Automated dynamic testing for drying, hardness, and adhesion of paints, coatings, and adhesives / Ronald T. Obie in COATINGS TECH, Vol. 19, N° 2 (02/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 2 (02/2022) . - p. 40-59 Titre : Automated dynamic testing for drying, hardness, and adhesion of paints, coatings, and adhesives Type de document : texte imprimé Auteurs : Ronald T. Obie, Auteur ; Cameron R. Anderson, Auteur Année de publication : 2022 Article en page(s) : p. 40-59 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs -- Séchage Adhésion Essai de dureté Essais dynamiques Revêtement -- Séchage Revêtement -- Séchage:Peinture -- Séchage Revêtement en phase solvant Revêtements en phase aqueuse Temps de séchage Index. décimale : 667.9 Revêtements et enduits Résumé : Characterization of dry and cure is very important in the development of paints, coatings, and adhesives. It can be challenging to assess dry and cure of these products on a quantitative, non-biased basis. Although there are many different techniques utilized to assess drying, curing, and performance, some are often qualitative at best. It would be useful to have quantitative techniques available to access these properties. In this paper, we introduce a novel automated dynamic dry time recorder (ADDTR) device that measures dry and cure of coatings similar to mechanical dry time recorders that meet ASTM Method D 5895. The novel device is capable of recording and graphically displaying the coating drying profile as it dries so that drying time events may be easily identified, archived, and analyzed, even for clear coatings. Such analysis allows easy and quantitative comparison between different coating systems, chemistries, driers, etc. In certain configurations, the tester may also be utilized as a hardness, toughness, and adhesion tester. Note de contenu : - Drying time determination - Solvent-based coatings - Drying time determinationa - Water-based coatings - Hardness testing of films En ligne : https://drive.google.com/file/d/1jS37p5GhUTprXBX57mpbyIctul1kid2w/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37244 [article]

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Stresses in the adhesive joint after curing / Jana Kolbe in ADHESION - ADHESIVES + SEALANTS, Vol. 20, N° 2/2023 (2023)  

[article]  inADHESION - ADHESIVES + SEALANTS > Vol. 20, N° 2/2023 (2023) . - p. 30-34 Titre : Stresses in the adhesive joint after curing Type de document : texte imprimé Auteurs : Jana Kolbe, Auteur ; Christoph Nagel, Auteur Année de publication : 2023 Article en page(s) : p. 30-34 Langues : Multilingue (mul) Catégories : Adhésifs -- Séchage Bisphénol A Dilatométrie Flexion (mécanique) Mesure Réactions chimiques Réticulants Index. décimale : 668.3 Adhésifs et produits semblables Résumé : During setting of adhesives, there is a volume decrease which can lead to undesirable stresses in the bonded joint. For many applications, these stresses are simulated in the design period in order to optimise the bonded joint. But how high is the volume reduction that has to be taken into account ? Note de contenu : - Volume reduction of the adhesive - Experimental determination of the volume change via the density difference - Determination of volume change by means of a mercury dilatometer - Determination of volume change with the bending beam method - Conversion during adhesive curing - Fig. 1 : Reaction between epoxidized bisphenol A and an amine hardener - Fig. 2 : Schematic structure of a mercury dilatometer - Fig. 3 : Principle of a shrinkage bending beam measurement - Table 1 : Bond length for different atomic bonds ; pm = 10-12 m - Table 2 : Volume change using the shrinkage bending beam method - elasticity constants E = 70000 MPa (substrate) and 2280 MPa (layer) En ligne : https://drive.google.com/file/d/1W29lCNdoK0cL9wtzkwCRyQoF1mBA04_g/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39393 [article]

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