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Coalescents performance / Keith Middleton in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4488 (05/2005)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 195, N° 4488 (05/2005) . - p. 24-28 Titre : Coalescents performance Type de document : texte imprimé Auteurs : Keith Middleton, Auteur Année de publication : 2005 Article en page(s) : p. 24-28 Langues : Anglais (eng) Catégories : Coalescence (Sciences physiques) Copolymère styrène acrylique Copolymère vinyle acrylique Polyacryliques Résistance à l'abrasion Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements en bâtiment:Peinture en bâtiment Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : This paper explains the importance of choosing the right coalescent to improve the performance of water-based architectural coatings. Architectural coatings make up approximately 50% of a 23 billion-litre global paint market. In Europe, the end-users of architectural coatings are split evenly between professional painters and do-it-yourself (DIY) clientele with applications focused primarily on interior walls and ceilings, and exterior façades. Various European market drivers, such as environmentalism, regulatory limits and globalisation have accelerated a move in architectural coatings from solvent-based systems to water-based systems : - Environmentalism : an environmentally friendly push to lower VOC levels in architectural coatings, reflected by consumer preference for 'greener' architectural coatings. In most instances water-based coatings have lower VOC levels than those that are solvent-based. - Regulatory limits : European Union Directive 2004/42/EC for Decorative and Vehicle Refinishing Paints calls for a reduction in VOC levels in both solvent-based and water-based systems by 2007. The same regulatory calls for a more drastic reduction in VOC levels by 2010, making water-based systems the intuitive choice for architectural coatings. - Globalisation : various coatings manufacturers and even retail chains now institute global environmental policies, which have led to a rationalisation of product lines, the introduction of consumer labeling schemes, a move toward water-based systems, and an overall reduction in the VOC levels of these water-based paints. Note de contenu : - Water-based coatings systems - Choosing the right coalescent - Types of coalescents : esters, ester-alcohols - ether alcohols - glycols - Coalescent performance properties - Minimum film forming temperature (MFFT) - Scrub resistance - Shelf-life - Colour development - Low odour - Drivers Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27638 [article]

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Fluidisation improvements / Laurent Fosbach in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4488 (05/2005)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 195, N° 4488 (05/2005) . - p. 35-38 Titre : Fluidisation improvements Type de document : texte imprimé Auteurs : Laurent Fosbach, Auteur Année de publication : 2005 Article en page(s) : p. 35-38 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alumine Fluidisation Particules fines Revêtement poudre -- Additifs:Peinture poudre -- Additifs Silicates Index. décimale : 667.9 Revêtements et enduits Résumé : The author explores the developments in fluidisation of additives for powder coatings. All powder coating systems that use either tribo-charging or corona-ion equipment require a flow additive to optimise performance and prolong the stability of the coating material in storage during spraying and handling. Powder cohesion is the result of structural forces within the material that compete in various ways, depending on particle size, humidity and particle composition, with the gravitational forces experienced by the particles. When dry particle are larger than 75 microns, gravitational forces are greater that the structural or interparticle forces, and particle-particle attractions are negligible. As a result, powder can fluidise and flow with much less energy, since the particle can move independently of one another. When particles are less than 75 microns, structural forces tend to dominate and the resultant particle-particle interaction lead to a powder that is usually cohesive and will fluidise and flow poorly. This is particularly the case with particles 25 microns or less. Flow additives such as fumed silicate or fumed alumina, overcome this problem of they have the appropriate size distribution and an affinity with host particle's surface, a random mixture results. In this case the flow additive and host particle tend to self-associate and produce pockets of additive within a matrix of host particles. Note de contenu : - ORDERED RANDOM MIXTURES : Advantages - Treatment - Hausner ratio - ADDITION - IMPROVEMENTS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27639 [article]

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Smart coatings for plastics / Giorgio Macor in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4488 (05/2005)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 195, N° 4488 (05/2005) . - p. 39-40 Titre : Smart coatings for plastics Type de document : texte imprimé Auteurs : Giorgio Macor, Auteur ; Rosanna Telesca, Auteur Année de publication : 2005 Article en page(s) : p. 39-40 Langues : Anglais (eng) Catégories : Adhésion Matériaux intelligents Matières plastiques -- Revêtement Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : How Prime IT can help to overcome problems with plastic films that are difficult to laminate ? Plastic materials have inherently low wettability, mainly due to the lack of polar functional group on the surface, resulting in adhesion failure of inks, adhesives and varnishes. Ciba Speciality Chemicals have developed Ciba Prime IT, an innovative, patented technology to improve adhesion of UV-curable inks, coatings and adhesives on plastics. Adhesion of UV inks on plastics is sometimes poor, making it necessary to use physical or chemical treatments (as primers). Compared to Prime IT, conventional chemical treatment require higher quantities of product and additional procedures, involving for example the use of solvent and/or less environmentally compatible chemicals, while physical treatments such as corona have stability problems. Note de contenu : - Challenges - Principle of Prime IT - Prime IT in practice Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27640 [article]

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Stretching polyester limits / Ian Vallence in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4488 (05/2005)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 195, N° 4488 (05/2005) . - p. 41-42 Titre : Stretching polyester limits Type de document : texte imprimé Auteurs : Ian Vallence, Auteur Année de publication : 2005 Article en page(s) : p. 41-42 Langues : Anglais (eng) Catégories : Matières plastiques -- Revêtement:Matières plastiques -- Peinture Polyéthylène téréphtalate Index. décimale : 667.9 Revêtements et enduits Résumé : The author explains the advantages of the latest polyester coatings for the production of keyboards, touch screens and electronic display windows. Polyester, or PET (Polyethylene Terephthalate) is today commonly used in a wide range of electronics and interface applications: membrane touch panels; display windows and touch screens. In its raw form, however, polyester has limitations which only specialist coating technology can overcome. Prior to the introduction of specialist coated polyester films, polycarbonate had generally been selected for these applications. However, in applications where the film substrate is mechanically stressed, such as embossed (tactile) membrane touch switches, or where there is exposure to all but the most benign of solvents and chemicals, polycarbonate is an unsuitable choice. Typically, in polycarbonate tactile membrane switches, operating life is measured in the thousands rather than millions of operations. In terms of chemical resistance, polycarbonate is susceptible to attack by ketones, ethers and aromatic and chlorinated hydrocarbons. This means that even common products like petrol, brake fluid, most lubricating oils, paints and varnishes can badly affect the surface of polycarbonate switch panels. The relatively poor mechanical and chemical characteristics of polycarbonate are due largely to its amorphous (or formless) chemical structure. This means that the polymer molecules are relatively weakly linked together. Note de contenu : - The polyester advantage - Biaxal Orientation - Invisible coatings - Recent developments - Specialist treatment - Solutions Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27641 [article]

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