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Conservation concerns for acrylic emulsion paint coatings / M. Veeramani in PAINTINDIA, Vol. LXXII, N° 5 (05/2022)
[article]
Titre : Conservation concerns for acrylic emulsion paint coatings Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2022 Article en page(s) : p. 92-94 Langues : Anglais (eng) Catégories : Décoloration
Formation de film
Jaunissement (défaut)
Oxydation
Pigments
Polyacryliques
Porosité
Réticulation (polymérisation)
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements en phase aqueuse:Peinture en phase aqueuse
Revêtements organiquesIndex. décimale : 667.6 Peintures Résumé : The basic process of film coalescence has been described frequently in the conservation and paint industry literature, though technologists acknowledge the over-simplification of this model and the need for further research. Acrylic emulsions are composed of particles of amorphous polymer suspended in water. The two-phased system is held in suspension by surfactants and/or other surface stabilisers. During drying, water evaporates to draw the spherical polymer particles Gloser, which then meld together to form a 'honeycomb' network. A coalescing-solvent additive ensures that the polymer particles remain malleable during — and after— this process, to produce more complete compaction, even after the water has evaporated. Eventually, the boundaries between particles become barely detectable and the film is considered continuous. However, it has been shown that pores or micro-voids are often left within the film, readily seen with light microscopy and SEM. minimum film formation temperature (MFT), modulus of elasticity and viscosity of the resin, as well as the function of additives such as coalescing agents. Paints left to dry slightly below their Tg and MFT wi II result in films of h igher porosity. A paint drying significantly below its Tg will form a loose, powdery layer.
Note de contenu : - Paint properties - Film formation
- Film porosity and pin-holes
- Haziness
- Thermo plasticity
- Properties of additives
- Ageing properties : Yellowing/discoloration
- Cross-linking and oxidation
- Effect of pigments
- Affinity for dirt pick-up
- Sensitivity to solvent
- Sensitivity to waterEn ligne : https://drive.google.com/file/d/1Zo1kAgDw2np8uJc2u-Jrs-MIHqjfEewS/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37803
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Code-barres Cote Support Localisation Section Disponibilité 23454 - Périodique Bibliothèque principale Documentaires Disponible Conservation concerns for acrylic emulsion paint coatings / M. Veeramani in PAINTINDIA, Vol. LXXII, N° 4 (04/2022)
[article]
Titre : Conservation concerns for acrylic emulsion paint coatings Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2022 Article en page(s) : p. 88-90 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dispersions et suspensions
Hydrophobie
Latex
Liants
Liants en phase aqueuse
Polyacryliques
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Acrylic emulsion artists' paints were received with much fanfare and excitement in the 1950s and 1960s. They embodied the characteristics that many artists had been searching for at that time, affording a means of expression that was distinct from oi I painting and its associated history and traditions. As described it, 'there was an urge to loosen painting. [These colours] released new kinds of tactile qualities'. These synthetic paints produced films of great clarity and phenomenal elasticity, were easy to manipulate, could be painted directly onto supports, dried quickly, were thinned with water and exhibited high resistance to ultraviolet degradation. It was changed to acrylics for a number of reasons. They dry faster, which they do, and that they retain their original colour, which they do.The durability and light and the fact that one can use water instead of turpentine : all that makes it easier given the abstract image. As painting needed less and less drying time, depth, and so forth, the materials came along that made that more obvious. In spite of their outstanding mechanical and aging properties, acrylic emulsion paintings do suffer damage, often through external influences. Within the conservation profession, concerns were soon raised as some of these newly painted works began to require cleaning and repair. Note de contenu : - The development of water-borne acrylic artists paints
- Additives : Additives in the emulsion binder - Additives utilised by paint formulators to achieve the intended performance propertiesEn ligne : https://drive.google.com/file/d/10e316ikP9GPmDBwR93LlTimMo4BhiupC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37748
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Code-barres Cote Support Localisation Section Disponibilité 23453 - 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
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Code-barres Cote Support Localisation Section Disponibilité 22390 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Defoamer - a critical view : Waterbased paints - 58 Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2019 Article en page(s) : p. 96-100 Langues : Anglais (eng) Catégories : Antimousse
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- AdditifsIndex. décimale : 667.6 Peintures Résumé : In this series of critical analysis of various additives, so far we have covered dispersants and wetting & surfactants. We now move on to the next important additive called defoamer. One might find that some repetitions of certain portions of the earlier write up, but they are further elabored here. Moreover it will help the reader for better continuity and understanding the concept better. Note de contenu : - DEFOAMING BY ADDITIVES
- CLASSIFICATION : Oil based defoamers - Powder defoamers - Water based defoamers - Silicone based defoamers - EO/PO based defoamers - Alkyl polyacrylates
- Fig. 1 : Drying of foam bubble (drainage effect)
- Fig. 2 : Stabilisation of foam bubble by surfactants
- Fig. 3 : Penetration of defoamer into the lamella of the foam bubble
- Fig. 4 : Effect of hydrophobic solid particlesEn ligne : https://drive.google.com/file/d/1YROImmImckhuRBjdNziaSP8051QFdmiN/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33630
in PAINTINDIA > Vol. LXIX, N° 10 (10/2019) . - p. 96-100[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21459 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Dispersion principles you should know Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2023 Article en page(s) : p. 108-110 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents dispersants (chimie)
Dispersions et suspensions
Revêtements (produits chimiques):Peinture (produits chimiques)
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : It takes great pleasure to inform the readers that th is is my 102nd chapter. I am trying to touch upon many topics under the water based paints, in addition I am dealing with some fringe topics that has relevant to the core subject. I will try to cover as much as possible to give enough information to the readers especially from the small-scale sector. Note de contenu : - HOW DOES A DISPERSANT WORK ? : Electrostatic repulsion - Steric repulsion
- WHY ARE THERE SO MANY DIFFERENT COMMERCIAL DISPERSANTS TO CHOOSE FROM ?
- WHAT ARE THE KEY SELECTION CRITERIA FOR DISPERSING AGENTS ? : Choose the best fitted stabilization method
- ANCHOR SITES AT THE SURFACE OF YOUR PIGMENTS AND FILLERS
- GOOD BINDER COMPATIBILITY
- DIFFERENT TYPES OF DISPERSING AND THEIR CHEMISTRIES
- CONVENTIONAL DISPERSING AGENTS : High molecular mass dispersants
- HIGH VERSUS LOW MOLECULAR MASS-BASED DISPERSANTSEn ligne : https://drive.google.com/file/d/1H5sTPdjrc2_UYVhL7C0Jzh9XTQ0KEYTy/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40055
in PAINTINDIA > Vol. LXXIII, N° 7 (07/2023) . - p. 108-110[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24178 - Périodique Bibliothèque principale Documentaires Disponible PermalinkPermalinkPermalinkDispersion : principles you should know : Selecting the right dispersant / M. Veeramani in PAINTINDIA, Vol. LXXXIII, N° 11 (11/2023)
PermalinkEffect of particle size of extenders in water based paints - a critical view / M. Veeramani in PAINTINDIA, Vol. LXIX, N° 11 (11/2019)
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