Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (09): 83-90.doi: 10.13475/j.fzxb.20180806008

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Scouring and bleaching of cotton fabric by low temperature near neutrality one-bath one-step process

ZHANG Yue1,2,3,4, HU Danling1,2, REN Jinna1,2, LI Qing1,2()   

  1. 1. School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan, Hubei 430200, China
    2. Hubei Key Laboratory of Biomass Fiber and Ecological Dyeing & Finishing, Wuhan Textile University, Wuhan, Hubei 430200, China
    3. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215123, China
    4. National Engineering Laboratory for Modern Silk, Soochow University, Suzhou, Jiangsu 215123, China
  • Received:2018-08-23 Revised:2019-05-03 Online:2019-09-15 Published:2019-09-23
  • Contact: LI Qing E-mail:2014020@wtu.edu.cn

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Abstract:

In order to achieve a short pretreatment utilizing bio-enzyme for cotton fabric, the low-temperature activated system based on sodium perborate/tetraethylenediamine (SPB/TAED) was established. At the same time, both cellulase and pectinase were added into SPB/TAED system. Influences of the type and dosage of bio-enzyme, dosage of SPB/TAED, process duration and temperature on whiteness index (WI) and capillary effect (CE) of the fabric were investigated by the variable-controlling method. It can be found that good compatibility exists between bio-scouring and SPB/TAED bleaching. An optimized process is obtained as follows: cellulase 1 g/L, pectinase 2 g/L, SPB 15 g/L, TAED 25 g/L, penetrating agent 1 g/L, duration of 60 min and temperature of 60 ℃. In comparison with the conventional process carried out at 95 ℃ using peroxide and strong alkali (pH 12-13), the optimized low-temperature process has an obvious advantage in saving energy. The WI, wettability and dyeability are similar for the fabrics pretreated by the low-temperature and conventional high-temperature process. The breaking force, however, treated by low-temperature process is higher, and the surface of such pretreated fabrics is smoother and cleaner.

Key words: cotton fabric, low-temperature bleaching, bio-scouring, bio-enzyme, one-step, pretreatment

CLC Number: 

  • TS192.5

Fig.1

Influence of enzyme type on whiteness index and capillary efficiency of cotton fabric"

Fig.2

Influence of mixed enzyme mass concentration on whiteness index and capillary efficiency of cotton fabric"

Fig.3

Oxidation bleaching mechanism of SPB/TAED activation system. (a)Reaction formula of generating H2O2 by SPB in water;(b)Activated reaction of TAED/H2O2 produced PAA in-situ; (c) Effect mechanism of PAA on colored impurities in cotton; (d) PAA was nucleophilic attacked by H2O2 to generate AA"

Fig.4

Influence of SPB mass concentration on whiteness index and capillary efficiency of cotton fabric"

Fig.5

Influence of TAED mass concentration on whiteness index and capillary efficiency of cotton fabric"

Fig.6

Influence of scouring and bleaching duration on whiteness index and capillary effect of cotton fabric"

Fig.7

Influence of scouring and bleaching temperature on whiteness index and capillary effect of cotton fabric"

Tab.1

Comparisons of fabric's WI and pH value, temperature and theoretical energy consumption of process"

工艺 白度/% pH值 温度/℃ ΔQ/kJ
练漂前 练漂后
A 81.91±0.17 9.18 5.87 60 6 318
B 82.97±1.60 13.05 12.81 95 13 689

Tab.2

Comparisons of moisture absorption and mechanical properties of fabric"

试样
编号		 毛效/cm 铺展时间/s 断裂强力/(N·mm-2)
经 纬
1 6.20±0.39 6.59±0.41 427.62 312.30
2 12.90±0.48 0.46±0.07 413.94 323.45
3 9.70±0.42 0.71±0.10 263.03 217.73

Tab.3

Comparisons of fabric's dyeability toward to reactive dye"

试样编号 E/% F/% C K/S值 h/(°) ΔE
1 52.76 7.05 35.82 2.93 209.68 5.92
2 70.17 28.77 38.79 2.72 216.72 0.52
3 66.71 26.31 38.61 2.64 217.35 -

Fig.8

Comparisons of micro morphology of fabric(×5 000). (a) Greige fabric; (b) Low-temperature treated fabric;(c) Conventional treated fabric"

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