A Novel Approach for Lightfast Wet-white Leather Manufacture Based on Sulfone Syntan-aluminum Tanning Agent Combination Tannage

作者：Zhang, Long; Zhao, Xinyu; Wang, Chunhua^*; Lin, Wei^*

来源：Journal of the American Leather Chemists Association, 2018, 113(6): 192-197.

• SYSTEM
• SALTS
• POLYPHENOLS
• TECHNOLOGY
• MECHANISM
• ACID

Wet-white tanning as an eco-friendly leather-making process has been attracting considerable attention. Herein, we have investigated a novel combination tannage for lightfast wet-white leather based on sulfone syntan and aluminium tanning agent. By optimizing the technology, 10% sulfone syntan and 3% aluminum tanning agent at final pH 4.0 - 4.5 can raise the shrinkage temperature (T-s) of the wet-white leather to similar to 81 degrees C. The synergistic tanning mechanism of the two has been illustrated. As verified by Zeta potential measurements, the introduction of Al-3(+) into the sulfone syntan system led to the increase in the isoelectric point (IEP) of wet-white leather, which is favorable for the subsequent post-tanning process. Scanning electron microscope-Energy dispersive X-ray spectroscopy (SEM-EDX) results reveal that sulfone syntan and aluminum tanning agent can be evenly bound within the leather matrix and promote the formation of tightly woven networks of collagen fibers. The novel combination tanning approach not only improves light fastness and lighter shade, but also confers high physical and mechanical properties to the wet-white leather.

• 出版日期2018-6
• 单位四川大学