阳离子田菁胶助染剂对纸浆纤维染色效果的影响

Effect of Cationic Sesbania Gum Dyeing Assistance on Pulp Fiber Dyeing

关键词:  阳离子田菁胶  助染剂  浆内染色  染色效果

Key Words:cationic sesbania gum  dyeing assistance  in-pulp dyeing  dyeing effect

摘要:为实现无盐染色，本实验引入阳离子田菁胶作为助染剂，通过增强染料与纸浆纤维间的吸附作用，经济环保地提高了浆内染色效果。结果表明，阳离子田菁胶作为直接耐晒翠兰（GL）染料的助染剂效果良好。光学显微镜与扫描电子显微镜观察表明GL染料、纸浆纤维、阳离子田菁胶结合紧密。通过单因素实验探究阳离子田菁胶用量、染色温度、染液pH值对纸浆纤维染色效果的影响，确定了最佳助染工艺条件为：阳离子田菁胶用量0.2%，染色温度45 ℃，染液pH值3，该条件下上染率可达92.6%。建立染色吸附动力学模型和染色吸附等温线可知，染色时间对染色效果影响较小，适当提高染液初始浓度可有效提高染色效果。

Abstract:To achieve salt-free dyeing， this study introduced cationic sesbania gum as a dyeing assistance to improve the in-pulp dyeing effect by enhancing the adsorption between the dye and pulp fibers. The results showed that cationic sesbania gum was effective as a dyeing assistance for GL dye. Optical microscopy and SEM showed that the GL dye， pulp fibers， and cationic sesbania gum were tightly bound. The effect of pH value， temperature， and cationic sesbania gum dosage on the dyeing effect of pulp fibers was investigated by single-factor experiments， and the optimal dyeing conditions were determined as follows： cationic sesbania gum dosage 0.2%， pH value of dyeing solution 3， dyeing temperature 45 ℃， and the dye uptake reached 92.6% under this condition. The dyeing adsorption kinetic model and dyeing adsorption isotherm were established， showing that the dyeing time had negligible effect on dyeing effect， which could be effectively improved by appropriately increasing the initial concentration of dyeing solution.