CN103937320B - Nanometer TiO2 photocatalysis self-cleaning coating suitable for background colors of building walls and preparation method thereof - Google Patents
Nanometer TiO2 photocatalysis self-cleaning coating suitable for background colors of building walls and preparation method thereof Download PDFInfo
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Abstract
The invention discloses nanometer TiO2 photocatalysis self-cleaning coating suitable for background colors of building walls and a preparation method thereof. The thickness of the coating is 10-50 micrometers, the crystal form of nanometer TiO2 in the coating is a mixed crystal form, the weight ratio of P25 powder anatase to rutile is 4:1, and a color modifier is inorganic light resistant weather-proof dye. The coating has the characteristics of being suitable for different background colors of the building walls and having the photocatalysis self-cleaning property. The preparation method is characterized in that a P25 liquid material for modifying colors is fed into thermal spraying flame by adopting a liquid material thermal spraying method and a self-made liquid material conveying device so as to prepare the coating. Compared with TiO2 coating obtained by adopting a conventional thermal spraying method, the nanometer TiO2 photocatalysis self-cleaning coating has different modifying colors and good adhesive force and is suitable for different background colors and service lives of the building walls; and as the coating is of a porous micro-nano structure, the photocatalysis self-cleaning function can be exerted favorably, and therefore the nanometer TiO2 photocatalysis self-cleaning coating has important application value and social and economic benefits.
Description
Technical field
The present invention relates to a kind of nano-TiO adapting to construction wall background color
2photocatalytic self-cleaning coating, also relates to a kind of preparation method of this coating.
Background technology
Under the overall situation advocating environmental friendliness, low-carbon economy, energy-saving and emission-reduction now, along with the raising of people's living standard, requirements at the higher level are proposed to external wall, make it gradually to the feature of environmental protection, high-decoration and functional future development, develop the important topic that high-quality coating used for building exterior wall has become current external wall industry development.Meanwhile, the pollutent now in air day by day increases, and a lot of pollutent easily attaches at building surface, and the use of automatic cleaning coating, effectively can suppress this kind of phenomenon, therefore, the automatic cleaning action of exterior wall is one of emphasis of current external wall coating research and development.
Automatic cleaning coating can make surface contaminant or dust granule Automatic-falling or removed by photocatalytic degradation under the External Force Actings such as gravity, rainwater, wind-force, has the advantages such as water saving, energy-saving and environmental protection.Based on different automatically cleaning principles, developed two class automatic cleaning coatings, a class is super-hydrophobic automatic cleaning coating, and it is rolled by water droplet and takes away dust, realizes the self-cleaning function being similar to lotus leaf.But still there is complicated process of preparation, prepare the problems such as area is little, poor mechanical property, oil-proofness pollutent ability in existing super-hydrophobic coat, lacks actual use value.Another kind of is automatic cleaning coating based on inorganic photocatalytic semiconductor material.In this class automatic cleaning coating, the most typically titanium dioxide (TiO
2) coated material, its automatically cleaning principle comprises two aspects: 1, TiO
2under ultraviolet light irradiation, produce electron-hole pair, then be adsorbed on TiO
2the H of material surface
2o and O
2redox reaction occurs and generates hydroxyl free radical, hydroxyl free radical activity is very high, and decomposable asymmetric choice net organic pollutant, realizes self-cleaning surface; 2, TiO
2super parents surface can be changed under light illumination, make pollutent and TiO
2intimate surface contact, improves photocatalysis Decomposition efficiency, is also conducive to rainwater washing away pollutent simultaneously, realizes self-cleaning surface.The acting in conjunction of these two kinds of automatically cleaning principles, TiO
2material demonstrates good automatically cleaning characteristic under practical service environment, thus has the actual use value larger than super-hydrophobic coat in automatic cleaning coating field.
TiO
2the traditional preparation methods of coating mainly contains sol-gel method, physical vaporous deposition, chemical Vapor deposition process, electrochemical method, traditional hot spray process etc., traditional preparation method or deposition lower, or technology is more complicated, to raw material with equipment requirements is higher, cost intensive, or the coating photocatalytic self-cleaning poor performance of preparation, so want to realize TiO
2the large-scale application of coating and coating possesses excellent photocatalytic self-cleaning performance, needs the TiO developing and make new advances badly
2coating and preparation method thereof.
Thermospray is a kind of efficient, effective ways that low cost prepares Large area coatings, but traditional heat spraying method must use micron powder, and coating specific surface area is little, and powder particle experience high temperature action causes TiO in spraying process
2crystal formation is irreversibly changed to Rutile Type by anatase octahedrite, and the coating photocatalysis performance of preparation is declined to a great extent.Therefore, traditional heat spraying method is difficult to the coating obtaining high-ratio surface sum high anatase content, TiO
2the performance of coating photo-catalysis function is extremely restricted.
Liquid-phase thermal spray method is that the preparation presoma of coating or suspension liquid are carried out as spraying raw material the Technology that thermospray prepares coating, powder preparation and coating preparation unite two into one by the method, simplify processing step, and take away amount of heat due to the liquid evaporation in liquid phase in spraying process and volatilization, the temperature of powder particle experience is lower, effectively can reduce the advantage of powder particle grain growth and crystal conversion.P25 mixed crystal type nanometer TiO
2powder, owing to being that two kinds of crystalline structures mix, significantly increases TiO
2intracell defect concentration, increases the concentration of current carrier, and electronics, number of cavities are increased, and makes it have stronger to be captured in TiO
2the ability of the solution components (water, oxygen, organism) on surface.In addition, owing to possessing the TiO of excellent photocatalysis performance
2color own is fine white powder, and color is single, and building masonry wall color is then rich and varied, and both not easily mate, and limits its use range.Therefore, need find out a kind of novel, big area scale to prepare, there is good adhesion, building masonry wall background color can be adapted to, and keep the TiO of excellent photocatalytic self-cleaning function
2coating has important researching value, will bring great economic results in society.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of nano-TiO adapting to construction wall background color
2photocatalytic self-cleaning coating and preparation method thereof, the advantages such as the method has simple to operate, and technical process is few, and production cost is low, can big area large-scale production, and coating adhesion is good, the excellent and coating color strong adaptability of photocatalysis performance.
In order to solve the problems of the technologies described above, the nano-TiO adapting to construction wall background color of the present invention
2photocatalytic self-cleaning coating, this coating is positioned at construction wall substrate surface, described nano-TiO
2the thickness of coating is 10-50 μm, described nano-TiO
2coating is mixed crystal type, and the weight ratio of its anatase octahedrite and rutile is 4:1, described TiO
2coating can adapt to different building masonry wall background color.
Described substrate is 316L stainless steel or 306 stainless steels or skin stone slice or construction wall wall brick.
It is that grey or Dark grey or black or safran are brown or red that described body of wall adapts to color.
The nano-TiO of construction wall background color can be adapted to described in preparation provided by the invention
2the method of photocatalytic self-cleaning coating comprises the steps:
A. P25 mixed crystal type nanometer TiO is prepared
2spraying liquid material, be that the P25 nanometer powder of 20 nm carries out magnetic agitation with deionized water and dehydrated alcohol and mixes by mean particle size, and add a certain amount of polymer binder and color modifier stirs, become finely dispersed suspension liquid material, described P25 nanometer powder crystal formation is Anatase and Rutile Type, and the weight ratio of anatase octahedrite and rutile is 4:1;
B. matrix is carried out cleaning and surface coarsening process;
C. thermal spraying treatment is carried out to matrix, on the matrix that step b processes, adopt flame spraying method, take acetylene as combustion gas, oxygen is combustion-supporting gas, after the spraying liquid material liquid material e Foerderanlage prepared in step a is atomized, adopt the outer feeding style of rifle to be transported in flame, and the throughput direction of the spraying liquid material of this atomization and thermospray flame axial direction due are 60-90 ° of angle, prepare at matrix surface the TiO that thickness is 10-50 μm
2coating.
In described step a, the volume ratio of deionized water and dehydrated alcohol is 1-5:1.
In described step a, the mass percentage content of P25 powder is 2-5 wt%, and the mass percentage content of polymer binder is 0.3-1.5 wt%, and the mass percentage of color modifier is 0.2-1.0 wt%.
In described step a, the polymer binder used for aqueous polyurethane PU or/and polyvinylpyrrolidone PVP.
In described step a, the color modifier used is inorganic fast light or weather-proof pigment.
In described step c, select flame spraying method, the scope of its spray parameters is: the pressure of combustion-supporting gas, combustion gas and assisted gas is respectively 0.4-0.7 Mpa, 0.1-0.3 Mpa and 0.3-0.6 Mpa, and flow is respectively 1.8-3.5 Nm
3/ h, 1.0-2.0 Nm
3/ h and 1.8-3.5 Nm
3/ h, the flow of spraying liquid material is 20-50 ml/min, and spray distance is 120-240 mm.
In order to characterize the nano-TiO adapting to external wall background color of the present invention
2the performance of photocatalysis coating, the coating sample of field emission scanning electron microscope (FESEM) to preparation is utilized to carry out surface topography sign, utilize the automatic scratching instrument of coating adhesion, the sticking power between this coating and substrate is characterized by coating adhesion testing method, the photocatalysis performance of concentration to this coating utilizing microplate reader to detect coating degradation methylene blue solution characterizes, utilizing nitrogen adsorption methods to detect coating specific surface area, is below concrete method for testing performance.
(1) coating substance detects mutually: by 80 ° of oven dry 3 h in the sample air dry oven of preparation, utilize X-ray diffractometer to detect its thing phase.
(2) coating morphology is observed: by the sample of preparation 80 ° of oven dry 2 h in air dry oven, be improve electron microscopic observation effect, to sample surfaces spray Au to strengthen its electroconductibility, utilize FESEM to observe its surface microscopic topographic.
(3) coating photocatalysis performance testing method: compound concentration is the methylene blue solution of 5 ppm, getting 30 ml, to be put in diameter be in 9 cm culture dish.The nano-TiO of 4 × 2.5 cm will be of a size of
2coating to be positioned in culture dish and magnetic agitation, and stirring velocity is 80 r/min.Continue to open ultraviolet lamp after 1 hour under dark condition and carry out ultraviolet lighting, ultraviolet lamp power is 15 W, and wavelength is 365 nm, and the distance of sample and ultraviolet lamp tube is 15 cm.Ultraviolet lamp open after the 0th h, 0.5 h, 1.5 h, 2.5 h, 3.5 h, 4.5 h and 5.5 h time, from culture dish, extract methylene blue solution 200 μ l with liquid-transfering gun, be placed in 96 orifice plates carry out absorbancy test and logging test results.The concentration of Methylene Blue in Solution is calculated according to the absorbance at wavelength 664 nm place.Wherein keeping under dark condition 1 hour is to make coating fully contact with methylene blue solution.Often organize sample and at least should carry out 3 experiments to reduce error.
In sum, matrix surface nano-TiO provided by the invention
2coating has porous surface micro nano structure, and obvious transformation does not occur powder crystal formation, is conducive to the photocatalytic self-cleaning performance playing coating, adds color modifier adjustable nano-TiO
2coating color, is conducive to adapting to building masonry wall background color, has important application, be expected to produce great economic results in society in building surface functionalization field.The present invention and TiO conventional at present
2coating and preparation method thereof is compared, and tool has the following advantages:
(1) by nano-TiO
2liquid material directly sends into thermospray flame, overcomes the shortcoming of nano-powder not easily direct spraying, decreases mist projection granulating process, the coating of preparation still can keep crystalline structure and the nano-scale of starting powder, be combined well with matrix, and coated porous has high-specific surface area, be beneficial to and play TiO
2photocatalytic self-cleaning performance advantage.
(2) as preferably, TiO prepared by liquid material flame spraying method is adopted
2coating, equipment and process simply, is easily controlled, and coating sedimentation effect is high, low production cost, and coating can big area be prepared, and is convenient to the advantages such as industrialization scale operation.
(3) color modifier is added, dexterously by pure white TiO
2coating and rich and varied color combine, and the coating color and the original background color of building masonry wall that effectively realize acquisition match, and are beneficial to the application of this coating in building surface functionalization field.
Accompanying drawing explanation
Fig. 1 is the nano-TiO that the present invention can adapt to construction wall background color
2the preparation process schematic diagram of photocatalytic self-cleaning coating;
Fig. 2 is the nano-TiO of adapted to construction wall background color obtained in the embodiment of the present invention 1
2the XRD figure spectrum of photocatalytic self-cleaning coating;
Fig. 3 is the nano-TiO of adapted to construction wall background color obtained in the embodiment of the present invention 1
2the surface microscopic FESEM shape appearance figure of photocatalytic self-cleaning coating;
Fig. 4 is the nano-TiO of adapted to construction wall background color obtained in the embodiment of the present invention 1
2photocatalytic self-cleaning coating degradation Methylene blue solution conditions, wherein, has the curve of round dot to be the P25 coating adding gray color modifier, has the curve of rectangular block to be pure P25 coating.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail, it is pointed out that the following stated embodiment is intended to be convenient to the understanding of the present invention, and any restriction effect is not play to it.
embodiment 1
In the present embodiment, body material is the 316L stainless steel substrates of thickness about 2 mm, the nano-TiO of this matrix surface
2the thickness of coating is 40 μm, TiO in this coating
2crystalline phase component is Anatase and Rutile Type, and according to massfraction meter, Detitanium-ore-type accounts for 80%, and coating is combined with matrix well, and coatingsurface is porous micro nano structure.Concrete preparation method is as follows for this coating:
1, by deionized water and dehydrated alcohol 4:1 mixing by volume wiring solution-forming, be that the P25 nanometer powder of 20 nm adds in the above-mentioned solution prepared by 3 wt% by commercially available mean particle size, magnetic agitation mixes, aqueous polyurethane solution PU, polyvinylpyrrolidone PVP and gray color modifier are added in the above-mentioned mixed solution prepared by 0.7 wt%, 0.13wt% and 0.3wt% respectively, magnetic agitation mixes;
2, matrix is cleaned, adopt 60 order corundum sands to carry out surface sand-blasting roughening treatment, make its roughness reach spraying requirement, improve the coating of spraying and the bonding strength of matrix;
3, adopt flame spraying method that liquid material to be sprayed is sprayed to matrix surface, obtain the nano-TiO of the grey of thickness about 40 μm
2photocatalysis coating, wherein, the spray parameters controlling flame spraying gun is: combustion-supporting gas O
2, combustion gas is acetylene, assisted gas is that compressed-air actuated pressure is respectively 0.5Mpa, 0.1Mpa, 0.3Mpa, flow is respectively 3.0Nm
3/ h, 1.5Nm
3/ h, 2.0Nm
3/ h, liquid material atomization compressed air pressure is 0.4MPa, and flow is 30ml/min, and spray distance is 150mm.
To the TiO that receives of the adapted to construction wall background color of the above-mentioned matrix surface prepared
2photocatalytic self-cleaning coating carries out following performance test:
(1) coating substance phase: utilize X-ray diffractometer (XRD) to detect coating substance phase structure, Fig. 2 is the XRD figure spectrum of obtained coating in the present embodiment, as seen from the figure, mainly Anatase and Rutile Type in coating, and the weight ratio of anatase octahedrite and rutile is 4:1, consistent with Anatase in original P25 powder and Rutile Type, the TiO adopting liquid material flame spraying process can obtain stable mixing crystal formation is described
2coating.
(2) coating morphology is observed: utilize field emission scanning electron microscope to observe its surface microscopic topographic, and Fig. 3 is the surperficial FESEM photo of obtained coating in the present embodiment, coating mainly porous micro nano structure as seen from the figure.Coatingsurface is grey, is applicable to grey building wall surface.
(3) coating photocatalysis performance: utilize microplate reader to detect the methylene blue solution of coating photocatalytic degradation, the curve that Fig. 4 does for coating degradation methylene blue solution different time node obtained in the present embodiment, as seen from the figure, add gray color modifier not have a negative impact to coating photocatalysis performance, compared with pure P25 coating, its photocatalysis performance keeps good.In addition, analyze from degradation rate, coating degrades the methylene blue solution of about 61% when 0.5 h, degrade about 90% methylene blue solution during 5.5 h, and this coating photocatalytic self-cleaning excellent performance is described.
embodiment 2
In the present embodiment, body material is the 316L stainless steel substrates that thickness is about 2mm, and the thickness of the nano-TiO_2 coatings of this matrix surface is 50 μm, TiO in this coating
2crystalline phase component is Anatase and Rutile Type, and according to massfraction meter, Detitanium-ore-type accounts for 80%, and coating is combined with matrix well, and coatingsurface is porous micro nano structure.The concrete preparation method of this coating is as follows:
1, by deionized water and dehydrated alcohol 1:1 mixing by volume wiring solution-forming, be that the P25 nanometer powder of 20nm adds in the above-mentioned solution prepared by 5 wt% by commercially available mean particle size, magnetic agitation mixes, aqueous polyurethane solution PU, polyvinylpyrrolidone PVP and gray color modifier are added in the above-mentioned mixed solution prepared by 0.6 wt%, 0.2wt% and 0.5wt% respectively, magnetic agitation mixes;
2, matrix is cleaned, adopt 60 order corundum sands to carry out surface sand-blasting roughening treatment, make its roughness reach spraying requirement, improve the coating of spraying and the bonding strength of matrix;
3, adopt flame spraying method that liquid material to be sprayed is sprayed to matrix surface, obtain the nano-TiO of the grey of thickness about 50 μm
2photocatalysis coating.Wherein, the spray parameters controlling flame spraying gun is: combustion-supporting gas O
2, combustion gas is acetylene, assisted gas is that compressed-air actuated pressure is respectively 0.5Mpa, 0.1Mpa, 0.3Mpa, flow is respectively 3.5Nm
3/ h, 1.5Nm
3/ h, 3.5Nm
3/ h, liquid material atomization compressed air pressure is 0.4MPa, and flow is 30ml/min, and spray distance is 120mm.
To the nano-TiO of the adapted to external wall background color of the above-mentioned matrix surface prepared
2photocatalytic self-cleaning coating carries out following performance test:
(1) coating substance phase: utilize X-ray diffractometer (XRD) to detect coating substance phase structure, to confirm in coating mainly Anatase and Rutile Type, and the weight ratio of anatase octahedrite and rutile is 4:1, consistent with Anatase in original P25 powder and Rutile Type, illustrate and adopt liquid material flame spraying process can obtain stable TiO
2coating.
(2) coating morphology is observed: utilize field emission scanning electron microscope to observe its surface microscopic topographic, and in visible the present embodiment, the surface of obtained coating is porous micro nano structure, is conducive to the performance of photocatalysis performance.Visual inspection coatingsurface is Dark grey, is applicable to Dark grey building wall surface.
(3) coating photocatalysis performance: utilize microplate reader to detect the methylene blue solution of coating photocatalytic degradation, confirm that adding gray color modifier does not have an impact to coating photocatalysis performance, compared with pure P25 coating, its photocatalysis performance keeps good.In addition, analyze from degradation rate, add the P25 coating of 0.5wt% color modifier, during 0.5h, degrade the methylene blue solution of about 55%, during 5.5h, degrade the methylene blue solution of about 86%, this coating photocatalytic self-cleaning excellent performance is described.
embodiment 3
In the present embodiment, body material is the 316L stainless steel substrates that thickness is about 2mm, the nano-TiO of this matrix surface
2the thickness of coating is 20 μm, TiO in this coating
2crystalline phase component is Anatase and Rutile Type, and according to massfraction meter, Detitanium-ore-type accounts for 80%, and coating is combined with matrix well, and coatingsurface is porous micro nano structure.This TiO
2the concrete preparation method of coating is as follows:
1, by deionized water and dehydrated alcohol 1:1 mixing by volume wiring solution-forming, be that the P25 nanometer powder of 20nm adds in the above-mentioned solution prepared by 5wt% by commercially available mean particle size, magnetic agitation mixes, aqueous polyurethane solution PU and safran color modifier are added in the above-mentioned mixed solution prepared by 1.2wt% and 0.4wt% respectively, magnetic agitation mixes;
2, matrix is cleaned, adopt 60 order corundum sands to carry out surface sand-blasting roughening treatment, make its roughness reach spraying requirement, improve the coating of spraying and the bonding strength of matrix;
3, adopt flame spraying method that liquid material to be sprayed is sprayed to matrix surface, obtain the safran nano-TiO of thickness about 20 μm
2photocatalysis coating, wherein, the spray parameters controlling flame spraying gun is: combustion-supporting gas O
2, combustion gas is acetylene, assisted gas is that compressed-air actuated pressure is respectively 0.5Mpa, 0.1Mpa, 0.3Mpa, flow is respectively 3.5Nm
3/ h, 1.5Nm
3/ h, 3.0Nm
3/ h, liquid material atomization compressed air pressure is 0.5MPa, and flow is 40ml/min, and spray distance is 180mm.
To the nano-TiO of the adapted to external wall background color of the above-mentioned matrix surface prepared
2photocatalytic self-cleaning coating carries out following performance test:
(1) coating substance phase: utilize X-ray diffractometer (XRD) to detect coating substance phase structure, to confirm in coating mainly Anatase and Rutile Type, and the weight ratio of anatase octahedrite and rutile is 4:1, consistent with Anatase in original P25 powder and Rutile Type, illustrate and adopt liquid material flame spraying process can obtain stable TiO
2coating.
(2) coating morphology is observed: utilize field emission scanning electron microscope to observe its surface microscopic topographic, and in proved embodiment, the surface of obtained coating is porous micro nano structure, is conducive to the performance of photocatalysis performance.Visual inspection coatingsurface is safran, is applicable to safran building wall surface.
(3) coating photocatalysis performance: utilize microplate reader to detect the methylene blue solution of coating photocatalytic degradation, confirm that adding grey staining agent does not have an impact to coating photocatalysis performance, compared with pure P25 coating, its photocatalysis performance keeps good.In addition, analyze from degradation rate, add the P25 coating of 1.2wt% color modifier, during 0.5h, degrade the methylene blue solution of about 50%, during 5.5h, degrade the methylene blue solution of about 80%, this coating photocatalytic self-cleaning excellent performance is described.
embodiment 4
In the present embodiment, body material is the stone slice used for building exterior wall that thickness is about 20mm, and the surface color of this stone material own is the TiO of safran, this matrix surface
2the thickness of coating is 30 μm, TiO in this coating
2crystalline phase component is Anatase and Rutile Type, and according to massfraction meter, Detitanium-ore-type accounts for 80%, and coating is combined with matrix well, and coatingsurface is porous micro nano structure.This TiO
2the concrete preparation method of coating is as follows:
1, by deionized water and dehydrated alcohol 3:1 mixing by volume wiring solution-forming, be that the P25 nanometer powder of 20nm adds in the above-mentioned solution prepared by 3.3wt% by commercially available mean particle size, magnetic agitation mixes, aqueous polyurethane solution PU, polyvinylpyrrolidone PVP and safran color modifier are added in the above-mentioned mixed solution prepared by 0.8 wt%, 0.12wt% and 0.33wt% respectively, magnetic agitation mixes;
2, matrix is cleaned, due to the surface irregularity of construction wall stone material own, meet thermospray requirement, so do not adopt 60 order corundum sands to carry out surface sand-blasting roughening treatment;
3, adopt flame spraying method that liquid material to be sprayed is sprayed to matrix surface, obtain the safran TiO of thickness about 30 μm
2photocatalysis coating, wherein, the spray parameters controlling flame spraying gun is: combustion-supporting gas O
2, combustion gas is acetylene, assisted gas is that compressed-air actuated pressure is respectively 0.5Mpa, 0.1Mpa, 0.3Mpa, flow is respectively 3.5Nm
3/ h, 1.5Nm
3/ h, 3.0Nm
3/ h, liquid material atomization compressed air pressure is 0.5MPa, and flow is 30ml/min, and spray distance is 160mm.
To the nano-TiO of the adapted to construction wall background color of the above-mentioned matrix surface prepared
2photocatalytic self-cleaning coating carries out following performance test:
(1) coating substance phase: utilize X-ray diffractometer (XRD) to detect coating substance phase structure, to confirm in coating mainly Anatase and Rutile Type, and the weight ratio of anatase octahedrite and rutile is 4:1, consistent with Anatase in starting powder and Rutile Type, illustrate and adopt liquid material flame spraying process can obtain stable TiO
2coating.
(2) coating morphology is observed: utilize field emission scanning electron microscope to observe its surface microscopic topographic, and in proved embodiment, the surface of obtained coating is porous micro nano structure, is conducive to the performance of photocatalysis performance.Visual inspection coatingsurface is safran, more consistent with stone material intrinsic colour, is applicable to the skin surface of this kind of color.
(3) coating photocatalysis performance: utilize microplate reader to detect the methylene blue solution of coating photocatalytic degradation, confirm that adding grey staining agent does not have an impact to coating photocatalysis performance, compared with pure P25 coating, its photocatalysis performance keeps good.In addition, analyze from degradation rate, add the P25 coating of 0.33wt% color modifier, during 0.5h, degrade the methylene blue solution of about 56%, during 5.5h, degrade the methylene blue solution of about 86%, this coating photocatalytic self-cleaning excellent performance is described.
embodiment 5
The present embodiment is substantially the same manner as Example 4, difference is that in the present embodiment, body material is the wall brick used for building exterior wall of thickness about 6 mm, and the surface color of this stone material own is Dark grey, polymer binder selects aqueous polyurethane solution PU, polyvinylpyrrolidone PVP and safran color modifier respectively by 0.67wt%, 0.10wt% and 0.50wt%, and other experiment conditions are consistent with embodiment 1.
Utilize X-ray diffractometer (XRD) to detect coating substance phase structure, to confirm in coating mainly Anatase and Rutile Type, and the weight ratio of anatase octahedrite and rutile is 4:1.
Utilize field emission scanning electron microscope to observe its surface microscopic topographic, in proved embodiment, the surface of obtained coating is porous micro nano structure, is conducive to the performance of photocatalysis performance.Visual inspection coatingsurface is Dark grey, more consistent with stone material intrinsic colour, is applicable to the building wall surface of this kind of color.
Utilize microplate reader to detect the methylene blue solution of coating photocatalytic degradation, confirm that adding grey staining agent does not have an impact to coating photocatalysis performance, compared with pure P25 coating, its photocatalysis performance keeps good.In addition, analyze from degradation rate, add the P25 coating of 0.50 wt% color modifier, degrade the methylene blue solution of about 60% during 0.5 h, during 5.5 h, degrade about 90% methylene blue solution, this coating photocatalytic self-cleaning excellent performance is described.
Above-described embodiment has been described in detail technical scheme of the present invention and beneficial effect; be understood that and the foregoing is only specific embodiments of the invention; be not limited to the present invention; all any amendments and improvement etc. made in spirit of the present invention, all should be included within protection scope of the present invention.
Claims (6)
1. prepare the nano-TiO that can adapt to construction wall background color for one kind
2the method of photocatalytic self-cleaning coating, this coating is positioned at construction wall substrate surface, described nano-TiO
2the thickness of coating is 10-50 μm, described nano-TiO
2coating is mixed crystal type, and the weight ratio of its anatase octahedrite and rutile is 4:1, described TiO
2coating can adapt to different building masonry wall background color; It is characterized in that comprising the steps:
A. P25 mixed crystal type nanometer TiO is prepared
2spraying liquid material, be that the P25 nanometer powder of 20 nm carries out magnetic agitation with deionized water and dehydrated alcohol and mixes by mean particle size, and add a certain amount of polymer binder and color modifier stirs, become finely dispersed suspension liquid material, described P25 nanometer powder crystal formation is Anatase and Rutile Type, and the weight ratio of anatase octahedrite and rutile is 4:1;
B. cleaning and surface coarsening process are carried out in substrate;
C. thermal spraying treatment is carried out to substrate, on the matrix that step b processes, adopt flame spraying method, take acetylene as combustion gas, oxygen is combustion-supporting gas, after the spraying liquid material liquid material e Foerderanlage prepared in step a is atomized, adopt the outer feeding style of rifle to be transported in flame, and the throughput direction of the spraying liquid material of this atomization and thermospray flame axial direction due are 60-90 ° of angle, prepare at matrix surface the TiO that thickness is 10-50 μm
2coating.
2. method according to claim 1, is characterized in that: in described step a, and the volume ratio of deionized water and dehydrated alcohol is 1-5
:1.
3. method according to claim 1, it is characterized in that: in described step a, the mass percentage content of P25 nanometer powder is 2-5 %, and the mass percentage content of polymer binder is 0.3-1.5 %, and the mass percentage of color modifier is 0.2-1.0 %.
4. method according to claim 1, is characterized in that: in described step a, the polymer binder used for aqueous polyurethane PU or/and polyvinylpyrrolidone PVP.
5. method according to claim 1, is characterized in that: in described step a, and the color modifier used is inorganic fast light or weather-proof pigment.
6. method according to claim 1, it is characterized in that: in described step c, select flame spraying method, the scope of its spray parameters is: the pressure of combustion-supporting gas, combustion gas and assisted gas is respectively 0.4-0.7 Mpa, 0.1-0.3 Mpa and 0.3-0.6 Mpa, and flow is respectively 1.8-3.5 Nm
3/ h, 1.0-2.0 Nm
3/ h and 1.8-3.5 Nm
3/ h, the flow of spraying liquid material is 20-50 ml/min, and spray distance is 120-240 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410181753.7A CN103937320B (en) | 2014-05-04 | 2014-05-04 | Nanometer TiO2 photocatalysis self-cleaning coating suitable for background colors of building walls and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410181753.7A CN103937320B (en) | 2014-05-04 | 2014-05-04 | Nanometer TiO2 photocatalysis self-cleaning coating suitable for background colors of building walls and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103937320A CN103937320A (en) | 2014-07-23 |
| CN103937320B true CN103937320B (en) | 2015-07-15 |
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