直接染料在水和液氨介质中上染苎麻纤维的染色性能研究

发布时间：2018-01-06 10:44

  本文关键词：直接染料在水和液氨介质中上染苎麻纤维的染色性能研究　出处：《武汉纺织大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 液氨染色 苎麻纤维 直接染料

【摘要】：传统印染技术存在环境污染大,废水排放量大,且废水里的有机物复杂,不容易清除的问题。本课题采用直接蓝71和直接红23染料在液氨介质中对苎麻散纤维进行染色性能研究,并与染料在水介质的染色性能进行对比,探究直接染料在液氨介质中对苎麻纤维的染色性能。在水介质染色中,在不同的染色温度、染色时间、染料浓度和氯化钠含量的条件下,考察染色条件对染料上染率、固色效率和耐水洗色牢度的影响;并对染色过程中的动力学和热力学进行分析。实验结果表明,氯化钠能有效地提升直接染料对苎麻纤维的上染率和固色率,而对耐水洗色牢度无影响。随着温度的升高,染料达到吸附平衡时间越快。随着浓度的增加,染料上染率和固色率呈现下降趋势。在动力学方面,直接蓝71和直接红23上染苎麻纤维的过程符合准二级动力学模型,直接蓝71在水中的半染时间比直接红23在水中上染的半染时间长。在加盐的染色条件下,染料的上染速率比无盐染色的条件下快;且温度越高,半染时间越短,扩散系数越大,上染速率越快,活化能越低。在热力学方面,直接染料对苎麻纤维的染色过程符合Freundlich吸附模型。在液氨染色介质中,在不同的染色时间,染色温度和染料浓度的条件下,考察染色条件对染料上染率、固色效率和耐水洗色牢度的影响,并对染色过程中的动力学和热力学进行分析。实验结果表明,直接染料对苎麻纤维的上染率,随着染色时间的增加而增加,约在60s后达到染色平衡。染色温度(-40℃到-60℃)对染料的上染率无明显的影响。随着染料浓度的增加,染料上染率逐渐下降。在固色率方面,随着时间的增加而增加,然后在达到染色平衡后上下波动,染色温度对固色率无明显影响,而随着浓度的增加而下降。苎麻纤维的耐水洗色牢度,随着染色时间和染料浓度的增加而都呈现下降的趋势。直接染料在液氨介质中对苎麻纤维的染色过程与水介质一致,符合准二级动力学模型和Freundlich吸附模型。
[Abstract]:The traditional printing and dyeing technology has a large environmental pollution, a large amount of wastewater discharge, and the organic compounds in the wastewater are complex. In this paper, direct blue 71 and direct red 23 dyes were used to study the dyeing properties of Ramie fibers in liquid ammonia medium, and the dyeing properties of Ramie fibers were compared with those of dyes in water medium. To investigate the dyeing properties of direct dyes on Ramie fibers in liquid ammonia medium. In water medium dyeing, under the conditions of different dyeing temperature, dyeing time, dye concentration and sodium chloride content. The effects of dyeing conditions on dye uptake, fixation efficiency and washing fastness were investigated. The kinetics and thermodynamics of the dyeing process were analyzed. The experimental results showed that sodium chloride could effectively increase the dye uptake and fixation rate of the direct dyes on Ramie fibers. With the increase of temperature, the adsorption equilibrium time was faster. With the increase of concentration, dye uptake and fixation showed a downward trend. The process of dyeing Ramie fiber on direct blue 71 and direct red 23 was in accordance with the quasi-second-order kinetic model. The half dyeing time of direct blue 71 in water was longer than that of direct red 23 in water. The higher the temperature, the shorter the half-dyeing time, the bigger the diffusion coefficient, the faster the dyeing rate and the lower the activation energy. The dyeing process of direct dyes on Ramie fiber was in accordance with Freundlich adsorption model. In liquid ammonia dyeing medium, under different dyeing time, dyeing temperature and dye concentration. The effects of dyeing conditions on dye uptake, fixation efficiency and washing fastness were investigated. The kinetics and thermodynamics of dyeing process were analyzed. With the increase of dyeing time, the dyeing balance was reached after 60 s. The dyeing temperature from -40 鈩，

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