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Preparation and Properties of Near-infrared Reflective Superhydrophobic Yellow Coating |
CHENG Hongjie, LIU Huangjuan, JIANG Ting, WANG Fajun( ), LI Wen |
School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, China |
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Abstract The superhydrophobic yellow coating was prepared by mixing titanium chromium brown powder (TCB), rutile titanium dioxide (TiO2), hydrophobic nano silica (SiO2) with polydimethylsiloxane (PDMS) solution and brush coating by one step. The surface wettability, hydrophobic stability, ultraviolet light aging resistance, self-cleaning performance and near-infrared reflection performance of the coating were systematically investigated. The results show that the water contact angle (CA) and roll angle (SA) of the coating are 155.2° and 5.4°, respectively; the coating retains excellent hydrophobicity after sandpaper wear at a distance of 2 m by 1.0 kPa and water impact at a distance of 5 L, meanwhile its adhesion and hardness reach grade 2 and 6B, respectively; the coating surface presents superhydrophobic effect and have chemical stability in solutions of different pH; The coating surface still retains strong hydrophobicity after ultraviolet light irradiation for 240 h, indicating that it has UV aging resistance; the coating surface has excellent self-cleaning performance, and the pollutants are easily carried away by water droplets; the near-infrared reflectance and solar reflectance of the coating are 0.858 and 0.672, respectively. The coating has obvious cooling effect on the ordinary cement board, and still maintains a high reflectance after outdoor exposure and water impact.
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Received: 16 August 2021
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Fund: Natural Science Foundation of China(51801083);Natural Science Foundation of Jiangsu Province(BK20181044) |
Corresponding Authors:
WANG Fajun
E-mail: jjbxsjz@foxmail.com
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About author: WANG Fajun, Tel: (0519)86953280, E-mail: jjbxsjz@foxmail.com
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