Substitute alkali for dyeing of dark reactive dyes

The invention belongs to the technical field of dyeing and finishing, and particularly relates to substitute alkali for dyeing of dark reactive dyes. The substitute alkali is prepared from 10 to 15 weight percent of KOH, 30 to 45 weight percent of sodium metasilicate, 35 to 45 weight percent of K2CO3, 3 to 7 weight percent of EDTA and 3 to 7 weight percent of ethylenediamine. According to the substitute alkali, the defect that commercially available substitute alkali is insufficient in dyeing of dark reactive dyes such as red and black is made up for, the fixation rate of the substitute alkali to the red and black is 11%-15% higher than that of the commercially available substitute alkali and 2.43%-3.65% higher than that of sodium carbonate, and after dyeing, the wet rubbing fastness of the substitute alkali is 0.5 grade higher than that of the sodium carbonate, and the dry rubbing fastness is 1 grade higher than that of the sodium carbonate, so that the substitute alkali can replace the sodium carbonate to b