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Water permeation in coatings / E. Jalilian in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)
[article]
Titre : Water permeation in coatings Type de document : texte imprimé Auteurs : E. Jalilian, Auteur ; H. Terryn, Auteur ; G. Van Assche, Auteur Année de publication : 2020 Article en page(s) : p. 1437–1445 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Anticorrosion
Calorimétrie
Caractérisation
Gravimétrie (chimie analytique)
Pénétration (physique)
Perméation
Revêtements
ThermogravimétrieIndex. décimale : 667.9 Revêtements et enduits Résumé : The objective of this work is to develop and evaluate experimental approaches with different analytical techniques to measure the permeability, diffusivity, and solubility of water in model coatings. These properties are of primary relevance in studies of coatings for corrosion protection. For water permeation measurements, setups were designed and prepared to facilitate measurements by microcalorimetry, gravimetry, and thermogravimetric analysis. For sorption measurements, films were prepared in various thicknesses to allow a proper analysis with Fourier-transform infrared spectroscopy in transmission mode and gravimetry. Both methods are successful in following water uptake kinetic curves, being complementary in film thickness ranges that can be analyzed. The validity of the permeabilities calculated from permeation measurements is compared to results from group contribution methods and reported values in the literature. Diffusivities were determined using data from the transient region in sorption and permeation measurements, as well as from the steady-state permeation rate and equilibrium solubility in permeation and sorption measurements, respectively. Note de contenu : - MATERIALS AND METHODS : Materials - Sorption measurements - Permeation measurements
- RESULTS AND DISCUSSION : Materials - Sorption measurements - Permeation measurementsDOI : https://doi.org/10.1007/s11998-020-00377-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00377-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34950
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 6 (11/2020) . - p. 1437–1445[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22458 - Périodique Bibliothèque principale Documentaires Disponible Waterbased epoxy technologies for metal coating applications / Daniel Suckley in PAINTINDIA, Vol. LXX, N° 12 (12/2020)
[article]
Titre : Waterbased epoxy technologies for metal coating applications Type de document : texte imprimé Auteurs : Daniel Suckley, Auteur Année de publication : 2020 Article en page(s) : p. 78-86 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Epoxydes
Essais de brouillard salin
Formulation (Génie chimique)
Métaux -- Revêtements protecteurs
Revêtements en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : Epoxy resins are well known as high performance materials in various construction and metal coating applications, providing the combined properties of chemical resistance, adhesion, corrosion resistance and mechanical strength. They are one of the best materials available when comparing performance against relative cost and this has in turn led to epoxies being the substance of choice for use as flooring materials and for the corrosion protection of metal. They are often supplied as a two component system comprising a resin and a curing agent. Increasing environmental concems worldwide has led industries to experience a graduai shift towards water-based technologies as limits on emissions, VOC content and safety rulings become more prevalent across the world. Epoxy resins by their very nature are fundamentally incompatible with water and careful design of the molecule be it a curing agent or epoxy resin is crucial to deliver the products in aqueous media but when fully cured give the same high performance as conventional epoxy based materials. This careful design often leads to performance that exceeds that of conventional technologies which this paper intends to describe in detail. High molecular weight resins can be supplied at low easy-to-use viscosities giving performance advantages in the coating such as fast drying times and long pot )ives. Curing agents were designed with low amine contents through careful adjustments to their chemical structure giving a perfect balance between water miscibility and full compatibility with epoxy resins. The Combined waterbased resin and hardener system is further formulated in a 2 -pack corrosion protection coating that give high performance even when applied at relatively low dry film thickness, and is comparable to that ach ieved with conventional solvent-based coatings. Note de contenu : - Waterbased epoxy coating development
- Performance testing
- Fig. 1 : The chemical structure of a bisphenol A diglycidyl ether epoxy resin (BADGE)
- Fig. 2 : Reactive sites on a standard epoxy resin
- Fig. 3 : Film-forming mechanism of liquid-applied coatings
- Fig. 4 : The basic composition of a high performance waterbased epoxy resin
- Fig. 5 : Plot showing the viscosity rise profile of a waterbaset type epoxy emulsion (WB epoxy) and a liquid epoxy resin (YD 128) cured with the same curing agent
- Fig. 6 : Plot Showing the drying times of A waterbased type 1 epoxy emulsion (WB EPDXY) and a liquid epoxy resin (YD 128) cured with the same curing agent
- Fig. 7 : The generic chemical structure of a waterbased curing agent
- Fig. 8 : Viscosity profiles and coalescing behaviour of the base system (resin and curing agent)
- Fig. 9 : Adhesion properties of the formulated coating throughout it pot life
- Fig. 10 : Appearance of coated panels after 2000 hours of salt spray exposure (ASTM B117)
- Fig. 11 : Test data and coating appearance after salt water immersion
- Fig. 12 : The appearance of a waterbased coated panel and a solvent-based coated panel after 2000 hours salt spray exposure (ASTM B117)
- Table 1 : Physical specifications of the waterbased epoxy (Cetepox 484 R) and waterbased curing agent (Epotec THW 4510)
- Table 2 : Panel evaluation after salt-spray exposure
- Appendix A : Formulation for a 2-packWaterbased corrosion protection coating
- Appendix B : A summary of the main coating properties of the formualtion in A
- Appendix C : Formulation for a 2-packSolvent based corrosion protection coatingEn ligne : https://drive.google.com/file/d/1e75Op2FUkYv3N3Fd-eyPy5nBSgkLGw5M/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35203
in PAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 78-86[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22556 - Périodique Bibliothèque principale Documentaires Disponible Waterborne coatings based on acrylic latex containing nanostructured ZnO as an active additive / Martina Dankova in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)
[article]
Titre : Waterborne coatings based on acrylic latex containing nanostructured ZnO as an active additive Type de document : texte imprimé Auteurs : Martina Dankova, Auteur ; Andrea Kalendova, Auteur ; Jana Machotova, Auteur Année de publication : 2020 Article en page(s) : p. 517-529 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Antimicrobiens
Corrosion
Essais (technologie)
Formulation (Génie chimique)
Latex
Liants
Nanoparticules
Oxyde de zinc
Polyacryliques
Revêtements (produits chimiques):Peinture (produits chimiques)
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : This work was devoted to the study of the properties of an acrylate latex-based binder synthesized by semicontinuous emulsion polymerization. Nanoparticles of zinc oxide (NPsZnO) in an amount of 1.5 wt% with respect to the polymer content were added to the binder during the synthesis procedure. The binder was then homogenized with various anticorrosion pigments, fillers, and additives to obtain model anticorrosion paints. In addition, model paints with expected enhanced antimicrobial resistance designed for the protection of mineral substrates were also formulated and prepared. The effects of NPsZnO on the physicomechanical properties and on the chemical, anticorrosion, and antimicrobial resistance of the paint films were examined. The properties of the paints based on the synthesized binders were also compared to those of a commercial acrylate-type binder. The results show that incorporation of NPsZnO into the latex during the synthesis provided stable polymeric dispersions exhibiting physicochemical, mechanical, and anticorrosion properties that were superior to those of a blank binder (containing no nanoparticles) as well as to the commercial binder. It was also demonstrated that the binder with NPsZnO provided anticorrosion paints that are usable as coatings for environments with a moderate corrosion burden as well as paints for interior applications with reduced biocide contents. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Preparation of latexes - Formulation and preparation of the pigmented points - Preparation of paint films samples
- TESTING METHODS : Determination of the characteristic properties of the pigments, fillers, and binders - Physicomechanical and chemical properties of the prepared coatings - Antimicrobial properties of the coating films
- RESULTS AND DISCUSSION : Determination of the characteristic material properties - Hardness evaluation : Buchholz indentation test - Flash corrosion evaluation for the anticorrosion paints - Evaluation of mechanical and chemical resistance of the anticorrosion paints - Evaluation of the corrosion resistance of the paint films after exposure to a condensation-water atmosphere - Evaluation of the antimicrobial resistance of the paints designed for mineral substratesDOI : https://doi.org/10.1007/s11998-019-00302-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00302-6.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34000
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 2 (03/2020) . - p. 517-529[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21658 - Périodique Bibliothèque principale Documentaires Disponible Waterborne coatings direct-to-metal (DTM) applications / Raymond Stewart in COATINGS TECH, Vol. 6, N° 9 (10/2009)
[article]
Titre : Waterborne coatings direct-to-metal (DTM) applications Type de document : texte imprimé Auteurs : Raymond Stewart, Auteur ; Ramesh Subramanian, Auteur Année de publication : 2009 Article en page(s) : p. 26-30 Note générale : Annexes - Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion
Dispersions et suspensions
Métaux -- Revêtements protecteurs
Métaux -- Revêtements:Métaux -- Peinture
Polyuréthanes
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.6 Peintures Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6319
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Code-barres Cote Support Localisation Section Disponibilité 011689 - Périodique Bibliothèque principale Documentaires Disponible Waterborne corrosion-resistant hydrophobic alkyd resin composite coatings modified with fluorinated acrylate–siloxane and submicron-sheet zinc phosphate pigment / Shenjie Zhong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)
[article]
Titre : Waterborne corrosion-resistant hydrophobic alkyd resin composite coatings modified with fluorinated acrylate–siloxane and submicron-sheet zinc phosphate pigment Type de document : texte imprimé Auteurs : Shenjie Zhong, Auteur ; Kang Qin, Auteur ; Yi Hou, Auteur ; Tianqi Xu, Auteur ; Ying Cai, Auteur ; Lingmin Yi, Auteur Année de publication : 2021 Article en page(s) : p. 1309-1320 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Hydrophobie
Phosphate de zinc
Pigments organiques
Polyalkydes
Revêtements en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : Waterborne polymeric coating for corrosion protection has been of particular interest both in academia and industrial circles for years because of its low cost and low-volatile organic compound (VOC) emissions. However, organic coating is permeable to water and oxygen resulting in the reduction of anticorrosion properties during coating application. In this study, waterborne corrosion-resistant hydrophobic-modified alkyd resin composite coatings using fluorinated acrylate–siloxane (FASAR) and submicron-sheet zinc phosphate (Zn3(PO4)2) pigment were prepared. The results of hydrophobicity, thermal, and mechanical measurements indicated that the FASAR30/5%Zn3(PO4)2 had excellent performance. More importantly, the EIS and potentiodynamic polarization tests revealed that the acquired films also exhibited high anticorrosion property for carbon steel. The corrosion current density (icorr) was 7.20 × 10−7 A cm−2, with an inhibition efficiency of 99.92%, and a corrosion rate of 8.37 × 10−3 mm per year. On the other hand, the impedance modulus (Zf = 0.01 Hz) of FASAR30/5%Zn3(PO4)2 still had 5.68 × 104 Ω cm2 after 14-day immersion in the 3.5 wt% NaCl solution. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of FASAR via emulsions miniemulsion polymerization - Preparation of waterborne FASAR and FASAR/submicron-sheet Zn3(PO4)2 composite latex films - Coating process for carbon steel
- CHARACTERIZATIONS : Morphology and size distribution of emulsion - Chemical structure of hybrid composite films - Wettability of the composite latex films - Mechanical property tests and thermal stability of composite latex films - Anticorrosion tests of composite latex films
- RESULTS AND DISCUSSION : The morphology and sizes of FASAR emulsions - FTIR analysis - Dispersion of Zn3(PO4)2 in the composite latex films - Hydrophobicity of composite latex films - Mechanical and thermal properties of composite latex films - The corrosion properties of composite latex films
- Table 1 : Recipes and properties of the FASAR emulsions
- Table 2 : Contact angle values and surface energies of the thin films of composite latexes
- Table 3 : The mechanical properties of composite latex films
- Table 4 : TGA data of the composite latex films
- Table 5 : Electrochemical parameters obtained from PDP studies for FASAR0, FASAR30 and FASAR30/submicron-sheet Zn3(PO4)2 coated CS in 3.5 wt% NaCl at room temperature
- Table 6 : Electrochemical impedance spectroscopy data for uncoated FASAR0, FASAR30 and FASAR30/submicron-sheet Zn3(PO4)2-coated CS in 3.5 wt% NaCl at room temperatureDOI : https://doi.org/10.1007/s11998-021-00493-y En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00493-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36434
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1309-1320[article]Réservation
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