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Meeting the colour delivery challenge / J. A. Graystone in SURFACE COATINGS INTERNATIONAL, Vol. 80, N° 11 (11/1997)

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 80, N° 11 (11/1997) . - p. 516-523 Titre : Meeting the colour delivery challenge Type de document : texte imprimé Auteurs : J. A. Graystone, Auteur Année de publication : 1997 Article en page(s) : p. 516-523 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture  Fabrication  Pigment  Dispersion  Formulation  'Propriété  optique'  Couleur Index. décimale : 667.9 Revêtements et enduits Résumé : Control of colour has always represented a challenge to the industry, and one which has often only been met by a strategy of post adjustment usually involving several test cycles. New challenges have arisen from both environmental legislative pressures and the relentless quest for quality, efficiency and operational excellence. The desire for 'Right First Time'(RTF) manufacture is an example of the latter, which is at variance with the post adjustment philosophy.One response has been a greater use of blending and tinting systems using pigment concentrates, not only at the point of sale, but also for factory manufacture.This does not eliminate the need for adjustment of the concentrates themselves but it removes this step from the critical path.Environmental pressures have manifested themselves in changes to pigment manufacturing processes with some grades disappearing altogether and others needing reformulation. Water-borne and high solids technologies present new challenges to achieve pigment dispersionwith the right rheological balance and this has resulted in new generations of polymeric pigment dispersants. On the equipment side the need for emission control has resulted in closed loop mills, at the same time the available energy intensity has increased to allow faster and in some cases more complete processing. recirculatory rather than batch mode processing has give more scope for instrumental process control. Exploiting these opportunities is enhanced by an understanding of the underlying physical and chemical processes and the accuracy with which they can be measured. Note de contenu : - COLOUR DELIVERY - ATTRIBUTES OF COLOUR AND COLOUR THEORY : Hue and strength - FORMULATION ASPECTS OF PIGMENT DISPERSION : Pigment selection - Dispersant selection - Requirements for stable pigment dispersion - MANUFACTURING PHILOSOPHY AND TEST CAPABILITY : Test capability - Adjustment strategy - CONTROLLING THE PRODUCTION PROCESS : Millbase design - Control options - Scale up - DEVELOPMENTS IN PROCESSING EQUIPMENT Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17258 [article]

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Water-borne fluorinated polyolefins in coatings / S. Kuwamura in SURFACE COATINGS INTERNATIONAL, Vol. 80, N° 11 (11/1997)

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 80, N° 11 (11/1997) . - p. 525-528 Titre : Water-borne fluorinated polyolefins in coatings Type de document : texte imprimé Auteurs : S. Kuwamura, Auteur ; T. Hibi, Auteur Année de publication : 1997 Article en page(s) : p. 525-528 Note générale : Bibliiogr. Langues : Anglais (eng) Tags : 'Peinture  eau'  Liant  Polyoléfine  'Polymère  fluoré'  Formulation  Adjuvant  Réticulant  'Propriété  physique'  Feuil  Durabilité  émulsion' Index. décimale : 667.9 Revêtements et enduits Résumé : Environmental friendly coating having high performance is one of the demands of the coating industries. Fluoropolymers satisfy such a demand. Fluoropolymers were developed by Du Pont and 3M about 60 years ago. Since then, they have been used in various fields due to the excellent properties derived from the unique molecular structure. However, the applications were limited, for example, the lubrication agents and non-stick coatings, because of difficulties of processing. In the case of coating applications they need a high temperature process to form a film. Since the early 1980s, new means have been developed whereby a fluoropolymer can be used in a manner similar to a conventional coating resins. Recently, as a result of the developments the market has gradually expanded. Concurrently, there has been strong demand in the market to develop water-borne fluoropolymers for coatings. On the other hand, inorganic polymers giving super durable coatings. The film obtained from the polymers show high durability and good resistance to dirt pick-up. However, a tendency to give small cracks in the film is observed during exposure. In this paper, newly developed water-borne fluoropolymers will be discussed. Furthermore, a fluoropolymer hybridized with an inorganic compound will be discussed. The aim of this study is to obtain novel coatings with high durability and good resistance to dirt pick-up, especially the ability to shed dirt, without film defects. Note de contenu : - FLUORINE CHEMISTRY - EXPERIMENTAL : Polymer procedure - Paint formulations - Crosslinking with epoxy-silane compounds - Durability measurement - RESULTS AND DISCUSSION : Physical properties - Durability - Dirt shedding - Application technology Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17259 [article]

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Onshore applications for intumescent coating systems / R. J. Ramsay in SURFACE COATINGS INTERNATIONAL, Vol. 80, N° 11 (11/1997)

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 80, N° 11 (11/1997) . - p. 529-531 Titre : Onshore applications for intumescent coating systems Type de document : texte imprimé Auteurs : R. J. Ramsay, Auteur Année de publication : 1997 Article en page(s) : p. 529-531 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture  ignifuge'  intumescente'  'Protection  feu'  'Construction  métallique'  Durabilité  Acier Index. décimale : 667.9 Revêtements et enduits Résumé : In the UK thin-film intumescent coatings have been used for over twenty years to protect steel frame buildings from fire-induced structural collapse. Initially, intumescent systems could provide only half hour protection and could be used only in dry internal locations. It is now possible to obtain intumescent systems that can provide up to two hours fire resistance to steelwork in exposed external locations. In order to function correctly, in the event of a fire, intumescent systems have to be correctly specified, applied and maintained. Intumescent fire protection has several advantages over concrete, boards and non intumescent sprays. For example : - It provides thin-film fire protection. This enables architects to express the steelwork in their designs. Normally intumescent coatings are applied at between 0.3 and 3 mm thickness so that the character of the steelwork is preserved. This allows intumescent systems to act as decorative as well as protective coatings. - They are light weight and do not add significantly to the load on the steel structure. - They are relatively easy to apply and by the same application equipment as used for heavy-duty coatings. Note de contenu : - Specification - Application - Durability - Laboratory evaluation - Natural exposure - Recommendations for monitoring durability Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17266 [article]

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