ALTERNATIVE LEATHER MANUFACTURING PROCESS -2. ASSESSING THE LEATHER’S ECO-FRIENDLINESS
Journal Title: Annals of the University of Oradea. Fascicle of Textiles, Leatherwork - Year 2018, Vol 0, Issue 2
Abstract
It is the aim of this paper to assess the eco-friendliness of a bovine leather, obtained by an improved process that consists in pretanning with an oligomer resin, followed by low-offer chrome tannage. Namely, the leather tendency to release the tanning chemical auxiliaries was tested. The following analyses were performed to quantify the auxiliaries from aqueous leather extracts: total dissolved solids, organic and inorganic soluble matter, UV-VIS spectroscopy, HPLC chromatography. Experimental data indicated high release rates of oligomer and resorcin from the pre-tanned leather, which proves the reversibility of the pretanning process. The release rates of the same compounds after trivalent chrome tanning and retanning was about 4 times lower. This is due to the supplementary complexation effect of the oligomer resin and resorcin upon the trivalent chrome. Pretanning with oligomer resin and resorcin determined the decrease of chrome salt consumption by 50 ÷ 60 % as compared with the conventional chrome tanning technology, and advanced exhaustion of spent floats. Low-offer chrome tanning preceded by pretanning can contribute to the obtaining of eco-friendly leather, mainly due to lower Cr(III) content of finished leather. Consequently, the occurrence in leather of hexavalent chrome Cr(VI), which is one of the most restrictive indicators for leather eco-friendliness, is mitigated.
Authors and Affiliations
Melinda PRUNEANU, Ingrid BUCIȘCANU, Vasilica MAIER, Iulia BĂLĂU-MÎNDRU
Keywords
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