Research on dyeing process of stepwise vat dyes on meta-aramid
In order to expand the selection of dyes with high color fastness to light for meta-aramid as well as to improve its color depth and sunlight resistance after dyeing,vat dyes with high color fastness to light,which are commonly used for dyeing cellulosic fibres,were used to distributed dye meta-aramid yarns with environmentally friendly carriers.The changes of K/S value,color fastness,surface morphology,mechanical and thermal properties and crystallinity were test-ed to explore the dyeing process and performance of the vat dyes and the environmentally friendly carrier FD-C on the me-ta-aramid yarns.The results showed that when the dosage of vat blue ER is 3% (omf),the optimal dyeing process of vat dyes with carrier on meta-aramid is as follows:add 60 g/L carrier FD-C before dyeing,raise the temperature to 130℃ at a rate of 1℃/min and keep it at that temperature for 60 min,then cooling down to 40℃;add 20 g/L carrier FD-C again,raise the temperature to 70℃ at a rate of 1℃/min and keep it at that temperature for 20 min;finally,soap wash.The dye-ing effect of this process is the best.Compared with without carrier,the K/S value of dyed yarns was improved by 5.2,and the color fastness to light was improved by 2 grades.The dyed yarns still had excellent mechanical and thermal properties.
万方数据
维普
