Boosting technical performance / Giulio de Egidio in EUROPEAN COATINGS JOURNAL (ECJ), N° 2 (02/2020)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 2 (02/2020) . - p. 32-36 Titre : Boosting technical performance : Less hazardous cross-linkers and dormant curing capabilities yet better results Type de document : texte imprimé Auteurs : Giulio de Egidio, Auteur ; Matthias Hüttl, Auteur ; Robert Lomax, Auteur Année de publication : 2020 Article en page(s) : p. 32-36 Langues : Anglais (eng) Catégories : Agents de blocages Polyisocyanates Réticulants Réticulation (polymérisation) Solubilisants (chimie) Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Industry has been moving away from traditional solvent-borne coatings often to water-based systems. Manufacturers also try to provide formulators with cross-linkers and adhesion pro-moters that meet changing and challenging market needs. Isocyanate chemistry is a very useful tool for achieving this goal. The focus is on further reducing or eliminating VOCs, providing flexibility over a full pH range and wherever possible delivering solutions that have minimal impact on health, safety and the environment. Note de contenu : - Where we stand - Aqueous finishing systems - Molecular structure matters - Full cure and final properties - Hard coatings - Other applications - Fig. 1 : Reaction of an isocyanate with an active hydrogen compound (AHC) - Fig. 2 : Conversions of polyisocyanates with blocking agents (H-B) and solubilising groups (H-Sol) - Fig. 3 : Some main blocking agents used in industrial blocked isocyanates with their unblocking temperature requirements - Fig. 4 : Schematic diagram of blocked isocyanate curing mechanism - Table 1 : Some commercial Trixene Aqua grades and development products En ligne : https://drive.google.com/file/d/12k4-gpDa7zUNDFTLe-yXwZ9o_zIi-GzI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33521 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21541	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Solutions for polyurethane can coatings / Guido Streukens in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8 (07-08/2021)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8 (07-08/2021) . - p. 24-28 Titre : Solutions for polyurethane can coatings : PU coating solutions for direct food contact and cosmetic packaging applications Type de document : texte imprimé Auteurs : Guido Streukens, Auteur ; Marcel Inhestern, Auteur ; Dennis Menne, Auteur ; Dörte Wessels, Auteur Année de publication : 2021 Article en page(s) : p. 24-28 Langues : Anglais (eng) Catégories : Agents de blocages Aliments -- Emballages Cosmétiques -- Emballages Formulation (Génie chimique) Polyuréthanes Réticulants Revêtement monocomposant Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Can coatings ensure zero interaction between a metal container and its contents and market the product with an appealling external appearance. Add regulatory requirements and to reduce solventborne systems and efficient processing demands into the mix and the options become limited. A new range of innovative hardeners for PUR powder and liquid coatings present a viable solution and the resulting coatings offer performance to compete epoxy-based systems. Note de contenu : - Efficient processing requires fast curing speeds - Improved processability with novel hardener - Liquid 1K PUR can coatings - Stable and regulation-compliant solution - Fig. 1 : Layers of different can coatings - Fig. 2 : Blocking agent related curing settings - Fig. 3 : Reaction mechanism of curing with DEM-blocked crosslinkers - Fig. 4 : Functionality of blocked PUR crosslinkers for powder coatings - Fig. 5 : Liquid hardeners versus PUR powder hardener - Table 1 : The basic needs for can coatings can be summarised into four general categories - Table 2 : Coating formulation for interior food packaging En ligne : https://drive.google.com/file/d/1KciiqNrK5a0JHA34niUOTHZZ6uhZ52YP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36047 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
22830	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Vanillin 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)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 501-520 Titre : Vanillin as low-temperature isocyanate-blocking agent and its use in one-component aqueous coatings Type de document : texte imprimé Auteurs : Philipp Knospe, Auteur ; René Reichmann, Auteur ; Jochen S. Gutmann, Auteur ; Michael Dornbusch, Auteur Année de publication : 2023 Article en page(s) : p. 501-520 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de blocages Analyse thermomécanique dynamique Déblocage Dispersions et suspensions Durée de vie (Ingénierie) Formulation (Génie chimique) Liants en phase aqueuse Polyisocyanates Revêtements en phase aqueuse Trimères En chimie, un trimère est un objet moléculaire ou une structure composée de l'association de 3 éléments de base semblables entre eux. C'est un composé chimique issu de la réaction entre trois molécules identiques (appelées monomères). La réaction chimique qui produit des trimères est appelée trimérisation. Vanilline Index. décimale : 667.9 Revêtements et enduits Résumé : Mainly because of the high sensitivity of the isocyanate group to atmospheric moisture, it is blocked with a blocking agent for many applications and thus kept as inert as possible at room temperature (Zhang et al. in Langmuir ACS J Surf Colloids 37:12705, 2021, Meier-Westhues in Polyurethane: Lacke, Kleb-und Dichtstoffe, Vincentz Network, Hannover, p 36, 2007). When exposed to temperature, the protective group unblocks, and the isocyanate group reacts with the reactant that was previously present together with the blocked isocyanate (Meier-Westhues in Polyurethane: Lacke, Kleb- und Dichtstoffe, Vincentz Network, Hannover, p 36, 2007, Goldschmidt and Streitberger in BASF handbook on basics of coating technology, Vincentz Network, Hannover, pp 96–99, 2007). Many of the substances which are used today as blocking agents have toxicological concerns or unblock at high temperatures, which limits their application areas (Guillem Parra et al. in Blocked isocyanate polyurethane compositions using a new blocking agent, method of manufacture and uses thereof: European patent application, 2019, https://data.epo.org/publication-server/document?iDocId=6506253&iFormat=0). In this work, vanillin is presented as an effective deblocking agent at low temperatures and is compared with similar structures. The process of deblocking from an hexamethylene diisocyanate trimer (HDI-trimer) is followed by means of IR-spectroscopic measurements at different temperatures and thermogravimetric analysis. Temperature-dependent oscillation measurements using a rheometer are suitable for measuring onset temperatures and for qualitatively tracking the unblocking process. The combination of the results is used to draw conclusions about the existing deblocking mechanism. The comparatively low deblocking temperature of vanillin enables the formulation of an HDI-trimer modified with sulfonate groups and blocked with vanillin, which is dispersed in the aqueous phase and then reacted with OH-functional binders. Deblocking and subsequent reaction with the binder are followed by means of IR spectroscopy, and the mechanical properties of the coating films are examined. Vanillin is therefore suitable as a toxicologically harmless blocking agent for isocyanates and enables the production of crosslinkers for one-component water-based coatings (Arya et al. Adv Tradit Med (ADTM) 21:1, 2021). Note de contenu : - Raw materials - Analytical methods - Synthesis of the compounds : 4-(Hydroxymethyl)benzaldehyde - Vanillin-Na-4-HBS-trimer - Application testing - Table 1 : Mean values of deblocking temperatures from selected blocking agents - Table 2 : Formulations for the reaction between vanillin-Na-4-HBS-trimer and different water-based binders - Table 3 : Coating properties of reaction of vanillin-Na-4-HBS-trimer with different water-based binders DOI : https://doi.org/10.1007/s11998-022-00696-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00696-w.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39294 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24056	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)