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Echo-nomical testing / Vitaly Buckin in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4456 (09/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4456 (09/2002) . - p. 10-14 Titre : Echo-nomical testing Type de document : texte imprimé Auteurs : Vitaly Buckin, Auteur ; Evgeny D. Kudryashov, Auteur Année de publication : 2002 Article en page(s) : p. 10-14 Langues : Anglais (eng) Catégories : Contrôle non destructif Spectroscopie de résonance acoustique Ultrasons Index. décimale : 667.9 Revêtements et enduits Résumé : It can be difficult and time-consuming to predict the behaviour of emulsions other complex systems, such as paints, but the use of ultrasound could offer some interesting alternatives. The author show how valuable information on liquid dynamics, such as stability prediction, can be obtained. High-Resolution ultrasonic Spectroscopy (HR-US) is a new technique for material analysis. This is based on the measurements of velocity and attenuation on acoustical waves at high, ultrasonic frequencies propagating through materials. Optical transparency is not required because ultrasonic waves propagate through opaque systems, thereby making the technique relevant for non-transparent as well as transparent samples. In all cases the technique provides a fast and non-destructive analysis of samples. HR-US ultrasonic spectrometers can be used in a variety of segments, including the polymers, paints and coatings industry, for an equally versatile range of tests. A number of applications are shown in Table 1. Note de contenu : - Application areas - Stability testing -Improving storage - Understanding fluid dynamics - Micelle formation - Ultrasound and alternatives - FIGURES : 1. Change in ultrasonic velocity and attenuation coefficient enables determination of agglomeration and precipitation as calcium is increased - 2. In the first emulsion, the regular cycle of ultrasonic velocity and attenuation with the thermal cycles shows that this emulsion has thermal stability. In contrast, the shape of the red line is more irregular, showing that emulsion 2 has destabilised on the first cycle (at 40°C) - 3. Ultrasound can be used to determine the Critical Micelle Concentration, as shown at 25mmol surfactant for the blue line. At this point the surfactant molecules form micelles, resulting in a drop in ultrasonic velocity Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27990 [article]

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Enhancing cleanability / Janos Hajas in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4456 (09/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4456 (09/2002) . - p. 16-20 Titre : Enhancing cleanability Type de document : texte imprimé Auteurs : Janos Hajas, Auteur Année de publication : 2002 Article en page(s) : p. 16-20 Langues : Anglais (eng) Catégories : Copolymère silicone acrylate Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Peinture -- Lavage Polyuréthanes Revêtements -- Additifs:Peinture -- Additifs Revêtements anti-graffitis Revêtements antisalissures:Peinture antisalissures Index. décimale : 667.9 Revêtements et enduits Résumé : The author writes about a new additive which has been introduced to enhance the surface cleaning properties of coatings. A new? OH-functional silicone modified acrylate additive will be introduce to enhance the surface cleaning properties (cleanability) of coatings. Crosslinkable via OH-groups, the additive provides long lasting significant improvements in cleanability so that adhering dust and dirt particles as well as graffiti can be removed much easier compared to 'normal' surfaces. Results in various types of coatings (two-pack polyuethanes, thermoset melamine topcoats, and so on) will be presented. Present and potential new applications for silicone modified crosslinkable acrylates in various types of coatings will be highlighted. Note de contenu : - Test results - Energy and tension - Liquid coatings - Dirt and dust release properties - Anti-fouling properties - Anti-graffiti properties - Practical applications - FIGURES : 1. Shows the properties of this new additive - 2. Surface tension (polar + dispersed) of crosslinked PU coating films - 3. Surface tension (polar component) of crosslinked PU films - 4. Improvement of surface cleanability with silicone modified additive - 5. Influence of the additive level on fouling (slime, barnacles, worms and seaweed) - 6. Influence of the additive level on fouling (fungus) - TABLE : Surface tension reduction with two different additives Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27991 [article]

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Fashes of inspiration / Dawn Skinner in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4456 (09/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4456 (09/2002) . - p. 22-24 Titre : Fashes of inspiration Type de document : texte imprimé Auteurs : Dawn Skinner, Auteur Année de publication : 2002 Article en page(s) : p. 22-24 Langues : Anglais (eng) Catégories : Matières plastiques -- Revêtement:Matières plastiques -- Peinture Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : The author reviews the development of UV curing chemistries and techniques for plastic components, their current uses and future potential. UV is rapidly becoming the technique of choice for curing coatings in the plastic components industry, but it has not been all plain sailing. Complex part shapes, temperature sensitive substrates and demanding finish quality are just some of the challenges faced by chemistry suppliers and equipment manufacturers alike. Until recently, coaters and decorators of plastic components had no option but to paint or coat pieces using water or solvent-based products and then to dry them all thermally in large curing ovens. Though effective, the water-based coatings required high energy input to drive off the water content, the VOC emissions from drying solvent-based formulations required expensive containment or treatment equipment and the drying ovens took up a huge amount of space. Identifying and developing a drying technology that could eliminate some or all of these problems would revolutionise the production process and massively enhance the potential for coated plastic components. UV curing was an obvious contender. Note de contenu : - Development processes - The chemistry - Challenges and solutions - Exception that proves the rule - The UV curing equipment - The Future Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27992 [article]

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Scandinavian whites / Elizabeth Reck in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4456 (09/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4456 (09/2002) . - p. 25-27 Titre : Scandinavian whites Type de document : texte imprimé Auteurs : Elizabeth Reck, Auteur ; Stephen Seymour, Auteur Année de publication : 2002 Article en page(s) : p. 25-27 Langues : Anglais (eng) Catégories : Catalyse Dioxyde de titane Paratoluènesulfonique, Acide L'acide paratoluènesulfonique, ou APTS est un acide sulfonique, utilisé dans des synthèses organiques. Il est fréquemment utilisé en tant que catalyseur de la réaction d’estérification. Il est en général synthétisé par sulfonation du toluène. C'est un très puissant acide organique (1 million de fois plus puissant que l'acide benzoïque par exemple), qui, contrairement à la plupart des acides minéraux, n'est pas un oxydant. Il est de plus l'un des rares acides forts à se présenter sous forme solide. pH Réticulants Réticulation (polymérisation) Revêtements -- Additifs:Peinture -- Additifs Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : The presence of titania can have a big influence on curing for acid catalysed systems, such as wood coatings for Scandinavian markets. The author show how to optimise these systems. In industrial paints, the choice of TiO2 generally has little effect on cure rate and degree of cure. However, in paints where cure is catalysed by an acid, such as paratoluene sulphonic acid (PTSA), the TiO2 affects the curing mechanism. PTSA is still frequently used as a catalyst in woodcoatings and high solids industrial paints. This technology is most commonly used in the UK and Scandinavia. Some decline in the technology could be expected as powder coatings become an increasingly popular alternative to industrial stoving paints. However there is also currently a trend towards lower stoving schedules, which could lead to higher levels of catalysts being used. Note de contenu : - Thin deposits - Expanding test series - Gloss testing - The impact of resins - FIGURES : 1. Effect of pH on stability - 2. Cure performance can be dramatically affected by pigment type - 3. The effect of PTSA on gloss and cure with acidic and basic pigment - 4. Effects of PTSA on gloss and cure time Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27998 [article]

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A dutch portrait of frames / Johan Nienhuis in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4456 (09/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4456 (09/2002) . - p. 38-40 Titre : A dutch portrait of frames Type de document : texte imprimé Auteurs : Johan Nienhuis, Auteur Année de publication : 2002 Article en page(s) : p. 38-40 Langues : Anglais (eng) Catégories : Bois -- Revêtements protecteurs Durée de vie (Ingénierie) Essais (technologie) Primaire (revêtement) Revêtements -- Effets du climat Revêtements en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Last month, in the firts part of this article, PPCJ covered the reasons to switch to waterborne wood primers and this month, the author describes testing and development. To evaluate the technical feasibility of waterborne primers, an extensive testing program was set up. These test series are intended to evaluate the performance of the primers and to validate their performance compared to solventborne primers. The test program is a result of cooperation of paint manufacturers, joinery industries and an organisation controlling the overall quality of joinery products. The usual test program consists of outdoor exposure and laboratory tests. Paint systems are exposed outside for four years. The complete paint system should have good outdoor durability during these four years, while the primer should have wood protecting properties on its own for one year's exposure. The outdoor exposure L-joints are evaluated for dry and wet adhesion, cracking, blistering, chalking and flaking. These durability tests are performed after optimum drying. Note de contenu : - Water uptake tests - General materials and methods - Evaluation of test methods - Colour variations - Alterning the drying conditions - Overall technical feasibility - Cost saving scenarios Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27999 [article]

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