| Titre : |
Optimising pigment distribution : How interactions of coatings componenfs affect TiO2 efficiency |
| Type de document : |
texte imprimé |
| Auteurs : |
Immanuel Willerich, Auteur ; Volodymyr Boyko, Auteur ; Markus Rückel, Auteur ; Jules Mikhael, Auteur ; Nicholas Foley, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 50-55 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Agents dispersants (chimie)
Chimie analytique
Chlorure de polyvinyle
Dioxyde de titane
Dynamique moléculaire
Epaississants
Formulation (Génie chimique)
Liants
Opacité (optique)
Pigments
Polyacryliques
Polyuréthane éthoxylé modifié de façon hydrophobe
Revêtements:Peinture
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Understanding the interactions in paints and coatings by ad-vanced analytical methods can help improve properties such as TiO2 usage and hence opacity. It is shown for example why cellulosic thickeners do not create uneven TiO2 distribution but associative thickeners may do so, depending on the choice of dispersant. |
| Note de contenu : |
- A holistic approach to studying interactions
- HEC thickeners show uneven distribution in wet state
- But pigment distribution is more even when dry
- Problems and solutions in optimising TiO2 usage
- Associative thickeners make dispersant choice critical
- Effects of associative thickener further confirmed
- Binder-pigment interactions can also be observed
- Practical value of analytical techniques summarised
- FIGURES : 1. Coating constituents in a model paint and their molecular level interactions - 2. Pigment and water distribution as visualised by CLSM ; Top Left : Bright spots are TiO2 particles in wet state visualised by reflectance ; Top Right : Bright spots are water-rich areas stained by a fluorescent water-soluble dye ; Bottom left : dry TiO2 particle distribution ; Bottom right : Model formulation with PVC 20 (HEC: 1 Mio. g/mol, HEUR : low shear) - 3. TiO2 distribution and binder-pigment interaction - 4. Comparison of dispersant-thickener interaction for polyacid and copolymer dispersants in dry straight acrylic model paints containing a HEUR instead of the HEC thickener. Recipe from Fig. 2, acrylic binder - 5. X-ray disc centrifugation of TiO2-binder composites : TiO2 interaction increases in the order A
- TABLES : 1. Characterisation of paints with polyacid versus (hydrophobe containing) copolymer dispersants. Spreading rates ah 9 8 % contrast ratio measured according to DIN IS0 13300, rheology measured wiTh Anhon Paar "MCR 302" - 2. Quantitative XDC analysis of pigment composites with binders A, B and C, scattering coefficient and contrast ratio of a commercial PVC 35 paint determined with 7 and 40 mil wet drawdowns |
| En ligne : |
https://drive.google.com/file/d/1FYloEqq_Glj0DEgPtlmwH56FECCc_aQq/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30589 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 5 (05/2018) . - p. 50-55
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Optimising pigment distribution in EUROPEAN COATINGS JOURNAL (ECJ), N° 5 (05/2018)
