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Transparent UV curable fluorinated coatings / David Szum in EUROPEAN COATINGS JOURNAL (ECJ), N° 9/95 (09/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 9/95 (09/1995) . - p. 603-605 Titre : Transparent UV curable fluorinated coatings Type de document : texte imprimé Auteurs : David Szum, Auteur Année de publication : 1995 Article en page(s) : p. 603-605 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fluoropolymères Vernis -- Séchage sous rayonnement ultraviolet Tags : 'Durcissement  verni'  'Radiation  ultraviolette'  Liants  Fluorine  'Paint  film'  'Propriétés  mécaniques'  'Tensile  strength'  'Coefficient  friction'  optiques'  'Indice  réfraction'  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : This article introduces a transparent UV curable fluorinated coating with tough physical properties. It is highly resistant to a wide range of solvents (including water), has a low coefficient of friction and low cured film refractive index. It has excellent thermal, oxidative and UV stability, resists yellowing and is suitable for high speed application. Markets for this coating include electronics, fibre optic telecommunications and military applications. Note de contenu : - EXPERIMENTAL : Coating preparation - Film preparation - Dynamic Mechanical analysis (DMA) - Dynamic solvent sensitivity - Tensile properties - Dynamic coefficient of friction - Refractive index - RESULTS AND DISCUSSION : - Dynamic weight change study - Dynamic mechanical analysis and tensile properties - Coefficient of friction - Refractive index Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11354 [article]

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UV curing powder coatings for heat sensitive substrates / Dietmar Fink in EUROPEAN COATINGS JOURNAL (ECJ), N° 9/95 (09/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 9/95 (09/1995) . - p. 606-608 Titre : UV curing powder coatings for heat sensitive substrates Type de document : texte imprimé Auteurs : Dietmar Fink, Auteur ; Gerhard Brindopke, Auteur Année de publication : 1995 Article en page(s) : p. 606-608 Langues : Anglais (eng) Catégories : Peinture poudre -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : A new UV curable system allows formulation of powder coatings for application on heat sensitive materials such as wood and plastics, which avoids irritation problems often encountered with liquid UV curable systems. The combination of environmentally friendly powder technology and radiation curing results in a system which crosslinks rapidly at low temperature and which produces almost no volatile emissions during curing. Note de contenu : - Objectives and initial experience - Powder coatings with extenders and/or with pigments Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11355 [article]

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Modern UV inks : A novel shade of green / Richard Holman in EUROPEAN COATINGS JOURNAL (ECJ), N° 9/95 (09/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 9/95 (09/1995) . - p. 610-612 Titre : Modern UV inks : A novel shade of green Type de document : texte imprimé Auteurs : Richard Holman, Auteur Année de publication : 1995 Article en page(s) : p. 610-612 Langues : Anglais (eng) Catégories : Encre -- Séchage sous rayonnement ultraviolet Encre -- Séchage sous rayonnement électronique Encre d'imprimerie Flexographie Lithographie Pollution -- Lutte contre Sérigraphie Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : Since the 1960s there has been steady growth in the use of radiation curable printing inks and press applied varnishes. Initially, this market was driven by the advantage of almost instant drying which UV technology can offer. This still remains an important consideration. However, in today's environmentally conscious world the solvent-free, energy efficient aspects of radiation curing attract increasing attention. Developments in raw materials and in formulation are openong the way for use of UV inks in the hitherto difficult areas of flexography and gravure printing. New systems that make use of photochemically induced cationic polymerisation of epoxide resins and vinyl ethers are being explored. Note de contenu : - The solvent problem - The waterborne alternative - Energy considerations - UV lithographic inks - Press applied varnishes - UV silk screen inks - UV flexographic and gravure inks - The electron beam curing situation - The recycling issue - The contra-indications Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11356 [article]

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Film shrinkage and associated roughening / Rex Field in EUROPEAN COATINGS JOURNAL (ECJ), N° 9/95 (09/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 9/95 (09/1995) . - p. 614-620 Titre : Film shrinkage and associated roughening Type de document : texte imprimé Auteurs : Rex Field, Auteur Année de publication : 1995 Article en page(s) : p. 614-620 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Coating formulations using micronized silica gels as matting agents are examined. Novel results obtained using a scanning laser profilometer are presented. Observations of film thickness and surface roughness were made in real-time during the drying process. It is shown that shrinkage near the end of drying contributes disproportionately to roughness. A micro-rheological model is developed, supported by SEM images of surfaces and cross-sections of dried films. Difficulties with matting formulations such as powder and some radiation-curable coatings are discussed in terms of this model. Note de contenu : - The nature of matt paint films - The formation of matt paint film - Non contacting profilometry and drying of paint films - Coating formulations - Film spreading - Scanning profilometry during film drying - Determination of film profile - Calculation of film thickness and roughness from the profiles - Profilometry and film drying - Film shrinkage - Surface roughening, and its onset - Formation of matt surfaces and the mtting of low-VOC coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11362 [article]

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How do coatings actually dry? / Robert D. Athey in EUROPEAN COATINGS JOURNAL (ECJ), N° 9/95 (09/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 9/95 (09/1995) . - p. 623-627 Titre : How do coatings actually dry? Type de document : texte imprimé Auteurs : Robert D. Athey, Auteur Année de publication : 1995 Article en page(s) : p. 623-627 Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : The substrates one coats or paint for a variety of reasons may be divided into several categories. They may be heat conductive or not, and they may porous or not. Each of these types of substrate may affect how the coating dries - in rate or in appearance. The GGSCT Technical Committee investigated the drying rates gravimetrically, and examined the coatings for defects after the drying. Examination of the data was done with statistical techniques to determine the importance of the seven variables designed into the study. The best models showed: 1. The data best fit hyperbolic function of time; 2. The most important variables were time, temperature and film thickness; 3. The inclusion of pigment at lower than PVC slowed drying in most models, though possibly not statistically significant; 4. The porosity and heat conductivity of the substrate were occasionally important minor variables in some models showing drying retardation, if statistically significant at all, and; 5. The minor variable contrasting latex versus solvent was important in only one model, showing retardation of drying of water, if significant. The statistical models do not exactly reproduce the actual drying curves, and require more sophisticated approaches. The models used are excellent guides to the sense of what is happening. However, for reasons of imperfect fit to the actual drying rate curves, the statistical models have been discarded. However, the observed drying curve, having two linear sections, has a more compelling rationale for being the preferred characterization. The two linear sections of the observed drying curve are due to the solution evaporation rate control in the earlier stage, and the solvent permeation to the surface controlling the latter stage. Note de contenu : - Mathematical modelling - Model design - Result of modelling Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11364 [article]

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