The invention relates to the field of fabric
dyeing, in particular to a
dyeing method for modified
polyimide fabrics. The method comprises the following steps that
polyimide fabrics are cleaned and dried; low-temperature
plasma is adopted for pretreatment; the
polyimide fabrics are quickly put in an
acrylic acid solution for a
grafting reaction, and the modified polyimide fabrics are obtained after washing and
drying; dispersed cationic dye is used for
dyeing, washing is conducted after dyeing, and then
drying is conducted. According to the method, cleaning is conducted firstly to wash away impurities, oil and the like on the surfaces of fibers, the low-temperature
plasma is used for roughening the surfaces of the polyimide fibers, total reflection of light is weakened, and
diffuse reflection of light is enhanced; besides, a polar group is introduced by initiating the
grafting reaction of
acrylic acid, cations on dye molecules can be in ionic bond combination with carboxyl, and therefore the problem that the polyimide fibers are hard to dye can be effectively solved. By the adoption of the dyeing method for the modified polyimide fabrics, the process is simple, and the fabrics obtained after dyeing are high in
color depth and good in color fastness.