基于碱性蛋白酶与铁(Ⅱ)盐的还原染料上染棉织物

Dyeing of cotton with vat dyes using alkaline protease along with iron(Ⅱ)salt

比较研究了碱性蛋白酶和连二亚硫酸钠还原体系的不同染料上染棉织物,结果表明,大多数情况下,二者染浴效果和K/S值(表征染色强度)基本相当。个别染料在碱性蛋白酶体系中的染色强度比在连二亚硫酸钠体系中的染色强度更好,而另一些染料则相反。有染料和无染料两种情况下,连二亚硫酸钠体系还原浴仅稳定存在1 h,而碱性蛋白酶体系还原浴能稳定存在24 h。连二亚硫酸钠体系还原染色棉织物的色牢度很好。配制碱性蛋白酶与铁(Ⅱ)盐还原浴,可获得几乎与之相同的染浴特性,即棉织物的染色强度高,色牢度好。

Cotton dyed with vat dyes showed comparable dye bath potential and surface color strength(K/S)in both the hydrosulfite and alkaline protease based reduction systems except limited exceptions,ie.for few dyes,the dye strengths were very good and some were even better than those obtained in the hydrosulfite system,but for some dyes the result was the opposite.The stability of reduction baths in the presence and absence of dye showed fair stability for 1 hour in the hydrosulfite system and 24 hours in the alkaline protease system.The color fastness of dyed cotton was found to be very good.It is possible to formulate alkaline protease along with iron(Ⅱ)salt-based reduction baths to achieve almost the same dye bath features,namely high dye strength of cotton with very good color fastness.