Structure-Activity-Relationships of Synthetic Organic Tanning Agents
In this paper the structure of various syntans are studied and compared to natural tanning agents.Following structure-property relationships were found in reference to tanning efficiency:-Although many natural tannins contain methoxy groups, we could not positively proof a tanning effect of methoxy groups as such.-The spacer group between the phenol moieties does play a role in tanning. Comparing different spacers the benzyliden spacer proofed to be most beneficial for shrinkage temperature. However based on physico-chemical properties (solubility, accessibility) the methylene and sulfon spacer appear more favorable. -Natural tannins frequently contain higher oxidized moieties based on catechol or pyrogallol. Trials showed that their influence on the shrinkage temperature was less pronounced than the effect on lightfastness of the obtained leathers, with the phenol based product giving best lightfastness.-The molecular weight of condensates influences the tanning capacity. We used products of three different molecular weights all containing the sodium salt of phenolsulfonic acid and achieved shrinkage temperatures that differed significantly and increased with molecular weight of the condensate.
Syntan Structure-Activity Relationship Formaldehyde Condensate Sulfon
Jochen Ammenn Franz Glocknitzer Franca Tiarks Gerhard Wolf
BASF SE, EVX/L-G100, 67056 Ludwigshafen, Germany BASF Auxiliary Chemicals Co Ltd G-EVX/LGD 300 Jiangxinsha Road, Pudong 200137 Shanghai, China
国际会议
北京
英文
190-193
2009-10-11（万方平台首次上网日期，不代表论文的发表时间）