CN112409897A - Super-hydrophilic passive self-cleaning coating and preparation method and application thereof - Google Patents

Super-hydrophilic passive self-cleaning coating and preparation method and application thereof Download PDF

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CN112409897A
CN112409897A CN202011230578.8A CN202011230578A CN112409897A CN 112409897 A CN112409897 A CN 112409897A CN 202011230578 A CN202011230578 A CN 202011230578A CN 112409897 A CN112409897 A CN 112409897A
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parts
hydrophilic
cleaning
coating
passive self
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汪远昊
兰天
龙江
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Jiangxi Changhao Industrial Co ltd
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Jiangxi Changhao Industrial Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D171/00—Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D171/02—Polyalkylene oxides
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/006—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character
    • C03C17/008—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character comprising a mixture of materials covered by two or more of the groups C03C17/02, C03C17/06, C03C17/22 and C03C17/28
    • C03C17/009—Mixtures of organic and inorganic materials, e.g. ormosils and ormocers
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    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/32—Radiation-absorbing paints
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
    • C03C2217/44—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the composition of the continuous phase
    • C03C2217/445—Organic continuous phases
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    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
    • C03C2217/46—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase
    • C03C2217/47—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase consisting of a specific material
    • C03C2217/475—Inorganic materials
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    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
    • C03C2217/46—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase
    • C03C2217/47—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase consisting of a specific material
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    • C03C2217/477—Titanium oxide
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    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
    • C03C2217/46—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase
    • C03C2217/47—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase consisting of a specific material
    • C03C2217/475—Inorganic materials
    • C03C2217/478—Silica
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
    • C03C2217/46—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase
    • C03C2217/48—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase having a specific function
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    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/70—Properties of coatings
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    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2218/00—Methods for coating glass
    • C03C2218/10—Deposition methods
    • C03C2218/11—Deposition methods from solutions or suspensions
    • C03C2218/112—Deposition methods from solutions or suspensions by spraying
    • C—CHEMISTRY; METALLURGY
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
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Abstract

The invention generally relates to the technical field of self-cleaning materials, and provides a super-hydrophilic passive self-cleaning coating and a preparation method thereof, a preparation method of the coating, and super-hydrophilic passive self-cleaning glass based on the coating; the coating comprises the following components in parts by weight: 19-32 parts of nano titanium dioxide, 12-23 parts of nano silicon dioxide, 4-10 parts of graphene oxide, 6-15 parts of dispersing agent, 39-68 parts of deionized water, 4-10 parts of film forming agent, 1-3 parts of inhibitor and 1.2-3.6 parts of ultraviolet absorbent; wherein the ultraviolet absorbent comprises any one of UVT-150, octyl triazone and ethylhexyl triazone.

Description

Super-hydrophilic passive self-cleaning coating and preparation method and application thereof
Technical Field
The invention relates to the technical field of self-cleaning materials, in particular to a super-hydrophilic passive self-cleaning coating and a preparation method and application thereof.
Background
The environmental pollution seriously affects the normal life of people and troubles the development of social economy, the pollution of the outer surface of the building not only affects the beauty of the building, but also increases the maintenance cost, and the pollution resistance becomes an important index for evaluating the quality of the coating of the outer wall of the building; and for various current solar power stations, the problems of cleaning are also troubled, and the generated energy is directly influenced. Therefore, self-cleaning becomes a hot spot, and directly coating a layer of transparent self-cleaning paint on the surface of glass becomes one of the direct approaches to solve the problem.
TiO compounds for recent years2The star molecule has the advantages of no toxicity, stable chemical property, high catalytic activity, low cost and the like, and has great development potential in the fields of self-cleaning coatings, sewage treatment, air purification and the like. TiO 22The coating has super-hydrophilicity (the water contact angle is close to zero), and organic pollutants attached to the surface of the coating can be decomposed in a photocatalytic manner under the irradiation of ultraviolet light. When TiO is present2When illuminated by ultraviolet light, electrons in the valence band are excited onto the conduction band, leaving holes. The concentration of photo-induced carriers (electrons or holes) and their capture by surface defects is TiO2The main cause of photo-hydrophilicity of the surface. The photo-generated electrons can oxidize the electron acceptor, and the holes can reduce the electron donor to form hydroxyl radical (. OH) and superoxide anion radical (O)2-) And hydrogen peroxide (H)2O2) Etc., thereby activating the decomposition of the contaminants. TiO 22The photocatalytic reaction and the photo-induced hydrophilic properties of the surface are related to its adsorption of water and molecular oxygen under light and the formation of a large number of hydroxyl radicals. TiO 22The super-hydrophilicity is that under the excitation of ultraviolet light, water drops on the surface can diffuse and flow, so that the water can carry away dirt on the surface.
But TiO 22The lack of visible light response and high charge carrier recombination limits its wide use. However, the use of graphene or its derivatives on TiO2The visible light response material can be prepared by modification. In TiO2In the/graphene hybrid synthesis, Graphene Oxide (GO) is widely used as a graphene source due to its ease of solution synthesis. In addition, the optical and electrical properties of GO can be adjusted by controlling the degree of reduction during the hybrid preparation processAnd (4) quality. TiO thus obtained2The reduced graphene oxide hybrid material has strong electron overlap and high interface binding energy, so that a light-induced carrier can be separated from TiO2The separation of the photon-generated carriers is one of the key factors for improving the photocatalytic performance of the hybrid material when the photo-generated carriers are transferred to graphene. In addition, the presence of Reduced Graphene Oxide (RGO) in the hybrid material may reduce TiO2Thereby improving the visible light response.
In addition, with the development of science and technology, high-altitude glass is also frequently used for outdoor research work, and a lot of dust and sundries are inevitably accumulated when the high-altitude glass is used for a long time. Although these problems are reasonable to open up the use of TiO2Idea to prepare super hydrophilic self-cleaning coatings, but pure TiO2The coating can only be irradiated for a certain time under ultraviolet light with certain intensity to obtain super-hydrophilicity. However, the proportion of ultraviolet light in a natural light source is small, and the application of the titanium dioxide super-hydrophilic coating is severely limited due to the fact that the coating loses the hydrophilic characteristic for several days caused by certain time of ultraviolet induction and no ultraviolet induction, so that the problem that the development of the clean coating with lasting super-hydrophilic performance under the natural light is needed to be solved urgently at the present stage.
Disclosure of Invention
The invention aims to solve the problems of poor durability and hydrophilicity of a super-hydrophilic coating on the surface of glass in the prior art, and provides a super-hydrophilic self-cleaning coating, a preparation method thereof and a preparation method of super-hydrophilic passive self-cleaning glass2The coating has super-hydrophilic self-cleaning capability, has long-term retention capability under no visible light irradiation, has excellent final hydrophilic effect, has excellent self-cleaning capability on glass with the coating applied on the surface, is super-hydrophilic self-cleaning coating, and has large-scale productionThe potential of (2).
The invention has the technical scheme that the super-hydrophilic passive self-cleaning coating comprises the following components in parts by weight: 19-32 parts of nano titanium dioxide, 12-23 parts of nano silicon dioxide, 4-10 parts of graphene oxide, 6-15 parts of a dispersing agent, 39-68 parts of deionized water, 4-10 parts of a film forming agent and 1-3 parts of an inhibitor.
Further, the super-hydrophilic passive self-cleaning coating also comprises 1.2 to 3.6 parts by weight of ultraviolet absorbent.
Furthermore, the nano titanium dioxide has the particle size of 20-40nm and the purity of 99 wt%, and is purchased from pioneer nano.
Further, the above-mentioned nano silica has a particle size of 20nm and a purity of 99 wt%, and is purchased from pioneer nanometer.
Further, the lateral dimension of the graphene oxide is 5-15 mm.
Further, the dispersant comprises the following components in parts by weight: 3-9 parts of acrylic acid, 2-10 parts of ethyl acetate, 2-5 parts of benzotriazole, 4-9 parts of polyacrylamide, 2-6 parts of hydroxyethylidene diphosphonic acid and 1-3 parts of Guel gum.
The dispersing agent has good dispersing ability, prevents the sedimentation and the agglomeration of paint particles, has stable dispersion, ensures that the paint is uniformly coated and distributed, can effectively reduce the surface tension of a water system, and has strong oxidation resistance.
Further, the film forming agent comprises the following components in percentage by weight: 5-15% of polyethylene glycol, 2-8% of silane coupling agent, 0.1-0.9% of hole sealing agent, 1-2% of film forming additive, 1-3% of oxidant, 0.8-1.5% of complexing agent and 0.5-0.9% of glycerol.
The importance of the film-forming agent is self-evident, which makes the coating materials prepared above very good in film-forming quality.
Further, the inhibitor comprises any one of methyl salicylate, benzophenone, benzotriazole, acetylacetone, diethanolamine and triethanolamine.
The inhibitor of the invention can inhibit and delay substances which cause photo-aging of polymers by ultraviolet rays.
Further, the ultraviolet absorber includes any one of UVT-150, octyl triazone, and ethylhexyl triazone.
The UV absorber can strongly and selectively absorb UV light and convert the UV light into harmless low-energy radiation.
The invention also provides a preparation method of the super-hydrophilic passive self-cleaning coating, which comprises the following steps:
s1: adding hydrophilic nano titanium dioxide, nano silicon dioxide, graphene oxide and a dispersing agent into absolute ethyl alcohol, and magnetically stirring for 60min to obtain a black solution A;
s2, mixing the film forming agent and the inhibitor, and magnetically stirring for 30min to obtain a solution B;
s3, slowly dripping the solution B into the solution A, and continuously stirring for 60min to obtain a black ink uniformly-dispersed sol C;
s4, adding an ultraviolet absorbent into the solution obtained in the step S3, heating at 50 ℃ and magnetically stirring for 60min to obtain the super-hydrophilic passive self-cleaning coating.
The invention also provides a preparation method of the super-hydrophilic passive self-cleaning glass, which uses the super-hydrophilic passive self-cleaning coating obtained in the preparation method of the super-hydrophilic passive self-cleaning coating, and comprises the following steps:
step 1, ultrasonically cleaning a glass substrate in isopropanol, absolute ethyl alcohol and 30% hydrogen peroxide for 10min in sequence, and drying at room temperature for later use;
step 2, coating the super-hydrophilic passive self-cleaning coating on the glass substrate treated in the step 1 by adopting a spraying method; then drying in a ventilation drying oven at 50 ℃ for 6 hours;
and 3, continuously coating the film treated in the step 2 with the super-hydrophilic passive self-cleaning coating by adopting a spraying method: then drying in a ventilation drying oven at 50 ℃ for 6 hours;
and 4, naturally cooling to obtain the super-hydrophilic passive self-cleaning glass.
The invention has the beneficial effects that:
1. the invention discloses a super-hydrophilic passive self-cleaning coating formula, which comprises the following components in part by weight: tong (Chinese character of 'tong')Per in SiO2-TiO2The ultraviolet absorbent and hydrophilic group, nano TiO are introduced into/GO hybrid coating liquid2The combination with the ultraviolet absorbent produces excellent sustainable ultraviolet absorption performance, and TiO is excited by ultraviolet2The long-term use of the coating provides a powerful posterior shield while increasing the hydrophilicity of the coating, and further increases the response of the coating to lower energy light (e.g., natural visible light) and the extended retention time of hydrophilicity. The Graphene Oxide (GO) can adjust the optical and electrical properties and optical adjustment properties of GO by controlling the reduction degree, wherein the adjustment of the optical properties refers to the change of the transmittance and the energy band gap of the graphene so as to improve the photocatalytic performance of the graphene; the electrical property refers to adjusting the resistivity of graphene and improving the mobility of electrons in the catalysis process, so that the photocatalysis performance is improved.
2. The film-forming agent in the formula of the super-hydrophilic passive self-cleaning coating enhances the moldability, and a film with a compact structure is formed after the coating is sprayed; the addition of a small amount of inhibitor effectively inhibits and delays the photoaging of the absorber by ultraviolet light, and can strongly and selectively absorb ultraviolet light to convert the ultraviolet light into harmless low-energy radiation.
3. The super-hydrophilic passive self-cleaning coating formula can obtain a super-hydrophilic self-cleaning coating film by simple spraying, coating, soaking and other methods; the preparation process is simple, and the prepared SiO is suitable for large-scale production2-TiO2the/GO hybrid coating liquid is excited by ultraviolet in natural light to endow the coating liquid with self-cleaning and super-hydrophilic capabilities; the obtained coating has high purity, uniform texture and low cost, is suitable for large-area film making, has great economic and social benefits, is safer and more environment-friendly, and is environment-friendly.
4. The super-hydrophilic passive self-cleaning glass based on the super-hydrophilic passive self-cleaning coating has the advantages of good light transmittance, strong hydrophilic property, good antifogging property, strong self-cleaning capability, touch capability and the like. Meanwhile, the invention provides the super-hydrophilic coating.
Drawings
These and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the following detailed description of the embodiments of the invention, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a transmission spectrum (TSG: TiO) of a superhydrophilic passive self-cleaning glass obtained in an example of the present invention2-SiO2/GO)。
FIG. 2 is a schematic cross-sectional view of the contact angle between the super-hydrophilic passive self-cleaning glass and water in the embodiment of the invention.
FIG. 3 is an SEM representation of the coating on the surface of the superhydrophilic passive self-cleaning glass in an embodiment of the invention: wherein (a) is TiO2-SiO2-GO ratio of 1:0.5: 0.1; (b) is TiO2-SiO2-GO ratio of 1:0.5: 1; (c) is TiO2-SiO2-GO ratio of 1:0.5: 0.5;
11-a glass substrate; 12-super hydrophilic passive self-cleaning coating; 21-super hydrophilic water film.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Example 1:
a preparation method of super-hydrophilic passive self-cleaning paint and super-hydrophilic passive self-cleaning glass comprises the following steps:
(1) adding 6.0g of hydrophilic nano titanium dioxide, 3.0g of nano silicon dioxide, 0.6g of graphene oxide and 10g of dispersing agent into 50g of absolute ethyl alcohol, and magnetically stirring for 60min to obtain a black solution A;
(2) mixing 3.8g of film forming agent and 0.18g of inhibitor, and magnetically stirring for 30min to obtain a solution B;
(3) slowly dripping the solution B into the solution A after stirring for 60min, and continuously stirring for 60min to obtain sol C with uniformly dispersed black ink;
(4) and (3) adding 3.6g of ultraviolet absorbent UVT-150 into the solution obtained in the step (3), heating at 50 ℃ and magnetically stirring for 60min to obtain sol D, namely the super-hydrophilic passive self-cleaning coating.
(5) Ultrasonically cleaning a high-altitude glass substrate in isopropanol, absolute ethyl alcohol and 30% hydrogen peroxide for 10min in sequence, and drying at room temperature for later use;
(6) coating the sol obtained in the step (4) on the high-altitude glass substrate obtained in the step (5) by adopting a spraying method; immediately placing the mixture into a ventilation drying oven to dry for 6 hours at 50 ℃, and repeating the operations of spraying and drying for 1 time; and naturally cooling to obtain the super-hydrophilic passive self-cleaning glass.
Hydrophilic nano titanium dioxide in this example: nano silicon dioxide: and (3) graphene oxide: inhibitor (B): the mass ratio of the ultraviolet absorbent is 1:0.5:0.1:0.03: 0.6.
Example 2:
the main technical solution of this embodiment is substantially the same as that of embodiment 1, and the features that are not explained in this embodiment adopt the explanations in embodiment 1, and are not described herein again. The present embodiment is different from embodiment 1 in that:
hydrophilic nano titanium dioxide in this example: nano silicon dioxide: and (3) graphene oxide: inhibitor (B): the mass ratio of the ultraviolet absorbent is 1:0.5:1:0.06: 0.3.
The ultraviolet absorbent is octyl triazone.
Example 3:
the main technical solution of this embodiment is substantially the same as that of embodiment 1, and the features that are not explained in this embodiment adopt the explanations in embodiment 1, and are not described herein again. The present embodiment is different from embodiment 1 in that:
hydrophilic nano titanium dioxide in this example: nano silicon dioxide: and (3) graphene oxide: inhibitor (B): the mass ratio of the ultraviolet absorbent is 1:0.5:0.5:0.09: 0.9.
The ultraviolet absorbent is ethylhexyl triazone.
The transmission spectrum of the super-hydrophilic passive self-cleaning glass obtained in the embodiment of the invention is shown in figure 1, and it can be seen that: the transmittance of the glass reaches the maximum transmittance when the GO ratio is 0.1, and the glass has the most beneficial photocatalytic self-cleaning performance;
the schematic cross-sectional view of the test of the contact angle between the super-hydrophilic passive self-cleaning glass and water obtained in the embodiment of the invention is shown in FIG. 2, and it can be seen that the contact angle theta is less than 17.6 degrees, and the hydrophilicity is good;
fig. 3 is an SEM characterization diagram of the super-hydrophilic passive self-cleaning coating on the surface of the super-hydrophilic passive self-cleaning glass in the embodiment of the present invention, and it can be seen that, in the diagram (a), the coating is uniformly dispersed and has uniform nano-size, which is consistent with the result shown in fig. 1, and it should be again confirmed that 0.1-ratio of GO doping has a significant benefit for improving the photocatalytic performance of the titanium dioxide/silicon dioxide composite coating.
The results of the performance tests of the superhydrophilic passive self-cleaning glasses prepared in examples 1-3 are shown in table 1.
Table 1 super hydrophilic self cleaning glass performance test results:
contact angle/° 0.5 ° Transmittance (a) Hydrophilicity/day
Example 1 17.6 84.5 43
Example 2 13.9 86.9 48
Example 3 15.3 89.9 52
As can be seen from Table 1, the contact angles of the super-hydrophilic self-cleaning glass prepared in this example and water are all less than 20 degrees; the light transmittance is excellent and reaches over 84.5 percent; the super-hydrophilic self-cleaning paint has lasting super-hydrophilic performance under natural light, can keep 43 days of hydrophilicity, and can keep good self-cleaning effect under a natural state. Therefore, the super-hydrophilic passive self-cleaning coating and the super-hydrophilic passive self-cleaning glass have high-efficiency hydrophilicity, antifogging property and self-cleaning property, have lasting hydrophilicity under natural illumination, have unlimited development space, are suitable for self-cleaning of various glass and other surfaces, and are suitable for large-scale production.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The super-hydrophilic passive self-cleaning coating is characterized by comprising the following components in parts by weight: 19-32 parts of nano titanium dioxide, 12-23 parts of nano silicon dioxide, 4-10 parts of graphene oxide, 6-15 parts of a dispersing agent, 39-68 parts of deionized water, 4-10 parts of a film forming agent and 1-3 parts of an inhibitor.
2. The superhydrophilic passive self-cleaning coating of claim 1, further comprising 1.2-3.6 parts by weight of an ultraviolet absorber.
3. The superhydrophilic passive self-cleaning coating of claim 1, wherein; the nano titanium dioxide is hydrophilic titanium dioxide, the particle size is 20-40nm, and the purity is 99 wt%; the particle size of the nano silicon dioxide is 20nm, and the purity is 99 wt%; the lateral dimension of the graphene oxide is 5-15 μm.
4. The superhydrophilic passive self-cleaning coating of claim 1, wherein the dispersant comprises in parts by weight: 3-9 parts of acrylic acid, 2-10 parts of ethyl acetate, 2-5 parts of benzotriazole, 4-9 parts of polyacrylamide, 2-6 parts of hydroxyethylidene diphosphonic acid and 1-3 parts of Guel gum.
5. The superhydrophilic passive self-cleaning glass coating of claim 1, wherein the film-forming agent comprises, in percent by weight based on the total weight of the superhydrophilic passive self-cleaning glass coating: 5-15% of polyethylene glycol, 2-8% of silane coupling agent, 0.1-0.9% of hole sealing agent, 1-2% of film forming additive, 1-3% of oxidant, 0.8-1.5% of complexing agent and 0.5-0.9% of glycerol.
6. The superhydrophilic passive self-cleaning coating of claim 1, wherein the inhibitor comprises any one of methyl salicylate, benzophenone, benzotriazole, acetylacetone, diethanolamine, triethanolamine.
7. The superhydrophilic passive self-cleaning coating of claim 2, wherein the ultraviolet absorber comprises any one of UVT-150, octyl triazone, and ethylhexyl triazone.
8. The method for preparing the superhydrophilic passive self-cleaning coating according to any of claims 1-7, comprising the steps of:
s1: adding nano titanium dioxide, nano silicon dioxide, graphene oxide and a dispersing agent into absolute ethyl alcohol, and magnetically stirring for 60min to obtain a black solution A;
s2, mixing the film forming agent and the inhibitor, and magnetically stirring for 30min to obtain a solution B;
s3, slowly dripping the solution B into the solution A, and continuously stirring for 60min to obtain a black ink uniformly-dispersed sol C;
s4, heating the sol C at 50 ℃ and magnetically stirring for 60min to obtain the super-hydrophilic passive self-cleaning coating.
9. The method for preparing the superhydrophilic passive self-cleaning coating of claim 8,
in step S4, before heating the sol C at 50 ℃, the method further includes the step of adding an ultraviolet absorber into the sol C and stirring the mixture uniformly.
10. A preparation method of super-hydrophilic passive self-cleaning glass is characterized in that the super-hydrophilic passive self-cleaning coating of claim 8 is used, and comprises the following steps:
step 1, ultrasonically cleaning a glass substrate in isopropanol, absolute ethyl alcohol and 30% hydrogen peroxide for 10min in sequence, and drying at room temperature for later use;
step 2, coating the super-hydrophilic passive self-cleaning coating obtained in the claim 8 on the glass substrate treated in the step 1 by adopting a spraying method; then drying in a ventilation drying box;
and 3, coating the surface of the coated film obtained in the step 2 with the super-hydrophilic passive self-cleaning coating obtained in the claim 8 by adopting a spraying method, then putting the coated film into a ventilation drying box for drying, and naturally cooling to obtain the super-hydrophilic passive self-cleaning glass.
CN202011230578.8A 2020-12-21 2020-12-21 Super-hydrophilic passive self-cleaning coating and preparation method and application thereof Pending CN112409897A (en)

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