聚氨酯/青铜-Sm_2O_3复合涂层的近红外吸收与发射率性能

Near-infrared Absorption and Infrared Emissivity Properties of Polyurethane/Bronze-Sm_2O_3 Composite Coatings

以青铜（bronze）粉与Sm2O3为复合颜料,聚氨酯（PU）为黏合剂,制备了PU/bronze-Sm2O3复合涂层。系统研究了涂层的红外发射率、近红外吸收性能及力学性能。结果表明：Sm2O3的存在可有效降低涂层对1.06μm与1.54μm近红外光的反射率,青铜粉的存在可有效降低涂层在8-14μm波段的红外发射率;通过调节青铜粉与Sm2O3质量比,涂层在8-14μm波段的红外发射率可在0.422-0.782范围内调节,涂层对1.06μm与1.54μm近红外光的反射率可分别在46.8%-65.0%和49.3%-70.7%范围内调节;所制备PU/bronze-Sm2O3复合涂层具备优良的力学性能,在不同青铜粉与Sm2O3质量比下,其附着力与耐冲击强度分别可达到1级和50kg·cm。

Polyurethane（PU）/bronze-Sm2O3 composite coatings were prepared through a simple and convenient process by using bronze-Sm2O3 as the pigments and PU as the adhesives,respectively.The infrared emissivity,near-infrared absorption property,and mechanical properties of as-prepared coatings were systematically investigated.The results indicate that the existence of Sm2O3 can obviously decrease the near-infrared light reflectivities at 1.06μm and 1.54μm,the existence of bronze powders can effectively reduce the infrared emissivity at the wavelength of 8-14μm.By adjusting the mass ratio of bronze to Sm2O3,the infrared emissivity at the wavelength of 8-14μm can be tuned from 0.422 to 0.782,and the reflectivities at 1.06μm and 1.54μm can be tuned from 46.8%to 65.0%and 49.3%to 70.7%,respectively.In addition,the coatings have good mechanical properties,the adhesion and impact strength of the coatings with different mass ratios of bronze to Sm2O3 can reach grade 1and50kg·cm,respectively.