| ZHANG Wei-gang,ZHENG Meng-ying,LYU Dan-dan.Preparation and Performance Characterization of Superhydrophobic Low Infrared Emissivity Composite Coating[J],49(7):105-111 |
| Preparation and Performance Characterization of Superhydrophobic Low Infrared Emissivity Composite Coating |
| Received:November 20, 2019 Revised:July 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.07.013 |
| KeyWord:composite coating nano-SiO2 infrared emissivity glossiness water contact angle |
| Author | Institution |
| ZHANG Wei-gang |
Chuzhou University, Chuzhou , China |
| ZHENG Meng-ying |
Chuzhou University, Chuzhou , China |
| LYU Dan-dan |
Chuzhou University, Chuzhou , China |
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| Abstract: |
| The work aims to prepare a low infrared emissivity coating with superhydrophobic property. Various types of modified and unmodified polydimethylsiloxane (PDMS)/Al composite coatings were prepared by scratch coating method with nano-SiO2 as micro-nano structural modifier, PDMS as resin matrix and Al powders as functional pigments, respectively. The effects and causes of the ratio of PDMS to Al powders, the addition amount of nano-SiO2 and the surface micro-nano structural layer on the coating properties were discussed. The ratio of PDMS and Al powder had a significant effect on the emissivity and glossiness of the coating. When the ratio of PDMS to Al powders was 6∶4, the emissivity and glossiness of the coating could be as low as 0.265 and 10.3, respectively. The water contact angle could reach 109.5°, which was significantly higher than that of conventional resin-based low emissivity coating. Adding nano-SiO2 could significantly increase the roughness of the coating, thereby significantly enhancing the hydrophobicity of the coating. When the amount of nano-SiO2 was 8%, the water contact angle of the coating increased to 130° and the emissivity and glossiness of the coating could still be as low as 0.330 and 9.8. The PDMS/SiO2 micro-nano structural layer formed a distinct papillary micro-nano structure on the surface of the PDMS/Al composite coating, so that the coating achieved superhydrophobic property. When the ratio of PDMS to nano-SiO2 was 7∶3, the water contact angle of the modified coating could be as high as 156°, and the coating had a relatively low emissivity (0.661) and extremely low glossiness (2.1) performance. The compatibility of superhydrophobic property, low emissivity and low glossiness of the PDMS/Al composite coating can be achieved by constructing a micro-nano structural layer with a certain thickness on the surface of the coating. |
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