Cure behavior of polyester-acrylate hybrid powder coatings / Alan Toman in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 893 (06/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 893 (06/1999) . - p. 69-75 Titre : Cure behavior of polyester-acrylate hybrid powder coatings Type de document : texte imprimé Auteurs : Alan Toman, Auteur ; Sarla Goel, Auteur ; E. D. Dumain, Auteur ; Tetsuro Agawa, Auteur ; Albert S. Tse, Auteur Année de publication : 1999 Article en page(s) : p. 69-75 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides carboxyliques Analyse thermique Epoxydes Isocyanurate de triglycidyle Polyacrylates Polyesters Réticulation (polymérisation) Revêtements poudre:Peinture poudre Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Interest in finding alternatives to TGIC-based powder coatings have driven development of alternate binders for the exterior durable powder coating market. Thermoset powder coatings utilizing carboxylic acid functional polyester resins cared with epoxide-functional acrylate polymers have been evaluated and characterized. Modification of the composition and molecular weight of either component influences the physical properties of formulated powder coating. The behavior of these coatings during the cure process has been investigated and compared with polyester/TGIC. systems. Note de contenu : - INTRODUCTION : Acrylate-cured polyester powder coatings - EXPERIMENTAL : Powder coating formulation and processing - Coating characterization methods - RESULTS AND DISCUSSION : Polyester - GMA acrylic - Thermal analysis - Chemorheology - Microscopy Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17877 [article]

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Effect of surface treatments of titanium dioxide pigments on the cure of polyester/triglycidyl isocyanurate powder coatings / Stanley Affrossman in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1053-1064 Titre : Effect of surface treatments of titanium dioxide pigments on the cure of polyester/triglycidyl isocyanurate powder coatings Type de document : texte imprimé Auteurs : Stanley Affrossman, Auteur ; Anthony McKee, Auteur ; Richard A. Pethrick, Auteur Année de publication : 2015 Article en page(s) : p. 1053-1064 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique Dioxyde de titane Isocyanurate de triglycidyle Pigments inorganiques Polyesters Revêtements poudre Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Titanium dioxide pigments will typically have an inorganic surface coating based on a blend of alumina and silica and an organic treatment. Both the organic and inorganic treatments can influence the cure characteristics of polyester powder coatings. This paper attempts to explore the connectivity between the nature of the coating and the cure behavior of a typical heat-cured epoxidized isocyanurate formulation. It is found that a high silica:alumina content in the inorganic pacification layer significantly retards the cure process, but is influenced by the nature of the organic treatment. The organic surface treatment may accelerate or retard the initial cure process and gelation times. Elemental analysis indicates that some of the pigments studied have a significantly higher zirconium content and exhibited enhanced cure rates compared with those with the lower zirconium content. This paper illustrates the potential effects of different grades of titanium dioxide on the cure of polyester powder coatings. Note de contenu : - EXPERIMENTAL : Materials - Titanium dioxide pigments - Surface area measurements - Powder coating production - Strathclyde curometer - Thermally stimulated discharge measurements - Dynamic mechanical thermal analysis - RESULTS AND DISCUSSION : Curometer measurements - Effects of organic surface treatment of the pigment on the cure behavior - Trimethyol propane (TMP)- Triethylamine (TEA) - Trimethyol propane (TMP)/polyethylene wax - Modaflow effects on cure - Effect of pigment loading in a Modaflow-free coating - Effect of pigment loading with 1% Modaflow being present - Effect of pigment loading with 4% Modaflow being present - Conclusion from the curometer study - Thermally stimulated discharge spectroscopy TSD - Dynamic mechanical thermal analysis DOI : 10.1007/s11998-015-9697-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9697-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24957 [article]

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Hybrid powders : scratch resistance and good flow in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 12, N° 1 (2019)

[article]  inINTERNATIONAL SURFACE TECHNOLOGY (IST) > Vol. 12, N° 1 (2019) . - p. 30-31 Titre : Hybrid powders : scratch resistance and good flow Type de document : texte imprimé Année de publication : 2019 Article en page(s) : p. 30-31 Langues : Anglais (eng) Catégories : Epoxydes Isocyanurate de triglycidyle Matériaux hybrides Polyesters Résistance à l'abrasion Résistance aux conditions climatiques Revêtements poudre:Peinture poudre Index. décimale : 667.9 Revêtements et enduits Résumé : Modern hybrid powder coatings produce a finish that is highly resistant to scratching. A new product combines this tough surface with good levelling properties and efficient processing. Note de contenu : - Tough and weather-resistant - Adding functions to powder coatings - Gloss retention of up to 70 percent Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32053 [article]

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Replacements for TGIC in powder coatings / Carl Appelgren in EUROPEAN COATINGS JOURNAL (ECJ), N° 03/01 (03/2001)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 03/01 (03/2001) . - p. 120-125 Titre : Replacements for TGIC in powder coatings Type de document : texte imprimé Auteurs : Carl Appelgren, Auteur ; Amy Forsgren, Auteur Année de publication : 2001 Article en page(s) : p. 120-125 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Anticorrosion Brillance (optique) Elasticité Isocyanurate de triglycidyle Métaux -- Revêtements protecteurs Polyacryliques Produits chimiques -- Suppression ou remplacement Réticulants Revêtement métallique Revêtements poudre:Peinture poudre Index. décimale : 667.9 Revêtements et enduits Résumé : Due to environmental problems, the powder coatings crosslinker TGIC is under discussion, and research efforts are undertaken to fine suitable alternatives. In this work, formulations from various coatings manufacturers, using four of these alternative substances, were tested with respect to their corrosion protection, adhesion, gloss, elasticity and application parameters. Their performance was comparable to that of TGIC-formulations. Note de contenu : - EXPERIMENTS : 11 powder coating formulations - Iron and zinc-manganese phosphated steel substrates - WATERBORNE ACRYLIC ANTICORROSIVE PRIMER - LABORATORY TESTING OF ADHESION, GLOSS, ELASTICITY, APPLICATION, AND CURING : Field testing - RESULTS AND DISCUSSION : TGIC formulations do not protect significantly better than alternatives - Primer can deteriorate the corrosion protection - Widely scattering adhesion performance - cohesive failure in the primer - Highest gloss with TGIC - Elasticity depends on both primer and topcoat - Alternative curing agents take up more change En ligne : https://drive.google.com/file/d/1OnJEUIz9Efx3BqqjRI8VuZMskI0xnB8r/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24211 [article]

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Unique catalyst for low temperature cure epoxy powder coatings / Matthew Gadman in COATINGS TECH, Vol. 20, N° 1 (01-02/2023)  

[article]  inCOATINGS TECH > Vol. 20, N° 1 (01-02/2023) . - p. 18-33 Titre : Unique catalyst for low temperature cure epoxy powder coatings Type de document : texte imprimé Auteurs : Matthew Gadman, Auteur ; John Florio, Auteur ; Matt C. Salvi, Auteur Année de publication : 2023 Article en page(s) : p. 18-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Basses températures Bisphénol A Blanc (couleur) Catalyseurs Epoxydes Formulation (Génie chimique) Homopolymères Isocyanurate de triglycidyle Méthacrylate de glycidyle Polyacryliques Réticulation (polymérisation) Revêtements bi-composant Revêtements organiques Revêtements poudre Rhéologie Stabilité au stockage Thermodurcissables Index. décimale : 667.9 Revêtements et enduits Résumé : Powder coatings continue to ba an attractive technology, primarily due to reduced volatile organic compound (VOC) emissions, ability to recycle overspray, and the exceptional film mechanical properties that can be attained. Despite the appeal, there are major drawbacks that need to be resolved for the technology to be effectively substitutable for liquid coatings. Note de contenu : - POWDER HISTORY AND TODAY'S MARKET : Launch of thermoset powder technology-innovation and low VOC initiatives : Circa 1950-1990 - Continued growth in a variety of markets-postmillennial - Environmentally aware consumers and VOC regulations : contemporary market - A REVIEW OF THERMOSET POWDER TECHNOLOGIES : 1. Epoxy hybrids - 2. TGIC coatings (polyester) - 3. Acrylic systems - 4. Pure epoxy formulations - CATALYSTS FOR EPOXY POWDER COATINGS : - EXPERIMENTAL : Experiment I : Cure capabilities in acrylic/GMA-SB and pwoder formulations - Formulations, materials, and preparation of 2K SB acrylic/GMA and pwder acrylic/GMA - Rheology studies of 2K SB acrylic/GMA and pwder acrylic/GMA - EXPERIMENT II : Accelerating epoxy homopolymerization : Formulations, materials, and preparation of catalyzed epoxy resins - Rheology studies of catalyzed BPA epoxy resins - EXPERIMENT III : EVALUATION OF CATALYST PC IN FULLY FORMULATED WHITE EPOXY HYBRID POWDER : Formulations, materials, and preparation of white epoxy hybrid - Rheology studies of white epoxy hybrid - Film preparation of white epoxy hybrid - Film evaluation of white epoxy hybrid - Storage stability - EXPERIMENT IV : EVALUATION OF CATALYST PC IN FULLY FORMULATED WHITE TGIC POWDER : Formulations, materials, and preparation of white TGIC formulation - Rheology studies of white TGIC formulation - Film preparation of white TGIC formulation - Film evaluation of white TGIC formulation - Storage stability - Fig. 1 : Bisphenol-1 type epoxy resins, n ≥ 0 - Fig. 2 : Hydroxy ester formation via reaction of epoxides and carboxyl groups - Fig. 3 : Triglycidylisocyanurate (TGIC) crosslinker - Fig. 4 : Glycidyl methacrylate (GMA) monomer - Fig. 5 : Dicyandiamide (DICY) crosslinker - Fig. 6A : Initiating epoxy/amine polymerization - Fig. 6B : Epoxy homopolymerization via catalysis by tertiary amine - Fig. 6C : Deprotonation of hydroxyls and subsequent reactions with epoxy - Fig. 6D : Amide formation via reaction of hydroxyl with nitrile - Fig. 7A : Base catalysis : deprotonation of carboxylic acid* - Fig. 7B : Base catalysis : interaction of conjugate acid with epoxide oygen - Fig. 8 : Preparing powder disks using cylindrical pellet press - Fig. 9 : Catalyst LC gel temperature in S B and powder acrylic/GMA system - Fig. 10 : Log (lη*l) as a function of temperature : increasing dosages of catalyst LC - Fig. 11 : Gel temperatures of white epoxy hybrid - Fig. 12 : MEK resistance of white epoxy hybrids baked at various temperatures - Fig. 13 : Impact resistance of white epoxy hybrid baked at various temperatures for 15 mn - Fig. 14 : ΔΕ of catalyzed versus uncatalyzed white epoxy hybrid - Fig. 15 : Pendulum and pencil hardness of white epoxy hybrid-bake temp./ 15 mn - Fig. 16 : Log (lη*l) as a function of temperature-white TGIC formulation - Fig. 17 : Impact resistance of white TGIC formluation - % active catalyst on TRS - Fig. 18 : Gloss and color of white TGIC formulation-60° GU and b* - Table 1 : Commonly used catalysts for epoxy reaction with carboxylic acids - Table 2 : Physical properties of catalyst LC and catalyst PC - Table 3 : 2K SB acrylic/GMA formulation - Table 4 : Powder acrylic/GMA formulation - Table 5A : Pre-experiment steps for SB oscillation tests - Table 5B : Protocol for SB oscillation tests - Table 6A : Pre-experiment steps for powder oscillation tests - Table 6B : Protocol for powder oscillation tests - Table 7 : Solventless BPA epoxy resin - Table 8A : Pre-experiment steps for solventless epoxy oscillation tests - Table 8B : Protocol for solventless oscillation tets - Table 9 : Gel temp and onset temp of BPA epoxy resin with catalyst LC - Table 10A : Breakdown of components of uncatalyzed white epoxy hybrid - Table 10B : % breakdown of uncatalyzed and catalyzed white epoxy hybrid - Table 11A : Pre-experiment steps for white epoxy hybrid oscillation tests - Table 11B : Protocol for white epoxy hybrid oscillation tests - Table 12 : Color values of white epoxy hybrid : L*, a*, b* - Table 13 : Gloss properties of white epoxy hybrid-60° gloss units (GU) - Table 14 : Uncatalyzed white TGIC formulation En ligne : https://drive.google.com/file/d/1geR64CGC-_890pO1tV9GH-iQvIM2r4Eg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38714 [article]

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