[article]
Titre : |
New urethane diol resin modifiers for improved performance of aminoplast crosslinked coatings |
Type de document : |
texte imprimé |
Auteurs : |
Matthew Gadman, Auteur ; John Florio, Auteur ; Ravi Ravichandran, Auteur ; Steven Woltornist, Auteur |
Année de publication : |
2019 |
Article en page(s) : |
p. 34-46 |
Note générale : |
Bibliogr. |
Langues : |
Américain (ame) |
Catégories : |
Aminoplastes Anticorrosion Diols Formulation (Génie chimique) Hexaméthoxy méthyl mélamine MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Polyesters Polyuréthanes Résistance à l'humidité Résistance au vieillissement Résistance aux brouillard salin Revêtements en phase aqueuse -- Additifs Solubilité Urethanes
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Index. décimale : |
667.9 Revêtements et enduits |
Résumé : |
New water-soluble urethane diol resins have been developed to be used as resin modifiers for waterborne coatings systems crosslinked with amino resins. These urethane diols are a multipurpose chemical species that can be utilized to enhance performance properties as well as resolve some of the common issues experienced when formulating waterborne systems.
The above-mentioned resin modifiers are water soluble without the presence of amine neutralizers, surfactants, or co-solvents. Incorporating these urethane diols will thus improve the water solubility of a resin system in a wet paint, subsequently reducing the need for neutralizing amines and additionally allowing for easier resin incorporation with less co-solvent requirements. As resin modifiers, the urethane backbone allows formulators to enhance performance of aminoplast crosslinked coatings by incorporating urethane groups into a crosslinked network without the use of an isocyanate.
This work demonstrates the versatility of these urethane diols and further discusses how they can be used to enhance coating performance by improving corrosion and humidity resistance, as well as increasing hardness while maintaining flexibility. |
Note de contenu : |
- INTRODUCTION : Waterborne polyester formulations crosslinked with amino resins - Formulating with melamine crosslinkers - Necessity and effects of amine in PE/HMMM coatings - Polyurethane coatings - Urethane linkages in melamine coatings - Pursuit of non-VOC coatings : the rise of aqueous formulations and their limitations - Urethane diols for modifying aqueous formulations crosslinked with amino resins
- EXPERIMENTAL : Experiment I : crosslinking capabilities of urethane diols with amino resins - Experiment II : reactivity of 1° vs 2° hydroxyl functional urethane diol - Cure response - Thermal gravimetric analysis - Experiment III : acid etch resistance of diol D modified white pigmented polyester coating - Experiment IV : diol a modifications of WB PE crosslinked with HMMM - Amine required for neutralization - Solids, water, and VOC content - Film properties - Moisture resistance - Salt fog resistance - Age stability
- Table 1 : Physical properties of urethane diols
- Table 2 : Physical properties of saturated polyesters
- Table 3 : White pigmented water thinnable PE grind
- Table 4a : Formulation components of white pigmented water-thinnable PE
- Table 4b : Characteristics of white pigmented PE formulation
- Table 5 : Acid Etch resistance of diol D modified white PE formulations
- Table 6a : Formulation 1 : Clear water-reducible PE-HMMM
- Table 6b : Characteristics of formulation 1
- Table 7a : Formulation II : Clear water-diluable PE-HMMM
- Table 7b : Characteristics of formulation II
- Table 8a : Formulation II : White (Tio2) water-thinnable PE-HMMM
- Table 8b : Characteristics of formulation III
- Table 9 : Appearance of formulation 1 at start of titration
- Table 10 : DMEA content of formulations I and II
- Table 11 : Test specifications for film property tests
- Table 12 : Appearance recovery after 215 h of humidity exposure
- Table 13 : Film appearance after 1500 h of humidity exposure
- Table 14 : Film appearance after salt fog exposure
- Table 15 : Film appearance after salt fog exposure
- Table 16 : Formulation 1 pot appearance upon aging - RT, 50°C and 60°C |
En ligne : |
https://drive.google.com/file/d/1vkvHYKZ7oV59ZkEupyjg8q1fUyST1R1x/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31853 |
in COATINGS TECH > Vol. 16, N° 2 (02/2019) . - p. 34-46
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