Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (01): 89-95.doi: 10.13475/j.fzxb.20210909107

• Textile Engineering • Previous Articles     Next Articles

Study on low-carbon and energy-saving cold pad-batch bleaching treatment of cotton spunlaced nonwoven

SUN Ting1, ZHANG Ruquan1,2(), TANG Zijie1, TU Hu1,2, HU Min1,2   

  1. 1. College of Textile Science and Engineering, Wuhan Textile University, Wuhan, Hubei 430200, China
    2. Key Laboratory Base of New Textile Materials and Advanced Processing Technology,Wuhan Textile University, Wuhan, Hubei 430200, China
  • Received:2021-09-26 Revised:2021-11-02 Online:2022-01-15 Published:2022-01-28
  • Contact: ZHANG Ruquan E-mail:zhangruquan@wtu.edu.cn

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Abstract:

As a bid to achieve the carbon neutrality and carbon emission peak in the textile industry, the influence of weight loss, water absorption, whiteness, residual pH value and COD value ws investigated by analysing alkali oxygen concentration, cold pad-batch time, hydrogen peroxide activator concentration, different treatment methods, as well as the microstructure of cotton spunlaced nonwoven fabrics. The results showed that the production cycle of hydrogen peroxide activator cold pad-batch was 4 h shorter than that of alkali oxygen cold pad-batch, and in addition the temperature was 60 ℃ lower than high temperature alkali oxygen process and whiteness was only decreased by 0.41%. The COD value increased by only 104 mg/L, with both the residual pH value and foam height meeting the requirements. Cold pad-batch bleaching technique with the advantages of low carbon and energy saving demonstrated great potential for replacing the high-temperature alkaline oxygen treatment process.

Key words: cotton spunlaced nonwoven, degreasing and bleaching, cold pad-batch, green and low-carbon, hydrogen peroxide activator

CLC Number: 

  • TS174.8

Tab.1

Sample parameter for each category"

样品编号 处理方式 质量浓度配比 处理条件
A1 未脱漂 — —
A2 高温碱氧 4:6:2:0:0 90 ℃,1 h
A3 碱氧冷堆 4:6:2:0:0 30 ℃,12 h
A4 复合酶冷堆 0:0:2:0:5 30 ℃,8 h
A5 双氧水活性冷堆 4:6:2:2:0 30 ℃,8 h

Fig.1

SEM images of cotton spunlaced nonwoven"

Fig.2

FT-IR spectra of cotton spunlaced nonwoven"

Fig.3

Effect of various factors on weight loss rate and water absorption. (a) NaOH and H2O2 concentrations at high temperatures; (b) Alkaline oxygen with cold pad-batch treatment time; (c) Hydrogen peroxide activator with cold pad-batch treatment time; (d) Sample type"

Fig.4

Various factors on whiteness. (a) Alkaline oxygen with cold pad-batch treatment time; (b) Concentration ratio of TAED and H2O2; (c) Hydrogen peroxide activator with cold pad-batch treatment time; (d) Sample type"

Tab.2

Comparison table of energy saving and emission reduction effect and sample performance under each category"

样品
编号		 COD值/
(mg·L-1)		 残余液
pH值		 泡沫高
度/mm		 残余双氧
水含量/
(mg·L-1)		 透气率/
(mm·s-1)		 强力/
N		 断裂伸
长率/%
A1 — — — — 2 517 27.5 49.9
A2 2 540 9.11 6 2.04 2 869 21.1 59.1
A3 2 235 7.54 0.8 1.36 2 778 22.9 57.7
A4 853 7.3 1 0 2 808 18.2 68.1
A5 2 644 7.32 1.6 3.4 2 726 19.7 64.9

Tab.3

Effect table of energy saving and emission reduction under each process parameter"

质量浓度/(g·L-1) 处理时
间/h		 残余液
pH值		 泡沫高
度/mm		 残余双氧水质量
浓度/(mg·L-1)
NaOH H2O2
4 6 8 7.32 2.0 2.04
6 6 8 8.23 0.8 2.38
4 6 12 7.31 1.6 1.70
6 6 12 8.04 0.5 1.70
4 8 8 7.15 0.4 1.02
4 8 12 7 2.0 1.36

Fig.5

Various factors on residual pH value and hydrogen peroxide content. (a) Concentration ratio of TAED and H2O2; (b) Hydrogen peroxide activator with cold pad-batch treatment time"

Fig.6

Radar maps of various categories"

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