Abstract:

In order to slove the problems of low strength, easy deformation and poor recovery after deformation of the superfine fiber synthetic leather, taking the sea island fiber as the research object, the alkali-soluble polyester/polyamide 6 (COPET/PA6) sea island fiber was treated with NaOH and HCI solution to obtain the PA6 island component and lotrs-shaped hollow-core COPET sea component. Tensile properties, relaxation properties and creep properties of COPET/PA6 sea island fibers, PA6 island components and COPET sea components were measured and analyzed. The viscoelasticity was fitted exponentially. The relationship of tensile properties between components and sea island fiber was discussed. It is concluded that the tensile properties and the change trend of COPET/PA6 sea island fibers are substantially consistent with those of PA  island and accord wiht the mixing law. The COPET sea component possesses good anti-relaxation creep properties, while those of the PA6 island components are poor, which directly affect the relaxation resistance and creep resistance of the COPET/PA6 sea island fiber.

Key words: alkali-soluble bolyester/polyamide 6 sea island fiber, alkali reduction, acid reduction, relaxation property, creep property