ZnO纳米团簇对反射型隔热涂料隔热性能的影响

Effect of ZnO nano aggregates on the heating insulation performance of reflecting insulation coating

以二水合乙酸锌为原料,NaOH为矿化剂,以乳酸、柠檬酸和聚丙烯酸钠为多官能度改性剂,采用水热法结合自组装形成氧化锌纳米片球状团簇;在二氧化钛/乙基纤维素多孔微球基反射型隔热涂料的基础上,加入纳米氧化锌球状团簇,分析了纳米氧化锌球状团簇对隔热涂层隔热性能的影响。结果表明:改性剂官能度对所得粒子形貌有较大的影响,添加包括乳酸、柠檬酸以及聚丙烯酸钠在内的多官能度改性剂可得到氧化锌纳米片球状团簇结构,其在8~14μm光谱区域内的红外辐射率为0.88;氧化锌纳米团簇进一步改善了涂层的隔热性能,当氧化锌纳米片球状团簇添加量为1.0%时,所得涂层的隔热性能最好,30 min后样板温度为63.9℃。

ZnO nanosheets based spherical aggregates were prepared by hydrothermal process with zinc acetate dehydrate as precursor,NaOH as themineralizer,and lactic acid,citric acid and sodium polyacrylate as multifunctional modifier. On the basis of coatings with titania/ethyl cellulose(EC) composite porous microspheres,ZnO nano aggregates were added to improve heating insulation performance. The results show that functionality of the modifier has a greater impact on the morphology of the obtained parti-cles,and the addition of polyfunctional modifier including lactic acid,citric acid,and sodium polyacrylate is beneficial to obtain a spherical clusters of zinc oxide nano-sheet structure,the infrared emissivities of ZnO nano aggregates in the 8 ~14 μm region is 0.88. Compared with the coating without functional pigments,the coatings with the additive ZnO particles further improve the insulation performance of the solar reflecting insulation coating;When the amount of ZnO particles is 1%,the best insulation performance can be obtained,and the temperature of the sample plate after 30 min irradiation is 63.9 ℃.