Ziel
The possibility of using colloidal silicas of small size in the leathermaking process has been demonstrated. A new ecological white stabilized intermediate (WSI) for tanneries has been developed, obtained through new types of colloidal silicas with very small diameter (between 6 and 10 nm). Four molecules have given good results.
The main achievement at the end of the project was production at the industrial level of 4 stable colloidal silicas adapted to the WSI specifications.
The WSIs obtained with these molecules through the different processes developed in this research have allowed:
the selection of the mechanical operations before tanning, allowing the choice in quality and thickness and the best adapted tanning process;
one year preservation for the WSI;
development of 3 new direct tanning processes: direct velvet, direct white and direct chromium, based on WSI;
great quality improvements in the final leather produced;
drastic reduction of the chrome pollution to comply with new European regulations;
reduction of around 25% of the chemicals used;
reduction of the labour cost of around 30%;
the recycling of the wastes (nontoxic, since the colloidal silicas are food authorized) for the production of collagen hydrolysates for the food, pharmaceutical and cosmetics industries;
a general saving for the tannery fixed at a conservative 30% compared with the classic wet blue process.
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92080 Paris la Défense
Frankreich