Preparation And Properties Of Nano-Transparent Thermal Insulation And Radiation Protection Coatings

Visible light and infrared light are a large part of the solar spectrum,and the heat radiated by them accounts for 93%of the total solar radiant heat.Generally,glass is not selective for the transmission of sunlight,and it can not reduce the temperature change caused by heat radiation,and the temperature is lost due to the poor heat insulation.Therefore,it is important to study and prepare a transparent insulating material for glass which does not affect the transmission of visible light and absorption or reflection of near-infrared light.In thermal insulation coatings,nanoscale semiconductor materials have excellent absorption and reflection properties for infrared light,but they hinder the application of most nanomaterials in thermal barrier coatings due to higher cost.Nano-rhenium-doped tin dioxide?ATO?powder has good selective permeability to solar spectrum,high transmittance in visible light region,excellent barrier shielding performance in infrared light region.And the cost of Nano-ATO powder production is relatively low.It is an excellent filler for preparing Nano transparent heat-insulating radiation-proof coating.This paper is aimed at the preparation of Nano-ATO powder,the preparation of ATO aqueous dispersion slurry and the preparation of transparent heat-insulating radiation-proof coating.The best preparation method of ATO powder,aqueous dispersion slurry and transparent heat-insulating radiation-proof coating are obtained.The main research is as follows:1.Preparation and characterization of ATO Nano-powdersThe prepared ATO powders were characterized by thermogravimetric analysis,X-ray diffraction analysis and FTIR analysis with SnCl₄·5H₂O and SbCl₃ as the main raw materials.The amount of strontium doping,the calcination temperature of the precursor and the time were investigated for the ATO Nano-powder structure.Impact.The results show that the ATO precursor prepared by chemical coprecipitation with antimony doping degree of 7%is calcined at 800°C for 4 h,and then a rutile tetrahedral ATO powder with a crystal size of 25 nm is obtained.2.Preparation and Properties of Nano-ATO Waterborne SlurryThe self-made Nano-powder is mixed with deionized water to prepare an aqueous slurry system.The effects of ball milling process,ultrasonication,pH,dispersant type and dosage on the optical properties and stability of the aqueous slurry are mainly investigated.The results show that the aqueous slurry is dispersed by ball mill and ultrasonic,and the dispersing agent KH570 with 3%of the total system weight is added.When the pH value of the system is 9,the stable and uniformly dispersed Nano-ATO aqueous slurry is prepared.The average size of the Nano-ATO particles in the medium is 80 nm.3.Preparation and Properties of Nano-ATO Transparent Thermal Insulation and Radiation CoatingsThe water-based polyurethane SX-246 and Nano-ATO aqueous slurry were used as the main raw materials,and the heat-insulating and anti-radiation coating was prepared by blending method.The coating film was prepared by wire bar coater,and the coating film thickness and ATO slurry content were investigated.The impact of performance and thermal insulation properties.The results showed that the SX-246 waterborne polyurethane and the aqueous ATO slurry were prepared by the blending method at a volume ratio of 7:3 to obtain the Nano-ATO transparent heat-insulating anti-radiation coating,and the visible light of the 60?m glass coating film was formed by the wire bar coater.The over-rate is 72.35%,the infrared blocking rate is45.56%,and the heat insulation effect is better than the commercial automobile thermal insulation film.