Study Of Dyes'(Pigments') UV-VIS-NIR Reflectence Spectroscopy And Its Application

In summer, under strong sunlight the fabric will absorb sunlight in the visible and infrared, causing the fabric's surface temperature increased rapidly. Especially in dark colored fabric, the fabric's surface temperature is higher than the light color fabric's surface temperature. Using the thermal resistance of the fabric is difficult to reduce the mass temperature inside the fabric, but may cause the temperature inside the fabric higher than the external temperature, the heat inside to the outside environment can not be conducted, so that the temperature inside the fabric rise faster and higher. Currently, two methods commonly used to reduce the temperature of the fabric surface and inside: one is using the reflective dyes, dyes can intensely reflect UV-near-infrared light; the other is using paint with sunlight reflective coating on the fabric.Firstly, the reflection properties of reactive dyes was studied by staining the fabric of the reflection spectrum curve, indicating that the reflectance of the dyed fabric is lower than before staining, reactive dyes have a near-infrared absorption and reflection properties of visible light, the strength of absorption and reflection is different with different dyes structure. Dyes containing the structure of methoxy will have near-infrared absorption, is not conducive to near-infrared reflectance. Azo, triazine structure is important factor affect near-infrared reflectance. The reactive dyes'role of improving the performance of the fabric's near-infrared reflectance is not great.Coating the fabric with several dopes was studies, and UV - visible - near infrared reflectance coating was prepared. Analysis shows that the structure of the dopes will affect the performance of the reflection coating. The near infrared reflectance of the Anthraquinone-type structure with higher molecular planarity could be higher, and quinolyl and the formation of intramolecular hydrogen bonds, making the molecular polarity increases, so the reflectivity was higher. By coating on PET (polyethylene terephthalate) substrate of the milling time, coating thickness, the structure of the coating, the reflection properties of the coating, and paint pigments absorption was studied. Law for the UV-VIS-NIR reflectance spectra of powder characterization methods of the energy gap was brought forward.