摘要：Taking waterborne-polyurethane (WPU) with high solid content as resin slurry, ecological synthetic leather base with good air permeability was prepared through the foaming process. The microstructure of the foaming base was characterized by the scanning electronic microscopy (SEM) and analyzed by the Image pro Plus software. The effects of dosages of foaming agents on the structure and properties of ecological synthetic leather base foaming film were studied. Azodicarbonamide (AC), a widely used agent with a highly foaming efficiency but insoluble in aqueous emulsion solution, was emulsified to perform as a valid foaming-agent. Dosage effect of such the agent on structure and mechanical properties of the foaming film in ecological synthetic leather base etc were studied. Results indicated that, by adding 0.3 % of AC (total weight of polyurethane) with foaming auxiliary: Urea [Urea/AC = 1:1 (w/w)], the optimized foaming film with uniform micro-pores can be worked out, which may improve the gas permeability of synthetic leather with excellently tensile strength. In addition, accompanied by the 0.3% AC, the value of specific surface area on the foamed film may increase to 1.0938m~2・g~(-1), which was about 33 to 34 times of those without adding the AC. This was also corroborated with observations by means of the scanning electron microscopy (SEM).
关键词：Waterborne-polyurethane;ecological synthetic leather;emulsification;the foaming film;the gas permeability
