Enabling safer, effective crosslinking with breakthrough resin innovations / Craig Frankum in SURFACE COATINGS INTERNATIONAL, Vol. 107.4 (07-08/2024)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 107.4 (07-08/2024) . - p. 293-295 Titre : Enabling safer, effective crosslinking with breakthrough resin innovations Type de document : texte imprimé Auteurs : Craig Frankum, Auteur ; Ad Overbeek, Auteur ; Fred Bückmann, Auteur Année de publication : 2024 Article en page(s) : p. 293-295 Langues : Anglais (eng) Catégories : Polyéthylèneimine Réticulants Revêtements (produits chimiques):Peinture (produits chimiques) Index. décimale : 667.9 Revêtements et enduits Résumé : With consumers and painters increasingly conscious of the safety profiles of decorative coatings, manufacturers around the world are working to further deliver solutions. Covestro supports them with this task through its cutting-edge R&D, innovation support and broad toolbox of advanced resin technologies. Just one example is its polymeric aziridine crosslinker that offers lowered toxicity levels while still delivering equal performance to traditional aziridine crosslinkers. With recent studies suggesting that 25% of all indoor air pollution now comes from paint, efforts to improve the safety profile and health impact of our decorative paints and coatings are more important now than ever. In recognition of this issue, and as a player early in the coatings’ value chain, Covestro continually works to create safer paint ingredients that can keep manufacturers, applicators and consumers safe. As part of these efforts, for instance, we have worked to lower levels of volatile organic compounds (VOCs) and biocides in our resins, eliminate triethylamine and reduce the use of other tertiary amines that can contribute to strong odours, phase out N-methylpyrrolidone (NMP), and improve the film formation of our systems to reduce the need for co-solvents. We also have a dedicated innovation platform related to detox and compliance, enabling us to further phase out chemicals of concern. In this way, we ensure that our customers can develop safer coatings that future-proof their portfolios against impending legislation changes. Note de contenu : - The functional Performance challenge - NeoAdd PAX : an innovative crosslinking - Excellent secondary functional properties - All the performance, half the labelling En ligne : https://drive.google.com/file/d/11rsPr3JQOwMcRI-ItrjG4-1Y9mUwgR5f/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41388 [article]

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Fast drying high solids latices / Fred Bückmann in EUROPEAN COATINGS JOURNAL (ECJ), N° 12/95 (12/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 12/95 (12/1995) . - p. 922-929 Titre : Fast drying high solids latices Type de document : texte imprimé Auteurs : Fred Bückmann, Auteur ; Folkert Bakker, Auteur Année de publication : 1995 Article en page(s) : p. 922-929 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acrylate de butyle Haut extrait sec Humidité -- Absorption Latex Liants Mélanges (chimie) Méthacrylate de méthyle Revêtement -- Séchage:Peinture -- Séchage Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Taille des particules Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : This paper describes a study of several model bimodal particle size distribution latex systems produced by blending large and small particle size anionically stabilised latices over a wide range of blend ratios. Minimum film forming temperature (MFT), drying rate and water uptake measurements were carried out. At a 80/20 weight ratio large/small particles, a minimum was observed in the MFT and also in the extent of water absorption of latex films with short drying times, although for films dried for longer periods, no such minimum in water absorption was observed. Drying profiles fit well with existing models, except for the 80/20 I/s blend which exhibits more complex drying behaviour. Low shear rate viscosity of selected blends was measured over a range of latex solids contents. The rheological data was fitted by the Krieger-Dougherty equation which was used to calculate the maximum volume packing fraction. An 80/20 blend (large/small) was found to exhibit a higher maximum volume fraction than that of either pure component of the blend, demonstrating the better packing achievable by blending. Finally several different application areas will be discussed. Note de contenu : - Selection of application areas for bimodal dispersions Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11377 [article]

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Self-crosslinking surfactant free acrylic dispersions / Fred Bückmann in EUROPEAN COATINGS JOURNAL (ECJ), N° 6/01 (06/2001)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 6/01 (06/2001) . - p. 53-60 Titre : Self-crosslinking surfactant free acrylic dispersions Type de document : texte imprimé Auteurs : Fred Bückmann, Auteur ; Ad Overbeek, Auteur ; Tijs Nabuurs, Auteur Année de publication : 2001 Article en page(s) : p. 53-60 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Surfactant free acrylic dispersions with a core-shell particle morphology are described, where the shell polymer is a self-crosslinking polymeric dispersant used for the stabilisation of the polymer particle. The phase ratio's and the magnitude in which the Tq's of the polymeric dispersant and the subsequently formed polymer differ were found to be of crucial importance to obtain a very low MFT and hence very good film formation combined with very high hardness and good anti blocking properties. In addition films cast from these dispersions have excellent chemical resistances which make these dispersions very useful as binders for high performance coating systems. Note de contenu : - Polymer entanglement is crucial for film formation - Hydrophilic low molecular weight polymer backbones - Sequential polymerisation for phase separated particle morphologies - Crosslinking for improved chemical resistance - The role of the surfactant - Concept of surfactant free dispersions with self dispersing polymers - Polymeric self-crosslinking surfactant - Properties of polymeric self-crosslinking surfactant - The effect on film formation - Investigating model dispersions - Application in high performance coatings En ligne : https://drive.google.com/file/d/1WE47U7biHXhhSqMNLtu5nlFDSZNj63yi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10954 [article]

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Self-crosslinking surfactant free acrylic dispersions / Fred Bückmann in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/01 (07-08/2001)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/01 (07-08/2001) . - p. 53-60 Titre : Self-crosslinking surfactant free acrylic dispersions Type de document : texte imprimé Auteurs : Fred Bückmann, Auteur ; Ad Overbeek, Auteur ; Tijs Nabuurs, Auteur Année de publication : 2001 Article en page(s) : p. 53-60 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Surfactant free acrylic dispersions with with a core-shell particle morphology are described, where the shell polymer is a self-crosslinking polymeric dispersant used for the stabilisation of the polymer particle. The phase ratio's and the magnitude in which the Tg's of the polymeric dispersant and the subsequently formed polymer differ were found to be of crucial importance to obtain a very low MFT and hence very good film formation combined with very high hardness and good anti blocking properties. In addition films cas from these dispersions have excellent chemical resistances which make these dispersions very useful as binders for high performance coating systems. Note de contenu : - POLYMER ENTANGLEMENT IS CRUCIAL FOR FILM FORMATION - HYDROPHILIC LOW MOLECULAR WEIGHT POLYMER BACKBONES : Water acts as plasticizing agent - Additional crosslinking to overcome poor water resistance - SEQUENTIAL POLYMERISATION FOR PHASE SEPARATED PARTICLE MORPHOLOGIES : Low Tg for film formation plus high Tg for durability - Core/shell emulsions usually require surfactant - CROSSLINKING FOR IMPROVED CHEMICAL RESISTANCE : Reaction between polymer chains or emulsion particles - A variety of crosslinking mechanisms - THE ROLE OF THE SURFACTANT : Migration is a problem - Copolymerisable surfactants - reactivity is difficult to adjust - Polymeric surfactants with reduced mobility - Stabilisation by anionic initiators - only for low solids - CONCEPT OF SURFACTANT FREE DISPERSIONS WITH SELF DISPERSING POLYMERS : Creation of core/shell particles through secondary dispersion - More rapid buildup of toughness and resistance - POLYMERIC SELF-CROSSLINKING SURFACTANT - PROPERTIES OF POLYMERIC SELF CROSSLINKING SURFACTANT : Surface tension is reduced effectively - Stable dispersion with low particle size - Core/shell geometry verified - THE EFFECT ON FILM FORMATION : Crosslinks at the particle surface are mos effective - Crosslinking both core and shell polymers - Surfactant does not exude - INVESTIGATING MODEL DISPERSIONS : Tg affects surface hardness - Acid value influences MFT but not hardness - Very good blocking properties with low Tg material - APPLICATION IN HIGH PERFORMANCE COATINGS : Translucent industrial wood coatings with excellent wetting - Flexible and anti-blocking coatings for joinery Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33499 [article]

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