Yu Bin, Liu Huicong, Chen Haining, Li Weiping, Zhu Liqun, Liang Weitao
School of Materials Science and Engineering, Beihang University No. 37 Xueyuan Road, Haidian District Beijing 100191 People's Republic of China
RSC Adv. 2023 Feb 6;13(7):4542-4552. doi: 10.1039/d2ra07237h. eCollection 2023 Jan 31.
Hydrophobic coatings have attracted extensive research due to their broad application prospects. However, hydrophobic coatings in practical applications are often limited by their insufficient stability and are difficult to be applied on a large scale. In this regard, wear and heat resistance are key aspects that must be considered. In this paper, a method for preparing a robust hydrophobic coating with modified ZrO particles as the core component and modified acrylic resin is proposed. First, γ-aminopropyltriethoxysilane (APTES) was used to silanize ZrO to obtain Si-ZrO nanoparticles, which were grafted with amino groups. Then, the nanoparticles reacted with isocyanates to be grafted with hydrophobic groups. A simple spray method was developed to deposit a hydrophobic (141.8°) coating using the mixture containing the modified nanoparticles and non-fluorinated water-based silicon-modified acrylic resin (WSAR) that was prepared by free radical polymerization. The obtained coating exhibited a rough surface and the particles and resin were closely combined. Compared with pure resin coating, the composite coating exhibited 150% enhancement in wear resistance and it could wear 45 meters at a pressure of 20 kPa. Moreover, the coating could maintain the hydrophobic property even when it lost 70% quality or after it was heated at 390 °C. The thermogravimetric results showed that the temperature could reach 400 °C before the quality of the fluorine-free coating dropped to 90%. In addition, the coating could easily take away graphite or silicon carbide powder under the impact of water droplets, showing excellent self-cleaning performance.
疏水涂层因其广阔的应用前景而吸引了广泛的研究。然而，实际应用中的疏水涂层往往受到稳定性不足的限制，难以大规模应用。在这方面，耐磨性和耐热性是必须考虑的关键因素。本文提出了一种以改性ZrO颗粒为核心成分和改性丙烯酸树脂制备坚固疏水涂层的方法。首先，使用γ-氨丙基三乙氧基硅烷（APTES）对ZrO进行硅烷化以获得接枝有氨基的Si-ZrO纳米颗粒。然后，纳米颗粒与异氰酸酯反应以接枝疏水基团。开发了一种简单的喷涂方法，使用含有改性纳米颗粒和通过自由基聚合制备的非氟化水基硅改性丙烯酸树脂（WSAR）的混合物来沉积疏水（141.8°）涂层。所得涂层表面粗糙，颗粒与树脂紧密结合。与纯树脂涂层相比，复合涂层的耐磨性提高了150%，在20 kPa的压力下可磨损45米。此外，该涂层即使在质量损失70%或在390°C加热后仍能保持疏水性。热重分析结果表明，在无氟涂层质量降至90%之前，温度可达到400°C。此外，该涂层在水滴冲击下能够轻松带走石墨或碳化硅粉末，表现出优异的自清洁性能。
