What is the role of sodium sulfate?

Sometimes acid complex dyes need to be dyed with a pH below 4, so sodium sulfate can be used as a dye retardant. On the contrary, if the pH value of the dye bath medium is above 4, it is not suitable to use sodium sulfate because it will increase the tendency of dye aggregation, and non-ionic surfactants, such as Pingping O and emulsifier OP, should be used as dye retardants. . The dosage should be determined according to the color depth and dyeing equipment. Excessive dosage will make the wool felt and feel rough, which will affect the exhaustion of the dye in the dyeing liquor. The foam will increase on the liquid flow machine, which will affect the normal operation of the circulation exchange system; if the dosage is small, the effect will be poor.