The experimental principle of dyeing cotton fabric with B reactive dyes is that the morphological structure and chemical properties of cotton fiber and wool fiber are completely different, which brings some difficulties to the dyeing of these two fibers. Type B reactive dyes are reactive dyes for cotton. The research shows that they can also achieve satisfactory results when used in wool dyeing, but the dyeing process conditions are quite different. B reactive dyes are used to dye cotton fibers at pH 1 1 and 60℃, and wool fibers at acid and 95 ~ 100℃.
Cotton/wool fabric is dyed with B reactive dyes in one bath and two steps, which can be dyed first and then cotton in one bath, or dyed first and then cotton in one bath. According to experience, because the dyeing ability of wool is much stronger than that of cotton fiber, wool will absorb most of the dyes in the dyeing process, resulting in dark color of wool and light color of cotton.