真丝织物活性染料低盐无碱染色工艺研究

Research on Low-Salt and Alkali-Free Reactive Dyes Process for Silk Fabrics

采用色媒体对真丝织物进行改性,然后用活性染料进行低盐无碱染色。研究了色媒体用量、改性液pH值、改性温度和时间对改性织物染色K/S值的影响;测定了真丝织物改性前后在不同pH值下的Zeta电位;探究了改性真丝染色工艺中元明粉和纯碱用量对织物K/S值的影响。结果表明,色媒体改性真丝织物的较佳工艺为色媒体用量4g/L,改性处理液pH值7～8,温度70℃,改性时间40min;改性真丝纤维的Zeta电位负值有所降低,有利于活性染料上染;改性后的染色真丝织物可以降低常规盐用量的25%,实现低盐染色。

Color media are used to modify the silk fabric and then reactive dyes are adopted to carry out low-salt and alkali-free dye. This paper studies the influences of color media usage, pH value of modified liquid, modified temperature and time on K/S value of modified fabric dyeing; determines Zeta potential of silk fibers in different pH values before and after modification; explores the effect of anhydrous sodium sulphate and soda dosage on K/S value of the fabric in the dyeing process of the modified fabric. The results show that the optimal process conditions of silk fabric modified by color media are as follows： color media dosage 4g/L, pH value of modified liquid 7~8, temperature 70℃C, time 40 min. The negative value of Zeta potential of modified silk fibers reduces, beneficial to reactive dyeing. Modified silk fibers can reduce 25 %of conventional salt dosage during dyeing and realize low-salt dyeing.