| 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
Ultrasons
|
| Index. 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 features |
| En ligne : |
https://drive.google.com/file/d/1AZbzkH87HvkQ15xmlsrYYQwsEH3elD51/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| 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
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