Laboratory studies into how glass-reinforced plastic (GRP) vat surfaces can be repaired without causing migration of styrene into foodstuffs / Emma L. Bradley in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 4 (07/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 4 (07/2010) . - p. 477-483 Titre : Laboratory studies into how glass-reinforced plastic (GRP) vat surfaces can be repaired without causing migration of styrene into foodstuffs Type de document : texte imprimé Auteurs : Emma L. Bradley, Auteur ; Laurence Castle, Auteur ; Andrew P. Damant, Auteur ; Sue M. Jickells, Auteur ; Mark R. Philo, Auteur Année de publication : 2010 Article en page(s) : p. 477-483 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de verre Contamination chimique Industries agroalimentaires -- Appareils et matériel -- Entretien et réparation Polymères dans les industries agro-alimentaires Récipients Revêtements -- Entretien et réparations Styrène Index. décimale : 667.9 Revêtements et enduits Résumé : Glass–fiber-reinforced plastic (GRP) vats are used widely for the storage of foodstuffs and potable water. As the inner surfaces deteriorate during decades of use, they need to be repaired. The unsaturated polyester resins that are used for recoating are crosslinked with styrene which can cause taint and odor problems. This article describes some coating parameters that affect the content of residual styrene and its subsequent migration. The influences of cure temperature and duration, along with the effect of washing with warm detergent solution, were investigated. Cured specimens were tested for their residual styrene content and for styrene migration into the food simulants, distilled water, 3% acetic acid, and 15% ethanol. The dominant factor in reducing the amount of residual styrene is the temperature. The resin self-heats as it cures, typically up to 50°C. Thus, any further lowering of the styrene content requires a higher cure temperature than this. A 3-h cure at 80°C reduced both the residual content and the migration levels by about 100-fold. At lower cure temperatures, the heating effect of washing at 60°C is more important than the washing effect of the detergent. When less catalyst was used the residual styrene levels rose dramatically, from 70 to 360 to 1300 mg/kg for the normal dose, half and quarter the normal dose, respectively. There was a linear relationship between residual content in the GRP and the migration levels. This correlation could be used for monitoring the quality of vats repaired in situ, using styrene-based coating resins. Note de contenu : - METHODS : Plaque preparation - Determination of residual styrene - Single-sided migration testing - RESULTS AND DISCUSSION : Analytical performance - Plaque homogeneity results - Styrene content in cured plaques - The choice of appropriate food simulants for migration testing - Styrene migration - Effect of varying the catalyst content - Relationship between styrene content and migration. DOI : 10.1007/s11998-009-9212-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9212-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9770 [article]

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