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How to optimize pigment grinding / Carlos E. Vignolo in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/95 (07-08/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/95 (07-08/1995) . - p. 527-529 Titre : How to optimize pigment grinding Type de document : texte imprimé Auteurs : Carlos E. Vignolo, Auteur Année de publication : 1995 Article en page(s) : p. 527-529 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fragmentation Pigments Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : The time evolution of different single-pigment mill bases was investigated measuring fineness with a conventional coating grind gage. We propose a simple two-parameter model for the description of a pigment dispersion into liquid vehicles as function of the grinding time. Although the whole process depends on a complex balance between grinding equipment, pigment and vehicle, it is possible to recognize a simple well-known pattern for the breakup of pigment particle agglomerates. This allows us to establish a quantitative criterion and a practical rule for the effectiveness of the dispersion operation without limitation regarding the quality or nature of the binder or wetting agents. Note de contenu : - Two-parameter model for the break-up of pigment particle agglomerates - Gage scales in fineness-of-grind determinations - Effectiveness of the dispersion operation Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11348 [article]

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Reactive oxazolidine moisture control / Thomas Johnson in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/95 (07-08/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/95 (07-08/1995) . - p. 530-533 Titre : Reactive oxazolidine moisture control : Additives for PU coatings Type de document : texte imprimé Auteurs : Thomas Johnson, Auteur Année de publication : 1995 Article en page(s) : p. 530-533 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Haut extrait sec Oxazolidine Polyuréthanes Résistance à l'humidité Revêtements -- Additifs:Peinture -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Novel moisture control additives have been developed for use in higher solids polyurethane coatings. These oxazolidine-based compounds eliminate the adverse effects of humidity often seen during the application of two-pack polyurethane systems. Problems such as down glossing, pinholing, hazing and bubble entrapment can be prevented with proper application of this chemistry. These additives also remove moisture from one- and two- pack polyurethane coatings during their manufacture, thus providing superior shelf life and film properties. Note de contenu : - Effects of moisture polyurethane coatings - Oxazolidine chemistry - Hydrolysis screening - Pigment grind drying - One-component systems - Humidity control VIII- Film properties Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11351 [article]

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Measuring copper release from antifouling paints / Eivind A. Berg in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/95 (07-08/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/95 (07-08/1995) . - p. 534-538 Titre : Measuring copper release from antifouling paints Type de document : texte imprimé Auteurs : Eivind A. Berg, Auteur Année de publication : 1995 Article en page(s) : p. 534-538 Langues : Anglais (eng) Catégories : Revêtements antisalissures:Peinture antisalissures Tags : 'Peinture  antisalissure'  Lessivage  Cuivre  Libération  'Méthode  mesure' Index. décimale : 667.9 Revêtements et enduits Résumé : Copper leaching rates from antifouling paints can be established by using a method very similar to ASTM D5108-90 (Standard Test Method for Organotin Release Rates from Antifouling Coating System in Sea Water) except for one important modification : the continuous replacement of fresh sea water where the painted samples are stored (holding tank). With this included in the experimental set-up, the copper concentration stabilizes after three weeks. The copper concentration is proportional to the amount of copper available for leaching after stabilization. These results have made us confident that this modification of ASTM D5108-90 is well adapted to copper release rate measurements. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11352 [article]

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Storage stability of epoxy resins emulsions / Alex Wegmann in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/95 (07-08/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/95 (07-08/1995) . - p. 539-545 Titre : Storage stability of epoxy resins emulsions Type de document : texte imprimé Auteurs : Alex Wegmann, Auteur Année de publication : 1995 Article en page(s) : p. 539-545 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Emulsions -- Stabilité Epoxydes Liants Revêtements en phase aqueuse:Peinture en phase aqueuse Stabilité au stockage Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborn epoxy resin emulsions can be used for coating concrete surfaces and for anticorrosion primers on pretreated steel with excellent results. One of the limiting factors for their application is that emulsions, as metastable systems, have only a limited shelf-life. However, detailed information on the length of the shelf-life, and how it can be best determined and influenced has so far not been available. In this paper, different methods to monitor both the chemical and the physical stability of emulsions were evaluated, and their relevancy to practical applications established. The influence of parameters like the storage conditions or the structure of the epoxy resin was investigated. It is shown that stored at temperatures between 5 °C and 30 °C epoxy resin emulsions are perfectly stable for well over a year. Outside this temperature range, however, the stability declines rapidly. Practical suggestions for applicators to check the quality of emulsions are given. Note de contenu : - EXPERIMENTAL : Binders - Formulations - Storage conditions - Test procedures - RESULTS AND DISCUSSION : - General principles of emulsion physics and stability - Storage stability of epoxy resin emulsions determined by different methods (a) Macroscopic observation : sedimentation and phase separation, b) Microscopic observation : particle size of epoxy resin emulsions) - Gloss of cured paint films - Chemical stability of emulsions - Stability of emulsions against bacterial and fungal growth - Influence of the structure of the epoxy resin - Evaluation of the applied test methods. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11353 [article]

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