金属颜料对保温涂料发射性和反射性的影响

Influence of Metal Paint on Emissivity and Solar Reflectance of Insulation Coating

基于高原、严寒及寒冷地区对外墙涂料光学性能的要求,研究涂料组分中各类金属颜料对其红外发射率及太阳能反射比的影响.研究结果表明:金属颜料能显著降低油性涂料的红外发射率;颜料种类、掺量及形貌对涂料的发射率有较大影响;铜粉对油性涂料发射率的降低效果最好;发射率随颜料掺量的增加而降低,在40%～50%范围内达到最低;同掺量下片状铜粉在油性涂层中的效果优于球状的;漂浮型铝颜料对油性涂料发射率的降低效果优于非漂浮型铝颜料.水溶性金属铝粉能显著降低水性涂料的红外发射率,红外发射率和太阳能反射比均随铝粉的粒径增大而下降.上述各类涂料涂层的红外发射率均可达到0.35～0.45、太阳能反射比为0.39～0.56,基本符合采暖地区外墙涂料光学性能的要求.

Based on the optic requirement of insulation coating used for outside wall in plateau, cold and freezing area, lots of experiments were made for research on the influence of metal paint on insulation coating with low emissivity and solar reflectance. The results indicate that the infrared emissivity of oil insulation coating is digressive evidently with metal paint such as copper, aluminum and nickel. The infrared emissivity of coating is influenced by kinds of metal paint, dosage and shape of metal powder. Copper is the best. The best dosage of these metal paints is about 40%--50%. The effect of sheet copper powder on the decrease of the infrared emissivity for oil insulation coating is better than the spherical powder, and the floating aluminum powder better than the non-floating. For water soluble coating, the infrared emissivity is digressive evidently withsoluble aluminum powder and the infrared emissivity and solar reflectance decrease, but the powder particle size increases instead. The above insulation coatings are approximate with the optic requirement of insulation coating used for outside wall in plateau, cold and freezing area with infrared emissivity upto O. 35~0.45 and solar reflectance O. 39~0.56.