Waterborne latex coatings of color : I. Component influences on viscosity decreases / David M. Mahli in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 8 (10/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 8 (10/2005) . - p. 627-634 Titre : Waterborne latex coatings of color : I. Component influences on viscosity decreases Type de document : texte imprimé Auteurs : David M. Mahli, Auteur ; J. Edward Glass, Auteur ; Jon M. Wegner, Auteur Année de publication : 2005 Article en page(s) : p. 627-634 Note générale : Bibliogr. Langues : Américain (ame) Tags : Polymère  associatif  Propriété  rhéologique  Ether  cyclique  polymère  Etude  expérimentale  Maléique  acide  copolymère  Ethylène  oxyde  Oligomère  téléchélique  Colorant  Noir  carbone  Viscosité  cisaillement  Relation  formulation  propriété  Agent  surface  Epaississant  Matériau  revêtement  Peinture  eau Index. décimale : 667.9 Revêtements et enduits Résumé : For almost two decades, it has been known that the addition of colorants to a waterborne latex coating thickened with an associative thickener will result in a viscosity loss. The influence of surfactants on viscosity variations in waterborne latex coatings, as discussed in our most recent fCT COATINGSTECH article, is the source of the viscosity decreases. To evaluate this problem, aqueous solutions containing large quantities of five different surfactants, and the smallest particle size of the colorants, carbon black (CB), were prepared. Large quantities of surfactant were used to allow for adsorption on, and stabilization of, CB. When traditional associative polymers (HMHEC, HASE, and a telechelic HEUR) were used to thicken carbon black dispersions, viscosity decreases were not observed, for most of the surfactant is adsorbed on the CB's surface. There is enough surfactant, however, to promote viscosity decreases in comb-HEUR thickened CB dispersions. Moving beyond the colorant dispersions, the CB, yellow, or red colorants were then added to a commercial latex paint that contains many surfactants, glycol ether, and coalescing aids, and significant viscosity decreases were observed. The decreases were very dramatic as the colorant concentration was increased to obtain deeper color tones, due to the additional excess surfactant added to the coating. Reduction in total surfactant levels in the colorant was an obvious solution, but this led to rub-up incompatibility. The conflict between viscosity retention and rub-up incompatibility was resolved when the surfactant concentration was reduced by adding to the colorant formulation compositionally different hydrophobically-modified poly(oxyethylenes) and hydrophobe-modified maleic acid co-oligomers. DOI : 10.1007/BF02774592 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774592.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3788 [article]

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Waterborne latex coatings of color : II. Surfactant influences on color development and viscosity / David M. Mahli in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 8 (10/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 8 (10/2005) . - p. 635-647 Titre : Waterborne latex coatings of color : II. Surfactant influences on color development and viscosity Type de document : texte imprimé Auteurs : David M. Mahli, Auteur ; Jon M. Wegner, Auteur ; J. Edward Glass, Auteur ; Daniel G. Phillips, Auteur Année de publication : 2005 Article en page(s) : p. 635-647 Note générale : Bibliogr. Langues : Américain (ame) Tags : Propriété  rhéologique  Cellulose  éther  dérivé  Etude  expérimentale  Couleur  optique  Viscosité  cisaillement  Relation  formulation  propriété  Cellulose(hydroxyéthyl)  Peinture  émulsion  Talc  Pigment  minéral  Agent  surface  anionique  Noir  carbone  Dimension  particule  Epaississant  non  ionique  Matériau  revêtement  eau Index. décimale : 667.9 Revêtements et enduits Résumé : A matrix of coating variables, nonassociative versus associative thickeners, different latex median particle sizes, individual surfactants and colorants [carbon black (CB), red, and yellow pigments], was examined for their influence on variances in coatings rheology and color development. Within the different coating groups, the variable of interest in this study was the surfactant added to the colorant formulation. In all three colorant formulations, sodium dodecyl sulfate (an anionic surfactant) provided poorer color development (CD) than in applied formulations containing an equivalent nonylphenol oxyethylene (EO) surfactant. In CB formulations, nonionic surfactants with higher EO content provide improved color development at low (2 mM) concentrations, but near equality in CD is achieved with low EO surfactants at higher concentrations, in contrast to CB formulations, red and yellow colorants exhibit good color development with high EO content nonionic surfactants only at low nonionic surfactants concentrations. This variance appears to be related to the interactions of surfactants with inorganic pigments (talc and laponite) in the colorant formulation. The coating's rheology is related to latex, thickeners, and surfactant components of the paint, as has been noted in previous studies, but not to the nature of the color pigment. The viscosity of the hydroxyethyl cellulose (nonassociative type) and HEUR (associative type) thickened paint decreased with colorant addition due to dilution effects. There were no unusual deviations with the NP(EO)x surfactants, except when a large hydrophobe nonionic surfactant [e.g., C18H37(EO)100] is added. In HEC thickened coatings, the viscosity decreases when C18H37-(EO)100 is in the colorant due to that surfactant inhibiting depletion flocculation. In the C18H37(EO)100 coatings containing the HEUR thickener, significant increases in viscosity were observed, above the dilution values observed with the colorant addition. This is related to the viscosity maximum in the low concentration of HEUR with the C18H37(EO)100 surfactant. Color development is independent of the viscosity profile of the coating. DOI : 10.1007/BF02774593 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774593.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3789 [article]

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Waterborne latex coatings of color. III. Triblock polyether influences on color development and viscosity / David M. Mahli in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 1 (03/2007)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 4, N° 1 (03/2007) . - p. 31-41 Titre : Waterborne latex coatings of color. III. Triblock polyether influences on color development and viscosity Type de document : texte imprimé Auteurs : David M. Mahli, Auteur ; Daniel G. Phillips, Auteur ; J. Edward Glass, Auteur ; Jon M. Wegner, Auteur Année de publication : 2007 Article en page(s) : p. 31-41 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants Epaississants Formulation (Génie chimique) Latex Noir de carbone Polyéthylène glycol Polyoxypropylène Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Surfactants Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Oxyethylene (PEO)/oxypropylene (PPO) triblock polymers are added to colorant formulations to determine the influence of molecular weight and other structural variances on the rheology and color development of tinted latex paints. Waterborne coatings are a matrix of many coating components. In this study, a 108- or a 600-nm latex was thickened with a nonassociative thickener, hydroxyethyl cellulose, or an associative telechelic HEUR thickener. Triblock polymers with internal PPO segments and PEO terminal segments added as a dispersant to colorant packages, lead to better color development than PPO/PEO/PPO triblocks dispersants in carbon black (CB) tinted paints. The increase in color development with high molecular weight (MW) triblocks starts at a very low concentration (2 mM) and plateaus in a Langmuir-type adsorption isotherm. Lower molecular weight triblock polymers also exhibit this behavior in CB-, red-, and yellow-tinted latex coatings; however, increasing the terminal PEO segment sizes leads to better color development only in the CB-tinted coatings. With large PEO terminal units red and yellow tints are high only at very low concentrations (2 mM) of the triblock. This parabolic response in color development, in contrast to CB-tinted formulations, is attributed to the high surface area and porosity of CB that limits the amount of large PEO segments interacting with the talc particle present at twice the volume fraction of the colorant. With the lower surface areas of the red and yellow colorants, the interaction of the large PEO terminal segments with talc particles accounts for the limited triblock concentration for which good color development is observed. This can be reversed by decreasing or eliminating talc from the formulation. DOI : 10.1007/s11998-007-9007-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9007-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3668 [article]

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