Role of Phthalic and Glycolic Acids to Increase Chromium Uptake in Leather Tanning Process
Evaluate phthalic (PhA) and glycolic (GA) acids as inducer agents in chrome tanning has been attempted in the present study. Based on pelt weight, three concentrations from PhA or GA (0.5%, 1% and 2%) were studied in pickling step then pelts were tanned with chromium sulphate. Chrome exhaustion, leather uptake, scanning electron micrographs, mechanical and chemical properties were determined for each experimental groups. Using PhA or GA was improved the chromium leather uptake, mechanical properties and reduce chromium waste in spent liquors. Chrome exhaustion greater than 95% and 85% has been achieved when added PhA or GA, respectively. While increasing concentration was enhanced chromium exhaustion, leather uptake and mechanical properties were improved with added concentration 0.5% better than other concentrations. scanning electron micrographs (SEM), fiber bundles were more cementation, cross-linking and higher fullness in added chelating groups than chrome alone.
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Figure 5.Electron micrographs of BCS control and experimental groups
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