| Energy conservation and environmental issues are the two major themesin today’s world, and the improvement of people’s living standard brings outhigher demands for these two fields. The glass used in construction andautomotive industry has a good transparency, while insufficient to preventinfrared radiation which eventually cause great energy loss and put anadditional load on the air-conditioning system. Nano Antimony Doped TinOxide (ATO) transparent insulation film glass can easily solve these problems.In the process of dispersing nano-particles, we take the direct dispersionmethod. The dispersed nano-powder is added into the waterborne coatings tomake the slurry, and then coating on the glass to form transparent insulationfilm materials. Waterborne coatings added in the powder significantlyeliminating the hazard to operators and environment, which is environmentalfriendly. Meanwhile, the preparation process and equipment is very simple, ithas a wide applied value and extensive market prospect. In this paper, wefocus on the study of the nano-ATO transparent insulation films, and thestructure of the paper is as follows:(1)For the shortcoming of conglomeration in the preparation of thenano-powder, we adopt the orthogonal experiment design method, andcombine the physical dispersing method and chemical dispersing method tostudy the dispersion stability of nano-ATO slurry. The results show that: First,the order of influencing factors on dispersion stability is ranked as species ofdispersing agent, PH value, ultrasonic dispersing time, content of dispersantand magnetic stirring time. Second, using the transmittance and subsidence asthe index, the best dispersion stability state of the nano-ATO slurry is observed under the conditions of that the stirring time is1h, content of dispersant is15%, the pH value is10, the type of dispersant is number4, and the ultrasonicdispersion time is30min. Third, we know from our calculation of XRDdiffraction spectrum diagram and observation of transmission electionmicrograph (TEM) that the particle size is about10nm.(2)We prepare the nano-ATO coatings through the direct dispersionmethod, and obtain that the stability of the coatings achieve the best when thewater polyurethane emulsion and nano-ATO slurry volume ratio is4:1. Fromthe results of the XRD and TEM, we find that the nano-particle size in thecoatings is about15nm after added into polyurethane emulsion, which wouldbe a little larger than the nano-particle in the slurry. In order to study the effectof experiment conditions to the spin coating, we take the orthogonalexperiment design method. The results show that the order of the affectingfactors could be arranged as follows: the first rotating speed, the second speedtime, the second rotating speed, the first speed time. And the best combinationof all the four factors for the experiment is: the first rotating at2000r/min, thesecond rotating at4000r/min, the first speed time is15s, and the secondspeed time is20s.(3)The major works in this paper is research on basic performance ofnano transparent insulation thin films, including mechanical properties, opticalproperties and heat insulation effect. The results get some useful conclusionswhich are as follows: when the volume ratio of water polyurethane emulsionand nano-ATO slurry is4:1, the curing temperature is120℃and curing time is2hour, and the coating layer is one or two, the thin film has good mechanicalproperty.Optical performance: the impact of curing conditions is relativelysmall, which could be ignored. With different ATO content and increases ofcoating layers, transmittance in visible region decreases, but increases in the infrared region. Study of the heat insulation effects basically accord with theconclusions from the infrared region. |
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