[article]
| Titre : |
Scratch resistance behavior of model coating systems |
| Type de document : |
texte imprimé |
| Auteurs : |
Rose Ann Ryntz, Auteur ; B. D. Abell, Auteur ; G. M. Pollano, Auteur ; L. H. Nguyen, Auteur ; W. C. Shen, Auteur |
| Année de publication : |
2000 |
| Article en page(s) : |
p. 47-53 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Tags : |
Industrie automobile Matériau revêtement Peinture Propriété mécanique Feuil Résistance rayure Température transition vitreuse Densité réticulation Etude expérimentale |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Coatings are often subjected to physical deformations caused by car wash brushes, three limbs, keys, fingernails, and the like, which may results in mechanical abrasion. The resistance of the coating to scratches imposed by such mechanical abrasions has been studied through the utilization of laboratory tests such as nanoindentors, crockmetyers, scanning proble microscopes, and taber abraders. Little emphasis, however, has been placed on the influence of coating attributes on measured scratch resistance. In this study we attempt to relate the effect of coating glass transition temperature, crosslink density, and crosslink type in a series of formulated waterborne polyurethane dispersion clearcoats on resultant scratch resistance. Methods utilized to impart the scratches, e.g., scanning probe microscopy, weighted fingernail, and crockmeter, as well as related coating physical properties measured, e.g., viscoelastic behavior, hardness, and tensile strength, are discussed. The scratch resistance of model coating systems analyzed was found to be dependent upon the base resint Tg, which affected the surface hardness of the coating and the toughness of the crosslinked network, as measured by the method of essential work. Coatings that exhibited both hard surfaces and tough-elastic network integrity afforded the optimized scratch resistance behavior. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5806 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 904 (05/2000) . - p. 47-53
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