Articles - Leather Technology Magazine Nº77
Influence of auxiliary products in mimosa tanning
Eng. Mariana I. Lorenzo (1)
Eng. Juan Carlos Karachov (2)
Dr. Ramón Palop (2)
Dr. Pablo E. A. Rodríguez (1)
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Influence of auxiliary products in mimosa tanning
Work presented at the 3rd National Technical Symposium of the Tanning Industry,
Buenos Aires, November 2010
Eng. Mariana I. Lorenzo (1)
Eng. Juan Carlos Karachov (2)
Dr. Ramón Palop (2)
Dr. Pablo E. A. Rodríguez (1)
(1) CEPROCOR (Center for Excellence in Products and Processes of Córdoba),
Córdoba’s Ministry of Science and Technology
Santa María de Punilla (5164) Córdoba, Argentine Republic
(2) Tanning Laboratory, Units Sudamericana S.A.
Sta. M. Del Buen Ayre 362/4, Buenos Aires, Argentine Republic
ABSTRACT
Tanning and re-tanning with vegetal products, especially, mimosa, are processes used
widely to manufacture any type of articles.
This study assesses the influence of three types of products in the physical and
organoleptic characteristics of leather tanned and/or retanned with mimosa and
different amounts of these auxiliary products.
The first part involves tanning on pickel leather and at a small scale (pieces),
assessing the tanning capacity at different concentrations by assessing the contraction
temperature and shrinkage, the speed of penetration of the tanning agent, the fastness
to light and temperature, the tanning color, as well as the organoleptic properties
(degree of softness, thickness and firmness)
The second part involves the application of on pre-tanned leather and at higher scales
(flanks) with a specific formulation for leather goods, where only the use of mimosa
is compared with variables where the abovementioned auxiliary products are added.
Product N° 1 (salt of naphthalene sulfonic acid) increases the mimosa speed of
penetration, resulting in a better stratigraphical distribution. The leather is very soft,
with loose grain, suitable for drummed articles.
Product N° 2 (phenol polymer) does not provide any properties that may improve
tanning with mimosa only. Moreover, they are tough, loose grain leathers.
Product N° 3 (salt of diphenyl sulphona) increases contraction temperature,
significantly improving the speed of penetration. It results in firm and soft leathers,
with very clean and neat colors and regular and uniform thickness.
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