碱剂对丝绸活性染料冷堆印花固着率的影响

Influences of alkali on fixation of cold batch reactive printing of silk

丝绸活性染料冷堆印花工艺中,可采用色浆直接加碱法和面料轧碱法进行固色试验。比较这两种施碱方法中碱剂类型和用量对印花固着率影响的试验结果表明,色浆直接加碱工艺宜采用2%碳酸氢钠(除活性橙F2R需要用6%外),面料轧碱法的碱剂为氢氧化钠/碳酸钠组合,最佳用量为2.5%/5.0%;面料轧碱法的固着率比色浆直接加碱法略高,但耗能多,且面料表面存在颜色不匀、泛黄等问题;色浆直接加碱法则简单易行,冷堆印花质量较好。

In cold batch printing of silk with reactive dyes, two fixing methods of alkaline added to color paste directly and fabric padded alkaline are used. Influences of type and amount of alkali on fixation are compared. The results show that for the former process, 2% sodium bicarbonate （ except of reactive orange F2R using 6%） should be added, while for the latter process, sodium hydroxide / sodium carbonate mixture of 2.5% / 5.0% should be used. The fixation of latter method is slightly higher than that of the former method, but there are problems of high energy consumption, uneven dyeing and yellowing of silk fabrics, so that method of adding alkali to paste is preferred, the process is simple and the printing quality is better.