Method for converting traditional bath ratio reactive dye dyeing prescription into small bath ratio reactive dye dyeing prescription

The invention relates to a method for converting a traditional bath ratio reactive dye dyeing prescription into a small bath ratio reactive dye dyeing prescription. The conversion method is as the following: a. keeping a required reactive dye total amount consistent with the reactive dye total amount required in an original traditional bath ratio reactive dye dyeing prescription; b. maintaining the lower limit value of a small bath ratio salt concentration at the salt concentration of the original traditional bath ratio, and maintaining the upper limit value of the small bath ratio salt concentration at a value obtained by multiplying the salt concentration of the original traditional bath ratio by a multiplying factor, which is a ratio of the original bath ratio to the current bath ratio; c. controlling the lower limit value of a small bath ratio soda ash concentration at the soda ash concentration of the original traditional bath ratio, and controlling the upper limit value of the small bath ratio soda ash concentration at a value obtained by multiplying the soda ash concentration of the original traditional bath ratio by a multiplying factor, which is a ratio of the original bath ratio to the current bath ratio; and d. during dyeing solution preparation, first adding a neutral salt into water for dissolving, and then adding the reactive dye into the brine solution for dissolution. The method can make the dyeing depth of a fabric dyed by the small bath ratio reactive dye in accord with the dyeing depth of a fabric dyed by the traditional bath ratio reactive dye, i.e. Delta E DE is less than or equal to 1. And the conversion method is simple and fast.