Enhanced wash-fastness of cotton fabric dyed with a composite of chitosan-natural dyes extract of Ceriops tagal

Abstract

Chitosan coating on dyed cotton fabric by the natural dye of Tingi (Ceriops tagal) has been done to improve the wash fastness. Hydrophobic coating using HDTMS (hexadecyltrimethoxysilane) was also introduced to obtain multifunctional textiles. Fabric dyeing was done by the dip-coating method in two ways, one-pot (Op) and layer-by-layer (LbL). Specular-reflectance (SR) UV-Vis spectrophotometer was used to access the dyeing quality. An infrared spectrophotometer evaluation was performed to indicate the possible interaction between chitosan and the dye on the dyed cotton fabrics. The leaching degree was determined by using sodium dodecyl sulfate (SDS) and lerak (Sapindus rarak) natural surfactant as the leaching agents. The results showed that LbL coating has shown better dye-coverage on the cotton fabrics compared to the Op coating. However, cotton fabric coated by chitosan/tingi (Op) showed better performance than that of the LbL, with a leaching degree of 6.2% on SDS leaching, and 4.1% on lerak’s leaching. While, for LbL coating, the leaching degree was 20.1% on SDS and 13.9% on lerak’s leaching. The hydrophobic coating was stable and not affected by leaching. Different types of molecular interaction between the dye and chitosan from different coating techniques may result in those different performances on leaching.