核壳型ATO/空心玻璃微珠复合材料的制备及其热反射性能

Preparation and properties of reflection infrared radiant for core/shell style ATO/hollow glass microspheres composites

采用水浆混合烧结法——空心玻璃微珠与SnO2、Sb2O3微纳粉水浆混合并在530℃烧结,制备核壳型结构ATO/空心玻璃微珠复合材料,作为彩色热反射材料。激光粒度分析仪测试水浆中氧化物的粒度分布;SEM、XRD分析表征复合材料的结构特点;傅立叶红外光谱仪测试该种材料制成的有机硅涂层近、中红外反射率。结果显示,水浆中粒度为0.6μm以下的氧化物,约占总量的93%;530℃烧结后,Sb2O3与SnO2合成ATO,包覆在空心玻璃微珠表面,形成厚度约600nm的壳层;在800～2100nm近红外波段,由复合材料制成的有机硅涂层反射率是50%～41%;在5～12μm红外波段,涂层的吸收率超过90%,预示该复合材料有较高的红外辐射率,可作为一种彩色凉颜料。

Core-shell structure ATO/hollow glass microspheres composites（HGMs） as heat reflectance materials were prepared by a novel mixing slurry-sintering method. Hollow glass microspheres were mixed with submicro SnO2 and Sb2O3 oxide powder slurry which were prepared by ball milling. After drying and sintering at 530℃, core-shell ATO/HGMs were obtained. The size distribution of the SnO2 and Sb2O3 oxide powder slurry after ball milling were tested by laser particle size analyzer;and the structures and morphology of the core-shell ATO/HGMs were characterized by SEM, XRD. A composite coating was prepared by mixing core-shell AT（）/ HGMs with silicone resin（SR）. Reflective properties of core-shell ATO/HGMs- SR composites coatings were investigated by Fourier transform infrared spectrometer in NIR and MIR. The results showed that the content of the oxide particles with size distribution less than 0.6μm is about 93%; the thickness of ATO shell on the HGMs was about 600nm, which were synthesized by the reaction of SnO2 and Sb203 at 530℃ The reflectance of the core-shell ATO/HGMs- SR composites coatings are 50%-41% in the infrared wavelength rang of 800- 2100nm, and the absorption are more than 90% in the infrared wavelength rang of 5-12μ, which indicated that core-shell ATO/HGMs can be applied as a good colour cool pigment.