摘要： 采用铁蓝包覆铝粉制备黄绿色红外低发射率聚氨酯无光涂层，用 SEM 及 X 射线衍射仪、红外发射率测试仪、色度仪、光泽仪分别对包覆铝粉的形态及成分、涂层的红外发射率、可见光颜色及光泽进行表征，结果表明：包覆铝粉不仅能降低涂层的光泽，而且能有效降低涂层在 8~14 μｍ 波段的红外发射率。 当包覆铝粉质量分数小于 20%时，涂膜附着力和耐冲击性优良，当其用量达到 20%~30%时，涂膜物理机械性能下降明显。 相同颜色的包覆铝粉涂层和普通铝粉调色涂层对比发现，前者具有显著的低发射率特性，主要是因为包覆铝粉具有更低的金属颗粒间距和更高的电导率。

关键词: 红外发射率, 机械性能, 铁蓝, 铝粉

Abstract: Greenish yellow lackluster coatings with low infrared emissivity were prepared by Prussian blue PB) surface modified Al powders and polyurethanes. The morphology and component of PB/Al powder, the infrared emissivity, surface gloss and visible light color were characterized by scanning electron microscopy X-ray diffractometer, infrared emissometer glossmeter, and colorimeter respectively The results indicated that PB/Al powder decreased not only the gloss but also its emissivity within the wavelength range of 8~14 μm. The composite coatings comprising PB/Al less than 20wt.% had good adhesion and impact strength, whereas,the composite coatings comprising PB/ AI 20wt %~30wt.% showed dramatically deteriorated mechanical propertles. A comparison of PB/ Al composite coating and Al powder tinting coating providing the same color and surface gloss was carried out. The result showed that PB/Al composite coating exhibited significant lower infrared emissivity, which was attributed to closer interpowder distance of metallic fillers and higher electrical conductivity in the coating.

Key words: Infrared emissivity, mechanical properties, Prussian blue, Al powder