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首页> 外文会议>Textile Institute world conference >Sustainable Developments in Printing Cotton Fabric with Indigo
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Sustainable Developments in Printing Cotton Fabric with Indigo

机译：用靛蓝印花棉面料可持续发展

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Indigo is insoluble in water and most dyeing solvents. Hence, its use in textile coloration is achieved by alkaline reduction to a soluble leuco-compound and then applying this solution followed by oxidation. Printing with indigo on cotton commonly employs sodium hydroxide (caustic soda) as the alkali and sodium hydrosulphite (hydros) as the reducing agent. Caustic soda poses effluent disposal problems. Hydros rapidly loses potency by reacting with atmospheric oxygen during the printing / padding process. This causes premature oxidation of print paste and necessitates constant monitoring. Further, the degradation products of hydros pose effluent hazards. Hence, there is a constant search to find better alternatives in terms of chemical stability and effluent management. In the above context, the present research used thiourea dioxide (TUD) as a more stable reducing agent and sodium carbonate as a milder alkali. The resulting effect on printing cotton fabric with both natural and synthetic indigo has been evaluated. The shades obtained using synthetic indigo were about 20% darker than those obtained using natural indigo. When caustic soda was used as the alkali, a steaming time of 60 seconds was found to be ideal, for both natural and synthetic indigo. However, when sodium carbonate was used darkest shades were obtained at steaming times of 2 and 6 minutes for natural and synthetic indigo respectively. The printed samples showed good colour fastness ratings when evaluated according to Australian standards. The study concludes that indigo can be printed on cotton fabric using chemicals with a lesser environmental impact.
机译：Indigo不溶于水和最染色的溶剂。因此，它在纺织着色中的用途是通过碱性还原到可溶性白胶化合物，然后施加该溶液，然后涂覆氧化。用靛蓝印刷棉花通常使用氢氧化钠（苛性钠）作为碱金属和钠硫酸钠（Hydros）作为还原剂。苛性钠造成污水处理问题。 Hydros在印刷/填充过程中与大气氧气反应迅速损失效力。这导致对印刷浆料的过早氧化，需要持续监测。此外，Hydros Pose流出物危害的降解产物。因此，在化学稳定性和流出物管理方面，存在持续的搜索来找到更好的替代方案。在上述背景下，本研究使用二氧化硫（Tud）作为更稳定的还原剂和碳酸钠作为较高的碱。已经评估了对具有天然和合成靛蓝的印刷棉织物的产生效果。使用合成靛蓝获得的色调比使用天然靛蓝获得的阴影约为20％。当使用苛性钠作为碱时，发现60秒的蒸汽时间是理想的，适用于天然和合成靛蓝。然而，当碳酸钠被使用时，在蒸汽时间为2和6分钟的天然和合成靛蓝中获得​​最暗的色调。当根据澳大利亚标准评估时，印刷样品显示出良好的色牢度额定值。该研究得出结论，靛蓝可以使用具有较小环境影响的化学品在棉质面料上印刷。

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