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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]
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
StyrèneIndex. 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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9770
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 4 (07/2010) . - p. 477-483[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012362 - Périodique Bibliothèque principale Documentaires Disponible The effect of slip agents on the characteristics and properties of epoxy-phenolic can coatings / Chao Jiang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 1 (03/2009)
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Titre : The effect of slip agents on the characteristics and properties of epoxy-phenolic can coatings Type de document : texte imprimé Auteurs : Chao Jiang, Auteur ; Peter K. T. Oldring, Auteur ; Laurence Castle, Auteur ; Paul Cooke, Auteur ; James Thomas Guthrie, Auteur Année de publication : 2009 Article en page(s) : p. 99-106 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Abrasion
Epoxydes
Mouillage (chimie des surfaces)
Phénoplastes
Revêtements -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : The migration issues associated with the transfer of chemicals from epoxy-based can coatings into foodstuffs have been studied in recent years. Slip agents are usually used in can coatings for ease of manufacture and to provide required physical resistance properties. Slip agents in epoxy-based can coatings are suspected of not only performing as lubricants but also having effects on the other properties of coatings, including their migration resistance. This article contains information relating to the evaluation of the influence of selected slip agents on the characteristics and properties of specific epoxy-phenolic can coatings. These characteristics and properties include those thermal properties of the coatings that relate to curing characteristics, the surface appearance of cured coating films, the wetting properties that may be associated with migration issues, and the abrasion properties of the cured epoxy-phenolic systems. It was found that three selected slip agents each affected the properties of the specific epoxy-phenolic can coating differently. One of three selected slip agents in particular reduced the interaction (“wettability”) of the specific coatings by test fluids and so may help to reduce chemical migration. DOI : 10.1007/s11998-008-9114-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9114-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4878
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Code-barres Cote Support Localisation Section Disponibilité 011246 - Périodique Bibliothèque principale Documentaires Disponible 011271 - Périodique Bibliothèque principale Documentaires Disponible The effect of TiO2, pigmentation on the hydrolysis of amino resin crosslinked epoxy can coatings / Saminu Musa Magami in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)
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Titre : The effect of TiO2, pigmentation on the hydrolysis of amino resin crosslinked epoxy can coatings Type de document : texte imprimé Auteurs : Saminu Musa Magami, Auteur ; Peter K. T. Oldring, Auteur ; Laurence Castle, Auteur ; James Thomas Guthrie, Auteur Année de publication : 2014 Article en page(s) : p. 1013-1022 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydrides
Can coating
Dioxyde de titane
Epoxydes
Hydrolyse
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
RéticulantsIndex. décimale : 667.9 Revêtements et enduits Résumé : Pigmented (TiO2), amino resin crosslinked coatings, designed for applications in can coatings’ internal lacquers, were formulated, characterized, applied, and cured. Three grades of a pigmentary form of TiO2 were characterized in terms of their particle size, their particle morphology, their zeta potential, and their moisture retention behavior. Epoxy coatings that were crosslinked using one of several, different amino crosslinkers were prepared. The effect of the presence of the TiO2 pigments on the hydrolysis of the cured coatings was monitored via the controlled retorting of the coatings. The different grades of TiO2 pigment were selected, to establish whether or not they could be used interchangeably with respect to hydrolysis and to melamine release. Also, the effects of the aging of the fluid coatings on the amount of melamine released from the coatings (after curing and retorting) were monitored. Storage under laboratory conditions for 2, 20, and 40 weeks was used for this purpose. The TiO2 pigment contributed significantly to the hydrolysis behavior of the epoxy coatings in that their presence substantially reduced the amount of melamine released and the extent of crosslinker hydrolysis. Typical results show that excluding the TiO2 pigment particles from the formulation results in there being 50% more hydrolysis of the crosslinker to melamine. With respect to the melamine release and crosslinker hydrolysis, the different grades of the pigment gave similar results. Note de contenu : - MATERIALS : Analysis of TiO2 - Preparation of the "model" epoxy-anhydride coatings - Coating application and curing - Surface microscopy of coatings and contact angle studies : epoxy-anhydride coatings - Retort of coatings/hydrolysis tests : epoxy-anhydride coatings - Determination of the melamine released by the epoxy-anhydride coatings
- RESULTS AND DISCUSSION : Behavior of the TiO2 pigment species - Effect of pigmentary TiO2 on the hydrolysis of cured epoxy-anhydride coatings to melamineDOI : 10.1007/s11998-014-9610-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9610-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22357
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Code-barres Cote Support Localisation Section Disponibilité 16659 - Périodique Bibliothèque principale Documentaires Disponible