抄録
The photofading behaviors of azo disperse dyes on polylactide fabrics were investigated. The fabrics were dyed with 1% owf of 12 commercial dyes, whose chemical structures are known. When they were exposed to a carbon arc light source, their discoloration increased with increase in exposure time. The photofading behavior was proved to be correlated with the chemical structures. The dyes containing cyanoethyl or acetoxyethyl group as 4'-substituent, Disperse Red 50, Red 82 and Orange 30, showed high light fastness. Cyano or chloro group showed a positive effect on the light fastness, and methyl group did a negative one. The samples of Disperse Red 50 and Red 82 showed the highest light fastness grades, 4.19 and 4.00, respectively. Their light fastness depended on the amount of sorbed dye, and a deeper color fabric tended to have a higher light fastness than a paler color one. The light fastness of the fabric dyed with 0.01% owf of Disperse Red 50 was ca. 4 grade lower than that of 2% owf. The sample of Disperse Red 82 showed a similar dependence on the amount of sorbed dye, but the light fastness was not so strong in comparison with Disperse Red 50.
