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| Preparation and Study of High Reflective Near Infrared Heat-Insulation Film |
| JING Jiang1, GU Xiao-yu1*, ZHANG Sheng1 , LI Hong-fei1, SUN Jun1, CHEN Yu2 |
1. Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China
2. Beijing Huateng Hightech Corp., Beijing 100084, China |
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Abstract BiOCl was prepared by solvothermal method, and the reflection of BiOCl to near-infrared light was studied. The crystal structure and chemical composition of BiOCl were characterized by X-ray diffraction (XRD) and electron spectroscopy (EDS). Under the observation of scanning electron microscopy (SEM), BiOCl exhibited homogeneous flower-like microspheres with outer diameter of 3~5 μm, composing by intertwined nano-sheets with open channels. The absorption and reflection spectra of BiOCl were analyzed by UV-Vis-NIR spectrometer in the wavelength range of 220~2 500 nm. Its forbidden band width is 3.69 eV, which is greater than the calculated value of 2.62 eV. The results indicated that the photocatalytic concentration of BiOCl has changed, and the absorption edge was blue shifted. The reflectivity in the visible region (300~750 nm) is 67.3%, and it is over 99.8% in the near infrared region of 750~2 500 nm. Finally, BiOCl particles were dispersed in polyvinyl alcohol (PVA) solution to prepare film by coating process. With the increase of BiOCl content, the heat-insulation properties of BiOCl/PVA was improved accordingly. When the amount of BiOCl was 1.5%, the temperature inside of the insulation box decreased 4.5 ℃, the reason is the incident frequency of near-infrared light is higher than that of BiOCl particles, resulting in a high reflection. For the energy distribution in the near infrared region has been impeded and reflected, the temperature inside the insulation box was then reduced.
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Received: 2017-07-10
Accepted: 2017-12-17
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Corresponding Authors:
GU Xiao-yu
E-mail: guxy@mail.buct.edu.cn
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