| Autor: |
Onur, YILMAZ, Hasan, OZGUNAY, Ersin, ONEM, Bahri, BASARAN, Ali, YORGANCIOGLU |
| Předmět: |
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| Zdroj: |
Annals of the University of Oradea. Fascicle of Textiles, Leatherwork; 2022, Vol. 23 Issue 2, p101-108, 8p |
| Abstrakt: |
The present study report on the attempts of synthesis of synthetic tanning agents based on different starting materials of phenol, urea, salicylic acid, resorcinol, dihydroxydiphenyl sulfone via condensation with formaldehyde. After many trials, best results were obtained from phenol-formaldehyde, phenol-ureaformaldehyde and dihydroxydiphenyl sulfone-formaldehyde systems. It was shown that the experiments with other starting materials need further investigations and more detailed studies for controlled reactions to obtain usable resins. The pH values and dry matter contents of the successful resins obtained from reactions were determined and the structural analysis was done by FTIR. Then the produced syntans were used as solo tanning agents for the tanning of pickled sheep skins. The results showed that all the leathers tanned with the synthesized syntans had shrinkage temperatures over 70 °C. Moreover, the filling coefficients of the produced syntans, the physical properties of the leathers in terms of tensile strength, percentage of elongation and tear strength were investigated. The produced syntans gave very white and/or light beiege colors with a good filling effect and plain grain structure. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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