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SURFACE COATINGS INTERNATIONAL . Vol. 104.4Mention de date : 07-08/2021Paru le : 30/08/2021 |
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Ajouter le résultat dans votre panierA guide for MEKO compliance arid 'future- proofing' alkyds / Allison Musto in SURFACE COATINGS INTERNATIONAL, Vol. 104.4 (07-08/2021)
[article]
Titre : A guide for MEKO compliance arid 'future- proofing' alkyds Type de document : texte imprimé Auteurs : Allison Musto, Auteur Année de publication : 2021 Article en page(s) : p. 278-279 Langues : Anglais (eng) Catégories : Agents anti-peau
Cobalt
Méthyléthylcétone oximeLa méthyléthylcétone oxime est le composé organique de formule C 2 H 5 C(NOH)CH 3 . Ce liquide incolore est le dérivé oxime de la méthyléthylcétone . MEKO, comme on l'appelle dans l'industrie de la peinture, est utilisé pour supprimer le "pelling" des peintures : la formation d'une peau sur la peinture avant son utilisation. Il est particulièrement utilisé dans les peintures alkydes . MEKO fonctionne en liant les agents siccatifs , les sels métalliques qui catalysent la réticulation oxydante des huiles siccatives. Une fois la peinture appliquée sur une surface, MEKO s'évapore, permettant ainsi au processus de séchage de se poursuivre. D'autres agents anti-peau ont été utilisés, notamment des antioxydants à base de phénol , mais ceux-ci ont tendance à jaunir la peinture. Le butanone oxime est également utilisé dans certains types de silicones RTV.
Polyalkydes
Produits chimiques -- Suppression ou remplacement
Revêtements (produits chimiques):Peinture (produits chimiques)
Revêtements:PeintureIndex. décimale : 667.6 Peintures Résumé : Alkyd-based paints are experiencing a revival in the coatings industry due to their bio-renewability, cost-effectiveness and overall good performance in many applications. As the industry increases sustainability standards for paint formulations, a hurdle for alkyd coatings remains in the raw materials required to formulate a paint, namely cobalt catalysts and methyl ethyl ketoxime (MEKO) anti-skinning agents.
These two materials face increasing regulatory changes, which will simultaneously increase the burden on formulators developing label-free paint. MEKO's toxicity makes it challenging for formulators to meet safe exposure limits due to its volatility and additionally, MEKO and cobalt have been classified as carcinogens. In this paper, we discuss non-toxic alternatives to both materials, focusing on the path to reformulation with data demonstrating the performance benefits of Borchers'cobalt and MEKO alternatives.
Background on alkyd coatings : Alkyd-based coatings dry via autoxidation when oxygen reacts with points of unsaturation based on fatty acids in the resin.This process can be prolonged if unaided, so cobalt-based catalysts are utilised as oxidative catalysts to speed the curing of alkyd resins. Since cobalt catalysts are reactive to oxygen, an anti-skinning agent such as MEKO is often required to prevent the paint surface from forming a film (called 'skin').Therefore, many alkyd-based paint formulations are dependent on cobalt for adequate curing and on MEKO for storage stability.Note de contenu : - The regulatory case on cobalt & MEKO
- Evaluation paths for MEKO replacement
- Borchers' high-performance catalysts and MEKO-free anti-skinning agents
- Highlighting performance benefits
- Fig. 1 : Hazard pictograms for MEKO
- Fig. 2 : Drying time performance : cobalt control vs. Borchi OXY-Coat
- Fig. 3 : Yellowing performance : cobalt control vs Borchi OXY-CoatEn ligne : https://drive.google.com/file/d/1TeaCkDa7Q6XT0vMXkgIGJ28Wqx5iK78a/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36111
in SURFACE COATINGS INTERNATIONAL > Vol. 104.4 (07-08/2021) . - p. 278-279[article]Réservation
Réserver ce documentHigh performance talcs for architectural paint systems in SURFACE COATINGS INTERNATIONAL, Vol. 104.4 (07-08/2021)
[article]
Titre : High performance talcs for architectural paint systems Type de document : texte imprimé Année de publication : 2021 Article en page(s) : p. 287 Langues : Anglais (eng) Catégories : Diluants
Produits commerciaux
Résistance à l'abrasion
Revêtements (produits chimiques):Peinture (produits chimiques)
Revêtements en bâtiment:Peinture en bâtiment
Taille des particules
TalcIndex. décimale : 667.6 Peintures Résumé : Durability and resistance requirements of paints and coatings are constantly increasing, but at the same time paints need to be environment friendly and safe for consumers. Talc is a natural minerai with a theoretical formula of Mg3Si4010(OH)2. Talc is the second most used extender in paints and coatings worldwide (after calcium carbonate). It is hydrophobic, inert and non-toxic.
ELEMENTIS offers three different talc familles: FINNTALC, PLUSTALC and MICROTALC. They all are high quality pure talc grades with lamellar particle form. FINNTALC grades are based on Finnish talc ore and they are purified by a flotation process that ensures high and constant product quality. PLUSTALC and MICROTALC grades are based on high quality, high whiteness talc ore and are targeted towards paints where super high whiteness is needed.
FINNTALC grades give well-balanced optical paint properties with excellent wet-scrub and stain resistance, and are efficient matting agents. The platy structure improves mud-cracking resistance and adhesion, and barrier properties. FINNTALC grades are also preferred extenders for paints using tinting systems, due to robust colour consistency.Note de contenu : - Fig. 1 : Wet-scrub resistance of high PVC paint
- Fig. 2 : Wet-scrub resistance (ISO 11998)
- Table : Product name, particles size and descriptionEn ligne : https://drive.google.com/file/d/1S62UITqMQymP5XIwQRlSDoRZePAB8enp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36112
in SURFACE COATINGS INTERNATIONAL > Vol. 104.4 (07-08/2021) . - p. 287[article]Réservation
Réserver ce documentBIOSUCCINIUM, a 100% biobased succinic acid, enables resin, coating, adhesive and sealant products with lower environmental footprint / Jiae Kim in SURFACE COATINGS INTERNATIONAL, Vol. 104.4 (07-08/2021)
[article]
Titre : BIOSUCCINIUM, a 100% biobased succinic acid, enables resin, coating, adhesive and sealant products with lower environmental footprint Type de document : texte imprimé Auteurs : Jiae Kim, Auteur Année de publication : 2021 Article en page(s) : p. 290-291 Langues : Anglais (eng) Catégories : Biomatériaux
Chimie écologique
Colles:Adhésifs
Economies d'énergie
Gaz à effet de serre -- Réduction
Mastics
Produits chimiques -- Suppression ou remplacement
Revêtements organiques
Succinique, AcideL'acide succinique est un diacide carboxylique aliphatique, dénommé également acide butane-1,4-dioïque et de formule semi-développée HOOC–CH2–CH2–COOH.
Il est présent dans tous les organismes vivants et intervient dans le métabolisme cellulaire, en particulier dans le métabolisme des lipides entre l'acide cétoglutarique et l'acide fumarique lors du cycle de Krebs dans la mitochondrie.Index. décimale : 667.9 Revêtements et enduits Résumé : BIOSUCCINIUM® sustainable succinic acid is produced from renewable, plant-based resources, which are converted via a unique low pH yeast process, a biotechnology process. BIOSUCCINIUM® offers an alternative to chemicals such as fossil-based succinic acid, adipic acid or terephthalic acid, conventional raw materials used for resins, coatings, adhesives and sealants. By using BIOSUCCINIUM® as a 'green' di-acid, it is possible to manufacture products with a reduced carbon footprint, and contribute towards reducing greenhouse gas emissions.The BIOSUCCINIUM® manufacturing process is also environnnentally sensitive: it uses non-fossil-based raw materials, sequesters carbon dioxide, is energy efficient and does not produce unnecessary by-products. These sustainability aspects are becoming increasingly important to downstream customers, who are increasingly facing new, more stringent environment regulations and growing consumer demand for more sustainable products. Note de contenu : - Succinic acid used in polyester resins - ANTEC 2011
- Succinic acid use in polyurethane dispersions
- Use of dimethyl succinate as a solvent and a raw material for pigments
- Poly(isosorbide succinate) for powder resins
- Use of succinic acid i nhigh solid alkyd resins
- Use of succinic acid in UV-curable acrylates
- Production
- Fig. 1 : Bio-based BIOSUCCINIUM is an alternative to fossil-based chemicals
- Fig. 2 : Reduction of carbon footprint using BIOSUCCINIUM vs. petrochemical adipic acidEn ligne : https://drive.google.com/file/d/1IA3tM8kAXJz6dq2Xj1wsSpmugY0gSfDY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36113
in SURFACE COATINGS INTERNATIONAL > Vol. 104.4 (07-08/2021) . - p. 290-291[article]Réservation
Réserver ce documentUV curing for the uninitiated / Richard Kennedy in SURFACE COATINGS INTERNATIONAL, Vol. 104.4 (07-08/2021)
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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 ultravioletIndex. 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 collisionsEn ligne : https://drive.google.com/file/d/1VFQLTQYhY1lY8-w0UXGvSSuJOd2yN7hl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36114
in SURFACE COATINGS INTERNATIONAL > Vol. 104.4 (07-08/2021) . - p. 294-296[article]Réservation
Réserver ce documentVMOX - Answering the challenges in UV-curable inks and coatings formulations / Torben Adermann in SURFACE COATINGS INTERNATIONAL, Vol. 104.4 (07-08/2021)
[article]
Titre : VMOX - Answering the challenges in UV-curable inks and coatings formulations Type de document : texte imprimé Auteurs : Torben Adermann, Auteur ; Elmar Kessenich, Auteur ; Simon Poulton, Auteur Année de publication : 2021 Article en page(s) : p. 299-301 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diluants
Revêtements (produits chimiques)
Vinyl méthyl oxazolidinoneIndex. décimale : 667.9 Revêtements et enduits Résumé : In all industrial areas, there is a constant drive to improve - from regulatory pressure for favorable toxicological profiles to enhanced technical performance and improved handling - and concerning UV-/EB-curable formulations, all application fields face similar challenges. BASF is the market leader in the supply of specialty vinyl monomers and is thus intrinsically motivated to support our'UV curing' customers. Our new monomer VMOX (vinyl methyl oxazolidinone) is a reactive diluent that helps address the current challenges. Compared to traditional reactive diluents in the industry, VMOX offers a favorable toxicological profile together with technical benefits and improved formulating capabilities. This includes it being liquid at room temperature, with a very low viscosity of 4 mPa/s (at 20°C), a high reactivity with acrylates, and low colour and odour characteristics.
Overall, VMOX is particularly suited for use as a reactive diluent in UV curing coatings, inks and 3D printing applications. While providing the beneficial technical performance vinyl monomers are known for, VMOX allows innovative formulations with a favourable toxicological profile, which recently has been a challenge and is increasingly difficult to overcome with current chemistries.Note de contenu : - Fig. 1 : VMOX structure and GHS pictogram comparison with other monomers
- Fig. 2 : Comparison of example inkjet and 3D printing formulation viscosity
- Table 1 : Composition comparison of example inkjet, coating and 3D printing
- Table 2 : Adhesion comparisôn on various polymer substrates: 34% reactive diluent, 60% other monomers and6% others (including photoinitiator). Manual scratch and tape test three days after curing : 0 for full
- Table 3 : Reactivity comparison o, other monomers and 6% others (including photoinitiator). Irradiation at 550 W/cm2
- Table 4 : Colour comparison of example formulations containing different reactive diluents (50% reactive diluent, 42% other monomers and 8% others (including photoinitiator)En ligne : https://drive.google.com/file/d/1R2wXJM-FnA27fQ4kAW0Tm4nkxraKOfOV/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36115
in SURFACE COATINGS INTERNATIONAL > Vol. 104.4 (07-08/2021) . - p. 299-301[article]Réservation
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