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Accelerating coatings development with high throughput technology in COATINGS TECH, Vol. 14, N° 8 (08/2017)  

[article]  inCOATINGS TECH > Vol. 14, N° 8 (08/2017) . - p. 19-21 Titre : Accelerating coatings development with high throughput technology Type de document : texte imprimé Année de publication : 2017 Article en page(s) : p. 19-21 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automatisation Procédés de fabrication Production haut débit Revêtements:Peinture Technique de la production Index. décimale : 667.9 Revêtements et enduits Résumé : Continually evolving demands for greater coating performance and functionality, the increasing complexity of the regulatory landscape, and growing competition around the globe are driving the need for accelerated development of coating raw materials and formulated products and more rapid problem-solving capabilities. High throughput technology, originally developed in the pharmaceutical industry, is being adapted by companies in the coatings sector to meet these important and growing challenges. En ligne : https://drive.google.com/file/d/1tfFA0PiDpxnh7AR1mE02TWLeTUAk2sAp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28867 [article]

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Novel isocyanate-free moisture-curable polymers for single-components polysiloxane topcoats / Erick Lezzi in COATINGS TECH, Vol. 14, N° 8 (08/2017)  

[article]  inCOATINGS TECH > Vol. 14, N° 8 (08/2017) . - p. 22-28 Titre : Novel isocyanate-free moisture-curable polymers for single-components polysiloxane topcoats Type de document : texte imprimé Auteurs : Erick Lezzi, Auteur Année de publication : 2017 Article en page(s) : p. 22-28 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bateaux -- Revêtements:Bateaux -- Peinture Résistance aux conditions climatiques Résistance chimique Réticulation à l'humidité Revêtement monocomposant:Peinture monocomposant Revêtements -- Finition:Peinture -- Finition Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 667.9 Revêtements et enduits Résumé : The U.S. Naval Research Laboratory (NRL) recently developed novel alkoxysilane-terminated N-substituted urea polymers for use in moisture-curable, single-component (1K) polysiloxane topcoats for military assets. These polymers demonstrate similar mechanical properties and chemical resistance to polyurethanes, yet do not contain harmful isocyanates. The polymers can be synthesized in a variety of polar and aromatic solvents to provide low viscosity solutions, thus allowing for the generation of topcoats that are free of hazardous air pollutants (HAPs) and contain low levels of volatile organic compounds (VOCs). These polymers have been primarily utilized to formulate 1K polysiloxane topcoats for use on the exterior of Navy surface ships and aircraft, yet they are applicable to a variety of non-military markets where exterior durable topcoats are required. For Navy ships, the 1K polysiloxane topcoat is designed as a haze gray colored system that is <250 g/l VOCs, provides a semi-gloss finish once cured, will adhere to high solids epoxy primers, and offers enhanced weatherability and hydrocarbon resistance compared to legacy Navy topcoats. The coating can be brush- and roll-applied by sailors for touchup/repair applications or spray-applied by contractors during depot-level maintenance. For Navy aircraft, the 1K topcoat is designed as a camouflage gray colored system that is <300 g/l VOCs, is spray-applied via high-volume low-pressure (HVLP) equipment, provides a low-gloss finish once cured, and demonstrates comparable flexibility, weatherability, and hydrocarbon resistance to qualified polyurethane topcoats. Gloss topcoats for Navy aircraft have also been formulated using these novel polymers. Laboratory testing of these 1K polysiloxane topcoats to military specifications (MIL-Specs.) and demonstrations on military assets will be discussed herein. Note de contenu : - INTRODUCTION : Legacy surface ship and aircraft topcoats - NOVEL POLYMERS FOR SINGLE-COMPONENT POLYSILOXANE TOPCOATS - EXPERIMENTAL PROCEDURE - RESULTS : Single-components polysiloxane topcoat for navy surface ships - Single-components polysiloxane topcoat for navy aircraft En ligne : https://drive.google.com/file/d/1w2daqu09aumCrR2LKgt4-Lik1WgshaO5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28868 [article]

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Isocyanate-free Michael addition cured aliphatic topcoats / M. Gessner in COATINGS TECH, Vol. 14, N° 8 (08/2017)  

[article]  inCOATINGS TECH > Vol. 14, N° 8 (08/2017) . - p. 30-40 Titre : Isocyanate-free Michael addition cured aliphatic topcoats Type de document : texte imprimé Auteurs : M. Gessner, Auteur ; A. Nanda, Auteur ; R. Subramanian, Auteur ; D. Sauer, Auteur ; W. DeGooyer, Auteur ; E. McCracken, Auteur ; L. Lindsey, Auteur ; F. G. H. van Wijk, Auteur Année de publication : 2017 Article en page(s) : p. 30-40 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages. Composés aliphatiques Durée de vie en pot Isocyanates Malonate de diéthyle Le malonate de diéthyle est le diester éthylé de l'acide malonique. On le trouve naturellement dans le raisin et les fraises. C'est un liquide incolore, d'odeur proche de la pomme. Il est utilisé en parfumerie, et pour la synthèse de composés comme les barbituriques, les arômes artificiels et les vitamines B1 et B6. Il est aussi le réactif initial de la synthèse d'une grande quantité d'acides carboxyliques via la synthèse malonique. Par condensation aldolique avec le salicylaldéhyde, il donne la coumarine. Michael, Addition de L'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées. Cette réaction doit son nom au chimiste américain Arthur Michael. Réticulants Réticulation (polymérisation) Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : In 2015, the breakthrough of a novel blocked catalyst and kinetic control additive package used in conjunction with Michael Addition chemistry was announced at the European Coating Conference. Prototype paint formulae highlight the very fast drying 2K system (<15 min, ambient) and the unique de-coupling of dry time and pot life (>5 h), expected to trigger new paint and process solutions. The fast-cure system was designed as a topcoat over epoxy primers for use in the industrial market. The advantages of fast cure, long pot life, and low- to no-baking were described at other conferences since the introduction. However, most factory-applied systems do not fully make use of these advantages. Air-dry-only applications fully use the advantages of this new technology. Furthermore, the base-catalyzed system is a natural consideration for use over alkaline surfaces such as concrete. Very low-VOC/air-dried coatings can be made using reactive diluents, which can reduce paint viscosity, but also greatly increase the crosslink density. There are also available low-viscosity crosslinkers, which reduce the viscosity of the paint, yield good paint properties, and have excellent appearance. This article shows the low-VOC potential while the fast-dry nature allows fast return-to-service for flooring and other applications. Note de contenu : - INTRODUCTION : Controlling pot life and drying - Formulating for low-VOC paints - EXPERIMENTAL : Diethyl malonate - Malonate functional reactive diluents - 100% reactive and lower molecular weight resin - Improving performance with reactive diluents - Formulating low-VOC floor coatings - SCHEMES : 1. The Michael Addition reaction between malonate and acrylate - 2. Blocked catalyst formation and activation ; HA represents a proton donor - FIGURES : 1. Generalized picture of pot life-drying balance. Blue area : the "world" of OH and NH isocyanate curing ; red area : the field of operation for FCT-based paints. Overlapping area denotes the "aspartates" region (NH-isocyanate) - 2. Effect of volatile alcohols added to th epaint on pot life and drying time (dry-through, rign) ; weight % on solid binder (malonate polymer + acryloyl) ; pot life as a double viscosity - 3. pKa of materials suitable for Michael Addition - 4. FTIR spectra showing the region around 809 cm-1 - 5. Catalyzed solids and % residual double bonds - 6. Oligomer/DiTMPTA paints - 7. Resin/oligomer/DiTMPTA paints - 8. GPC-standard vs low molecular weight resins - 9. Molecular weight effect on paint viscosity, hardness, and dry time - 10. Molecular weight effect on MEK resistance - 11. Reactive dilent effects on standard molecular weight resins - 12. Reactive diluent effects on low molecular weight resins - 13. FCT applied to warehouse floors - 14. FCT applied to warehouse floors - 15. FCT applied to warehouse floors - TABLES : 1. Malonate functional reactive diluents - 2. Resin constants - 3. Paints applied to concrete floor En ligne : https://drive.google.com/file/d/1G8uOhIuBkJW0ZRJyc1ZxgO7jLYE7Ap2c/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28869 [article]

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Isocyanate free polyurethane technology for wood coating applications : approaches to reducing VOC in clearcoat formulations / Jeffrey Wexler in COATINGS TECH, Vol. 14, N° 8 (08/2017)  

[article]  inCOATINGS TECH > Vol. 14, N° 8 (08/2017) . - p. 42-52 Titre : Isocyanate free polyurethane technology for wood coating applications : approaches to reducing VOC in clearcoat formulations Type de document : texte imprimé Auteurs : Jeffrey Wexler, Auteur ; Rebecca Ortiz, Auteur ; Nahrain Kamber, Auteur ; Nicholas Leonard, Auteur ; Yanxiang Li, Auteur ; Paul Popa, Auteur Année de publication : 2017 Article en page(s) : p. 42-52 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements Bois -- Vernis Durée de vie en pot Formulation (Génie chimique) Polyuréthanes Réduction des composés organiques volatils Réticulation (polymérisation) Revêtements sans isocyanates Rhéologie Solvants organiques Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Industrial wood surfaces, such as furniture and cabinetry, require coatings to help protect and extend their life. Polyurethane coatings provide enhanced appearance, stain and chemical resistance, as well as exterior durability. When formulated as ambient cure systems, traditional two-component polyurethanes typically must balance cure speed for pot life. This article describes clearcoat formulations using a novel nonisocyanate polyurethane technology based on the reaction of a polycarbamate with polyaldehydes. A major benefit of this system is the ability to decouple pot life and cure speed without adversely affecting fast hardness development and quick dry time. For the end user, this can lead to faster return to service and higher production rates. Additional coating benefits are high clarity, excellent durability and chemical resistance, and fast sandability. Reducing VOC is a major need for the applicator, and different approaches are presented aimed at reducing the VOC of a clear formulation for wood, which can maintain a useful pot life while retaining its fast cure and dry properties. An example is shown where a clear formulation is modified to meet the requirements of the Utah VOC Rule R307-343 Emission Standards for Wood Furniture Manufacturing Operations for acid-cure alkyd amino topcoats (1.0 lb solvent per lb of solid), which was chosen for its relatively higher VOC restriction. This is a traditional solventborne technology, and the current carbamate resin, which is in n-butyl acetate at 67% solids, can be formulated using exempt solvents as low as 450 g/L just meeting this standard. To reach more stringent VOC regulation targets below 450 g/L would require producing the carbamate resin dispersed in a VOC-exempt solvent. Note de contenu : - BACKGROUND : CHEMISTRY OF THE ISOCYANATE-FREE POLYURETHANE TECHNOLOGY - MATERIALS AND METHODS : Strategy - Viscosity - Film hardness and flexibility - Film curing/degree of crosslinking - RESULTS AND DISCUSSION : Survey of VOC-exempt solvents - Adjusting the % solids - Replacing ethanol with butanol - Other primary alcohols (propanol and methanol) En ligne : https://drive.google.com/file/d/1-DG1wkqHkp6CpjL5zSXdeE8mNNHKyn9K/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28870 [article]

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