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The race for improved weathering / Matt Andersson in EUROPEAN COATINGS JOURNAL (ECJ), N° 1 (01/2021)
[article]
Titre : The race for improved weathering : A UV analysis technique that speeds up product development Type de document : texte imprimé Auteurs : Matt Andersson, Auteur ; Karl Booth, Auteur Année de publication : 2021 Article en page(s) : p. 40-43 Langues : Anglais (eng) Catégories : Brillance (optique)
Caractérisation
Fourier, Spectroscopie infrarouge à transformée de
Indice carbonyle
Photo-oxydation
Photodétérioration
Rayonnement ultraviolet A
Réflexion totale atténuée
Résistance aux conditions climatiques
Revêtements -- Détérioration
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : New product development and major reformulation of high-durability exterior coatings are among the highest risk projects a coatings lab can undertake. This is due to the years-long exterior exposure time required to validate a new product's performance, in addition to the standard formulation and test cycle time of several months. Many attributes are associated with the assessment of a coating's weatherability, such as grain-crack resistance, adhesion and chalk. In the architecture semi-gloss to high-gloss space, an emphasis has rightly been placed on gloss retention as a distinguishing attribute between high performance and economy product classes. Note de contenu : - Gloss retention today
- Gloss retention and photodegradaton
- Our improved method : ATR-FTIR characterisation
- How we did it
- Correlating carbonyl index and cyclic UVA
- Accelerating development
- Fig. 1 : ATR-FTIR characterisation
- Fig. 2 : Assignment of onset of failure by photooxidation
- Fig. 3 : Carbonyl index at one week exposure vs onset of gloss failure
- Fig. 4a : δcarbonyl index measured after 24hrs cyclic UVA exposure
- Fig. 4b : Onset of failure of gloss retentionby cyclic UVA
- Fig. 5a : Carbonyl index after seven days exposure
- Fig. 4b : Onset of failure of gloss retention by cyclic UVA
- Fig. 5b : 168 h measurement of carbonyl index predicts relative performance of commercial HG polymers
- Table 1 : Infrared absorption wavelengths for relevant functionalitiesEn ligne : https://drive.google.com/file/d/1cti9HW3V9hdCZ-CucD5b287QTa2OkXg9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35840
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 1 (01/2021) . - p. 40-43[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22760 - Périodique Bibliothèque principale Documentaires Disponible The role of crosslinking agents in the process of fast thermal curing of polyester resin / Nadeshda Denisova in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4605 (02/2015)
[article]
Titre : The role of crosslinking agents in the process of fast thermal curing of polyester resin Type de document : texte imprimé Auteurs : Nadeshda Denisova, Auteur ; Irina Kudinkina, Auteur ; Natalia Vlasova, Auteur ; Alexander Llyin, Auteur Année de publication : 2015 Article en page(s) : p. 18-22 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Formulation (Génie chimique)
Fourier, Spectroscopie infrarouge à transformée de
Hexaméthoxy méthyl mélamine
Polyesters
Réflexion totale atténuée
Réticulants
Revêtements:Peinture
Sol-gel, Procédé
Tétraméthoxy méthyl mélamineIndex. décimale : 667.9 Revêtements et enduits Résumé : The influence of the crosslinking agent type and amount on the process of fast thermal curing and on the properties of polyester coatings were investigated. Hexa(methoxy-methyl)melamine (HMMM) and tetra (methoxymethyl)melamine (TMMM) were used as crosslinking agents for the polyester resin.
The process of the polyester/melamine system crosslinking was studied by sol-gel analysis and ATR-FTIR Spectroscopy. The castings with TMMM differed from the coatings with HMMM, the latter having improved hardness, MEK resistance and higher glass transition temperature. However, they were inferior in terms of elasticity and adhesion. The necessary balance of ail the above-men-tioned physical and mechanical properties was obtained for the films with the methoxy/ hydroxy-group ratio of 3,4 for HMMM and 2.3 for TMMM.
Keywords: crosslinking agent, hexa (methoxymethyl)melamine, tetra(methoxy methyl)melemine, sol-gel analysis, ATR-FTIR Spectroscopy.En ligne : https://drive.google.com/file/d/19m74SX2kJob5VTkQ4BPWeei2hcG49dry/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23244
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 205, N° 4605 (02/2015) . - p. 18-22[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16967 - Périodique Bibliothèque principale Documentaires Disponible