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An
investigation about the effect of oxazolidine on modified
valonia extract tanning
Altan Afsar* and Ozgur Sekeroglu
Department of Leather
Engineering,
Faculty of Engineering, Ege
University,
35100 Bornova, Izmir, Turkey
*Corresponding author. E-mail:
altan.afsar@ege.edu.tr.
Tel: +90 232 3884000/1413.
Fax: +90 2323425376
Accepted 9 September, 2008 |
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This study is aimed at combining the usage of valonia and
modified valonia extracts with oxazolidine to obtain an
increase in hydrothermal stability, and thus to develop
tanning efficiency and to produce leathers that have better
properties then the ones tanned with valonia extract only.
Natural and three modified valonia extracts and oxazolidine
were used as tanning materials. Skin samples were divided
into two groups. In group A, valonia extracts were used as
tanning materials and oxazolidine as retanning agent. Group
A was divided into 4 subgroups according to the used extract
type. Each subgroup was also separated into four lots
according to the oxazolidine percentages used. Group B;
where oxazolidine was used as pretanning while valonia
extracts as tanning agents, was divided into three subgroups
according of oxazolidine usage. Each subgroup had four lots
according to the used extracts. General means of Shrinkage
Temperatures (Ts) for natural extract, group A and B were
found as 65.66, 78.62 and 83.42oC, respectively,
indicating that the oxazolidine pretanning followed by
valonia retanning provides better tanning efficiency. On the
base of the unique experiment, 4% oxazolidine and 20% least
modified vegetable tannin
combination gave the best result.
Key words:
Leather, tanning, tannin, valonia, oxazolidine, vegetable,
shrinkage temperature. |
