Reactive dyeing of soybean/casein/polyvinyl alcohol blend fibers

Reactive dyes were applied to dyeing of soybean /casein /polyvinyl alcohol blend fibers( short for double protein fibers). The influence of dyeing temperature,dyeing time,dosage of sodium carbonate and sodium chloride on dye up-take and color fixation was studied. The dyeing performance of double protein fiber and soybean protein fiber were compared. The build-up properties of these dyes were also discussed. The results showed that the optimal process of medium temperature reactive dyeing of double protein fiber was sodium carbonate 1- 2 g/L,sodium chloride 20- 40 g/L,and dyeing at 60 ℃ for more than 60 min; the optimal process of high temperature reactive dyeing of double protein fiber was sodium carbonate 0 g/L,sodium chloride 20- 40 g/L,and dyeing at 80 to 90 ℃ for more than 60 min; the dye up-take rate and color fixation rate of double protein fiber were higher than those of soybean protein fiber under the same dyeing conditions. The build-up of reactive dyes on double protein fibers was good as well.