Antistatic properties of clearcoats by the use of special additives / Carina Deschamps in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 3 (05-06/2020) . - p. 693-710 Titre : Antistatic properties of clearcoats by the use of special additives Type de document : texte imprimé Auteurs : Carina Deschamps, Auteur ; Neil Simpson, Auteur ; Michael Dornbusch, Auteur Année de publication : 2020 Article en page(s) : p. 693-710 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antistatiques Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Réticulation (polymérisation) Revêtements -- Séchage sous rayonnement ultraviolet Sels d'ammonium Spectrométrie infrarouge Vernis -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Electrostatic discharge and dust attraction are everyday life phenomenon, which are undesirable in most cases. In coatings, antistatic additives can solve this issue by reducing the surface resistance of surfaces. By way of formulation, antistatic coatings might prevent electrostatic discharge and dust attraction. In this work, we evaluated different substances to investigate and understand their ability to create an antistatic effect, specifically in a UV clearcoat. We have developed a method to evaluate the suitability of antistatic additives by investigating their location within the coating matrix by FTIR, versus the location of the coating resistance and resultant coating performance. We compared an array of different chemistries used to impart antistatic effects, from classic quaternary salts to polymeric materials and pigments, to better understand how they perform in a coating and to understand any benefits or issues. All additives helped to reduce surface resistance and therefore improve the potential for antistatic performance. We found the most powerful effects on reduced resistance from the ionic liquid and conducting pigment, but they were unable to target the surface where the effect was needed for an antistatic behavior. Additives at the surface gave the strongest effect, but they mostly relied upon increasing hydrophilicity and as a result reduced coating hardness and tended to leach from the coating. Modifying the quats (quaternary ammonium cationic materials) with PDMS (polydimethylsiloxane) gave the strongest surface affinity, but we believe this diluted the effect of antistatic behavior versus lower molecular analogues due to the lower molar concentration of active groups. We believe our work could be used by formulators to better design additives that find the correct location within a coating to avoid waste and side effects, and to address the issue of permanence through crosslinkable modification. Note de contenu : - INTRODUCTION : Absorption mechanism - Network mechanism - Methods and materials - Analytical measurement details - Coating and application details - Antistatic additive details - RESULTS AND DISCUSSION : Optimizing the cure conditions - UV monomer conversion with additives - Location of the additives in the cured coating - Surface and vertical resistance of the coatingwith additives - UV monomer conversion with additives - Location of the additives in the cured coating - Surface and vertical resistance of the coating with additives - Durability of the resistance - Coating properties with additives DOI : https://doi.org/10.1007/s11998-019-00283-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00283-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34100 [article]

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