Effects of introduced chemical groups on the dyeability of cotton fabrics with Phellodendron amurense Rupr.

The dyeability of cotton fabrics with natural basic dye, Phellodendron amurense Rupr. was improved by applying anionic and hydrophobic groups on cotton fibers. The dye uptake was increased by interactional force and the change of fine structure by fiber modification. After introducing cross-linking using formaldehyde, the wash fastness had been improved. The wash fastness relied on the degree of swelling of fabric during washing and the number of the entrapped dyes.