靛蓝隐色酸对维纶的染色工艺

Dyeing vinylon with indigo acid-leuco

为提高维纶的得色量,采用靛蓝隐色酸染色,并对染色工艺进行研究。分析染浴pH值、染色温度、染料浓度以及盐对上染性能的影响。结果表明：靛蓝隐色酸能上染维纶,随着染料浓度的增加,纤维表面色深度也增加;在保险粉质量浓度为8 g/L、染浴pH值为4~5时,上染性能最好;温度对染料上染量有显著影响,在90~100℃时,染料上染达到最高峰,但超过110℃后,维纶发生明显软化收缩;盐对靛蓝隐色酸上染维纶有促染作用。

Indigo acid-leuco was used to dye vinylon in order to improve the color yield of vinylon. The dyeing method and dyeing parameters such as pH value of dye bath, dyeing temperature, concentration of dyestuff, sodium hydrosulfite and salt were investigated. The results showed that vinylon was successfully dyed with indigo acid-leuco. Dye uptake of vinylon was higher with increasing the concentration of dyestuff. Vinylon dyed at 90 - 100 ~C for 30 minutes at pH value 4 - 5 and sodium hydrosulfite 8 g/L featured higher color yield. Vinylon exhibited signifi cant softening and contraetion when dyeing temperature was above 110 ℃. Meanwhile salt had accelerating effect for dyeing vinylon with indigo acid-leuco.