Mechanism for environmental etch of acrylic melamine-based automotive clearcoats: Identification of degradation products
| Autor: | P. J. Schmitz, Li-Feng Xu, Joseph W. Holubka |
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| Rok vydání: | 2000 |
| Předmět: |
Reaction mechanism
Melamine resin Materials science technology industry and agriculture Surfaces and Interfaces engineering.material Ammeline Surfaces Coatings and Films chemistry.chemical_compound Hydrolysis chemistry Chemistry (miscellaneous) Polymer chemistry engineering Acid hydrolysis Melamine Chemical decomposition Triazine |
| Zdroj: | Journal of Coatings Technology. 72:39-45 |
| ISSN: | 0361-8773 |
| DOI: | 10.1007/bf02698018 |
| Popis: | This paper focuses on defining the reaction mechanism involved in the environmental etch of acrylic melamine-based automotive clearcoats via an identification of reaction products. This has been accomplished through a comparative study of products formed on acid treatment of neat crosslinkers, and those formed following laboratory acid treatment and field exposure of acrylic melamine clearcoat systems. Bulk elemental, X-ray photoelectron spectroscopy (XPS), and infrared (IR) analyses of sulfuric acid-treated melamine crosslinkers show that acid hydrolysis results primarily in the formation of melamine sulfate. Melamine sulfate formation was also observed following laboratory and field exposure of acrylic melamine clearcoat systems. These results confirm that the primary mode of melamine crosslink decomposition is through hydrolysis of acetal linkages and subsequent formation of melamine sulfates. However, data show that hydrolysis of pendent amino groups on the triazine ring also occurs. |
| Databáze: | OpenAIRE |
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