Research On Preparation And Characterization Of Heat Insulation And Self-cleaning Fluorocarbon Transparent Coating

Transparent and heat-insulation coating not only has the heat-insulation andtransparency, but also has corrosion resistance, aging resistance, excellent mechanicalproperties, etc. Therefore, it is widely used in architectural glass and automotive glass.However, these products suffer from some limitations, such as not simultaneousacquisition of heat insulation and self-cleaning function, while maintaining hightransmittance in the visible region, unsuitability in large scale production or tooexpensive and so on. Based on the choice of materials and the process methods ofimprovement and innovation, we have improved the performance. In this paper, atransparent thermal insulation and self-cleaning coating was prepared from afluorocarbon emulsion doped with antimony tin oxide （ATO） and anabase TiO₂nanoparticles. The results from the various performance test show that the coatingpossesses excellent thermal insulation property as well as good self-cleaning propertywhile still keep highly transparent in the visible range, which make promising asenergy saving and environmental protection materials. The experimental results are asfollows:1. By the surface modification of ATO nanoparticles and study on the dispersionperformance, the results shown that silane coupling agent KH-570was the mostappropriate, the optimum dosage was1.50.1wt.%, the most appropriate dispersantwas731A：3275=1:1mixed dispersants and the optimum dosage was0.80.1wt.%,the most appropriate dispersion process was high speed shearing dispersion40min+grinding dispersion100min+ultrasonic dispersion20min.2. Different emulsion and adding different additives affects appearance of film,smoothness, transparent etc. More appropriate emulsion of the blend emulsion offluorocarbon emulsion and styrene-acrylic emulsion （or silicone-acrylic emulsion）,the most appropriate leveling agent was polyurethane2020and the optimum dosagewas0.60.1wt.%, the most appropriate defoaming agent was organic silicondefoaming agent W-082and the optimum dosage was0.40.1wt.%.3. The thermal insulation and self-cleaning properties of the coating film wereoptimized by tuning the amount of ATO and anabase TiO₂nanoparticles in theemulsion.Adding different doses of ATO affect transparent and heat-insulation of thecoating film. With the increase of ATO content, the visible light transmittancedecreases and the heat-insulation effect is better. TiO₂is a functional material which has self-cleaning properties. By adding1.5wt.%ATO and0.1wt.%TiO₂to thefluorocarbon emulsion, the coating possesses good comprehensive properties.The above experimental results show that the coating possesses goodcomprehensive properties by adding1.5wt.%ATO and0.1wt.%TiO₂to the the blendemulsion. The preparated coating has good adhesion to glass, good water resistance,acid resistance and alkali resistance. After500h of artificial weathering test, thecoating film had no change, so the coating have excellent comprehensive performance,can be used for coating the surface of the glass, but its storage stability as well as theconstruction process are still to be improved.