Developing colour to its full potential / Loulou Rozek in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 207, N° 4633 (08/2017)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 207, N° 4633 (08/2017) . - p. 22-26 Titre : Developing colour to its full potential : The author discusses novel dispersants for optimum pigment dispersions Type de document : texte imprimé Auteurs : Loulou Rozek, Auteur Année de publication : 2017 Article en page(s) : p. 22-26 Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Pigments Index. décimale : 667.2 Colorants et pigments Résumé : The automotive and performance coatings industries have seen a significant shift from solvant to waterborne systems in recent years. This change has brought challenges to paint formulators. One of those challenges is producing colours ta match those of solvent systems in vibrancy and undertones, particularly with low surface functionality pigments such as perylene, phthalocyanine blues and high jet carbon black pigments. To overcome those challenges, novel dispersants with unique structure and chemistry have been developed to produce better colour performance and jetness than ever before in waterborne coatings. Understanding the relations between the dispersant's chemistry, structure and affinity to organic pigment surface will help the formulator net only optimise colour performance but also understand and control other parameters that are key to production efficiency, such as grind lime (energy) and grind viscosity (pigment loading). Note de contenu : - Structure of dispersants - Case study : PR 179 - Viscosity and viscosity stability - Case study : PBK7 - FIGURES : 1. Typical structures of polymeric dispersants - 2. Interaction of dispersant's polar groups with pigment surface polar sites - 3. Pigments with low surface functionalities - 4. Novel dispersants unique structure - 5. The electron rich body of novel dispersants creates a strong interaction with pigment surface - 6. Particle size of novel dispersant against benchmark - 7. Hunter L*a*b* values novel dispersant and benchmark - 8. PR 179 colour development over time with Disp. 1 and Disp. 2 - 9. Disp. 2 has higher gloss : at 0.5hr than Disp. 1 at four hr - 10. Viscosity initial and one month at RT - 11. Mean particle size over time and jetness over time - 12. 20° gloss and haze - 13. Three step viscosity (cPs) - TABLES : 1. Concentrate formulation, benchmark (Disp. 1) and novel dispersant (Disp. 2) - 2. Let-down in WB 2K PU systems - 3. Concentrate formulation, benchmark (Disp. 1) and novel dispersant (Disp. 2) - 4. Let-down in WB 2K PU system - 5. Jetness values for four PBK 7 En ligne : https://drive.google.com/file/d/1dh8chW48B9h7kwmffxg8a3-Lr5oMstJT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28849 [article]

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How to achieve faster dry times and more with high-performance catalysts in low-VOC alkyd coatings / Allison Abbey in COATINGS TECH, Vol. 19, N° 1 (01/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 1 (01/2022) . - p. 34-43 Titre : How to achieve faster dry times and more with high-performance catalysts in low-VOC alkyd coatings Type de document : texte imprimé Auteurs : Allison Abbey, Auteur ; Loulou Rozek, Auteur ; Maxwell Shumba, Auteur Année de publication : 2022 Article en page(s) : p. 34-43 Langues : Américain (ame) Catégories : Adhésion Catalyseurs Dureté (matériaux) Formulation (Génie chimique) Jaunissement (défaut) Polyalkydes Résistance à l'humidité:Résistance à l'eau Revêtement -- Séchage Revêtement en phase solvant Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The alkyd coating market continues to face increasing challenges as government bodies and environmental agencies establish new volatile organic content (VOC) and regulatory restrictions. In many cases, reformulation is necessary to meet ow-VOC requirements, which may cause adverse effects in the final coating, such as slow dry times, increasingly complex formulations, and poor coating performance. Formulators can overcome such performance obstacles in sustainable coatings by using the proper high-performance catalyst (HPC). This unique technology can meet VOC requirements, outperform standard metal carboxylates across multiple resin platforms, and may eliminate the need for complex drier packages. Note de contenu : - EXPERIMENTAL PRACTICES - HOW TO FORMULATE WITH HPCS : Sample preparation - Dry-time evaluations - Hardness - Yellowing - Loss of dry (LOD) - Skinning - Adhesion - Water resistance - RESULTS AND DISCUSSION : High-solids solventborne alkyd case study - Water-reducible alkyd case study - Waterborne alkyd case study En ligne : https://drive.google.com/file/d/1995MAOGS83aC3OuULSvhKoZLSqvp67uX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37170 [article]

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