The invention belongs to the technical field of a
natural dye dyeing method, and concretely relates to a method for little-water
dyeing of cotton fabric by
cochineal color. The method comprises the following steps: a) preparing finishing liquid: taking
chitosan, adding acetate acid gracial, stirring the materials to obtain the
chitosan diluted finishing liquid; b) cotton fabric treatment: immersing the cotton fabric according to bath ratio of 1:30 in the
chitosan finishing liquid, adding a cross-linking agent, employing two dipping and padding for treatment, placing the material under acid
neutralization environment, washing the material and
roasting the material to obtain the chitosan-modified cotton fabric; c) dye liquor preparation: dissolving the
cochineal color in an
mixed solution of an
organic solvent and water, stirring the materials to obtain the dye liquor; and d)
dyeing: placing the chitosan-modified cotton fabric according to bath ratio of 1: 30 in the dye liquor, washing the material, and
drying the material. By chitosan modification treatment of the cotton fabric, an
organic solvent system is employed for dyeing, dyeing waste
water discharge is reduced, water repellency of the cotton fabric is increased, and the degree of dyeing and the color fastness of the
cochineal color to the cotton fabric are increased.