[article]
| Titre : |
Fine-tuning coating surface control through the use of modified siloxanes |
| Type de document : |
texte imprimé |
| Auteurs : |
Ingrid K. Meier, Auteur ; Fadia Namous, Auteur ; K. Michael Peck, Auteur ; Roger Reinartz, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 58-66 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Bois -- Revêtements protecteurs
Jaune
Pigments
Polyacryliques
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.
Polymères ramifiés
Polyuréthanes
Résistance à l'abrasion
Revêtements en phase aqueuse -- Additifs
Vernis en phase aqueuse -- Additifs
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Siloxane-based additives are critical tools in coating applications because their structures can be varied to provide a broad range of performance benefits in many types of formulations and chemistries. Surfactants and defoamers are some of the more commonly recognized additive classes, but many other functionalities can be derived from siloxane chemistries, particularly attributes related to surface control such as flow and leveling, slip, scratch resistance, and haptic properties. This extensive range of performance attributes is achievable due to the broad flexibility inherent in siloxane chemistry, allowing a fine-tuned balance of compatibility, incompatibility, and surface activity.
As with many additive types, a broad range of functionalities creates many options for improvement and innovation but also presents challenges in finding the right additive and optimizing to achieve the desired performance. This article will attempt to clarify the general structure-property relationships that drive the performance attributes of siloxane additives and detail the continuum that exists between wetting, leveling, defoaming, and slip within this chemistry class. Surface control properties and testing will be reviewed and related to recent evaluation work conducted in developing novel siloxane surface control additives. |
| Note de contenu : |
- INTRODUCTION : Siloxane chemistry - Siloxane-based Surface control additives in coating applications - The need for recoatability : The balancing act
- RESULTS AND DISCUSSION : Experimental - Design of the new surface control additives - Evaluations of new surface control additives in waterborne wood coatings
- Fig. 1 : Representation of the chemical structure of polydimethylsiloxane
- Fig. 2 : Typical chemical structure of a comb siloxane
- Fig. 3 : Typical chemical structure of an a,w-siloxane
- Fig. 4 : Structures of organo-modified polymediméthylsiloxane surface control additives
- Fig. 5 : Micrograph of a polyurethane dispersion containing 1.0 wt% of an emulsion of a crosslinked siloxane (MAG 1000 x HV : 15.OkV D : 7.7 mm)
- Fig. 6 : Visual appearance ratings
- Fig. 7 : Scratch resistance testing and ratings
- Fig. 8 : Comparison of the effects of surface control additives on the blocking properties of a pigmented waterborne acrylic wood coating
- Fig. 9 : Comparison of cross-cut areas of panels that have been coated twice with pigmented waterborne acrylic wood coatings containing 0.5 wt% surface control additives
- Table 1 : Waterborne self-crosslinking modified acrylic clear wood coating
- Table 2 : Waterborne self-crosslinking acrylic clear wood coating
- Table 3 : Pigment yellow 42 (PY 42) concentrate
- Table 4 : Pigmented water-based acrylic wood coating
- Table 5 : Characteristics of siloxane based surface control additives
- Table 6 : Performance of surface control additives when post-added to a commercial water-based oil-modified polyurethane clear semi-gloss wood coating applied on Leneta Charts
- Table 7 : Performance of surface control additives when post-added to a water-based self-crosslinking modified |
| En ligne : |
https://drive.google.com/file/d/1KB37PGXF00a1AKdeY-Ku1tj2XbEAolux/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33907 |
in COATINGS TECH > Vol. 17, N° 3 (03/2020) . - p. 58-66
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Fine-tuning coating surface control through the use of modified siloxanes in COATINGS TECH, Vol. 17, N° 3 (03/2020)
