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Titre : Coverage uncovered : Measurement of wet opacity and paint-drying profiles Type de document : texte imprimé Auteurs : Helen Dollani, Auteur ; Anabelle Elton-Legrix, Auteur Année de publication : 2021 Article en page(s) : p. 40-45 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux)
Concentration pigmentaire volumique critique
Dioxyde de titane
Mesure
Opacité humide
Réfraction, Indice de
Revêtements -- Additifs:Peinture -- Additifs
Revêtements décoratifs:Peinture décorativeIndex. décimale : 667.9 Revêtements et enduits Résumé : Wet opacity is key to many coatings applications, especially for formulations with reduced titanium dioxide content. A rapid way to measure wet opacity straight after application has been developed. Note de contenu : - Development of a wet opacity test method
- Non-contact measurement
- High accuracyand excellent correlation with visual assessments
- Wet opacity rises with TiO2 content
- Fig. 1 : Measurement of wet opacity using
- Fig. 2 : Comparison of X-rite and bench-top wet opacity at various spreading rates
- Fig. 3 : Wet opacity vs. TiO2 content in commercial paints
- Fig. 4 : Wet opacity vs. visual assessments and mineral/pigment refractive index (RI)
- Fig. 5 : Zero and low TiO2 wet opacity measurements at various spreading rates
- Fig. 6 : Drying curve of paints at various PVCs
- Fig. 7 : Influence of binder type for 66% PVC decorative paint
- Table 1 : Comparison X-rite VS450 and benchtopspectrophometer measurementsEn ligne : https://drive.google.com/file/d/1BeBYBWIFn_P5v_7c6x0Wi2CkZAHQCqCR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36420
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 10 (10/2021) . - p. 40-45[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23000 - Périodique Bibliothèque principale Documentaires Disponible Critical Pigment Volume Concentration (CPVC) / M. Veeramani in PAINTINDIA, Vol. LXX, N° 2 (02/2020)
[article]
Titre : Critical Pigment Volume Concentration (CPVC) Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2020 Article en page(s) : p. 88-92 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Concentration pigmentaire volumique critique
Dioxyde de titane
Opacifiants
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.6 Peintures Résumé : During the last fifty years, different methods were proposed to determine CPVC, many of which based on the change of coating properties (for example film density). In practice, the following two methods are the most used : the Gilsonite method and the film tension test. The Gilsonite method is based on the ability to stain the coating using a 10% solution of Gilsonite (trade name of natural bitumen) in white spirit. With the PVC value increasing, the intensity of the stain increases, obtained by soaking the paint test tube in the Gilsonite solution. The higher the PVC value, the higher the stain intensity. Visibly CPVC matches PVC at the point in which the soaked area has the same colour as the non-soaked one. As an alternative, the film tension test is based on the tension produced in a paint film during the solvent evaporation. This tension causes a shrinkage in the film which wilI be greater or smal ler based on the hardness of the binder, and wiII be greatest when PVC matches CPVC. Note de contenu : - Factors influencing CPVC
- How do pigments generate hiding power ?
- Efficiency of various white powders at scattering light
- Titanium dioxide and hiding power
- Why are some pigments better than others in hiding power ?
- Table : Experimental data of oil and water absorption valuesEn ligne : https://drive.google.com/file/d/1-gHy5lKBgRePZhoEMS-GfC-iXwB1WDw_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34689
in PAINTINDIA > Vol. LXX, N° 2 (02/2020) . - p. 88-92[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22390 - Périodique Bibliothèque principale Documentaires Disponible Critical pigment volume concentration measurements... A very fast method / Walter K. Asbeck in COATINGS TECH, Vol. 2, N° 14 (03/2005)
[article]
Titre : Critical pigment volume concentration measurements... A very fast method Type de document : texte imprimé Auteurs : Walter K. Asbeck, Auteur Année de publication : 2005 Article en page(s) : p. 64-66 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique
Concentration pigmentaire volumique critique
MesureIndex. décimale : 667.9 Revêtements et enduits Résumé : Because of the importance of knowing the Critical Pigment Volume Concentration (CPVC) for maximum performance of ail pig¬mented coating systems, a large number of methods to measure CPVC have been proposed. All at¬tempts to predict the critical point on theoretical grounds have been unsuccessful. Some tests for CPVC are quite accurate and reliable in showing where the break in the for¬mulating ladder exists. Some re¬quire considerable judgment.
All tests for CPVC, unfortunately, require the preparation of the coat¬ing compositions, induding pig¬ments used, vehicles (both solution and latex type), and their grinds. The composition must then be de¬posited on some substrate and dried—either by air or bake—before the classical tests can be used. All facets of the coatings manufacture must be induded in the test sam¬pies. The required sample may be produced relatively fast in the case of baked systems or very slow in the case of some air-dried systems.
Ail of the classical tests made on these PVC ladders are relatively time consuming and total testing time may require many hours. A new method of testing on the PVC ladder, which is both veryfast and requires minimal instrumentaion, is proposed here. For the most part, the tests on each sample can be made in less than one minute.
Note de contenu : - Critical Pigment Volume Concentration measurements - A very fast method
- A new test method
- Table 1 : Possible test methodsEn ligne : https://drive.google.com/file/d/1ethbd5ntriuH4C-_Xst2Dzty3DMeEpGt/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40683
in COATINGS TECH > Vol. 2, N° 14 (03/2005) . - p. 64-66[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000554 - Périodique Bibliothèque principale Documentaires Disponible How paint quality impacts carbon footprint / Steven de Backer in EUROPEAN COATINGS JOURNAL (ECJ), N° 1 (01/2022)
[article]
Titre : How paint quality impacts carbon footprint : Highly treated grades of TiO2 can improve the cradle-to-grave ecological impact Type de document : texte imprimé Auteurs : Steven de Backer, Auteur ; Michael P. Diebold, Auteur Année de publication : 2022 Article en page(s) : p. 30-34 Langues : Anglais (eng) Catégories : Concentration pigmentaire volumique critique
Dioxyde de titane
Durée de vie (Ingénierie)
Lumière -- Diffusion
Produits chimiques -- Consommation -- Réduction
Revêtements -- Aspect de l'environnement
Revêtements en bâtiment:Peinture en bâtimentIndex. décimale : 667.9 Revêtements et enduits Résumé : Coatings provide both protection and aesthetic appeal. Just a thin layer of paint can extend the useful life of everyday objects, avoiding the environmental burden that would corne with an early replacement. Assessing the sustainability of coatings over the entire product life cycle better captures the impact of coatings performance in a given application. Highly treated grades of TiO2 increase scattering efficiency, reduce the required paint volume and offer a lower carbon footprint. Note de contenu : - Greater efficiency at critical pigment volume concentration
- Light scattering improved by 30 % with less TiO2
- Increasing air void content increases opacity at same porosity index
- Use of highly treated TiO2 in paint systems
- Lower carbon footpring with highly treated grade
- Fig. 1 : LCA cycle for a typical architectural paint
- Fig. 2 : Microscopic pictures of highly treated TiO2 and a universal type
- Fig. 3 : Relative scattering power as a function of TiO2 particle separation
- Fig. 4 : Impact of concentration on hiding power of universal and highly treated Ti02 grades
- Fig. 5 : Spread rate as a function of air content in paints formulated above the CPVC
- Fig. 6 : Overview of basic paint properties of three plaints with clays (A), fine CaCO3 (B) and medium-sized CaCO3 as extender, for¬mulated using a universal and a highly treated TiO2 grade
- Fig. 7 : Pore volume as a function of pore sizes for three paints differing in extender package containing a universal and highly treated TiO2En ligne : https://drive.google.com/file/d/14OupRmUA63L-jWlcmtDaQStEziuuDGo3/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36847
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 1 (01/2022) . - p. 30-34[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23172 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Inorganic extenders - Part 2 Type de document : texte imprimé Auteurs : Ankush Trivedi, Auteur ; Akanksha Trivedi, Auteur ; P. K. Kamani, Auteur Année de publication : 2018 Article en page(s) : p. 63-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés inorganiques
Concentration pigmentaire volumique critique
Dureté (matériaux)
Extendeurs
Extendeurs -- Propriétés chimiques
Réfraction, Indice deIndex. décimale : 667.9 Revêtements et enduits Résumé : Extender pigments are much lower in price than prime pigments and are used in paints primarily to reduce cost. However, by careful selection of the particular type of extender for specific paints it is often possible to improve certain properties of the paint or the dry coating. Proper choice of extender may improve properties such as consistency, leveling, and pigment settling in the paint. Certain extenders reinforce the structure of dry coating mechanically, while others increase its resistance to the transmission of moisture.ln paints with high pigment concentration sufficient hiding may be obtained by replacing sonne of the opaque pigments with extender pigment. Detailed knowledge of the various types and grades of extenders will enable the paint formulator to produce paints having maximum properties at minimum cost.Numerous properties of extenders are discussed here along with their suitable end applications. Note de contenu : - Hardness
- Chemical effects
- Refractive index
- Engineering aspects - fill and CPVCEn ligne : https://drive.google.com/file/d/1AnYqSQq8DT2Fyw6Bdmk2KAdXVGAoDKC8/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30692
in PAINTINDIA > Vol. LXVIII, N° 3 (03/2018) . - p. 63-72[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19991 - Périodique Bibliothèque principale Documentaires Disponible PermalinkUnderstanding matting mechanisms and challenges in conventional coatings / Bhushan Lokegaonkar in PAINTINDIA, Vol. LXXI, N° 4 (04/2021)
PermalinkUse of MieLab software in scattering calculations / Daniel C. Kraiter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)
PermalinkWhat is the meaning of pigment volume concentration ? / Michael Groteklaes in EUROPEAN COATINGS JOURNAL (ECJ), N° 1-2/00 (01-02/2000)
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