Olga Niculescu, Minodora Leca, Teodora Staicu, Marian Micutz, Zenovia Moldovan<br>Rheological Behaviour of Ecologic Pigment Pastes for Natural <br>Leather and Fur Finishing

Olga Niculescu, Minodora Leca, Teodora Staicu, Marian Micutz, Zenovia Moldovan
Rheological Behaviour of Ecologic Pigment Pastes for Natural
Leather and Fur Finishing

Abstract:

Physico-mechanical, technological, functional, and especially aesthetic properties depend to a great extent on the quality of pigment pastes used to generate the grain layer of semi-processed nappalan fur and leather. Cumulated properties give value of use and appearance to the manufactured products: footwear, clothing, handbags, etc. Environmental protection has required restrictions on the use of heavy metals salts (Cr, Cd, Pb, Co, Hg, Ni) in pigment pastes, of ethoxylated alkylphenols as stabilization agents, of formaldehyde as crosslinker for the usual protein binders or on other toxic crosslinking agents, resulting in new alternatives for the industry of auxiliary finishing materials. Pigment pastes were prepared using a polyacrylic binder, red and yellow iron oxide pigments, lauric alcohol ethoxylated with 7moles of ethylene oxide (100% biodegradable) as stabilizing agent and castor oil as plasticizer. Acrylic polymer substitutes the protein binders, which eliminates crosslinking with formaldehyde. Pigment pastes were characterized by stationary and dynamic rheological behaviour. They have type-dependent pseudoplastic behaviour of thixotropic type, which increase with pigment concentration for both pigments. The same behaviour was obtained for the elastic component of viscoelasticity. Pastes containing yellow iron pigment are more pseudoplastic and thixotropic than the corresponding ones containing red iron oxide. Keywords: ecological pigment pastes, polyacrylic binder, finishing of leather and fur, rheological behaviour

Issue: 2015, Volume 66, Issue 10

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