| The denim has been a hundred years history, and it is popular to people. With the development of life, the variety of the denim gradually increased, and the production is also growing. Even, in denim fabric dyeing, the most common dye is indigo. The production of the denim must to go through many processes, such as dyeing, sizing, weaving and finishing. The color of the denim depends on the dyeing and the washing, but the dyeing process is the main factor to determine the color of the product. In the dyeing, indigo doesn’t dissolve to water, it need to be restored to soluble leuco, and be dye on to the fiber, then it be oxidized and fixed on the fiber, so as to achieve dyeing.From the auxiliaries and reducing agent in the process of indigo dyeing, the subject research the effect of the dyeing fabric. At50℃, indigo is restored60min, the concentration of the dye is5g/L,change the kind of the auxiliaries and the reducing agent, and pad the semi-bleached fabric of cotton at25℃,the bath ratio is1:50,drying,soaping and washing after75s which is oxidation, test the K/S value, the dyeing rate, the rubbing fastness and the strength of the fabric, analysis and research the results. And observe the dyeing uniformity of yarn by optical microscopy, analysis the stained fabric swatches by Raman spectroscopy, optimize and design the staining system by center synthesis experiments.The test results show that, when the DP as a penetrant, the dyeing depth of the fabric increased more than20%, and the color fastness and levelness improve significantly. When the reductant is hydrosulfite, the dyeing rate of the fabric is high, and the fabric has good rubbing fastness and the strength without loss more. When the concentration of the dye is5g/L,the concentration of the penetrants DP is0.97g/L,the concentration of the hydrosulfite is5.65g/L and the concentration of the sodium hydroxide is6.63g/L, the physical properties of the dyed fabric is the best. |
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