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Advances in emulsion polymerization for coatings applications / Mohamed S. El-Aasser in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 920 (09/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 920 (09/2001) . - p. 51-63 Titre : Advances in emulsion polymerization for coatings applications : Latex blends and reactive surfactants Type de document : texte imprimé Auteurs : Mohamed S. El-Aasser, Auteur ; E.-D. Sudol, Auteur ; Victoria L. Dimonie, Auteur ; Eric S. Daniels, Auteur ; Xiaoru Wang, Auteur ; Jiansheng Tang, Auteur Année de publication : 2001 Article en page(s) : p. 51-63 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  eau  émulsion  Liant  Préparation  Polymérisation  Latex  Mélange  Adjuvant  Agent  surface  Distribution  dimension  particule  Propriété  optique  Feuil  Brillant  Styrène  polymère  Groupe  carboxyle  Etude  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : The utilization of latex blends to prepare zero-VOC coatings and the use of reactive surfactants in emulsion polymerization are two advances in waterborne technology that are of increasing interest to coatings formulators. The first part of this paper focuses on an investigation of the influence of the interface between high and two Tg latex particles on the glass and surface morphologies of films obtained from model latex blends. Glass was influenced by the concentration of carboxyl groups present on the surface of the latex particles (optimal concentration for maximum gloss 3% on the high Tg particles), the degree of neutralization of these groups (higher glass with increased extent of neutralization), the type and concentration of the neutralizing base (higher gloss for stronger bases), and the presence of added surfactant (higher gloss with added surfactant). Gloss was found to be correlated with the surface smoothness of the film. The kinetics, particle size, molecular weight, and location of the reactive surfactant after polymerization, as well as the contact angle of films prepared from these latices, are examined in the second part of this paper. The polymerization rate profiles were similar to those obtained using a conventional surfactant ; however, the dependency of the rate on the number of particles was significantly lower. The amount bound increased and the molecular weight decreased with increasing surfactant concentration. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5746 [article]

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Duration of wood preweathering / R. Sam Williams in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 920 (09/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 920 (09/2001) . - p. 65-72 Titre : Duration of wood preweathering : effect on the service life of subsequently applied paint Type de document : texte imprimé Auteurs : R. Sam Williams, Auteur ; William C. Feist, Auteur Année de publication : 2001 Article en page(s) : p. 65-72 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  Adhérence  Thermoplastique  Oléfine  polymère  Industrie  automobile  Matière  plastique  Méthode  mesure  Adjuvant Index. décimale : 667.9 Revêtements et enduits Résumé : The use of thermoplastic poly(olefins) in the automotive industry continues to proliferate due to their decreased cost and weight and increased recyclability in comparison to thermoplastics such as poly(carbonate) alloys or poly(urethanes). An attribute that continues to hamper the widespread introduction of thermoplastic poly(olefins), in particular thermoplastic olefin (TPO, a blend of impact copolymer and elastomer), into additional automotive components, however, is its poor surface wettability and adhesion. Adhesion promoter formulation, both in terms of resin composition and solvent variation, has been known to influence the adhesive propensity of topcoats when analyzed by typical tests such as peel strength. It has long been disputed, however, that peel strength is not a true measure of paint adhesion since it artificially introduces a film between the paint and the adhesion promoter to enable one to perform the test. In contrast, this paper discusses the use of a newly developed in-situ adhesion test, described as compressive shear delamination (CSD), to quantify the adhesive/cohesive propensity of coatings to a variety of TPO substrates. The effect of solvent type and chlorinated poly(olefin) (CPO) adhesion promoting resin on the adhesion/cohesion of topcoats to TPO is described. Chlorinated poly(olefin) type, followed by solvent variation, was shown to have the most significant impact on the adhesion/cohesion of topcoats. This newly described CSD protocol for determining the weak link in painted plastic may have a significant impact on the choice of topcoat, adhesion promoting primer formulation, and substrate in particular automotive applications. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5762 [article]

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Electrochemical study of lap-joint corrosion of steel with metallic coatings / A. Bautista in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 920 (09/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 920 (09/2001) . - p. 73-79 Titre : Electrochemical study of lap-joint corrosion of steel with metallic coatings Type de document : texte imprimé Auteurs : A. Bautista, Auteur ; José Antonio Gonzales, Auteur ; Eduardo Otero, Auteur ; M. Morcillo, Auteur Année de publication : 2001 Article en page(s) : p. 73-79 Note générale : Bibliogr. Langues : Américain (ame) Tags : Corrosion  Revêtement  métallique  Zingage  immersion  électrolytique  Impédance  Méthode  électrochimique  Bruit  Joint  recouvrement  Acier  galvanisé  Traitement  surface Index. décimale : 667.9 Revêtements et enduits Résumé : This paper analyzes the lap-joint corrosion susceptibility of steel with four different types of protective metallic coatings (hot-dip galvanized, galvannealed, electrogalvanized and 55% Al-Zn). Measurements are made using electrochemical impedance spectroscopy (EIS) and current electrochemical noise with specially designed sensors. The results obtained indicate the importance of the crevice water retention the risk of corrosion of lapped parts. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5763 [article]

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Colorant-induced exterior discoloration of latex paints / Lakshmi Sadasivan in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 920 (09/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 920 (09/2001) . - p. 81-86 Titre : Colorant-induced exterior discoloration of latex paints Type de document : texte imprimé Auteurs : Lakshmi Sadasivan, Auteur ; Usha R. Gandhi, Auteur Année de publication : 2001 Article en page(s) : p. 81-86 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  eau  émulsion  Feuil  Exposition  intempérie  Dégradation  chimique  Décoloration  Colorant  Pigment  minéral  Titane  Oxyde  Etude  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : Exterior discoloration of latex paint films has been attributed to known causes such as tannin and stain bleeding, mildew and sap staining, color fading and chalking due to certain pigments, and yellowing due to mildewcides and alkyd modification. This paper refers to exterior discoloration of latex paint films containing specific colorant(s). A simple and quick method was adopted to screen paint formulations that may discolor upon exposure to sunlight and water. The exterior discoloration of latex paint films tinted with raw umber colorant is primarily dependent on the manganese oxide(s) present as impurity in the colorant. The role of titanium dioxide in discoloration of raw umber containing latex paint films is also demonstrated. Using this method, the grades of titanium dioxide could be differentiated that facilitate exterior discoloration. A clear correlation was established between the types of surface treatment on titanium dioxide pigment (alumina, zirconia, or silica) versus colorant-dependent discoloration. The investigation demonstrates that the colorant-dependent discoloration is independent of binders, pigment volume concentrations, and mildewcide used in a formulation. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5764 [article]

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