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[article]
Titre : Rapid Protection : Fast-curing polycarbamide system creates low VOC direct-to-metal (DTM) finishes Type de document : texte imprimé Auteurs : Sudhir Ananthachar, Auteur Année de publication : 2017 Article en page(s) : p. 18-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Application directe sur le métal
Formulation (Génie chimique)
Liants
Métaux -- Revêtements protecteurs
Polyaspartiques
Polycarbamide
Polyisocyanates
Résistance chimique
Réticulants
Revêtement -- Séchage
VernisIndex. décimale : 667.9 Revêtements et enduits Résumé : A new polycarbamide-isocyanate binder system was compared with 2K PU coatings in both DTM anticorrosive and topcoat formulations. Performance was similar, but with faster drying and considerably lower VOCs. Advantages were also found over polyaspartics. Note de contenu : - Limitations of 2K PU coatings in DTM applications
- Basic properties of the polycarbamide curing agents
- Faster drying and lower VOCs achieved
- Corrosion and chemical resistance comparable to 2K PU
- Topcoat compared with acrylic urethane system
- Some advantages also shown over polyaspartics
- A broad spectrum of property improvements
- TABLES : 1. Gel times and typical physical properties of PCA1 and PCB1 - 2. Typical physical properties of aliphatic polyisocyanate resin - 3. DTM and pigmented topcoat formulations - 4. Pigmented acrylic polyol topcoat formulation - 5. DTM coatings : performance properties of PCA1 - 6. DTM corrosion performance on cold-rolled steel - 7. Chemical resistance spot tests on DTM coatings - 8. Performance properties of polycarbamide and acrylic urethane topcoats
- FIGURES : 1. Key moieties within the polymeric crosslinked systems polycarbamide and polyurethane - 2. Pot life of polycarbamides compared - 2. Polycarbamide DTM coatings, 500h corrosion resistance. Left, iron phosphated steel ; centre, zinc phosphated steel ; right sand blasted steel - 4. Polycarbamide DTM and 2K polyurethane DTM, 500h corrosion resistance over cold rolled steel and polycarbamide and 2K:PUEn ligne : https://drive.google.com/file/d/11tjaIZS9mp7t7TJ57vnlNS2HaSyH_PBT/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27819
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 2 (02/2017) . - p. 18-24[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18679 - Périodique Bibliothèque principale Documentaires Disponible Reducing wood curing costs / Robert A. Wade in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4489 (06/2005)
[article]
Titre : Reducing wood curing costs Type de document : texte imprimé Auteurs : Robert A. Wade, Auteur ; Michael J. Dvorchak, Auteur ; Chirstopher Irle, Auteur Année de publication : 2005 Article en page(s) : p. 46-48 Langues : Anglais (eng) Catégories : Bois -- Finition
Carbodiimides
Coût -- Contrôle
Dispersions et suspensions
Photoréticulation
Polyisocyanates
Polyuréthanes
Vernis -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : This article explains how UV-curable polyurethane dispersions in wood coatings reduce the investment in costs in UV equipment.
Radiation curable coatings have been used in the wood coatings industry for several years. To improve productivity in many applications, flat substrates are coated, e.g. in hardwood flooring or the furniture industry. Major benefits of a photopolymerisation are the high curing speed and high crosslink density. High performance coatings with excellent abrasion as well as chemical resistance are obtained.
When complex substrates must be coated there is always the concern of uncured surfaces in shadow areas. Typically, more expensive UV-equipment that optimises a homogeneous radiation exposure is necessary. In addition, only high throughput lines make an investment in UV curing equipment affordable. The high investment costs were seen for years as the biggest hurdle for an industrial coater before entering into UV curing technology.
A new coatings system based on UV-PUD's can be cured with low energy UV-A lights, without sacrifice of performance properties for wood coatings applications. These types of lamps are significantly cheaper in their investment costs as well as in their maintenance. Coatings performances will discussed with special respect to low intensity UV-A lamps, UV-curing PUD's, and the effect of adding self-crosslinking dispersions. The effects of adding water-dispersible polyisocyanates and carbodiimide crosslinkers to such coatings are also presented.Note de contenu : - UV curing and UV equipment
- Radiation curing dispersions
- Low-intensity UV-cured water-borne coatings
- FIGURES : 1. UV-A lamp spectral output with blue filters (wavelength in nm) - 2. Building blocks of UV-curing polyurethane dispersions - 3. Hardness properties at various cure conditions - 4. Chemical resistance properties at various cure conditions - 5. Hardness and chemical resistance with addition of carbodiimide crosslinker (system B) - 6. Staining resistance of dual cure waterborne UV pigmented coatings Din 68861 1b, 5 = pass, 0 = fail - 7. Hardness development of dual cure waterborne UV pigmented coatingsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27637
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 195, N° 4489 (06/2005) . - p. 46-48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002059 - Périodique Bibliothèque principale Documentaires Disponible Scratch and recovery characteristics of automotive clearcoats containing blocked polyisocyanate crosslinkers / Seung Man Noh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 1 (01/2015)
[article]
Titre : Scratch and recovery characteristics of automotive clearcoats containing blocked polyisocyanate crosslinkers Type de document : texte imprimé Auteurs : Seung Man Noh, Auteur ; Joon Hyun Nam, Auteur ; Jung Kwon Oh, Auteur ; Hyun Wook Jung, Auteur Année de publication : 2015 Article en page(s) : p. 85-95 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Vernis
Caractérisation
Echantillonnage
Polyisocyanates
Polymères à silane modifié
Résistance à l'abrasion
Réticulation (polymérisation)Index. décimale : 667.9 Revêtements et enduits Résumé : Scratch characteristics and self-recovery behaviors of automotive clearcoats including newly designed silane-modified blocked polyisocyanate (SMBI)1 as an organic–inorganic hybrid crosslinker were compared with those with the commercially well-known crosslinkers such as blocked HDI-based and blocked IPDI-based polyisocyanates. To extensively scrutinize the effects of various crosslinkers with different chemical structures on the chemical and mechanical properties of clearcoats themselves, rigid-body pendulum tester analysis, creep-recovery analysis, and FTIR analysis were performed, resulting in a noticeable variation in curing features and crosslinking networks. Employing the overall coating systems by depositing clearcoats with different crosslinkers above the same undercoats on galvanized steel, the scratch behaviors on the surface of the outermost clearcoat layer were examined via the nano-scratch tester for scratch depth profiles and atomic force microscopy for three-dimensional scratch images, under various self-reflow temperatures and duration time periods. The results demonstrated that the SMBI crosslinker induced a considerably higher degree of crosslinked networks, through the reaction of urethane bonds and silanol bonds in clearcoats, in comparison with the blocked HDI and IPDI polyisocyanates. Also, the recoverable behaviors of scratched clearcoats containing different blocked polyisocyanates were affected by the intrinsic chemical structures of crosslinkers, as well as scratch-recovery conditions such as external temperatures and duration times. Note de contenu : - EXPERIMENTAL : Preparation of clearcoat samples - Characterization methods
- RESULTS AND DISCUSSION : Curing analysis by RPT - FTIR analysis - Creep-recovery properties - Scratch resistance and recovery characteristicsDOI : 10.1007/s11998-014-9617-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9617-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23209
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 1 (01/2015) . - p. 85-95[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16952 - Périodique Bibliothèque principale Documentaires Disponible Smart coating with microencapsulation technology / Meghana Rajaram Rode in PAINTINDIA, Vol. LXIX, N° 2 (02/2019)
[article]
Titre : Smart coating with microencapsulation technology Type de document : texte imprimé Auteurs : Meghana Rajaram Rode, Auteur Année de publication : 2019 Article en page(s) : p. 53-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels.
On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués.
Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3.
Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire.
D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel.
Anticorrosifs
Anticorrosion
Encapsulation
Epoxydes
Formulation (Génie chimique)
Matériaux intelligents
Microémulsions
Polyisocyanates
Polymères à terminaison amine
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : While there are various types of smart coating available, this paper is based on smart coating with pH-triggered release microcapsules which is one of the advanced techniques in coating system. These microcapsules can be incorporated into various coating systems for corrosion detection, protection and self-repair of mechanical coating damage. This paper will present the results from progress made to date in the controlled release properties of these microcapsules as well as in their corrosion indication and corrosion inhibition function. This paper covers the recent progress made in the encapsulation process, the characterization of these microcapsules as well as results showing the controlled release function & different techniques used for microencapsulation & its applications. Note de contenu : - INTRODUCTION : Structure of microcapsules - Core - Shell - Morphology of microcapsules
- PAINT FORMULATION WITH MICROENCAPSULATION : Compatibility study between paint formulation and the microcapsules - Solvents compatibility test - Formulation stability test - Microcapsules effect on coating adhesion - Paint formula and coating process effect on microcapsules - Microencapsulation process
- Oil - in - water microemulsion process - Water - in - oil microemulsion process
- ENHANCING COATING FUNCTIONALITIES WITH MICROCAPSULES
- COMMONLY USED COAT MATERIALS IN MICROENCAPSULATION : Coating material properties
- APPLICATIONS OF MICROENCAPSULATION TECHNOLOGY IN COATING SYSTEM : Corrosion control in coating - Self-healing coating based on microcapsules - Novel responsive surfaces based on active hybrid coatings utilizing encapsulation technologies - Encapsulated antifreeze agent for anti-ice coatings - Self-healing concrete with a microencapsulated healing agent
- CONTROLLED RELEASE OF THE MICROCAPSULES : pH controlled release properties of the microcapsules - Controlled release of microcapsule content at the onset of corrosion
- Fig. 1a : Schematic of microcapsule
- Fig. 1b : Shell categories
- Fig. 2 : Morphology of microcapsule
- Fig. 3 : PATTI adhesion test results of various commercial paint systems
- Fig. 4a : Microcapsules appear dispersed and stable inside the epoxy amine coating
- Fig. 4b : Color change observed when microcapsules in dry paint were exposed to basic pH conditions
- Fig. 5a : Steps involved in the interfacial polymerization of oil-in- water microemulsion process for making oil core microcapsules (oil is shown in yellow and water in blue)
- Fig. 5b : Steps involved in the interfacial polymerization of water-in-oil microemulsion process for water core microcapsules. Oil is shown in yellow and water in blue
- Fig. 6 : Schematic diagram showing pathways for microcapsule incorporation into coating
- Fig. 7 : The central component of the smart coating system : pH sensitive microcapsules which break down under basic pH conditions
- Fig. 8 : Smart coating with pH sensitive microcapsules for corrosion detection and protection application
- Fig. 9 : End-blocking of isocyanate groups for hindered reactivity of IPDI
- Fig. 10 : Time lapse pictures of microcapsules breaking down under basic pH
- Fig. 11 : A galvanic corrosion test cell consisting of a carbon steel disc in contact with copper tape was set up and immersed in gel with microcapsules containing a corrosion indicator. As the carbon steel corodes, the encapsulated corrosion indicator is released and its color change to purple shows the initiation and progress of corrosion
- Table 1 : Compatibility of microcapsules with commercial resins formulations
- Table 2 : Commonly used coat materials in microencapsulation
- Table 3 : Concentration of cerium released from microcapsules in pH 7 and 14 solutions over timeEn ligne : https://drive.google.com/file/d/1ytdqxFE9xYJh9bfOXGQ04xoC4lCuNUxI/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31953
in PAINTINDIA > Vol. LXIX, N° 2 (02/2019) . - p. 53-67[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20676 - Périodique Bibliothèque principale Documentaires Disponible Solvent free aliphatic polyisocyanates / Uwe Wustmann in EUROPEAN COATINGS JOURNAL (ECJ), N° 11/97 (11/1997)
[article]
Titre : Solvent free aliphatic polyisocyanates Type de document : texte imprimé Auteurs : Uwe Wustmann, Auteur ; Pierre Ardaud, Auteur ; Eugénie Perroud, Auteur ; Thierry Jeannette, Auteur Année de publication : 1997 Article en page(s) : p. 1022-1024 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polyisocyanates
Polyuréthanes
Réticulation (polymérisation)
Revêtements poudre:Peinture poudreIndex. décimale : 667.9 Revêtements et enduits Résumé : Solvent based non-yellowing 2K polyurethanes nowadays offer the best combination of properties for the production of high quality coatings. Due to their flexibility, gloss retention and weather resistance, polyurethane coatings are used all over the world in a variety of applications. A number of different hydroxylated resins are available to produce coatings with property profiles ideally suited for specific requirements. Environmental considerations and national legislations impose a continuous reduction of solvent emissions. So both resin producers and paint manufacturers are confronted with those new regulations and the necessity to adjust their production to new stipulations. In this study, it will be demonstrated how the solvent content of a PU formulation can be influenced by the correct choice of a polyisocyanate hardener. Note de contenu : - Chemical reaction mechanisms
- Solutions - High solids
- Water as a solvent
- Powder coatingsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11438
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 11/97 (11/1997) . - p. 1022-1024[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002533 - Périodique Bibliothèque principale Documentaires Disponible Solvent-free rigid 2K polyurethanes for protective coatings / Matthias Wintermantel in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4592 (01/2014)
PermalinkStudy of cross-linking reactions on butadiene binders in aqueous finishing / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 6 (11-12/2010)
PermalinkSyntheses and characterizations of two-component polyurethane flame retardant coatings using 2,4-dichloro modified polyesters / Chang-Hwan Park in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 875 (12/1997)
PermalinkSynthesis and properties of water-dispersible polyisocyanates carrying sulfonate / Zhongkang Peng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)
PermalinkToward solventless liquid coatings / Frank N. Jones in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 852 (01/1996)
PermalinkTwo component polyurethane coatings based on epoxy polyol with polyisocyanate / J. Tennis Anthuvan in PAINTINDIA, Vol. LXI, N° 2 (02/2011)
PermalinkTwo component waterborne polyurethanes for construction coatings / Prashant Gangwar in PAINTINDIA, Vol. LXIII, N° 4 (04/2013)
PermalinkTwo-component waterborne polyurethanes : The rheology of mixing / H. Bui in EUROPEAN COATINGS JOURNAL (ECJ), N° 5/97 (05/1997)
PermalinkPermalinkUnique diol resin for improved performance of 2-component polyurethane floor coatings / John Florio in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4626 (11/2016)
PermalinkVanillin as low-temperature isocyanate-blocking agent and its use in one-component aqueous coatings / Philipp Knospe in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
PermalinkWhat type of raw materials should be considered in formulating products with a bio-based focus ? / Jeffrey F. Dormish in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 24, N° 3 (03/2017)
PermalinkWhat types of chemical structures could be built into a polyurethane adhesive to optimize heat resistance ? / Jeffrey F. Dormish in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 23, N° 5 (05/2015)
PermalinkWoodcoatings : protecting and enhancing natural beauty / Sunil Menon in PAINTINDIA, Vol. LXI, N° 6 (06/2011)
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