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首页> 外文期刊>Cellulose >Sustainable dyeing of cotton fabric with reactive dye in silicone oil emulsion for improving dye uptake and reducing wastewater
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Sustainable dyeing of cotton fabric with reactive dye in silicone oil emulsion for improving dye uptake and reducing wastewater

机译：硅油乳液活性染料可持续染色棉纺织纺织纺织纺织品改善染料吸收及减少废水

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From sustainable chemistry and engineering perspectives, water and energy consumption are arguably the main issues in the textile industry. Thus, a silicone reverse emulsion dyeing system is developed to dye cellulosic textile with reactive dye. When the amount of dye is the same, the color depth of dyed cotton fiber is 13.82 and the fixation of dye is 87.76% in the silicone reverse emulsion dyeing system. In traditional water-based dyeing system, the color depth of dyed cotton fiber and the fixation of dye is only 9.31, 56.63% respectively. The silicone reverse emulsion dyeing technology does not consumes salts, but it can improve the dye fixation by 31.13%, and decreases the dye discharge by 72.41%. For the hydrolysis of bifunctional reactive dye, the main hydrolysis reaction is the individual hydrolysis of monochlorotriazine or vinyl sulfone at the prophase of hydrolysis. After 30 min, the additional beta-hydroxyethyl sulfone and hydroxyl triazine dye are hydrolyzed to dihydroxyl dye. To confirm the hydrolytic reaction energy of dye in different dyeing system, the optimization of molecular structure, the hydrolysis reaction gap and the distribution of electron density on the dye were investigated using density functional theory. The hydrolytic reaction energy gap of bifunctional reactive dye is higher in silicone reverse emulsion dyeing system than that in traditional aqueous dyeing system, resulting the hydrolysis of dye is difficult in silicone oil emulsion dyeing system. The electron density is distributed almost entirely on the carbon-carbon double bond and triazine group in the HOMO of the dye, resulting in the LUMO of dyes can attacked by HOMO of hydroxyl anion. These successful investigations of the dyeing performance and the hydrolysis mechanism of dye explain that reactive dye can keep a long reactivity to fiber and effectively reduce the number of washing times, which greatly reduces the discharge of dyeing waste water.
机译：从可持续化学和工程的角度来看，水和能源消耗可以说是纺织行业的主要问题。因此，开发了一种有机硅反乳液染色系统，用活性染料对纤维素织物进行染色。当染料用量相同时，在硅酮反乳液染色体系中，染色棉纤维的色深为13.82，染料固色率为87.76%。在传统的水性染色体系中，棉纤维的染色深度和染料的固色率分别只有9.31%和56.63%。有机硅反乳液染色技术不耗盐，但可提高固色率31.13%，降低染料排放量72.41%。对于双功能活性染料的水解，主要的水解反应是在水解前期单独水解一氯三嗪或乙烯基砜。30分钟后，额外的β-羟乙基砜和羟基三嗪染料水解为二羟基染料。为了确定染料在不同染色体系中的水解反应能，利用密度泛函理论对染料的分子结构优化、水解反应间隙和电子密度分布进行了研究。与传统的水性染色体系相比，双功能活性染料在有机硅反相乳液染色体系中的水解反应能隙较大，导致染料在硅油乳液染色体系中水解困难。电子密度几乎完全分布在染料HOMO中的碳-碳双键和三嗪基团上，导致染料的LUMO受到羟基阴离子HOMO的攻击。这些对染料染色性能和水解机理的成功研究说明，活性染料可以保持与纤维的长期反应性，有效减少洗涤次数，从而大大减少染色废水的排放。

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