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Étude de la mise au point d'un vernis industriel à base de colophane et d'huile végétale

Abstract : The aim of this project is to study the development of an industrial varnish with rosin and vegetal oil. The objective is to develop the uses of maritime pine rosin in order to make a varnish based on antique knowledge (Tirat 2016). The varnish used at the end of the XVIIe and at the beginning of the XVIIIe century by the violinmaker Antonio Stradivari get our attention. It has an exceptional quality and was made with a mixture of rosin and linseed oil (Echard 2010). On this knowledge basis, we would like to produce an industrialized biobased varnish with high performance. This work is part of the collaborative project Stradivarius, labelled Xylofutur, which associate the University of Pau and Adour region, the “Cité de la musique” (Paris), the FCBA (Bordeaux), Créteil university, Concept Aquitaine (Bordeaux), Finsa (Morcenx), Biogemme-Holiste (Biscarosse), Meubles Goisnard (Belin-Beliet) and the association Api’Up (Capbreton).The raw materials are linseed oil (Onyx) and maritime pine rosin colophony from Biscarosse (Holiste). After resin drying between 120°C and 180°C, the residual turpentine in the rosin were analyzed with a thermogravimetric analyzer (TGA). The oils and rosins are heat treated with a stirring hot plate and the real temperature was obtained with a thermocouple.Then, various varnishes were formulated with linseed oil, colophony and additives thanks to a stirring hot plate. They were applied with a brush and polymerized with UVA lamps. The film colors were measured with a spectrophotometer (Ci62, X-rite). The brightness was measured using a gloss meters (micro-gloss, BYK Gardner). Adhesion test was performed using a pull-off adhesion tester (TA, Positest).The analysis were realised using the following devices : thermomechanical analysis (, Mettler Toledo), thermogravimetric Analysis (TGA Q500, TA instruments), high-performance liquid chromatography (Ultimate 3000, Thermo Scientific), differential scanning calorimetry (DSC Q20, TA instruments) and an electrospray hybrid linear ion Orbitap mass analyzer (LTQ Orbitrap Velos, Thermo-Fisher).The experiments have been carried on three axes :-Heat treatment on linseed oil and the influences on the varnish. Five treatments have been tested : raw oil, two heat treatments lower than 200°C, a flushing with water before a heat treatment lower than 200°C, and a standolization at 400°C under nitrogen.-Heat treatment on rosin and the influences on the varnish. Four treatments have been tested : raw rosin, and three heat treatments, 180°C, 200°C and 250°C during 30 minutes.-Addition of minerals additives and their influences on the curing and the quality of the varnish.The heat treatments on both linseed oil and rosin seems to have an influence on the varnish quality, especially on its brightness and its solvent resistance. The addition of additives considerably improve the curing time and the varnish quality. A know-how deposit is in progress for this formulation with additives.
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Manon Francès. Étude de la mise au point d'un vernis industriel à base de colophane et d'huile végétale. Polymères. Université de Pau et des Pays de l'Adour, 2019. Français. ⟨NNT : 2019PAUU3045⟩. ⟨tel-02873442⟩

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