Olga Niculescu,  Minodora Leca, Gheorghe Coara, Gabriela Macovescu, Ciprian Chelaru<br>Characterization of Coating  Aqueous Disperse Systems Used in Natural Leather Finishing

Olga Niculescu, Minodora Leca, Gheorghe Coara, Gabriela Macovescu, Ciprian Chelaru
Characterization of Coating Aqueous Disperse Systems Used in Natural Leather Finishing

Abstract:

In the composition of aqueous disperse systems for natural leather finishing, the following auxiliary materials are used: pigments, binders, dyes, waxes, preservatives, plasticizers, thickeners, fillers, penetrators, etc. Binders used in the composition of aqueous systems for natural leather finishing are of acrylic, polyurethane, protein and butadiene type and are applied in various finish layers (ground coat, starch) to obtain the desired finish. This paper presents the chemical and physico-mechanical characterization of disperse aqueous coating systems used in natural leather finishing, made by foreign and Romanian companies in order to establish optimal finishing technologies. New materials were tested for natural leather finishing, with the aim of replacing final nitrocellulose dressings with dressings based on acrylic aqueous dispersions, without toxic solvents and to replace protein binders from pigment pastes, which require crosslinking with formaldehyde (toxic), with acrylic binders. To assess the physico-chemical characteristics of coating aqueous dispersions and physico-mechanical characteristics of films obtained from different types of binders used as such or in mixtures in certain proportions, analytical methods were used. Keywords: leather finishing, pigments, acrylic binders, polyurethane binders, protein binders, nitrocellulose emulsions, epoxy resins

Issue: 2012, Volume 63, Issue 9

Pages:

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This article is published under the Creative Commons Attribution 4.0 International License

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