Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (11): 94-103.doi: 10.13475/j.fzxb.20220812110

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Hydrolysis and bonding properties of reactive dyes in non-aqueous medium with minimal water systems

SHAO Min, WANG Lijun, LI Meiqi, LIU Jinqiang, SHAO Jianzhong()   

  1. Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2022-08-29 Revised:2022-09-29 Online:2022-11-15 Published:2022-12-26
  • Contact: SHAO Jianzhong E-mail:jshao@zstu.edu.cn

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Abstract:

To ascertain the bonding properties of reactive dyes with alcohol hydroxyls on cotton fibers and the accompanying hydrolysis behavior of reactive dyes in non-aqueous medium with minimal water systems, the high performance liquid chromatography (HPLC) and the actual dyeing method were jointly used to study the hydrolysis characteristics of reactive dyes in the solution systems of non-aqueous medium with minimal water, the bonding properties of reactive dyes with alcohol hydroxyl groups in the simulated reaction system using methanol as the simulant of alcohol hydroxyl groups on cellulose fibers, and the dyeing performance of reactive dyes onto cotton fibers in actual non-aqueous medium dyeing system. The results show that, the hydrolysis properties of reactive dyes in the solution system of non-aqueous medium with minimal water mainly depend on the relative concentration of dyes to water, the pH value, and the temperature; the alcoholysis rate of reactive dyes in non-aqueous medium with minimal water system is significantly higher than that in the conventional water bath, and the increase in pH value increases the ratio of alcoholysis percentage to hydrolysis percentage, while the increase in temperature reduces the ratio significantly; the dyeing in non-aqueous medium with minimal water system can achieve ultra-high exhaustion rate of reactive dyes onto cotton in a wide range of pH value and temperature; and the dyeing process for cotton reactive dyeing in non-aqueous medium with minimal water system should adapt the strategy with a comparatively higher pH value and lower temperature, which is beneficial to the dyeing and fixing performance of reactive dyes, and thus beneficial to water-saving and carbon reduction production.

Key words: non-aqueous medium, reactive dye, cotton, hydrolysis, alcoholysis, bonding reaction, high performance liquid chromatography(HPLC)

CLC Number: 

  • TS193.1

Tab.1

Gradient leaching system of C.I. Reactive Red 24 & C.I. Reactive Blue 19"

C.I.活性红24 C.I.活性蓝19
时间/
min		 流动相
A/%		 流动相
B/%		 时间/
min		 流动相
A/%		 流动相
B/%
0 20 80 0 20 80
10 45 55 5 40 60
15 20 80 15 20 80

Fig.1

HPLC representative chromatograms of reactive dyes in various medium systems. (a)C.I. Reactive Red 24; (b) C.I. Reactive Blue 19"

Fig.2

Peak area percentage of Hydrolyzed reactive dyes vs hydrolysis time in various medium systems. (a)C.I. Reactive Red 24; (b) C.I. Reactive Blue 19"

Fig.3

Percentage of hydrolyzed reactive dyes in various medium systems under various hydrolysis conditions. (a)C.I. Reactive Red 24; (b)C.I. Reactive Blue 19"

Fig.4

Percentages of alcoholized dyes and hydrolyzed dyes of reactive dyes in various medium systems.(a)Alcoholized dyes of C.I. Reactive Red 24;(b)Hydrolyzed dyes of C.I. Reactive Red 24;(c)Alcoholized dyes of C.I. Reactive Blue 19;(d)Hydrolyzed dyes of C.I. Reactive Blue 19"

Fig.5

Schematic diagrams of simulated reaction systems.(a)Conventional water bath;(b)Non-aqueous medium with minimal system"

Fig.6

Percentages of alcoholyzed dyes in non-aqueous medium with minimal water system under various conditions.(a) D5 medium with minimal water; (b) LP medium with minimal water"

Tab.2

Percentages of the alcoholyzed dyes and hydrolyzed dyes in various medium systems at various pH value"

染料 pH值 常规水浴 D5-微水 LP-微水
Ra/% H2/% Ra:H2 Ra/% H2/% Ra:H2 Ra/% H2/% Ra:H2
C.I.
活性红24		 9 5.5 4.3 1.28 54.2 7.0 7.74 54.7 7.4 7.39
10 30.7 18.0 1.71 87.1 11.3 7.71 86.4 10.6 8.15
11 61.9 35.3 1.75 89.0 11.0 8.09 89.5 10.5 8.52
C.I.
活性蓝19		 9 18.4 23.7 0.78 86.9 10.7 8.12 82.6 10.3 8.02
10 38.8 45.6 0.85 89.8 10.2 8.80 89.5 10.5 8.52
11 50.3 49.7 1.01 92.7 7.3 12.70 92.9 7.1 13.08

Tab.3

Percentages of alcoholyzed dyes and hydrolyzed dyes in various medium systems at various temperature"

染料 温度/
℃		 常规水浴 D5-微水 LP-微水
Ra/% H2/% Ra:H2 Ra/% H2/% Ra:H2 Ra/% H2/% Ra:H2
C.I.
活性红24		 70 61.9 35.3 1.75 89.0 11.0 8.09 89.5 10.5 8.52
80 46.5 51.9 0.90 82.1 17.9 4.59 81.7 18.3 4.46
90 39.5 60.5 0.65 60.6 39.4 1.54 64.5 35.5 1.82
C.I.
活性蓝19		 60 55.6 40.8 1.36 93.7 6.3 14.87 94.1 5.9 15.95
70 50.3 49.7 1.01 92.7 7.3 12.70 92.9 7.1 13.08
80 39.8 60.2 0.66 89.8 10.2 8.80 89.5 10.5 8.52

Tab.4

Exhaustion and hydrolysis percentages of reactive dyes in various medium systems"

染料 染色条件 常规水浴染色体系 D5-微水染色体系 LP-微水染色体系
E/% Hr/% H/% E/% Hr/% H/% E/% Hr/% H/%
C.I.
活性红24		 70 ℃/pH=11 11.9 48.1 42.4 97.1 30.7 0.9 98.2 49.2 0.9
80 ℃/pH=11 33.2 96.6 64.6 98.3 93.5 1.6 98.1 94.1 1.8
90 ℃/pH=11 47.3 96.9 51.1 98.1 96.3 1.8 97.9 96.2 2.0
90 ℃/pH=10 26.1 71.7 53.0 98.1 90.5 1.7 97.6 91.4 2.2
C.I.
活性蓝19		 60 ℃/pH=11 74.6 60.7 15.4 98.8 46.3 0.6 98.7 48.5 0.6
60 ℃/pH=10 31.3 37.2 25.6 99.6 25.0 0.1 98.4 24.4 0.4
70 ℃/pH=10 60.7 81.0 31.8 98.8 62.4 0.8 99.8 59.1 0.1
80 ℃/pH=10 64.4 85.1 30.3 99.2 69.6 0.6 98.9 72.9 0.8

Fig.7

Comparison of the hydrolyzed dye percentages among solution system, methanol simulated reaction system, and cotton dyeing system with various medium systems. (a) C.I. Reactive Red 24 ; (b) C.I. Reactive Blue 19"

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