The Dyeing Properties Of Polyamine Crosslinking Dyes

Crosslinking dyes can form covalent bonds with dyed fibers by crosslinking agent. The advantages of crosslinking dye are avoiding the hydrolysis of reactive dyes and at same time keeping good fastness properties, which can improve the dye utilization obviously.The solubility, molecule size and penetrability of polyamine crosslinking dyes were studied in the paper. The methods of software simulation and fiber slice validated that crosslinking dyes could obtain good dye penetrability. The effect of pH value, dyeing temperature, dyeing time and structure of dyes on dyeing properties was investigated in detail. We found that polyethylene polyamine crosslinking dyes without sulphonic groups suited exhaustion dyeing manner on protein fibers, and Exhaustion of PAD1 were 99.8% and 95.5% on silk and wool respectively; polyvinylamine crosslinking dyes without sulphonic groups suited exhaustion dyeing manner on cotton and silk fibers, and Exhaustion of PVD4 were 97.6% and 99.3% on cotton and silk, respectively. Padding method was more suitable for two kinds of crosslinking dyes with sulphonic groups.Take PAD1 and PVD4 for examples, the model of adsorption kinetics and adsorption equilibrium of polyethylene polyamine and polyvinylamine crosslinking dyes on silk, wool and cotton were discussed respectively. The results showed that the adsorption of polyethylene polyamine and polyvinylamine crosslinking dyes on silk and wool which followed pseudo second-order kinetics equation gave priority to chemisorption and adsorption equilibrium was Langmuir type. The adsorption process of polyvinylamine crosslinking dyes on cotton which belongs to pseudo first-order kinetics equation and Freundlich model is spontaneous, endothermic and dominated by physical adsorption.Effect of pH value, amount of crosslinker, crosslinking reaction temperature and reaction time on crosslinking fixation of crosslinker was studied. The color fastness and fixing condition were discussed. The results indicated that approximately 100% crosslinking ratio and good fastness could be obtained. The washfastness, dry rubfastness reached 4-5 grade and 4 grade, respectively. The type of intermolecular force between crosslinking dyes and dyed fibers was investigated by colorfastness, DMF color stripping, dyeing of polypropene fiber and IR. spectra. The formation of covalent bonds between fibers and the crosslinking dyes was comfirmed. The hydrolysis ratio of crosslinking agent was calculated and the effect of storage time and recycle application of crosslinker M on crosslinking ratio was discussed. It was found that crosslinker M with excellent reactivity was stable. Crease resistance of dyed fibers was investigated by measuring wrinkle recovery angles in this paper. When the concentration of the crosslinking dyes was 0.67 g/L on silk,1 g/L on cotton and that of the crosslinker was 20 g/L, the crease resistance of the dyed silk fabrics was comparable to that obtained from that finished with BTCA and that of the dyed cotton fabrics also was improved evidently. With the increase of the concentrations of both the crosslinking dyes and the crosslinker, the wrinkle resistance of the dyed fabrics was further improved. Furthermore, under those conditions, crosslinking fixation properties, the handle and tensile strength of the silk fabrics were still satisfactory.