| Titre : |
The formation of polyester-melamine/urethane coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Nadezda Denisova, Auteur ; Natalija B. Skopintseva, Auteur ; Daria Afanaseva, Auteur ; Evgenii Indeikin, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 48-50 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Analyse thermique
Coil coatings
Copolymère mélamine-formaldéhyde
Diisocyanate d'hexaméthylène
MéthylationLa méthylation est l'attache ou la substitution d'un groupement méthyle sur un substrat. La déméthylation est au contraire, la suppression d'un groupe méthyle sur un substrat.
Réticulation (polymérisation)
Revêtements -- Analyse
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés physiques
Revêtements organiques
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
One of the cost-effective ways to significantly influence the coating formation process and the performance of polyester coatings is to use a cross-linking agent containing an isocyanate. Methylated melamine-formaldehyde with a high degree of alkylation (HMMM) and methyl ethyl ketoxime-blocked hexamethylene diisocyanate (HDI) were used for polyester resin cross-linking. The influence of cross-lin king agents on coating performance and characteristics was studied using Small Amplitude Oscillatory Shear Rheomenty (SAOS), Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) techniques. The cross-linking degree of the polyester system containing the mixture of HMMM and HDI was shown to be significantly lower than that of the systems where only one of the cross-linking agents was used. High loss modulus values G" in the system with HMMM as compared to the system with HDI can be explained by a less dense three-dimensional network structure. With the decrease of HMMM and HDI the formation of three-dimensional network starts at a higher temperature. At the same time, when only the hardener content is reduced it leads to the decrease of the cross-linking degree. |
| Note de contenu : |
- Table 1 : System ingredients
- Table 2 : Cross-linking reaction start temperatures for the compositions studies
- Table 3 : Cross-link concentrations for the system
- Table 4 : Physical and mechanical properties of the films, PTM = 224°C, 60 sec
- Fig. 1 : Storage modulus (G') and loss modulus (G") during coating curing
- Fig. 2 : TGA - analysis a) Sample 1, b) Sample 2
- Fig. 3 : Storage modulus (G') and loss modulus (G") during coating curing
- Fig. 4 : The influence of curing temperature on residual heat of reaction
- Fig. 5 : The influence of curing temperature on the Tg |
| En ligne : |
https://drive.google.com/file/d/1BasgjNlsCHEPzXR6seqIu44IjZbJI9pu/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32608 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4651 (05/2019) . - p. 48-50
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