High Dye Fixation Pad-Steam Dyeing of Cotton Fabrics with Reactive Dyes Based on Hydrophobic Effect

ABSTRACT

To enhance the dye fixation of pad-steam dyeing with reactive dyes, we used five kinds of dyes and water–ethanol dyeing medium to investigate the hydrophobic effect in dyeing process. The results indicated that the higher the molecule weight per water soluble group, i.e. the stronger dye hydrophobicity, the higher the dye fixation rate. When dyed with hydrophobic dye, both the alkali and steaming time can be reduced to realize the saving of chemicals and energy. For the more hydrophobic C.I. Reactive Orange 16 (RO16), the appropriate sodium carbonate concentration is 20 g/L, which is 10 g/L lower than the 30 g/L of C.I. Reactive Violet 5 (RV5). Similarly, RO16 just needed 2 min of steaming time to obtain the maximum K/S value, while RV5 needed 3 min. Enhancing the hydrophobicity of dyeing medium can also increase the dye fixation rates and K/S values. The K/S values and fixation rates of fabrics dyed with RV5 increased up mostly by 31.2% and 14% via using ethanol instead of 32 vol.% water in dyeing medium, respectively. All the dyed fabrics exhibit good color fastness.

摘要

为了提高活性染料湿短蒸染色固色率，采用五种染料和水-乙醇染色介质对湿短蒸染色过程中的疏水作用进行了研究。结果表明，活性染料单位水溶性基团所承载的分子量越大，即染料疏水性越强，固色率越高。当疏水性强的活性染料染色时，碱和汽蒸时间都可以减少，从而节约化学品和降低能源消耗。对于疏水性更强的C.I.活性橙16(RO16)，合适的碳酸钠浓度为20g/L，比活性紫5(RV5)的30g/L降低10g/L。同样，RO16只需要2分钟的汽蒸时间即可获得最大K/S值，RV5则需要3分钟，提高染色介质的疏水性也可提高固色率和K/S值。在染色介质中使用乙醇代替32 vol.%水之后，RV5染色织物的K/S值和固色率分别提高了31.2%和14%。所有染色织物均具有良好的色牢度。

KEYWORDS:

• Cotton
• reactive dye
• hydrophobic effect
• pad-steam dyeing
• fixation rate
• K/S value

关键词:

• 棉
• 活性染料
• 疏水效应
• 湿短蒸染色
• 固定率
• K/S值

Additional information

Funding

This work is supported by (1) National Key Technology R&D Program:[Grant Number 2017YFB0309700]; (2) Key Technology R&D Program of Shandong Province:[Grant Number 2017CXGC1006].