Optimization of dark dyeing poly(lactic acid) yarn with indigo dyes applied to denim fabric

Wu, Menglei; Chen, Yang; Peng, Peng; Zuo, Dunwen; Wang, Qian; Liu, Liu; Liao, Shiqin; Yi, Changhai

doi:10.1080/00405000.2022.2047320

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…7 (4) Various factors, such as temperature, acidity, and dye structure, could significantly influence the outcome of the staining process. 8,9 The staining of PLA could be carried out on fibers, yarns, or fabrics, but direct staining at the fiber stage was not a widely practiced method. 10 Presently, the primary method employed for coloring PLA materials is the utilization of disperse dyes.…”

Section: ■ Introductionmentioning

confidence: 99%

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Hydrophilic Modification of Polylactic Acid Fiber and the Usage of Natural Dye for Multi-Levered Improvement of the Fabric Staining Depth and the Stability Effect

Li,

Yang,

et al. 2024

Langmuir

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Polylactic acid (PLA) fiber is a degradable material with good environmental friendliness for textile applications. However, the main problems of difficult dyeing of PLA fibers were: high crystallinity to the adsorption of dyes, more ester and methyl groups producing non-hydrophilic problems, long chains making dyes difficult to penetrate, and producing a low dyeing rate. Here, we attempted to change the crystallinity of the PLA fiber to a lower degree from hydrophobic to hydrophilicity property variation, destroy the long chain structure to grant more staining sites, and improve the PLA fiber staining depth and the resilience dyeing effect with deep eutectic solvent (DES) treatment and natural dyes. We discovered that a controlled DES treatment process could make PLA fibers less crystallized, help amorphous areas form, and break up long chains, which lead to more dye sites. After DES treatment, the crystallinity decreased from 56.12 to 29.86%, and the instantaneous water contact angle decreased from 108.79 to 64.39°. The DES-treated PLA fabric exhibited a higher K/S value of 15.14 for natural dyes under specific conditions. The fabric, which had remarkable fastness characteristics and wash resistance, could endure frequent laundering and fulfill the demands of everyday use. Moreover, the fabric had good antimicrobial activity against Escherichia coli, Staphylococcus aureus, and Candida albicans and possessed a certain level of biocompatibility with fibroblasts. This DES treatment and natural dye combination method offered a new strategy for improving PLA fabric staining depth and color fastness, making it a promising option for low-carbon environmental protection in the textile industry.

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Section: ■ Introductionmentioning

confidence: 99%

“…(3) PLA exhibited a low melting point and was soluble in alkaline conditions, rendering it unsuitable for staining at elevated temperatures or under alkaline conditions . (4) Various factors, such as temperature, acidity, and dye structure, could significantly influence the outcome of the staining process. , …”

Section: Introductionmentioning

confidence: 99%

Hydrophilic Modification of Polylactic Acid Fiber and the Usage of Natural Dye for Multi-Levered Improvement of the Fabric Staining Depth and the Stability Effect

Li,

Yang,

et al. 2024

Langmuir

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“…As a symbol of a free lifestyle, denim fabric and clothing have consistently been beloved by global consumers, with an annual global production exceeding an astonishing 9 billion meters and a value exceeding 25 billion USD. − However, the production process of denim garments, particularly the dyeing stage, has caused significant environmental pollution. − This pollution is primarily due to the excessive use of indigo dyes and reducing agents, such as sodium dithionite (Na 2 S 2 O 4 ), during the dyeing process. Based on current industrial practices, the dyeing process for indigo denim fabric consumes approximately 2 t of the toxic and corrosive Na 2 S 2 O 4 per ton of fabric, with an estimated 60–70% of this amount being discharged into the environment .…”

Section: Introductionmentioning

confidence: 99%

Vat Dye Molecule–Proton Dual Adsorption Catalysis Based on Molybdenum Disulfide for Sustainable Textile Dyeing

Wang,

Luo,

Ding

et al. 2024

ACS Sustainable Chem. Eng.

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The annual global output of denim exceeds a staggering 9 billion meters, valued at over $25 billion. The conventional production relies on sodium dithionite for indigo dye reduction, a costly process that also generates environmentally harmful wastewater with sulfite and sulfate ions. Addressing these issues, we present an eco-friendly, cost-effective electrochemical reduction approach using a novel molybdenum disulfide (MoS2) molecule–proton dual adsorption system for the electrocatalytic hydrogenation (ECH) of indigo dye. This system facilitates a phase shift from 2H to 1T in MoS2 by intercalating organic amine cations, enhancing the coadsorption of active hydrogen and indigo molecules, thereby boosting the ECH activity. The dimethylamine-cation intercalated MoS2 electrode material (MoS2-DMA-CF) achieves over 95% dye reduction efficiency and more than 75% faradaic efficiency in ECH, surpassing traditional methods with a 25% increase in K/S value, improved color fastness, and less than 5% color variation after 10 cycles. Additionally, this method reduces energy consumption by 92.424% and dyeing costs by 90.416%, with the dyeing wastewater exhibiting excellent biodegradability, offering substantial environmental benefits. This innovative approach not only yields significant cost savings but is also highly scalable, providing a sustainable solution for denim fabrication.

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“…The blue color of textiles can be derived from different chemical structures depending on the fiber nature 7 from both natural 8,9 and synthetic sources, 10 and the interest is not only in dyeing but also in the discolouration. 11 Phycocyanin is a water-soluble accessory photosynthetic pigment.…”

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confidence: 99%

Wastewater effluents analysis from sustainable algae-based blue dyeing with phycocyanin

Moldovan

Bou-Belda

Franco

et al. 2022

Textile Research Journal

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Sustainability in the textile industry is a challenge with an imminent need to be tackled. One approach can be focused on replacing fossil-based dyes with renewable and less polluting alternatives. In this sense, this study focuses on validating the suitability of an innovative natural-based blue dye, phycocyanin, sourced from Spirulina platensis microalgae. The laboratory-based experimental approach envisages the exhaustion dyeing of pre-mordanted cotton and bleached wool with phycocyanin-rich extract, representing the sustainable blue dye. The color characterization of naturally blue-dyed fabrics was performed via CIE Lab coordinates, depth of color by color stregth valures ( K/S), values of dye exhaustion, and colorfastness to laundering and light. The results indicate suitable dyeability with the natural blue dye, with process improvements a possibility. The main environmental character of this process was analyzed from the dyeing effluent characterization perspective. Measurements of chemical oxygen demand, biochemical oxygen demand, and metal content were performed on effluents resulting from dyeing processes with variable parameters, to analyze the influence of mordant use, process temperature, time, and pH. Findings indicate that the application of optimum dyeing process conditions results in the lowest oxygen demand values, suitable for further wastewater reuse, according to international industrial effluent limitations. The biological fungi wastewater treatment resulted in the reduction of biochemical oxygen demand and chemical oxygen demand values by around 80%, comparable with the industrial process, validating the sustainable character of using algae-based phycocyanin in the bath exhaustion dyeing process.

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Optimization of dark dyeing poly(lactic acid) yarn with indigo dyes applied to denim fabric

Cited by 6 publications

References 5 publications

Hydrophilic Modification of Polylactic Acid Fiber and the Usage of Natural Dye for Multi-Levered Improvement of the Fabric Staining Depth and the Stability Effect

Hydrophilic Modification of Polylactic Acid Fiber and the Usage of Natural Dye for Multi-Levered Improvement of the Fabric Staining Depth and the Stability Effect

Vat Dye Molecule–Proton Dual Adsorption Catalysis Based on Molybdenum Disulfide for Sustainable Textile Dyeing

Wastewater effluents analysis from sustainable algae-based blue dyeing with phycocyanin

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