| Titre : |
Pigment dispersion II, testing |
| Type de document : |
texte imprimé |
| Auteurs : |
Clifford K. Schoff, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 56 |
| Langues : |
Américain (ame) |
| Catégories : |
Dispersions et suspensions
Essais (technologie)
Floculation
Pâte pigmentaire
Pigments
Taille des particules
|
| Index. décimale : |
667.2 Colorants et pigments |
| Résumé : |
Pigment dispersion quality in pastes and paints may be tested by one of several different techniques. Probably the most common method in labs and plants is taking readings with a grind gauge, usually the Hegman type (ASTM D1210). The main reason for doing this for pastes usually is to see whether the dispersion process has reached the required end point for that pigment. Another reason would be to find out whether the dispersion equipment was adequate to achieve the target reading in a reasonable length of time. Hegman readings of 6 and 7 correspond to particle sizes of 25 and 12.5 mm, respectively, yet the average pigment particle size will be a fraction of that, perhaps as little as 1/10th. With a grind gauge, we only see the boulders, the largest particles (aggregates, agglomerates). Beginners find grind gauges frustrating to use and their precision is poor, but experienced users can produce rapid, repeatable, and meaningful results. |
| Note de contenu : |
- Fig. 1 : Photomicrograph of a pigment paste. Almost no individual particles are visible
- Fig. 2 : Paint made from the above paste. Individual particles are discernible along with loose clumps, which were easy to disperse |
| En ligne : |
https://drive.google.com/file/d/1EzjVGBicVAL1b0D2_47N6mgIPlZly_Kl/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34344 |
in COATINGS TECH > Vol. 17, N° 7 (07/2020) . - p. 56
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Pigment dispersion II, testing in COATINGS TECH, Vol. 17, N° 7 (07/2020)
