Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (04): 84-89.doi: 10.13475/j.fzxb.20210307907

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation and reduction-oxidation process of indigo dispersant

HE Yingting1,2, LI Min1,2, FU Shaohai1,2,3()   

  1. 1. Jiangsu Engineering Research Center for Digital Textile Inkjet Printing, Wuxi, Jiangsu 214122, China
    2. Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
    3. National Engineering Research Center for Dyeing and Finishing of Textiles, Taian, Shandong 271000, China
  • Received:2021-03-22 Revised:2021-12-03 Online:2022-04-15 Published:2022-04-20
  • Contact: FU Shaohai E-mail:shaohaifu@hotmail.com

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Abstract:

In view of the low color yield of indigo dyeings, the preparation process of indigo dispersant was improred. The effects of the type and dosage of dispersant on the dispersion stability and dyeing properties of indigo dispersant were investigated. The effects of dye particle size, reductant dosage, temperature and pH value on the indigo reduction rate were analyzed, and the effect of oxidation methods on color fastness of dyed fabrics was discussed. The experimental results show that the dyeing of indigo dispersion with 1.5% dispersant DM-1501 achieves K/S value of 11.92. Under the condition of 1 g/L sodium hydrosulfite, 80 ℃ of reduction temperature, pH value is 11, the absorbance of leuco indigo in the reduction solution reaches the maximum and the half-reduction time of indigo dispersant with particle size of about 280 nm is reduced to 0.2 min. The cotton fabric oxidized by air reach the dry rubbing color fastness of grade 4, wet rubbing color fastness of grade 3, which are better than the fabric oxidized by H2O2.

Key words: indigo dispersant, dispersing, reduction-oxidation process, color fastness, dyeing property, cotton fabric

CLC Number: 

  • TS193.5

Fig.1

SEM images of indigo before and after grinding. (a) Original indigo; (b) Indigo dispersion"

Tab.1

Effects of dispersant type on dispersion stability and dyeing properties of indigo dispersion"

分散剂 粒径/nm 结晶度/% 粒径变化率/% K/S值
种类 质量分数/% 储存 热稳定 离心
无 0 62.97 染料发生团聚沉淀 10.33
NNO 1.5 314.1 73.99 2.42 17.16 -5.53 11.56
DM-1501 1.5 282.1 75.11 8.36 7.90 -6.19 11.92
AD-4600/DM-1501 1.5 (1∶1) 283.2 66.26 48.52 48.41 -7.87 10.82
平平加O/DM-1501 1.5 (1∶1) 237.6 69.91 3.37 65.99 -38.07 11.20

Tab.2

Effect of dispersant dosage on dispersion stability and dyeing properties parameters of indigo dispersion"

DM-1501质量
分数/%		 粒径/nm Zeta电位/mV 结晶度/% 粒径变化率/% 黏度/(mPa·s) K/S值
储存 热稳定 离心
0.5 292.4 -44.9 68.89 10.20 2.99 -22.98 2.16 11.13
1.0 235.2 -43.9 66.48 7.33 8.67 -13.93 2.67 11.30
1.5 205.0 -43.9 69.76 5.30 7.87 -5.71 3.27 11.41
2.0 188.2 -43.6 67.62 5.16 8.52 -1.20 8.01 11.07
3.0 186.4 -44.3 64.39 3.28 4.53 -0.11 14.81 11.14

Fig.2

Effect of reductant dosage on absorbance of leuco indigo"

Fig.3

Effect of temperature on indigo half-reduction time"

Fig.4

Effect of pH value on indigo reduction. (a) Absorbance curve; (b) Indigo reducing solution"

Fig.5

Effect of particle size on indigo half-reduction time"

Tab.3

Effect of oxidation method on oxidation time, dyeing properties and color fastness of dyed cotton fabrics"

H2O2质量
分数/%		 氧化时
间/min		 a* b* C* K/S值 耐摩擦色牢度/级 耐皂洗色牢度/级 皂洗残液
吸光度
干 湿 棉沾色 变色
空气氧化 22.0 -1.75 -19.95 20.03 11.92 4 3 4~5 4~5 0.464
5 2.0 -0.09 -20.63 20.63 9.93 3~4 2~3 4~5 4~5 0.636
8 1.5 0.07 -20.04 20.05 10.78 3~4 2~3 4~5 4~5 0.643
10 <1.0 0.18 -20.34 20.34 11.08 3~4 2~3 4~5 4~5 0.662
15 <1.0 0.58 -19.93 19.94 11.13 3~4 2~3 4 4 0.689
20 <1.0 0.84 -19.78 19.80 11.43 3 2 4 4 0.690

Fig.6

Effects of oxidation method on apparent morphology of dyes on surface of dyed fabrics. (a) Undyed;(b) Air oxidation;(c) 5%H2O2 oxidation"

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