Preparation of a Fiber Modifier HBP-NH_2 and Its Application in Salt-free Dyeing of Silk Fabric with Reactive Dyes

In this study,hyperbranched poly amide-amine(HBP-NH2) polymers with different terminal groups were prepared to modify silk fiber for improving the dye uptake and color fastness of silk fabric dyed with salt-free reactive dye.Diethylenetriamine and methylacrylate were used as material to prepare HBP-NH2(0)~HBP-NH2(6) which had different amino end groups by changing reaction time(0~6 h) of the monomer.The results of Fourier transform infrared spectroscopic analysis and amino content determination showed that there are a lot of alkaline groups including amino and imino groups in HBP-NH2.Thermogravimetric analysis indicated that HBP-NH2 had good thermal stability.The prepared 7 kinds of HBP-NH2 were used for fiber modification of silk fabric respectively,and the modified silk fabric was then dyed with salt-free reactive dye.The results showed that the modified silk fabric had good dyeing property and the silk fabric modified by HBP-NH2(5) had higher K/S value and color fastness.Salt-free dyeing of silk fabric with reactive dye could be realized by using HBP-NH2 as fiber modifier.