Abstract
The dyeing process of soybean protein/flax blended yarns with reactive dyes (containing monofunctional or bifunctional groups) and the method of improving the color fastness of dyed yarns treated with an ecofriendly formaldehyde-free fixing agent were studied. Influence factors such as sodium carbonate concentration, salt concentration, fixation time and temperature were analyzed, the optimum processes to soybean protein/flax blended yarns dyed with the two reactive dyes were determined: the soybean protein/flax blended yarns were dyed with Reactive Yellow K-R at a bath to material ratio of 20:1, dye concentration 2% owf., sodium chloride 40 g/L, sodium carbonate 10 g/L, fixed at 85 °C for 30 min; and dyed with Reactive Yellow B-4RFN at a bath to material ratio of 20:1, dye concentration 2% owf., sodium chloride 50 g/L, sodium carbonate 15 g/L, fixed at 70 °C for 50 min. The application processes of formaldehyde-free fixing agent DM-2158 were also determined. Performance test results indicated that both K-type and B-type reactive dyes had good colorfastness to washing and rubbing, and B-type reactive dyes showed a higher fixing effect than K-type reactive dyes. The application of a formaldehyde-free fixing agent to dyed products improved the colorfastness to washing and rubbing, especially for blended yarns dyed with K-type reactive dyes.
Highlights
The dyeing process of soybean protein/flax blended yarns with reactive dyes and the method of improving the color fastness of dyed yarns treated with an ecofriendly formaldehyde-free fixing agent were studied
The bleached blended yarns were dyed at a bath to material ratio 20:1 with Reactive Yellow K-R (NaCl 40 g/L, N a2CO3 10 g/L, fixed 30 min) and Reactive Yellow B-4RFN (NaCl 50 g/L, Na2CO3 15 g/L, fixed 40 min)
The bleached blended yarns were dyed at a bath to material ratio 20:1 with Reactive Yellow K-R (Na2CO3 10 g/L, fixed at 85 °C for 30 min) and Reactive Yellow B-4RFN ( Na2CO3 15 g/L, fixed at 75 °C for 40 min)
Summary
The dyeing process of soybean protein/flax blended yarns with reactive dyes (containing monofunctional or bifunctional groups) and the method of improving the color fastness of dyed yarns treated with an ecofriendly formaldehyde-free fixing agent were studied. The blended products can compensate for the limitations of flax fiber and overcome the limitations of soybean protein fiber, making themselves suitable to obtain high-quality products They can be spun into high count yarns, knitted into single- and double-side rib jacquard knitting fabrics, and made into garments after processing. The purpose of this study was to optimize the dyeing process of soybean protein/flax blended yarns with reactive yellow K-R and reactive yellow B-4RFN by analyzing and comparing the dyeing properties of the two different types of reactive dyes, and to further improve the color fastness of dyed yarns by fixing the dyed yarn with the ecofriendly formaldehyde-free color fixing agent DM-2518. The dyed samples were analyzed by infrared spectroscopy
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