The preparation and dyeing properties of pineapple leaf fibres modified with a cationic modifier

Pineapple leaf fibres were modified with cationic modifier GX‐H23 and dodecyl dimethyl benzyl ammonium chloride (surfactant 1227) to change their surface electric properties. After modification, the pineapple leaf fibres were dyed separately with CI Reactive Red 15 under traditional and salt‐free dyeing conditions. Based on dye uptake analysis, the influence of different modification and dyeing conditions on the dyeing properties of pineapple leaf fibres were evaluated. The results showed that the modified pineapple leaf fibres under salt‐free dyeing conditions exhibited superior dye uptake, especially when the cationic modifier GX‐H23 was used. The optimum parameters for modification with surfactant 1227 were: 15 g/l of surfactant 1227, 10 g/l of sodium hydroxide, and 90 °C for 30 min; the optimum parameters for modification with cationic modifier GX‐H23 were: 15 g/l of cationic modifier GX‐H23, 20 g/l of sodium hydroxide, and 60 °C for 40 min.