- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | GUAN Wenxun, SONG Ben, CHENG Guanzhi, LI Wang, XIE Yongjiang, ZHU Congcong, XIAO Chang. Fabrication of Reflective Insulation Coating with Medium Brightness for Controlling Track Slab Temperature[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240265
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To mitigate the deformation and upward arching defects prone to occur in the longitudinally continuous ballastless track structures of high-speed railway under high-temperature conditions, a reflective insulation coating with medium brightness and high reflective properties was formulated by using self-made fluorine-modified black pigments. This coating can effectively control the temperature while avoiding the visual damage caused by conventional white reflective coating with high brightness to people seeing it. The molecular structure of the self-made fluorine-modified black pigment was characterized by infrared spectroscopy. The mechanism underlying the high solar reflectance performance of the self-made black pigment was elucidated by using a UV-VIS-NIR spectrophotometer, with a comparison made against conventional cool pigments. Based on this, a reflective thermal insulation coating with medium brightness was developed, and the properties of the film-formed coating, including temperature control, adhesion, and durability, were tested. Furthermore, the full-scale track slab structures under natural exposure conditions were coated, and long-term temperature monitoring and analysis were conducted to evaluate the actual temperature control effect of the coating. The results show that the self-made fluorine-modified black pigment can effectively improve the solar reflectance performance of the reflective thermal insulation coating with medium brightness through the transparency characteristics of its near-infrared band. The solar reflectivity of the self-made coating can be increased by more than 7.2% compared to the coating with medium brightness by using conventional pigments. The insulation temperature difference under simulated solar radiation can be increased by more than 3 ℃. The coating possesses good uniformity, adhesion, and resistance to ultraviolet-induced aging. Under typical sunny conditions, it can reduce the surface peak temperature of a full-scale track slab structure by more than 10 ℃, the daily temperature difference on the surface by 5–10 ℃, and the longitudinal positive temperature gradient of the track slab by about 50%.
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