obtains the vanadium dioxide nano powder slurry;
The salient features of the prepared vanadium dioxide nano powder slurry of this comparative example sees Table 1.
Referring to following table 1, from this table organically-modified vanadium dioxide composite granule and the slurry thereof that method provided by the invention obtains can be described, its particle diameter is significantly less than unmodified powder, and the BET specific surface area is greater than unmodified powder, and Stability of Slurry also will be significantly better than unmodified powdery pulp.Can find out by the surface organic modification process by 300 ℃ of weightless data, can connect at nano powder surface 5～10% organic long-chain, thereby greatly improve chemical stability and the dispersiveness of hypovanadic oxide powder.
Table 1:
Industrial applicability: vanadium dioxide composite granule of the present invention can be applicable to prepare intelligent energy-saving coating or coating, the coating transparency of preparation is high, and low, the ageing-resistant ability of mist degree is strong, is mainly used in film, the flexible materialss such as cloth also can be used for the heat insulation occasions such as glass and exterior wall.Also can be widely used in energy-saving and emission-reduction equipment, for example energy-conservation film, energy-saving coatings, sun power temperature control unit; Or energy information equipment, for example, micro photo electric switch device, thermistor, battery material and optical information storage spare.The preparation method of vanadium dioxide composite granule provided by the invention, preparation technology's innovation, by the organic surface modifying process of organic modifiers, can effectively improve dispersiveness and the chemical stability of vanadium dioxide (vanadium dioxide) and Dope nano-power thereof.
Claims (17)
1. a hypovanadic oxide powder slurry is characterized in that, comprise,
Vanadium dioxide composite granule, described vanadium dioxide composite granule comprise that chemical constitution is V
1-xM
xO
2Vanadium dioxide nano powder, and described nano powder surface is connected to machine modification long chain molecule, wherein M is doped element, 0≤x≤0.5; And dispersion medium.
2. hypovanadic oxide powder slurry according to claim 1 is characterized in that, described organically-modified long chain molecule content is 0.1～50%.
3. hypovanadic oxide powder slurry according to claim 2 is characterized in that, described organically-modified long chain molecule content is 1～10%.
4. hypovanadic oxide powder slurry according to claim 1 is characterized in that, described organically-modified long chain molecule chain length is at 0.1nm～100nm.
5. each described hypovanadic oxide powder slurry is characterized in that according to claim 1-4, and described organically-modified long chain molecule is functionalized organic long-chain.
6. each described hypovanadic oxide powder slurry according to claim 1-4, it is characterized in that, described functionalized organic long-chain is chain alkyl, polyacrylic acid group, polyvinyl alcohol group, epoxide group, chain alkyl amine groups, halogenation chain alkyl and/or carboxylated chain alkyl.
7. each described hypovanadic oxide powder slurry is characterized in that according to claim 1～4, and described powder is the rutile phase hypovanadic oxide nano-powder, and transformation temperature is adjustable at-20～70 ℃.
8. hypovanadic oxide powder slurry according to claim 7 is characterized in that, described doped element M is or arbitrary combination near 21～30 transition element the vanadium in the periodic table of elements, tin and near element thereof and tungsten, molybdenum, ruthenium, the niobium.
9. hypovanadic oxide powder slurry according to claim 8, it is characterized in that, near 21～30 transition element in the periodic table of elements vanadium comprise scandium, titanium, chromium, manganese, iron, cobalt, nickel, copper and zinc, and described tin and near element thereof comprise indium, antimony, tin, gallium, germanium, lead and bismuth.
10. each described hypovanadic oxide powder slurry is characterized in that according to claim 1～4, and the particle size of described vanadium dioxide nano powder is below 200nm.
11. each described hypovanadic oxide powder slurry is characterized in that in the claim 1～4, the weight ratio of vanadium dioxide composite granule and dispersion medium is 1: 1～1: 1000 in the slurry.
12. hypovanadic oxide powder slurry according to claim 11 is characterized in that, the weight ratio of vanadium dioxide composite granule and dispersion medium is 1: 10～1: 100 in the slurry.
13. each described hypovanadic oxide powder slurry according to claim 1～4, it is characterized in that, also comprise dispersing auxiliary, described dispersing auxiliary is polyacrylate, polyacrylamide, polyphosphoric acid salt, polyvinyl alcohol, polyvinylpyrrolidone, modified poly ester, one or more in modified polyurethane and the modified acroleic acid dispersion agent.
14. hypovanadic oxide powder slurry according to claim 13 is characterized in that, described dispersing auxiliary accounts for 0.05～5 % by weight of described slurry total amount.
15. each described hypovanadic oxide powder slurry is characterized in that according to claim 1～4, described dispersion medium comprises or several solvents of deionized water, ethanol, propyl alcohol, Virahol, ethyl acetate, toluene, butanone.
16. preparation method who prepares each described hypovanadic oxide powder slurry in the claim 1～15, it is characterized in that, first described vanadium dioxide composite granule is added and carry out pre-dispersedly in the dispersion medium, then add described dispersion agent, mix and make described hypovanadic oxide powder slurry.
17. the preparation method of hypovanadic oxide powder slurry according to claim 16 is characterized in that, the dispersing method by high-speed stirring, ultrasonic, ball milling and/or sand milling mixes described slurry.
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