title: The effect of solar irradiation on the fading of nylon and polyester fabrics dyed with selected disperse dyestuffs on radiant energy basis.
abstract: Solar total, UVA and UVB irradiances were measured separately using three kinds of wavelength band detectors in Tokyo, Japan in November 1999. Characteristics of diurnal variations were examined: Total irradiance reached a maximum value of about 600 W m(-2) at around noon. The variation pattern of UVA irradiance was observed to be similar to the total irradiance. The energy level was about 4.65% of total irradiance. Diurnal variation of UVB was in the form of a steeper bell curve due to the absorption in the air mass. UVB energy to solar total irradiance was about 0.07%. Photodegradation characteristics of two disperse dyestuffs were investigated on the basis of solar radiant energy. A UVA fluorescent lamp was applied to examine the fading characteristics to find the wavelength dependency. As a result, nylon dyeings were less lightfast by a factor of about 6 and 13 for C I Disperse Blue 27 and C I Disperse Blue 165, respectively, compared with polyester on the radiant energy basis. Visible light, as well as UVA, radiation contribute to fading of C I Disperse Blue 165 whereas UVA mostly cause the fading of C I Disperse Blue 27.
authors.affiliation: Department of Textile Science, Faculty of Home Economics, Kyoritsu Women's University, 2-2-1 Hitotsubashi, Chiyoda-ku, Tokyo 101-8433, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Imaizumi
authors.forename: K
authors.initials: K
authors.lastname: Yoshizumi
authors.forename: T
authors.initials: T
authors.lastname: Fujita
mesh_terms: D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects; D006801:Humans; D009757:Nylons / Q000737:chemistry* / Q000528:radiation effects; D011091:Polyesters / Q000737:chemistry* / Q000528:radiation effects; D013472:Sunlight; D014466:Ultraviolet Rays
chemical_list: D004396:Coloring Agents; D009757:Nylons; D011091:Polyesters