De l’étude des paramètres physico-mécaniques des revêtements vers le développement de finitions performantes sur bois en extérieur

Abstract : Wood used outdoors is subject to aesthetic damages and to dimensional variations due to alternation of dry and wet periods. Therefore, a protection with a coating is recommended. Coatings need to be soft enough to follow variations of wood and at the same time hard enough to be able to withstand possible damages (impact). Hence, mechanical properties of coatings play a major role in their service life. However in Europe, coating performances are mainly assessed through weathering tests followed by visual assessments, color and gloss measurements and adherence tests. The aim of this work is to develop a thorough methodology to assess coating performances in order to better understand the resistance of coatings to weathering. The final objective of this project is an industrial development of innovating wood coatings for outdoors with good performances to weathering during their service life. Through our study, performances of commercial coating were assessed using conventional standardized tests from the EN 927 series but also with other methods in order to gain an extensive understanding of their physic-mechanical properties. Hence, damping and indentation tests on coated wood were investigated as well as tensile tests on free films. Persoz pendulum was particularly used as a tool to approach easily and quickly mechanical properties of coatings. This work established a link between damping test results and coating performances exposed to artificial and natural weathering. Tensile tests on free films have supported these results as a good correlation between damping hardness and some mechanical properties was found. Last but not least, the analysis of damping hardness variations versus weathering time has lead to a better understanding in the development of damages and to the establishment of performance specifications. These results allowed us to select and formulate new UV-curing formulations for outdoors. They are made of a mixture of monomers and oligomers combined with photoinitiators. At this stage, the methodology developed to assess performances has allowed the selection of the best constituents to ensure good performances to weathering
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https://hal.univ-lorraine.fr/tel-01754619
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Submitted on : Friday, March 30, 2018 - 9:55:14 AM
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  • HAL Id : tel-01754619, version 1

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Lise Malassenet. De l’étude des paramètres physico-mécaniques des revêtements vers le développement de finitions performantes sur bois en extérieur. Architecture, aménagement de l'espace. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0204⟩. ⟨tel-01754619⟩

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