Preparation of IR reflective green pigment
Conference proceedings article
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Publication Details
Author list: Thongkanluang T., Limsuwan P., Rakkwamsuk P.
Publisher: Trans Tech Publications
Publication year: 2008
Volume number: 55-57
Start page: 805
End page: 808
Number of pages: 4
ISBN: 9780878493562
ISSN: 1022-6680
Languages: English-Great Britain (EN-GB)
Abstract
This research article reports a development on green pigments having high reflectance of NIR radiation from the sun. The aim of the development is to use the green pigments as a component of building paint to reduce heat penetrating into the building. Cr2O3, a green pigment oxide, was used as the host component and the mixtures of Al2O3, V 2O5 and TiO2 were used as the guest components. Al2O3, V2O5 and TiO2 were mixed at different 36 compositions according to triaxial diagram. For each sample preparation, 80% wt Cr2O3 was mixed with 20%wt of guest component for each composition. Then the mixed sample were calcined at 1150 °C for 4 hours and were ground with an agate ball mill for 7 minutes at a speed of 250 rev/min. Finally, the pigments were sieved to obtain the particle sizes of 0.5 - 2.0 μm. The pigment powders were compressed in a mold to get samples in the form of thin disks, each one with a diameter of 2.7 cm and a thickness of 4 mm. The reflectance for all samples was measured using a spectrophotometer in the wavelength ranging from 300 - 2100 nm in accordance with ASTM E891. It was found that the maximum reflectance, in the wavelengths ranging from 780 - 2100 nm, of 82.83% was obtained from the sample with a composition of 80%Cr2O3, 14%Al2O3, 4%TiO2 and 2% V2O5. © 2008 Trans Tech Publications, Switzerland.
Keywords
Green pigment, IR reflection
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