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首页> 外文会议>88th Textile Institute world conference 2012 : Bridging innovation, research and enterprise >Sustainable Developments in Printing Cotton Fabric with Indigo
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Sustainable Developments in Printing Cotton Fabric with Indigo

机译：靛蓝印花棉织物的可持续发展

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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：靛蓝不溶于水和大多数染色溶剂。因此，其在纺织品着色中的使用是通过将碱还原成可溶性无色化合物然后施加该溶液然后进行氧化来实现的。在棉布上用靛蓝印花通常使用氢氧化钠（苛性钠）作为碱，使用亚硫酸氢钠（氢氧化物）作为还原剂。苛性钠带来废水处理问题。在印刷/填充过程中，Hydros通过与大气中的氧气反应而迅速失去效力。这会导致印刷浆料过早氧化，因此需要进行持续监控。此外，水合物的降解产物构成废水危害。因此，人们一直在寻求在化学稳定性和废水管理方面寻找更好的替代方案。在上述背景下，本研究使用二氧化硫脲（TUD）作为更稳定的还原剂，碳酸钠作为较温和的碱。已经评估了用天然和合成靛蓝对棉织物印花的效果。使用合成靛蓝获得的阴影比使用天然靛蓝获得的阴影深约20％。当使用苛性钠作为碱时，对于天然和合成靛蓝，蒸腾时间为60秒是理想的。但是，当使用碳酸钠时，天然和合成靛蓝的蒸煮时间分别为2分钟和6分钟，可获得最深的阴影。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等级。研究得出的结论是，可以使用对环境影响较小的化学物质在棉织物上印刷靛蓝。

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