CN112708345A - Nano self-cleaning antibacterial coating and preparation process thereof - Google Patents
Nano self-cleaning antibacterial coating and preparation process thereof Download PDFInfo
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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
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/02—Polyamines
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1687—Use of special additives
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- C—CHEMISTRY; METALLURGY
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2231—Oxides; Hydroxides of metals of tin
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- C—CHEMISTRY; METALLURGY
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2258—Oxides; Hydroxides of metals of tungsten
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- C—CHEMISTRY; METALLURGY
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention discloses a nano self-cleaning antibacterial coating which comprises the following materials in parts by weight: compared with the prior art, the preparation method has the advantages that the operation is simple, and the cost is low; the coating prepared by the invention consists of a plurality of inorganic nano particles and a bionic antibacterial polymer, the nano concave-convex structure formed by silicon dioxide increases the surface tension, and the surface coated with the coating is also in a hydrophilic state under the conditions of no light and no reaction of titanium dioxide, thereby playing a role of easy cleaning; substances capable of changing the surface resistance value are introduced into the paint, so that static dust is prevented from adhering to the paint, and the dustproof effect is achieved; the bionic antibacterial polymer is introduced, so that the antibacterial effect can be achieved under the conditions of no light rays and no reaction of titanium dioxide; the formed coating has the capabilities of dust prevention, easy cleaning, bacteriostasis and the like.
Description
Technical Field
The invention relates to the field of self-cleaning coatings, in particular to a nano self-cleaning antibacterial coating and a preparation process thereof.
Background
Researchers have proposed a self-cleaning concept to address the problem of difficult cleaning. Self-cleaning surfaces can save a great deal of labor and can achieve the functions of dust prevention, easy cleaning, bacteriostasis and the like, and due to the advantages, self-cleaning coatings have been developed for many years. Two methods can be used to obtain such a surface: 1. a super-hydrophobic effect; 2. super hydrophilic photocatalysis. The two methods both utilize the action of water, the former takes away dirt through rolling liquid drops, the treatment is temporary and permanent, dust cannot be placed for adsorption, and the effect of taking away the dirt is not obvious; the photocatalytic sewage treatment device not only takes away the sewage through the water cloth which forms a sheet shape, but also destroys the adsorbed sewage through photocatalysis, has more attractive photocatalytic surface, can achieve the self-cleaning effect, and can achieve the antibacterial purpose through the photocatalysis principle. However, the titanium dioxide needs light to react, and the effect of taking away stains under the conditions of bacteriostasis and super-hydrophilicity is greatly reduced in the area with insufficient light only by the titanium dioxide. At present, materials for constructing the self-cleaning surface include zinc oxide, silicon oxide, titanium oxide, tungsten oxide, fluorosilane, fluororesin, PVDF, PTFE, and the like. However, there has been little research on coatings that are used on surfaces to effectively achieve surfaces that are easy to clean, even self-cleaning, and that have bacteriostatic and antibacterial capabilities.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide the nano self-cleaning antibacterial coating which has the advantages of easily available raw materials, simple process and capabilities of preventing dust, cleaning and inhibiting bacteria and the preparation process thereof.
In order to achieve the above object, the present invention adopts the following technical solutions:
the nano self-cleaning antibacterial coating is characterized by comprising the following materials in parts by weight: nano silicon dioxide, platinum hybridized nano titanium dioxide, nano tungsten trioxide, nano tin dioxide and bionic antibacterial macromolecules.
A preparation process of a nano self-cleaning antibacterial coating is characterized by comprising the following specific steps:
s1, dispersing the nano titanium dioxide and chloroplatinic acid in 40-60 times of deionized water, irradiating for 0.8-1.5 h under an LED lamp with the wavelength of 360-370 nm, washing with 5-10 times of deionized water after centrifugal separation, and drying to obtain platinum hybridized nano titanium dioxide;
s2, adding sodium tungstate dihydrate into a nitric acid solution, washing the precipitate obtained after reaction for 3-5 times by using deionized water of 4-6 times, then dispersing the obtained precipitate into deionized water of 4.5-6.5 times, adding hydrogen peroxide, and stirring for 40-56 hours to obtain a dispersion liquid; adding nano titanium dioxide and deionized water with the mass 45-55 times of that of the nano titanium dioxide into the dispersion liquid, dispersing and mixing by ultrasonic waves, adding nitric acid and tetraethyl siloxane, reacting for 20-28 h, and then performing centrifugal separation and drying to obtain the nano titanium dioxide and tungsten trioxide;
s3, weighing nano silicon dioxide, platinum hybridized nano titanium dioxide, tungsten trioxide, nano tin dioxide and a bionic antibacterial polymer, dispersing into a mixed solvent of ethanol, normal propyl alcohol, propylene glycol monomethyl ether and isopropyl alcohol by using an ultrasonic dispersion method, mixing to obtain a dispersion liquid, adding tetraethoxysilane and nitric acid, and continuously stirring until the mixture is uniformly mixed to obtain a coating solution.
In a further preferred embodiment of the present invention, in step S1, the diameter of the nano titanium dioxide is 5nm to 25nm, and the mass ratio of the chloroplatinic acid is 0.01% to 0.2% of the nano titanium dioxide.
As a further preferable aspect of the present invention, in step S2, the mass ratio of the sodium tungstate dihydrate to the nitric acid solution is 1:6 to 1: 8; the proportion of the precipitate to the hydrogen peroxide is 1:1.5-1: 2; the mass of the nano titanium dioxide is 2-10 times of that of the sediment; the mass of the nitric acid is 1-2% of that of the nano titanium dioxide; the tetraethyl siloxane accounts for 1-2% of the mass of the nano titanium dioxide.
As a further optimization of the invention, in step S3, the diameter of the nano-silica is 5nm to 25nm, and the mass of the platinum hybridized nano-titania is 2% to 10% of the nano-silica; the mass of the nano titanium dioxide and the tungsten trioxide is 2 to 10 percent of that of the nano silicon dioxide; the diameter of the nano tin dioxide is 5nm-7nm, and the mass of the nano tin dioxide is 2% -10% of that of the nano silicon dioxide.
In a further preferred embodiment of the present invention, in step S3, the antibacterial polymer is methyl quaternized polyethyleneimine, and the mass of the antibacterial polymer is 1% to 3% of nano silica.
In a further preferred embodiment of the present invention, in step S3, the mass ratio of ethanol in the mixed solvent is 35% to 40%, the mass ratio of n-propanol is 25% to 35%, the mass ratio of propylene glycol monomethyl ether is 25% to 35%, and the mass ratio of isopropanol is 1% to 5%; the mass ratio of the total mass of the nano silicon dioxide, the platinum hybridized nano titanium dioxide, the nano titanium dioxide/tungsten trioxide, the nano tin dioxide and the bionic antibacterial polymer in the dispersion liquid is 2-8%.
As a further preferred aspect of the present invention, in step S3, nitric acid is 0.5% to 1% by mass of the nano silica; the tetraethyl siloxane accounts for 1-2% of the total mass of the nano silicon dioxide.
As a further optimization of the invention, the coating is applied to each component of the air conditioner, and has the effects of dust prevention, bacteriostasis and self-cleaning.
The invention has the advantages that:
(1) the method is simple to operate, low in cost and suitable for large-scale actual production;
(2) the coating prepared by the invention consists of a plurality of inorganic nano particles and a bionic antibacterial polymer, the nano concave-convex structure formed by silicon dioxide increases the surface tension, and the surface coated with the coating is also in a hydrophilic state under the conditions of no light and no reaction of titanium dioxide, thereby playing a role of easy cleaning; in addition, substances capable of changing the surface resistance value are introduced into the paint, so that static dust is prevented from adhering to the paint, and a dustproof effect is achieved; meanwhile, the bionic antibacterial polymer is introduced, so that the antibacterial effect can be achieved under the conditions of no light rays and no reaction of titanium dioxide; the formed coating has the capabilities of dust prevention, easy cleaning, bacteriostasis and the like;
(3) the paint prepared by the invention can remove the dirt on the surface of the product under the factors of water, wind, light and the like, has certain antibacterial capability and brings convenience to the cleaning of the product.
Detailed Description
The following specific examples are intended to illustrate the invention.
The first embodiment is as follows: the nano self-cleaning antibacterial coating is characterized by comprising the following materials in parts by weight: nano silicon dioxide, platinum hybridized nano titanium dioxide, nano tungsten trioxide, nano tin dioxide and bionic antibacterial macromolecules.
A preparation process of a nano self-cleaning antibacterial coating is characterized by comprising the following specific steps:
s1, dispersing nano titanium dioxide with the diameter of 5nm and chloroplatinic acid in 40 times of deionized water, wherein the mass ratio of the chloroplatinic acid is 0.01% of that of the nano titanium dioxide, irradiating for 0.8h under an LED lamp with the wavelength of 360nm, washing with 5 times of deionized water after centrifugal separation, and drying to obtain platinum hybridized nano titanium dioxide;
s2, adding sodium tungstate dihydrate into a nitric acid solution, wherein the mass ratio of the sodium tungstate dihydrate to the nitric acid solution is 1:6, washing the obtained precipitate for 3 times by using deionized water of 4 times, dispersing the obtained precipitate into deionized water of 4.5 times, adding hydrogen peroxide, wherein the ratio of the precipitate to the hydrogen peroxide is 1:1.5, and stirring for 40 hours to obtain a dispersion liquid; adding nano titanium dioxide with the mass being 2 times of that of the precipitate and deionized water with the mass being 45 times of that of the nano titanium dioxide into the dispersion liquid, dispersing and mixing through ultrasonic waves, adding nitric acid and tetraethyl siloxane, reacting for 20 hours, wherein the nitric acid accounts for 1 percent of the mass of the nano titanium dioxide, and the tetraethyl siloxane accounts for 1 percent of the mass of the nano titanium dioxide, and then obtaining the nano titanium dioxide and tungsten trioxide through centrifugal separation and drying;
s3, weighing nano silicon dioxide with the diameter of 5nm, platinum hybridized nano titanium dioxide, tungsten trioxide, nano tin dioxide and a bionic antibacterial polymer, wherein the mass of the platinum hybridized nano titanium dioxide is 2 percent of that of the nano silicon dioxide; the mass of the nano titanium dioxide and the tungsten trioxide is 2 percent of nano silicon dioxide, the antibacterial polymer is methyl quaternized polyethyleneimine, the mass of the nano silicon dioxide is 1 percent, the diameter of the nano tin dioxide is 5nm, the mass of the nano tin dioxide is 2 percent of the nano silicon dioxide, the nano tin dioxide is dispersed into a mixed solvent of ethanol, n-propanol, propylene glycol monomethyl ether and isopropanol by an ultrasonic dispersion method and mixed to obtain a dispersion liquid, wherein the mass ratio of the ethanol in the mixed solvent is 35 percent, the mass ratio of the n-propanol in the mixed solvent is 25 percent, the mass ratio of the propylene glycol monomethyl ether in the mixed solvent is 25 percent, and the mass ratio of the isopropanol in the mixed solvent is; the mass ratio of the total mass of the nano silicon dioxide, the platinum hybridized nano titanium dioxide, the nano titanium dioxide/tungsten trioxide, the nano tin dioxide and the bionic antibacterial polymer in the dispersion liquid is 2%, and tetraethoxysilane and nitric acid are added, wherein the nitric acid is 0.5% of the mass of the nano silicon dioxide; and the tetraethyl siloxane accounts for 1 percent of the total mass of the nano silicon dioxide, and the mixture is continuously stirred until the mixture is uniformly mixed to obtain the coating solution.
The coating is applied to each component of the air conditioner, and has the effects of dust prevention, bacteriostasis and self-cleaning.
Example two: the nano self-cleaning antibacterial coating is characterized by comprising the following materials in parts by weight: nano silicon dioxide, platinum hybridized nano titanium dioxide, nano tungsten trioxide, nano tin dioxide and bionic antibacterial macromolecules.
A preparation process of a nano self-cleaning antibacterial coating is characterized by comprising the following specific steps:
s1, dispersing nano titanium dioxide with the diameter of 15nm and chloroplatinic acid in 50 times of deionized water, wherein the mass ratio of the chloroplatinic acid is 0.105% of that of the nano titanium dioxide, irradiating for 1 h under an LED lamp with the wavelength of 365nm, washing with 7.5 times of deionized water after centrifugal separation, and drying to obtain platinum hybridized nano titanium dioxide;
s2, adding sodium tungstate dihydrate into a nitric acid solution, wherein the mass ratio of the sodium tungstate dihydrate to the nitric acid solution is 1:7, washing the obtained precipitate for 4 times by using 5 times of deionized water after reaction, dispersing the obtained precipitate into 5 times of deionized water again, adding hydrogen peroxide, wherein the ratio of the precipitate to the hydrogen peroxide is 1:1.75, and stirring for 48 hours to obtain a dispersion liquid; adding nanometer titanium dioxide with the mass being 6 times of that of the precipitate and deionized water with the mass being 50 times of that of the nanometer titanium dioxide into the dispersion liquid, dispersing and mixing through ultrasonic waves, adding nitric acid and tetraethyl siloxane, reacting for 24 hours, wherein the nitric acid is 1.5 percent of the mass of the nanometer titanium dioxide, and the tetraethyl siloxane is 1.5 percent of the mass of the nanometer titanium dioxide, and then obtaining the nanometer titanium dioxide and tungsten trioxide through centrifugal separation and drying;
s3, weighing nano silicon dioxide with the diameter of 15nm, platinum hybridized nano titanium dioxide, tungsten trioxide, nano tin dioxide and a bionic antibacterial polymer, wherein the mass of the platinum hybridized nano titanium dioxide is 6 percent of that of the nano silicon dioxide; the mass of the nano titanium dioxide and the tungsten trioxide is 6 percent of nano silicon dioxide, the antibacterial polymer is methyl quaternized polyethyleneimine, the mass of the methyl quaternized polyethyleneimine is 2 percent of nano silicon dioxide, the diameter of the nano tin dioxide is 6nm, the mass of the nano tin dioxide is 6 percent of nano silicon dioxide, the nano tin dioxide is dispersed into a mixed solvent of ethanol, n-propanol, propylene glycol methyl ether and isopropanol by an ultrasonic dispersion method and mixed to obtain a dispersion liquid, wherein the mass ratio of the ethanol in the mixed solvent is 37.5 percent, the mass ratio of the n-propanol in the mixed solvent is 30 percent, the mass ratio of the propylene glycol methyl ether in the mixed solvent is 30 percent, and the mass ratio of the isopropanol in the; the mass ratio of the total mass of the nano silicon dioxide, the platinum hybridized nano titanium dioxide, the nano titanium dioxide/tungsten trioxide, the nano tin dioxide and the bionic antibacterial polymer in the dispersion liquid is 5 percent, and tetraethoxysilane and nitric acid are added, wherein the nitric acid is 0.75 percent of the mass of the nano silicon dioxide; tetraethyl siloxane accounts for 1.5 percent of the total mass of the nano silicon dioxide, and the tetraethyl siloxane is continuously stirred until the mixture is uniformly mixed to obtain the coating solution.
The coating is applied to each component of the air conditioner, and has the effects of dust prevention, bacteriostasis and self-cleaning.
Example three: the nano self-cleaning antibacterial coating is characterized by comprising the following materials in parts by weight: nano silicon dioxide, platinum hybridized nano titanium dioxide, nano tungsten trioxide, nano tin dioxide and bionic antibacterial macromolecules.
A preparation process of a nano self-cleaning antibacterial coating is characterized by comprising the following specific steps:
s1, dispersing nano titanium dioxide with the diameter of 25nm and chloroplatinic acid in 60 times of deionized water, wherein the mass ratio of the chloroplatinic acid is 0.2% of that of the nano titanium dioxide, irradiating for 1.5 h under an LED lamp with the wavelength of 370nm, washing with 10 times of deionized water after centrifugal separation, and drying to obtain platinum hybridized nano titanium dioxide;
s2, adding sodium tungstate dihydrate into a nitric acid solution, wherein the mass ratio of the sodium tungstate dihydrate to the nitric acid solution is 1:8, washing the obtained precipitate for 5 times by using deionized water 6 times, dispersing the obtained precipitate into deionized water 6.5 times, adding hydrogen peroxide, wherein the ratio of the precipitate to the hydrogen peroxide is 1:2, and stirring for 56 hours to obtain a dispersion liquid; adding nanometer titanium dioxide with the mass being 10 times of that of the precipitate and deionized water with the mass being 55 times of that of the nanometer titanium dioxide into the dispersion liquid, dispersing and mixing through ultrasonic waves, adding nitric acid and tetraethyl siloxane, reacting for 28 hours, and then obtaining the nanometer titanium dioxide and tungsten trioxide through centrifugal separation and drying;
s3, weighing nano silicon dioxide with the diameter of 25nm, platinum hybridized nano titanium dioxide, tungsten trioxide, nano tin dioxide and a bionic antibacterial polymer, wherein the mass of the platinum hybridized nano titanium dioxide is 10% of that of the nano silicon dioxide; the mass of the nano titanium dioxide and the tungsten trioxide is 10 percent of nano silicon dioxide, the antibacterial polymer is methyl quaternized polyethyleneimine, the mass of the methyl quaternized polyethyleneimine is 3 percent of the nano silicon dioxide, the diameter of the nano tin dioxide is 7nm, the mass of the nano tin dioxide is 10 percent of the nano silicon dioxide, the nano tin dioxide is dispersed into a mixed solvent of ethanol, n-propanol, propylene glycol monomethyl ether and isopropanol by an ultrasonic dispersion method and mixed to obtain a dispersion liquid, wherein the mass ratio of the ethanol in the mixed solvent is 40 percent, the mass ratio of the n-propanol in the mixed solvent is 35 percent, the mass ratio of the propylene glycol monomethyl ether in the mixed solvent is 35 percent, and the mass ratio of the isopropanol; the mass ratio of the total mass of the nano silicon dioxide, the platinum hybridized nano titanium dioxide, the nano titanium dioxide/tungsten trioxide, the nano tin dioxide and the bionic antibacterial polymer in the dispersion liquid is 8%, and tetraethoxysilane and nitric acid are added, wherein the nitric acid accounts for 1% of the mass of the nano silicon dioxide; and the tetraethyl siloxane accounts for 2 percent of the total mass of the nano silicon dioxide, and the mixture is continuously stirred until the mixture is uniformly mixed to obtain the coating solution.
The coating is applied to each component of the air conditioner, and has the effects of dust prevention, bacteriostasis and self-cleaning.
The invention has the advantages that:
(1) the method is simple to operate, low in cost and suitable for large-scale actual production;
(2) the coating prepared by the invention consists of a plurality of inorganic nano particles and a bionic antibacterial polymer, the nano concave-convex structure formed by silicon dioxide increases the surface tension, and the surface coated with the coating is also in a hydrophilic state under the conditions of no light and no reaction of titanium dioxide, thereby playing a role of easy cleaning; in addition, substances capable of changing the surface resistance value are introduced into the paint, so that static dust is prevented from adhering to the paint, and a dustproof effect is achieved; meanwhile, the bionic antibacterial polymer is introduced, so that the antibacterial effect can be achieved under the conditions of no light rays and no reaction of titanium dioxide; the formed coating has the capabilities of dust prevention, easy cleaning, bacteriostasis and the like;
(3) the paint prepared by the invention can remove the dirt on the surface of the product under the factors of water, wind, light and the like, has certain antibacterial capability and brings convenience to the cleaning of the product.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (9)
1. The nano self-cleaning antibacterial coating is characterized by comprising the following materials in parts by weight: nano silicon dioxide, platinum hybridized nano titanium dioxide, nano tungsten trioxide, nano tin dioxide and bionic antibacterial macromolecules.
2. The preparation process for producing the nano self-cleaning bacteriostatic coating as claimed in claim 1 is characterized by comprising the following specific steps of:
s1, dispersing the nano titanium dioxide and chloroplatinic acid in 40-60 times of deionized water, irradiating for 0.8-1.5 h under an LED lamp with the wavelength of 360-370 nm, washing with 5-10 times of deionized water after centrifugal separation, and drying to obtain platinum hybridized nano titanium dioxide;
s2, adding sodium tungstate dihydrate into a nitric acid solution, washing the precipitate obtained after reaction for 3-5 times by using deionized water of 4-6 times, then dispersing the obtained precipitate into deionized water of 4.5-6.5 times, adding hydrogen peroxide, and stirring for 40-56 hours to obtain a dispersion liquid; adding nano titanium dioxide and deionized water with the mass 45-55 times of that of the nano titanium dioxide into the dispersion liquid, dispersing and mixing by ultrasonic waves, adding nitric acid and tetraethyl siloxane, reacting for 20-28 h, and then performing centrifugal separation and drying to obtain the nano titanium dioxide and tungsten trioxide;
s3, weighing nano silicon dioxide, platinum hybridized nano titanium dioxide, tungsten trioxide, nano tin dioxide and a bionic antibacterial polymer, dispersing into a mixed solvent of ethanol, normal propyl alcohol, propylene glycol monomethyl ether and isopropyl alcohol by using an ultrasonic dispersion method, mixing to obtain a dispersion liquid, adding tetraethoxysilane and nitric acid, and continuously stirring until the mixture is uniformly mixed to obtain a coating solution.
3. The preparation process of the nano self-cleaning bacteriostatic coating according to claim 2, characterized in that in step S1, the diameter of the nano titanium dioxide is 5nm-25nm, and the mass proportion of the chloroplatinic acid is 0.01% -0.2% of the nano titanium dioxide.
4. The preparation process of the nano self-cleaning bacteriostatic coating according to claim 2, characterized in that in the step S2, the mass ratio of the sodium tungstate dihydrate to the nitric acid solution is 1:6-1: 8; the proportion of the precipitate to the hydrogen peroxide is 1:1.5-1: 2; the mass of the nano titanium dioxide is 2-10 times of that of the sediment; the mass of the nitric acid is 1-2% of that of the nano titanium dioxide; the tetraethyl siloxane accounts for 1-2% of the mass of the nano titanium dioxide.
5. The preparation process of the nano self-cleaning bacteriostatic coating according to claim 2, characterized in that in step S3, the diameter of nano silica is 5nm-25nm, and the mass of platinum hybridized nano titanium dioxide is 2% -10% of nano silica; the mass of the nano titanium dioxide and the tungsten trioxide is 2 to 10 percent of that of the nano silicon dioxide; the diameter of the nano tin dioxide is 5nm-7nm, and the mass of the nano tin dioxide is 2% -10% of that of the nano silicon dioxide.
6. The preparation process of the nano self-cleaning bacteriostatic coating according to claim 2, characterized in that in step S3, the antibacterial polymer is methyl quaternized polyethyleneimine, the mass of which is 1-3% of nano silicon dioxide.
7. The preparation process of the nano self-cleaning bacteriostatic coating according to claim 2, characterized in that in step S3, the mass ratio of ethanol in the mixed solvent is 35-40%, the mass ratio of n-propanol is 25-35%, the mass ratio of propylene glycol monomethyl ether is 25-35%, and the mass ratio of isopropanol is 1-5%; the mass ratio of the total mass of the nano silicon dioxide, the platinum hybridized nano titanium dioxide, the nano titanium dioxide/tungsten trioxide, the nano tin dioxide and the bionic antibacterial polymer in the dispersion liquid is 2-8%.
8. The preparation process of the nano self-cleaning bacteriostatic coating according to claim 2, characterized in that in the step S3, nitric acid accounts for 0.5-1% of the mass of nano silicon dioxide; the tetraethyl siloxane accounts for 1-2% of the total mass of the nano silicon dioxide.
9. The nano self-cleaning bacteriostatic coating according to any one of claims 1 to 8, wherein the coating is applied to each component of an air conditioner to achieve the effects of dust prevention, bacteriostasis and self-cleaning.
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