[article]
| Titre : |
MODAFLOW NSR 100, a novel nanosilica additive for excellent scratch resistance |
| Type de document : |
texte imprimé |
| Auteurs : |
M. Goedegebuure, Auteur ; M. P. E. Benjert, Auteur ; Francesca Fallani, Auteur ; E. de Wolf, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 194-199 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Autobus -- Peinture
Essais de résilience
Essais dynamiques
Nanoparticules
Polyacryliques
Polyesters
Résistance à l'abrasion
Revêtements -- Additifs:Peinture -- Additifs
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
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| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
While visual appearance represents one of the most important criteria when buying a car, an item of furniture or other life style object, surface robustness makes all the difference when it cornes to daily use, such as washing your car or polishing your home furniture.
High gloss appearance of automotive coatings, in fact, can be affected by micro-scratches, which are invisible to the naked eye, but result in a substantial loss of gloss because of a change in reflection of light (scattering), particularly visible on dark colours (basecoats) in the sunlight. Such scratches occur for instance because of (automatic) carwashes and are mainly due to dirt particles, not so much to the bristle hairs. The same dirt particles can also scratch the coating when driving and/or during harsh weather conditions, causing even more damage (wet vs. dry, or mar, scratching). Definitely, scratch resistance is a very important paint performance parameter for automotive coatings.
To improve the scratch and mar resistance properties of automotive, refinish and high-end industrial coatings, allnex has developed MODAFLOW® NSR 100, a nanosilica-based anti-scratch additive, compatible with high bake 1K and 2K paints as well as Fast Cure room temperature curing 2K isocyanate paints. MODAFLOW® NSR 100 offers best-in-class scratch and mar resistance at low dosage without affecting appearance, giving fully transparent (no haze) clearcoats, unlike other hard nanoparticle-based additives, which can often negatively affect coating appearance, causing lower gloss, increased haze and reduced levelling. MODAFLOW® NSR 100 is supplied as a 35% solution and has excellent compatibility with a broad range of acrylics and polyesters. |
| Note de contenu : |
- Working principle
- MODAFLOW NSR 100 in 1K automotive OEM clearcoat
- MODAFLOW NSR 100 in 2K automotive OEM clearcoat
- MODAFLOW NSR 100 in fast cure-based 2K vehicle refinish clearcoat
- Fig. 1 : TEM micrograph showing enrichment of MODAFLOW NSR 100 at the coating-air interface
- Fig. 2 : Crockmeter
- Fig. 3 : Carwash tester
- Fig. 4 : Dry scratch resistance results (crockmeter) of 1K clearcoat reference without nanosilica vs. 1K clearcoat with MODAFLOW NSR 100
- Fig. 5 : Carwash resistance results of 1K clearcoat reference without nanosilica vs. 1K clearcoat with MODAFLOW NSR 100
- Fig. 6 : Wavescan results of 1K clearcoat reference without nanosilica vs. 1K clearcoat with MODAFLOW NSR 100 (magenta)
- Fig. 7 : Dry scratch resistance results (crockmeter) of 2K clearcoat reference without nanosilica vs. 2K clearcoat with MODAFLOW® NSR 100
- Fig. 8 : Wavescan results of 2K clearcoat reference without nanosilica vs. 2K clearcoat with MODAFLOW® NSR 100
- Fig. 9 : Dry scratch resistance (crockmeter) of formulations based on SETALUX® 1915 BA-75 (left) and SETALUX FC 1922 BA-75 (right) with and without MODAFLOW' NSR 100
- Fig. 10 : Picture of coated panels after crock test : Clearcoat based on SETALUX FC 1922 BA-75 without nanosilica and same clearcoat with MODAFLOW NSR 100
- Fig. 11 : Isocyanate conversion at room temperature, measured by Infrared Spectroscopy : Formulation based on SETALUX® FC 1922 BA-75 and on
SETALUX® 1915 BA-75 (both without nanosilica)
- Fig. 12 : Spider diagram summarising the advantages and special features of MODAFLOW° NSR 100 (properties improve from inside to outside of the hexagon)
- Table 1 : Performances of 1K clearcoats based on SETALUX® 1760 VB-64, with and without MODAFLOW NSR 100
- Table 2 : Performances of 2K clearcoats based on SETALUX 1767 VV-65, with and without MODAFLOW NSR 100
- Table 3 : Performances of 2K clearcoats based on SETALUX FC 1922 BA-75, with and without |
| En ligne : |
https://drive.google.com/file/d/1bRtUqErwpj4t4NUD-5pLXr9g72T7UeV1/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36001 |
in SURFACE COATINGS INTERNATIONAL > Vol. 104.3 (05-06/2021) . - p. 194-199
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