Anhydrous dyeing processes of ramie fiber in liquid ammonia

Su, Siwei; Liu, Yonghong; Yin, Guoyi; Wang, Qiang; Cai, Yingjie; Peng, Xiongyi; Pervez, Md. Nahid; Lin, Lina

doi:10.1007/s10570-019-02630-7

Cited by 27 publications

(22 citation statements)

References 21 publications

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“…During the drying at 100 °C, the residual liquid ammonia was evaporated, and the vinyl sulfone sulfate was transferred to vinyl sulfone group. 33 Subsequently, some of the reactive dyes were chemically fixed with the ramie fiber by covalent bonding, 43 as shown in Fig. 4 .…”

Section: Resultsmentioning

confidence: 99%

“… 31 In addition, LA and a combination of LA and water were used to efficiently wash off the unfixed dye, to further decrease water consumption in the dyeing process. 32 In our next work, pretreatment to washing, the whole process was carried out in LA, 33 which revealed that the dichlorotriazinyl group in the reactive dye was unstable and changed to a monochlorotriazinyl group during LA dyeing, which was possibly due to moisture present in LA, while the vinyl sulfone and monochlorotriazinyl reactive group were stable. Moreover, after drying, part of the vinyl sulfone or monochlorotriazinyl reactive group of the dye reacted with the hydroxyl groups of cellulose, resulting in covalent bonding.…”

Section: Introductionmentioning

confidence: 93%

“…Other reactive dyes were hydrolyzed or did not change, i.e., they remained in their reactive form. 33 Thus, aer drying, the unxed dye washed off from the dyed ber cannot be reused for dyeing.…”

Section: Introductionmentioning

confidence: 99%

“…, they remained in their reactive form. 33 Thus, after drying, the unfixed dye washed off from the dyed fiber cannot be reused for dyeing.…”

Section: Introductionmentioning

confidence: 99%

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Sustainable dyeing of ramie fiber with ternary reactive dye mixtures in liquid ammonia

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

“…, they remained in their reactive form. 33 Thus, after drying, the unfixed dye washed off from the dyed fiber cannot be reused for dyeing.…”

Section: Introductionmentioning

confidence: 99%

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Sustainable dyeing of ramie fiber with ternary reactive dye mixtures in liquid ammonia

et al. 2022

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“…Mercerization pretreatment by caustic mercerization (CM) or liquid ammonia (LA) in the textile sector is often employed to improve several characteristics of cotton fabrics, including luster, tensile strength and dyeability [ 1 , 2 ]. In contrast with CM treatment, the advantage of LA treatment is cleaner because liquid ammonia is highly volatile and can be completely recycled after mercerization [ 3 , 4 , 5 ]. After CM treatment, the Na + ions inside the cotton fiber are hard to wash off, and it critically influences the dyeing performance without the efficient removal of Na + ions.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sequential Liquid Ammonia and Caustic Mercerization Pre-Treatment on Dyeing Performance of Knit Cotton Fabric

et al. 2022

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A two-stage sequential pretreatment including caustic mercerization (CM) and liquid ammonia (LA) treatment was applied to investigate the influence on dyeing performance and handle of knit cotton fabric, and the relationship between dye size and dyeing properties. Various techniques were applied to characterize all the treated fabrics. X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) analyses of the treated fabrics confirmed that both sequential treatments decreased the crystallinity of cotton fabric more than only the CM or LA treatment. The pattern of cellulose I was transferred to a mixed configuration of cellulose II and cellulose III after the CM/LA or LA/CM treatment. Thermal performances measured by thermogravimetric analysis (TGA) and differential thermogravimetry (DTG) techniques showed that the thermal stability of the treated cotton only marginally decreased. The wicking height increased after the sequential CM/LA treatment, indicating that the hydrophilicity of the fabric increased. The dye absorption and color uniformity were better for the reactive dye with a smaller molecular weight (Reactive Red 2) compared with the one with a larger molecular weight (Reactive Red 195). The total dye fixation efficiency (T%) increased to 72.93% and 73.24% for Reactive Red 2 dyeings of CM/LA- and LA/CM-cotton fabric from 46.75% of the untreated fabric, respectively; the T% increased to 65.33% and 72.27% for Reactive Red 195 dyeings of CM/LA- and LA/CM-cotton fabric from 35.17% of the untreated fabric, respectively. The colorfastness and dye exhaustion and fixation percentages of the samples were enhanced after the treatments. Furthermore, compared to the single CM or LA treatment, the softness handle properties were further improved after the fabrics were sequentially treated by CM/LA. The developed pre-treatment of CM/LA can be used in the textile industry to promote the dyeability, handle, and mechanical properties of knit cotton fabrics.

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Effluent-free deep dyeing of cotton fabric with cacao husk extracts using the Taguchi optimization method

et al. 2020

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Textile dyehouses are under scrutiny because they discharge colored and hazardous effluents to waterways. There is a need to develop an alternative dyeing system that does not produce any hazardous effluent. The waterless dyeing method could be a viable eco-friendly alternative to the traditional aqueous dyeing method. In this work, cacao husk extracts were used as a natural dye in the decamethylcyclopentasiloxane (D5) medium for the dyeing of cotton fabric, and subsequently, the dyed cotton was treated by a fixation treatment with a cationic dye-fixing agent in the D5 medium. The cotton fabric dyed with cacao husk extracts exhaustion in the waterless D5 medium exhibited better exhaustion, fixation rate, color strength (K/S), and colorfastness to washing and rubbing compared to the fabric dyed with the same extracts using the conventional aqueous dyeing and dye-fixing methods. The dye exhaustion percentage and the dye fixation rate were 95.6% and 94.8% in the D5 medium respectively, which is significantly higher in comparison to a 48.2% dye exhaustion percentage and a 35.3% dye fixation rate in the conventional water medium. An orthogonal array design (L9 ) was adopted to optimize the dyeing conditions with respect to exhaustion percentage. The results indicated that the dyebath temperature was the most important factor for achieving the optimal dye exhaustion, and dyeing time also showed considerable effects. Linear regression was used to predict the exhaustion percentage, and the resulting p value of 0.000 demonstrated that a strong coefficient was proven among all selected factors. This study has demonstrated that dyeing of cotton fabric with cacao husk extracts in the D5 dyeing system can be a viable method for the textile industry with minimal environmental pollution.

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Anhydrous dyeing processes of ramie fiber in liquid ammonia

Cited by 27 publications

References 21 publications

Sustainable dyeing of ramie fiber with ternary reactive dye mixtures in liquid ammonia

Sustainable dyeing of ramie fiber with ternary reactive dye mixtures in liquid ammonia

Influence of Sequential Liquid Ammonia and Caustic Mercerization Pre-Treatment on Dyeing Performance of Knit Cotton Fabric

Effluent-free deep dyeing of cotton fabric with cacao husk extracts using the Taguchi optimization method

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