Factors influencing the interlayer adhesion in the CED primer/waterborne coating system / Natalia Vlasova in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4654 (09/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 29-30 Titre : Factors influencing the interlayer adhesion in the CED primer/waterborne coating system Type de document : texte imprimé Auteurs : Natalia Vlasova, Auteur ; Valentina Miloslavskaya, Auteur ; Larisa Sakharova, Auteur ; Viktor Ozhiganov, Auteur ; Evgenii Indeikin, Auteur Année de publication : 2019 Article en page(s) : p. 29-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Anticorrosifs Anticorrosion Copolymère mélamine-formaldéhyde Copolymère uréthane époxy Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Polyesters Primaire (revêtement) Réticulants Revêtements en phase aqueuse -- Additifs Revêtements protecteurs Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : The authors discusses a study of an epoxy urethane cathodic electrodeposition primer and polyester melamine paint, containing melamine-formaldehyde cross-linking agents with different alkylation degrees and types, as well as an acid catalyst for acceleration of the curing process. Among the broad variety of anticorrosion coatings, cathodic electrodeposition (CED) primers have an undeniable superiority. Such primers are overcoated with weather resistant coatings to obtain weatherability and the necessary decorative properties. From the point of view of environmental safety and fire protection, waterborne stoving paints are of the highest interest, however, there is a risk of interlayer adhesion failure due to the primer layer over-drying. In the present work, epoxy urethane cathodic electrodeposition primer and polyester melamine paint, containing melamine-formaldehyde cross-linking agents with different alkylation degrees and types as well as an acid catalyst for acceleration of the curing process have been studied. The physical and chemical factors influencing the interlayer adhesion in the system consisting of epoxy urethane CED primer and polyester melamine waterborne stoving paint have been investigated and conditions under which a complete interlayer adhesion failure occurs have been determined. Note de contenu : - Materials and methods - Waterborne coating crosslinking rate and degree - CED primer/waterborne coating interlayer adhesion - Interfacial energy properties - Fig. 1 : Storage modulus vs time for the curing of the coatings with PMMM - 1 ; HMMM without a catalyst - 2 ; HMMM with 0.3%p-TSA - 3 and the temperature curve - 4 - Fig. 2 : Intertayer adhesion of the waterborne coating with PMMM (1) HMMM without the catalyst (2), HMMM with 0.3%p-TSA(3)to CED primer cured at 165°C for 15min. (a), at 165°C for 30min (b), at 180°C for 15min (c), at 180°C for 30min (d) - Table 1 : Polyester coating MEK resistance - Table 2 : MEK-resistance of CED primers - Table 3 : Interlayer adhesion for different CED primer/waterborne coating systems - Table 4 : Specific surface energy and its components for the CED primer surfaces - Table 5 : Surface tension for liquid waterborne coatings - Table 6 : Interfacial tension between the CED primer and the waterborne coating En ligne : https://drive.google.com/file/d/1EcybHljC3XOLsbF72p-bKBBpL1FHz8gY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32918 [article]

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