New urethane diol resin modifiers for improved performance of aminoplast crosslinked coatings / Matthew Gadman in COATINGS TECH, Vol. 16, N° 2 (02/2019)  

[article]  inCOATINGS TECH > Vol. 16, N° 2 (02/2019) . - p. 34-46 Titre : New urethane diol resin modifiers for improved performance of aminoplast crosslinked coatings Type de document : texte imprimé Auteurs : Matthew Gadman, Auteur ; John Florio, Auteur ; Ravi Ravichandran, Auteur ; Steven Woltornist, Auteur Année de publication : 2019 Article en page(s) : p. 34-46 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aminoplastes Anticorrosion Diols Formulation (Génie chimique) Hexaméthoxy méthyl mélamine 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 Polyuréthanes Résistance à l'humidité Résistance au vieillissement Résistance aux brouillard salin Revêtements en phase aqueuse -- Additifs Solubilité Urethanes Index. décimale : 667.9 Revêtements et enduits Résumé : New water-soluble urethane diol resins have been developed to be used as resin modifiers for waterborne coatings systems crosslinked with amino resins. These urethane diols are a multipurpose chemical species that can be utilized to enhance performance properties as well as resolve some of the common issues experienced when formulating waterborne systems. The above-mentioned resin modifiers are water soluble without the presence of amine neutralizers, surfactants, or co-solvents. Incorporating these urethane diols will thus improve the water solubility of a resin system in a wet paint, subsequently reducing the need for neutralizing amines and additionally allowing for easier resin incorporation with less co-solvent requirements. As resin modifiers, the urethane backbone allows formulators to enhance performance of aminoplast crosslinked coatings by incorporating urethane groups into a crosslinked network without the use of an isocyanate. This work demonstrates the versatility of these urethane diols and further discusses how they can be used to enhance coating performance by improving corrosion and humidity resistance, as well as increasing hardness while maintaining flexibility. Note de contenu : - INTRODUCTION : Waterborne polyester formulations crosslinked with amino resins - Formulating with melamine crosslinkers - Necessity and effects of amine in PE/HMMM coatings - Polyurethane coatings - Urethane linkages in melamine coatings - Pursuit of non-VOC coatings : the rise of aqueous formulations and their limitations - Urethane diols for modifying aqueous formulations crosslinked with amino resins - EXPERIMENTAL : Experiment I : crosslinking capabilities of urethane diols with amino resins - Experiment II : reactivity of 1° vs 2° hydroxyl functional urethane diol - Cure response - Thermal gravimetric analysis - Experiment III : acid etch resistance of diol D modified white pigmented polyester coating - Experiment IV : diol a modifications of WB PE crosslinked with HMMM - Amine required for neutralization - Solids, water, and VOC content - Film properties - Moisture resistance - Salt fog resistance - Age stability - Table 1 : Physical properties of urethane diols - Table 2 : Physical properties of saturated polyesters - Table 3 : White pigmented water thinnable PE grind - Table 4a : Formulation components of white pigmented water-thinnable PE - Table 4b : Characteristics of white pigmented PE formulation - Table 5 : Acid Etch resistance of diol D modified white PE formulations - Table 6a : Formulation 1 : Clear water-reducible PE-HMMM - Table 6b : Characteristics of formulation 1 - Table 7a : Formulation II : Clear water-diluable PE-HMMM - Table 7b : Characteristics of formulation II - Table 8a : Formulation II : White (Tio2) water-thinnable PE-HMMM - Table 8b : Characteristics of formulation III - Table 9 : Appearance of formulation 1 at start of titration - Table 10 : DMEA content of formulations I and II - Table 11 : Test specifications for film property tests - Table 12 : Appearance recovery after 215 h of humidity exposure - Table 13 : Film appearance after 1500 h of humidity exposure - Table 14 : Film appearance after salt fog exposure - Table 15 : Film appearance after salt fog exposure - Table 16 : Formulation 1 pot appearance upon aging - RT, 50°C and 60°C En ligne : https://drive.google.com/file/d/1vkvHYKZ7oV59ZkEupyjg8q1fUyST1R1x/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31853 [article]

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Novel metal-free catalysts for epoxy carboxy coatings / Ravi Ravichandran in COATINGS TECH, Vol. 16, N° 3 (03/2019)  

[article]  inCOATINGS TECH > Vol. 16, N° 3 (03/2019) . - p. 28-40 Titre : Novel metal-free catalysts for epoxy carboxy coatings Type de document : texte imprimé Auteurs : Ravi Ravichandran, Auteur ; Michael Emmet, Auteur ; Matthew Gadman, Auteur ; John Florio, Auteur ; Steven Woltornist, Auteur Année de publication : 2019 Article en page(s) : p. 28-40 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Vernis Catalyseurs Essais accélérés (technologie) Essais de résilience Essais dynamiques Formulation (Génie chimique) Polyacryliques Réticulation (polymérisation) vernis en phase solvant Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : A new class of metal-free catalysts has been developed that promotes the crosslinking reaction of epoxy functional polymers with carboxyl functional compounds and polymers. Particularly effective at much lower cure temperatures, these catalysts provide stable single package formulations and improved resistance properties. In addition, unlike amine-based cmpounds, these catalysts do not yellow during cure or on over-bake. Note de contenu : - INTRODUCTION : Epoxy acid automotive clearcoats - Epoxy acid-based powder coatings - Binder, crosslinking chemistry, and catalysis - EXPERIMENTAL : Experiment I : catalyst studies on NACURE XC-324 in a 1K SP epoxy/carboxy clearcoat (Materials and preparation of 1K SB epoxy/carboxy clearcoat formulation - Film preparation of 1K SB epoxy/carboxy clearcoats - Film properties of catalyzed clearcoats - Viscosity stability of epoxy carboxy liqiud coatings - Gel fraction studies - QUV resistance of catalyzed epoxy carboxy coatings - Humidity exposures of catalyzed epoxy carboxy coatings - Crickmeter abrasion - Overbake resistance) - Experiment II : Catalyst studies on NACURE XC-355 in a 2K SB epoxy/carboxy clearcoat (materials and preparation of 2K SB/epoxy carboxy clearcoat formulation - Film preparation of 2KSB epoxy/carboxy clearcoat - Film preparation of HMMM crosslinked acrylic and epoxy/carboxy clearcoats - Cure response of acrylic OH/HMMM and acrylic COOH/GMA - Environmental etch comparison of acrylic OH/HMMM vs acrylic COOH/GMA - Fig. 1 : Epoxy carboxy crosslinking reaction - Fig. 1a : Viscosity stability of epoxy/carboxy SB coatings (60°C storage) - Fig. 1b : Viscosity stability of epoxy/carboxy SB coatings (50°C storage) - Fig. 1c : Viscosity stability of epoxy/carboxy SB coatings (ambient storage) - Fig. 2 : Percent weight retention after 6h of reflux with acetone/metanol (1/1) - Fig. 3 : Yellowness measurements after QUV exposure - Fig. 4 : Change in gloss following crockmeter abrasion - Fig. 5 : Yellowing (b*) and total color (E*) change of clearcoats after overbake - Fig. 6 : Oscillation curve of complet viscosity and temperature as a function of time - Fig. 7 : MEK resistance of hardness of epoxy/acid clearcoats-100°C/30 min bake - Table 1 : Classes of available catalyst technologies - Table 2 : 1K SB epoxy/carboxy clearcoat - Table 3a : Film properties of carboxy functional acrylic and GMA epoxy-120°C/30 min - Table 3b : Film properties of carboxyl functional acrylic and GMA epoxy - 110°C/30 min - Table 4 : Viscosity stability of epoxy carboxy liquid coatings (60°C/16 h) - Table 5 : Gel fraction studies after 6h Soxhlet extraction with acetone/methanol (1/1) - Table 6 : Yellowness measurements after QUV exposure-b*values - Table 7 : Yellowness measurements after QUV exposure-Δ*values - Table 8 : Humidity exposures of catalyzed epoxy/carboxy coatings-Blister ratings - Table 9 : Visual rating for crockmeter tests-0-R rating - Table 10 : Images with visual rating and change in gloss following crockmeter abrasion - Table 11 : Change in color values of catalyzed clearcoats after overbake - Table 12 : 2K solventborne epoxy/carboxy clearcoat - Table 13a : Pre-experiment steps for oscillation tests - Table 13b : Protocol for oscillation tests - Table 14 : Film properties of carboxyl functional acrylic and GMA epoxy-100°C/30 min - Table 15 : Yellowing resistance follwing 100°C/30 min overbake - Table 16 : Total color change following 100°C/30 min overbake - Table 17 : (a) Hydroxyl functional acrylic/HMMM vs (b) acid functional acrylic/GMA epoxy - Table 18 : MEK resistance of (a) acrylic OH/HMMM vs (b) acrylic COOH/GMA - Table 19 : Acid etch resistance of (a) acrylic OH/HMMM vs (b) acrylic COOH/GMA En ligne : https://drive.google.com/file/d/1hbklMv6qE5mymZKYqIQ2MXKYVZtkH1VA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32045 [article]

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