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COATINGS TECH . Vol. 21, N° 4Powder coating gloss reduction techniquesMention de date : 07-08/2024 Paru le : 15/07/2024 |
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Ajouter le résultat dans votre panierNovel bimodal high-solid polymer dispersions for architectural coatings / Michael Krayer in COATINGS TECH, Vol. 21, N° 4 (07-08/2024)
[article]
Titre : Novel bimodal high-solid polymer dispersions for architectural coatings Type de document : texte imprimé Auteurs : Michael Krayer, Auteur ; Sean W. Bullis, Auteur Année de publication : 2024 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epaississants
Formulation (Génie chimique)
Granulométrie
Haut extrait sec
Revêtements en bâtiment:Peinture en bâtiment
Revêtements en phase aqueuse:Peinture en phase aqueuse
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : Over the past few decades, the performance of water-based architectural paint has consistently improved. However, latex polymer dispersions used in water-based coatings are typically limited to around 50 wt % polymer solids. This is because most polymer dispersions used for architectural coatings have a fairly narrow, single particle-size distribution (monodisperse), and when the monodisperse polymer particles approach their close packing limit, there is a sharp increase in viscosity at solids contents much beyond 50%. On the other hand, polymer dispersions with a bimodal particle-size distribution can achieve a signifi cantly higher solids content due to the increased random close packing limit of polydisperse systems (Figure 1). BASF has extensive experience in developing and producing higher solid polymer dispersions, especially for pressure-sensitive adhesive applications, achieving solids content up to 70%.
Recently, BASF has developed a 60 wt % polymer dispersion with a bimodal particle-size distribution for water-based architectural coating applications. Compared to architectural paints formulated with conventional polymer dispersions, paints formulated with bimodal high-solid dispersions can achieve a higher solids content, resulting in an increased dry fi lm thickness. For instance, in a paint formulation that uses a monodisperse latex binder, increasing the paint solids content beyond 50 wt % (or 40 vol%) causes the formulation to quickly turn into a paste, making it unsuitable as a paint. However, paint formulations that use a bimodal high-solid latex can achieve solids contents of more than 60 wt % (or 50 vol%).Note de contenu : - Brush vs. Roller application
- Practical approach to optimization rheology of architectural paints
- Base paint formulation
- Applying benchmark paints
- Comparing rheology profiles of benchmark paints and commercial paints and determining desired rheology package
- Application study of high-solid paints vs. commercial paints
- Conclusions and lessons learned
- Table 1 : Initial base paint formulation containing latex polymer dispersions with different particle sizes and particle-size distributions
- Table 2 : Latex polymer surface area calculation based on formulas in Table 1
- Table 3 : Base paint formulation with higher paint solids content containing latex polymer dispersions with different particle sizes and particle-size distributions
- Table 4 : Final base paint formulation
- Table 5 : Commercial paint ranking. Ranking from 1–5 (1: Worst, 5: Best)
- Table 6 : Measured leneta flow and leveling (ASTM D4062) and sag resistance of the two most preferred commercial paints, commercial paints A and B, compared with the two less preferred paints, commercial paints K and L
- Table 7 : Weight percentage (wt %) of rheology modifiers in the base paint formulation
- Table 8 : Solids content of BASF paint formulations with latex A vs. commercial paints
- Table 9 : Average application amounts and corresponding coverage rates
- Table 10 : Summary of common verbatims recorded for each paint by a panel of eight participantsEn ligne : https://drive.google.com/file/d/18goTMcxEWKmOG-4uYZB42vZPGQsOcMJ5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41450
in COATINGS TECH > Vol. 21, N° 4 (07-08/2024)[article]Exemplaires
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[article]
Titre : Powder coatings : gloss reduction techniques Type de document : texte imprimé Auteurs : Nathan Biller, Auteur Année de publication : 2024 Article en page(s) : p. 46-49 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) -- Contrôle
Cires
Pigments
Polymères
Revêtement poudre -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : Different aesthetic requirements for powder coatings necessitate formulators to be able to produce finishes in any level of sheen, from full gloss down to dead matte. By default, a basic powder coating formulation will exhibit a 60° specular gloss of 90 or higher. A number of different methods can be employed to reduce the luster to a semigloss or matte finish. Some of these techniques involve the incorporation of mineral fillers or wax additives to impart the desired appearance, while others utilize resin chemistry to create a microscopic texture on the coating’s surface. Note de contenu : - Extender pigments
- Wax additives
- Differential cure
- Incompatible resins
- Table 1 : Types of waxes and their melt points
- Table 2 : Stoichiometric ratios of hydroxylfunctional polyesters with blocked isocyanateEn ligne : https://drive.google.com/file/d/1GPEJECl7uPm47sSrK_GEbF7k8D3dhagS/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41451
in COATINGS TECH > Vol. 21, N° 4 (07-08/2024) . - p. 46-49[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire The impact of microfibrillated cellulose on the rheology of water-based acrylic satin paint upon tinting / Otto Soidinsalo in COATINGS TECH, Vol. 21, N° 4 (07-08/2024)
[article]
Titre : The impact of microfibrillated cellulose on the rheology of water-based acrylic satin paint upon tinting Type de document : texte imprimé Auteurs : Otto Soidinsalo, Auteur ; Harrison C. Gallantree-Smith, Auteur ; Scott Mouw, Auteur Année de publication : 2024 Article en page(s) : p. 50-57 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Epaississants
Formulation (Génie chimique)
Liants en phase aqueuse
Polyacryliques
Polyuréthane éthoxylé modifié de façon hydrophobe
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : Associative thickeners are commonly used to thicken water-based coatings. Their mechanism of action is based on the hydrophobic interaction between the hydrophobic polymer groups as well as with the surface of the binder latex particles. It is commonly known that associative thickener-based formulations are prone to viscosity loss upon tinting due to the surfactants present in the tinting systems, leading to poorer sag resistance.
In this work, the eff ect of an insoluble microfi brillated cellulose (MFC) was studied on the prevention of viscosity loss on tinting with a deep tone base, formulated with two different hydrophobically modified polyurethane associative thickeners (HEURs), combined with a non-associative MFC thickener. The formulations were evaluated in terms of rheology, viscosity, sag resistance, fl ow/leveling, and gloss.
We will demonstrate how MFC can improve the resistance to viscosity loss upon tinting without sacrifi cing the fl ow/leveling properties of the coating.Note de contenu : - Effect of MFC on the rheology of an acrylic binder
- Effect of MFC on the acrylic satin paint formulation
- Table 1 : Acrylic binder formulations
- Table 2 : Variance of the formulations under 3-ITT testing
- Table 3 : Acrylic deep base formulationsEn ligne : https://drive.google.com/file/d/1VdSzCzQdjZhDXcObo6Fo-LsDtp9LujPD/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41452
in COATINGS TECH > Vol. 21, N° 4 (07-08/2024) . - p. 50-57[article]Exemplaires
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