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Extent of solvents and chemical oxygen demand build-up in boothwater systems using waterborne paint / Sheila F. Kia in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 861 (10/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 861 (10/1996) . - p. 87-95 Titre : Extent of solvents and chemical oxygen demand build-up in boothwater systems using waterborne paint Type de document : texte imprimé Auteurs : Sheila F. Kia, Auteur ; Devi N. Rai, Auteur ; Ronald L. Williams, Auteur Année de publication : 1996 Article en page(s) : p. 87-95 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ateliers de peinture industrielle Composés organiques volatils Eaux usées Revêtements Revêtements en phase aqueuse:Peinture en phase aqueuse Solvants organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The real-time impact of waterborne paint for basecoat on the spray boothwater system was investigated by monitoring the paint spray systems at five automotive assembly plants for periods up to 555 days. The laboratory analyses of the boothwater samples were aimed at evaluating the extent of accumulation of organic material in boothwater. Among the five systems studied, the boothwater average total organic content in terms of chemical oxygen demand (COD) spanned from 3,300 to 16,400 ppm. For systems with a low boothwater replenishment rate and clean water start-up, the boothwater COD showed an almost linear increase with time. Among the systems, the boothwater contained less than 1,000 ppm organic solvents. The boothwater solvents originate primarily from the paint; the contribution from purge and the cleaning chemicals is small. For all the systems, the solvents in boothwater account for less than 26% of the boothwater COD. The balance of COD us contributed by nonvolatile organics such as paint resins and the organic polymers from the treatment chemicals, which are present in boothwater as fine particles (<0.45μm). Note de contenu : - EXPERIMENTAL : Boothwater systems and paints - Boothwater sampling & analysis methods - RESULTS : Individual solvents in boothwater - Total solvents in boothwater - COD & dissolved solids in boothwater - Reasons for the variability in boothwater composition Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18445 [article]

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Dielectric and thermal analysis of the film formation of a polymer latex / John W. Schultz in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 861 (10/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 861 (10/1996) . - p. 97-106 Titre : Dielectric and thermal analysis of the film formation of a polymer latex Type de document : texte imprimé Auteurs : John W. Schultz, Auteur ; Richard P. Chartoff, Auteur Année de publication : 1996 Article en page(s) : p. 97-106 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Cinétique chimique Cires Diélectriques Formation de film Latex Produits nettoyants Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : The real-time kinetics of film formation of a floor polish polymer latex coating has been investigated using dielectric measurements of the ionic conductance. Varying levels of ambient humidity were applied and had a dramatic effect on the drying rate, drying mechanism, and final film thermal and mechanical properties. At humidities below 30%, the drying curves followed a power law time decay with two distinguishable regions. The first region showed a drying rate dependence on the order of t^-10, while the second region showed a drying rate dependence on the order of t^-2. At higher humidities, the curves become more complex. At the highest humidities, film cracking was observed. Besides dielectric analysis, thermal analysis experiments were conducted that indicated film formation continues over very long times (months). The data also indicate that considerable residual stress remains in the dried films even after these long times. Note de contenu : - INTRODUCTION : Latex emulsions and floor polish - Latex coalescence - Measurements techniques - EXPERIMENTAL : Material formulation - Dielectric apparatus - Thermal analysis measurements - RESULTS AND DISCUSSION : Dielectric measurements - Thermal analysis measurements Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18446 [article]

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Rheology of acrylic powder coatings / S. G. Yeates in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 861 (10/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 861 (10/1996) . - p. 107-114 Titre : Rheology of acrylic powder coatings Type de document : texte imprimé Auteurs : S. G. Yeates, Auteur ; T. Annable, Auteur ; B. J. Denton, Auteur ; G. Ellis, Auteur ; R. M. D. Nasir, Auteur ; D. Perito, Auteur ; I. Parker, Auteur Année de publication : 1996 Article en page(s) : p. 107-114 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymères Modèles mathématiques Polyacryliques Réticulation (polymérisation) Revêtements poudre:Peinture poudre Rhéologie Thermodurcissables Index. décimale : 667.9 Revêtements et enduits Résumé : Flexibility in the functional design of acrylic powder coatings has enabled a wide range of different crosslinking chemistries to be developed, based upon carboxyl, hydroxyl, and glycidyl functional binders. The use of dynamic viscosity/time (temperature) cure curves is seen as a powerful technique to quantify formulation and resin design parameters. This paper describes how the technique can be used to highlight differences in the available crosslinking chemistries and begins to show how this can be used to predict coating performance on a more quantitative level. A simple model describing the viscosity changes during the curing process is presented, which shows good qualitative agreement with the experimental results. Note de contenu : - INTRODUCTION : Crosslinking chemistries - Chemorheology - EXPERIMENTAL : Acrylic copolymers - Powder paint formulation - Rheology - Modeling - RESULTS AND DISCUSSION : Acid functional acrylics - Comparison of different functional types - Modeling Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18447 [article]

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Using LCA to select coatings for optimum environmental and cost performance / Nick J. Hazel in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 861 (10/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 861 (10/1996) . - p. 117-121 Titre : Using LCA to select coatings for optimum environmental and cost performance Type de document : texte imprimé Auteurs : Nick J. Hazel, Auteur Année de publication : 1996 Article en page(s) : p. 117-121 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coût de production Durée de vie (Ingénierie) Environnement -- Protection Pollution -- Lutte contre Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Coating systems are very complex and LCA studies require careful setting up. Definition of the functional unit in terms of articles or coated area, with statements on performance (including durability) is necessary. - A system approach is preferred, which takes account of multiple coats, and pre and post treatments (e.g., in service replacement/repair). - A fair basis for comparison is needed for a credible study, attention must be given to data quality issues. - Emissions are best grouped according to major contributory cause (sub-system/process). - Where trade-offs are identified, emission control options are difficult to justify and need to be approached with caution. - Steps taken to reduce certain emissions will not increase others, E.g., containment ; these changes are easy to justify. - Environmental burdens from high-solids and wtaer based coatings tend to converge as solids levels increase, differences become less significant. - Cost benefit analysis indicates that high solids systems should be seen as an end-point technology, not as a stop-gap. Note de contenu : - INTRODUCTION : Performance - Economics - Environmental - LIFE CYCLE ASSESSMENT (LCA) : Methodology - SCOPE : Systems - Dta sources and quality - BASIS FOR COMPARISONS : Functional unit - Performance matching - State of the art - ANALYSIS : Environmentally based performance criteria - Environmental convergence Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18448 [article]

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