With the low-carbon economy becoming a global hotspot, energy-saving materials are increasingly favored by people. In building energy conservation, the light transmission and heat insulation of glass is a very critical issue. In buildings with large areas of exterior windows and transparent ceilings, car windows and other occasions, the thermal radiation of sunlight will lead to an increase in the energy consumption of air conditioners. , resulting in a great waste of energy. Therefore, the development of high-efficiency nano thermal insulation and energy-saving coatings is imminent, and nano-transparent thermal insulation coatings have become the new favorite of energy-saving and environmentally friendly coatings.

      The key to transparent thermal insulation coatings is to find nano-semiconductor materials with selective permeability to sunlight. Among them, nano ATO tin antimony oxide has good visible light transmission and infrared blocking properties, and is an ideal thermal insulation material. It can be used in glass (building curtain wall glass, car window glass light occasions), coating, paint, polymer film, electronics and other fields. While ensuring sufficient visible light transmission, the solar heat radiation is blocked to the greatest extent. The preparation process is as follows: the inorganic nano-semiconductor material and the organic macromolecular polymer are compounded by an appropriate method to obtain a transparent heat-insulating paint with spectral selectivity, and then the paint is coated on the glass to form a film. The method does not require complicated equipment, is convenient for construction, and can adjust the types and proportions of components in the coating according to actual needs, so as to obtain products suitable for different environments.

example 1:
Preparation of Nano ATO Slurry
      Take a certain amount of ATO nano powder (according to multiple sets of test data, the addition amount of nano ATO is 1-10%) in a conical flask, add a certain amount of deionized water, and press a certain amount under magnetic stirring conditions. Compared with adding silane coupling agent KH-570 and dispersing agent successively (compare the dispersion effect of chelating dispersing agent, ionic dispersing agent and block dispersing agent, it is found that using chelating dispersing agent to disperse nano-ATO slurry can meet the Under the premise of transparency, a coating with better heat insulation performance can be obtained) to make it evenly mixed, adjust the pH value to 7-9, and then use an electronic constant speed stirrer for high-speed shearing and ultrasonic disperser for ultrasonic treatment until the set time. Remove the slurry for use.

Preparation of Transparent Thermal Insulation Coatings
      Under the condition of magnetic stirring, the nano-ATO aqueous slurry was added to the aqueous polyurethane, and a certain amount of wetting agent, dispersing agent, thickening agent, film-forming aid, and leveling agent were added in a certain proportion in turn, and the pH value was adjusted. 7-9, the combination of high-speed shear dispersion and ultrasonic dispersion (the results show that high-speed shear dispersion for 2h and ultrasonic dispersion for 20min can obtain a well-dispersed slurry, and the prepared coating has excellent thermal insulation effect), and the dispersion is obtained. ATO water-based polyurethane transparent insulating glass coating with good performance. If a lot of air bubbles appear during the stirring process, add antifoaming agent dropwise to defoaming.

      The composite coating made of nano-tin oxide antimony ATO water-based slurry and water-based polyurethane resin PU not only has good film-forming properties, but also has an infrared blocking rate of 70-75% while maintaining a visible light transmittance of 83%. Can be maintained at about 7 ℃, in line with the coating has good thermal insulation properties. The study found that when the ATO content was 8%, the thermal insulation and hardness, abrasion resistance, water resistance and adhesion of the coating were the best.

Example 2:
Preparation of Nano ATO Slurry and Formulation of Transparent Thermal Insulation Coatings:
      A certain amount of nano-ATO powder and silane coupling agent accounting for 1.5% of ATO were weighed, added to a quantitative amount of 95% ethanol, dispersed by ultrasonic for 40 minutes, transferred to a bottle with a reflux device, stirred for 4 hours, and dried in vacuum at 80 °C. Add deionized water, dispersant, wetting agent, and thickener to the sand mill stirring disperser, stir evenly, add the treated nano-ATO, disperse sand at high speed for 6-8 hours, adjust the pH to 7.5-8.0, and prepare the Nano ATO paste. Stir and mix the film-forming material and the nano-ATO slurry, then add defoamer, leveling agent, bactericide, PH regulator, stir and mix evenly, and prepare a transparent thermal insulation coating.
      The silicone nano-ATO heat-insulating transparent coating prepared by adding nano-ATO with silicone as film-forming agent and ethanol as solvent has good adhesion to glass, the temperature difference can reach 12-15 ℃, and the visible light transmittance can reach 80 % or more, it has good heat insulation effect and sufficient transparency in the visible light region, and the energy saving effect is obvious.

      The nano-ATO transparent thermal insulation coating prepared by using the nano-tin oxide antimony ATO water-based slurry and the silicone emulsion modified acrylic resin as the film-forming material, the transmittance of the coating film to visible light reaches 81.5%-85%, and the transmittance to near-infrared light reaches 81.5%-85%. The barrier rate reaches 62.5%-65%, and the coating film has excellent stain resistance, weather resistance and environmental protection.

      Using two-component water-based polyurethane as film-forming agent, adding nano-antimony tin oxide (ATO), and using distilled water as solvent, nano-ATO two-component water-based polyurethane heat-insulating transparent coating was prepared. The prepared coatings were coated on glass, and the transmittance in the visible and infrared regions as well as the effects on thermal insulation properties were tested, and the effects of different curing processes on the mechanical properties of the coatings were compared. The results show that the prepared nano-ATO transparent thermal insulation coating has good adhesion to glass, the temperature difference can reach 7.3 ℃, the visible light transmittance can reach 85%, it has good thermal insulation effect and sufficient transparency in the visible light region, and the energy saving effect is remarkable. .
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