A Study On The Preparation Of Hollow Sb-doped SnO₂ And Its Thermal Insulation Properties In Silicone Acrylic Emulsion Coating

With the continuous recognition of sustainable development and an increasing awareness of environmental protection,people’s attention to building energy efficiency has gradually increased.Chinese government has also introduced various policies to reduce energy consumption,among which buildings consume a large amount of energy every year.In order to save energy,architectural glass must not only have good light transmittance,but also be able to effectively block infrared radiation.Sb-doped SnO₂（ATO）is an ideal transparent thermal insulation material.This study uses hydrothermal method to prepare Sb-doped SnO₂（ATO）and uses thermal insulation coatings for architectural glass to reduce energy consumption.The main research results of this thesis are as follows:（1）Preparation and thermal insulation properties of Sb-doped SnO₂（ATO）hollow microspheres the prepared hollow microspheres had near-sphere shape and consistent size.average particle diameter ranged from 2.5 to 5μm.It can be clearly seen that the XRD patterns of solid ATO and hollow ATO microspheres were well consistent with the standard pattern of tetragonal SnO₂.it can be found that,compared with the standard pattern of SnO₂,the（110）peak and（101）peak slightly right shifted to larger angles for both solid and hollow ATO microspheres.Such right shift is attributed to the lattice distortion resulting from the incorporation of Sb.ATO hollow microspheres introduction reduced the UV-Vis-NIR transmittance of the silicone acrylic emulsion coating,and enhanced the photo-thermal shielding performance of coating by higher absorption,slower thermal conduction and radiative cooling.With the ATO hollow microspheres dosage increasing,the substrate temperature rise rate decreased.The bottom facetemperatures of all glass samples increased with illumination time increasing.ATO coating application reduced the temperature rise rate,and the reduction ratio increased first（up to 1.6wt.%ATO dosage）and then decreased with increasing ATO microspheres dosage.As a result,the bottom face temperature of the sample with coating containing 1.6wt.%ATO showed the lowest temperature over time.（2）Preparation of Sb-doped SnO₂（ATO）submicron spheres and its perfor-ance comparison with commercial nano-ATOAntimony doped Tin Oxide（ATO）hollow submicron spheres were synthesized with a carbon ball template using the hydrothermal method,average particle diameter ranged from 200 to 500 nm,and compared with commercial nano-ATOs that differed in particle size.ATO hollow submicron spheres showed a thermal insulation performance comparable to that of nano-ATO,but their main respective thermal insulation mechanism was different.ATO hollow submicron spheres primarily relied on better particle dispersion,lower thermal conductivity(0.185W·m^-1·K^-1),higher specific heat capacity（0.651J/g·℃）and higher infrared emissivity（0.982）.Both nano-ATOs had better transmittance in the visible light range but relatively low transmittance in the ultraviolet and infrared range.Although the transmittance of submicron hollow ATO in the ultraviolet and infrared bands decreases slightly,it is more stable than commercial nano-ATO in the whole wavelength range.The results of this study indicate that ATO hollow submicron spheres are promising materials equivalent to nano-spheres that can be applied as a coating for energy conservation.