The Synthesis And Application Of Cationic Polymer(PDA) On Fibers Modification

Due to pigment particles have no affinity for fibers, the pigment dyeing of fibers selective problem does not exist and applicability to all spices. Pigment dyeing has several noticeable advantages compared to dyestuffs. These advantages are a short process simple operation, reduce energy consumption and low costs, and while matching intuitive easy color imitation; steady color hue, hiding power. However pigment particles do not dissolve in water, it can not be a single-state elements within the infiltration of fiber, lack of shade directly to fibers.In this paper, the cationic polymerization–modifier was prepared from AM with DMC by means of radical polymerization. Using PDA charge to the goods will give the cotton substantively for the pigment to enhance the uptake of pigment and color strength. The effects of monomer concentration, initiator concentration, reaction time, reaction temperature were studied. In addition, the polymer molecular structure was confirmed by the infrared absorption spectrum. The thermal stability was studied by thermogravimetry then determines the application temperature range. At last, knitted cotton fabrics were dyeing with pigment, the key factors including the concentration of cationic reactant, pH values, as well as temperature and time, which affect the cutinized degree of cotton were discussed by measure uptake of pigment and the color strength (K/S value).The optimum application conditions of PDA were acquired:6% (o.w.f) of PDA, at pH 9~10, at 60℃for 20 min, and then use 1% (o.w.f) of pigment to dye cotton fabric. It was found that the uptake of pigment and the color strength (K/S) reached to the maximum. In addition, when monomer mole ratio (AC / DTC) is 2:8, and the initiator of a mole ammonium sulfate concentration of 0.5×10-2 mol·L-1, at 80℃for three hours. A cationic polyacrylamide with high molecular weight and good effect on cotton fabric modified polymer were prepared.The application of PDA on fibers for cationic modification application open up a new direction, reduce the production cost, reduce dyeing temperature, shorten the dyeing process, saving energy, improving production efficiency.