Evaluation Of Tannin From Rhizophora Apiculata As Rust Converter
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Date
2005-03
Authors
Santoso, Henny Simulo
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Abstract
The main objective of this research is to formulate rust c9nverter formulations based
on tannin and to evaluate their rust conversion performance. The tannins that were
used in this study were extracted from mangrove (Rhizophora apiculata) barks which
are the waste product from charcoal industry. The extraction of mangrove bark with
70 % aqueous acetone produced 23.6 % mixed tannin, which contained 12.3 %
hydrolysable tannin and 8.7 % condensed tannin. The quantifications of tannin have
been carried out by several assays, such as Prussian blue assay for total phenolic
determination; vanillin assay to estimate condensed tannin, Stiasny test to provide the
estimation of the total flavanoid that react with formaldehyde. The identification of
the tannin monomer of condensed tannin was carried out by reverse phase HPLC.
Treatment of rust powder with various percentage of tannin solution resulted in the
transformation of iron rust products into ferric tannate or other iron phase products. In
single pack rust converter formulations based on tannin, the FTIR study showed that a
mixture of phosphoric acid and tannin is more effective than the tannin or phosphoric
acid alone in converting or transforming the iron rust products. Rust converter which
contained 9 % of tannin had been showed to be able to convert completely all the iron
rust products. Rust converter based on a polyvinyl-butyral resin (PVBR) containing
tannin in combination with zinc phosphate in the ratio of 1 : 1 had great potential as
rust converter. Using tannin or zinc phosphate alone was not effective as rust
converter.
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Keywords
To formulate rust converter formulations , based on tannin