| Titre : |
Innovative self-initiating UV-curable polyurethane dispersions |
| Type de document : |
texte imprimé |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 44-52 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Bois -- Finition
Bois -- Revêtements
Essai de dureté
Formulation (Génie chimique)
Photoamorceurs (chimie)
Polyuréthanes
Résistance à l'humidité:Résistance à l'eau
Résistance chimique
Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet:Peinture en phase aqueuse -- Séchage sous rayonnement ultraviolet
Revêtements organiques
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Waterborne (WB) UV-curable polyurethane dispersions (PUDs) are the binders of choice in many industrial wood applications. These resins are formulated with photoinitiators that absorb energy and initiate consecutive free radical-curing reactions. Traditional photoinitiators include both Type I (photo cleavage) and Type II (H- abstraction) classes, which are effective for surface curing.1 Because these products are classified as environmentally damaging (toxic to aquatic life) and can be a health hazard (suspected carcinogen), it is essential to fully react these components during curing because of potential migration of unreacted residual amounts. Such concerns are especially important considering the use of these materials for skin- or food-contact applications. New-generation UV-curable PUDs have been developed with initiating sites based on Type II photoinitiators incorporated into the backbone of the polymer. These new self-initiating (SI) polymers have been evaluated for use in industrial wood applications and benchmarked against traditional WB UV PUDs formulated with both conventional and polymeric photoinitiators. The performance of both clear and pigmented coatings has been investigated.
A series of five SI WB UV resins has been developed. These polymers are SI versions of existing WB UV resins. These WB UV resins are all acrylic/polyester polyurethane dispersion hybrids with a minimum film formation temperature (MFFT) of approximately 0 oC. Table 1 summarizes the physical properties and characteristics of the resins evaluated. |
| Note de contenu : |
- INTRODUCTION : Experimental - Clear self-sealing topcoats - Panel preparation
- PROCEDURES AND RESULTS : König pendulum hardness - Boiling water resistance - Chemical/stain resistance - Scrape adhesion - Ball point pen indentation - Green print resistance - Hot print resistance - Edge soak - Plasticizer resistance - Hot and cold check resistance
- Table 1 : Physical properties and characteristics
- Table 2 : Clear self-sealing topcoat
- Table 3 : Coating performances for industrial wood finishes
- Table 4 : SI WB UV 5 reformulated with type 1 photoinitiator
- Table 5 : White self-sealing topcoat formulations
- Fig. 1 : König pendulum hardness (sec)
- Fig. 2 : Boiling water resistance
- Fig. 3 : Chemical resistance using KCMA specifications
- Fig. 4 : Chemical resistance using office furniture specifications
- Fig. 5 : Scrape adhesion in Kg passed
- Fig. 6 : Ball point pen indentation in grams passed
- Fig. 7 : Chemical resistance using KCMA specifications
- Fig. 8 : Chemical resistance using office furniture specifications
- Fig. 9 : Boiling water resistance comparison
- Fig. 10 : Scrape adhesion - Kg passed and ball point pen indentation - grams passed
- Fig. 11 : König pendulum hardness (sec)
- Fig. 12 : Chemical resistance using office furniture specifications
- Fig. 13 : König pendulum hardness (sec)
- Fig. 14 : Chemical resistance using KCMA specification
- Fig. 15 : Chemical resistance using office furniture specifications |
| En ligne : |
https://drive.google.com/file/d/1GgVQoKGEGbyU8o-MghvmFLVAL8qfoKXu/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34343 |
in COATINGS TECH > Vol. 17, N° 7 (07/2020) . - p. 44-52
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Innovative self-initiating UV-curable polyurethane dispersions in COATINGS TECH, Vol. 17, N° 7 (07/2020)
