Olga Niculescu, Minodora Leca, Teodora Staicu, Zenovia Moldovan, Ciprian Chelaru, Daniela Mariana Berechet<br>Obtaining  and Characterization of Some Ecologic Pigment Pastes <br>for Finishing Natural Leathers and Furs

Olga Niculescu, Minodora Leca, Teodora Staicu, Zenovia Moldovan, Ciprian Chelaru, Daniela Mariana Berechet
Obtaining and Characterization of Some Ecologic Pigment Pastes
for Finishing Natural Leathers and Furs

Abstract:

The quality of pigment pastes used in the production of finishing films for semi-processed leather and fur influences some of the physico-mechanical, technological, aesthetic and ecological properties which provide finished products with use value and commercial aspect. Prohibitions on the use of salts of heavy metals, ethoxylated alkyl phenols, formaldehyde and other toxic crosslinking agents in pigment pastes have raised concerns for finding alternatives for the industry of finishing ancillaries. Pigment pastes were obtained based on black iron oxide, polymeric binder, lauryl alcohol ethoxylated with 7 moles of ethylene oxide (biodegradable), waxes and plasticizers for finishing natural nappalan leather and fur. The acrylic polymer replaces protein binders used in the compositions of pigment pastes, thus eliminating cross-linking with formaldehyde, which is toxic. Pigment pastes obtained were characterized by physical-chemical, microscopic, spectral and rheological analyses. They have the appearance of viscous and homogeneous fluids, exhibiting stability over time and characteristics of concentrated paste. FT-IR spectrum shows characteristic bands of the acrylic binder used. Studied pigment pastes have a more or less pronounced pseudoplastic behaviour; under the action of shear stress they reduce their viscosity, and have weak thixotropy. Pigment pastes were used in combination with film forming polymers (acrylic and polyurethane) for natural nappalan leather and fur finishing. Keywords: inorganic pigments, acrylic polymer, leather and fur finishing, rheology

Issue: 2015, Volume 66, Issue 9

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