Understanding BPA-non-intent resin technology in food contact metal packaging coatings / Linqian Feng in COATINGS TECH, Vol. 16, N° 6 (06/2019)  

[article]  inCOATINGS TECH > Vol. 16, N° 6 (06/2019) . - p. 28-37 Titre : Understanding BPA-non-intent resin technology in food contact metal packaging coatings Type de document : texte imprimé Auteurs : Linqian Feng, Auteur ; Andrew Detwiler, Auteur ; Jeffrey Clauson, Auteur ; Abraham Boateng, Auteur ; Hongkun He, Auteur ; Goliath Beniah, Auteur ; Thilanga Liyana Arachchi, Auteur ; H. Williams Chip, Auteur Année de publication : 2019 Article en page(s) : p. 28-37 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aliments -- Emballages Anticorrosion Bisphénol A -- Suppression ou remplacement Couches minces Emballages métalliques Essais (technologie) Essais de résilience Evaluation Formulation (Génie chimique) Résistance chimique Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Consumer and regulatory pressure to replace bisphenol-A (BPA)-based materials in food contact metal packaging coatings has increased in recent years. Regardless of the controversy around BPA, consumers expect canned foods to be free of substances perceived to have negative health impacts while maintaining current shelf life and flavor characteristics. To address the market needs, formulators must innovate to deliver BPA-non-intent (BPA-NI) solutions that can meet or exceed the performance of BPA-based materials. This presents a challenge with regard to improving the resistance to food sterilization and stability during pack testing, and simultaneously balancing mechanical performance that allows the BPA-NI coating to withstand the aggressive canning process. One response to these technical challenges has been the development of BPA-NI polyester resin technology through innovation on a monomer basis. This monomer innovation provides protective performance attributes such as resistance to corrosion and chemical attack, while enabling flexibility and adhesion through innovative resin and formulation design. Fundamental techniques such as electrochemical impedance spectroscopy (EIS) and cathodic disbonding were employed in combination with industrial fitness-for-use evaluations to demonstrate the improved protective barrier properties of novel non-BPA resins in formulated coatings. In addition, hydrophobicity and interfacial properties were studied to understand the impact of resin structure on coating performance from both experimental and computational perspectives. Applying this suite of methods and analysis builds strong structure-property correlations as part of a resin development strategy for novel non-BPA resins in metal packaging coating applications. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and sample preparation - Testing and evaluations (Electrochemical impedance spectroscopy (EIS) - Cathodic disbonding test - Food simulants and retord) - Computational modeling - RESULTS AND DISCUSSION : EIS and corrosion mechanisms - Stage zero : Dry film - Stage 1 : Foodsimulant absorption - Stage 2 : Corrosion initiation - Stage 3~4 : Pore/breakthrough formation and delamination - Time-based corrosion resistance - Interface and adhesion - Fig. 1 : Hydrolysis of model dihexanoate ester (hexanoate-glycol-hexanoate) compounds at 130°C - Fig. 2 : 2—(a) Cathodic disbonding schematic and (b) lab setup of cathodic disbonding experimental setup - Fig. 3 : Equivalent circuit model corresponding to a Bode plot with no time-constant (Stage zero corrosion) - Fig. 4 : Equivalent circuit model corresponding to one time-constant in a Bode plot (Stage I corrosion) - Fig. 5 : Equivalent circuit model corresponding to two time-constant (Stage II corrosion) - Fig. 6 : Equivalent circuit model corresponding to a coated metal with Warburg character (Stage III ∼ IV corrosion). Schematics (a) and (b) correspond to equations (5) and (6), respectively - Fig. 7 : Effect of exposure time on the EIS Bode plot for low-Tg low Mn Control B based clear PU - Fig. 8 : EIS Bode plot to compare Resin A vs Control A in clear PU formulation, as well as Resin A in gold benzoguanamine phenolic after 5 h of exposure in LAS food simulant - Fig. 9 : ime-based corrosion resistance of white PU coatings formulated with Control A, Control B, Resin A, and Resin B resins in 2% lactic acid food simulant for (a) 1st 48-h interval and (b) 2nd 48-h interval. Ten hours of relaxation time was given before the 1st and 2nd test intervals. Corrosion resistance is identified by the impedance value at 0.1 Hz - Fig. 10 : A comparison of corrosion resistance of white PU coatings formulated with Control A, Control B, Resin A, and Resin B resins after 106 h, in 2% lactic acid food simulant -Fig. 11 : (a) LogP values calculated for glycol (G1)-terephthalic acid (T)-glycol (G2) trimer model compounds, where EG=ethylene glycol, BG=butylene glycol, PG=propylene glycol, NPG=neopentyl glycol, DG=diethylene glycol. (b) Hildebrand solubility parameters calculated from molecular dynamics simulations. The color codes are used to rate the values, where Green=smallest value and Red=greatest value - Fig. 12 : EIS bode plot to compare Resin A vs Control A in clear PU formulation after 12 days of exposure in LAS food simulant - Fig. 13 : Images of clear PU coatings formulated with Resin A and Control A (a) after 3% acetic acid retort and (b) after cathodic disbonding test whereby 5V was applied for 60 sec - Fig. 14 : Quantifying cathodic disbonding failures of Control A-based clear PU coatings through pixels counting - Table 1 : Details of BPA-NI polyestser resins utilized in this study - Table 2 : Details of formulation components utilized in this study - Table 3 : Formulation details of gold benzoguanamine phenolic formulation - Table 4 : Formulation details of white and clear PU formulations En ligne : https://drive.google.com/file/d/1GM1X2P5qhHB9ENgQzeyxlyuJg2J5yzEO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32719 [article]

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