醌式噻吩染料的分散性及其对染色性能的影响

Dispersion property of quinoidal thiophene dyes and their effect on dyeing performance

醌式噻吩染料因分子时刻处于高度平面状态而具有极强的分子间作用力,致使染料易于聚集而难以在水中分散,并最终对上染产生不利影响。因此,有必要对醌式噻吩染料的分散性能进行研究。选用两支自制的具有代表性的醌式联二噻吩染料D1和D2,并以常规偶氮染料C.I.分散橙30为参考,研究了醌式噻吩染料的分散性、稳定性及其对染色性能的影响规律。结果表明:在研磨初始1h内醌式噻吩染料D1和D2的分散效率低于C.I.分散橙30,但经12h充分研磨达到分散平衡后,染料D1和D2分散液的染料颗粒平均粒径低于C.I.分散橙30,且稳定性更好;染料单分子态的形成是醌式噻吩染料对涤纶纤维上染的关键,染料颗粒平均粒径越小,上染率越高,而染色织物色牢度不受染料粒径影响。

Quinoidal thiophene dyes have strong intermolecular interaction because of their high molecular planarity, which makes the dyes easy to gather and difficult to disperse in water, leading to poor dyeing performance on fibers. Therefore, it is necessary to study the dispersion property of quinoidal thiophene dyes. The dispersion, stability and their effect on dyeing performance of two typical self made quinoidal thiophene dyes DI andD2 were studied by referring to conventionalazo dyeC.I, disperse orange 30. The results showed that although the dispersion efficiencies of dyes DI and D2 were lower than that of C.I. disperse orange 30 in one hour after grinding started. But, the average size of dye particles in dye dispersion solution of dyes DI and D2 was lower than that of C. I. disperse orange 30 after full grinding for 12 h and the stability was better. The formation of the single molecular state of quinoidal thiophene dye is akeyfactor to the dyeing of polyester fiber. The smaller the dyes＇ average particle size was, the higher the dye uptake could achieve. The color fastness of the dyed fabric was not affected by the particle size of quinoidal bithiophene dye.