Addressing single-layer protective coatings / Goeffrey R. Webster in EUROPEAN COATINGS JOURNAL (ECJ), N° 12 (12/2018)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 12 (12/2018) . - p. 42-47 Titre : Addressing single-layer protective coatings : A new resin for improved direct-to-metal coatings has been developed Type de document : texte imprimé Auteurs : Goeffrey R. Webster, Auteur ; Gianluigi Cassin, Auteur ; Jens Duereth, Auteur ; Curt Cleven, Auteur ; Todd Wallis, Auteur Année de publication : 2018 Article en page(s) : p. 42-47 Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Application directe sur le métal Essais de brouillard salin Fourier, Spectroscopie infrarouge à transformée de Homopolymères Métaux -- Revêtements protecteurs Photo-oxydation Polyacryliques Polyesters Résistance à l'hydrolyse Résistance aux conditions climatiques Index. décimale : 667.9 Revêtements et enduits Résumé : A great many DTM coatings have difficulty providing weatherability or corrosion performance or both. Direct-to-metal coatings formulated with resins made using 2,2,4,4-tetramethyl-1,3-cyclobutanediol not only are rugged and deliver bestin-class weathering and corrosion resistance but can also be a potential replacement for 2-coat systems. Note de contenu : - Identifying a persistent problem - A new solution - Hydrolysis resistance - Moisture barrier - Corrosion resistance - Weathering resistance - Fig. 1 : 2,2,4,4-tetramethyl-1,4-cyclobutanediol monomer (TMCD) - Fig. 2 : Comparison of hydrolysis of homopolymers - Fig. 3 : Coatings - 36 day 50% H2SO4 exposure : PE coating with no TMCO ; centre : the same resin with partial replacement of the glycol by TMCO and 100% of the glycol replaced by TMCO - Fig. 4 : Water vapour transmission rates (ASTM E-96) of a coating prepared with "Tetrashield PC4000" to a standard protective coating of acrylic polyol crosslinked with "Desmodur 3390" - Fig. 5 : 500 hours ASTM B117 corrosion over shot blasted steel. 2,2,4,4-tetramethyl 1,4-cyclobutanediol 2K coating and commercial acrylic. For testing, the panels were removed from the salt fog chamber, allowed to dry for a minimum of 12 hrs., then immersedin hot tap water for 30 minutes followed by scraping with a steel spatula to remove all loose paint - Fig. 6 : Xenon ASTM 2527 accelerated weathering of "Tetrashield" resins compared to conventional polyesters and commercial acrylics - Fig. 7 : FTIR spectra of unweathered and weathered coatings showing the NH OH and CH stretch region - Fig. 8 : Plot of POV vs. time in xenon for conventional polyesters, "Tetrashield" resins and conventional acrylics in refinish clearcoat formulations - Fig. 9 : Rate of photo-oxidation by IR spectroscopy. Lower rate indicates better weathering - Table 1 : Homopolymers prepared for hydrolysis testing En ligne : https://drive.google.com/file/d/1ECUdCGhb8mphL0JaxP4UVC3GBRPnj39n/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31508 [article]

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A versatile, high-performance polyol chemistry for broad industrial market use / Jamie Dzickowski in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4647 (12/2018)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4647 (12/2018) . - p. 15-18 Titre : A versatile, high-performance polyol chemistry for broad industrial market use Type de document : texte imprimé Auteurs : Jamie Dzickowski, Auteur ; Sandra Case, Auteur ; Gianluigi Cassin, Auteur ; Jeremy Lizotte, Auteur ; Geoff Webster, Auteur Année de publication : 2018 Article en page(s) : p. 15-18 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Can coating Formulation (Génie chimique) Liants Polyesters Polyols Polyuréthanes Revêtements -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Polyester polyol chemistry has been used extensively as a binder option in high performance industrial coatings applications for decades. Limitations of traditional polyester technology, such as weathering and chemical resistance have restricted its use to a co¬binder due to the high level of performance requirements associated with these markets. Translating the use of a speciality monomer from copolyesters for thermoplastic applications, chemists at Eastman have evaluated the effectiveness of a unique glycol molecule as a building block in copolyester coatings resins targeted for use in automotive coatings, metal packaging applications for food cans and industrial applications like the agricultural and construction segment. Proven to enhance the hydrolytic stability and offer a balance of flexibility and hardness, the speciality polyol is enabling distinctive binder properties to address ever-changing global coatings needs. Fulfilling performance targets across very diverse fitness for use criterion, this paper capitalises on the versatility of the speciality polyol platform of resins.Through performance comparisons to next best alternative technologies, the improved durability will highlight the advantage of this next generation of polyol chemistry. Note de contenu : - Metal packaging applications - Table 10 : Resin series used to evaluate novel polyol performance in metal food packaging applications - Table 11 : Target CTQ for resin design to address metal packaging market needs - Table 12 : Basic white polyurethane screening formulation for can coatings applications - Table 13 : White polyurethane screening formulation physicals and test results - Table 14 : White hybrid/polyurethane/benzoguanamine screening formulation for can coatings applications - Table 15 : hite screening formulation physicals and test results of MP-1 for different crosslinker packages - Fig. 12 : Below L. Fabrication representation by Erichsen cup couplet with 3% acetic acid simulant resistance of white polyurethane coatings - Fig. 13 : Below R. Fabrication representation by Erichsen cup coupled with 3% acetic acid simulant resistance of white polyurethand and hybrid coating formulations - Fig. 14 : Cathodic disbonding test system and results of exposed coated pressed can lids of white polyurethane coatings with the MP-1 and the control - Fig. 15 : Polyester resin space broken-down by functionality, functional groups and molecular weight ranges En ligne : https://drive.google.com/file/d/1BqW9lA4L1699vqNvQkJoeJM9ccXvYWpG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31513 [article]

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A versatile, high-performance polyol chemistry for broad industrial market use / Jamie Dziczkowski in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 208, N° 4646 (11/2018)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4646 (11/2018) . - p. 20-25 Titre : A versatile, high-performance polyol chemistry for broad industrial market use Type de document : texte imprimé Auteurs : Jamie Dziczkowski, Auteur ; Sandra Case, Auteur ; Gianluigi Cassin, Auteur ; Jeremy Lizotte, Auteur ; Geoff Webster, Auteur Année de publication : 2018 Article en page(s) : p. 20-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Revêtements Automobiles -- Revêtements:Automobiles -- Peinture Automobiles -- Vernis Composés organiques volatils Durée de vie en pot Formulation (Génie chimique) Glycols Un glycol ou diol est un composé chimique organique portant deux groupes hydroxyle (-OH). Lorsque les deux groupes hydroxyle sont portés par le même atome de carbone, on parle de diol géminal. Parmi ceux-ci, on compte par exemple le méthanediol (H2C(OH)2) ou le 1,1,1,3,3,3-hexafluoropropane-2,2-diol ((F3C)2C(OH)2), la forme hydratée de l'hexafluoroacétone. On parle de diol vicinal lorsque les deux groupes hydroxyle sont en position vicinale, c'est-à-dire attachés à des atomes de carbone adjacents. On compte parmi ceux-ci l'éthane-1,2-diol ou éthylène glycol (HO-(CH2)2-OH), un composant courant des produits antigels ou le propane-1,2-diol (propylène glycol, HO-CH2-CH(OH)-CH3). Parmi les composés avec des groupes hydroxyles bien plus éloignés on compte le butane-1,4-diol (HO-(CH2)4-OH) ou encore le bisphénol A. Polyesters Polyols Réactions chimiques Résistance aux conditions climatiques Résistance chimique Revêtements (produits chimiques):Peinture (produits chimiques) Vernis bi-composant Index. décimale : 667.6 Peintures Résumé : Polyester polyol chemistry has been used extensively as a binder option in high performance industrial coatings applications for decades. Limitations of traditional polyester technology, such as weathering and chemical resistance have restricted its use to a co-binder due to the high level of performance requirements associated with these markets. Translating the use of a speciality monomer from copolyesters for thermoplastic applications, chemist at Eastman have evaluated the effectiveness of a unique glycol molecule as a building block in copolyester coatings resins targeted for use in automotive coatings, metal packaging applications for food cans and industrial applications like the agricultural and construction segment. Proven to enhance the hydrolytic stability and offer a balance of flexibility and hardness, the speciality polyol is enabling distinctive binder properties to address ever-changing global coatings needs. Fulfilling performance targets across very diverse fitness for use criterion, this paper capitalises on the versatility of the speciality polyol platform of resins. Through performance comparisons to next best alternative technologies, the improved durability will highlight the advantage of this next generation of polyol chemistry. Note de contenu : - Existing polyol technology - Speciality polyol design - Automotive and industrial applications - Table 1 : Common polyol chemistries used in liquid OEM coatings applications - Table 2 : Newman's empirical steric factors and material characteristics of common glycols - Table 3 : End use application and coating details for evaluating speciality polyester polyol performance - Table 4 : Target CTQ to address automotive monocoat and industrial topcoat market needs - Table 5 : Resin series used to evaluate novel polyol performance in two-component top application - Table 6 : White two-component formulations to evaluate performance in topcoat applications - Table 7 : Chemical resistance of various white topcoat chemistries - Table 8 : Cure response and pot-life for different industrial applications adjusted by catalyst selection - Table 9 : VOC ranges for two-component topcoats formulated with the speciality polyol IC-1 - Fig. 1 : Representative reaction of a polyol with melamine resin chemistry - Fig. 2 : Mechanism of thermosetting polyol/isocyanate reaction to form urethane linkage - Fig. 3 : Reaction of phenolic resin with polyol to create C-C linkage within the themoset - Fig. 4 : Chemical structure of 2,2,4,4-tetramethyl-1,3-cyclobutane diol (TMCD) - Fig. 5 : Newman's empirical steric factors and material characteristics of common glycols - Fig. 6 : Experimental half-life of model diesters after catalysed exposure to accelerated conditions - Fig. 7 : Improved chemical resistance trend with increasing levels of TMCD monomer in total diol in a two-component topcoat coating system - Fig. 8 : Common liquid OEM automotive and industrial paint layers and paint layer functions - Fig. 9 : Weathering resistance, QUV-A exposure of white topcoat systems at 2500hr - Fig. 10 : Salt spray resistance (840 hr) as measured by ASTM B117. The paint on right side of scribe (X) was removed to highlight undercut corrosion. The topcoat was applied directly to the metal (SP10 shot blasted steel) - Fig. 11 : Improved resistance of TMCD poyol-based coatings to Skydrol and brake fluid En ligne : https://drive.google.com/file/d/1vrYwpBiYJlEyNcFzbeadoe2gcWgovDet/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31575 [article]

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