Dyeing studies with hydroxyanthraquinones extracted from Indian madder. Part 1: Dyeing of nylon with purpurin

Authors: Gupta D.; Kumari S.; Gulrajani M.

Source: Coloration Technology, Volume 117, Number 6, 2001 , pp. 328-332(5)

Publisher: Society of Dyers and Colourists

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Abstract:

Purpurin (1,2,4-trihydroxyanthraquinone) is the major colorant present in the roots of Indian madder (Rubia cordifolia). Its structure is similar to that of disperse dyes. To gain an understanding of the dye–fibre interactions involved, kinetic and thermodynamic studies have been conducted with purpurin on nylon fibre. Dyeing corresponds to the Nernst isotherm as linear isotherms were obtained. The dye is found to be sensitive to pH and high temperature. The rate of dye uptake, diffusion coefficient, standard affinity, heat of dyeing and entropy have been calculated and discussed. For part 2 of this study, see page 333 of this issue of Coloration Technology

Language: English

Document Type: Regular paper

Affiliations: 1: Department of Textile Technology, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India. Email: mlg54@hotmail.com

Publication date: 2001-01-01

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