Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (04): 101-106.doi: 10.13475/j.fzxb.20200807106

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Optimization and mechanism of hydrogen peroxide/ammonium persulfate bleaching for yak wool

PAN Jiajun1, XIA Zhaopeng1,2, ZHANG Haibao3, LU Yang3, ZHAO Jilin3, WANG Xuenong3, WANG Liang1, LIU Yong1()   

  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
    2. Shandong Institute for Product Quality Inspection, Ji'nan, Shandong 250102, China
    3. Qinghai Fiber Inspection Bureau, Xining, Qinghai 810001, China
  • Received:2020-08-17 Revised:2020-12-15 Online:2021-04-15 Published:2021-04-20
  • Contact: LIU Yong E-mail:liuyong@tiangong.edu.cn

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Abstract:

A novel decolorization process for yak wool with hydrogen peroxide/ammonium persulfate system was proposed to reduce the long decolorization time and shorten the commercial treatment process line. In order to improve fiber whiteness and minimize fiber damage, the effect of the decolorization time, ammonium persulfate dosage and pH value on yak wool in this process were discussed and compared with the commercial decolored yak wool via single-factor tests. The results show that with the decolorization time being 180 min at room temperature, the dosage of ammonium persulfate 400 g/L and pH value 9, and the decolorizing time 1/8 of that of commercial process, the yak wool bleached using this scheme has almost the same quality as that bleached using the commercial process. The bleaching mechanism is analyzed and found that the sulfate radical and the hydroxyl radical in this process played the main and secondary roles, receptively. This bleaching process is easier, providing a new solution for the high value utilization of yak wool.

Key words: yak wool, bleaching process, bleaching mechanism, hydrogen peroxide/ammonium persulfate

CLC Number: 

  • TS192.5

Fig.1

Whiteness of yak wool at different pH values"

Tab.1

Fracture strength of yak wool at different pH values"

pH值 直径/μm 线密度/dtex 断裂强力/cN 断裂强度/
(cN·dtex-1)
8 17.24 3.08 6.45 2.09
9 17.94 3.34 6.23 1.87
10 18.55 3.57 4.73 1.32

Fig.2

Morphology of yak wool scales at different pH values. (a) Unbleached; (b) pH=8; (c) pH=9; (d) pH=10"

Fig.3

Whiteness of yak wool at different mass concentration of ammonium persulfate"

Tab.2

Fracture strength of yak wool at different mass concentration of ammonium persulfate"

过硫酸铵质量
浓度/(g·L-1)		 直径/μm 线密度/dtex 断裂强力/
cN		 断裂强度/
(cN·dtex-1)
300 17.47 3.17 6.28 1.98
350 18.09 3.39 6.46 1.91
400 18.85 3.69 6.84 1.85

Fig.4

Morphology of yak wool scales at different mass concentration of ammonium persulfate. (a) Unbleached; (b) 300 g/L; (c) 350 g/L; (d) 400 g/L"

Fig.5

Whiteness of yak wool at different decolorization time"

Tab.3

Fracture strength of yak wool at different decolorization time"

脱色时间/
min		 直径/μm 线密度/dtex 断裂强力/
cN		 断裂强度/
(cN·dtex-1)
180 18.15 3.42 6.82 1.99
210 17.77 3.28 6.48 1.97
240 18.06 3.38 6.06 1.79

Fig.6

Morphology of yak wool scales at different decolorization time. (a) Unbleached; (b) 180 min; (c) 210 min; (d) 240 min"

Fig.7

Whiteness of yak wool treated with different bleaching reagent"

Tab.4

Comparison of parameters between this process and commercial decolorized yak wool"

脱色工艺 白度/% 断裂强度/
(cN·dtex-1)		 脱色时间/h
本文脱色工艺 73.45 1.87 3
商业化脱色工艺 78.89 1.82 24

Fig.8

Morphology of yak wool scales decolorized by commercial decolorization proces (a) and process of thispaper (b)"

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