Indoor air sterilization window glass coating based on nano thermoelectric material as well as preparation method and application of indoor air sterilization window glass coating

Abstract

The invention belongs to the technical field of functional coatings, and discloses an indoor air sterilization window glass coating based on a nano thermoelectric material as well as a preparation method and application of the indoor air sterilization window glass coating. The preparation method comprises the following steps: uniformly dispersing a nano thermoelectric material in an ethanol-water mixed solvent, synergistically adding an adhesion promoter and a wetting agent, and stirring to form a stable dispersion liquid; the dispersion liquid is uniformly loaded on the surface of window glass through spraying or spin coating and the like, and a compact functional coating is formed after low-temperature gradient drying. The surface of the nanometer thermoelectric material is driven to generate active free radicals by innovatively utilizing indoor and outdoor natural temperature difference, microorganisms in air are efficiently killed, extra energy input or chemical additives are not needed, and the method is suitable for green air purification in residences, hospitals, schools and other scenes; and a new strategy is provided for solving the problems of high energy consumption, complex operation, secondary pollution and the like of the traditional sterilization technology.

Description

Technical Field

[0001] The present invention belongs to the technical field of functional coatings, and particularly relates to an indoor air sterilizing window glass coating based on nano-thermoelectric materials, a preparation method thereof, and an application thereof. Background Art

[0002] With the improvement of the public's health awareness and the continuous improvement of medical and health standards, indoor air sterilization technology has become an important research direction in the field of building environment. Especially in enclosed places such as families, medical institutions, and schools, how to efficiently and safely achieve air microorganism disinfection is a technical problem that needs to be solved urgently. Traditional air sterilization methods such as ultraviolet radiation and chemical spraying generally have limitations such as high energy consumption, complex operation, chemical residues, or potential hazards to the human body. In addition, existing functional coating technologies mostly rely on mechanisms such as photocatalysis or ion release, and their sterilization efficiency is easily restricted by environmental conditions (such as light intensity, humidity), etc. Summary of the Invention

[0003] Based on the above technical background, in view of the demand for indoor air sterilization, the present invention innovatively proposes a preparation method for a window glass coating based on nano-thermoelectric materials. This technology cleverly utilizes the indoor-outdoor temperature difference phenomenon commonly existing in window glass, and through the temperature difference, active free radicals are generated on the surface of the nano-thermoelectric materials, thereby realizing the function of efficient and pollution-free air sterilization. Compared with traditional technologies, the present invention abandons the need for external energy supply and avoids the introduction of chemical reagents, simplifies the preparation process, and significantly improves the environmental adaptability at the same time. The coating material system ensures the uniformity and long-term stability of the coating on the glass substrate by optimizing the synergistic effect of the adhesion promoter and the wetting agent, further expanding the practical value of this technology in various application scenarios. The implementation of the present invention provides a green, energy-saving, economical and efficient innovative solution for the field of indoor air purification.

[0004] A glass product containing a thermoelectric material coating proposed by the present invention, wherein the glass product is composed of a nano-thermoelectric material coating with a thermoelectric effect of temperature difference and capable of releasing oxygen anions and glass with general application ability; the thermoelectric material coating can cause a potential difference and surface charges under the action of a temperature difference, thereby reducing oxygen in the air to oxygen anions.

[0005] A preparation method for an indoor air sterilizing window glass coating based on nano-thermoelectric materials, comprising the following steps:

[0006] (1) Dispersing nano-thermoelectric materials, an adhesion promoter, and a wetting agent in a solvent to form a functional coating;

[0007] (2) Coating the functional coating obtained in step (1) on the surface of the glass substrate by direct deposition, spray deposition, dip coating, spin coating or screen printing processes to form a uniform coating;

[0008] (3) Performing gradient drying treatment on the coated glass substrate, specifically: vacuum drying at 80 - 120 °C for more than 60 minutes, and finally forming a dense thermoelectric material coating with a thickness of 100 - 900 nm.

[0009] In step (1), the nano-thermoelectric material is selected from at least one of bismuth telluride Bi2Te3, antimony telluride Sb2Te3, tin selenide SnSe, tin sulfide SnS, silver selenide Ag2Se, and silver sulfide Ag2S. The particle size of the nano-thermoelectric material is 50 nm - 1 μm, accounting for 5 wt% - 15 wt% of the total mass of the functional coating;

[0010] In step (1), the adhesion promoter is selected from at least one of DS-2063, BYK-4512, and EL-9041, and the addition amount is 0.5 wt% - 5 wt% of the total mass of the functional coating;

[0011] In step (1), the wetting agent is selected from at least one of OE-35, TD-6070, and VOK-125, and the addition amount is 0.2 wt% - 3 wt% of the total mass of the functional coating;

[0012] The solvent is a mixed solution of ethanol and water, wherein the volume ratio of ethanol is 50% - 90%;

[0013] In step (2), the glass substrate is any one of ordinary soda-lime glass, tempered glass or Low-E glass, and is treated by plasma or ultraviolet ozone before coating to improve the surface activity.

[0014] The indoor air sterilizing window glass coating based on nano-thermoelectric materials obtained by the above method has a surface roughness less than 50 nm and a visible light transmittance greater than 85%.

[0015] When a temperature difference is formed on both sides of the coating, the sterilization rate of the coating against Escherichia coli, Staphylococcus aureus or Aspergillus niger is greater than 50% within 24 hours. The coating can be reused, and the sterilization performance recovery rate is greater than 90% after being wiped with ethanol or rinsed with deionized water.

[0016] The application scenarios of the indoor air sterilizing window glass based on nano-thermoelectric materials obtained by the present invention include enclosed spaces in residences, hospitals, schools, laboratories and public transportation facilities. By driving the thermoelectric material coating to generate active free radicals through the indoor-outdoor temperature difference, continuous air purification without chemical residues is achieved.

[0017] The beneficial technical effects of the present invention are:

[0018] The glass product provided by this application can load thermoelectric materials on the surface of glass products in various ways; the thermoelectric coating material has a thermoelectric effect and does not require electricity, light or stress to trigger. Under the action of a temperature difference, it can cause a potential difference and surface charge, thereby reducing oxygen in the air to oxygen anions, achieving the effect of sterilization and disinfection. Its advantages lie in its wide application scenarios, and it can be self-driven for sterilization and work continuously under the temperature difference between the inside and outside of buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content and drawings of the embodiments of the present invention.

[0020] Figure 1 It is a schematic structural diagram of the glass product provided by the present invention. In the figure: a - thermoelectric material coating; b - glass;

[0021] Figure 2 It is a schematic diagram of the experimental model of the embodiment. In the figure: 1 - temperature controller 1; 2 - chamber 1; 3 - glass with Bi2Te3 nanomaterial coated on one side; 4 - temperature controller 2; 5 - chamber 2;

[0022] Figure 3 It is the XRD pattern of the Bi2Te3 nanomaterial used in the embodiment;

[0023] Figure 4 It is the SEM pattern of the Bi2Te3 nanomaterial used in the embodiment;

[0024] Figure 5 It is the change of the survival rate of Escherichia coli with time when the temperature controller 1 (1) maintains the temperature at 0°C, 10°C, 20°C, 30°C, and 40°C respectively. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will further describe in detail the technical solutions of the embodiments of the present invention with reference to the drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0026] Embodiment 1:

[0027] (1) First, Bi2Te3 nanomaterials were synthesized by the hydrothermal method. Specifically, 0.2 g of PVP was dissolved in 18 mL of ethylene glycol to form a transparent solution, and then 0.233 g of Bi2O3 powder and 0.240 g of TeO2 powder were added. The prepared solution was mixed with 2 mL of NaOH solution (5 mol / L) and stirred for 30 min, and then sealed in a 100 mL Teflon-lined steel autoclave. The autoclave was heated to 210 °C and naturally cooled to room temperature in air after 24 hours. The synthesized product was washed with distilled water and absolute ethanol, and the synthesized powder material was collected by high-speed centrifugation. Finally, it was vacuum dried at 50 °C for 12 hours and then ground to obtain Bi2Te3 powder.

[0028] The materials were characterized by XRD and SEM, as Figure 3 、 Figure 4 shown. The obtained powder was a pure-phase Bi2Te3 material, and its microscopic morphology was a flaky structure with a size less than 1 μm.

[0029] (2) 5 g of Bi2Te3 powder was dissolved in 100 mL of an ethanol-water solution (ethanol volume ratio was 70%), and it was ultrasonically treated for 5 h to form a suspension. Then, 25 mg of DS-2063 and 25 mg of VOK-125 were added to increase the adhesion ability of the coating. The suspension was uniformly coated on a 2 cm * 2 cm square glass by spraying.

[0030] (3) First, it was dried at 80 °C for 30 min, and then dried in a vacuum oven at 100 °C for 1 h to obtain a glass (3) with a single-sided coating of Bi2Te3 nanomaterials. Finally, the side with the coating was facing the second cabin (5).

[0031] A glass (3) with a single-sided coating of Bi2Te3 nanomaterials, as Figure 1 shown. The glass product was composed of a thermoelectric material (a) and a common glass (b). The thermoelectric material (a) would cause a potential difference and surface charge under the action of a temperature difference, thereby reducing oxygen to generate oxygen anions, playing a role in sterilization and disinfection.

[0032] An example of using the above thermoelectric material-coated glass product to kill Escherichia coli was provided in the embodiment of the present invention. Figure 2 It was a schematic diagram of the experimental model for the embodiment. In the figure: 1. Temperature controller 1; 2. First cabin; 3. Glass with a single-sided coating of Bi2Te3 nanomaterials; 4. Temperature controller 2; 5. Second cabin.

[0033] Sterilization performance test:

[0034] E. coli K12 was cultured in LB medium in advance. E. coli K12 cells were added to the LB medium and cultured at 37 °C for 20 h. The E. coli was diluted with 0.85% sodium chloride solution to an initial concentration of 1×10 6 CFU / mL.

[0035] The temperature controller two (4) in the control cabin two (5) was maintained at 20 °C to simulate the home temperature, and the temperature controller one (1) was maintained at 0 °C, 10 °C, 20 °C, 30 °C, and 40 °C respectively to simulate the outdoor temperature. After the temperature was stabilized, 10 mL of the E. coli dilution was dropped on one side of the glass (3) coated with Bi2Te3 nanomaterial. 100 μL of samples were taken every 3 h, and the number of E. coli colonies was calculated on the counting plate. A total of 8 samples were taken. As Figure 5 shown, when the temperature controller one (1) was maintained at 0 °C, 10 °C, 20 °C, 30 °C, and 40 °C respectively, the survival rate of E. coli changed with time.

[0036] The results showed that with the prolongation of time, the survival rate of E. coli gradually decreased, and after 24 h, the survival rate of E. coli was generally about 60%; the greater the temperature difference between the two cabins, the lower the survival rate of E. coli. When the temperature difference reached 20 K, the survival rate of E. coli was less than 50%; when there was no temperature difference between the two cabins, the survival rate of E. coli was basically stable.

[0037] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A preparation method of an indoor air sterilization window glass coating based on nano-thermoelectric materials, characterized in that, It includes the following steps: (1) Dispersing the nano-thermoelectric material, adhesion promoter and wetting agent in a solvent to form a functional coating; (2) Coating the functional coating obtained in step (1) on the surface of the glass substrate by direct deposition, spray deposition, dip coating, spin coating or screen printing process to form a uniform coating; (3) Performing gradient drying treatment on the coated glass substrate, specifically: vacuum drying at 80-120 °C for more than 60 minutes to finally form a dense thermoelectric material coating.

2. The preparation method according to claim 1, wherein In step (1), the nano-thermoelectric material is selected from at least one of bismuth telluride Bi2Te3, antimony telluride Sb2Te3, tin selenide SnSe, tin sulfide SnS, silver selenide Ag2Se, and silver sulfide Ag2S. The particle size of the nano-thermoelectric material is 50 nm to 1 μm, accounting for 5 wt% to 15 wt% of the total mass of the functional coating.

3. The preparation method according to claim 1, characterized in that, In step (1), the adhesion promoter is selected from at least one of DS-2063, BYK-4512, and EL-9041, and the addition amount is 0.5 wt% to 5 wt% of the total mass of the functional coating.

4. The preparation method according to claim 1, characterized in that, In step (1), the wetting agent is selected from at least one of OE-35, TD-6070, and VOK-125, and the addition amount is 0.2 wt% to 3 wt% of the total mass of the functional coating.

5. The preparation method according to claim 1, characterized in that, In step (1), the solvent is a mixed solution of ethanol and water, where the volume ratio of ethanol is 50% to 90%.

6. The preparation method according to claim 1, characterized in that, In step (2), the glass substrate is any one of ordinary soda-lime glass, tempered glass or Low-E glass, and is treated by plasma or ultraviolet ozone before coating to improve the surface activity.

7. An indoor air sterilizing window glass coating based on nano-thermoelectric materials, characterized in that, The thickness is 100-900 nm, the surface roughness is less than 50 nm, and the visible light transmittance is greater than 85%.

8. Application of the indoor air sterilization window glass coating based on nano-thermoelectric material described in claim 7 for sterilization in the air.

9. The application according to claim 8, wherein When a temperature difference is formed on both sides of the indoor air sterilization window glass coating based on nano-thermoelectric material, the coating can achieve sterilization.

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