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Designing self-stratify coatings based on epoxy-PU systems containing three pigments / Shahdad Zahedi in SURFACE COATINGS INTERNATIONAL, Vol. 103.5 (09-10/2020)
[article]
Titre : Designing self-stratify coatings based on epoxy-PU systems containing three pigments Type de document : texte imprimé Auteurs : Shahdad Zahedi, Auteur ; Seyed Reza Ghaffarian, Auteur Année de publication : 2020 Article en page(s) : p. 268-273 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Caractérisation
Copolymère uréthane époxy
Dioxyde de titane
Formulation (Génie chimique)
Oxyde de fer micacé
Pigments
Revêtement en phase solvant
Revêtements autostratifiants
Verre -- Revêtements
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : A self-stratifying coating contains at least two resins of different natures, which spontaneously stratify after application on a substrate. Various self-stratifying systems have been reported in the literature, but self-stratifying coatings containing three pigments have rarely been discussed. In this paper, a series of self-stratifying coatings based on an epoxy-PU system and containing three pigments, i.e. zinc dust, micaceous iron oxide (MIO) and titanium dioxide (TiO2) were prepared and applied on glass plates. Stratification was studied and evaluated by Fourier Transform Infrared Spectroscopy using Attenuated Total Reflectance (FTIR-ATR) on both sides of the films. Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDX) analyses and mappings with line scans from cross-sections of the films were carried out to characterise the degree of stratification and the location of the pigments. The aim of this research is to study the factors that affect stratification and the location of the pigments in self-stratifying coatings containing three pigments, and leading to the design of a three-layered self-stratifying epoxy-PU anti-corrosive coating system. It was found that a higher solid percent of epoxy resin has a positive effect on stratification and pigment location. It was also found that better stratification was obtained by replacing some of the xylene in a formulation with a solvent with a higher evaporation rate (butyl acetate). Note de contenu : - EXPERIMENTAL : Materials - Coatings formulation
- RESULTS AND DISCUSSION : FTIR-ATR results - SEM/mapping results
- Fig. 2 : SEM/mapping images, F5-F7 formulas
- Fig. 3 : Line scans for films of 5, F6 and F7 formulations
- Fig. 4 : Liquid formulations F3, F4 and F7 in clear bottles after 72 hours storage
- Table 1 : Prepared formulations
- Table 2 : Weight percentage of elements in the top and bottom areas in the film cross-sections for F5, F6 and F7 formulations by EDXEn ligne : https://drive.google.com/file/d/16cUOIqMPjQJs10ysmgZdKtqQZkXPdmnw/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34728
in SURFACE COATINGS INTERNATIONAL > Vol. 103.5 (09-10/2020) . - p. 268-273[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22306 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of the anticorrosive behaviour of organic coatings applied on a Zn-21Al-2Cu alloy / L. S. Hernandez in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B1 (02/2004)
[article]
Titre : Evaluation of the anticorrosive behaviour of organic coatings applied on a Zn-21Al-2Cu alloy Type de document : texte imprimé Auteurs : L. S. Hernandez, Auteur ; L. A. Hernandez-Alvarado, Auteur ; O. Dominguez, Auteur ; A. A. Torres, Auteur Année de publication : 2004 Article en page(s) : p. 1-6 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages
Anticorrosifs
Anticorrosion
Caoutchouc chloré
Copolymère uréthane époxy
Essais d'adhésion
Métaux -- Revêtements protecteurs
Métaux -- Revêtements:Métaux -- Peinture
Phosphate de zinc
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Painting of a Zn-21wt%Al-2wt% Cu alloy, with four different superficial conditions, was carried out without difficulties using conventional paint systems recommended for applications over galvanised steel and even a common system to paint steel. The preparation of the ternary alloy surfaces by means of two phosphating treatments led to a slight improvement in the performance of the paint systems in exposure tests to a NaCl solution, a SO2 atmosphere and to weathering. Hardly any difference was observed among the superficial conditions in the adhesion tests. After 11 years of atmospheric exposure, specimens of the ternary alloy coated with the epoxy-polyurethane or the chlorinated rubber paint systems did not present major symptoms of degradation. Note de contenu : - Table 1 : Characteristics of paint systems applied on Zn-21Al-2Cu alloy
- Table 2 : Initial adhesion values of paintsystems to Zn-21Al-2Cu alloy
- Table 3 : Adhesion values of paint systems to Zn-21Al-2Cu alloy. Immersed 92 days in a 3% NaCl solution then dried 7 days at room temperatureDOI : 10.1007/BF02699557 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699557.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5475
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B1 (02/2004) . - p. 1-6[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000392 - Périodique Bibliothèque principale Documentaires Disponible 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)
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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
MélamineLa 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 superficielleIndex. 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 coatingEn ligne : https://drive.google.com/file/d/1EcybHljC3XOLsbF72p-bKBBpL1FHz8gY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32918
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 29-30[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21175 - Périodique Bibliothèque principale Documentaires Disponible