Mechanism of heat transfer printing of cotton fabric

In order to realize the heat transfer printing of cotton fabric,the idea of″bridge-linking″was put forward and a bridge-linking agent named FY-1 was prepared.The feasibility of bridge theory was proved by the example: heat transfer printing was performed on the cotton fabric which had been pretreated by FY-1,with C.I.disperse red 60.The bridge mechanism was analyzed by using physical methods such as optical microscope,transmission electron microscope.It seems there are three steps in heat transfer printing of cotton fabric: the bridge-linking agent enters into the fiber by the affinity and penetrating power,distributing dye-sites for disperse dye in the micropore;the bridge-linking agent can swell fiber at heat transfer printing temperature with the help of its thermo-swellability;disperse dyes sublimate at heat transfer printing temperature and dye on fiber through the force between molecules.