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Auteur Keith R. Olesen |
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Predicting the water-sensitivity of film-forming coatings additives by water vapor sorption : with application to thickeners and rheology modifiers / Greg D. Shay in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 854 (03/1996)
[article]
Titre : Predicting the water-sensitivity of film-forming coatings additives by water vapor sorption : with application to thickeners and rheology modifiers Type de document : texte imprimé Auteurs : Greg D. Shay, Auteur ; Keith R. Olesen, Auteur ; Jeanne L. Stallings, Auteur Année de publication : 1996 Article en page(s) : p. 51-63 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces
Epaississants
Humidité -- Absorption
Mesure
Revêtements
Revêtements -- Additifs
Vapeur d'eauIndex. décimale : 667.9 Revêtements et enduits Résumé : Although present in relatively low concentrations, additives such as thickeners, rheology modifiers, dispersants, and surfactants can contribute to the water sensitivity of coatings due to their inherent affinity for moisture. Because of the number of additives often present and the variable response possible within different formulations, a method was sought to examine the moisture affinity of individual additives in the absence of other coating components. A simple gravimetric procedure with high sensitivity and good repeatability was developed based on water vapor sorption (WVS). In this paper, the technique is applied to a variety of commercial thickeners and rheology modifiers commonly employed in waterborne coatings. Although alkali-swellable emulsions of the conventional (ASE) and associative (HASE) varieties are generally considered to be more water sensitive than nonionic thickener types, these carboxyl functional polymers in their acid form actually showed much lower moisture affinities. WVS for the anionic ASE and HASE thickeners was a function of polymer composition, type of counter ion, base volatility, dry time, and the state of neutralization prior to conducting the test. Note de contenu : - CONCEPTS/THEORY : Causes of water-sensivity - Moisture affinity methods - Water vapor sorption theory
- EXPERIMENTAL DETAILS : Test method - Materials
- RESULTS AND DISCUSSION : General observations - Test repeatablity - Effect of film weight - Effect of temperature - Comparative WVS thickener evaluations - Effect of neutralizing agents with ASE/HASE - Degree of neutralization with ASE/HASE - Estimation of diffusion and partition coefficients - Molecular weight - Other film propertiesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18467
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 854 (03/1996) . - p. 51-63[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 003524 - Périodique Bibliothèque principale Documentaires Exclu du prêt Quantitative method for determination of thickener equilibration in coatings / Greg D. Shay in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 890 (03/1999)
[article]
Titre : Quantitative method for determination of thickener equilibration in coatings Type de document : texte imprimé Auteurs : Greg D. Shay, Auteur ; Keith R. Olesen, Auteur ; David L. Hardman, Auteur Année de publication : 1999 Article en page(s) : p. 51-59 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epaississants
Formulation (Génie chimique)
Mélanges (chimie)
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs
Rhéologie
ViscosimétrieIndex. décimale : 667.9 Revêtements et enduits Résumé : A quantitative method for the determination of thickener incorporation rates and thickener equilibration times (TET) in coatings has been developed using a digital Krebs viscometer. Upon adding thickener to a coating sample, the viscometer simultaneously provides viscosity readout and continuous mixing at constant speed with degree of agitation simulating the relatively poor mixing conditions observed in some paint production equipment near the end of the process cycle. By plotting viscosity as a function of mixing time on the instrument, rates of incorporation and equilibration were obtained. The method proved to be reliable and generally reproducible in limited testing with apparent applicability to a variety of thickener types in both aqueous solution and in actual latex coating formulations. Meaningful comparisons of incorporation are now possible to facilitate appropriate thickener selection and to provide insight regarding optimal modes of incorporation or orders of addition for process cycle time reduction. Note de contenu : - INTRODUCTION : Thickener types and incorporation options - Thickener equilibration
- EXPERIMENTAL : Detailed procedure for aqueous solutions - Detailed processus for pigmented coatings
- RESULTS AND DISCUSSION : Effect of thickener concentration in paint - Effect of temperature - Procedure repeatability in aqueous solution - Effect of thickener addition rate - Effect of thickener type in aqueous solution - Instrument and viscosity stability in aqueous solution - Effect of thickener type in pigmented coatings - Effect of thickener dilution in paint - Effect of base addition order in a HASE thickenerPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18029
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 890 (03/1999) . - p. 51-59[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 009604 - Périodique Bibliothèque principale Documentaires Exclu du prêt