Abstract:

Aiming at the poor moisture absorption and water vapor permeability of microfiber synthetic leather, the filling material such as tannin extract and softening agent such as neats-foot oil were selected to the influences of modify microfiber synthetic leather base to improve the hydrophilic crosslinking properties. By experiment, some correlative factors such as the types and dosages of crosslinking agent, crosslinking time, crosslinking temperature and pH value on the properties of microfiber synthetic leather base were investigated. The result show that the moisture absorption of the base modified by crosslinking agent increased by 35.66%, the water vapor permeability increased by 53.23%, the mechanical properties are significantly improved, the thickening rate and weight gain rate of the base are very obvious, and the  modification does not affect its softness. The base before and after crosslinking were characterized by scanning electron microscopy, water contact angle, specific surface area, thermal analysis and x-ray diffraction analysis. The results indicated that the fiber loose degree increased significantly, the active group content and wettability of base increase, the specific surface area of the base increased and the fiber neat degree changes. Moreover, it increases the thermal stability of the bases.

Key words: crosslinking agent, microfiber synthetic leather base, modification, moisture absorption, water vapor permeability