Zhang Le, Liu Ying, Bai Xuefeng, Ding Hao, Wang Xuan, Chen Daimei, Zhang Yihe
Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Xueyuan Road, Haidian District, Beijing 100083, China.
Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham, University Park, Nottingham NG7 2RD, UK.
Nanomaterials (Basel). 2025 Jul 20;15(14):1127. doi: 10.3390/nano15141127.
The superhydrophobic coatings for outdoor use need to be exposed to sunlight for a long time; therefore, their UV-aging resistances are crucial in practical applications. In this study, the primary product of titanium dioxide (P-TiO) was used as the raw material. Nano-silica (SiO) was coated onto the surface of P-TiO by the acid precipitation method to prepare P-TiO-SiO composite particles. Then, they were modified and sprayed simply to obtain a superhydrophobic P-TiO-SiO/HDTMS coating. The results indicated that amorphous nano-SiO was coated on the P-TiO surface, forming a micro-nano binary structure, which was the essential structure to form superhydrophobic coatings. Additionally, the UV-aging property of P-TiO was significantly enhanced after being coated with SiO. After continuous UV irradiation for 30 days, the color difference (ΔE*) and yellowing index (Δb*) values of the coating prepared with P-TiO-SiO increased from 0 to 0.75 and 0.23, respectively. In contrast, the ΔE* and Δb* of the coating prepared with P-TiO increased from 0 to 1.68 and 0.74, respectively. It was clear that the yellowing degree of the P-TiO-SiO coating was lower than that of P-TiO, and its UV-aging resistance was significantly improved. After modification with HDTMS, the P-TiO-SiO coating formed a superhydrophobic P-TiO-SiO/HDTMS coating. The water contact angle (WCA) and water slide angle (WSA) on the surface of the coating were 154.9° and 1.3°, respectively. Furthermore, the coating demonstrated excellent UV-aging resistance. After continuous UV irradiation for 45 days, the WCA on the coating surface remained above 150°. Under the same conditions, the WCAs of the P-TiO/HDTMS coating decreased from more than 150° to 15.3°. This indicated that the retention of surface hydrophobicity of the P-TiO-SiO/HDTMS coating was longer than that of P-TiO/HDTMS, and the P-TiO-SiO/HDTMS coating's UV-aging resistance was greater. The superhydrophobic P-TiO-SiO/HDTMS self-cleaning coating reported in this study exhibited outstanding UV-aging resistance, and it had the potential for long-term outdoor use.
户外使用的超疏水涂层需要长时间暴露在阳光下；因此，它们的抗紫外线老化性能在实际应用中至关重要。在本研究中，以二氧化钛初级产物（P-TiO）为原料。采用酸沉淀法将纳米二氧化硅（SiO）包覆在P-TiO表面，制备P-TiO-SiO复合颗粒。然后，对其进行改性并简单喷涂，得到超疏水的P-TiO-SiO/HDTMS涂层。结果表明，无定形纳米SiO包覆在P-TiO表面，形成微纳二元结构，这是形成超疏水涂层的关键结构。此外，P-TiO包覆SiO后，其抗紫外线老化性能显著增强。连续紫外线照射30天后，P-TiO-SiO制备的涂层的色差（ΔE*）和黄变指数（Δb*）值分别从0增加到0.75和0.23。相比之下，P-TiO制备的涂层的ΔE和Δb分别从0增加到1.68和0.74。显然，P-TiO-SiO涂层的黄变程度低于P-TiO，其抗紫外线老化性能显著提高。经HDTMS改性后，P-TiO-SiO涂层形成超疏水的P-TiO-SiO/HDTMS涂层。涂层表面的水接触角（WCA）和水滑动角（WSA）分别为154.9°和1.3°。此外，该涂层表现出优异的抗紫外线老化性能。连续紫外线照射45天后，涂层表面的WCA保持在150°以上。在相同条件下，P-TiO/HDTMS涂层的WCA从150°以上降至15.3°。这表明P-TiO-SiO/HDTMS涂层表面疏水性的保持时间比P-TiO/HDTMS长，且P-TiO-SiO/HDTMS涂层的抗紫外线老化性能更强。本研究报道的超疏水P-TiO-SiO/HDTMS自清洁涂层表现出优异的抗紫外线老化性能，具有长期户外使用的潜力。
