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]  inSURFACE COATINGS INTERNATIONAL > Vol. 103.5 (09-10/2020) . - p. 268-273 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 Zinc Index. 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 EDX En ligne : https://drive.google.com/file/d/16cUOIqMPjQJs10ysmgZdKtqQZkXPdmnw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34728 [article]

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Designing self-stratifying coatings through the study of pigment migration / Shahdad Zahedi in SURFACE COATINGS INTERNATIONAL, Vol. 101.6 (12/2018 - 01/2019)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 101.6 (12/2018 - 01/2019) . - p. 288-293 Titre : Designing self-stratifying coatings through the study of pigment migration Type de document : texte imprimé Auteurs : Shahdad Zahedi, Auteur ; Davood Zaarei, Auteur ; Seyed Reza Ghaffarian, Auteur ; Maude Jimenez, Auteur Année de publication : 2018 Article en page(s) : p. 288-293 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Dioxyde de titane Energie de surface Epoxydes Formulation (Génie chimique) Oxyde de fer Pigments inorganiques Revêtements autostratifiants Index. décimale : 667.9 Revêtements et enduits Résumé : Self-stratifying coatings are smart coatings which represent a new generation of surface coatings for industry which offer the advantages of single-coat application, thereby reducing resources and potential pollution when compared to conventinal multi-layer coating systems. In our work, the effect of pigments on stratification was studied. Ten formulations were made based on epoxy and fluorinated vinyl ether incorporation of inorganic pigments containing titanium dioxide and red iron oxide. Evaluations were made by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX) and mapping from cross-sections through the films. Results demonstrate that the affinity of the pigments for different resins, and also the quality of their dispersion and stabilisation in the initial phase, both play important roles in the stratification phenomena. Note de contenu : - Materials - Formulation and application - Results and discussion : Stratification of clear coatings - Stratification of single-pigment coatings - Stratification of dual-pigment coatings - Table 1 : Prepared formulations - Table 2 : Percentage of elements in top and bottom areas in cross-section of clear coating formulation (Formula 3) by EDX - Table 3 : Percentage of elements in top and bottom areas in cross-section of single-pigment formulations 4, 5, 7 and 8 by EDX - Table 4 : Stratification type by formulation - Table 5 : Percentage of elements in top and bottom areas in cross-section of single-pigment formulations 6, 9 and 10 by EDX - Table 6 : Contact angle measurement and surface energies (polar and dispersive components) of films by using three liquids (water, ethylene glycol and di-iodomethane) - Table 7 : Surface energy relations and stratification conditions - Fig. 1 : SEM and mapping images for SSC clear coating system (formula 3) - Fig. 2 : SEM and mapping images for single-pigment systems (formulations, 4, 5, 7 and 8) - Fig. 3 : SEM and mapping images for dual-pigment systems (formulations 6, 9, and 10) En ligne : https://drive.google.com/file/d/11o-EpvH5VXJK-GS1nC5NArN3pTtgN975/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31651 [article]

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Self-stratifying coatings : a review / Shahdad Zahedi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 1 (01/2018) . - p. 1-12 Titre : Self-stratifying coatings : a review Type de document : texte imprimé Auteurs : Shahdad Zahedi, Auteur ; Davood Zaarei, Auteur ; Seyed Reza Ghaffarian Année de publication : 2018 Article en page(s) : p. 1-12 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Antimicrobiens Chimie des surfaces Dioxyde de titane Pigments Revêtements antisalissures:Peinture antisalissures Revêtements autostratifiants:Peinture autostratifiante Revêtements organiques Séparation (technologie) Solubilité Index. décimale : 667.9 Revêtements et enduits Résumé : A self-stratifying coating is an economical coating containing multiresinous components with different functional groups, which spontaneously stratify after application to the substrate. These coating systems could be composed of two or more different layers to protect substrates against corrosion, by first layer, and simultaneously to create a desirable appearance, by second layer, with decorative properties. Conventional multilayer coating systems encounter some problems such as poor interfacial adhesion, application, and labor costs and also lengthy processing time. The concentration gradient of two layers would eliminate the inter-coating boundary which can be the point of failure in conventional coatings. In this paper, the surface tension and solubility theory regarding these coatings are discussed. In addition, the effects of different factors on the pigment location into the coating systems are studied. The main factors, including curing mechanisms, substrate effects, thickness, viscosity, kinetics of reaction, evaporation rate of solvents, dispersing agents, and surface properties of pigments have been reviewed. The models for prediction of self-stratifying coatings such as UNIFAC and computer simulation have also been addressed and taken into consideration. The prospect of these coatings and their application in different industries is presented. Note de contenu : - STRATIFICATION THEORIES : Phase separation/solubility parameter/density differences - Kinetics aspects (effect of evaporation rate on self-stratification)- Surface tension relations - RESEARCH TRENDS IN SELF-STRATIFYING COATINGS - PIGMENTED SELF-STRATIFYING COATINGS - MODELS FOR PREDICTION SELF-STRATIFICATION OF COATINGS : UNIFAC model - Surface energy variation with concentration of two polymers -Computer model for self-stratification - INDUSTRIAL APPLICATION OF SSC : Corrosion Resistance of SSC - Self-stratification in antimicrobial and antifouling coatings - EVALUATION METHODS FOR STRATIFICATON - NEW APPROCHES IN SSC DOI : 10.1007/s11998-017-9996-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9996-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30050 [article]

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