Aqueous finishing with polyisocyanate cross-linked binders
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Due to increasingly stringent environmental legislation the leather industry has to produce eco-friendly articles. At the same time, it needs to manufacture fashionable and high-quality articles in order to increase competitiveness. As part of this, factories have to replace solvent-based products by water-based products in their finishing formualtions to reduce the level of volatile organic compounds. The addition of a cross-linker is required in most cases in order to obtain high performance aqueous finishes. The aim of the present work is to explore the cross-linking reaction between polyisocyanate and both acrylic binders and polyurethanes. A comparison of results shows that polyisocyanate presents a very fast reticulation [cross-linking] speed at room temperature and has a pot-life of only 4 hours. In order to obtain optimum fastness values, different amounts of polyisocyanate are required, the amounts depend on the type of leather used and on the physical characteristics of the binders employed.
CitationOllé, L. [et al.]. Aqueous finishing with polyisocyanate cross-linked binders. "Journal of the Society of Leather Technologists and Chemists", Novembre 2009, vol. 93, núm. 6, p. 222-228.