Salt free dyeing of HBP-HTC modified cotton fabric with reactive dyestuffs

In order to achieve salt-free dyeing with reactive dyes,a self-made quaternary ammonium salt of amino-terminated hyperbranched polymer(HBP-HTC)was applied to modify cotton fabric.The influencing factors,such as the molar concentration of the quaternary ammonium salts of the HBP-HTC,the concentration of the HBP-HTC aqueous solution,treating temperature and time were discussed.As a result,the optimum processing conditions were defined as follows:4 g/L HBP-HTC aqueous solution prepared with feed weight ratio m(EPTAC)∶m(HBP-NH2)=2∶1 for 30 minutes at room temperature,and then rinsed with tap water.The modified dyeings had similar K/S value and fastness compared to those of the conventional dyeings,even no salt was added to the dye bath in modified fabric dyeing.