阳离子田菁胶助染剂对纸张浆外染色效果的影响

Effect of Cationic Sesbania Gum as Dyeing Aid on Paper Dyeing

本研究通过醚化反应制备了阳离子田菁胶(CSG)助染剂,并通过浆外浸渍染色法,探究了其对直接耐晒翠蓝GL染色效果的影响,并确定了最佳染色工艺。适度提高醚化剂用量,能获得更高取代度的CSG;CSG的热稳定性比未改性田菁胶(SG)较差。加入CSG后,染料分子和CSG可通过静电吸附作用,稳固地附着在纸张表面,染色效果显著。选用取代度0.22、N含量0.63%的CSG作为助染剂,染色时间30 s、染液pH值6、CSG用量0.8%、染液温度70℃时,CSG染色效果最佳,相比SG组染色效果提升168.9%。染纸水洗前后Δb^(*)值变化不大,说明CSG同时具有较好的固色效果。

This study involved the preparation of cationic sesbania gelatin(CSG)as dyeing aid using an etherification reaction and investigated its impact on the direct sunfast azure blue GL dyeing performance through the method of pad dyeing,subsequently determined the optimum dyeing process conditions.A moderate increase in the amount of etherifying agent led to higher substitution degrees of CSG,albeit its thermal stability was found to be inferior to unmodified sesbania gelatin(SG).Upon the introduction of CSG,dye molecules and CSG were able to effectively adhere to the paper surface through electrostatic adsorption,resulting in a significantly improved dyeing effect.CSG with a substitution degree of 0.22 and N content of 0.63%was chosen as the dyeing aid,with the optimum dyeing conditions being a dyeing time of 30 s,a solution pH value of 6,a CSG dosage of 0.8%,and a dyeing temperature of 70℃.This yielded a 168.9%improvement in dyeing performance compared to the SG group.TheΔb^(*)value exhibited minimal changes before and after water washing of the dyed paper,indicating that CSG simultaneously exhibited excellent color fastness properties.