Influence of drier combination on through-drying in waterborne alkyd emulsion coatings observed with magnetic resonance profiling / J. Mallégol in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 933 (10/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 933 (10/2002) . - p. 113-124 Titre : Influence of drier combination on through-drying in waterborne alkyd emulsion coatings observed with magnetic resonance profiling Type de document : texte imprimé Auteurs : J. Mallégol, Auteur ; P. K. Weissenborn, Auteur ; A. Motiejauskaite, Auteur ; M. Wallin, Auteur ; Joseph L. Keddie, Auteur ; P. J. McDonald, Auteur ; P. M. Glover, Auteur ; E. Ciampi, Auteur ; A. M. Barry, Auteur Année de publication : 2002 Article en page(s) : p. 113-124 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Mécanisme  réaction  Dureté  Feuil  Propriété  mécanique  Résonance  magnétique  Adjuvant  Siccatif  Séchage  Formation  feuille  Alkyde  résine  Peinture  émulsion  eau  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Achieving fast and uniform crosslinking in alkyd coatings poses a challenge to formulators that demands a fundamental understanding of drier efficiency. In recognition of this, we have examined the physical changes that accompany autooxidative crosslinking in alkyd films (cast from waterborne emulsions) in the presence of various combinations of metal carboxylate driers. A newly developed type of magnetic resonance (MR) profiling was used in conjunction with conventional techniques : Beck-Koller drying tests, pendulum hardness, and mass uptake. MR profiling noninvasively probes the molecular mobility of the alkyd as a function of depth (with a pixel resolution of about 9 µm), over drying times ranging from minutes to weeks. It thereby indicates drier efficiency via its sensitivity to viscosity build-up during drying and to subsequent film hardening. We show unequivocally that more uniform crosslinking is achieved using a combination of a primary (Co) and a secondary (Ca) drier, in support of conventional belief. Furthermore, these results yield new insight into the chemical mechanisms induced by the driers and are thus of clear benefit to coatings researchers and formulators. Notably, the secondary driers improve the efficiency of the hydroperoxide decomposition reactions, but they are only active during an initial period, after which crosslinking nonuniformity develops. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5618 [article]

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Understanding water-borne coatings : New techniques to answer old questions / Joseph L. Keddie in SURFACE COATINGS INTERNATIONAL. PART A : COATINGS JOURNAL, Vol 87, A02 (03/2004)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART A : COATINGS JOURNAL > Vol 87, A02 (03/2004) . - p. 70-73 Titre : Understanding water-borne coatings : New techniques to answer old questions Type de document : texte imprimé Auteurs : Joseph L. Keddie, Auteur ; J.-P. Gorce, Auteur ; J. Mallégol, Auteur ; P. J. McDonald, Auteur Année de publication : 2004 Article en page(s) : p. 70-73 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couches minces Imagerie par résonance magnétique Latex Réticulation (polymérisation) Revêtements en phase aqueuse -- Séchage:Peinture en phase aqueuse -- Séchage Index. décimale : 667.9 Revêtements et enduits Résumé : Ever since latexes were first developed in the 1940s, questions have been asked about the process by which polymer particles are transformed into a continuous film or coating. The process of latex film formation, as it is called, has always been mysterious. With the refinement of new non-invasive analytical techniques to probe the process, it is now becoming much better understood. We will consider a few of the 'old questions' that have now been with the help of these 'new techniques'. Note de contenu : - THIS IS AN EXTENDED REPORTON THE LECTURE PRESENTED TO THE LONDON SECTION - QUESTION ABOUT DRYING ANSWERED WITH MAGNETIC RESONANCE PROFILING : Observations of lateral drying - MR imaging of drying on the vertical direction - QUESTIONS ABOUT PARTICLE COALESCENCE ANSWERED WITH ATOMIC FORCE MICROSCOPY En ligne : https://drive.google.com/file/d/1aehfIEWNS0WrEg94jMVuZYsiHUVkD0Xq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16304 [article]

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