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Overcoming colour performance challenges with novel post-addition colourant solutions / Sebastian Dziki in SURFACE COATINGS INTERNATIONAL, Vol. 105.6 (11-12/2022)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 105.6 (11-12/2022) . - p. 432-433 Titre : Overcoming colour performance challenges with novel post-addition colourant solutions Type de document : texte imprimé Auteurs : Sebastian Dziki, Auteur ; Allison Linn, Auteur Année de publication : 2022 Article en page(s) : p. 432-433 Langues : Anglais (eng) Catégories : Colorants Couleur Revêtements en phase aqueuse -- Additifs Revêtements organiques Index. décimale : 667.2 Colorants et pigments Résumé : Boosting colour strength is on the forefront of coating formulators’ and manufacturers’ minds. However, for many systems, improving colour performance has been a difficult task. Whether it is a ready-made dispersion or a fully formulated system, large adjustments to a formula can be unfeasible due to manufacturing, volatile organic compounds (VOCs) or consumer restraints. Borchers' technology allows for the post-addition of an additive to improve colour acceptance, colour strength or quality of a pigmented system. A simple addition of a colour booster or compatibiliser to the base will result in a stronger, cleaner and more chromatic colour, which can be seen in tints with a variety of difficult pigments. Additional benefits include a reduction or elimination of colour rub-out and improved compatibility of universal waterborne systems used in solventborne bases. Note de contenu : - Challenges with tinting systems - Colour boost additives - Compatibiliser additives : Factors that led to severe incompatibility of zero-VOC colourants with low-VOC alkyd paints - Table 1 : Description and use of the different colour boost additives available - Table 2 : Description and use of the different compatibiliser additives available En ligne : https://www.borchers.com/wp-content/uploads/2023/08/Overcoming-Colour-Performanc [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38674 [article]

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Non-isocyanate coatings with fast return to service and excellent appearance for industrial flooring application in SURFACE COATINGS INTERNATIONAL, Vol. 105.6 (11-12/2022)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 105.6 (11-12/2022) . - p. 448-449 Titre : Non-isocyanate coatings with fast return to service and excellent appearance for industrial flooring application Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 448-449 Langues : Anglais (eng) Catégories : Durée de vie en pot Formulation (Génie chimique) Michael, Addition de L'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées. Cette réaction doit son nom au chimiste américain Arthur Michael. Revêtements de sols industriels Revêtements organiques Revêtements sans isocyanates Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Floor coatings are of great importance in the industrial, commercial, and architectural markets because they provide protection to the substrate and aesthetics to the environment. Concrete floors are the preferred substrate due to hardness, durability, relative low cost, and ease of installation. However, concrete floors lack chemical resistance and flexibility to achieve different degrees of finish (high gloss, colors, special effects, etc.). A wide range of polymer technologies are used as protective coatings ranging from acrylic emulsions or thermoplastic acrylics to high-performance two-component (2K) systems such as epoxies, polyaspartics, and polyurethanes (PUs). The application properties of these coatings have a very big impact on the total installed cost. In this cost, end-users will also consider the opportunity cost of downtime. Therefore, systems that enable fast return to service are preferree, which generally requires a thermoplastic material or high reactivity. Technologies like MMA and poly-aspartic exhibit high reactivity, which in turn requires a high proficiency of the applicators. During the application of floor coatings on large sections, such as warehouses or airplane hangars, a long open time is needed to avoid lapping marks. Such marks result when the coating applied on the first section starts curing so fast that the adjacent second section (generally overlapping 2.5-7.5 cm) does not blend-in with the first layer. Another problem arises from the reaction of the chemicals as soon as they are mixed, which limits the time by which these can be applied (termed the pot-life). PA MMA, 2K PU tipically increase in viscosity or form a gel, while epoxy systems tend to lose gloss. With epoxies this can results in a gradient appearance from one end to another end of the coated surface. End of pot-life typically requires the coating to be disposed of as there is no way to reverse the reaction. A novel technology called ACURE has proven the possibility of using Michael addition (MA) chemistry by using a blocked catalyst. ACURE relies on the formation of carobn-carbon bonds when an acidic proton is abstracted from a malonate groupe by a strong base. The resulting carbanion reacts with the partially positive carbon in the π bond of an acrylate group. The catalyst is designed to de-block via evaporation, generating ethanol and carbon dioxide after the coating has been applied, and allowing the de-blocked strong base to initiate the fast polymerisation reaction. Nevertheless, if the activated coating remains in a closed container, the system reaches equilibrium and the deblocking of the catalyst is inhibited, thus the activated coating will remain in the liquid state for an extended period. Note de contenu : - Fig. 1 : Michael addition chemistry applied in polymers - Fig. 2 : Lapping time evaluated at 20 minutes (60 % R.H. and 23°C) - Fig. 3 : Technology comparison En ligne : https://www.paint.org/wp-content/uploads/2022/02/Non-Isocyanate-Coatings-Industr [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38675 [article]

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Mechanism of defoamers in aqueous systems in SURFACE COATINGS INTERNATIONAL, Vol. 105.6 (11-12/2022)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 105.6 (11-12/2022) . - p. 452-453 Titre : Mechanism of defoamers in aqueous systems Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 452-453 Langues : Anglais (eng) Catégories : Antimousse Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Excessive foam formation is one of the problems that one can face during the formulation of waterborne paint systems. Foam formation should be avoided by all means possible. During the production and filling stages, foam leads to inefficiency, overflow in tanks, instability and other problems. Foam formation during paint application can lead to properties like crater forming, loss of opacity and protection. In order to fight foam formation, defoamers or anti-foaming agents are used. Almost every waterborne paint system will contain an anti-foaming, agent typically in the 0.0-0.5 % concentration range by weight, but the selection of an appropriate anti-foaming agent is a challenge. The efficiency of anti-foaming agents depends on the specific paint system and the process utilised. Note de contenu : - Defoaming - Mechanism of defoaming : One or more hydrophobic components - Mineral oil - Surface active dispersing agents/emulsifiers - Potential side effects - Printiples of selection - DAPRO defoamers En ligne : https://drive.google.com/file/d/1TlBNdA0oEO65d6-85fHv3pxPsX1PDYwR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38676 [article]

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The trouble with paint microplastics / Richard Kennedy in SURFACE COATINGS INTERNATIONAL, Vol. 105.6 (11-12/2022)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 105.6 (11-12/2022) . - p. 465-467 Titre : The trouble with paint microplastics Type de document : texte imprimé Auteurs : Richard Kennedy, Auteur Année de publication : 2022 Article en page(s) : p. 465-467 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eau -- Pollution Microplastiques Milieu marin -- Pollution Revêtements (produits chimiques):Peinture (produits chimiques) Revêtements -- Aspect de l'environnement:Peinture -- Aspect de l'environnement Index. décimale : 667.6 Peintures Résumé : Over the last twenty years or so, the world has belatedly become more onscious of, and more concerned about, the plastic pollution found in the environment. We have all seen landscapes filled with plastic debris, distressing pictures of mammals and birds trapped in plastic waste, or heard reports of plastic waste found inside creatures, having caused their death. It is no surprise that surveys of aquatic and terrestrial ecosystems have found not only large plastic items, but also microplastic particles, and these may be just as dangerous to organisms as the larger pieces. Microplastics, however you wish to define them by size, can be ingested by a wide range of creatures ranging from the smallest invertebrates (microinvertebrates in soit, such as nematodes, rotifers and water bears, less than 0.1 mm in size) to large mammals. There will be no plastic particles so small that will not likely endanger or affect some size of organism. Even the smallest plastic particles can potentially affect large mammals (including humans) as a result of the food chain and the build-up of larger concentrations of plastic particles. But the problem is potentially worse than just the polynner particles : many plastics contain additives that can leach out and affect organisms in, at present, largely unknown ways. There is a readable explanation of'how soit invertebrates deal with microplastic contamination'', which gives a balanced account of our current understanding of the effects of microplastics on soit organisms. There is evidence that microplastics cause several health problems for earthworms and springtails, leading to slower growth, less offspring and early death after ingestion, but there is also some evidence that suggests bacteria in the guts of certain organisms may speed up the degradation of microplastics in soit. However, the overall impression given in this article and throughout most of the literature on the quantity and effects of microplastics in the environment is that there is not very much known. Note de contenu : - Survey and review - The environmental action study and responses - Consequences En ligne : https://drive.google.com/file/d/1dp7Nm-mkprkaphcuw3HFuCV9YObQSobt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38677 [article]

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A back-of-an-envelope estimate of paint microplastics in the marine environment - a view from the industry / Peter Collins in SURFACE COATINGS INTERNATIONAL, Vol. 105.6 (11-12/2022)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 105.6 (11-12/2022) . - p. 468-472 Titre : A back-of-an-envelope estimate of paint microplastics in the marine environment - a view from the industry Type de document : texte imprimé Auteurs : Peter Collins, Auteur Année de publication : 2022 Article en page(s) : p. 468-472 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Microplastiques Milieu marin -- Pollution Revêtements (produits chimiques):Peinture (produits chimiques) Revêtements -- Aspect de l'environnement:Peinture -- Aspect de l'environnement Index. décimale : 667.6 Peintures Résumé : Recent television documentaries have highlighted to the general public', in countries ail round the world, the problem of plastic pollution in the oceans. Logically, this plastic pollution can only result from two sources: the transport and breakdown of macro-polymers (by mechanical wear, photochemical and hydrolytic degradation), or from the transport of micro and nano-polymers. There have been several attempts now to estimate the scale of contributions from paints and coatings to microplastic pollution in the environment (land and water), ranging from 9.6% to 21%.The most recent addition to the literature, however, is a modelling study from Environmental Action' (EA) claiming that paint contributes to 58% of microplastic leakage to the environment.The range of these estimates indicates how difficult it is to make a quantitative assessment. Furthermore, to understand the scale and importance of plastic as a source of marine pollution, it needs to be viewed in comparison to other sources, such as tyres, textiles or plastic packaging, most of which remain to be comprehensively assessed. Note de contenu : - Architectural paints - Marine vessel paints - Other possibly significant paint environmental pollution sources : Road marking paints - Mitigation : Architectural paints - road-marking paints - Marine paints - Table 1 : Global paint market sales 2019 - Table 2 : Architectural waterborne paint : Estimates of polymer waste from cleaning of brushes and rollers - Table 3 : Architectural exterior : Estimates of polymer waste lost from dry films - Table 4 : Road-marking paint : estimates of polymer waste from erosion - Table 5 : Marine anti-fouling topcoat : abrasion losses - Table 6 : Marine superstructure and deck coatings En ligne : https://drive.google.com/file/d/1TKs_YgQyaQv4gzniIAJ9h9bldMMK9zOE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38678 [article]

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Surface Coatings International Vol. 105.6 URL