摘要
环保型高近红外反射颜料可以有效缓解城市"热岛效应"和能源危机,对推动绿色建筑节能产业发展具有重要的意义。离子掺杂是实现高近红外反射颜料呈色多样性的有效手段,本研究采用溶胶-凝胶法制备了一系列铜离子和稀土铽离子共掺杂的高近红外反射Ba_(1–x)Cu_xZr_(1–y)Tb_yO_3(x=0.15,0.25,0.35;y=0,0.15)无机颜料。利用X射线衍射仪(XRD)、紫外/可见/近红外分光光度计、CIE 1976 L~*a~*b~*色度坐标等对所合成的颜料粉体的晶体结构、反射性能、颜色性能等进行表征。结果表明,在煅烧温度为1100℃时,所合成的样品均为立方钙钛矿结构;Cu~(2+)、Tb~(3+)共掺杂进入BaZrO_3晶格中,随着掺杂量的增加,颜料样品颜色由白色逐渐变为灰色再变为黄色。而且所得颜料在780~2500 nm波长范围内具有较高的近红外太阳光反射率,其平均反射率(R~*)可达到80%左右。因此,这种Ba_(1–x)Cu_xZr_(1–y)Tb_yO_3"冷"颜料粉体在建筑涂料等方面具有广阔的应用前景。
The urban island effect and energy crisis can be relieved usefully by environmentally benign and high near-infrared reflective pigments,which is of great significance to develop of green energy-saving industry.Ions doping is an effective way to achieve the color diversity of high near infrared reflective pigments.In this work,a series of high near-infrared reflection Ba_(1–x)Cu_xZr_(1–y)Tb_yO_3(x=0.15,0.25,0.35;y=0,0.15)inorganic pigment co-doped with Cu~(2+)and rare earth Tb~(3+)was prepared by a Sol-Gel process.Its phase structure,ultraviolet/visible/near-infrared reflectance,and color parameters of the synthesized pigment samples were investigated and characterized by X-ray diffraction(XRD),UV/Vis/NIR spectroscopy,and color CIE-L~*a~*b~*1976 color scales.The results demonstrate that all synthesized pigments have cubic perovskite structure after calcined at 1100℃.The co-doping of Cu~(2+)and Tb~(3+)is successfully introduced into the BaZrO_3lattice,and the color increasingly changes from white to gray,and to yellow with the increase of Cu~(2+)and Tb~(3+)concentration.Meanwhile,the obtained pigments possess high near-infrared solar reflectance in the range of 780-2500 nm,the average reflectance is up to 80%.Therefore,these Ba_(1–x)Cu_xZr_(1–y)Tb_yO_3cool powdered pigment have great application prospect in the building coatings.
引文
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