| Titre : |
Attributing the crosslinking density to water vapor transmission rate of an acrylic-melamine automotive clearcoat |
| Type de document : |
texte imprimé |
| Auteurs : |
M. Nasirzadeh, Auteur ; H. Yahyaei, Auteur ; S. M. Lashgari, Auteur ; Mohsen Mohseni, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 239-246 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Analyse thermomécanique dynamique
Angle de contact
Caractérisation
Copolymère acrylique mélamine
Densité
Dureté (matériaux)
Formulation (Génie chimique)
Résistance chimique
Réticulation (polymérisation)
Transmission de vapeur d'humidité
Vernis
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
In this study, the effect of crosslinking density of an acrylic-melamine clearcoat on water vapor transmission rate was evaluated. Four types of acrylic resins with different OH contents were used as the main polymeric backbone of the acrylic-melamine clearcoat. Also, three different acrylics to melamine–formaldehyde ratios were used in the coating formulations to obtain various crosslinking densities. It was observed that other film properties such as surface hydrophilicity and molecular homogeneity had a crucial impact on the clearcoat water vapor transmission rate together with the crosslinking density. Surprisingly, results showed that samples with acrylic resin with less OH content and lower melamine–formaldehyde crosslinker had the lowest water vapor transmission rate among other samples. These results were in agreement with the water contact angle and the data deduced from dynamic mechanical thermal analysis (DMTA) results of clearcoats. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Preparation of acrylic-melamine clearcoat
- CHARACTERIZATION
- RESULTS AND DISCUSSION
- WATER CONTACT ANGLE : ATR-FTIR results - Solvent resistance - The hardness of the clearcoats - Dynamic mechanical thermal properties (DMTA) - Water vapor transmission rate
- Table 1 : The composition of clearcoats
- Table 2 : Water contact angle with clearcoats (degree)
- Table 3 : The hardness results (with standard deviation) of the clearcoats
- Table 4 : The crosslink density of the clearcoats calculated with storage modulus in rubber plateau
- Table 5 : The homogenity data obtained from loss tangent graphs
- Table 6 : Water vapor transmission, grams per square meter per 24h |
| DOI : |
https://doi.org/10.1007/s11998-020-00400-w |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-020-00400-w.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35366 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 1 (01/2021) . - p. 239-246
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