以烷氧基硅烷溶胶-凝胶技术制备纳米ATO透明隔热涂层

Preparation of ATO transparent and heat-Insulating coat based on alkyloxysilane by sol-gel technology

将硅氧烷水解液与纳米ATO(锑掺杂氧化锡)的乙醇浆液掺混,形成复合溶胶,然后浸涂于玻璃基底上并加热固化,以制备有机硅树脂基ATO透明隔热涂层。用SEM观察了涂层表面结构,考察了溶胶中ATO固含量对涂层透明隔热性能的影响,测试了涂层力学性能。发现:ATO以纳米颗粒形式均匀分布在玻璃表面;当溶胶中ATO固含量为10%时,涂层在可见光区透过率达80%,红外阻隔率达65%;涂层实际隔热效果明显(涂层玻璃覆盖的泡沫塑料箱内温度较无涂层玻璃覆盖箱内温度低13℃);相比早期的纳米ATO/水性聚氨酯涂层,本研究所得涂层硬度达5H,附着力达0级,耐水、耐候性能优良。研究为推动透明隔热纳米涂料的实际应用有帮助。

Transparent and heat insulating coats based on antimony doped tin oxide （ATO） nanoparticles were pre- pared by mixing ATO nanoparticles with alkyloxysilicane alcohol sol and then coating and drying them on glass substrates. The surface structure was observed by SEM. The effect of the solid content of ATO on the response to solar light of the coat was investigated. The mechanical properties were tested too. The results showed that ATO were homogeneously and firmly conglutinated on the glass substrate at nanoscale. When the content of ATO in composite sol was 10 wt % ,the visible light transmittance of the coat was up to 80% and the infrared radiation insulation was over 65%. The coats＇ heat-insu- lating properties were measured by long time tracking the temperature changes in polystyrene foam boxes covered by ATO coated glass plate. The temperatures in ATO glass covered box were always lower than those in general glass covered box （（13 ℃ ）. Compared with traditional polyurethane matrix, silicon resin remarkably improved the properties of the coat such as hardness,resistance to wear and water immersing. This study would be helpful in moving the practical application of ATO transparent and heat insulating coats.