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Effect of carbon black on adhesion to plastics in solventborne 2K polyurethanes / Kalpana S. Katti in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 903 (04/2000)
[article]
Titre : Effect of carbon black on adhesion to plastics in solventborne 2K polyurethanes Type de document : texte imprimé Auteurs : Kalpana S. Katti, Auteur ; Marek W. Urban, Auteur Année de publication : 2000 Article en page(s) : p. 35-44 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Peinture Uréthanne polymère Pigment minéral Noir carbone Concentration pigmentaire volumique Réticulation Adhérence Matière plastique ABS Etude expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : These studies show that when the pigment volume content (PVC) of carbon black particles increases in polyurethanes (PUR), NCO consumption increases, and the extent of H-bonded C=O species near the film-substrate (F-S) interface is enhanced. During crosslinking, polyurea (PUA) is produced, and its concentration levels near the F-S interface are diminished for unpigmented coatings, whereas for the same system containing carbon black, the PUA formation is enhanced. Although the presence of carbon black particles at the F-S interface results in diminished adhesion of 2K PUR to acrylonitrile-butadiene-styrene (ABS), adhesion is also affected by the presence of OH and C=O functionalities on ABS, which are potential sites for H- bonding to PUR. Stronger hydrogen donor affinity of N-H functionalities in PUA as compared to the N-H groups on PUR leads to increased H-bonding in the presence of carbon black. Enhanced intermolecular H-bonding in PUR due to the presence of carbon black particles competes with the F-S interfacial H-bonding that promotes adhesion. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5815
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 903 (04/2000) . - p. 35-44[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001208 - Périodique Bibliothèque principale Documentaires Disponible 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)
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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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3788
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Code-barres Cote Support Localisation Section Disponibilité 003121 - Périodique Bibliothèque principale Documentaires Disponible 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)
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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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3789
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 8 (10/2005) . - p. 635-647[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003121 - Périodique Bibliothèque principale Documentaires Disponible