Physico-Chemical Studies on the Skin and Leather of Marine Animals-XIV:Degeneration of the Vegetable Tanned Shark Leather due to HCl
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概要
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Degeneration of the vegetable tanned shark leather which occurs when treated by HC1 for the purpose of removing the placoid scales, an obstacle if remained on the leather has been studied along with other behaviors of the products, The results obtained are shown in Tables 1-5 and can be summarized as follows. (1) Treating the vegetable tanned leather of shark with concentrated HCl (about 10%) at 40-50°C. for 30 mins. did not always affect the appearance of the leather, while invariably decreased the hydrothermal shrinkage temperatuer (Ts) to some extent. The lowering of Ts varied depending on the conditions of tannage and HCl-treatment (Tables 1-3). (2) For removal of the placoid scales, NaCl is usually added to the HC1 solution at shark leather tanneries so as to increase stability of the leather. But, in the present work, the preventive action of NaCl on the lowering of Ts of the leather due to HCl was not observed. (3) When the leather was neutralized after treating with concentrated HCl and retanned for a short period, increases both in the Ts and in combined tannin of the leather were found rather remarkable.
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