National Research Centre, Textile Research Division, Dokki, Cairo, Egypt.
Carbohydr Polym. 2013 Feb 15;92(2):1677-84. doi: 10.1016/j.carbpol.2012.11.035. Epub 2012 Nov 19.
Aqueous dispersions of nanoscale vat dyes were successfully prepared through ball milling and ultrasonication of three test dyes in the presence of dispersing agent. Critical factors included the time of ball milling and ultrasonication and the molecular structure of the vat dyes have been studied. These dispersions were characterized by morphological structures with particle size determination and quality was evaluated by shelf-life stability using digital images. The nanoscale vat dyes have been applied in dyeing and printing of cotton to evaluate the effect of nanoscale dispersion on the reducing agent account and the difference of coloration performance of a nanoscale and conventionally dispersed vat dyes. Results showed that use of sodium dodecyl sulfate (SDS) maintained a high stability of dispersion with storage. The size and stability of nanoscale dispersion were greatly influenced by molecular structure of the vat dyes. Ultrasonication was helpful in decreasing average particle size. Nanoscale vat dye dispersions gave a much higher color yield than conventional vat dyes. Fastness properties were excellent for washing effects. It is clear that coloration using nanoscale vat dye dispersions offer a number of advantages in terms of reducing agent requirement, improved appearance and also in environmental protection.
通过在分散剂存在下对三种测试染料进行球磨和超声处理，成功制备了纳米还原染料的水分散体。关键因素包括球磨和超声处理的时间以及还原染料的分子结构。这些分散体的形态结构通过粒径测定进行了表征，并通过使用数字图像评估储存稳定性来评估质量。纳米还原染料已应用于棉的染色和印花，以评估纳米分散体对还原剂用量的影响以及纳米和常规分散还原染料的染色性能差异。结果表明，使用十二烷基硫酸钠（SDS）可以保持分散体在储存过程中的高稳定性。还原染料的分子结构极大地影响了纳米分散体的尺寸和稳定性。超声处理有助于降低平均粒径。纳米还原染料分散体的得色率明显高于常规还原染料。耐洗牢度性能优异。显然，在还原剂用量、外观改善和环境保护方面，使用纳米还原染料分散体进行染色具有许多优势。
