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POLYMERS PAINT COLOUR JOURNAL - PPCJ . Vol. 206, N° 4624Building bridges. That last with protective coatingsMention de date : 09/2016 Paru le : 28/09/2016 |
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Ajouter le résultat dans votre panierSilicone-based pH-adjuster : high efficiency, odourless and zero-VOC / Pedro Lazzarin Marani in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4624 (09/2016)
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Titre : Silicone-based pH-adjuster : high efficiency, odourless and zero-VOC Type de document : texte imprimé Auteurs : Pedro Lazzarin Marani, Auteur Année de publication : 2016 Article en page(s) : p. 18-20 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amino-alcools
Copolymère styrène acrylique
Copolymère vinyle acrylique
Ester vinylique de l'acide versatique
Méthylsiliconate de potassium
pH
Revêtements -- Additifs:Peinture -- Additifs
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).Index. décimale : 667.9 Revêtements et enduits Résumé : One of the biggest challenges that the coatings industry is currently facing is to ally a good product performance with sustainability, without impacting formulation costs. Several raw materials are available in the market, providing these two key factors to decorative coatings, although some components in a formulation interact with each other, affecting negatively its individuel effects. Among these components, there is the pH adjuster, as many of the existing products in the market have other side features that affect the performance of the resin, the dispersant, the defoamer and/or the biocide, among many others.
In this context, the development of silicone-based pH-adjusters brought several advantages as a consequence of their high adjustment capacity, allying improved performance, formulation costs reduction and sustainability. Their main characteristic is to be odourless and zero-VOC products, making it possible to develop odourless coatings or tow-VOC coatings, one of the great challenges for the Brazilian coating manufacturers. Adding to that, due to its high pH value, around 14, these products have a high adjustment power, reducing up to 75% the pH adjuster dosage level, depending of the evaluated formulation.
Besides being able to be used in several coatings systems (Styrene-Acrylic, Acrylic, Vinyl-Acrylic, VeoVA or VAE) and PVC levels, due to their silicone nature, these products also help in the film forming process, acting as a minor scale crosslinking agent, leading to improvements in the water resistance, scrub resistance and colour maintenance properties. Additionally, they present excellent results in storage stability and compatibility with several other raw materials, including but not restricted to biocides, defoamers and dispersants.Note de contenu : - Table 1. Comparative results obtained in laboratory betweenpotassium methylsiliconate and amino-alcohol
- Table 2. Results obtained for styrene-acrylic systems (S-A)
- Table 3. Results obtained for acrylic systems (A-A)
- Table 4. Results obtained for vinyl-acrylic systems (V-A)
- Table 5. Results obtained for VeoVA systemsEn ligne : https://drive.google.com/file/d/1bQ-vRdEsqjCoVH2mVCnEorGRViLuSAtl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27105
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 206, N° 4624 (09/2016) . - p. 18-20[article]Réservation
Réserver ce documentPolyaspartic coatings protect virginia steel brifges for more than a decade / Ahren Olson in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4624 (09/2016)
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Titre : Polyaspartic coatings protect virginia steel brifges for more than a decade Type de document : texte imprimé Auteurs : Ahren Olson, Auteur ; Todd Williams, Auteur ; Mark Hudson, Auteur ; C. Wayne Fleming, Auteur Année de publication : 2016 Article en page(s) : p. 21-26 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Anticorrosifs
Anticorrosion
Métaux -- Revêtements protecteurs
Polyuréthanes
Ponts métalliques -- Revêtements protecteurs
Primaire (revêtement)
Revêtements multicouches
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : A study on the use of a high-build, two-coat polyaspartic urethane coating system, showed increases in productivity, with a zinc-rich primer for the protection of steel bridges.
This research concerns the field performance of PAS two-coat coating systems and further validated the technology's excellent corrosion prevention noted in many previous investigations. With performance being equal, PAS two-coat systems can provide significant value to bridge owners in the form of overall cost reduction in painting operations, accelerated painting schedules and milder traffic congestion headaches. An extra performance benefit : PAS two-coat systems also exhibit excellent edge protection areas in which corrosion is most likely to start.
However, this study also demonstrated that all coatings applied to steel bridges with timber bridge decks provided reduced corrosion protection than the same coatings applied to steel bridges with concrete decks. The reduced coating performance in timber deck bridges was caused by the flexing and spacing of deck timbers, which allowed road salts and water to penetrate to the steel girder, accelerating corrosion.Note de contenu : - BRIDGE DESCRIPTIONS AND INSPECTION PROCEDURE
- BRIDGES WITH CONCRETE DECKS : MCU three-coat system with concrete deck - PAS two-coat system with concrete deck
- BRIDGES WITH TIMBER DECKS : MCU three-coat system with timber deck and asphalt overlay - PAS two-coat system with timber deck and asphalt overlay
- TRUSS BRIDGES : Truss bridges with timber decks and asphalt overlayEn ligne : https://drive.google.com/file/d/16bRlc5av3xOh2urm_WMdTrxGmBdZYijN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27740
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 206, N° 4624 (09/2016) . - p. 21-26[article]Réservation
Réserver ce documentTaking the pressure out of formulating pressure-sensitive adhesives / Hitesh Soni in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4624 (09/2016)
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Titre : Taking the pressure out of formulating pressure-sensitive adhesives Type de document : texte imprimé Auteurs : Hitesh Soni, Auteur Année de publication : 2016 Article en page(s) : p. 28-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésifs -- Additifs
Adhésifs sensibles à la pression
AziridineL'aziridine (n.f.) ou azacyclopropane est le composé organique cyclique de formule brute C2H5N. Elle est aussi le composé parent des aziridines et du groupe fonctionnel qui correspond à un hétérocycle à trois côtés composé d'une amine et de deux groupes méthylène.
Cisaillement (mécanique)
Epoxydes
Essais d'adhésion
Essais de pelage
Polyacryliques
Polymères hydrosolubles
RéticulantsIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : A new tetrafunctional epoxy reactive modifier is increasingly use as a non-mutagenic, drop-in replacement for polyfunctional aziridine in adhesives and coatings formulations.
Industrial coatings and adhesives formulations often rely on crosslinkers to boost key performance properties, such as strength, wear and chemical resistance. This is especially so in two-component (2K) systems, where crosslinkers are a critical part of the 2K package. While crosslinkers greatly enhance the performance in the end product, they can also present formulating challenges - processing, pot-life or health and safety concerns - and newer alternatives have been developed to address these needs.
Formulating pressure-sensitive adhesives (PSAs) presents a number of complex challenges. The adhesive must flow and set without activation from anything more than the pressure of a hand, remain permanently tacky, exhibit a strong bond - often to a variety of substrates, such as wood, glass or metal for as long as the application requires or until the end user decides to remove it. Once removed, the PSA must exhibit the necessary cohesive strength that it can be easily removed without leaving adhesive residue behind.
The wide span of tapes, labels, protective films and more that use this technology, rely on an effective crosslinker to achieve many of their key performance properties, including cohesion, shear strength, chemical resistance, performance at high or low temperatures and peel adhesion.
Poiyfunctional aziridine is a common choice as a crosslinker in many waterborne PSAs and coatings formulations due to its efficacy and economy. However, polyfunctional aziridine has recently come under fire in both the USA and EU markets, due to its status as a potentiel mutagen. Its reduced efficacy over relatively short dwell times in water is also a concern ; the net effect can lead to a variation in adhesive properties, as well as problems with manufacturing efficiency. These challenges have added to the concerns that a PSA formulator must consider and lead to a growing need for a crosslinker option that is less hazardous to human health, more stable over time and can also offer the same or greater hardness and shear adhesion for adhesive formulations. One alternative, which has been demonstrated as an effective drop-in replacement, is a new tetra-glycidyl m-xylene diamine (ERISYS® GA-240), a tetrafunctional epoxy reactive modifier.Note de contenu : - Formulation
- Testing and results : Peel adhesion - Shear adhesion
- FIGURES : 1. Polymer chain of water-soluble, acrylic PSAs - 2. Increasing molecular weight will result in improved cohesive strength and shear adhesion along with decreased peel adhesion and tack - 3. Typical structures for a polyfunctional aziridine and ERISYS GA-260 epoxidised metaxylenediamine crosslinkers - 4. Instron machine was used to measure peel adhesion - 5. Above : Results of peel adhesion testing with the new tetra-glycidyl m-xylene diamine reactive modifier - 6. Above right : results of peel adhesion testin gwith a polyfunctional aziridine crosslinker - 7. To test shear adhesion, tape coated with the PSA is affixed to a stainless steel plate and a weight suspended from it - 8. Below : use of the new tetra-glycidyl m-xylene diamine (right) resulted in improved cohesive strength and little to no adhesive transfer compared to control (left) - 9. Shear adhesion, one-day cure at RT (at higher crosslinker levels results exceed 3100 min) - 10. Shear adhesion, three-day cure at RT (at higher crosslinker levels results exceed 3100 min) - 11. Shear adhesion, five-day cure at RT (at higher crosslinker levels results exceed 3100 min)En ligne : https://drive.google.com/file/d/1wY7MJaLdEBbC52C7FSLheRzpbfSf_wMQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27741
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 206, N° 4624 (09/2016) . - p. 28-30[article]Réservation
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Titre : Hybrid adhesion Type de document : texte imprimé Auteurs : Luc Peeters, Auteur Année de publication : 2016 Article en page(s) : p. 31-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésifs structuraux
Adhésion
Chlorure de polyvinyle
Composites à fibres
Dilatation (thermodynamique)
Matières plastiques -- Collage
Polycarbonates
Polyesters
Polyéther de silicone
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
Polystyrène
Terpolymère acrylonitrile butadiène styrèneIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : A novel technology is provided to cope with adhesion of plastics.In transportation, construction and building markets the use of lightweight plastic materials keeps growing as these materials will improve the energy efficiency. For instance, fuel consumption in cars is out and buildings can be more efficiently insulated. Besides practical uses, plastics also allow nicer designs, as shaping of plastics in complex forms is easier. This trend results in hybrid assemblies, as different types of plastics, metals, wood, will have to be joined together and require structural 'hybrid' adhesives, which can adhere materials with different expansion rates and exhibit high adhesive strength to replace welding, riveting and nailing. Note de contenu : - Silane terminated polyethers
- Adhesion to plastics
- FIGURES : 1. Comparison of the different adhesive technologies with the Kaneka technologies - 2. Lap shear strength of an acryl modified MS polymer-based adhesive to unprimed stainless steel,polymethylmethacrylate (PMMA), polyvinylchloride (PVC), fibre reinforced polyester (FRP), acrylonitrile-butadiene-styrene rubber (ABS), polystyrene (PS) and polycarbonate - 3. Thermal expansion coefficients of different materials
- TABLE : 1. Basic properties of an adhesive based on a new high strength MS polymerEn ligne : https://drive.google.com/file/d/1DZUT7BfpR5uwZ8DGOeqM1pSeJoykrMU8/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27742
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 206, N° 4624 (09/2016) . - p. 31-32[article]Réservation
Réserver ce documentUse of optical density and TiO2 light scattering / R. T. Abrahao in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4624 (09/2016)
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Titre : Use of optical density and TiO2 light scattering Type de document : texte imprimé Auteurs : R. T. Abrahao, Auteur ; R. Umemura, Auteur ; Michael P. Diebold, Auteur Année de publication : 2016 Article en page(s) : p. 33-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dioxyde de titane
Dispersions et suspensions
Lumière -- Absorption
Lumière -- Diffusion
Revêtements en bâtiment:Peinture en bâtiment
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : Optical density is a technique to evaluate light scattered by particles suspended in a liquid paint. The authors discusses how to identify optimisation potential in architectural coatings.
Optical density (OD) is a technique for evaluating the amount of light scattered by particles suspended in a liquid paint. Using an improved OD procedure, it is now possible to quantify titanium dioxide (TiO2) light scattering efficiency in a paint without knowing the complete paint formulation. This information can be coupled with conventional spread rate measurements, which measure the scattering coefficient of the TiO2 in the dry film, allowing the paint formulator to determine the likely benefit of improving initial TiO2 dispersion or improving dispersion stability in an under performing paint.
In addition, application of the improved OD test and the conventional spread rate procedure to South and Latin American commercial paints revealed how well the TiO2 particles were dispersed in the liquid paint and how evenly they were distributed in the dry paint film - parameters termed the TiO2 dispersion efficiency and the formulation efficiency, respectively. A wide range of efficiencies was seen in the commercial paints, with almost 20% of the paints demonstrating an opportunity to benefit from improved TiO2 dispersion efficiency, while 55% showed an opportunity to improve formulation efficiency.Note de contenu : - TiO2 dispersion in dry film
- Optical density
- Spread rate
- Application to commercial paintsEn ligne : https://drive.google.com/file/d/1FJTiJU_bezN76NEs74yJ56ZX2Pu2nb-s/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27743
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 206, N° 4624 (09/2016) . - p. 33-36[article]Réservation
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