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Comparing the properties of isocyanate and non-isocyanate curing coatings / Dmitrii Smirnov in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4652 (06/2019)
[article]
Titre : Comparing the properties of isocyanate and non-isocyanate curing coatings Type de document : texte imprimé Auteurs : Dmitrii Smirnov, Auteur ; Irina Grianko, Auteur ; Larisa Sakharova, Auteur ; Dmitrii Vasilev, Auteur ; Aleksandr Llin, Auteur Année de publication : 2019 Article en page(s) : p. 23-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion
Durée de vie en pot
Formulation (Génie chimique)
Perméabilité
Polyuréthanes
Réactions chimiques
Résistance à l'abrasion
Résistance au rayonnement ultraviolet
Résistance chimique
Réticulation (polymérisation)
Revêtement en phase solvant
Revêtements -- Teneur en composés organiques volatils
Revêtements bi-composant
Revêtements organiques
Revêtements sans isocyanates
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : The number of studies on reduction of volatile organic compounds (VOC) content', as well as minimisation or complete elimination of isocyanates in the solventborne 2K PUR coatings has significantly increased over the lest few decades.
The growing demand for coating systems with a limited volatile organic compounds (VOC) content and desire to eliminate toxic isocyanates as curing agents in 2K polyurethane coatings are driving the development and research of alternative («non-isocyanate» NISO-) curing technologies. It is important that physical, mechanical, protective and decorative properties of the new coatings are comparable to those of conventional solventborne 2K polyurethane systems. The non-isocyanate curing coatings must, as far as possible, compensate the drawbacks and limitations of conventional solventborne 2K systems.
The objective was to carry out a comparison study of the properties and performance of conventional solventborne 2K PUR medium and high solid coatings and systems based on different non-isocyanate curing technologies presently available in the coating raw materials market.Note de contenu : - MATERIALS : Isocyanate-based systems (Formluations 1 and 2) - Non-isocyante curing systems (Formulations 3-6)
- METHODS
- RESULTS AND DISCUSSION : Physical properties of the liquid coatings - Rheological measurements within the pot life - Curing process, film hardness, Taber abrasion resistance, chemical resistance and permeability - Film adhesion - QUV-B resistance
- Fig. 1 : Curing by Michael addition
- Fig. 2 : Polyurethane formation as a result of polycarbamate and polyaldehyde reaction
- Fig. 3 : Reaction between carboxyl and epoxy group
- Fig. 4 : Typical film drying stages
- Fig. 5 : VOC content in the coatings
- Fig. 6 : Complex viscosity vs pot life at 20°C
- Fig. 7 : Time distribution of various film curing process stages at 23 ± 2°C
- Fig. 8 : Film curing to mechanical resistance at 60°C
- Fig. 9 : Film hardness after 1 and 7 days of curing at 20°C
- Fig. 10 : Film Tg values after 7 days of curing at 20°C (1st and 2nd run)
- Fig. 11 : Mass loss values after 500 abrasion cycles
- Fig. 12 : Electrochemical impedance vs current frequency
- Fig. 13 : Colour difference (ΔE) after 500hr exposure to QUV-B(313nm)
- Table 1 : Physical properties of the studied systems
- Table 2 : Hydroxy-functional acrylic copolymer properties
- Table 3 : Film adhesionEn ligne : https://drive.google.com/file/d/1g5IgjWIKcCWjL5ve8i-IQP0k6zgzmbSj/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32706
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4652 (06/2019) . - p. 23-27[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21011 - Périodique Bibliothèque principale Documentaires Disponible Factors influencing the interlayer adhesion in the CED primer/waterborne coating system / Natalia Vlasova in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4654 (09/2019)
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Titre : Factors influencing the interlayer adhesion in the CED primer/waterborne coating system Type de document : texte imprimé Auteurs : Natalia Vlasova, Auteur ; Valentina Miloslavskaya, Auteur ; Larisa Sakharova, Auteur ; Viktor Ozhiganov, Auteur ; Evgenii Indeikin, Auteur Année de publication : 2019 Article en page(s) : p. 29-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion
Anticorrosifs
Anticorrosion
Copolymère mélamine-Formaldéhyde
Copolymère uréthane époxy
MélamineLa 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
Primaire (revêtement)
Réticulants
Revêtements en phase aqueuse -- Additifs
Revêtements protecteurs
Tension superficielleIndex. décimale : 667.9 Revêtements et enduits Résumé : The authors discusses a study of an epoxy urethane cathodic electrodeposition primer and polyester melamine paint, containing melamine-formaldehyde cross-linking agents with different alkylation degrees and types, as well as an acid catalyst for acceleration of the curing process.
Among the broad variety of anticorrosion coatings, cathodic electrodeposition (CED) primers have an undeniable superiority. Such primers are overcoated with weather resistant coatings to obtain weatherability and the necessary decorative properties. From the point of view of environmental safety and fire protection, waterborne stoving paints are of the highest interest, however, there is a risk of interlayer adhesion failure due to the primer layer over-drying. In the present work, epoxy urethane cathodic electrodeposition primer and polyester melamine paint, containing melamine-formaldehyde cross-linking agents with different alkylation degrees and types as well as an acid catalyst for acceleration of the curing process have been studied. The physical and chemical factors influencing the interlayer adhesion in the system consisting of epoxy urethane CED primer and polyester melamine waterborne stoving paint have been investigated and conditions under which a complete interlayer adhesion failure occurs have been determined.Note de contenu : - Materials and methods
- Waterborne coating crosslinking rate and degree
- CED primer/waterborne coating interlayer adhesion
- Interfacial energy properties
- Fig. 1 : Storage modulus vs time for the curing of the coatings with PMMM - 1 ; HMMM without a catalyst - 2 ; HMMM with 0.3%p-TSA - 3 and the temperature curve - 4
- Fig. 2 : Intertayer adhesion of the waterborne coating with PMMM (1) HMMM without the catalyst (2), HMMM with 0.3%p-TSA(3)to CED primer cured at 165°C for 15min. (a), at 165°C for 30min (b), at 180°C for 15min (c), at 180°C for 30min (d)
- Table 1 : Polyester coating MEK resistance
- Table 2 : MEK-resistance of CED primers
- Table 3 : Interlayer adhesion for different CED primer/waterborne coating systems
- Table 4 : Specific surface energy and its components for the CED primer surfaces
- Table 5 : Surface tension for liquid waterborne coatings
- Table 6 : Interfacial tension between the CED primer and the waterborne coatingEn ligne : https://drive.google.com/file/d/1EcybHljC3XOLsbF72p-bKBBpL1FHz8gY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32918
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 29-30[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21175 - Périodique Bibliothèque principale Documentaires Disponible