媒染对天然染料染色性能的影响

为研究天然染料染色时金属离子的媒染机制,用钛、铁、铝、锌4种金属离子对棉织物进行前媒染,然后用天然染料——胭脂虫酸染色。研究结果表明:与无媒染染色织物相比,所用媒染剂种类不同,染色织物的上染率、色光、鲜艳度发生了不同程度的变化;媒染使染色织物获得了较好的牢度,同时力学性能有所变化。仪器分析显示:经4种金属离子媒染后的织物表面均被轻度腐蚀,经钛离子媒染后的织物表面可明显看到附着物;金属离子与纤维上配位基的配位反应主要发生在纤维的无定形区。

Effect of premordanting on dyeing properties of cotton fabrics dyed with natural dyes

To study the mordant dyeing mechanism with metallic ion mordant agents when dyeing is carried out with natural dyes,mordants containing metal ions such as titanium,iron,aluminum and zinc was applied onto the cotton fabric before it was dyed with natural dye — carminic acid.The dye-uptake,shade,and brightness of the dyed cotton fabric varied with different mordants and they exhibited certain changes when compared with non-premordanting counterpart.Mordant dyeing rendered the fabric better fastness and made the mechanical properties change;apparatus analysis showed that after mordanting with metallic ions,the surface of fabric is eroded slightly and the fixture can be seen apparently on the surface of fabric treated with Ti ion;the coordination reaction between metallic ions and coordination group on the fiber mainly acts on the amorphous area of fabric.