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Waterborne acrylic-epoxy coatings / Charles R. Hegedus in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 927 (04/2002) . - p. 31-39 Titre : Waterborne acrylic-epoxy coatings Type de document : texte imprimé Auteurs : Charles R. Hegedus, Auteur ; Frank R. Pepe, Auteur ; John B. Dickenson, Auteur ; Frederick H. Walker, Auteur Année de publication : 2002 Article en page(s) : p. 31-39 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne two-component acrylic-epoxy coatings are gaining popularity as topcoats in moderate duty industrial and high performance architectural (HIPAC) applications. This increased popularity is due to their attractive handling, application, and performance properties, along with their low solvent content and odor. The objectives of this work were to characterize the cure and property development of these coatings, evaluate performance properties of cured films, and investigate a new epoxy resin dispersion in existing acrylic-epoxy formulations. These evaluations confirmed that existing acrylic-epoxy coatings have long pot life and short dry times while displaying a range of chemical resistance and physical properties. IR and differential scanning calorimetry (DSC) results indicated that the extent of cure at ambient conditions over a 21-day period was minimal; however, dynamic mechanical analysis (DMA) and solvent swell results did illustrate noticeable crosslink density development under these conditions. DSC results demonstrated more complete reaction and cure after heating. Direct substitution of a novel epoxy resin dispersion into these formulas resulted in lower required solvent content, shorter dry time, higher gloss, higher crosslink density, and improved water and scrub resistance. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5665 [article]

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UV curing of a pressure sensitive adhesive coating studied by real - time ftir spectroscopy and laboratory scale curing experiments / Armin Tauber in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 927 (04/2002) . - p. 41-47 Titre : UV curing of a pressure sensitive adhesive coating studied by real - time ftir spectroscopy and laboratory scale curing experiments Type de document : texte imprimé Auteurs : Armin Tauber, Auteur ; Tom Scherzer, Auteur ; Ingeborg Weib, Auteur ; Reiner Mehnert, Auteur Année de publication : 2002 Article en page(s) : p. 41-47 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Temps  réel  Transformation  Fourier  Spectrométrie  IR  Rayonnement  UV  Réticulation  Durcissement  Autoadhésif Index. décimale : 667.9 Revêtements et enduits Résumé : Real-time FTIR spectroscopy was used to study the UV-light induced crosslinking of a pressure sensitive adhesive based on a saturated acrylic polymer bearing a photoreactive functional group in the side chain. To simulate production parameters, e.g., cure speed and number of required UV lamps, single or multiple UV-light flash experiments were performed which have shown that the amount of crosslinked polymer chains in the adhesive depends on the applied UV dose. The same result was observed by varying the intensity of the UV-light. The properties of the pressure sensitive adhesive, e.g., peel and shear strength, were determined by UV curing using a laboratory irradiation unit. These results were compared with those of the RTIR spectroscopy experiments. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5666 [article]

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Cationic uv-cured coatings containing epoxidized soybean oil initiated by new onium salts containing tetrakis (pentafluorophenyl) gallate anion / Haiyan Gu in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 927 (04/2002) . - p. 49-52 Titre : Cationic uv-cured coatings containing epoxidized soybean oil initiated by new onium salts containing tetrakis (pentafluorophenyl) gallate anion Type de document : texte imprimé Auteurs : Haiyan Gu, Auteur ; Kangtai Ren, Auteur ; Dustin Martin, Auteur ; Thomas Marino, Auteur ; Douglas C. Neckers, Auteur Année de publication : 2002 Article en page(s) : p. 49-52 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Formulation  Amorceur  anionique  Réticulation  photochimique  Epoxydation  Huile  soja  Corps  gras  végétal  Rayonnement  UV  Durcissement  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Different formulations containing epoxidized soybean oil (ESO) and a commercial cycloaliphatic epoxy resin (UVR6110) were cured by onium tetrakis(pentafluorophenyl)gallate (Gallate) on steel panels. The resulting coatings were clear and their mechanical properties were tested by the Sward hardness test, cross-hatch tape adhesion test and MEK double rub test. The new initiators have the advantage of good solubility, high reactivity, and the production of colorless coatings. The best formulations obtained contain 50% ESO, 50% UVR6110, and 0.5% silwet if sulfonium gallate is used as initiator, and 60% ESO, 40% UVR6110, and 0.5% silwet if iodonium gallate is the initiator. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5667 [article]

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Electrochemical and salt spray analysis of multilayer ormosil / conversion coating systems for the corrosion resistance of 2024 - t3 aluminium alloys / Tammy L. Metroke in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 927 (04/2002) . - p. 53-61 Titre : Electrochemical and salt spray analysis of multilayer ormosil / conversion coating systems for the corrosion resistance of 2024 - t3 aluminium alloys Type de document : texte imprimé Auteurs : Tammy L. Metroke, Auteur ; Edward T. Knobbe, Auteur ; Olga Kachurina, Auteur Année de publication : 2002 Article en page(s) : p. 53-61 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : The corrosion resistance characteristics of multi-layer coating systems comprised of a conversion coating base layer and an organically modified silicate (ormosil) topcoat have been analyzed using salt spray and potentiodynamic polarization curve analyses. The effectiveness of the multilayer coating systems was found to depend on the presence of an electrochemically active species in the conversion coating and on the presence of a curing agent in the ormosil system. Multilayer coatings systems comprised of conversion coatings that contain active corrosion inhibitors were found to provide high degrees of corrosion protection. In all cases, the presence of the ormosil was found to enhance the corrosion resistance of the underlying conversion coating. The use of multilayer ormosil/ conversion coating systems enhances the corrosion protection of 2024-T3 aluminum alloy by combining previously developed corrosion protection methods with emerging sol-gel technology. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5668 [article]

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Analytical investigations on acrylic polyurethane hybrid - dispersions / H. Kagerer in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 927 (04/2002) . - p. 63-67 Titre : Analytical investigations on acrylic polyurethane hybrid - dispersions Type de document : texte imprimé Auteurs : H. Kagerer, Auteur ; H. U. Moritz, Auteur ; H. P. Rink, Auteur ; W. A. Jung, Auteur Année de publication : 2002 Article en page(s) : p. 63-67 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Analyse  chimique  Liaison  double  Copolymérisation  radicalaire  Matériau  hybride  Copolymère  greffé  Uréthanne  copolymère  Acrylate  Dispersion  aqueuse  Peinture  eau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Water-dispersible polyurethane acrylic graft copolymers are an important class of hybrid polymers for use as resins in waterborne coatings. In order to study fundamental properties of such polymers, a model system of four polyurethane macromonomers that differ in the average number of double bonds per molecule was developed. Free radical copolymerization of the polyurethane macromonomers with acrylates was carried out in aqueous phase using the polyurethanes as the reactive emulsifier. The stability of the product dispersions depends on the average number of double bonds per macromolecule and the weight ratio of hydrophilic polyurethane to the acrylic part. The content of the polyurethane double bonds and their conversion was measured by nuclear magnetic resonance (NMR) spectroscopy and by a titrimetrical method. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5669 [article]

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