Des revêtements conformes aux réglementations / Richard Kennedy in EUROPEAN COATINGS JOURNAL (ECJ), N° 10/94 (10/1994)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10/94 (10/1994) . - p. 670-689 Titre : Des revêtements conformes aux réglementations : le pour et le contre Type de document : texte imprimé Auteurs : Richard Kennedy, Auteur Année de publication : 1994 Article en page(s) : p. 670-689 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture  poudre'  eau'  haute  teneur  solide'  Séchage  Durcissement  'Rayonnement  UV'  'Irradiation  électron'  'Prévention  pollution' Index. décimale : 667.9 Revêtements et enduits Résumé : La législation a entraîné l'industrie des peintures à développer et à améliorer des revêtements respectueux de l'environnement. En plus de la substitution et du remplacement des solvants organiques du revêtement, les développements ont eu pour objectif de remplacer le plomb, le chrome et d'autres métaux lourds des revêtements chaque fois que possible. On a également développé des revêtements sans isocyanates. On tient compte de l'élimination des déchets: les revêtements ou les équipements sont développés afin de permettre le recyclage et la réutilisation. Note de contenu : - Revêtements par poudres - Les peintures à base aqueuse - Les "hauts extraits secs" - Séchage par irradiation - Le futur Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11253 [article]

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The prospects for antiviral coatings / Peter Collins in SURFACE COATINGS INTERNATIONAL, Vol. 103.3 (05-06/2020)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 103.3 (05-06/2020) . - p. 122-127 Titre : The prospects for antiviral coatings Type de document : texte imprimé Auteurs : Peter Collins, Auteur ; Richard Kennedy, Auteur Année de publication : 2020 Article en page(s) : p. 122-127 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens Argent Cuivre Dioxyde de titane Nanoparticules Nanotubes Oxyde de graphène Photocatalyse Revêtements antiviraux Revêtements hygiéniques Index. décimale : 667.9 Revêtements et enduits Résumé : The current COVID-19 pandemic has had a dramatic effect on societies worldwide. Within a matter of weeks, normal day-to-day life changed to something more akin to a horror film as many nations introduced draconian measures in order to reduce the spread of the virus and prevent the numbers of patients requiring hospital treatment overwhelming their intensive care facilities. In light of the perceived high infectivity of the virus, members of the Royal Society of Chemistry's Surface Coatings Special Interest Group, in collaboration with the British Coatings Federation, organised a virtual gathering of more than 130 academics, industry specialists and representatives of healthcare and transport organisations to share knowledge about antiviral coatings and express views on what needs to be done to accelerate research output in this field. One of the aims of the meeting was to review hygienic coatings technology' and its prospects for fighting viruses. Note de contenu : - Use of surfactants - Copper and silver - Photocatalytic titanium dioxide nanoparticles - Coatings that regenerte an active agent - Graphene oxide and carbon nanotubes - The challenges En ligne : https://drive.google.com/file/d/13Xmw0syAVpYxNzLo85a-CPjw9OLoqTSo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34339 [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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UV curing for the uninitiated / Richard Kennedy in SURFACE COATINGS INTERNATIONAL, Vol. 104.4 (07-08/2021)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 104.4 (07-08/2021) . - p. 294-296 Titre : UV curing for the uninitiated Type de document : texte imprimé Auteurs : Richard Kennedy, Auteur Année de publication : 2021 Article en page(s) : p. 294-296 Langues : Anglais (eng) Catégories : Benzophénones Photoamorceurs (chimie) Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : In coating technology, many desirable properties result from the chemical crosslinking (or curing) of coating polymers, after the wet coating has been applied to a product. There are a number of general curing methods available to coatings technologists to turn a liquid coating formulation into a solid film. In industrial finishing, for example, coatings may be passed through a heated oven in order to force them to cure at an appropriate rate for the manufacturing process (typically 10-20 minutes). Radiation curing provides an essentially zero-VOC, energy-efficient alternative to conventional curing methodologies. In contrast with thermally induced polymerisation, radiation curing can be extremely fast, but it is largely only suitable for flat substrates that can move beneath the lamp system or for applications requiring spot curing. Radiation curing essentially involves a polymerisation process initiated by the absorption of energy in the form of light or other radiation, and by far the most common form of radiation curing is UV curing, which uses the energy from ultraviolet (UV) radiation, and allows the liquid coating to be handled in normal lighting conditions. The ultraviolet region of the electromagnetic spectrum encompasses radiation with wavelengths from about 100 nm to about 400 nm, where we start moving into the visible light region. For UV curing purposes, the most commonly used lamp system is the mercury arc lamp (or comparable electrodeless lamp), but UV LEDs (which are more energy efficient and have less health & safety-related issues than mercury lamps) are increasingly used. Once excited, mercury emits UV radiation, with particularly strong emission lines at 254 nm, 313 nm, 366 nm, and towards the blue part of the visible spectrum, 404 nm and 436 nm. UV LED light systems have predominantly monochromatic (single wavelength) emissions, which can be at 365 nm, 385 nm, 395 nm or 405 nm, depending on the LED system. I suspect most of us have (sadly) been exposed to radiation curing in the dental surgery, where a blue light was used to initiate the polymerisation (or hardening) of a dental filling. UV curing a coating, however, is not as simple as just shining UV light at it ! The chemistry of the coating formulation needs to be coordinated with the light source. This short article aims to give a brief introduction to UV curing and some of the interesting and unique issues arising from the technology. Note de contenu : - The chemistry of a UV formulation - Curing UV coatings in air - The effect of pigmentation on UV curing - Gloss coatings - Overview - Fig. 1 : Wavelength availability of UV LED lamps vs. mercury lamps - Fig. 2 : Type I photoinitiator : Lifetime of the excited state is relatively short and the energy absorbed is less likely to be lost due to molecular collisions - Fig. 3 : Benzophenone is a typical Type II photoinitiator. The excited triplet state is a relatively long-lived species and more likely to lose energy via molecular collisions En ligne : https://drive.google.com/file/d/1VFQLTQYhY1lY8-w0UXGvSSuJOd2yN7hl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36114 [article]

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