结构色调温涂层的构筑及性能

Preparation and performance of thermoregulation coatings with structural color

摘要:

本研究创新性构筑了一种具有亮丽结构色和调温功能的结构色调温涂层,以非虹彩结构色中空二氧化硅纳米微球(H-SiO2)为生色组分、硬脂酸(SA)为相变组分,制备彩色相变涂料(H-SiO2@SA),利用水性丙烯酸乳液(WA)为粘合剂,通过在基质上依次刷涂WA、H-SiO2@SA、WA制备得到非虹彩结构色定形调温涂层。研究表明,涂层最高熔化相变焓和结晶相变焓分别达到70.01 J/g和67.57 J/g,在高温下具有稳定的光学性能,且经过强酸碱浸泡、多次摩擦及水流冲洗等作用,涂层颜色仍保持不变。此外,涂层具有良好的热循环稳定性和相变调温功能,能有效缓冲外界环境温度的变化。本研究不仅为结构色材料与相变材料的结合提供了新思路,而且为智能调温结构色材料的简易制备提供了新方法。

Abstract:

Phase change material has the capability to absorb or release amounts of energy through phase transition, making it extensively utilized in the field of temperature regulation. In particular, phase change coating is a unique form of phase change material that can be administered onto the surfaces of objects owing to its distinctive adaptability and ease of use, making it more attractive in practical applications. However, phase change materials currently suitable for coatings only exist in the form of microcapsules. It is a great challenge to expand the application of phase change materials in coatings. Moreover, inorganic or organic pigments are commonly incorporated to fulfill the color requirements of coatings. These pigments often have limitations such as high toxicity and susceptibility to photo-oxidative fading. Hence, it is of great significance to develop novel colored thermoregulation coatings that are both environmentally friendly and color-stable. This work utilized hollow silicon dioxide nanospheres (H-SiO2), a non-iridescent structural color material, as the coloring element and stearic acid (SA) as the component for the phase change to create colored thermoregulation paints (H-SiO2@SA). Additionally, a water-based acrylic emulsion (WA) was employed as a binding agent to prepare a shape-stable phase change coating with non-iridescent structural color by applying layers of WA, H-SiO2@SA, and WA onto the surface sequentially. It is demonstrated that the coating has a maximum melting phase change enthalpy of 70.01 J/g and a crystallization phase change enthalpy of 67.57 J/g, respectively. The optical properties are stable even when the coating is exposed to high temperatures. Moreover, even after undergoing rigorous treatments such as strong acid and alkali immersion, repeated friction, and water washing, the structural color of the coating remained. Furthermore, the coating has good thermal stability and does not decompose within 150℃. The enthalpy and temperature of the phase change of the coating do not change after 100 thermal cycles. In addition, the high phase change enthalpy endows the coating thermoregulation function, which makes it potential for thermal management applications. This study not only provides a new idea for the combination of structural color materials and phase change materials but also provides a new method for the simple preparation of intelligent thermoregulated structural color materials.