Synthesis of wet rubbing fastness improver and its application on cotton fabrics dyed with reactive dyes

A water soluble polyurethane-acrylate(PUA) hybrid emulsion were synthesized through macromonomer radical copolymerization to improve wet rubbing fastness of cotton fabrics dyed with reactive dyes.The effects of —COOH content on the particle size,viscosity,and appearance of the emulsion were discussed.The effect of the dosage of acrylate on the particle size of the emulsion was analyzed,the relasionship between the ratio of nNCO /nOH and mechanical behavior of emulsion film was investigated.ATR was used to characterize the structure of the product,and PUA was applied on the cotton fabrics dyed with reactive dye for improving their rubbing fastness.The results showed that the PUA emulsion film had good tensile strength and breaking elongation when the ratio of nNCO /nOH was 1.4%;The emulsion had well dispersibility when —COOH was 1.4%.The cotton fabrics treated with the PUA emulsion exhibited better wet rubbing fastness and soaping fastness.