Abstract:

In order to reveal the regularity of UV-absorbers taken up to PET fibers, three benzotriazole type UV-absorbers (UV-A1, UV-A2 and UV-A3) were dyed onto PET fabrics with high temperature and high pressure dyeing process. The uptakes of three UV-absorbers were determined through extraction with DMF. The thermodynamics and kinetics parameters of the three UV-absorbers were measured and calculated. Through comparison of their thermodynamics and kinetics parameters, it was found that UV- A1 with simpler molecular structure and smaller molecular volume had greater equilibrium adsorption, higher dyeing rate and diffusion coefficient, shorter time of half dyeing when compared with UV- A2 and UV- A3. It is implied that UV- A1 was much easier to take up and penetrate into PET fibers, had better affinity to the fiber, greateer heat and entropy change during dyeing and a stronger trend of leaving for the PET fibers from the dyeing bath.