Calovi Massimo, Rossi Stefano
Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy.
Materials (Basel). 2023 Nov 8;16(22):7086. doi: 10.3390/ma16227086.
This work aims to highlight the multiple features shown by curcuma-based pigment and rice bran wax, which can be selectively employed as bio-based additives for the realization of multilayer wood coatings with multiple functionalities, harnessing the capabilities of the two environmentally friendly fillers, in line with current environmental sustainability trends. The role of the two green materials on the morphology of the composite layers was examined through observations employing scanning electron and optical microscopy, revealing a strong alteration of the film's appearance, both its color and reflectivity. Additionally, their influence on the paint's resilience was assessed by exposing the samples to UV-B radiation and consecutive thermal shocks. The coating displayed a clear and uniform change in color because of substantial curcuma powder photo-degradation but it remained exceptionally stable when subjected to thermal stresses. Moreover, the protective properties of the coatings were evaluated by conducting liquid resistance tests and water uptake tests, while the hardness and the abrasion resistance of the coatings were assessed to evaluate the effect of the additives on the mechanical properties of the coatings. In conclusion, this study showcases the promising joint action of curcuma-based pigment and rice bran wax in multilayer coatings. This combination offers vibrant yellow tones and an appealing appearance to the paint, enhances the surface's water-repellent properties, and improves the mechanical resistance of the coatings.
这项工作旨在突出姜黄基颜料和米糠蜡所展现的多种特性，它们可被选择性地用作生物基添加剂，以实现具有多种功能的多层木器涂料，利用这两种环保填料的性能，符合当前环境可持续发展趋势。通过扫描电子显微镜和光学显微镜观察，研究了这两种绿色材料对复合层形态的作用，结果显示薄膜的外观，包括颜色和反射率，都有显著变化。此外，通过将样品暴露于UV - B辐射和连续热冲击下，评估了它们对涂料弹性的影响。由于大量姜黄粉的光降解，涂层颜色发生了明显且均匀的变化，但在热应力作用下仍保持异常稳定。此外，通过进行耐液体性测试和吸水性测试来评估涂层的防护性能，同时评估涂层的硬度和耐磨性，以评估添加剂对涂层机械性能的影响。总之，本研究展示了姜黄基颜料和米糠蜡在多层涂料中具有前景的协同作用。这种组合为涂料提供了鲜艳的黄色调及吸引人的外观，增强了表面的疏水性能，并提高了涂层的机械抗性。
