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Adhésion et adhérence entre les peintures automobiles et des adhésifs sensibles à la pression : influence du nettoyage sur la physico-chimie et la tenue mécanique des interfaces

Abstract : Automotive topcoats are constituted of basecoat/clearcoat system or lacquer. Analyses of their outermost surface point out that polysiloxane additives are detected on the clearcoats and oxygenated compounds are detected on the lacquer, these compounds cover partially the polyacrylate-polyurethane network. The segregation of siloxane additives to the clearcoat surface decrease the adhesion of pressure-sensitive adhesives. The slight adhesion is explained by calculation of solubility parameters : the interaction between siloxane additives and PSA is lower than the interaction between polyacrylate network and adhesive. Analyses point out that an ethanol cleaning can remove additives from the topcoat surface and improve considerably adhesion to clearcoats. Moreover, this study characterizes the mechanical behaviours of two PSA families, which are composed of elastomer or acrylic copolymers. The local peel strength is correlated to the adhesive deformation. The majority of peel strength is dissipated when elongation is maximum. Adhesives behaviours depend on the composition (elastomer or acrylic) and peel strength is proportional to the contact area with the substrate.
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Submitted on : Thursday, December 31, 2009 - 11:10:40 AM
Last modification on : Wednesday, October 14, 2020 - 4:02:43 AM
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  • HAL Id : tel-00443608, version 1

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Matthieu Horgnies. Adhésion et adhérence entre les peintures automobiles et des adhésifs sensibles à la pression : influence du nettoyage sur la physico-chimie et la tenue mécanique des interfaces. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2004. Français. ⟨NNT : 2004ENMP1169⟩. ⟨tel-00443608⟩

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