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Towards a new model for the calculation of CPVC in latex coatings / Ederley Vélez Ortiz in SURFACE COATINGS INTERNATIONAL, Vol. 98.3 (06/2015)
[article]
Titre : Towards a new model for the calculation of CPVC in latex coatings Type de document : texte imprimé Auteurs : Ederley Vélez Ortiz, Auteur ; Julià n A. Restrepo, Auteur Année de publication : 2015 Article en page(s) : p. 133-136 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Concentration pigmentaire volumique
Dioxyde de titane
Latex
Modèles mathématiques
Polydispersité
Polymères en émulsion
Revêtements:Peinture
Taille des particulesIndex. décimale : 667.9 Revêtements et enduits Résumé : This article leads to the development of a mathematical expression for calculation of the CPVC in latex coatings (LCPVC) in emulsions) as a function of the particle size relationship between the binder (or resin) and the pigmentary system present in the coatings.
Where revious works have related LCPVC to resin particle size, here the resin and the pigmentary system particle sizes are not consideres independently, and the expression which is deduced is a function of the ration between them.
By using an idealised "compact spheres model", based on the theoretical CPVC definition, a new model expression is developed to mathematically determine the LCPVC. The proposed model is semi-theoretical in nature, since it requires the use of constants which have been obtained experimentally by other authors.Note de contenu : - The concept of CPVC
- CPVC in latex paints
- Factors affecting CPVC : considerations for its mathematical formulation
- Deduction of a mathematical model
- Graphical analysisEn ligne : https://drive.google.com/file/d/1jjiGDZtmNDucIJzoM8IigKxQglZpRHgs/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24324
in SURFACE COATINGS INTERNATIONAL > Vol. 98.3 (06/2015) . - p. 133-136[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17311 - Périodique Bibliothèque principale Documentaires Disponible Tripigmented anticorrosive coatings based on lamellar zinc as inhibitor / A. M. Pereyra in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B3 (09/2006)
[article]
Titre : Tripigmented anticorrosive coatings based on lamellar zinc as inhibitor Type de document : texte imprimé Auteurs : A. M. Pereyra, Auteur ; Juan G. Castano, Auteur ; Félix EcheverrÃa, Auteur ; L. K. Herrera, Auteur ; Carlos A. Giudice, Auteur Année de publication : 2006 Article en page(s) : p. 245-249 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs
Composés lamellaires
Concentration pigmentaire volumique
Essais de brouillard salin
Inhibiteurs (chimie)
Pigments
Primaire (revêtement)
Statistique
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : The objective of this work was to study the behaviour of zinc primers, containing either lamellar zinc alone or lamellar zinc mixed with an extender or with an extender/inhibitor mixture. Several formulations of coatings were designed. Accelerated tests were carried out by means of a salt-spray (fog) chamber and a 100% relative humidity cabinet. A statistical analysis was performed considering simultaneous ways of dry-film blistering resistance and anticorrosive behaviour. Results indicated that it was possible to incorporate an extender of high-oil absorption as a spacer of the lamellar zinc particles and also an inhibitor to improve the performance. Note de contenu : - Formulation and manufacture of primers : Inhibiting pigment and extender - Film-forming material - Pigment composition - Pigment volume concentration - Pigment dispersion
- Experimental method
- Table 1 : Characteristics of metallic zinc inhibiting pigment and extender
- Table 2 : Identification of modified primers
- Table 3 : Composition of sealer, percentage in weight
- Table 4 : Lamellar zinc-rich coatings. Salt fog chamber (ASTM B 117, 1500 hours). Degree of rusting, ASTM D 1654
- Table 5 : Modified lamellar zinc. Salt fog chamber (ASTM B 117, 1500 hours). Degree of rusting, ASTM D 1654
- Table 6 : Lamellar zinc-rich coatings. 100 % relative humidity chamber (ASTM D 2247, 5OO hours). Degree of blistering, ASTM D 714
- Table 7 : Modified lamellar zinc. 100 % relative humidity chamber (ASTM D 2247, 500 hours). Degree of blistering, ASTM D 714
- Table 8 : Sum values of degree of rusting and degree of blistering for the lamellar zinc primersDOI : 10.1007/BF02699667 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699667.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5284
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 89, B3 (09/2006) . - p. 245-249[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 005574 - Périodique Bibliothèque principale Documentaires Disponible Use of thermally stimulated current to measure properties of coatings / C. A. Kumins in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 835 (08/1994)
[article]
Titre : Use of thermally stimulated current to measure properties of coatings Type de document : texte imprimé Auteurs : C. A. Kumins, Auteur ; C. J. Knauss, Auteur ; R. J. Ruch, Auteur Année de publication : 1994 Article en page(s) : p. 79-84 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Adsorption
Carbonate de calciumLe carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole.
C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots.
Chlorure de polyvinyle
Concentration pigmentaire volumique
Copolymères
Couches minces
Polyacrylates
Revêtements:Peinture
TempératureIndex. décimale : 667.9 Revêtements et enduits Résumé : Both neat and calcium carbonate (CaCO3) filled films of an acrylate latex terpolymer with one percent free acid groups were cast on aluminum foil. Films of varying degrees of adhesion to aluminum were studied by measuring thermally stimulated current (TSC) as a function of temperature, film thickness, and degree of pigment loading. Films with the best adhesion gave the highest values of TSC over a large temperature range and also a large increase in TSC as the films delaminated. Duplicate measurements of TSC versus temperature for the same film gave good reproducibility. TSC curves of the neat polymer films gave a peak near the glass transition temperature (Tg) of the latex. The pigmented polymer films gave a peak about 5°C above the Tg of the latex.
The terminus of the interphase region for the neat polymer was in the range of 250-350 microns. Extrapolation to zero TSC for the filled system gave a pigment volume concentration (PVC) near 38%, which was postulated to be a measure of the critical pigment volume concentration (CPVC).Note de contenu : - RESULTS : Degree of adhesion - Noise - Reproducibility - Current peaks - Film thickness Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18681
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 835 (08/1994) . - p. 79-84[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003469 - Périodique Bibliothèque principale Documentaires Disponible 003482 - Périodique Bibliothèque principale Documentaires Exclu du prêt Wavelength dependence of Kubelka–Munk scattering spectra for studies of TiO2 microstructure and aggregation in paints / Nick J. Elton in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 4 (07/2014)
[article]
Titre : Wavelength dependence of Kubelka–Munk scattering spectra for studies of TiO2 microstructure and aggregation in paints Type de document : texte imprimé Auteurs : Nick J. Elton, Auteur ; Anabelle Legrix, Auteur Année de publication : 2014 Article en page(s) : p. 555-566 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Concentration pigmentaire volumique
Dioxyde de titane
Floculation
Mie, Diffusion de
Précipitation (chimie)
Réflectance
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : The wavelength exponent β is easily determined from diffuse reflectance spectra as the gradient of a log–log plot of the Kubelka–Munk scattering coefficient (S) against wavelength. Previous work suggests that β provides a useful relative measure of the size of scattering units applicable to many particulate systems. This article examines the applicability of β to paints, specifically studies of TiO2 aggregation, and comments on its wider use for pigmented coatings. Modelling using multisphere T-matrix Mie methods shows that β varies nearly linearly with the mean aggregate size. Experimental data shows good correlation between the state of aggregation and β. However, β depends strongly on the volume fraction of TiO2 owing to the effects of dependent scattering arising from crowding, therefore comparisons between paints can only be made at constant effective TiO2 volume fraction. A simple effective medium refractive index model in conjunction with Mie scattering appears to give a good account of the behavior of both S and β with increasing TiO2 volume concentration. When air is incorporated into the coatings at high pigment volume fractions, scattering is much more complicated. In this case it appears very difficult to relate β directly to coating microstructure properties such as pore diameter. Note de contenu : - THEORY
- MODELLING : Method - Single particles - Aggregates
- EXPERIMENTAL
- EXPERIMENTAL RESULTS : Paints below the CPVC - Paints above the CPVCDOI : 10.1007/s11998-014-9567-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9567-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21716
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Code-barres Cote Support Localisation Section Disponibilité 16424 - Périodique Bibliothèque principale Documentaires Disponible What is the meaning of pigment volume concentration ? / Michael Groteklaes in EUROPEAN COATINGS JOURNAL (ECJ), N° 1-2/00 (01-02/2000)
[article]
Titre : What is the meaning of pigment volume concentration ? : An introduction into the basic mechanisms of PVC and CPVC in a coating formulation Type de document : texte imprimé Auteurs : Michael Groteklaes, Auteur Année de publication : 2000 Article en page(s) : p. 72-74 Langues : Anglais (eng) Catégories : Concentration pigmentaire volumique
Concentration pigmentaire volumique critique
Formulation (Génie chimique)
Revêtements:PeintureIndex. décimale : 667.2 Colorants et pigments Note de contenu : - What happens when PVC increases ?
- Three characteristic parameters ?
- Fig. 1 : Morphological appearance of a coating below the CPVC
- Fig. 2 : Morphological appearance of a coating at the CPVC
- Fig. 3 : Morphological appearance of a coating above the CPVC
- Fig. 4 : Change in some coating properties as a functio of the PVCPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33515
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Code-barres Cote Support Localisation Section Disponibilité 000612 - Périodique Bibliothèque principale Documentaires Disponible 004803 - Périodique Bibliothèque principale Documentaires Disponible Permalink