Study on Cold Pad-Batch Dyeing of C.I.Reactive Blue 224
In order to reduce the energy consumption in the dyeing process,the cold pad-batch dyeing technique was used for C.I.Reactive Blue 224 to dye cotton fabric.The effects of alkali dosage and batching time on dye fixation in different mixed alkali sys-tems(sodium hydroxide and sodium carbonate mixed alkali system,and sodium hydroxide and sodium silicate mixed alkali system)in cold pad-batch process were investigated.The results showed that in the mixed alkali system of sodium hydroxide and sodium carbon-ate,when the amount of sodium hydroxide was 10 mL/L,the amount of sodium carbonate was 20 g/L and the batching time was 10 h,C.I.Reactive Blue 224 had the highest fixation of 91.6%on cotton fabric.In the mixed alkali system of sodium hydroxide and sodium silicate,the optimum condition was as follows:sodium hydroxide was 15 mL/L,sodium silicate was 30 mL/L and batching time was 12 h.At this condition,the fixation of C.I.Reactive Blue 224 on cotton fabric could reach 95.5%.
C.I.Reactive Blue 224cold pad-batch dyeingcotton fabricfixation
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