Community Research and Development Information Service - CORDIS

Chemical stabilization of the hides using modified aldehydes, melammine and other cross-linking agents, other chemicals and neutral salts

Bovine hides are stabilized with different offers of neutral salts, such as anhydrous sodium sulphate with sulphuric acid to decrease the pH. The best result was obtained applying 8% of anhydrous sodium sulphate at pH 8.1/8.2. Also, sheepskins are stabilized with superneutral sodium silicate and low offer of chrome salt. In these trials, the best result was obtained applying 1.5% of chrome salt such as pre-treatment of skins, working at final pH of 3.7.
Besides bovine hides are stabilized with modified aldehydes. The best results are obtained by increasing the quantity of glutardialdehyde (0,5%) and contemporary the quantity of a fat dispersing agent (0,5%).
The stabilization by cross-linking agents is successful. The trials performed during the research have highlighted some aspects among witch we consider worth mentioning "a larger tearing resistance of the hides, 10-15% increase of the hides thickness, shaving from the mechanical operation free from CrIII and/or other heavy metals and therefore recyclable as a raw material in the fertiliser industry"

Reported by

Conceria INCAS SpA
56022 Castelfranco di Sotto
Pisa
Italy
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