Properties of Sorghum Red Pigment and its Application to Rayon Fabric Dyeing

摘要

Natural dye sorghum red pigment is a kind of natural product from sorghum shell. In this paper, the sorghum red pigment was extracted from a black sorghum shell produced. The spectrum property of and photostability were analysized. The results showed that the maximum absorption wavelength of the sorghum red pigment changed with pH values. The light stability changed with pH values under light and no light conditions. Then rayon fabrics were dyed with direct dyeing method by orthogonal experiments. The result indicated that the sorghum red pigment has good property for rayon fabric dyeing, the rubbing and washing color fastness of rayon fabric samples are reach to the requirement of textile dyeing.