|
Authors
|
Gedan-Smolka, M. ; Lehmann, F. ; Lehmann, D.
|
|
Title
|
New Catalysts for the Low Temperature Curing of Uretdione Powder Coatings
|
|
Date
|
11.06.2002
|
|
Number
|
9908
|
|
Abstract
|
Dialkyl-tin-di-carboxylates, dialkyl-tin-di-alkoholates and metall--di-carbonylic compounds were<br />obtained as effective catalysts for the reaction of uretdione groups with OH- groups in melt. Using low<br />molecular weight model systems and zinc(II)-acetylacetonate as catalyst a reduction of the reaction<br />maximum Tmax of about 90 K compared with the non catalyzed system could be detected by non-isothermal<br />DSC measurements. The mechanism of the reaction between uretdione and OH-groups was studied by the<br />use of temperature dependent FTIR measurements, 1H and 13C NMR spectroscopy. For isothermal curing at<br />temperatures below 160°C a new reaction mechanism was proved for reactions in melt. The catalayzed<br />reaction between uretdione and OH-groups lead to allophanate structures and showed a high selectivity.<br />The results were successfully transfered into reactive polymeric models. Initial studies of film properties<br />obtained with the catalyzed reaction were evaluated using powder coating model samples.
|
|
Publisher
|
International Journal of Coatings Science (Online-Journal)
|
|
Wikidata
|
|
|
Citation
|
International Journal of Coatings Science (Online-Journal) (2002) www.coatingscience.org
|
|
DOI
|
http://www.usm.edu/ijcs/journal/abstracts/vol_1_2002/DocOne_Abstract.pdf
|
|
Tags
|
|
