The aggregation structure of dye molecules has a great influence on the properties of dye solutions, especially in high concentration. Here, the dye molecular aggregation structures were investigated systemically in aqueous solutions with high concentration using three reactive dyes (O-13, R-24:1 and R-218). O-13 showed stronger aggregation than R-24:1 and R-218. This is because of the small non-conjugate side chain and its β-linked position on the naphthalene of O-13. Compared with R-218, R-24:1 showed relatively weaker aggregation due to the good solution of R-24:1. The change of different aggregate distributions in the solutions were also investigated by splitting the absorption curves. Moreover, it is found that the surface tension of solutions can be modified by the combined effect of both aggregation and the position of the hydrophilic group, which, however, also have an effect on viscosity. This exploration will provide guidance for the study of high concentration solutions.
Digital
inkjet printing technology plays an increasingly important
role in textile printing. The printing printability of reactive dye
inks is the key to improving the quality of printed fabrics. In this
study, an eco-friendly and simple method to improve the inkjet printability
of reactive dye solutions was proposed. The influence of diethylene
glycol on the surface tension, rheology, and dye molecule aggregation
properties for three reactive dye solutions was investigated. The
jetting performance of dye solutions was explored by observing droplet
formation. Moreover, the color performance of printed cotton fabrics,
including reactive dye solution penetration, colorimetric values,
and color strength, was evaluated. Addition of diethylene glycol could
change the aggregation of dye molecules by hydrophobic forces and
hydrogen bonds. Diethylene glycol could inhibit formation of satellite
droplets by changing the viscosity and surface tension of solutions,
which made the pattern printed on cotton fabrics show regular edge
sharpness. Furthermore, the dye solutions containing 10% DEG not only
satisfied various properties of reactive dye inks but also had the
highest color strength and the deepest and brightest colors.
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