本文關鍵詞：直接染料在水和液氨介質中上染苧麻纖維的染色性能研究　出處：《武漢紡織大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 液氨染色 苧麻纖維 直接染料

【摘要】：傳統(tǒng)印染技術存在環(huán)境污染大,廢水排放量大,且廢水里的有機物復雜,不容易清除的問題。本課題采用直接藍71和直接紅23染料在液氨介質中對苧麻散纖維進行染色性能研究,并與染料在水介質的染色性能進行對比,探究直接染料在液氨介質中對苧麻纖維的染色性能。在水介質染色中,在不同的染色溫度、染色時間、染料濃度和氯化鈉含量的條件下,考察染色條件對染料上染率、固色效率和耐水洗色牢度的影響;并對染色過程中的動力學和熱力學進行分析。實驗結果表明,氯化鈉能有效地提升直接染料對苧麻纖維的上染率和固色率,而對耐水洗色牢度無影響。隨著溫度的升高,染料達到吸附平衡時間越快。隨著濃度的增加,染料上染率和固色率呈現(xiàn)下降趨勢。在動力學方面,直接藍71和直接紅23上染苧麻纖維的過程符合準二級動力學模型,直接藍71在水中的半染時間比直接紅23在水中上染的半染時間長。在加鹽的染色條件下,染料的上染速率比無鹽染色的條件下快;且溫度越高,半染時間越短,擴散系數(shù)越大,上染速率越快,活化能越低。在熱力學方面,直接染料對苧麻纖維的染色過程符合Freundlich吸附模型。在液氨染色介質中,在不同的染色時間,染色溫度和染料濃度的條件下,考察染色條件對染料上染率、固色效率和耐水洗色牢度的影響,并對染色過程中的動力學和熱力學進行分析。實驗結果表明,直接染料對苧麻纖維的上染率,隨著染色時間的增加而增加,約在60s后達到染色平衡。染色溫度(-40℃到-60℃)對染料的上染率無明顯的影響。隨著染料濃度的增加,染料上染率逐漸下降。在固色率方面,隨著時間的增加而增加,然后在達到染色平衡后上下波動,染色溫度對固色率無明顯影響,而隨著濃度的增加而下降。苧麻纖維的耐水洗色牢度,隨著染色時間和染料濃度的增加而都呈現(xiàn)下降的趨勢。直接染料在液氨介質中對苧麻纖維的染色過程與水介質一致,符合準二級動力學模型和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，

本文編號：1387551