The Mechanism and Characterization of Dye-Free Coloration on Tussah Silk Based on Tryptophan
In this article, tussah silk was treated with 3, 4- dihydroxy benzaldehyde solution under concentrated nitric acid conditions, and its coloration characteristic was discussed, including the effects of concentrations, temperature and time on the coloration, finally the property of the treated fiber was tested. As the results showed, the treated tussah silk was in bright yellow, and both of its color fastness to washing and rubbing achieved 4 grade or above. The optimum process was that concentrations of 3, 4- dihydroxy benzaldehyde and concentrated nitric acid were 1.5% and 3% respectively, reacting temperature was 70 °C, reacting time was 10min and bath ratio was 1:25.
Lun Bai and Guo-Qiang Chen
Y. L. Sui et al., "The Mechanism and Characterization of Dye-Free Coloration on Tussah Silk Based on Tryptophan", Advanced Materials Research, Vols. 175-176, pp. 656-660, 2011