Abstract
Tannic acid (TA) was modified by sulfanilic acid (SAA) using HRP catalysis in aqueous phase. The structure of modified TA was characterized by FTIR. The tanning properties of modified TA have been studied by the tanning test together with aluminum and chrome tannages. The tanning results show that the modified TA is suitable for use as pretannage and in combinaton with chrome and aluminum tannage. The shrink temperature (Ts) of leather tanned using 6% modified TA and 2% chrome tannage can reach to 92.0 oC by the modified TA and and chrome tannage by sequential step. The applied leather has merits of good uniformity, fullness, softness and fine grain. With this method, the dosage of chrome tannage is lessened and environment pollution is alleviated.
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