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Importance of rheology in surface coating and its measurement / Deepti Shikha in PAINTINDIA, Vol. LXVI, N° 9 (09/2016)
[article]
Titre : Importance of rheology in surface coating and its measurement Type de document : texte imprimé Auteurs : Deepti Shikha, Auteur ; Ashwani Upadhyay, Auteur Année de publication : 2016 Article en page(s) : p. 56-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Revêtements:Peinture
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : In the paint and several other allied industries many methods and techniques have been developed to relate a flow quantity to a particular coating performance characteristics. Off the various physico-chemical properties studied in coating technology, rheology, a physical property play an important role in paint manufacturing. The knowledge of the rheology of materials and how to manipulate it through formulation is a vital tool in the optimization process. In addition to that, knowing about the various types of rheometer/viscometer, their conversion units, various factors on which it actually depends and its effect on different coating properties would be an added advantage. This review article discusses the concept of rheology, measurement and its application in surface coating. Note de contenu : - INTRODUCTION : Shear flow - Shear rate - Dimensions and units of viscosity - Types of non-newtonian fluid (most of the paints fall under this category)
- FLOW CURVES OR RHEOGRAMS : Rheograms for newtonian fluid - Bingham plastic
- FACTORS AFFECTING VISCOSITY : Flow condition - Temperature - Pressure - Concentration - Attractive force particle size
- RHEOLOGICAL MEASUREMENT IN SURFACE COATING
- TYPES OF VISCOMETER
- CAPILLARY : Glass capillary viscometer
- FLOW CUPS
- ROTATION-AL : The stormer viscometer - Brookfield viscometer - Parallel plate viscometer - Concentric cylinder-type viscometer
- FALLING SPHERE
- GARDENER TUBE VISCOMETER : ApplicationEn ligne : https://drive.google.com/file/d/1H_JhzoOpOipgGYCFAMhHcTatvfg20wOC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27496
in PAINTINDIA > Vol. LXVI, N° 9 (09/2016) . - p. 56-64[article]Réservation
Réserver ce documentUltrasonication for better pigment dispersion / Ashwani Upadhyay in PAINTINDIA, Vol. LXVII, N° 6 (06/2017)
[article]
Titre : Ultrasonication for better pigment dispersion Type de document : texte imprimé Auteurs : Ashwani Upadhyay, Auteur ; Shaifali Tyagi, Auteur Année de publication : 2017 Article en page(s) : p. 71-76 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cavitation
Dioxyde de titane
Dispersions et suspensions
Nanoparticules
Noir de carbone
Pigments
Polymères
Revêtements:Peinture
UltrasonsIndex. décimale : 667.2 Colorants et pigments Résumé : In paint industries one of the biggest challenges in the manufacturing process is to disperse nanoparticles into the vehicle, only the wel I separated nanoparticles can lead to unique new properties of the composite I ike a simultaneous improvement of toughness and stiffness already at very low filler contents. These particles are held together by attraction forces of various physical and chemical nature, including Van der Waals forces and liquid surface tension. This effect is stronger for higher viscosity liquids, such as polymers or resins. Different technologies are commonly used for the dispersing of powders into liquids. This includes high pressure homogenizers, agitator bead mills, impinging jet mills and rotor-stator-mixers. Another possibility is the dispersion by the help of ultrasonic waves. When sonicating liquids the sound waves that propagate into the liquid media result in alternating high-pressure and low-pressure cycles. This applies mechanical stress on the attracting electrostatic forces. Such jets press liquid at high pressure between the particles and separate them from each other. This review article discusses the use of ultrasonic waves in pigment dispersion, mechanism, and its application in paint industries. Note de contenu : - ULTRASONIC
- ULTRASONIC CAVITATIONS : Type of cavitations - Collapse of transient cavities
- ULTRASONIC DISPERSION EQUIPMENTS : Specifications : Lab ultrasonifictors instruments - The QS1 system - Titanium probes - The QS4 system - Titanium probes - Working - Factors affecting ultrasonication - Amplitude - Vapor pressure - Temperature - Viscosity and concentration - Power and intensity vs. energy - Surface tension - Air and gas content
- DEMONSTRATION OF ULTRASONIC MILLING AND DISPERSING EFFECTS BY MEANS OF SPECIFIC MATERIAL EXAMPLES : Titanium dioxide - Dispersion of nonmaterial's in polymers - Ultrasonic dispersion as compared to normal dispersion has following featuresEn ligne : https://drive.google.com/file/d/1AZbzkH87HvkQ15xmlsrYYQwsEH3elD51/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28980
in PAINTINDIA > Vol. LXVII, N° 6 (06/2017) . - p. 71-76[article]Réservation
Réserver ce document