材料期刊网

目的 探究冷颜料在建筑节能涂层中的应用,通过降低建筑外墙温度来实现节能降耗.方法 以钛铬黄及铁黄作为颜料,改性硅溶胶-苯丙复合乳液作为成膜基料,制备了两种建筑节能涂料,探讨了两种颜料及其掺量对建筑节能涂层性能的影响.采用X射线衍射仪、紫外/可见/近红外分光光度计、精密色差仪和红外发射率测量仅,对颜料及涂层性能进行表征,采用红外灯模拟太阳热源测量涂层的隔热性能.结果 相比于铁黄,钛铬黄“冷”颜料拥有更大的晶粒尺寸和更高的近红外平均反射率,其晶粒尺寸和近红外平均反射率分别比铁黄高52.3 nm和14.06％.当钛铬黄掺量为20％时,涂层近红外平均反射率最大,最大值为68.69％,试板平衡温度较空白板及相同铁黄掺量试板分别低23.1℃和10.6℃,隔热效果明显.结论 冷颜料相比于传统铁系颜料更适宜做建筑节能涂层用颜料,具有一定的应用价值和意义,实际应用中冷颜料掺量以20％为宜.

The work aims to achieve energy saving and cost reducing by reducing exterior wall temperature and explore application of cool pigments to building energy-saving coatings.Two types of building energy saving coatings were prepared with titanium chrome yellow and iron oxide yellow as pigments and silica sol-styrene acrylic emulsion as film former.Influence of two pigments and their content on properties of building energy-saving coatings was investigated.Properties of pigments and coatings were characterized by using XRD diffractometer and ultraviolet/visible/near-infrared spectrophotometer,infrared emissivity measurement device and precise colorimeter.Infrared lamp simulating sunlight heat source were applied to analyze heat-insulating property of the coating.Grain size and near-infrared average reflectivity of cool titanium-chrome yellow were higher than that of iron oxide yellow.Grain size and near-infrared average reflectivity were 53.2 nm and 14.06％ higher than that of iron oxide yellow respectively.When content of the titanium-chrome yellow was 20％,the coatings were provided with the largest near-infrared average reflectivity,which was 68.69％.What's more,equilibrium temperature of titanium chrome yellow coating was 23.1 ℃ and 10.6 ℃ lower than contrastive samples and the same filler content of iron oxide yellow respectively.Thus,influence of heat resistance was impressive.Compared with traditional iron series pigments,cool pigments are more suitable to be applied to building energy-saving coatings.Therefore,cool pigments are of certain practical application value and significance.Proper content of the cool pigments is 20％ when applied.